nvme: lightnvm: attach lightnvm sysfs to nvme block device

Previously, LBA read and write were not supported in the lightnvm
specification. Now that it supports it, lets use the traditional
NVMe gendisk, and attach the lightnvm sysfs geometry export.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

4 files changed, 2 insertions, 248 deletions

diff --git a/drivers/lightnvm/Makefile b/drivers/lightnvm/Makefile
index 1f6b6521016a..a7a0a22cf1a5 100644
--- a/drivers/lightnvm/Makefile
+++ b/drivers/lightnvm/Makefile
@@ -2,6 +2,6 @@
 # Makefile for Open-Channel SSDs.
 #
 
-obj-$(CONFIG_NVM)		:= core.o sysblk.o sysfs.o
+obj-$(CONFIG_NVM)		:= core.o sysblk.o
 obj-$(CONFIG_NVM_GENNVM) 	+= gennvm.o
 obj-$(CONFIG_NVM_RRPC)		+= rrpc.o
diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 1cac0f8bc0dc..11117404b5f5 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -27,8 +27,6 @@
 #include <linux/lightnvm.h>
 #include <linux/sched/sysctl.h>
 
-#include "lightnvm.h"
-
 static LIST_HEAD(nvm_tgt_types);
 static DECLARE_RWSEM(nvm_tgtt_lock);
 static LIST_HEAD(nvm_mgrs);
@@ -657,11 +655,6 @@ err:
 	return ret;
 }
 
-static void nvm_exit(struct nvm_dev *dev)
-{
-	nvm_sysfs_unregister_dev(dev);
-}
-
 struct nvm_dev *nvm_alloc_dev(int node)
 {
 	return kzalloc_node(sizeof(struct nvm_dev), GFP_KERNEL, node);
@@ -691,10 +684,6 @@ int nvm_register(struct nvm_dev *dev)
 		}
 	}
 
-	ret = nvm_sysfs_register_dev(dev);
-	if (ret)
-		goto err_ppalist;
-
 	if (dev->identity.cap & NVM_ID_DCAP_BBLKMGMT) {
 		ret = nvm_get_sysblock(dev, &dev->sb);
 		if (!ret)
@@ -711,8 +700,6 @@ int nvm_register(struct nvm_dev *dev)
 	up_write(&nvm_lock);
 
 	return 0;
-err_ppalist:
-	dev->ops->destroy_dma_pool(dev->dma_pool);
 err_init:
 	kfree(dev->lun_map);
 	return ret;
@@ -725,7 +712,7 @@ void nvm_unregister(struct nvm_dev *dev)
 	list_del(&dev->devices);
 	up_write(&nvm_lock);
 
-	nvm_exit(dev);
+	nvm_free(dev);
 }
 EXPORT_SYMBOL(nvm_unregister);
 
