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-rw-r--r--drivers/Kconfig4
-rw-r--r--drivers/Makefile2
-rw-r--r--drivers/remoteproc/Kconfig28
-rw-r--r--drivers/remoteproc/Makefile9
-rw-r--r--drivers/remoteproc/omap_remoteproc.c229
-rw-r--r--drivers/remoteproc/omap_remoteproc.h69
-rw-r--r--drivers/remoteproc/remoteproc_core.c1586
-rw-r--r--drivers/remoteproc/remoteproc_debugfs.c179
-rw-r--r--drivers/remoteproc/remoteproc_internal.h44
-rw-r--r--drivers/remoteproc/remoteproc_virtio.c289
-rw-r--r--drivers/rpmsg/Kconfig10
-rw-r--r--drivers/rpmsg/Makefile1
-rw-r--r--drivers/rpmsg/virtio_rpmsg_bus.c1054
13 files changed, 3504 insertions, 0 deletions
diff --git a/drivers/Kconfig b/drivers/Kconfig
index decf8e420856..6f0459cb745b 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -130,6 +130,10 @@ source "drivers/clocksource/Kconfig"
source "drivers/iommu/Kconfig"
+source "drivers/remoteproc/Kconfig"
+
+source "drivers/rpmsg/Kconfig"
+
source "drivers/virt/Kconfig"
source "drivers/devfreq/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 932e8bf20356..262b19d6b627 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -125,6 +125,8 @@ obj-y += clk/
obj-$(CONFIG_HWSPINLOCK) += hwspinlock/
obj-$(CONFIG_NFC) += nfc/
obj-$(CONFIG_IOMMU_SUPPORT) += iommu/
+obj-$(CONFIG_REMOTEPROC) += remoteproc/
+obj-$(CONFIG_RPMSG) += rpmsg/
# Virtualization drivers
obj-$(CONFIG_VIRT_DRIVERS) += virt/
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
new file mode 100644
index 000000000000..24d880e78ec6
--- /dev/null
+++ b/drivers/remoteproc/Kconfig
@@ -0,0 +1,28 @@
+menu "Remoteproc drivers (EXPERIMENTAL)"
+
+# REMOTEPROC gets selected by whoever wants it
+config REMOTEPROC
+ tristate
+ depends on EXPERIMENTAL
+
+config OMAP_REMOTEPROC
+ tristate "OMAP remoteproc support"
+ depends on ARCH_OMAP4
+ depends on OMAP_IOMMU
+ select REMOTEPROC
+ select OMAP_MBOX_FWK
+ select RPMSG
+ help
+ Say y here to support OMAP's remote processors (dual M3
+ and DSP on OMAP4) via the remote processor framework.
+
+ Currently only supported on OMAP4.
+
+ Usually you want to say y here, in order to enable multimedia
+ use-cases to run on your platform (multimedia codecs are
+ offloaded to remote DSP processors using this framework).
+
+ It's safe to say n here if you're not interested in multimedia
+ offloading or just want a bare minimum kernel.
+
+endmenu
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
new file mode 100644
index 000000000000..5445d9b23294
--- /dev/null
+++ b/drivers/remoteproc/Makefile
@@ -0,0 +1,9 @@
+#
+# Generic framework for controlling remote processors
+#
+
+obj-$(CONFIG_REMOTEPROC) += remoteproc.o
+remoteproc-y := remoteproc_core.o
+remoteproc-y += remoteproc_debugfs.o
+remoteproc-y += remoteproc_virtio.o
+obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
diff --git a/drivers/remoteproc/omap_remoteproc.c b/drivers/remoteproc/omap_remoteproc.c
new file mode 100644
index 000000000000..69425c4e86f3
--- /dev/null
+++ b/drivers/remoteproc/omap_remoteproc.c
@@ -0,0 +1,229 @@
+/*
+ * OMAP Remote Processor driver
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ * Fernando Guzman Lugo <fernando.lugo@ti.com>
+ * Mark Grosen <mgrosen@ti.com>
+ * Suman Anna <s-anna@ti.com>
+ * Hari Kanigeri <h-kanigeri2@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/remoteproc.h>
+
+#include <plat/mailbox.h>
+#include <plat/remoteproc.h>
+
+#include "omap_remoteproc.h"
+#include "remoteproc_internal.h"
+
+/**
+ * struct omap_rproc - omap remote processor state
+ * @mbox: omap mailbox handle
+ * @nb: notifier block that will be invoked on inbound mailbox messages
+ * @rproc: rproc handle
+ */
+struct omap_rproc {
+ struct omap_mbox *mbox;
+ struct notifier_block nb;
+ struct rproc *rproc;
+};
+
+/**
+ * omap_rproc_mbox_callback() - inbound mailbox message handler
+ * @this: notifier block
+ * @index: unused
+ * @data: mailbox payload
+ *
+ * This handler is invoked by omap's mailbox driver whenever a mailbox
+ * message is received. Usually, the mailbox payload simply contains
+ * the index of the virtqueue that is kicked by the remote processor,
+ * and we let remoteproc core handle it.
+ *
+ * In addition to virtqueue indices, we also have some out-of-band values
+ * that indicates different events. Those values are deliberately very
+ * big so they don't coincide with virtqueue indices.
+ */
+static int omap_rproc_mbox_callback(struct notifier_block *this,
+ unsigned long index, void *data)
+{
+ mbox_msg_t msg = (mbox_msg_t) data;
+ struct omap_rproc *oproc = container_of(this, struct omap_rproc, nb);
+ struct device *dev = oproc->rproc->dev;
+ const char *name = oproc->rproc->name;
+
+ dev_dbg(dev, "mbox msg: 0x%x\n", msg);
+
+ switch (msg) {
+ case RP_MBOX_CRASH:
+ /* just log this for now. later, we'll also do recovery */
+ dev_err(dev, "omap rproc %s crashed\n", name);
+ break;
+ case RP_MBOX_ECHO_REPLY:
+ dev_info(dev, "received echo reply from %s\n", name);
+ break;
+ default:
+ /* msg contains the index of the triggered vring */
+ if (rproc_vq_interrupt(oproc->rproc, msg) == IRQ_NONE)
+ dev_dbg(dev, "no message was found in vqid %d\n", msg);
+ }
+
+ return NOTIFY_DONE;
+}
+
+/* kick a virtqueue */
+static void omap_rproc_kick(struct rproc *rproc, int vqid)
+{
+ struct omap_rproc *oproc = rproc->priv;
+ int ret;
+
+ /* send the index of the triggered virtqueue in the mailbox payload */
+ ret = omap_mbox_msg_send(oproc->mbox, vqid);
+ if (ret)
+ dev_err(rproc->dev, "omap_mbox_msg_send failed: %d\n", ret);
+}
+
+/*
+ * Power up the remote processor.
+ *
+ * This function will be invoked only after the firmware for this rproc
+ * was loaded, parsed successfully, and all of its resource requirements
+ * were met.
+ */
+static int omap_rproc_start(struct rproc *rproc)
+{
+ struct omap_rproc *oproc = rproc->priv;
+ struct platform_device *pdev = to_platform_device(rproc->dev);
+ struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
+ int ret;
+
+ oproc->nb.notifier_call = omap_rproc_mbox_callback;
+
+ /* every omap rproc is assigned a mailbox instance for messaging */
+ oproc->mbox = omap_mbox_get(pdata->mbox_name, &oproc->nb);
+ if (IS_ERR(oproc->mbox)) {
+ ret = PTR_ERR(oproc->mbox);
+ dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Ping the remote processor. this is only for sanity-sake;
+ * there is no functional effect whatsoever.
+ *
+ * Note that the reply will _not_ arrive immediately: this message
+ * will wait in the mailbox fifo until the remote processor is booted.
+ */
+ ret = omap_mbox_msg_send(oproc->mbox, RP_MBOX_ECHO_REQUEST);
+ if (ret) {
+ dev_err(rproc->dev, "omap_mbox_get failed: %d\n", ret);
+ goto put_mbox;
+ }
+
+ ret = pdata->device_enable(pdev);
+ if (ret) {
+ dev_err(rproc->dev, "omap_device_enable failed: %d\n", ret);
+ goto put_mbox;
+ }
+
+ return 0;
+
+put_mbox:
+ omap_mbox_put(oproc->mbox, &oproc->nb);
+ return ret;
+}
+
+/* power off the remote processor */
+static int omap_rproc_stop(struct rproc *rproc)
+{
+ struct platform_device *pdev = to_platform_device(rproc->dev);
+ struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
+ struct omap_rproc *oproc = rproc->priv;
+ int ret;
+
+ ret = pdata->device_shutdown(pdev);
+ if (ret)
+ return ret;
+
+ omap_mbox_put(oproc->mbox, &oproc->nb);
+
+ return 0;
+}
+
+static struct rproc_ops omap_rproc_ops = {
+ .start = omap_rproc_start,
+ .stop = omap_rproc_stop,
+ .kick = omap_rproc_kick,
+};
+
+static int __devinit omap_rproc_probe(struct platform_device *pdev)
+{
+ struct omap_rproc_pdata *pdata = pdev->dev.platform_data;
+ struct omap_rproc *oproc;
+ struct rproc *rproc;
+ int ret;
+
+ ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
+ if (ret) {
+ dev_err(pdev->dev.parent, "dma_set_coherent_mask: %d\n", ret);
+ return ret;
+ }
+
+ rproc = rproc_alloc(&pdev->dev, pdata->name, &omap_rproc_ops,
+ pdata->firmware, sizeof(*oproc));
+ if (!rproc)
+ return -ENOMEM;
+
+ oproc = rproc->priv;
+ oproc->rproc = rproc;
+
+ platform_set_drvdata(pdev, rproc);
+
+ ret = rproc_register(rproc);
+ if (ret)
+ goto free_rproc;
+
+ return 0;
+
+free_rproc:
+ rproc_free(rproc);
+ return ret;
+}
+
+static int __devexit omap_rproc_remove(struct platform_device *pdev)
+{
+ struct rproc *rproc = platform_get_drvdata(pdev);
+
+ return rproc_unregister(rproc);
+}
+
+static struct platform_driver omap_rproc_driver = {
+ .probe = omap_rproc_probe,
+ .remove = __devexit_p(omap_rproc_remove),
+ .driver = {
+ .name = "omap-rproc",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(omap_rproc_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("OMAP Remote Processor control driver");
diff --git a/drivers/remoteproc/omap_remoteproc.h b/drivers/remoteproc/omap_remoteproc.h
new file mode 100644
index 000000000000..f6d2036d383d
--- /dev/null
+++ b/drivers/remoteproc/omap_remoteproc.h
@@ -0,0 +1,69 @@
+/*
+ * Remote processor messaging
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name Texas Instruments nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _OMAP_RPMSG_H
+#define _OMAP_RPMSG_H
+
+/*
+ * enum - Predefined Mailbox Messages
+ *
+ * @RP_MBOX_READY: informs the M3's that we're up and running. this is
+ * part of the init sequence sent that the M3 expects to see immediately
+ * after it is booted.
+ *
+ * @RP_MBOX_PENDING_MSG: informs the receiver that there is an inbound
+ * message waiting in its own receive-side vring. please note that currently
+ * this message is optional: alternatively, one can explicitly send the index
+ * of the triggered virtqueue itself. the preferred approach will be decided
+ * as we progress and experiment with those two different approaches.
+ *
+ * @RP_MBOX_CRASH: this message is sent if BIOS crashes
+ *
+ * @RP_MBOX_ECHO_REQUEST: a mailbox-level "ping" message.
+ *
+ * @RP_MBOX_ECHO_REPLY: a mailbox-level reply to a "ping"
+ *
+ * @RP_MBOX_ABORT_REQUEST: a "please crash" request, used for testing the
+ * recovery mechanism (to some extent).
+ */
+enum omap_rp_mbox_messages {
+ RP_MBOX_READY = 0xFFFFFF00,
+ RP_MBOX_PENDING_MSG = 0xFFFFFF01,
+ RP_MBOX_CRASH = 0xFFFFFF02,
+ RP_MBOX_ECHO_REQUEST = 0xFFFFFF03,
+ RP_MBOX_ECHO_REPLY = 0xFFFFFF04,
+ RP_MBOX_ABORT_REQUEST = 0xFFFFFF05,
+};
+
+#endif /* _OMAP_RPMSG_H */
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
new file mode 100644
index 000000000000..ee15c68fb519
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -0,0 +1,1586 @@
+/*
+ * Remote Processor Framework
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ * Mark Grosen <mgrosen@ti.com>
+ * Fernando Guzman Lugo <fernando.lugo@ti.com>
+ * Suman Anna <s-anna@ti.com>
+ * Robert Tivy <rtivy@ti.com>
+ * Armando Uribe De Leon <x0095078@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/slab.h>
+#include <linux/mutex.h>
+#include <linux/dma-mapping.h>
+#include <linux/firmware.h>
+#include <linux/string.h>
+#include <linux/debugfs.h>
+#include <linux/remoteproc.h>
+#include <linux/iommu.h>
+#include <linux/klist.h>
+#include <linux/elf.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_ring.h>
+#include <asm/byteorder.h>
+
+#include "remoteproc_internal.h"
+
+static void klist_rproc_get(struct klist_node *n);
+static void klist_rproc_put(struct klist_node *n);
+
+/*
+ * klist of the available remote processors.
+ *
+ * We need this in order to support name-based lookups (needed by the
+ * rproc_get_by_name()).
+ *
+ * That said, we don't use rproc_get_by_name() at this point.
+ * The use cases that do require its existence should be
+ * scrutinized, and hopefully migrated to rproc_boot() using device-based
+ * binding.
+ *
+ * If/when this materializes, we could drop the klist (and the by_name
+ * API).
+ */
+static DEFINE_KLIST(rprocs, klist_rproc_get, klist_rproc_put);
+
+typedef int (*rproc_handle_resources_t)(struct rproc *rproc,
+ struct resource_table *table, int len);
+typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail);
+
+/*
+ * This is the IOMMU fault handler we register with the IOMMU API
+ * (when relevant; not all remote processors access memory through
+ * an IOMMU).
+ *
+ * IOMMU core will invoke this handler whenever the remote processor
+ * will try to access an unmapped device address.
