Merge git://git.infradead.org/users/willy/linux-nvme

Pull NVMe update from Matthew Wilcox:
 "Mostly bugfixes again for the NVMe driver.  I'd like to call out the
  exported tracepoint in the block layer; I believe Keith has cleared
  this with Jens.

  We've had a few reports from people who're really pounding on NVMe
  devices at scale, hence the timeout changes (and new module
  parameters), hotplug cpu deadlock, tracepoints, and minor performance
  tweaks"

[ Jens hadn't seen that tracepoint thing, but is ok with it - it will
  end up going away when mq conversion happens ]

* git://git.infradead.org/users/willy/linux-nvme: (22 commits)
  NVMe: Fix START_STOP_UNIT Scsi->NVMe translation.
  NVMe: Use Log Page constants in SCSI emulation
  NVMe: Define Log Page constants
  NVMe: Fix hot cpu notification dead lock
  NVMe: Rename io_timeout to nvme_io_timeout
  NVMe: Use last bytes of f/w rev SCSI Inquiry
  NVMe: Adhere to request queue block accounting enable/disable
  NVMe: Fix nvme get/put queue semantics
  NVMe: Delete NVME_GET_FEAT_TEMP_THRESH
  NVMe: Make admin timeout a module parameter
  NVMe: Make iod bio timeout a parameter
  NVMe: Prevent possible NULL pointer dereference
  NVMe: Fix the buffer size passed in GetLogPage(CDW10.NUMD)
  NVMe: Update data structures for NVMe 1.2
  NVMe: Enable BUILD_BUG_ON checks
  NVMe: Update namespace and controller identify structures to the 1.1a spec
  NVMe: Flush with data support
  NVMe: Configure support for block flush
  NVMe: Add tracepoints
  NVMe: Protect against badly formatted CQEs
  ...

2 files changed, 149 insertions, 90 deletions

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index a842c71dcc2..02351e21716 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -10,10 +10,6 @@
  * 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; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 #include <linux/nvme.h>
@@ -46,16 +42,26 @@
 #include <scsi/sg.h>
 #include <asm-generic/io-64-nonatomic-lo-hi.h>
 
-#define NVME_Q_DEPTH 1024
+#include <trace/events/block.h>
+
+#define NVME_Q_DEPTH		1024
 #define SQ_SIZE(depth)		(depth * sizeof(struct nvme_command))
 #define CQ_SIZE(depth)		(depth * sizeof(struct nvme_completion))
-#define ADMIN_TIMEOUT	(60 * HZ)
-#define IOD_TIMEOUT	(4 * NVME_IO_TIMEOUT)
+#define ADMIN_TIMEOUT		(admin_timeout * HZ)
+#define IOD_TIMEOUT		(retry_time * HZ)
+
+static unsigned char admin_timeout = 60;
+module_param(admin_timeout, byte, 0644);
+MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands");
 
-unsigned char io_timeout = 30;
-module_param(io_timeout, byte, 0644);
+unsigned char nvme_io_timeout = 30;
+module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
 MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
 
+static unsigned char retry_time = 30;
+module_param(retry_time, byte, 0644);
+MODULE_PARM_DESC(retry_time, "time in seconds to retry failed I/O");
+
 static int nvme_major;
 module_param(nvme_major, int, 0);
 
@@ -67,6 +73,7 @@ static LIST_HEAD(dev_list);
 static struct task_struct *nvme_thread;
 static struct workqueue_struct *nvme_workq;
 static wait_queue_head_t nvme_kthread_wait;
+static struct notifier_block nvme_nb;
 
 static void nvme_reset_failed_dev(struct work_struct *ws);
 
@@ -199,16 +206,13 @@ static int alloc_cmdid_killable(struct nvme_queue *nvmeq, void *ctx,
 #define CMD_CTX_CANCELLED	(0x30C + CMD_CTX_BASE)
 #define CMD_CTX_COMPLETED	(0x310 + CMD_CTX_BASE)
 #define CMD_CTX_INVALID		(0x314 + CMD_CTX_BASE)
-#define CMD_CTX_FLUSH		(0x318 + CMD_CTX_BASE)
-#define CMD_CTX_ABORT		(0x31C + CMD_CTX_BASE)
+#define CMD_CTX_ABORT		(0x318 + CMD_CTX_BASE)
 
 static void special_completion(struct nvme_queue *nvmeq, void *ctx,
 						struct nvme_completion *cqe)
 {
 	if (ctx == CMD_CTX_CANCELLED)
 		return;
-	if (ctx == CMD_CTX_FLUSH)
-		return;
 	if (ctx == CMD_CTX_ABORT) {
 		++nvmeq->dev->abort_limit;
 		return;
@@ -247,8 +251,9 @@ static void *free_cmdid(struct nvme_queue *nvmeq, int cmdid,
 	void *ctx;
 	struct nvme_cmd_info *info = nvme_cmd_info(nvmeq);
 