diff --git a/drivers/lightnvm/lightnvm.h b/drivers/lightnvm/lightnvm.h
deleted file mode 100644
index 305c181509a6..000000000000
--- a/drivers/lightnvm/lightnvm.h
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * Copyright (C) 2016 CNEX Labs. All rights reserved.
- * Initial release: Matias Bjorling <matias@cnexlabs.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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; see the file COPYING.  If not, write to
- * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
- * USA.
- *
- */
-
-#ifndef LIGHTNVM_H
-#define LIGHTNVM_H
-
-#include <linux/lightnvm.h>
-
-/* core -> sysfs.c */
-int __must_check nvm_sysfs_register_dev(struct nvm_dev *);
-void nvm_sysfs_unregister_dev(struct nvm_dev *);
-int nvm_sysfs_register(void);
-void nvm_sysfs_unregister(void);
-
-/* sysfs > core */
-void nvm_free(struct nvm_dev *);
-
-#endif
diff --git a/drivers/lightnvm/sysfs.c b/drivers/lightnvm/sysfs.c
deleted file mode 100644
index 0338c27ab95a..000000000000
--- a/drivers/lightnvm/sysfs.c
+++ /dev/null
@@ -1,198 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/lightnvm.h>
-#include <linux/miscdevice.h>
-#include <linux/kobject.h>
-#include <linux/blk-mq.h>
-
-#include "lightnvm.h"
-
-static ssize_t nvm_dev_attr_show(struct device *dev,
-				 struct device_attribute *dattr, char *page)
-{
-	struct nvm_dev *ndev = container_of(dev, struct nvm_dev, dev);
-	struct nvm_id *id = &ndev->identity;
-	struct nvm_id_group *grp = &id->groups[0];
-	struct attribute *attr = &dattr->attr;
-
-	if (strcmp(attr->name, "version") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", id->ver_id);
-	} else if (strcmp(attr->name, "vendor_opcode") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", id->vmnt);
-	} else if (strcmp(attr->name, "capabilities") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", id->cap);
-	} else if (strcmp(attr->name, "device_mode") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", id->dom);
-	} else if (strcmp(attr->name, "media_manager") == 0) {
-		if (!ndev->mt)
-			return scnprintf(page, PAGE_SIZE, "%s\n", "none");
-		return scnprintf(page, PAGE_SIZE, "%s\n", ndev->mt->name);
-	} else if (strcmp(attr->name, "ppa_format") == 0) {
-		return scnprintf(page, PAGE_SIZE,
-			"0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
-			id->ppaf.ch_offset, id->ppaf.ch_len,
-			id->ppaf.lun_offset, id->ppaf.lun_len,
-			id->ppaf.pln_offset, id->ppaf.pln_len,
-			id->ppaf.blk_offset, id->ppaf.blk_len,
-			id->ppaf.pg_offset, id->ppaf.pg_len,
-			id->ppaf.sect_offset, id->ppaf.sect_len);
-	} else if (strcmp(attr->name, "media_type") == 0) {	/* u8 */
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->mtype);
-	} else if (strcmp(attr->name, "flash_media_type") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->fmtype);
-	} else if (strcmp(attr->name, "num_channels") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_ch);
-	} else if (strcmp(attr->name, "num_luns") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_lun);
-	} else if (strcmp(attr->name, "num_planes") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_pln);
-	} else if (strcmp(attr->name, "num_blocks") == 0) {	/* u16 */
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_blk);
-	} else if (strcmp(attr->name, "num_pages") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->num_pg);
-	} else if (strcmp(attr->name, "page_size") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->fpg_sz);
-	} else if (strcmp(attr->name, "hw_sector_size") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->csecs);
-	} else if (strcmp(attr->name, "oob_sector_size") == 0) {/* u32 */
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->sos);
-	} else if (strcmp(attr->name, "read_typ") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->trdt);
-	} else if (strcmp(attr->name, "read_max") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->trdm);