+ *
+ * Currently this is mostly a stub, but it will be later used to trigger
+ * the recovery of the remote processor.
+ */
+static int rproc_iommu_fault(struct iommu_domain *domain, struct device *dev,
+ unsigned long iova, int flags)
+{
+ dev_err(dev, "iommu fault: da 0x%lx flags 0x%x\n", iova, flags);
+
+ /*
+ * Let the iommu core know we're not really handling this fault;
+ * we just plan to use this as a recovery trigger.
+ */
+ return -ENOSYS;
+}
+
+static int rproc_enable_iommu(struct rproc *rproc)
+{
+ struct iommu_domain *domain;
+ struct device *dev = rproc->dev;
+ int ret;
+
+ /*
+ * We currently use iommu_present() to decide if an IOMMU
+ * setup is needed.
+ *
+ * This works for simple cases, but will easily fail with
+ * platforms that do have an IOMMU, but not for this specific
+ * rproc.
+ *
+ * This will be easily solved by introducing hw capabilities
+ * that will be set by the remoteproc driver.
+ */
+ if (!iommu_present(dev->bus)) {
+ dev_dbg(dev, "iommu not found\n");
+ return 0;
+ }
+
+ domain = iommu_domain_alloc(dev->bus);
+ if (!domain) {
+ dev_err(dev, "can't alloc iommu domain\n");
+ return -ENOMEM;
+ }
+
+ iommu_set_fault_handler(domain, rproc_iommu_fault);
+
+ ret = iommu_attach_device(domain, dev);
+ if (ret) {
+ dev_err(dev, "can't attach iommu device: %d\n", ret);
+ goto free_domain;
+ }
+
+ rproc->domain = domain;
+
+ return 0;
+
+free_domain:
+ iommu_domain_free(domain);
+ return ret;
+}
+
+static void rproc_disable_iommu(struct rproc *rproc)
+{
+ struct iommu_domain *domain = rproc->domain;
+ struct device *dev = rproc->dev;
+
+ if (!domain)
+ return;
+
+ iommu_detach_device(domain, dev);
+ iommu_domain_free(domain);
+
+ return;
+}
+
+/*
+ * Some remote processors will ask us to allocate them physically contiguous
+ * memory regions (which we call "carveouts"), and map them to specific
+ * device addresses (which are hardcoded in the firmware).
+ *
+ * They may then ask us to copy objects into specific device addresses (e.g.
+ * code/data sections) or expose us certain symbols in other device address
+ * (e.g. their trace buffer).
+ *
+ * This function is an internal helper with which we can go over the allocated
+ * carveouts and translate specific device address to kernel virtual addresses
+ * so we can access the referenced memory.
+ *
+ * Note: phys_to_virt(iommu_iova_to_phys(rproc->domain, da)) will work too,
+ * but only on kernel direct mapped RAM memory. Instead, we're just using
+ * here the output of the DMA API, which should be more correct.
+ */
+static void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+ struct rproc_mem_entry *carveout;
+ void *ptr = NULL;
+
+ list_for_each_entry(carveout, &rproc->carveouts, node) {
+ int offset = da - carveout->da;
+
+ /* try next carveout if da is too small */
+ if (offset < 0)
+ continue;
+
+ /* try next carveout if da is too large */
+ if (offset + len > carveout->len)
+ continue;
+
+ ptr = carveout->va + offset;
+
+ break;
+ }
+
+ return ptr;
+}
+
+/**
+ * rproc_load_segments() - load firmware segments to memory
+ * @rproc: remote processor which will be booted using these fw segments
+ * @elf_data: the content of the ELF firmware image
+ * @len: firmware size (in bytes)
+ *
+ * This function loads the firmware segments to memory, where the remote
+ * processor expects them.
+ *
+ * Some remote processors will expect their code and data to be placed
+ * in specific device addresses, and can't have them dynamically assigned.
+ *
+ * We currently support only those kind of remote processors, and expect
+ * the program header's paddr member to contain those addresses. We then go
+ * through the physically contiguous "carveout" memory regions which we
+ * allocated (and mapped) earlier on behalf of the remote processor,
+ * and "translate" device address to kernel addresses, so we can copy the
+ * segments where they are expected.
+ *
+ * Currently we only support remote processors that required carveout
+ * allocations and got them mapped onto their iommus. Some processors
+ * might be different: they might not have iommus, and would prefer to
+ * directly allocate memory for every segment/resource. This is not yet
+ * supported, though.
+ */
+static int
+rproc_load_segments(struct rproc *rproc, const u8 *elf_data, size_t len)
+{
+ struct device *dev = rproc->dev;
+ struct elf32_hdr *ehdr;
+ struct elf32_phdr *phdr;
+ int i, ret = 0;
+
+ ehdr = (struct elf32_hdr *)elf_data;
+ phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
+
+ /* go through the available ELF segments */
+ for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
+ u32 da = phdr->p_paddr;
+ u32 memsz = phdr->p_memsz;
+ u32 filesz = phdr->p_filesz;
+ u32 offset = phdr->p_offset;
+ void *ptr;
+
+ if (phdr->p_type != PT_LOAD)
+ continue;
+
+ dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
+ phdr->p_type, da, memsz, filesz);
+
+ if (filesz > memsz) {
+ dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
+ filesz, memsz);
+ ret = -EINVAL;
+ break;
+ }
+
+ if (offset + filesz > len) {
+ dev_err(dev, "truncated fw: need 0x%x avail 0x%x\n",
+ offset + filesz, len);
+ ret = -EINVAL;
+ break;
+ }
+
+ /* grab the kernel address for this device address */
+ ptr = rproc_da_to_va(rproc, da, memsz);
+ if (!ptr) {
+ dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
+ ret = -EINVAL;
+ break;
+ }
+
+ /* put the segment where the remote processor expects it */
+ if (phdr->p_filesz)
+ memcpy(ptr, elf_data + phdr->p_offset, filesz);
+
+ /*
+ * Zero out remaining memory for this segment.
+ *
+ * This isn't strictly required since dma_alloc_coherent already
+ * did this for us. albeit harmless, we may consider removing
+ * this.
+ */
+ if (memsz > filesz)
+ memset(ptr + filesz, 0, memsz - filesz);
+ }
+
+ return ret;
+}
+
+static int
+__rproc_handle_vring(struct rproc_vdev *rvdev, struct fw_rsc_vdev *rsc, int i)
+{
+ struct rproc *rproc = rvdev->rproc;
+ struct device *dev = rproc->dev;
+ struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
+ dma_addr_t dma;
+ void *va;
+ int ret, size, notifyid;
+
+ dev_dbg(dev, "vdev rsc: vring%d: da %x, qsz %d, align %d\n",
+ i, vring->da, vring->num, vring->align);
+
+ /* make sure reserved bytes are zeroes */
+ if (vring->reserved) {
+ dev_err(dev, "vring rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ /* verify queue size and vring alignment are sane */
+ if (!vring->num || !vring->align) {
+ dev_err(dev, "invalid qsz (%d) or alignment (%d)\n",
+ vring->num, vring->align);
+ return -EINVAL;
+ }
+
+ /* actual size of vring (in bytes) */
+ size = PAGE_ALIGN(vring_size(vring->num, vring->align));
+
+ if (!idr_pre_get(&rproc->notifyids, GFP_KERNEL)) {
+ dev_err(dev, "idr_pre_get failed\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Allocate non-cacheable memory for the vring. In the future
+ * this call will also configure the IOMMU for us
+ */
+ va = dma_alloc_coherent(dev, size, &dma, GFP_KERNEL);
+ if (!va) {
+ dev_err(dev, "dma_alloc_coherent failed\n");
+ return -EINVAL;
+ }
+
+ /* assign an rproc-wide unique index for this vring */
+ /* TODO: assign a notifyid for rvdev updates as well */
+ ret = idr_get_new(&rproc->notifyids, &rvdev->vring[i], &notifyid);
+ if (ret) {
+ dev_err(dev, "idr_get_new failed: %d\n", ret);
+ dma_free_coherent(dev, size, va, dma);
+ return ret;
+ }
+
+ /* let the rproc know the da and notifyid of this vring */
+ /* TODO: expose this to remote processor */
+ vring->da = dma;
+ vring->notifyid = notifyid;
+
+ dev_dbg(dev, "vring%d: va %p dma %x size %x idr %d\n", i, va,
+ dma, size, notifyid);
+
+ rvdev->vring[i].len = vring->num;
+ rvdev->vring[i].align = vring->align;
+ rvdev->vring[i].va = va;
+ rvdev->vring[i].dma = dma;
+ rvdev->vring[i].notifyid = notifyid;
+ rvdev->vring[i].rvdev = rvdev;
+
+ return 0;
+}
+
+static void __rproc_free_vrings(struct rproc_vdev *rvdev, int i)
+{
+ struct rproc *rproc = rvdev->rproc;
+
+ for (i--; i > 0; i--) {
+ struct rproc_vring *rvring = &rvdev->vring[i];
+ int size = PAGE_ALIGN(vring_size(rvring->len, rvring->align));
+
+ dma_free_coherent(rproc->dev, size, rvring->va, rvring->dma);
+ idr_remove(&rproc->notifyids, rvring->notifyid);
+ }
+}
+
+/**
+ * rproc_handle_vdev() - handle a vdev fw resource
+ * @rproc: the remote processor
+ * @rsc: the vring resource descriptor
+ * @avail: size of available data (for sanity checking the image)
+ *
+ * This resource entry requests the host to statically register a virtio
+ * device (vdev), and setup everything needed to support it. It contains
+ * everything needed to make it possible: the virtio device id, virtio
+ * device features, vrings information, virtio config space, etc...
+ *
+ * Before registering the vdev, the vrings are allocated from non-cacheable
+ * physically contiguous memory. Currently we only support two vrings per
+ * remote processor (temporary limitation). We might also want to consider
+ * doing the vring allocation only later when ->find_vqs() is invoked, and
+ * then release them upon ->del_vqs().
+ *
+ * Note: @da is currently not really handled correctly: we dynamically
+ * allocate it using the DMA API, ignoring requested hard coded addresses,
+ * and we don't take care of any required IOMMU programming. This is all
+ * going to be taken care of when the generic iommu-based DMA API will be
+ * merged. Meanwhile, statically-addressed iommu-based firmware images should
+ * use RSC_DEVMEM resource entries to map their required @da to the physical
+ * address of their base CMA region (ouch, hacky!).
+ *
+ * Returns 0 on success, or an appropriate error code otherwise
+ */
+static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc,
+ int avail)
+{
+ struct device *dev = rproc->dev;
+ struct rproc_vdev *rvdev;
+ int i, ret;
+
+ /* make sure resource isn't truncated */
+ if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
+ + rsc->config_len > avail) {
+ dev_err(rproc->dev, "vdev rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /* make sure reserved bytes are zeroes */
+ if (rsc->reserved[0] || rsc->reserved[1]) {
+ dev_err(dev, "vdev rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n",
+ rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);
+
+ /* we currently support only two vrings per rvdev */
+ if (rsc->num_of_vrings > ARRAY_SIZE(rvdev->vring)) {
+ dev_err(dev, "too many vrings: %d\n", rsc->num_of_vrings);
+ return -EINVAL;
+ }
+
+ rvdev = kzalloc(sizeof(struct rproc_vdev), GFP_KERNEL);
+ if (!rvdev)
+ return -ENOMEM;
+
+ rvdev->rproc = rproc;
+
+ /* allocate the vrings */
+ for (i = 0; i < rsc->num_of_vrings; i++) {
+ ret = __rproc_handle_vring(rvdev, rsc, i);
+ if (ret)
+ goto free_vrings;
+ }
+
+ /* remember the device features */
+ rvdev->dfeatures = rsc->dfeatures;
+
+ list_add_tail(&rvdev->node, &rproc->rvdevs);
+
+ /* it is now safe to add the virtio device */
+ ret = rproc_add_virtio_dev(rvdev, rsc->id);
+ if (ret)
+ goto free_vrings;
+
+ return 0;
+
+free_vrings:
+ __rproc_free_vrings(rvdev, i);
+ kfree(rvdev);
+ return ret;
+}
+
+/**
+ * rproc_handle_trace() - handle a shared trace buffer resource
+ * @rproc: the remote processor
+ * @rsc: the trace resource descriptor
+ * @avail: size of available data (for sanity checking the image)
+ *
+ * In case the remote processor dumps trace logs into memory,
+ * export it via debugfs.
+ *
+ * Currently, the 'da' member of @rsc should contain the device address
+ * where the remote processor is dumping the traces. Later we could also
+ * support dynamically allocating this address using the generic
+ * DMA API (but currently there isn't a use case for that).
+ *
+ * Returns 0 on success, or an appropriate error code otherwise
+ */
+static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc,
+ int avail)
+{
+ struct rproc_mem_entry *trace;
+ struct device *dev = rproc->dev;
+ void *ptr;
+ char name[15];
+
+ if (sizeof(*rsc) > avail) {
+ dev_err(rproc->dev, "trace rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /* make sure reserved bytes are zeroes */
+ if (rsc->reserved) {
+ dev_err(dev, "trace rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ /* what's the kernel address of this resource ? */
+ ptr = rproc_da_to_va(rproc, rsc->da, rsc->len);
+ if (!ptr) {
+ dev_err(dev, "erroneous trace resource entry\n");
+ return -EINVAL;
+ }
+
+ trace = kzalloc(sizeof(*trace), GFP_KERNEL);
+ if (!trace) {
+ dev_err(dev, "kzalloc trace failed\n");
+ return -ENOMEM;
+ }
+
+ /* set the trace buffer dma properties */
+ trace->len = rsc->len;
+ trace->va = ptr;
+
+ /* make sure snprintf always null terminates, even if truncating */
+ snprintf(name, sizeof(name), "trace%d", rproc->num_traces);
+
+ /* create the debugfs entry */
+ trace->priv = rproc_create_trace_file(name, rproc, trace);
+ if (!trace->priv) {
+ trace->va = NULL;
+ kfree(trace);
+ return -EINVAL;
+ }
+
+ list_add_tail(&trace->node, &rproc->traces);
+
+ rproc->num_traces++;
+
+ dev_dbg(dev, "%s added: va %p, da 0x%x, len 0x%x\n", name, ptr,
+ rsc->da, rsc->len);
+
+ return 0;
+}
+
+/**
+ * rproc_handle_devmem() - handle devmem resource entry
+ * @rproc: remote processor handle
+ * @rsc: the devmem resource entry
+ * @avail: size of available data (for sanity checking the image)
+ *
+ * Remote processors commonly need to access certain on-chip peripherals.