-	if (cmdid >= nvmeq->q_depth) {
-		*fn = special_completion;
+	if (cmdid >= nvmeq->q_depth || !info[cmdid].fn) {
+		if (fn)
+			*fn = special_completion;
 		return CMD_CTX_INVALID;
 	}
 	if (fn)
@@ -281,9 +286,17 @@ static struct nvme_queue *raw_nvmeq(struct nvme_dev *dev, int qid)
 
 static struct nvme_queue *get_nvmeq(struct nvme_dev *dev) __acquires(RCU)
 {
+	struct nvme_queue *nvmeq;
 	unsigned queue_id = get_cpu_var(*dev->io_queue);
+
 	rcu_read_lock();
-	return rcu_dereference(dev->queues[queue_id]);
+	nvmeq = rcu_dereference(dev->queues[queue_id]);
+	if (nvmeq)
+		return nvmeq;
+
+	rcu_read_unlock();
+	put_cpu_var(*dev->io_queue);
+	return NULL;
 }
 
 static void put_nvmeq(struct nvme_queue *nvmeq) __releases(RCU)
@@ -295,8 +308,15 @@ static void put_nvmeq(struct nvme_queue *nvmeq) __releases(RCU)
 static struct nvme_queue *lock_nvmeq(struct nvme_dev *dev, int q_idx)
 							__acquires(RCU)
 {
+	struct nvme_queue *nvmeq;
+
 	rcu_read_lock();
-	return rcu_dereference(dev->queues[q_idx]);
+	nvmeq = rcu_dereference(dev->queues[q_idx]);
+	if (nvmeq)
+		return nvmeq;
+
+	rcu_read_unlock();
+	return NULL;
 }
 
 static void unlock_nvmeq(struct nvme_queue *nvmeq) __releases(RCU)
@@ -387,25 +407,30 @@ void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
 static void nvme_start_io_acct(struct bio *bio)
 {
 	struct gendisk *disk = bio->bi_bdev->bd_disk;
-	const int rw = bio_data_dir(bio);
-	int cpu = part_stat_lock();
-	part_round_stats(cpu, &disk->part0);
-	part_stat_inc(cpu, &disk->part0, ios[rw]);
-	part_stat_add(cpu, &disk->part0, sectors[rw], bio_sectors(bio));
-	part_inc_in_flight(&disk->part0, rw);
-	part_stat_unlock();
+	if (blk_queue_io_stat(disk->queue)) {
+		const int rw = bio_data_dir(bio);
+		int cpu = part_stat_lock();
+		part_round_stats(cpu, &disk->part0);
+		part_stat_inc(cpu, &disk->part0, ios[rw]);
+		part_stat_add(cpu, &disk->part0, sectors[rw],
+							bio_sectors(bio));
+		part_inc_in_flight(&disk->part0, rw);
+		part_stat_unlock();
+	}
 }
 
 static void nvme_end_io_acct(struct bio *bio, unsigned long start_time)
 {
 	struct gendisk *disk = bio->bi_bdev->bd_disk;
-	const int rw = bio_data_dir(bio);
-	unsigned long duration = jiffies - start_time;
-	int cpu = part_stat_lock();
-	part_stat_add(cpu, &disk->part0, ticks[rw], duration);
-	part_round_stats(cpu, &disk->part0);
-	part_dec_in_flight(&disk->part0, rw);
-	part_stat_unlock();
+	if (blk_queue_io_stat(disk->queue)) {
+		const int rw = bio_data_dir(bio);
+		unsigned long duration = jiffies - start_time;
+		int cpu = part_stat_lock();
+		part_stat_add(cpu, &disk->part0, ticks[rw], duration);
+		part_round_stats(cpu, &disk->part0);
+		part_dec_in_flight(&disk->part0, rw);
+		part_stat_unlock();
+	}
 }
 
 static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
@@ -414,6 +439,7 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
 	struct nvme_iod *iod = ctx;
 	struct bio *bio = iod->private;
 	u16 status = le16_to_cpup(&cqe->status) >> 1;
+	int error = 0;
 