-	} else if (strcmp(attr->name, "prog_typ") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->tprt);
-	} else if (strcmp(attr->name, "prog_max") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->tprm);
-	} else if (strcmp(attr->name, "erase_typ") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->tbet);
-	} else if (strcmp(attr->name, "erase_max") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n", grp->tbem);
-	} else if (strcmp(attr->name, "multiplane_modes") == 0) {
-		return scnprintf(page, PAGE_SIZE, "0x%08x\n", grp->mpos);
-	} else if (strcmp(attr->name, "media_capabilities") == 0) {
-		return scnprintf(page, PAGE_SIZE, "0x%08x\n", grp->mccap);
-	} else if (strcmp(attr->name, "max_phys_secs") == 0) {
-		return scnprintf(page, PAGE_SIZE, "%u\n",
-				ndev->ops->max_phys_sect);
-	} else {
-		return scnprintf(page,
-				 PAGE_SIZE,
-				 "Unhandled attr(%s) in `nvm_dev_attr_show`\n",
-				 attr->name);
-	}
-}
-
-#define NVM_DEV_ATTR_RO(_name)						\
-	DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show, NULL)
-
-static NVM_DEV_ATTR_RO(version);
-static NVM_DEV_ATTR_RO(vendor_opcode);
-static NVM_DEV_ATTR_RO(capabilities);
-static NVM_DEV_ATTR_RO(device_mode);
-static NVM_DEV_ATTR_RO(ppa_format);
-static NVM_DEV_ATTR_RO(media_manager);
-
-static NVM_DEV_ATTR_RO(media_type);
-static NVM_DEV_ATTR_RO(flash_media_type);
-static NVM_DEV_ATTR_RO(num_channels);
-static NVM_DEV_ATTR_RO(num_luns);
-static NVM_DEV_ATTR_RO(num_planes);
-static NVM_DEV_ATTR_RO(num_blocks);
-static NVM_DEV_ATTR_RO(num_pages);
-static NVM_DEV_ATTR_RO(page_size);
-static NVM_DEV_ATTR_RO(hw_sector_size);
-static NVM_DEV_ATTR_RO(oob_sector_size);
-static NVM_DEV_ATTR_RO(read_typ);
-static NVM_DEV_ATTR_RO(read_max);
-static NVM_DEV_ATTR_RO(prog_typ);
-static NVM_DEV_ATTR_RO(prog_max);
-static NVM_DEV_ATTR_RO(erase_typ);
-static NVM_DEV_ATTR_RO(erase_max);
-static NVM_DEV_ATTR_RO(multiplane_modes);
-static NVM_DEV_ATTR_RO(media_capabilities);
-static NVM_DEV_ATTR_RO(max_phys_secs);
-
-#define NVM_DEV_ATTR(_name) (dev_attr_##_name##)
-
-static struct attribute *nvm_dev_attrs[] = {
-	&dev_attr_version.attr,
-	&dev_attr_vendor_opcode.attr,
-	&dev_attr_capabilities.attr,
-	&dev_attr_device_mode.attr,
-	&dev_attr_media_manager.attr,
-
-	&dev_attr_ppa_format.attr,
-	&dev_attr_media_type.attr,
-	&dev_attr_flash_media_type.attr,
-	&dev_attr_num_channels.attr,
-	&dev_attr_num_luns.attr,
-	&dev_attr_num_planes.attr,
-	&dev_attr_num_blocks.attr,
-	&dev_attr_num_pages.attr,
-	&dev_attr_page_size.attr,
-	&dev_attr_hw_sector_size.attr,
-	&dev_attr_oob_sector_size.attr,
-	&dev_attr_read_typ.attr,
-	&dev_attr_read_max.attr,
-	&dev_attr_prog_typ.attr,
-	&dev_attr_prog_max.attr,
-	&dev_attr_erase_typ.attr,
-	&dev_attr_erase_max.attr,
-	&dev_attr_multiplane_modes.attr,
-	&dev_attr_media_capabilities.attr,
-	&dev_attr_max_phys_secs.attr,
-	NULL,
-};
-
-static struct attribute_group nvm_dev_attr_group = {
-	.name = "lightnvm",
-	.attrs = nvm_dev_attrs,
-};
-
-static const struct attribute_group *nvm_dev_attr_groups[] = {
-	&nvm_dev_attr_group,
-	NULL,
-};
-
-static void nvm_dev_release(struct device *device)
-{
-	struct nvm_dev *dev = container_of(device, struct nvm_dev, dev);
-	struct request_queue *q = dev->q;
-
-	pr_debug("nvm/sysfs: `nvm_dev_release`\n");
-
-	blk_mq_unregister_dev(device, q);
-
-	nvm_free(dev);
-}
-
-static struct device_type nvm_type = {
-	.name		= "lightnvm",
-	.groups		= nvm_dev_attr_groups,
-	.release	= nvm_dev_release,
-};
-
-int nvm_sysfs_register_dev(struct nvm_dev *dev)
-{
-	int ret;
-
-	if (!dev->parent_dev)
-		return 0;
-
-	dev->dev.parent = dev->parent_dev;
-	dev_set_name(&dev->dev, "%s", dev->name);
-	dev->dev.type = &nvm_type;
-	device_initialize(&dev->dev);
-	ret = device_add(&dev->dev);
-
-	if (!ret)
-		blk_mq_register_dev(&dev->dev, dev->q);
-
-	return ret;
-}
-
-void nvm_sysfs_unregister_dev(struct nvm_dev *dev)
-{
-	if (dev && dev->parent_dev)
-		kobject_put(&dev->dev.kobj);
-}