+ *
+ * Some of these remote processors access memory via an iommu device,
+ * and might require us to configure their iommu before they can access
+ * the on-chip peripherals they need.
+ *
+ * This resource entry is a request to map such a peripheral device.
+ *
+ * These devmem entries will contain the physical address of the device in
+ * the 'pa' member. If a specific device address is expected, then 'da' will
+ * contain it (currently this is the only use case supported). 'len' will
+ * contain the size of the physical region we need to map.
+ *
+ * Currently we just "trust" those devmem entries to contain valid physical
+ * addresses, but this is going to change: we want the implementations to
+ * tell us ranges of physical addresses the firmware is allowed to request,
+ * and not allow firmwares to request access to physical addresses that
+ * are outside those ranges.
+ */
+static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc,
+ int avail)
+{
+ struct rproc_mem_entry *mapping;
+ int ret;
+
+ /* no point in handling this resource without a valid iommu domain */
+ if (!rproc->domain)
+ return -EINVAL;
+
+ if (sizeof(*rsc) > avail) {
+ dev_err(rproc->dev, "devmem rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /* make sure reserved bytes are zeroes */
+ if (rsc->reserved) {
+ dev_err(rproc->dev, "devmem rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping) {
+ dev_err(rproc->dev, "kzalloc mapping failed\n");
+ return -ENOMEM;
+ }
+
+ ret = iommu_map(rproc->domain, rsc->da, rsc->pa, rsc->len, rsc->flags);
+ if (ret) {
+ dev_err(rproc->dev, "failed to map devmem: %d\n", ret);
+ goto out;
+ }
+
+ /*
+ * We'll need this info later when we'll want to unmap everything
+ * (e.g. on shutdown).
+ *
+ * We can't trust the remote processor not to change the resource
+ * table, so we must maintain this info independently.
+ */
+ mapping->da = rsc->da;
+ mapping->len = rsc->len;
+ list_add_tail(&mapping->node, &rproc->mappings);
+
+ dev_dbg(rproc->dev, "mapped devmem pa 0x%x, da 0x%x, len 0x%x\n",
+ rsc->pa, rsc->da, rsc->len);
+
+ return 0;
+
+out:
+ kfree(mapping);
+ return ret;
+}
+
+/**
+ * rproc_handle_carveout() - handle phys contig memory allocation requests
+ * @rproc: rproc handle
+ * @rsc: the resource entry
+ * @avail: size of available data (for image validation)
+ *
+ * This function will handle firmware requests for allocation of physically
+ * contiguous memory regions.
+ *
+ * These request entries should come first in the firmware's resource table,
+ * as other firmware entries might request placing other data objects inside
+ * these memory regions (e.g. data/code segments, trace resource entries, ...).
+ *
+ * Allocating memory this way helps utilizing the reserved physical memory
+ * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
+ * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
+ * pressure is important; it may have a substantial impact on performance.
+ */
+static int rproc_handle_carveout(struct rproc *rproc,
+ struct fw_rsc_carveout *rsc, int avail)
+{
+ struct rproc_mem_entry *carveout, *mapping;
+ struct device *dev = rproc->dev;
+ dma_addr_t dma;
+ void *va;
+ int ret;
+
+ if (sizeof(*rsc) > avail) {
+ dev_err(rproc->dev, "carveout rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /* make sure reserved bytes are zeroes */
+ if (rsc->reserved) {
+ dev_err(dev, "carveout rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "carveout rsc: da %x, pa %x, len %x, flags %x\n",
+ rsc->da, rsc->pa, rsc->len, rsc->flags);
+
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping) {
+ dev_err(dev, "kzalloc mapping failed\n");
+ return -ENOMEM;
+ }
+
+ carveout = kzalloc(sizeof(*carveout), GFP_KERNEL);
+ if (!carveout) {
+ dev_err(dev, "kzalloc carveout failed\n");
+ ret = -ENOMEM;
+ goto free_mapping;
+ }
+
+ va = dma_alloc_coherent(dev, rsc->len, &dma, GFP_KERNEL);
+ if (!va) {
+ dev_err(dev, "failed to dma alloc carveout: %d\n", rsc->len);
+ ret = -ENOMEM;
+ goto free_carv;
+ }
+
+ dev_dbg(dev, "carveout va %p, dma %x, len 0x%x\n", va, dma, rsc->len);
+
+ /*
+ * Ok, this is non-standard.
+ *
+ * Sometimes we can't rely on the generic iommu-based DMA API
+ * to dynamically allocate the device address and then set the IOMMU
+ * tables accordingly, because some remote processors might
+ * _require_ us to use hard coded device addresses that their
+ * firmware was compiled with.
+ *
+ * In this case, we must use the IOMMU API directly and map
+ * the memory to the device address as expected by the remote
+ * processor.
+ *
+ * Obviously such remote processor devices should not be configured
+ * to use the iommu-based DMA API: we expect 'dma' to contain the
+ * physical address in this case.
+ */
+ if (rproc->domain) {
+ ret = iommu_map(rproc->domain, rsc->da, dma, rsc->len,
+ rsc->flags);
+ if (ret) {
+ dev_err(dev, "iommu_map failed: %d\n", ret);
+ goto dma_free;
+ }
+
+ /*
+ * We'll need this info later when we'll want to unmap
+ * everything (e.g. on shutdown).
+ *
+ * We can't trust the remote processor not to change the
+ * resource table, so we must maintain this info independently.
+ */
+ mapping->da = rsc->da;
+ mapping->len = rsc->len;
+ list_add_tail(&mapping->node, &rproc->mappings);
+
+ dev_dbg(dev, "carveout mapped 0x%x to 0x%x\n", rsc->da, dma);
+
+ /*
+ * Some remote processors might need to know the pa
+ * even though they are behind an IOMMU. E.g., OMAP4's
+ * remote M3 processor needs this so it can control
+ * on-chip hardware accelerators that are not behind
+ * the IOMMU, and therefor must know the pa.
+ *
+ * Generally we don't want to expose physical addresses
+ * if we don't have to (remote processors are generally
+ * _not_ trusted), so we might want to do this only for
+ * remote processor that _must_ have this (e.g. OMAP4's
+ * dual M3 subsystem).
+ */
+ rsc->pa = dma;
+ }
+
+ carveout->va = va;
+ carveout->len = rsc->len;
+ carveout->dma = dma;
+ carveout->da = rsc->da;
+
+ list_add_tail(&carveout->node, &rproc->carveouts);
+
+ return 0;
+
+dma_free:
+ dma_free_coherent(dev, rsc->len, va, dma);
+free_carv:
+ kfree(carveout);
+free_mapping:
+ kfree(mapping);
+ return ret;
+}
+
+/*
+ * A lookup table for resource handlers. The indices are defined in
+ * enum fw_resource_type.
+ */
+static rproc_handle_resource_t rproc_handle_rsc[] = {
+ [RSC_CARVEOUT] = (rproc_handle_resource_t)rproc_handle_carveout,
+ [RSC_DEVMEM] = (rproc_handle_resource_t)rproc_handle_devmem,
+ [RSC_TRACE] = (rproc_handle_resource_t)rproc_handle_trace,
+ [RSC_VDEV] = NULL, /* VDEVs were handled upon registrarion */
+};
+
+/* handle firmware resource entries before booting the remote processor */
+static int
+rproc_handle_boot_rsc(struct rproc *rproc, struct resource_table *table, int len)
+{
+ struct device *dev = rproc->dev;
+ rproc_handle_resource_t handler;
+ int ret = 0, i;
+
+ for (i = 0; i < table->num; i++) {
+ int offset = table->offset[i];
+ struct fw_rsc_hdr *hdr = (void *)table + offset;
+ int avail = len - offset - sizeof(*hdr);
+ void *rsc = (void *)hdr + sizeof(*hdr);
+
+ /* make sure table isn't truncated */
+ if (avail < 0) {
+ dev_err(dev, "rsc table is truncated\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "rsc: type %d\n", hdr->type);
+
+ if (hdr->type >= RSC_LAST) {
+ dev_warn(dev, "unsupported resource %d\n", hdr->type);
+ continue;
+ }
+
+ handler = rproc_handle_rsc[hdr->type];
+ if (!handler)
+ continue;
+
+ ret = handler(rproc, rsc, avail);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/* handle firmware resource entries while registering the remote processor */
+static int
+rproc_handle_virtio_rsc(struct rproc *rproc, struct resource_table *table, int len)
+{
+ struct device *dev = rproc->dev;
+ int ret = 0, i;
+
+ for (i = 0; i < table->num; i++) {
+ int offset = table->offset[i];
+ struct fw_rsc_hdr *hdr = (void *)table + offset;
+ int avail = len - offset - sizeof(*hdr);
+ struct fw_rsc_vdev *vrsc;
+
+ /* make sure table isn't truncated */
+ if (avail < 0) {
+ dev_err(dev, "rsc table is truncated\n");
+ return -EINVAL;
+ }
+
+ dev_dbg(dev, "%s: rsc type %d\n", __func__, hdr->type);
+
+ if (hdr->type != RSC_VDEV)
+ continue;
+
+ vrsc = (struct fw_rsc_vdev *)hdr->data;
+
+ ret = rproc_handle_vdev(rproc, vrsc, avail);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * rproc_find_rsc_table() - find the resource table
+ * @rproc: the rproc handle
+ * @elf_data: the content of the ELF firmware image
+ * @len: firmware size (in bytes)
+ * @tablesz: place holder for providing back the table size
+ *
+ * This function finds the resource table inside the remote processor's
+ * firmware. It is used both upon the registration of @rproc (in order
+ * to look for and register the supported virito devices), and when the
+ * @rproc is booted.
+ *
+ * Returns the pointer to the resource table if it is found, and write its
+ * size into @tablesz. If a valid table isn't found, NULL is returned
+ * (and @tablesz isn't set).
+ */
+static struct resource_table *
+rproc_find_rsc_table(struct rproc *rproc, const u8 *elf_data, size_t len,
+ int *tablesz)
+{
+ struct elf32_hdr *ehdr;
+ struct elf32_shdr *shdr;
+ const char *name_table;
+ struct device *dev = rproc->dev;
+ struct resource_table *table = NULL;
+ int i;
+
+ ehdr = (struct elf32_hdr *)elf_data;
+ shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
+ name_table = elf_data + shdr[ehdr->e_shstrndx].sh_offset;
+
+ /* look for the resource table and handle it */
+ for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
+ int size = shdr->sh_size;
+ int offset = shdr->sh_offset;
+
+ if (strcmp(name_table + shdr->sh_name, ".resource_table"))
+ continue;
+
+ table = (struct resource_table *)(elf_data + offset);
+
+ /* make sure we have the entire table */
+ if (offset + size > len) {
+ dev_err(dev, "resource table truncated\n");
+ return NULL;
+ }
+
+ /* make sure table has at least the header */
+ if (sizeof(struct resource_table) > size) {
+ dev_err(dev, "header-less resource table\n");
+ return NULL;
+ }
+
+ /* we don't support any version beyond the first */
+ if (table->ver != 1) {
+ dev_err(dev, "unsupported fw ver: %d\n", table->ver);
+ return NULL;
+ }
+
+ /* make sure reserved bytes are zeroes */
+ if (table->reserved[0] || table->reserved[1]) {
+ dev_err(dev, "non zero reserved bytes\n");
+ return NULL;
+ }
+
+ /* make sure the offsets array isn't truncated */
+ if (table->num * sizeof(table->offset[0]) +
+ sizeof(struct resource_table) > size) {
+ dev_err(dev, "resource table incomplete\n");
+ return NULL;
+ }
+
+ *tablesz = shdr->sh_size;
+ break;
+ }
+
+ return table;
+}
+
+/**
+ * rproc_resource_cleanup() - clean up and free all acquired resources
+ * @rproc: rproc handle
+ *
+ * This function will free all resources acquired for @rproc, and it
+ * is called whenever @rproc either shuts down or fails to boot.
+ */
+static void rproc_resource_cleanup(struct rproc *rproc)
+{
+ struct rproc_mem_entry *entry, *tmp;
+ struct device *dev = rproc->dev;
+
+ /* clean up debugfs trace entries */
+ list_for_each_entry_safe(entry, tmp, &rproc->traces, node) {
+ rproc_remove_trace_file(entry->priv);
+ rproc->num_traces--;
+ list_del(&entry->node);
+ kfree(entry);
+ }
+
+ /* clean up carveout allocations */
+ list_for_each_entry_safe(entry, tmp, &rproc->carveouts, node) {
+ dma_free_coherent(dev, entry->len, entry->va, entry->dma);
+ list_del(&entry->node);
+ kfree(entry);
+ }
+
+ /* clean up iommu mapping entries */
+ list_for_each_entry_safe(entry, tmp, &rproc->mappings, node) {
+ size_t unmapped;
+
+ unmapped = iommu_unmap(rproc->domain, entry->da, entry->len);
+ if (unmapped != entry->len) {
+ /* nothing much to do besides complaining */
+ dev_err(dev, "failed to unmap %u/%u\n", entry->len,
+ unmapped);
+ }
+
+ list_del(&entry->node);
+ kfree(entry);
+ }
+}
+
+/* make sure this fw image is sane */
+static int rproc_fw_sanity_check(struct rproc *rproc, const struct firmware *fw)
+{
+ const char *name = rproc->firmware;
+ struct device *dev = rproc->dev;
+ struct elf32_hdr *ehdr;
+ char class;
+
+ if (!fw) {
+ dev_err(dev, "failed to load %s\n", name);
+ return -EINVAL;
+ }
+
+ if (fw->size < sizeof(struct elf32_hdr)) {
+ dev_err(dev, "Image is too small\n");
+ return -EINVAL;
+ }
+
+ ehdr = (struct elf32_hdr *)fw->data;
+
+ /* We only support ELF32 at this point */
+ class = ehdr->e_ident[EI_CLASS];
+ if (class != ELFCLASS32) {
+ dev_err(dev, "Unsupported class: %d\n", class);
+ return -EINVAL;
+ }
+
+ /* We assume the firmware has the same endianess as the host */
+# ifdef __LITTLE_ENDIAN
+ if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) {
+# else /* BIG ENDIAN */
+ if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) {
+# endif
+ dev_err(dev, "Unsupported firmware endianess\n");
+ return -EINVAL;
+ }
+
+ if (fw->size < ehdr->e_shoff + sizeof(struct elf32_shdr)) {
+ dev_err(dev, "Image is too small\n");
+ return -EINVAL;
+ }
+
+ if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) {
+ dev_err(dev, "Image is corrupted (bad magic)\n");
+ return -EINVAL;
+ }
+
+ if (ehdr->e_phnum == 0) {
+ dev_err(dev, "No loadable segments\n");
+ return -EINVAL;
+ }
+
+ if (ehdr->e_phoff > fw->size) {
+ dev_err(dev, "Firmware size is too small\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/*
+ * take a firmware and boot a remote processor with it.