 	if (unlikely(status)) {
 		if (!(status & NVME_SC_DNR ||
@@ -426,6 +452,7 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
 			wake_up(&nvmeq->sq_full);
 			return;
 		}
+		error = -EIO;
 	}
 	if (iod->nents) {
 		dma_unmap_sg(nvmeq->q_dmadev, iod->sg, iod->nents,
@@ -433,10 +460,9 @@ static void bio_completion(struct nvme_queue *nvmeq, void *ctx,
 		nvme_end_io_acct(bio, iod->start_time);
 	}
 	nvme_free_iod(nvmeq->dev, iod);
-	if (status)
-		bio_endio(bio, -EIO);
-	else
-		bio_endio(bio, 0);
+
+	trace_block_bio_complete(bdev_get_queue(bio->bi_bdev), bio, error);
+	bio_endio(bio, error);
 }
 
 /* length is in bytes.  gfp flags indicates whether we may sleep. */
@@ -525,6 +551,8 @@ static int nvme_split_and_submit(struct bio *bio, struct nvme_queue *nvmeq,
 	if (!split)
 		return -ENOMEM;
 
+	trace_block_split(bdev_get_queue(bio->bi_bdev), bio,
+					split->bi_iter.bi_sector);
 	bio_chain(split, bio);
 
 	if (!waitqueue_active(&nvmeq->sq_full))
@@ -627,16 +655,6 @@ static int nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns,
 	return 0;
 }
 
-int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns)
-{
-	int cmdid = alloc_cmdid(nvmeq, (void *)CMD_CTX_FLUSH,
-					special_completion, NVME_IO_TIMEOUT);
-	if (unlikely(cmdid < 0))
-		return cmdid;
-
-	return nvme_submit_flush(nvmeq, ns, cmdid);
-}
-
 static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod)
 {
 	struct bio *bio = iod->private;
@@ -652,7 +670,7 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod)
 
 	if (bio->bi_rw & REQ_DISCARD)
 		return nvme_submit_discard(nvmeq, ns, bio, iod, cmdid);
-	if ((bio->bi_rw & REQ_FLUSH) && !iod->nents)
+	if (bio->bi_rw & REQ_FLUSH)
 		return nvme_submit_flush(nvmeq, ns, cmdid);
 
 	control = 0;
@@ -686,6 +704,26 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod)
 	return 0;
 }
 
+static int nvme_split_flush_data(struct nvme_queue *nvmeq, struct bio *bio)
+{
+	struct bio *split = bio_clone(bio, GFP_ATOMIC);
+	if (!split)
+		return -ENOMEM;
+
+	split->bi_iter.bi_size = 0;
+	split->bi_phys_segments = 0;
+	bio->bi_rw &= ~REQ_FLUSH;
+	bio_chain(split, bio);
+
+	if (!waitqueue_active(&nvmeq->sq_full))
+		add_wait_queue(&nvmeq->sq_full, &nvmeq->sq_cong_wait);
+	bio_list_add(&nvmeq->sq_cong, split);
+	bio_list_add(&nvmeq->sq_cong, bio);
+	wake_up_process(nvme_thread);
+
+	return 0;
+}
+
 /*
  * Called with local interrupts disabled and the q_lock held.  May not sleep.
  */
@@ -696,11 +734,8 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns,
 	int psegs = bio_phys_segments(ns->queue, bio);
 	int result;
 
-	if ((bio->bi_rw & REQ_FLUSH) && psegs) {
-		result = nvme_submit_flush_data(nvmeq, ns);
-		if (result)
-			return result;
-	}
+	if ((bio->bi_rw & REQ_FLUSH) && psegs)
+		return nvme_split_flush_data(nvmeq, bio);
 
 	iod = nvme_alloc_iod(psegs, bio->bi_iter.bi_size, GFP_ATOMIC);
 	if (!iod)
@@ -795,7 +830,6 @@ static void nvme_make_request(struct request_queue *q, struct bio *bio)
 	int result = -EBUSY;
 
 	if (!nvmeq) {
-		put_nvmeq(NULL);
 		bio_endio(bio, -EIO);
 		return;
 	}
@@ -870,10 +904,8 @@ static int nvme_submit_sync_cmd(struct nvme_dev *dev, int q_idx,
 	struct nvme_queue *nvmeq;
 
 	nvmeq = lock_nvmeq(dev, q_idx);
-	if (!nvmeq) {
-		unlock_nvmeq(nvmeq);
+	if (!nvmeq)
 		return -ENODEV;
-	}
 
