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authorVolodymyr Babchuk <vlad.babchuk@gmail.com>2017-11-29 14:48:35 +0200
committerJens Wiklander <jens.wiklander@linaro.org>2017-12-15 13:36:17 +0100
commitabd135ba215c05ca84f9809e6047db25fc28b835 (patch)
treefafdd4a10f60ecc4145eb63d16719c4f936740de /drivers/tee
parentd885cc5e0759fc19badadddb60a64344b551469b (diff)
downloadlinux-abd135ba215c05ca84f9809e6047db25fc28b835.tar.bz2
tee: optee: add optee-specific shared pool implementation
This is simple pool that uses kernel page allocator. This pool can be used in case OP-TEE supports dynamic shared memory. Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
-rw-r--r--drivers/tee/optee/Makefile1
-rw-r--r--drivers/tee/optee/shm_pool.c75
-rw-r--r--drivers/tee/optee/shm_pool.h23
3 files changed, 99 insertions, 0 deletions
diff --git a/drivers/tee/optee/Makefile b/drivers/tee/optee/Makefile
index d526fb88d9c5..48d262ae2f04 100644
--- a/drivers/tee/optee/Makefile
+++ b/drivers/tee/optee/Makefile
@@ -4,3 +4,4 @@ optee-objs += core.o
optee-objs += call.o
optee-objs += rpc.o
optee-objs += supp.o
+optee-objs += shm_pool.o
diff --git a/drivers/tee/optee/shm_pool.c b/drivers/tee/optee/shm_pool.c
new file mode 100644
index 000000000000..49397813fff1
--- /dev/null
+++ b/drivers/tee/optee/shm_pool.c
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2017, EPAM Systems
+ *
+ * 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/device.h>
+#include <linux/dma-buf.h>
+#include <linux/genalloc.h>
+#include <linux/slab.h>
+#include <linux/tee_drv.h>
+#include "optee_private.h"
+#include "optee_smc.h"
+#include "shm_pool.h"
+
+static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm, size_t size)
+{
+ unsigned int order = get_order(size);
+ struct page *page;
+
+ page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
+ if (!page)
+ return -ENOMEM;
+
+ shm->kaddr = page_address(page);
+ shm->paddr = page_to_phys(page);
+ shm->size = PAGE_SIZE << order;
+
+ return 0;
+}
+
+static void pool_op_free(struct tee_shm_pool_mgr *poolm,
+ struct tee_shm *shm)
+{
+ free_pages((unsigned long)shm->kaddr, get_order(shm->size));
+ shm->kaddr = NULL;
+}
+
+static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
+{
+ kfree(poolm);
+}
+
+static const struct tee_shm_pool_mgr_ops pool_ops = {
+ .alloc = pool_op_alloc,
+ .free = pool_op_free,
+ .destroy_poolmgr = pool_op_destroy_poolmgr,
+};
+
+/**
+ * optee_shm_pool_alloc_pages() - create page-based allocator pool
+ *
+ * This pool is used when OP-TEE supports dymanic SHM. In this case
+ * command buffers and such are allocated from kernel's own memory.
+ */
+struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
+{
+ struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
+
+ if (!mgr)
+ return ERR_PTR(-ENOMEM);
+
+ mgr->ops = &pool_ops;
+
+ return mgr;
+}
diff --git a/drivers/tee/optee/shm_pool.h b/drivers/tee/optee/shm_pool.h
new file mode 100644
index 000000000000..4e753c3bf7ec
--- /dev/null
+++ b/drivers/tee/optee/shm_pool.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2015, Linaro Limited
+ * Copyright (c) 2016, EPAM Systems
+ *
+ * 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 SHM_POOL_H
+#define SHM_POOL_H
+
+#include <linux/tee_drv.h>
+
+struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void);
+
+#endif