+ */
+static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
+{
+ struct device *dev = rproc->dev;
+ const char *name = rproc->firmware;
+ struct elf32_hdr *ehdr;
+ struct resource_table *table;
+ int ret, tablesz;
+
+ ret = rproc_fw_sanity_check(rproc, fw);
+ if (ret)
+ return ret;
+
+ ehdr = (struct elf32_hdr *)fw->data;
+
+ dev_info(dev, "Booting fw image %s, size %d\n", name, fw->size);
+
+ /*
+ * if enabling an IOMMU isn't relevant for this rproc, this is
+ * just a nop
+ */
+ ret = rproc_enable_iommu(rproc);
+ if (ret) {
+ dev_err(dev, "can't enable iommu: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * The ELF entry point is the rproc's boot addr (though this is not
+ * a configurable property of all remote processors: some will always
+ * boot at a specific hardcoded address).
+ */
+ rproc->bootaddr = ehdr->e_entry;
+
+ /* look for the resource table */
+ table = rproc_find_rsc_table(rproc, fw->data, fw->size, &tablesz);
+ if (!table)
+ goto clean_up;
+
+ /* handle fw resources which are required to boot rproc */
+ ret = rproc_handle_boot_rsc(rproc, table, tablesz);
+ if (ret) {
+ dev_err(dev, "Failed to process resources: %d\n", ret);
+ goto clean_up;
+ }
+
+ /* load the ELF segments to memory */
+ ret = rproc_load_segments(rproc, fw->data, fw->size);
+ if (ret) {
+ dev_err(dev, "Failed to load program segments: %d\n", ret);
+ goto clean_up;
+ }
+
+ /* power up the remote processor */
+ ret = rproc->ops->start(rproc);
+ if (ret) {
+ dev_err(dev, "can't start rproc %s: %d\n", rproc->name, ret);
+ goto clean_up;
+ }
+
+ rproc->state = RPROC_RUNNING;
+
+ dev_info(dev, "remote processor %s is now up\n", rproc->name);
+
+ return 0;
+
+clean_up:
+ rproc_resource_cleanup(rproc);
+ rproc_disable_iommu(rproc);
+ return ret;
+}
+
+/*
+ * take a firmware and look for virtio devices to register.
+ *
+ * Note: this function is called asynchronously upon registration of the
+ * remote processor (so we must wait until it completes before we try
+ * to unregister the device. one other option is just to use kref here,
+ * that might be cleaner).
+ */
+static void rproc_fw_config_virtio(const struct firmware *fw, void *context)
+{
+ struct rproc *rproc = context;
+ struct resource_table *table;
+ int ret, tablesz;
+
+ if (rproc_fw_sanity_check(rproc, fw) < 0)
+ goto out;
+
+ /* look for the resource table */
+ table = rproc_find_rsc_table(rproc, fw->data, fw->size, &tablesz);
+ if (!table)
+ goto out;
+
+ /* look for virtio devices and register them */
+ ret = rproc_handle_virtio_rsc(rproc, table, tablesz);
+ if (ret)
+ goto out;
+
+out:
+ if (fw)
+ release_firmware(fw);
+ /* allow rproc_unregister() contexts, if any, to proceed */
+ complete_all(&rproc->firmware_loading_complete);
+}
+
+/**
+ * rproc_boot() - boot a remote processor
+ * @rproc: handle of a remote processor
+ *
+ * Boot a remote processor (i.e. load its firmware, power it on, ...).
+ *
+ * If the remote processor is already powered on, this function immediately
+ * returns (successfully).
+ *
+ * Returns 0 on success, and an appropriate error value otherwise.
+ */
+int rproc_boot(struct rproc *rproc)
+{
+ const struct firmware *firmware_p;
+ struct device *dev;
+ int ret;
+
+ if (!rproc) {
+ pr_err("invalid rproc handle\n");
+ return -EINVAL;
+ }
+
+ dev = rproc->dev;
+
+ ret = mutex_lock_interruptible(&rproc->lock);
+ if (ret) {
+ dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
+ return ret;
+ }
+
+ /* loading a firmware is required */
+ if (!rproc->firmware) {
+ dev_err(dev, "%s: no firmware to load\n", __func__);
+ ret = -EINVAL;
+ goto unlock_mutex;
+ }
+
+ /* prevent underlying implementation from being removed */
+ if (!try_module_get(dev->driver->owner)) {
+ dev_err(dev, "%s: can't get owner\n", __func__);
+ ret = -EINVAL;
+ goto unlock_mutex;
+ }
+
+ /* skip the boot process if rproc is already powered up */
+ if (atomic_inc_return(&rproc->power) > 1) {
+ ret = 0;
+ goto unlock_mutex;
+ }
+
+ dev_info(dev, "powering up %s\n", rproc->name);
+
+ /* load firmware */
+ ret = request_firmware(&firmware_p, rproc->firmware, dev);
+ if (ret < 0) {
+ dev_err(dev, "request_firmware failed: %d\n", ret);
+ goto downref_rproc;
+ }
+
+ ret = rproc_fw_boot(rproc, firmware_p);
+
+ release_firmware(firmware_p);
+
+downref_rproc:
+ if (ret) {
+ module_put(dev->driver->owner);
+ atomic_dec(&rproc->power);
+ }
+unlock_mutex:
+ mutex_unlock(&rproc->lock);
+ return ret;
+}
+EXPORT_SYMBOL(rproc_boot);
+
+/**
+ * rproc_shutdown() - power off the remote processor
+ * @rproc: the remote processor
+ *
+ * Power off a remote processor (previously booted with rproc_boot()).
+ *
+ * In case @rproc is still being used by an additional user(s), then
+ * this function will just decrement the power refcount and exit,
+ * without really powering off the device.
+ *
+ * Every call to rproc_boot() must (eventually) be accompanied by a call
+ * to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.
+ *
+ * Notes:
+ * - we're not decrementing the rproc's refcount, only the power refcount.
+ * which means that the @rproc handle stays valid even after rproc_shutdown()
+ * returns, and users can still use it with a subsequent rproc_boot(), if
+ * needed.
+ * - don't call rproc_shutdown() to unroll rproc_get_by_name(), exactly
+ * because rproc_shutdown() _does not_ decrement the refcount of @rproc.
+ * To decrement the refcount of @rproc, use rproc_put() (but _only_ if
+ * you acquired @rproc using rproc_get_by_name()).
+ */
+void rproc_shutdown(struct rproc *rproc)
+{
+ struct device *dev = rproc->dev;
+ int ret;
+
+ ret = mutex_lock_interruptible(&rproc->lock);
+ if (ret) {
+ dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
+ return;
+ }
+
+ /* if the remote proc is still needed, bail out */
+ if (!atomic_dec_and_test(&rproc->power))
+ goto out;
+
+ /* power off the remote processor */
+ ret = rproc->ops->stop(rproc);
+ if (ret) {
+ atomic_inc(&rproc->power);
+ dev_err(dev, "can't stop rproc: %d\n", ret);
+ goto out;
+ }
+
+ /* clean up all acquired resources */
+ rproc_resource_cleanup(rproc);
+
+ rproc_disable_iommu(rproc);
+
+ rproc->state = RPROC_OFFLINE;
+
+ dev_info(dev, "stopped remote processor %s\n", rproc->name);
+
+out:
+ mutex_unlock(&rproc->lock);
+ if (!ret)
+ module_put(dev->driver->owner);
+}
+EXPORT_SYMBOL(rproc_shutdown);
+
+/**
+ * rproc_release() - completely deletes the existence of a remote processor
+ * @kref: the rproc's kref
+ *
+ * This function should _never_ be called directly.
+ *
+ * The only reasonable location to use it is as an argument when kref_put'ing
+ * @rproc's refcount.
+ *
+ * This way it will be called when no one holds a valid pointer to this @rproc
+ * anymore (and obviously after it is removed from the rprocs klist).
+ *
+ * Note: this function is not static because rproc_vdev_release() needs it when
+ * it decrements @rproc's refcount.
+ */
+void rproc_release(struct kref *kref)
+{
+ struct rproc *rproc = container_of(kref, struct rproc, refcount);
+ struct rproc_vdev *rvdev, *rvtmp;
+
+ dev_info(rproc->dev, "removing %s\n", rproc->name);
+
+ rproc_delete_debug_dir(rproc);
+
+ /* clean up remote vdev entries */
+ list_for_each_entry_safe(rvdev, rvtmp, &rproc->rvdevs, node) {
+ __rproc_free_vrings(rvdev, RVDEV_NUM_VRINGS);
+ list_del(&rvdev->node);
+ }
+
+ /*
+ * At this point no one holds a reference to rproc anymore,
+ * so we can directly unroll rproc_alloc()
+ */
+ rproc_free(rproc);
+}
+
+/* will be called when an rproc is added to the rprocs klist */
+static void klist_rproc_get(struct klist_node *n)
+{
+ struct rproc *rproc = container_of(n, struct rproc, node);
+
+ kref_get(&rproc->refcount);
+}
+
+/* will be called when an rproc is removed from the rprocs klist */
+static void klist_rproc_put(struct klist_node *n)
+{
+ struct rproc *rproc = container_of(n, struct rproc, node);
+
+ kref_put(&rproc->refcount, rproc_release);
+}
+
+static struct rproc *next_rproc(struct klist_iter *i)
+{
+ struct klist_node *n;
+
+ n = klist_next(i);
+ if (!n)
+ return NULL;
+
+ return container_of(n, struct rproc, node);
+}
+
+/**
+ * rproc_get_by_name() - find a remote processor by name and boot it
+ * @name: name of the remote processor
+ *
+ * Finds an rproc handle using the remote processor's name, and then
+ * boot it. If it's already powered on, then just immediately return
+ * (successfully).
+ *
+ * Returns the rproc handle on success, and NULL on failure.
+ *
+ * This function increments the remote processor's refcount, so always
+ * use rproc_put() to decrement it back once rproc isn't needed anymore.
+ *
+ * Note: currently this function (and its counterpart rproc_put()) are not
+ * being used. We need to scrutinize the use cases
+ * that still need them, and see if we can migrate them to use the non
+ * name-based boot/shutdown interface.
+ */
+struct rproc *rproc_get_by_name(const char *name)
+{
+ struct rproc *rproc;
+ struct klist_iter i;
+ int ret;
+
+ /* find the remote processor, and upref its refcount */
+ klist_iter_init(&rprocs, &i);
+ while ((rproc = next_rproc(&i)) != NULL)
+ if (!strcmp(rproc->name, name)) {
+ kref_get(&rproc->refcount);
+ break;
+ }
+ klist_iter_exit(&i);
+
+ /* can't find this rproc ? */
+ if (!rproc) {
+ pr_err("can't find remote processor %s\n", name);
+ return NULL;
+ }
+
+ ret = rproc_boot(rproc);
+ if (ret < 0) {
+ kref_put(&rproc->refcount, rproc_release);
+ return NULL;
+ }
+
+ return rproc;
+}
+EXPORT_SYMBOL(rproc_get_by_name);
+
+/**
+ * rproc_put() - decrement the refcount of a remote processor, and shut it down
+ * @rproc: the remote processor
+ *
+ * This function tries to shutdown @rproc, and it then decrements its
+ * refcount.
+ *
+ * After this function returns, @rproc may _not_ be used anymore, and its
+ * handle should be considered invalid.
+ *
+ * This function should be called _iff_ the @rproc handle was grabbed by
+ * calling rproc_get_by_name().
+ */
+void rproc_put(struct rproc *rproc)
+{
+ /* try to power off the remote processor */
+ rproc_shutdown(rproc);
+
+ /* downref rproc's refcount */
+ kref_put(&rproc->refcount, rproc_release);
+}
+EXPORT_SYMBOL(rproc_put);
+
+/**
+ * rproc_register() - register a remote processor
+ * @rproc: the remote processor handle to register
+ *
+ * Registers @rproc with the remoteproc framework, after it has been
+ * allocated with rproc_alloc().
+ *
+ * This is called by the platform-specific rproc implementation, whenever
+ * a new remote processor device is probed.
+ *
+ * Returns 0 on success and an appropriate error code otherwise.
+ *
+ * Note: this function initiates an asynchronous firmware loading
+ * context, which will look for virtio devices supported by the rproc's
+ * firmware.
+ *
+ * If found, those virtio devices will be created and added, so as a result
+ * of registering this remote processor, additional virtio drivers might be
+ * probed.
+ */
+int rproc_register(struct rproc *rproc)
+{
+ struct device *dev = rproc->dev;
+ int ret = 0;
+
+ /* expose to rproc_get_by_name users */
+ klist_add_tail(&rproc->node, &rprocs);
+
+ dev_info(rproc->dev, "%s is available\n", rproc->name);
+
+ dev_info(dev, "Note: remoteproc is still under development and considered experimental.\n");
+ dev_info(dev, "THE BINARY FORMAT IS NOT YET FINALIZED, and backward compatibility isn't yet guaranteed.\n");
+
+ /* create debugfs entries */
+ rproc_create_debug_dir(rproc);
+
+ /* rproc_unregister() calls must wait until async loader completes */
+ init_completion(&rproc->firmware_loading_complete);
+
+ /*
+ * We must retrieve early virtio configuration info from
+ * the firmware (e.g. whether to register a virtio device,
+ * what virtio features does it support, ...).