 	cmdinfo.task = current;
 	cmdinfo.status = -EINTR;
@@ -898,9 +930,10 @@ static int nvme_submit_sync_cmd(struct nvme_dev *dev, int q_idx,
 
 	if (cmdinfo.status == -EINTR) {
 		nvmeq = lock_nvmeq(dev, q_idx);
-		if (nvmeq)
+		if (nvmeq) {
 			nvme_abort_command(nvmeq, cmdid);
-		unlock_nvmeq(nvmeq);
+			unlock_nvmeq(nvmeq);
+		}
 		return -EINTR;
 	}
 
@@ -1358,7 +1391,8 @@ static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled)
 			return -EINTR;
 		if (time_after(jiffies, timeout)) {
 			dev_err(&dev->pci_dev->dev,
-				"Device not ready; aborting initialisation\n");
+				"Device not ready; aborting %s\n", enabled ?
+						"initialisation" : "reset");
 			return -ENODEV;
 		}
 	}
@@ -1481,7 +1515,11 @@ struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
 		goto put_pages;
 	}
 
+	err = -ENOMEM;
 	iod = nvme_alloc_iod(count, length, GFP_KERNEL);
+	if (!iod)
+		goto put_pages;
+
 	sg = iod->sg;
 	sg_init_table(sg, count);
 	for (i = 0; i < count; i++) {
@@ -1494,7 +1532,6 @@ struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
 	sg_mark_end(&sg[i - 1]);
 	iod->nents = count;
 
-	err = -ENOMEM;
 	nents = dma_map_sg(&dev->pci_dev->dev, sg, count,
 				write ? DMA_TO_DEVICE : DMA_FROM_DEVICE);
 	if (!nents)
@@ -1894,6 +1931,8 @@ static struct nvme_ns *nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid,
 	blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
 	if (dev->max_hw_sectors)
 		blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
+	if (dev->vwc & NVME_CTRL_VWC_PRESENT)
+		blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
 
 	disk->major = nvme_major;
 	disk->first_minor = 0;
@@ -2062,8 +2101,13 @@ static int set_queue_count(struct nvme_dev *dev, int count)
 
 	status = nvme_set_features(dev, NVME_FEAT_NUM_QUEUES, q_count, 0,
 								&result);
-	if (status)
-		return status < 0 ? -EIO : -EBUSY;
+	if (status < 0)
+		return status;
+	if (status > 0) {
+		dev_err(&dev->pci_dev->dev, "Could not set queue count (%d)\n",
+									status);
+		return -EBUSY;
+	}
 	return min(result & 0xffff, result >> 16) + 1;
 }
 
@@ -2072,14 +2116,25 @@ static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues)
 	return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride);
 }
 
+static void nvme_cpu_workfn(struct work_struct *work)
+{
+	struct nvme_dev *dev = container_of(work, struct nvme_dev, cpu_work);
+	if (dev->initialized)
+		nvme_assign_io_queues(dev);
+}
+
 static int nvme_cpu_notify(struct notifier_block *self,
 				unsigned long action, void *hcpu)
 {
-	struct nvme_dev *dev = container_of(self, struct nvme_dev, nb);
+	struct nvme_dev *dev;
+
 	switch (action) {
 	case CPU_ONLINE:
 	case CPU_DEAD:
-		nvme_assign_io_queues(dev);
+		spin_lock(&dev_list_lock);
+		list_for_each_entry(dev, &dev_list, node)
+			schedule_work(&dev->cpu_work);
+		spin_unlock(&dev_list_lock);
 		break;
 	}
 	return NOTIFY_OK;
@@ -2148,11 +2203,6 @@ static int nvme_setup_io_queues(struct nvme_dev *dev)
 	nvme_free_queues(dev, nr_io_queues + 1);
 	nvme_assign_io_queues(dev);
 
-	dev->nb.notifier_call = &nvme_cpu_notify;
-	result = register_hotcpu_notifier(&dev->nb);
-	if (result)
-		goto free_queues;
-
 	return 0;
 
  free_queues:
@@ -2184,6 +2234,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
 
 	res = nvme_identify(dev, 0, 1, dma_addr);
 	if (res) {
+		dev_err(&pdev->dev, "Identify Controller failed (%d)\n", res);
 		res = -EIO;
 		goto out;
 	}
@@ -2192,6 +2243,7 @@ static int nvme_dev_add(struct nvme_dev *dev)
 	nn = le32_to_cpup(&ctrl->nn);
 	dev->oncs = le16_to_cpup(&ctrl->oncs);
 	dev->abort_limit = ctrl->acl + 1;
+	dev->vwc = ctrl->vwc;
 	memcpy(dev->serial, ctrl->sn, sizeof(ctrl->sn));
 	memcpy(dev->model, ctrl->mn, sizeof(ctrl->mn));
 	memcpy(dev->firmware_rev, ctrl->fr, sizeof(ctrl->fr));
@@ -2450,8 +2502,6 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
 	int i;
 
 	dev->initialized = 0;
-	unregister_hotcpu_notifier(&dev->nb);
-
 	nvme_dev_list_remove(dev);
 
 	if (!dev->bar || (dev->bar && readl(&dev->bar->csts) == -1)) {
@@ -2722,6 +2772,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	INIT_LIST_HEAD(&dev->namespaces);
 	dev->reset_workfn = nvme_reset_failed_dev;
 	INIT_WORK(&dev->reset_work, nvme_reset_workfn);
+	INIT_WORK(&dev->cpu_work, nvme_cpu_workfn);
 	dev->pci_dev = pdev;
 	pci_set_drvdata(pdev, dev);
 	result = nvme_set_instance(dev);
@@ -2801,6 +2852,7 @@ static void nvme_remove(struct pci_dev *pdev)
 
 	pci_set_drvdata(pdev, NULL);
 	flush_work(&dev->reset_work);
+	flush_work(&dev->cpu_work);
 	misc_deregister(&dev->miscdev);
 	nvme_dev_remove(dev);
 	nvme_dev_shutdown(dev);
@@ -2889,11 +2941,18 @@ static int __init nvme_init(void)
 	else if (result > 0)
 		nvme_major = result;
 
-	result = pci_register_driver(&nvme_driver);
+	nvme_nb.notifier_call = &nvme_cpu_notify;
+	result = register_hotcpu_notifier(&nvme_nb);
 	if (result)
 		goto unregister_blkdev;
+
+	result = pci_register_driver(&nvme_driver);
+	if (result)
+		goto unregister_hotcpu;
 	return 0;
 
+ unregister_hotcpu:
+	unregister_hotcpu_notifier(&nvme_nb);
  unregister_blkdev:
 	unregister_blkdev(nvme_major, "nvme");
  kill_workq:
@@ -2904,9 +2963,11 @@ static int __init nvme_init(void)
 static void __exit nvme_exit(void)
 {
 	pci_unregister_driver(&nvme_driver);
+	unregister_hotcpu_notifier(&nvme_nb);
 	unregister_blkdev(nvme_major, "nvme");
 	destroy_workqueue(nvme_workq);
 	BUG_ON(nvme_thread && !IS_ERR(nvme_thread));
+	_nvme_check_size();
 }
 
 MODULE_AUTHOR("Matthew Wilcox <willy@linux.intel.com>");
diff --git a/drivers/block/nvme-scsi.c b/drivers/block/nvme-scsi.c
index 2c3f5be06da..a4cd6d691c6 100644
--- a/drivers/block/nvme-scsi.c
+++ b/drivers/block/nvme-scsi.c
@@ -1,6 +1,6 @@
 /*
  * NVM Express device driver
- * Copyright (c) 2011, Intel Corporation.
+ * Copyright (c) 2011-2014, Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -10,10 +10,6 @@
  * 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; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
 /*
@@ -243,8 +239,6 @@ static int sg_version_num = 30534;	/* 2 digits for each component */
 #define READ_CAP_16_RESP_SIZE				32
 
 /* NVMe Namespace and Command Defines */
-#define NVME_GET_SMART_LOG_PAGE				0x02
-#define NVME_GET_FEAT_TEMP_THRESH			0x04
 #define BYTES_TO_DWORDS					4
 #define NVME_MAX_FIRMWARE_SLOT				7
 