+ *
+ * We're initiating an asynchronous firmware loading, so we can
+ * be built-in kernel code, without hanging the boot process.
+ */
+ ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_HOTPLUG,
+ rproc->firmware, dev, GFP_KERNEL,
+ rproc, rproc_fw_config_virtio);
+ if (ret < 0) {
+ dev_err(dev, "request_firmware_nowait failed: %d\n", ret);
+ complete_all(&rproc->firmware_loading_complete);
+ klist_remove(&rproc->node);
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL(rproc_register);
+
+/**
+ * rproc_alloc() - allocate a remote processor handle
+ * @dev: the underlying device
+ * @name: name of this remote processor
+ * @ops: platform-specific handlers (mainly start/stop)
+ * @firmware: name of firmware file to load
+ * @len: length of private data needed by the rproc driver (in bytes)
+ *
+ * Allocates a new remote processor handle, but does not register
+ * it yet.
+ *
+ * This function should be used by rproc implementations during initialization
+ * of the remote processor.
+ *
+ * After creating an rproc handle using this function, and when ready,
+ * implementations should then call rproc_register() to complete
+ * the registration of the remote processor.
+ *
+ * On success the new rproc is returned, and on failure, NULL.
+ *
+ * Note: _never_ directly deallocate @rproc, even if it was not registered
+ * yet. Instead, if you just need to unroll rproc_alloc(), use rproc_free().
+ */
+struct rproc *rproc_alloc(struct device *dev, const char *name,
+ const struct rproc_ops *ops,
+ const char *firmware, int len)
+{
+ struct rproc *rproc;
+
+ if (!dev || !name || !ops)
+ return NULL;
+
+ rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
+ if (!rproc) {
+ dev_err(dev, "%s: kzalloc failed\n", __func__);
+ return NULL;
+ }
+
+ rproc->dev = dev;
+ rproc->name = name;
+ rproc->ops = ops;
+ rproc->firmware = firmware;
+ rproc->priv = &rproc[1];
+
+ atomic_set(&rproc->power, 0);
+
+ kref_init(&rproc->refcount);
+
+ mutex_init(&rproc->lock);
+
+ idr_init(&rproc->notifyids);
+
+ INIT_LIST_HEAD(&rproc->carveouts);
+ INIT_LIST_HEAD(&rproc->mappings);
+ INIT_LIST_HEAD(&rproc->traces);
+ INIT_LIST_HEAD(&rproc->rvdevs);
+
+ rproc->state = RPROC_OFFLINE;
+
+ return rproc;
+}
+EXPORT_SYMBOL(rproc_alloc);
+
+/**
+ * rproc_free() - free an rproc handle that was allocated by rproc_alloc
+ * @rproc: the remote processor handle
+ *
+ * This function should _only_ be used if @rproc was only allocated,
+ * but not registered yet.
+ *
+ * If @rproc was already successfully registered (by calling rproc_register()),
+ * then use rproc_unregister() instead.
+ */
+void rproc_free(struct rproc *rproc)
+{
+ idr_remove_all(&rproc->notifyids);
+ idr_destroy(&rproc->notifyids);
+
+ kfree(rproc);
+}
+EXPORT_SYMBOL(rproc_free);
+
+/**
+ * rproc_unregister() - unregister a remote processor
+ * @rproc: rproc handle to unregister
+ *
+ * Unregisters a remote processor, and decrements its refcount.
+ * If its refcount drops to zero, then @rproc will be freed. If not,
+ * it will be freed later once the last reference is dropped.
+ *
+ * This function should be called when the platform specific rproc
+ * implementation decides to remove the rproc device. it should
+ * _only_ be called if a previous invocation of rproc_register()
+ * has completed successfully.
+ *
+ * After rproc_unregister() returns, @rproc is _not_ valid anymore and
+ * it shouldn't be used. More specifically, don't call rproc_free()
+ * or try to directly free @rproc after rproc_unregister() returns;
+ * none of these are needed, and calling them is a bug.
+ *
+ * Returns 0 on success and -EINVAL if @rproc isn't valid.
+ */
+int rproc_unregister(struct rproc *rproc)
+{
+ struct rproc_vdev *rvdev;
+
+ if (!rproc)
+ return -EINVAL;
+
+ /* if rproc is just being registered, wait */
+ wait_for_completion(&rproc->firmware_loading_complete);
+
+ /* clean up remote vdev entries */
+ list_for_each_entry(rvdev, &rproc->rvdevs, node)
+ rproc_remove_virtio_dev(rvdev);
+
+ /* the rproc is downref'ed as soon as it's removed from the klist */
+ klist_del(&rproc->node);
+
+ /* the rproc will only be released after its refcount drops to zero */
+ kref_put(&rproc->refcount, rproc_release);
+
+ return 0;
+}
+EXPORT_SYMBOL(rproc_unregister);
+
+static int __init remoteproc_init(void)
+{
+ rproc_init_debugfs();
+ return 0;
+}
+module_init(remoteproc_init);
+
+static void __exit remoteproc_exit(void)
+{
+ rproc_exit_debugfs();
+}
+module_exit(remoteproc_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Generic Remote Processor Framework");
diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c
new file mode 100644
index 000000000000..70277a530133
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_debugfs.c
@@ -0,0 +1,179 @@
+/*
+ * Remote Processor Framework
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Mark Grosen <mgrosen@ti.com>
+ * Brian Swetland <swetland@google.com>
+ * Fernando Guzman Lugo <fernando.lugo@ti.com>
+ * Suman Anna <s-anna@ti.com>
+ * Robert Tivy <rtivy@ti.com>
+ * Armando Uribe De Leon <x0095078@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/debugfs.h>
+#include <linux/remoteproc.h>
+#include <linux/device.h>
+
+/* remoteproc debugfs parent dir */
+static struct dentry *rproc_dbg;
+
+/*
+ * Some remote processors may support dumping trace logs into a shared
+ * memory buffer. We expose this trace buffer using debugfs, so users
+ * can easily tell what's going on remotely.
+ *
+ * We will most probably improve the rproc tracing facilities later on,
+ * but this kind of lightweight and simple mechanism is always good to have,
+ * as it provides very early tracing with little to no dependencies at all.
+ */
+static ssize_t rproc_trace_read(struct file *filp, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct rproc_mem_entry *trace = filp->private_data;
+ int len = strnlen(trace->va, trace->len);
+
+ return simple_read_from_buffer(userbuf, count, ppos, trace->va, len);
+}
+
+static int rproc_open_generic(struct inode *inode, struct file *file)
+{
+ file->private_data = inode->i_private;
+
+ return 0;
+}
+
+static const struct file_operations trace_rproc_ops = {
+ .read = rproc_trace_read,
+ .open = rproc_open_generic,
+ .llseek = generic_file_llseek,
+};
+
+/*
+ * A state-to-string lookup table, for exposing a human readable state
+ * via debugfs. Always keep in sync with enum rproc_state
+ */
+static const char * const rproc_state_string[] = {
+ "offline",
+ "suspended",
+ "running",
+ "crashed",
+ "invalid",
+};
+
+/* expose the state of the remote processor via debugfs */
+static ssize_t rproc_state_read(struct file *filp, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct rproc *rproc = filp->private_data;
+ unsigned int state;
+ char buf[30];
+ int i;
+
+ state = rproc->state > RPROC_LAST ? RPROC_LAST : rproc->state;
+
+ i = snprintf(buf, 30, "%.28s (%d)\n", rproc_state_string[state],
+ rproc->state);
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, i);
+}
+
+static const struct file_operations rproc_state_ops = {
+ .read = rproc_state_read,
+ .open = rproc_open_generic,
+ .llseek = generic_file_llseek,
+};
+
+/* expose the name of the remote processor via debugfs */
+static ssize_t rproc_name_read(struct file *filp, char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct rproc *rproc = filp->private_data;
+ /* need room for the name, a newline and a terminating null */
+ char buf[100];
+ int i;
+
+ i = snprintf(buf, sizeof(buf), "%.98s\n", rproc->name);
+
+ return simple_read_from_buffer(userbuf, count, ppos, buf, i);
+}
+
+static const struct file_operations rproc_name_ops = {
+ .read = rproc_name_read,
+ .open = rproc_open_generic,
+ .llseek = generic_file_llseek,
+};
+
+void rproc_remove_trace_file(struct dentry *tfile)
+{
+ debugfs_remove(tfile);
+}
+
+struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
+ struct rproc_mem_entry *trace)
+{
+ struct dentry *tfile;
+
+ tfile = debugfs_create_file(name, 0400, rproc->dbg_dir,
+ trace, &trace_rproc_ops);
+ if (!tfile) {
+ dev_err(rproc->dev, "failed to create debugfs trace entry\n");
+ return NULL;
+ }
+
+ return tfile;
+}
+
+void rproc_delete_debug_dir(struct rproc *rproc)
+{
+ if (!rproc->dbg_dir)
+ return;
+
+ debugfs_remove_recursive(rproc->dbg_dir);
+}
+
+void rproc_create_debug_dir(struct rproc *rproc)
+{
+ struct device *dev = rproc->dev;
+
+ if (!rproc_dbg)
+ return;
+
+ rproc->dbg_dir = debugfs_create_dir(dev_name(dev), rproc_dbg);
+ if (!rproc->dbg_dir)
+ return;
+
+ debugfs_create_file("name", 0400, rproc->dbg_dir,
+ rproc, &rproc_name_ops);
+ debugfs_create_file("state", 0400, rproc->dbg_dir,
+ rproc, &rproc_state_ops);
+}
+
+void __init rproc_init_debugfs(void)
+{
+ if (debugfs_initialized()) {
+ rproc_dbg = debugfs_create_dir(KBUILD_MODNAME, NULL);
+ if (!rproc_dbg)
+ pr_err("can't create debugfs dir\n");
+ }
+}
+
+void __exit rproc_exit_debugfs(void)
+{
+ if (rproc_dbg)
+ debugfs_remove(rproc_dbg);
+}
diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
new file mode 100644
index 000000000000..9f336d6bdef3
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_internal.h
@@ -0,0 +1,44 @@
+/*
+ * Remote processor framework
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef REMOTEPROC_INTERNAL_H
+#define REMOTEPROC_INTERNAL_H
+
+#include <linux/irqreturn.h>
+
+struct rproc;
+
+/* from remoteproc_core.c */
+void rproc_release(struct kref *kref);
+irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
+
+/* from remoteproc_virtio.c */
+int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id);
+void rproc_remove_virtio_dev(struct rproc_vdev *rvdev);
+
+/* from remoteproc_debugfs.c */
+void rproc_remove_trace_file(struct dentry *tfile);
+struct dentry *rproc_create_trace_file(const char *name, struct rproc *rproc,
+ struct rproc_mem_entry *trace);
+void rproc_delete_debug_dir(struct rproc *rproc);
+void rproc_create_debug_dir(struct rproc *rproc);
+void rproc_init_debugfs(void);
+void rproc_exit_debugfs(void);
+
+#endif /* REMOTEPROC_INTERNAL_H */
diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
new file mode 100644
index 000000000000..ecf612130750
--- /dev/null
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -0,0 +1,289 @@
+/*
+ * Remote processor messaging transport (OMAP platform-specific bits)
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/export.h>
+#include <linux/remoteproc.h>
+#include <linux/virtio.h>
+#include <linux/virtio_config.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_ring.h>
+#include <linux/err.h>
+#include <linux/kref.h>
+#include <linux/slab.h>
+
+#include "remoteproc_internal.h"
+
+/* kick the remote processor, and let it know which virtqueue to poke at */
+static void rproc_virtio_notify(struct virtqueue *vq)
+{
+ struct rproc_vring *rvring = vq->priv;
+ struct rproc *rproc = rvring->rvdev->rproc;
+ int notifyid = rvring->notifyid;
+
+ dev_dbg(rproc->dev, "kicking vq index: %d\n", notifyid);
+
+ rproc->ops->kick(rproc, notifyid);
+}
+
+/**
+ * rproc_vq_interrupt() - tell remoteproc that a virtqueue is interrupted
+ * @rproc: handle to the remote processor
+ * @notifyid: index of the signalled virtqueue (unique per this @rproc)
+ *
+ * This function should be called by the platform-specific rproc driver,
+ * when the remote processor signals that a specific virtqueue has pending
+ * messages available.
+ *
+ * Returns IRQ_NONE if no message was found in the @notifyid virtqueue,
+ * and otherwise returns IRQ_HANDLED.
+ */
+irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int notifyid)
+{
+ struct rproc_vring *rvring;
+
+ dev_dbg(rproc->dev, "vq index %d is interrupted\n", notifyid);
+
+ rvring = idr_find(&rproc->notifyids, notifyid);
+ if (!rvring || !rvring->vq)
+ return IRQ_NONE;
+
+ return vring_interrupt(0, rvring->vq);
+}
+EXPORT_SYMBOL(rproc_vq_interrupt);
+
+static struct virtqueue *rp_find_vq(struct virtio_device *vdev,
+ unsigned id,
+ void (*callback)(struct virtqueue *vq),
+ const char *name)
+{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+ struct rproc *rproc = vdev_to_rproc(vdev);
+ struct rproc_vring *rvring;
+ struct virtqueue *vq;
+ void *addr;
+ int len, size;
+
+ /* we're temporarily limited to two virtqueues per rvdev */
+ if (id >= ARRAY_SIZE(rvdev->vring))
+ return ERR_PTR(-EINVAL);
+
+ rvring = &rvdev->vring[id];
+
+ addr = rvring->va;
+ len = rvring->len;
+
+ /* zero vring */
+ size = vring_size(len, rvring->align);
+ memset(addr, 0, size);
+
+ dev_dbg(rproc->dev, "vring%d: va %p qsz %d notifyid %d\n",
+ id, addr, len, rvring->notifyid);
+
+ /*
+ * Create the new vq, and tell virtio we're not interested in
+ * the 'weak' smp barriers, since we're talking with a real device.
+ */
+ vq = vring_new_virtqueue(len, rvring->align, vdev, false, addr,
+ rproc_virtio_notify, callback, name);
+ if (!vq) {
+ dev_err(rproc->dev, "vring_new_virtqueue %s failed\n", name);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ rvring->vq = vq;
+ vq->priv = rvring;
+
+ return vq;
+}
+
+static void rproc_virtio_del_vqs(struct virtio_device *vdev)
+{
+ struct virtqueue *vq, *n;
+ struct rproc *rproc = vdev_to_rproc(vdev);
+ struct rproc_vring *rvring;
+
+ /* power down the remote processor before deleting vqs */
+ rproc_shutdown(rproc);
+
+ list_for_each_entry_safe(vq, n, &vdev->vqs, list) {
+ rvring = vq->priv;
+ rvring->vq = NULL;
+ vring_del_virtqueue(vq);
+ }
+}
+
+static int rproc_virtio_find_vqs(struct virtio_device *vdev, unsigned nvqs,
+ struct virtqueue *vqs[],
+ vq_callback_t *callbacks[],
+ const char *names[])
+{
+ struct rproc *rproc = vdev_to_rproc(vdev);
+ int i, ret;
+
+ for (i = 0; i < nvqs; ++i) {
+ vqs[i] = rp_find_vq(vdev, i, callbacks[i], names[i]);
+ if (IS_ERR(vqs[i])) {
+ ret = PTR_ERR(vqs[i]);
+ goto error;
+ }
+ }
+
+ /* now that the vqs are all set, boot the remote processor */
+ ret = rproc_boot(rproc);
+ if (ret) {
+ dev_err(rproc->dev, "rproc_boot() failed %d\n", ret);
+ goto error;
+ }
+
+ return 0;
+
+error:
+ rproc_virtio_del_vqs(vdev);
+ return ret;
+}
+
+/*
+ * We don't support yet real virtio status semantics.
+ *
+ * The plan is to provide this via the VDEV resource entry
+ * which is part of the firmware: this way the remote processor
+ * will be able to access the status values as set by us.
+ */
+static u8 rproc_virtio_get_status(struct virtio_device *vdev)
+{
+ return 0;
+}
+
+static void rproc_virtio_set_status(struct virtio_device *vdev, u8 status)
+{
+ dev_dbg(&vdev->dev, "status: %d\n", status);
+}
+
+static void rproc_virtio_reset(struct virtio_device *vdev)
+{
+ dev_dbg(&vdev->dev, "reset !\n");
+}
+
+/* provide the vdev features as retrieved from the firmware */
+static u32 rproc_virtio_get_features(struct virtio_device *vdev)
+{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+
+ return rvdev->dfeatures;
+}
+
+static void rproc_virtio_finalize_features(struct virtio_device *vdev)
+{
+ struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
+
+ /* Give virtio_ring a chance to accept features */
+ vring_transport_features(vdev);
+
+ /*
+ * Remember the finalized features of our vdev, and provide it
+ * to the remote processor once it is powered on.
+ *
+ * Similarly to the status field, we don't expose yet the negotiated
+ * features to the remote processors at this point. This will be
+ * fixed as part of a small resource table overhaul and then an
+ * extension of the virtio resource entries.
+ */
+ rvdev->gfeatures = vdev->features[0];
+}
+
+static struct virtio_config_ops rproc_virtio_config_ops = {
+ .get_features = rproc_virtio_get_features,
+ .finalize_features = rproc_virtio_finalize_features,
+ .find_vqs = rproc_virtio_find_vqs,
+ .del_vqs = rproc_virtio_del_vqs,
+ .reset = rproc_virtio_reset,
+ .set_status = rproc_virtio_set_status,
+ .get_status = rproc_virtio_get_status,
+};
+
+/*
+ * This function is called whenever vdev is released, and is responsible
+ * to decrement the remote processor's refcount taken when vdev was
+ * added.
+ *
+ * Never call this function directly; it will be called by the driver
+ * core when needed.
+ */
+static void rproc_vdev_release(struct device *dev)
+{
+ struct virtio_device *vdev = dev_to_virtio(dev);
+ struct rproc *rproc = vdev_to_rproc(vdev);
+
+ kref_put(&rproc->refcount, rproc_release);
+}
+
+/**
+ * rproc_add_virtio_dev() - register an rproc-induced virtio device
+ * @rvdev: the remote vdev
+ *
+ * This function registers a virtio device. This vdev's partent is
+ * the rproc device.
+ *
+ * Returns 0 on success or an appropriate error value otherwise.
+ */
+int rproc_add_virtio_dev(struct rproc_vdev *rvdev, int id)
+{
+ struct rproc *rproc = rvdev->rproc;
+ struct device *dev = rproc->dev;
+ struct virtio_device *vdev = &rvdev->vdev;
+ int ret;
+
+ vdev->id.device = id,
+ vdev->config = &rproc_virtio_config_ops,
+ vdev->dev.parent = dev;
+ vdev->dev.release = rproc_vdev_release;
+
+ /*
+ * We're indirectly making a non-temporary copy of the rproc pointer
+ * here, because drivers probed with this vdev will indirectly
+ * access the wrapping rproc.
+ *
+ * Therefore we must increment the rproc refcount here, and decrement
+ * it _only_ when the vdev is released.
+ */
+ kref_get(&rproc->refcount);
+
+ ret = register_virtio_device(vdev);
+ if (ret) {
+ kref_put(&rproc->refcount, rproc_release);
+ dev_err(dev, "failed to register vdev: %d\n", ret);
+ goto out;
+ }
+
+ dev_info(dev, "registered %s (type %d)\n", dev_name(&vdev->dev), id);
+
+out:
+ return ret;
+}
+
+/**
+ * rproc_remove_virtio_dev() - remove an rproc-induced virtio device
+ * @rvdev: the remote vdev
+ *
+ * This function unregisters an existing virtio device.
+ */
+void rproc_remove_virtio_dev(struct rproc_vdev *rvdev)
+{
+ unregister_virtio_device(&rvdev->vdev);
+}
diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig
new file mode 100644
index 000000000000..32aead65735a
--- /dev/null
+++ b/drivers/rpmsg/Kconfig
@@ -0,0 +1,10 @@
+menu "Rpmsg drivers (EXPERIMENTAL)"
+
+# RPMSG always gets selected by whoever wants it
+config RPMSG
+ tristate
+ select VIRTIO
+ select VIRTIO_RING
+ depends on EXPERIMENTAL
+
+endmenu
diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile
new file mode 100644
index 000000000000..7617fcb8259f
--- /dev/null
+++ b/drivers/rpmsg/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_RPMSG) += virtio_rpmsg_bus.o
diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
new file mode 100644
index 000000000000..75506ec2840e
--- /dev/null
+++ b/drivers/rpmsg/virtio_rpmsg_bus.c
@@ -0,0 +1,1054 @@
+/*
+ * Virtio-based remote processor messaging bus
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Ohad Ben-Cohen <ohad@wizery.com>
+ * Brian Swetland <swetland@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) "%s: " fmt, __func__
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/virtio.h>
+#include <linux/virtio_ids.h>
+#include <linux/virtio_config.h>
+#include <linux/scatterlist.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/idr.h>
+#include <linux/jiffies.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/rpmsg.h>
+#include <linux/mutex.h>
+
+/**
+ * struct virtproc_info - virtual remote processor state
+ * @vdev: the virtio device
+ * @rvq: rx virtqueue
+ * @svq: tx virtqueue
+ * @rbufs: kernel address of rx buffers
+ * @sbufs: kernel address of tx buffers
+ * @last_sbuf: index of last tx buffer used
+ * @bufs_dma: dma base addr of the buffers
+ * @tx_lock: protects svq, sbufs and sleepers, to allow concurrent senders.
+ * sending a message might require waking up a dozing remote
+ * processor, which involves sleeping, hence the mutex.
+ * @endpoints: idr of local endpoints, allows fast retrieval
+ * @endpoints_lock: lock of the endpoints set
+ * @sendq: wait queue of sending contexts waiting for a tx buffers
+ * @sleepers: number of senders that are waiting for a tx buffer
+ * @ns_ept: the bus's name service endpoint
+ *
+ * This structure stores the rpmsg state of a given virtio remote processor
+ * device (there might be several virtio proc devices for each physical
+ * remote processor).
+ */
+struct virtproc_info {
+ struct virtio_device *vdev;
+ struct virtqueue *rvq, *svq;
+ void *rbufs, *sbufs;
+ int last_sbuf;
+ dma_addr_t bufs_dma;
+ struct mutex tx_lock;
+ struct idr endpoints;
+ struct mutex endpoints_lock;
+ wait_queue_head_t sendq;
+ atomic_t sleepers;
+ struct rpmsg_endpoint *ns_ept;
+};
+
+/**
+ * struct rpmsg_channel_info - internal channel info representation
+ * @name: name of service
+ * @src: local address
+ * @dst: destination address
+ */
+struct rpmsg_channel_info {
+ char name[RPMSG_NAME_SIZE];
+ u32 src;
+ u32 dst;
+};
+
+#define to_rpmsg_channel(d) container_of(d, struct rpmsg_channel, dev)
+#define to_rpmsg_driver(d) container_of(d, struct rpmsg_driver, drv)
+
+/*
+ * We're allocating 512 buffers of 512 bytes for communications, and then
+ * using the first 256 buffers for RX, and the last 256 buffers for TX.
+ *
+ * Each buffer will have 16 bytes for the msg header and 496 bytes for
+ * the payload.
+ *
+ * This will require a total space of 256KB for the buffers.
+ *
+ * We might also want to add support for user-provided buffers in time.
+ * This will allow bigger buffer size flexibility, and can also be used
+ * to achieve zero-copy messaging.
+ *
+ * Note that these numbers are purely a decision of this driver - we
+ * can change this without changing anything in the firmware of the remote
+ * processor.
+ */
+#define RPMSG_NUM_BUFS (512)
+#define RPMSG_BUF_SIZE (512)
+#define RPMSG_TOTAL_BUF_SPACE (RPMSG_NUM_BUFS * RPMSG_BUF_SIZE)
+
+/*
+ * Local addresses are dynamically allocated on-demand.
+ * We do not dynamically assign addresses from the low 1024 range,
+ * in order to reserve that address range for predefined services.
+ */
+#define RPMSG_RESERVED_ADDRESSES (1024)
+
+/* Address 53 is reserved for advertising remote services */
+#define RPMSG_NS_ADDR (53)
+
+/* sysfs show configuration fields */
+#define rpmsg_show_attr(field, path, format_string) \
+static ssize_t \
+field##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev); \
+ \
+ return sprintf(buf, format_string, rpdev->path); \
+}
+
+/* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */
+rpmsg_show_attr(name, id.name, "%s\n");
+rpmsg_show_attr(src, src, "0x%x\n");
+rpmsg_show_attr(dst, dst, "0x%x\n");
+rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n");
+
+/*
+ * Unique (and free running) index for rpmsg devices.
+ *
+ * Yeah, we're not recycling those numbers (yet?). will be easy
+ * to change if/when we want to.
+ */
+static unsigned int rpmsg_dev_index;
+
+static ssize_t modalias_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+
+ return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name);
+}
+
+static struct device_attribute rpmsg_dev_attrs[] = {
+ __ATTR_RO(name),
+ __ATTR_RO(modalias),
+ __ATTR_RO(dst),
+ __ATTR_RO(src),
+ __ATTR_RO(announce),
+ __ATTR_NULL
+};
+
+/* rpmsg devices and drivers are matched using the service name */
+static inline int rpmsg_id_match(const struct rpmsg_channel *rpdev,
+ const struct rpmsg_device_id *id)
+{
+ return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0;
+}
+
+/* match rpmsg channel and rpmsg driver */
+static int rpmsg_dev_match(struct device *dev, struct device_driver *drv)
+{
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+ struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv);
+ const struct rpmsg_device_id *ids = rpdrv->id_table;
+ unsigned int i;
+
+ for (i = 0; ids[i].name[0]; i++)
+ if (rpmsg_id_match(rpdev, &ids[i]))
+ return 1;
+
+ return 0;
+}
+
+static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+
+ return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT,
+ rpdev->id.name);
+}
+
+/* for more info, see below documentation of rpmsg_create_ept() */
+static struct rpmsg_endpoint *__rpmsg_create_ept(struct virtproc_info *vrp,
+ struct rpmsg_channel *rpdev, rpmsg_rx_cb_t cb,
+ void *priv, u32 addr)
+{
+ int err, tmpaddr, request;
+ struct rpmsg_endpoint *ept;
+ struct device *dev = rpdev ? &rpdev->dev : &vrp->vdev->dev;
+
+ if (!idr_pre_get(&vrp->endpoints, GFP_KERNEL))
+ return NULL;
+
+ ept = kzalloc(sizeof(*ept), GFP_KERNEL);
+ if (!ept) {
+ dev_err(dev, "failed to kzalloc a new ept\n");
+ return NULL;
+ }
+
+ ept->rpdev = rpdev;
+ ept->cb = cb;
+ ept->priv = priv;
+
+ /* do we need to allocate a local address ? */
+ request = addr == RPMSG_ADDR_ANY ? RPMSG_RESERVED_ADDRESSES : addr;
+
+ mutex_lock(&vrp->endpoints_lock);
+
+ /* bind the endpoint to an rpmsg address (and allocate one if needed) */
+ err = idr_get_new_above(&vrp->endpoints, ept, request, &tmpaddr);
+ if (err) {
+ dev_err(dev, "idr_get_new_above failed: %d\n", err);
+ goto free_ept;
+ }
+
+ /* make sure the user's address request is fulfilled, if relevant */
+ if (addr != RPMSG_ADDR_ANY && tmpaddr != addr) {
+ dev_err(dev, "address 0x%x already in use\n", addr);
+ goto rem_idr;
+ }
+
+ ept->addr = tmpaddr;
+
+ mutex_unlock(&vrp->endpoints_lock);
+
+ return ept;
+
+rem_idr:
+ idr_remove(&vrp->endpoints, request);
+free_ept:
+ mutex_unlock(&vrp->endpoints_lock);
+ kfree(ept);
+ return NULL;
+}
+
+/**
+ * rpmsg_create_ept() - create a new rpmsg_endpoint
+ * @rpdev: rpmsg channel device
+ * @cb: rx callback handler
+ * @priv: private data for the driver's use
+ * @addr: local rpmsg address to bind with @cb
+ *
+ * Every rpmsg address in the system is bound to an rx callback (so when
+ * inbound messages arrive, they are dispatched by the rpmsg bus using the
+ * appropriate callback handler) by means of an rpmsg_endpoint struct.
+ *
+ * This function allows drivers to create such an endpoint, and by that,
+ * bind a callback, and possibly some private data too, to an rpmsg address
+ * (either one that is known in advance, or one that will be dynamically
+ * assigned for them).
+ *
+ * Simple rpmsg drivers need not call rpmsg_create_ept, because an endpoint
+ * is already created for them when they are probed by the rpmsg bus
+ * (using the rx callback provided when they registered to the rpmsg bus).
+ *
+ * So things should just work for simple drivers: they already have an
+ * endpoint, their rx callback is bound to their rpmsg address, and when
+ * relevant inbound messages arrive (i.e. messages which their dst address
+ * equals to the src address of their rpmsg channel), the driver's handler
+ * is invoked to process it.
+ *
+ * That said, more complicated drivers might do need to allocate
+ * additional rpmsg addresses, and bind them to different rx callbacks.
+ * To accomplish that, those drivers need to call this function.
+ *
+ * Drivers should provide their @rpdev channel (so the new endpoint would belong
+ * to the same remote processor their channel belongs to), an rx callback
+ * function, an optional private data (which is provided back when the
+ * rx callback is invoked), and an address they want to bind with the
+ * callback. If @addr is RPMSG_ADDR_ANY, then rpmsg_create_ept will
+ * dynamically assign them an available rpmsg address (drivers should have
+ * a very good reason why not to always use RPMSG_ADDR_ANY here).
+ *
+ * Returns a pointer to the endpoint on success, or NULL on error.
+ */
+struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_channel *rpdev,
+ rpmsg_rx_cb_t cb, void *priv, u32 addr)
+{
+ return __rpmsg_create_ept(rpdev->vrp, rpdev, cb, priv, addr);
+}
+EXPORT_SYMBOL(rpmsg_create_ept);
+
+/**
+ * __rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
+ * @vrp: virtproc which owns this ept
+ * @ept: endpoing to destroy
+ *
+ * An internal function which destroy an ept without assuming it is
+ * bound to an rpmsg channel. This is needed for handling the internal
+ * name service endpoint, which isn't bound to an rpmsg channel.
+ * See also __rpmsg_create_ept().
+ */
+static void
+__rpmsg_destroy_ept(struct virtproc_info *vrp, struct rpmsg_endpoint *ept)
+{
+ mutex_lock(&vrp->endpoints_lock);
+ idr_remove(&vrp->endpoints, ept->addr);
+ mutex_unlock(&vrp->endpoints_lock);
+
+ kfree(ept);
+}
+
+/**
+ * rpmsg_destroy_ept() - destroy an existing rpmsg endpoint
+ * @ept: endpoing to destroy
+ *
+ * Should be used by drivers to destroy an rpmsg endpoint previously
+ * created with rpmsg_create_ept().
+ */
+void rpmsg_destroy_ept(struct rpmsg_endpoint *ept)
+{
+ __rpmsg_destroy_ept(ept->rpdev->vrp, ept);
+}
+EXPORT_SYMBOL(rpmsg_destroy_ept);
+
+/*
+ * when an rpmsg driver is probed with a channel, we seamlessly create
+ * it an endpoint, binding its rx callback to a unique local rpmsg
+ * address.
+ *
+ * if we need to, we also announce about this channel to the remote
+ * processor (needed in case the driver is exposing an rpmsg service).
+ */
+static int rpmsg_dev_probe(struct device *dev)
+{
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+ struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
+ struct virtproc_info *vrp = rpdev->vrp;
+ struct rpmsg_endpoint *ept;
+ int err;
+
+ ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, rpdev->src);
+ if (!ept) {
+ dev_err(dev, "failed to create endpoint\n");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ rpdev->ept = ept;
+ rpdev->src = ept->addr;
+
+ err = rpdrv->probe(rpdev);
+ if (err) {
+ dev_err(dev, "%s: failed: %d\n", __func__, err);
+ rpmsg_destroy_ept(ept);
+ goto out;
+ }
+
+ /* need to tell remote processor's name service about this channel ? */
+ if (rpdev->announce &&
+ virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
+ struct rpmsg_ns_msg nsm;
+
+ strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
+ nsm.addr = rpdev->src;
+ nsm.flags = RPMSG_NS_CREATE;
+
+ err = rpmsg_sendto(rpdev, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
+ if (err)
+ dev_err(dev, "failed to announce service %d\n", err);
+ }
+
+out:
+ return err;
+}
+
+static int rpmsg_dev_remove(struct device *dev)
+{
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+ struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver);
+ struct virtproc_info *vrp = rpdev->vrp;
+ int err = 0;
+
+ /* tell remote processor's name service we're removing this channel */
+ if (rpdev->announce &&
+ virtio_has_feature(vrp->vdev, VIRTIO_RPMSG_F_NS)) {
+ struct rpmsg_ns_msg nsm;
+
+ strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
+ nsm.addr = rpdev->src;
+ nsm.flags = RPMSG_NS_DESTROY;
+
+ err = rpmsg_sendto(rpdev, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
+ if (err)
+ dev_err(dev, "failed to announce service %d\n", err);
+ }
+
+ rpdrv->remove(rpdev);
+
+ rpmsg_destroy_ept(rpdev->ept);
+
+ return err;
+}
+
+static struct bus_type rpmsg_bus = {
+ .name = "rpmsg",
+ .match = rpmsg_dev_match,
+ .dev_attrs = rpmsg_dev_attrs,
+ .uevent = rpmsg_uevent,
+ .probe = rpmsg_dev_probe,
+ .remove = rpmsg_dev_remove,
+};
+
+/**
+ * register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus
+ * @rpdrv: pointer to a struct rpmsg_driver
+ *
+ * Returns 0 on success, and an appropriate error value on failure.
+ */
+int register_rpmsg_driver(struct rpmsg_driver *rpdrv)
+{
+ rpdrv->drv.bus = &rpmsg_bus;
+ return driver_register(&rpdrv->drv);
+}
+EXPORT_SYMBOL(register_rpmsg_driver);
+
+/**
+ * unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus
+ * @rpdrv: pointer to a struct rpmsg_driver
+ *
+ * Returns 0 on success, and an appropriate error value on failure.
+ */
+void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv)
+{
+ driver_unregister(&rpdrv->drv);
+}
+EXPORT_SYMBOL(unregister_rpmsg_driver);
+
+static void rpmsg_release_device(struct device *dev)
+{
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+
+ kfree(rpdev);
+}
+
+/*
+ * match an rpmsg channel with a channel info struct.
+ * this is used to make sure we're not creating rpmsg devices for channels
+ * that already exist.
+ */
+static int rpmsg_channel_match(struct device *dev, void *data)
+{
+ struct rpmsg_channel_info *chinfo = data;
+ struct rpmsg_channel *rpdev = to_rpmsg_channel(dev);
+
+ if (chinfo->src != RPMSG_ADDR_ANY && chinfo->src != rpdev->src)
+ return 0;
+
+ if (chinfo->dst != RPMSG_ADDR_ANY && chinfo->dst != rpdev->dst)
+ return 0;
+
+ if (strncmp(chinfo->name, rpdev->id.name, RPMSG_NAME_SIZE))
+ return 0;
+
+ /* found a match ! */
+ return 1;
+}
+
+/*
+ * create an rpmsg channel using its name and address info.
+ * this function will be used to create both static and dynamic
+ * channels.
+ */
+static struct rpmsg_channel *rpmsg_create_channel(struct virtproc_info *vrp,
+ struct rpmsg_channel_info *chinfo)
+{
+ struct rpmsg_channel *rpdev;
+ struct device *tmp, *dev = &vrp->vdev->dev;
+ int ret;
+
+ /* make sure a similar channel doesn't already exist */
+ tmp = device_find_child(dev, chinfo, rpmsg_channel_match);
+ if (tmp) {
+ /* decrement the matched device's refcount back */
+ put_device(tmp);
+ dev_err(dev, "channel %s:%x:%x already exist\n",
+ chinfo->name, chinfo->src, chinfo->dst);
+ return NULL;
+ }
+
+ rpdev = kzalloc(sizeof(struct rpmsg_channel), GFP_KERNEL);
+ if (!rpdev) {
+ pr_err("kzalloc failed\n");
+ return NULL;
+ }
+
+ rpdev->vrp = vrp;
+ rpdev->src = chinfo->src;
+ rpdev->dst = chinfo->dst;
+
+ /*
+ * rpmsg server channels has predefined local address (for now),
+ * and their existence needs to be announced remotely
+ */
+ rpdev->announce = rpdev->src != RPMSG_ADDR_ANY ? true : false;
+
+ strncpy(rpdev->id.name, chinfo->name, RPMSG_NAME_SIZE);
+
+ /* very simple device indexing plumbing which is enough for now */
+ dev_set_name(&rpdev->dev, "rpmsg%d", rpmsg_dev_index++);
+
+ rpdev->dev.parent = &vrp->vdev->dev;
+ rpdev->dev.bus = &rpmsg_bus;
+ rpdev->dev.release = rpmsg_release_device;
+
+ ret = device_register(&rpdev->dev);
+ if (ret) {
+ dev_err(dev, "device_register failed: %d\n", ret);
+ put_device(&rpdev->dev);
+ return NULL;
+ }
+
+ return rpdev;
+}
+
+/*
+ * find an existing channel using its name + address properties,
+ * and destroy it
+ */
+static int rpmsg_destroy_channel(struct virtproc_info *vrp,
+ struct rpmsg_channel_info *chinfo)
+{
+ struct virtio_device *vdev = vrp->vdev;
+ struct device *dev;
+
+ dev = device_find_child(&vdev->dev, chinfo, rpmsg_channel_match);
+ if (!dev)
+ return -EINVAL;
+
+ device_unregister(dev);
+
+ put_device(dev);
+
+ return 0;
+}
+
+/* super simple buffer "allocator" that is just enough for now */
+static void *get_a_tx_buf(struct virtproc_info *vrp)
+{
+ unsigned int len;
+ void *ret;
+
+ /* support multiple concurrent senders */
+ mutex_lock(&vrp->tx_lock);
+
+ /*
+ * either pick the next unused tx buffer
+ * (half of our buffers are used for sending messages)
+ */
+ if (vrp->last_sbuf < RPMSG_NUM_BUFS / 2)
+ ret = vrp->sbufs + RPMSG_BUF_SIZE * vrp->last_sbuf++;
+ /* or recycle a used one */
+ else
+ ret = virtqueue_get_buf(vrp->svq, &len);
+
+ mutex_unlock(&vrp->tx_lock);
+
+ return ret;
+}
+
+/**
+ * rpmsg_upref_sleepers() - enable "tx-complete" interrupts, if needed
+ * @vrp: virtual remote processor state
+ *
+ * This function is called before a sender is blocked, waiting for
+ * a tx buffer to become available.
+ *
+ * If we already have blocking senders, this function merely increases
+ * the "sleepers" reference count, and exits.
+ *
+ * Otherwise, if this is the first sender to block, we also enable
+ * virtio's tx callbacks, so we'd be immediately notified when a tx
+ * buffer is consumed (we rely on virtio's tx callback in order
+ * to wake up sleeping senders as soon as a tx buffer is used by the
+ * remote processor).
+ */
+static void rpmsg_upref_sleepers(struct virtproc_info *vrp)
+{
+ /* support multiple concurrent senders */
+ mutex_lock(&vrp->tx_lock);
+
+ /* are we the first sleeping context waiting for tx buffers ? */
+ if (atomic_inc_return(&vrp->sleepers) == 1)
+ /* enable "tx-complete" interrupts before dozing off */
+ virtqueue_enable_cb(vrp->svq);
+
+ mutex_unlock(&vrp->tx_lock);
+}
+
+/**
+ * rpmsg_downref_sleepers() - disable "tx-complete" interrupts, if needed
+ * @vrp: virtual remote processor state
+ *
+ * This function is called after a sender, that waited for a tx buffer
+ * to become available, is unblocked.
+ *
+ * If we still have blocking senders, this function merely decreases
+ * the "sleepers" reference count, and exits.
+ *
+ * Otherwise, if there are no more blocking senders, we also disable
+ * virtio's tx callbacks, to avoid the overhead incurred with handling
+ * those (now redundant) interrupts.
+ */
+static void rpmsg_downref_sleepers(struct virtproc_info *vrp)
+{
+ /* support multiple concurrent senders */
+ mutex_lock(&vrp->tx_lock);
+
+ /* are we the last sleeping context waiting for tx buffers ? */
+ if (atomic_dec_and_test(&vrp->sleepers))
+ /* disable "tx-complete" interrupts */
+ virtqueue_disable_cb(vrp->svq);
+
+ mutex_unlock(&vrp->tx_lock);
+}
+
+/**
+ * rpmsg_send_offchannel_raw() - send a message across to the remote processor
+ * @rpdev: the rpmsg channel
+ * @src: source address
+ * @dst: destination address
+ * @data: payload of message
+ * @len: length of payload
+ * @wait: indicates whether caller should block in case no TX buffers available
+ *
+ * This function is the base implementation for all of the rpmsg sending API.
+ *
+ * It will send @data of length @len to @dst, and say it's from @src. The
+ * message will be sent to the remote processor which the @rpdev channel
+ * belongs to.
+ *
+ * The message is sent using one of the TX buffers that are available for
+ * communication with this remote processor.
+ *
+ * If @wait is true, the caller will be blocked until either a TX buffer is
+ * available, or 15 seconds elapses (we don't want callers to
+ * sleep indefinitely due to misbehaving remote processors), and in that
+ * case -ERESTARTSYS is returned. The number '15' itself was picked
+ * arbitrarily; there's little point in asking drivers to provide a timeout
+ * value themselves.
+ *
+ * Otherwise, if @wait is false, and there are no TX buffers available,
+ * the function will immediately fail, and -ENOMEM will be returned.
+ *
+ * Normally drivers shouldn't use this function directly; instead, drivers
+ * should use the appropriate rpmsg_{try}send{to, _offchannel} API
+ * (see include/linux/rpmsg.h).
+ *
+ * Returns 0 on success and an appropriate error value on failure.
+ */
+int rpmsg_send_offchannel_raw(struct rpmsg_channel *rpdev, u32 src, u32 dst,
+ void *data, int len, bool wait)
+{
+ struct virtproc_info *vrp = rpdev->vrp;
+ struct device *dev = &rpdev->dev;
+ struct scatterlist sg;
+ struct rpmsg_hdr *msg;
+ int err;
+
+ /* bcasting isn't allowed */
+ if (src == RPMSG_ADDR_ANY || dst == RPMSG_ADDR_ANY) {
+ dev_err(dev, "invalid addr (src 0x%x, dst 0x%x)\n", src, dst);
+ return -EINVAL;
+ }
+
+ /*
+ * We currently use fixed-sized buffers, and therefore the payload
+ * length is limited.
+ *
+ * One of the possible improvements here is either to support
+ * user-provided buffers (and then we can also support zero-copy
+ * messaging), or to improve the buffer allocator, to support
+ * variable-length buffer sizes.
+ */
+ if (len > RPMSG_BUF_SIZE - sizeof(struct rpmsg_hdr)) {
+ dev_err(dev, "message is too big (%d)\n", len);
+ return -EMSGSIZE;
+ }
+
+ /* grab a buffer */
+ msg = get_a_tx_buf(vrp);
+ if (!msg && !wait)
+ return -ENOMEM;
+
+ /* no free buffer ? wait for one (but bail after 15 seconds) */
+ while (!msg) {
+ /* enable "tx-complete" interrupts, if not already enabled */
+ rpmsg_upref_sleepers(vrp);
+
+ /*
+ * sleep until a free buffer is available or 15 secs elapse.
+ * the timeout period is not configurable because there's
+ * little point in asking drivers to specify that.
+ * if later this happens to be required, it'd be easy to add.
+ */
+ err = wait_event_interruptible_timeout(vrp->sendq,
+ (msg = get_a_tx_buf(vrp)),
+ msecs_to_jiffies(15000));
+
+ /* disable "tx-complete" interrupts if we're the last sleeper */
+ rpmsg_downref_sleepers(vrp);
+
+ /* timeout ? */
+ if (!err) {
+ dev_err(dev, "timeout waiting for a tx buffer\n");
+ return -ERESTARTSYS;
+ }
+ }
+
+ msg->len = len;
+ msg->flags = 0;
+ msg->src = src;
+ msg->dst = dst;
+ msg->reserved = 0;
+ memcpy(msg->data, data, len);
+
+ dev_dbg(dev, "TX From 0x%x, To 0x%x, Len %d, Flags %d, Reserved %d\n",
+ msg->src, msg->dst, msg->len,
+ msg->flags, msg->reserved);
+ print_hex_dump(KERN_DEBUG, "rpmsg_virtio TX: ", DUMP_PREFIX_NONE, 16, 1,
+ msg, sizeof(*msg) + msg->len, true);
+
+ sg_init_one(&sg, msg, sizeof(*msg) + len);
+
+ mutex_lock(&vrp->tx_lock);
+
+ /* add message to the remote processor's virtqueue */
+ err = virtqueue_add_buf(vrp->svq, &sg, 1, 0, msg, GFP_KERNEL);
+ if (err < 0) {
+ /*
+ * need to reclaim the buffer here, otherwise it's lost
+ * (memory won't leak, but rpmsg won't use it again for TX).
+ * this will wait for a buffer management overhaul.
+ */
+ dev_err(dev, "virtqueue_add_buf failed: %d\n", err);
+ goto out;
+ }
+
+ /* tell the remote processor it has a pending message to read */
+ virtqueue_kick(vrp->svq);
+
+ err = 0;
+out:
+ mutex_unlock(&vrp->tx_lock);
+ return err;
+}
+EXPORT_SYMBOL(rpmsg_send_offchannel_raw);
+
+/* called when an rx buffer is used, and it's time to digest a message */
+static void rpmsg_recv_done(struct virtqueue *rvq)
+{
+ struct rpmsg_hdr *msg;
+ unsigned int len;
+ struct rpmsg_endpoint *ept;
+ struct scatterlist sg;
+ struct virtproc_info *vrp = rvq->vdev->priv;
+ struct device *dev = &rvq->vdev->dev;
+ int err;
+
+ msg = virtqueue_get_buf(rvq, &len);
+ if (!msg) {
+ dev_err(dev, "uhm, incoming signal, but no used buffer ?\n");
+ return;
+ }
+
+ dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n",
+ msg->src, msg->dst, msg->len,
+ msg->flags, msg->reserved);
+ print_hex_dump(KERN_DEBUG, "rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
+ msg, sizeof(*msg) + msg->len, true);
+
+ /*
+ * We currently use fixed-sized buffers, so trivially sanitize
+ * the reported payload length.
+ */
+ if (len > RPMSG_BUF_SIZE ||
+ msg->len > (len - sizeof(struct rpmsg_hdr))) {
+ dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
+ return;
+ }
+
+ /* use the dst addr to fetch the callback of the appropriate user */
+ mutex_lock(&vrp->endpoints_lock);
+ ept = idr_find(&vrp->endpoints, msg->dst);
+ mutex_unlock(&vrp->endpoints_lock);
+
+ if (ept && ept->cb)
+ ept->cb(ept->rpdev, msg->data, msg->len, ept->priv, msg->src);
+ else
+ dev_warn(dev, "msg received with no recepient\n");
+
+ /* publish the real size of the buffer */
+ sg_init_one(&sg, msg, RPMSG_BUF_SIZE);
+
+ /* add the buffer back to the remote processor's virtqueue */
+ err = virtqueue_add_buf(vrp->rvq, &sg, 0, 1, msg, GFP_KERNEL);
+ if (err < 0) {
+ dev_err(dev, "failed to add a virtqueue buffer: %d\n", err);
+ return;
+ }
+
+ /* tell the remote processor we added another available rx buffer */
+ virtqueue_kick(vrp->rvq);
+}
+
+/*
+ * This is invoked whenever the remote processor completed processing
+ * a TX msg we just sent it, and the buffer is put back to the used ring.
+ *
+ * Normally, though, we suppress this "tx complete" interrupt in order to
+ * avoid the incurred overhead.
+ */
+static void rpmsg_xmit_done(struct virtqueue *svq)
+{
+ struct virtproc_info *vrp = svq->vdev->priv;
+
+ dev_dbg(&svq->vdev->dev, "%s\n", __func__);
+
+ /* wake up potential senders that are waiting for a tx buffer */
+ wake_up_interruptible(&vrp->sendq);
+}
+
+/* invoked when a name service announcement arrives */
+static void rpmsg_ns_cb(struct rpmsg_channel *rpdev, void *data, int len,
+ void *priv, u32 src)
+{
+ struct rpmsg_ns_msg *msg = data;
+ struct rpmsg_channel *newch;
+ struct rpmsg_channel_info chinfo;
+ struct virtproc_info *vrp = priv;
+ struct device *dev = &vrp->vdev->dev;
+ int ret;
+
+ print_hex_dump(KERN_DEBUG, "NS announcement: ",
+ DUMP_PREFIX_NONE, 16, 1,
+ data, len, true);
+
+ if (len != sizeof(*msg)) {
+ dev_err(dev, "malformed ns msg (%d)\n", len);
+ return;
+ }
+
+ /*
+ * the name service ept does _not_ belong to a real rpmsg channel,
+ * and is handled by the rpmsg bus itself.
+ * for sanity reasons, make sure a valid rpdev has _not_ sneaked
+ * in somehow.
+ */
+ if (rpdev) {
+ dev_err(dev, "anomaly: ns ept has an rpdev handle\n");
+ return;
+ }
+
+ /* don't trust the remote processor for null terminating the name */
+ msg->name[RPMSG_NAME_SIZE - 1] = '\0';
+
+ dev_info(dev, "%sing channel %s addr 0x%x\n",
+ msg->flags & RPMSG_NS_DESTROY ? "destroy" : "creat",
+ msg->name, msg->addr);
+
+ strncpy(chinfo.name, msg->name, sizeof(chinfo.name));
+ chinfo.src = RPMSG_ADDR_ANY;
+ chinfo.dst = msg->addr;
+
+ if (msg->flags & RPMSG_NS_DESTROY) {
+ ret = rpmsg_destroy_channel(vrp, &chinfo);
+ if (ret)
+ dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
+ } else {
+ newch = rpmsg_create_channel(vrp, &chinfo);
+ if (!newch)
+ dev_err(dev, "rpmsg_create_channel failed\n");
+ }
+}
+
+static int rpmsg_probe(struct virtio_device *vdev)
+{
+ vq_callback_t *vq_cbs[] = { rpmsg_recv_done, rpmsg_xmit_done };
+ const char *names[] = { "input", "output" };
+ struct virtqueue *vqs[2];
+ struct virtproc_info *vrp;
+ void *bufs_va;
+ int err = 0, i;
+
+ vrp = kzalloc(sizeof(*vrp), GFP_KERNEL);
+ if (!vrp)
+ return -ENOMEM;
+
+ vrp->vdev = vdev;
+
+ idr_init(&vrp->endpoints);
+ mutex_init(&vrp->endpoints_lock);
+ mutex_init(&vrp->tx_lock);
+ init_waitqueue_head(&vrp->sendq);
+
+ /* We expect two virtqueues, rx and tx (and in this order) */
+ err = vdev->config->find_vqs(vdev, 2, vqs, vq_cbs, names);
+ if (err)
+ goto free_vrp;
+
+ vrp->rvq = vqs[0];
+ vrp->svq = vqs[1];
+
+ /* allocate coherent memory for the buffers */
+ bufs_va = dma_alloc_coherent(vdev->dev.parent, RPMSG_TOTAL_BUF_SPACE,
+ &vrp->bufs_dma, GFP_KERNEL);
+ if (!bufs_va)
+ goto vqs_del;
+
+ dev_dbg(&vdev->dev, "buffers: va %p, dma 0x%llx\n", bufs_va,
+ (unsigned long long)vrp->bufs_dma);
+
+ /* half of the buffers is dedicated for RX */
+ vrp->rbufs = bufs_va;
+
+ /* and half is dedicated for TX */
+ vrp->sbufs = bufs_va + RPMSG_TOTAL_BUF_SPACE / 2;
+
+ /* set up the receive buffers */
+ for (i = 0; i < RPMSG_NUM_BUFS / 2; i++) {
+ struct scatterlist sg;
+ void *cpu_addr = vrp->rbufs + i * RPMSG_BUF_SIZE;
+
+ sg_init_one(&sg, cpu_addr, RPMSG_BUF_SIZE);
+
+ err = virtqueue_add_buf(vrp->rvq, &sg, 0, 1, cpu_addr,
+ GFP_KERNEL);
+ WARN_ON(err < 0); /* sanity check; this can't really happen */
+ }
+
+ /* suppress "tx-complete" interrupts */
+ virtqueue_disable_cb(vrp->svq);
+
+ vdev->priv = vrp;
+
+ /* if supported by the remote processor, enable the name service */
+ if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_NS)) {
+ /* a dedicated endpoint handles the name service msgs */
+ vrp->ns_ept = __rpmsg_create_ept(vrp, NULL, rpmsg_ns_cb,
+ vrp, RPMSG_NS_ADDR);
+ if (!vrp->ns_ept) {
+ dev_err(&vdev->dev, "failed to create the ns ept\n");
+ err = -ENOMEM;
+ goto free_coherent;
+ }
+ }
+
+ /* tell the remote processor it can start sending messages */
+ virtqueue_kick(vrp->rvq);
+
+ dev_info(&vdev->dev, "rpmsg host is online\n");
+
+ return 0;
+
+free_coherent:
+ dma_free_coherent(vdev->dev.parent, RPMSG_TOTAL_BUF_SPACE, bufs_va,
+ vrp->bufs_dma);
+vqs_del:
+ vdev->config->del_vqs(vrp->vdev);
+free_vrp:
+ kfree(vrp);
+ return err;
+}
+
+static int rpmsg_remove_device(struct device *dev, void *data)
+{
+ device_unregister(dev);
+
+ return 0;
+}
+
+static void __devexit rpmsg_remove(struct virtio_device *vdev)
+{
+ struct virtproc_info *vrp = vdev->priv;
+ int ret;
+
+ vdev->config->reset(vdev);
+
+ ret = device_for_each_child(&vdev->dev, NULL, rpmsg_remove_device);
+ if (ret)
+ dev_warn(&vdev->dev, "can't remove rpmsg device: %d\n", ret);
+
+ if (vrp->ns_ept)
+ __rpmsg_destroy_ept(vrp, vrp->ns_ept);
+
+ idr_remove_all(&vrp->endpoints);
+ idr_destroy(&vrp->endpoints);
+
+ vdev->config->del_vqs(vrp->vdev);
+
+ dma_free_coherent(vdev->dev.parent, RPMSG_TOTAL_BUF_SPACE,
+ vrp->rbufs, vrp->bufs_dma);
+
+ kfree(vrp);
+}
+
+static struct virtio_device_id id_table[] = {
+ { VIRTIO_ID_RPMSG, VIRTIO_DEV_ANY_ID },
+ { 0 },
+};
+
+static unsigned int features[] = {
+ VIRTIO_RPMSG_F_NS,
+};
+
+static struct virtio_driver virtio_ipc_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
+ .driver.name = KBUILD_MODNAME,
+ .driver.owner = THIS_MODULE,
+ .id_table = id_table,
+ .probe = rpmsg_probe,
+ .remove = __devexit_p(rpmsg_remove),
+};
+
+static int __init rpmsg_init(void)
+{
+ int ret;
+
+ ret = bus_register(&rpmsg_bus);
+ if (ret) {
+ pr_err("failed to register rpmsg bus: %d\n", ret);
+ return ret;
+ }
+
+ ret = register_virtio_driver(&virtio_ipc_driver);
+ if (ret) {
+ pr_err("failed to register virtio driver: %d\n", ret);
+ bus_unregister(&rpmsg_bus);
+ }
+
+ return ret;
+}
+module_init(rpmsg_init);
+
+static void __exit rpmsg_fini(void)
+{
+ unregister_virtio_driver(&virtio_ipc_driver);
+ bus_unregister(&rpmsg_bus);
+}
+module_exit(rpmsg_fini);
+
+MODULE_DEVICE_TABLE(virtio, id_table);
+MODULE_DESCRIPTION("Virtio-based remote processor messaging bus");
+MODULE_LICENSE("GPL v2");