@@ -686,6 +680,7 @@ static int nvme_trans_standard_inquiry_page(struct nvme_ns *ns,
 	u8 resp_data_format = 0x02;
 	u8 protect;
 	u8 cmdque = 0x01 << 1;
+	u8 fw_offset = sizeof(dev->firmware_rev);
 
 	mem = dma_alloc_coherent(&dev->pci_dev->dev, sizeof(struct nvme_id_ns),
 				&dma_addr, GFP_KERNEL);
@@ -721,7 +716,11 @@ static int nvme_trans_standard_inquiry_page(struct nvme_ns *ns,
 	inq_response[7] = cmdque;	/* wbus16=0 | sync=0 | vs=0 */
 	strncpy(&inq_response[8], "NVMe    ", 8);
 	strncpy(&inq_response[16], dev->model, 16);
-	strncpy(&inq_response[32], dev->firmware_rev, 4);
+
+	while (dev->firmware_rev[fw_offset - 1] == ' ' && fw_offset > 4)
+		fw_offset--;
+	fw_offset -= 4;
+	strncpy(&inq_response[32], dev->firmware_rev + fw_offset, 4);
 
 	xfer_len = min(alloc_len, STANDARD_INQUIRY_LENGTH);
 	res = nvme_trans_copy_to_user(hdr, inq_response, xfer_len);
@@ -1018,8 +1017,8 @@ static int nvme_trans_log_info_exceptions(struct nvme_ns *ns,
 	c.common.opcode = nvme_admin_get_log_page;
 	c.common.nsid = cpu_to_le32(0xFFFFFFFF);
 	c.common.prp1 = cpu_to_le64(dma_addr);
-	c.common.cdw10[0] = cpu_to_le32(((sizeof(struct nvme_smart_log) /
-			BYTES_TO_DWORDS) << 16) | NVME_GET_SMART_LOG_PAGE);
+	c.common.cdw10[0] = cpu_to_le32((((sizeof(struct nvme_smart_log) /
+			BYTES_TO_DWORDS) - 1) << 16) | NVME_LOG_SMART);
 	res = nvme_submit_admin_cmd(dev, &c, NULL);
 	if (res != NVME_SC_SUCCESS) {
 		temp_c = LOG_TEMP_UNKNOWN;
@@ -1086,8 +1085,8 @@ static int nvme_trans_log_temperature(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	c.common.opcode = nvme_admin_get_log_page;
 	c.common.nsid = cpu_to_le32(0xFFFFFFFF);
 	c.common.prp1 = cpu_to_le64(dma_addr);
-	c.common.cdw10[0] = cpu_to_le32(((sizeof(struct nvme_smart_log) /
-			BYTES_TO_DWORDS) << 16) | NVME_GET_SMART_LOG_PAGE);
+	c.common.cdw10[0] = cpu_to_le32((((sizeof(struct nvme_smart_log) /
+			BYTES_TO_DWORDS) - 1) << 16) | NVME_LOG_SMART);
 	res = nvme_submit_admin_cmd(dev, &c, NULL);
 	if (res != NVME_SC_SUCCESS) {
 		temp_c_cur = LOG_TEMP_UNKNOWN;
@@ -1477,7 +1476,7 @@ static int nvme_trans_power_state(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 		goto out_dma;
 	}
 	id_ctrl = mem;
-	lowest_pow_st = id_ctrl->npss - 1;
+	lowest_pow_st = max(POWER_STATE_0, (int)(id_ctrl->npss - 1));
 
 	switch (pc) {
 	case NVME_POWER_STATE_START_VALID:
@@ -1494,20 +1493,19 @@ static int nvme_trans_power_state(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 		break;
 	case NVME_POWER_STATE_IDLE:
 		/* Action unspecified if POWER CONDITION MODIFIER != [0,1,2] */
-		/* min of desired state and (lps-1) because lps is STOP */
 		if (pcmod == 0x0)
-			ps_desired = min(POWER_STATE_1, (lowest_pow_st - 1));
+			ps_desired = POWER_STATE_1;
 		else if (pcmod == 0x1)
-			ps_desired = min(POWER_STATE_2, (lowest_pow_st - 1));
+			ps_desired = POWER_STATE_2;
 		else if (pcmod == 0x2)
-			ps_desired = min(POWER_STATE_3, (lowest_pow_st - 1));
+			ps_desired = POWER_STATE_3;
 		break;
 	case NVME_POWER_STATE_STANDBY:
 		/* Action unspecified if POWER CONDITION MODIFIER != [0,1] */
 		if (pcmod == 0x0)
-			ps_desired = max(0, (lowest_pow_st - 2));
+			ps_desired = max(POWER_STATE_0, (lowest_pow_st - 2));
 		else if (pcmod == 0x1)
-			ps_desired = max(0, (lowest_pow_st - 1));
+			ps_desired = max(POWER_STATE_0, (lowest_pow_st - 1));
 		break;
 	case NVME_POWER_STATE_LU_CONTROL:
 	default: