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author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-02 13:14:58 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-02 13:14:58 -0700 |
commit | 52b084d31cbc8e90cb6fc1ac4061d9a24375c89d (patch) | |
tree | b0ebeae6ae724d6cc1c79702d8201e7767b6f3de /drivers/block | |
parent | 1081230b748de8f03f37f80c53dfa89feda9b8de (diff) | |
parent | e19b127f5b76ec03b9c52b64f117dc75bb39eda1 (diff) | |
download | linux-52b084d31cbc8e90cb6fc1ac4061d9a24375c89d.tar.gz linux-52b084d31cbc8e90cb6fc1ac4061d9a24375c89d.tar.bz2 linux-52b084d31cbc8e90cb6fc1ac4061d9a24375c89d.zip |
Merge branch 'for-4.3/drivers' of git://git.kernel.dk/linux-block
Pull block driver updates from Jens Axboe:
"On top of the 4.3 core block IO changes, here are the driver related
changes for 4.3. Basically just NVMe and nbd this time around:
- NVMe:
- PRACT PI improvement from Alok Pandey.
- Cleanups and improvements on submission queue doorbell and
writing, using CMB if available. From Jon Derrick.
- From Keith, support for setting queue maximum segments, and
reset support.
- Also from Jon, fixup of u64 division issue on 32-bit archs and
wiring up of the reset support through and ioctl.
- Two small cleanups from Matias and Sunad
- Various code cleanups and fixes from Markus Pargmann"
* 'for-4.3/drivers' of git://git.kernel.dk/linux-block:
NVMe: Using PRACT bit to generate and verify PI by controller
NVMe:Remove unreachable code in nvme_abort_req
NVMe: Add nvme subsystem reset IOCTL
NVMe: Add nvme subsystem reset support
NVMe: removed unused nn var from nvme_dev_add
NVMe: Set queue max segments
nbd: flags is a u32 variable
nbd: Rename functions for clearness of recv/send path
nbd: Change 'disconnect' to be boolean
nbd: Add debugfs entries
nbd: Remove variable 'pid'
nbd: Move clear queue debug message
nbd: Remove 'harderror' and propagate error properly
nbd: restructure sock_shutdown
nbd: sock_shutdown, remove conditional lock
nbd: Fix timeout detection
nvme: Fixes u64 division which breaks i386 builds
NVMe: Use CMB for the IO SQes if available
NVMe: Unify SQ entry writing and doorbell ringing
Diffstat (limited to 'drivers/block')
-rw-r--r-- | drivers/block/nbd.c | 362 | ||||
-rw-r--r-- | drivers/block/nvme-core.c | 267 |
2 files changed, 484 insertions, 145 deletions
diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index f169faf9838a..293495a75d3d 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -33,6 +33,7 @@ #include <linux/net.h> #include <linux/kthread.h> #include <linux/types.h> +#include <linux/debugfs.h> #include <asm/uaccess.h> #include <asm/types.h> @@ -40,8 +41,7 @@ #include <linux/nbd.h> struct nbd_device { - int flags; - int harderror; /* Code of hard error */ + u32 flags; struct socket * sock; /* If == NULL, device is not ready, yet */ int magic; @@ -56,11 +56,24 @@ struct nbd_device { struct gendisk *disk; int blksize; loff_t bytesize; - pid_t pid; /* pid of nbd-client, if attached */ int xmit_timeout; - int disconnect; /* a disconnect has been requested by user */ + bool disconnect; /* a disconnect has been requested by user */ + + struct timer_list timeout_timer; + struct task_struct *task_recv; + struct task_struct *task_send; + +#if IS_ENABLED(CONFIG_DEBUG_FS) + struct dentry *dbg_dir; +#endif }; +#if IS_ENABLED(CONFIG_DEBUG_FS) +static struct dentry *nbd_dbg_dir; +#endif + +#define nbd_name(nbd) ((nbd)->disk->disk_name) + #define NBD_MAGIC 0x68797548 static unsigned int nbds_max = 16; @@ -113,26 +126,36 @@ static void nbd_end_request(struct nbd_device *nbd, struct request *req) /* * Forcibly shutdown the socket causing all listeners to error */ -static void sock_shutdown(struct nbd_device *nbd, int lock) +static void sock_shutdown(struct nbd_device *nbd) { - if (lock) - mutex_lock(&nbd->tx_lock); - if (nbd->sock) { - dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n"); - kernel_sock_shutdown(nbd->sock, SHUT_RDWR); - nbd->sock = NULL; - } - if (lock) - mutex_unlock(&nbd->tx_lock); + if (!nbd->sock) + return; + + dev_warn(disk_to_dev(nbd->disk), "shutting down socket\n"); + kernel_sock_shutdown(nbd->sock, SHUT_RDWR); + nbd->sock = NULL; + del_timer_sync(&nbd->timeout_timer); } static void nbd_xmit_timeout(unsigned long arg) { - struct task_struct *task = (struct task_struct *)arg; + struct nbd_device *nbd = (struct nbd_device *)arg; + struct task_struct *task; + + if (list_empty(&nbd->queue_head)) + return; + + nbd->disconnect = true; + + task = READ_ONCE(nbd->task_recv); + if (task) + force_sig(SIGKILL, task); - printk(KERN_WARNING "nbd: killing hung xmit (%s, pid: %d)\n", - task->comm, task->pid); - force_sig(SIGKILL, task); + task = READ_ONCE(nbd->task_send); + if (task) + force_sig(SIGKILL, nbd->task_send); + + dev_err(nbd_to_dev(nbd), "Connection timed out, killed receiver and sender, shutting down connection\n"); } /* @@ -171,33 +194,12 @@ static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size, msg.msg_controllen = 0; msg.msg_flags = msg_flags | MSG_NOSIGNAL; - if (send) { - struct timer_list ti; - - if (nbd->xmit_timeout) { - init_timer(&ti); - ti.function = nbd_xmit_timeout; - ti.data = (unsigned long)current; - ti.expires = jiffies + nbd->xmit_timeout; - add_timer(&ti); - } + if (send) result = kernel_sendmsg(sock, &msg, &iov, 1, size); - if (nbd->xmit_timeout) - del_timer_sync(&ti); - } else + else result = kernel_recvmsg(sock, &msg, &iov, 1, size, msg.msg_flags); - if (signal_pending(current)) { - siginfo_t info; - printk(KERN_WARNING "nbd (pid %d: %s) got signal %d\n", - task_pid_nr(current), current->comm, - dequeue_signal_lock(current, ¤t->blocked, &info)); - result = -EINTR; - sock_shutdown(nbd, !send); - break; - } - if (result <= 0) { if (result == 0) result = -EPIPE; /* short read */ @@ -210,6 +212,9 @@ static int sock_xmit(struct nbd_device *nbd, int send, void *buf, int size, sigprocmask(SIG_SETMASK, &oldset, NULL); tsk_restore_flags(current, pflags, PF_MEMALLOC); + if (!send && nbd->xmit_timeout) + mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); + return result; } @@ -333,26 +338,24 @@ static struct request *nbd_read_stat(struct nbd_device *nbd) if (result <= 0) { dev_err(disk_to_dev(nbd->disk), "Receive control failed (result %d)\n", result); - goto harderror; + return ERR_PTR(result); } if (ntohl(reply.magic) != NBD_REPLY_MAGIC) { dev_err(disk_to_dev(nbd->disk), "Wrong magic (0x%lx)\n", (unsigned long)ntohl(reply.magic)); - result = -EPROTO; - goto harderror; + return ERR_PTR(-EPROTO); } req = nbd_find_request(nbd, *(struct request **)reply.handle); if (IS_ERR(req)) { result = PTR_ERR(req); if (result != -ENOENT) - goto harderror; + return ERR_PTR(result); dev_err(disk_to_dev(nbd->disk), "Unexpected reply (%p)\n", reply.handle); - result = -EBADR; - goto harderror; + return ERR_PTR(-EBADR); } if (ntohl(reply.error)) { @@ -380,18 +383,15 @@ static struct request *nbd_read_stat(struct nbd_device *nbd) } } return req; -harderror: - nbd->harderror = result; - return NULL; } static ssize_t pid_show(struct device *dev, struct device_attribute *attr, char *buf) { struct gendisk *disk = dev_to_disk(dev); + struct nbd_device *nbd = (struct nbd_device *)disk->private_data; - return sprintf(buf, "%ld\n", - (long) ((struct nbd_device *)disk->private_data)->pid); + return sprintf(buf, "%d\n", task_pid_nr(nbd->task_recv)); } static struct device_attribute pid_attr = { @@ -399,7 +399,7 @@ static struct device_attribute pid_attr = { .show = pid_show, }; -static int nbd_do_it(struct nbd_device *nbd) +static int nbd_thread_recv(struct nbd_device *nbd) { struct request *req; int ret; @@ -407,20 +407,43 @@ static int nbd_do_it(struct nbd_device *nbd) BUG_ON(nbd->magic != NBD_MAGIC); sk_set_memalloc(nbd->sock->sk); - nbd->pid = task_pid_nr(current); + + nbd->task_recv = current; + ret = device_create_file(disk_to_dev(nbd->disk), &pid_attr); if (ret) { dev_err(disk_to_dev(nbd->disk), "device_create_file failed!\n"); - nbd->pid = 0; + nbd->task_recv = NULL; return ret; } - while ((req = nbd_read_stat(nbd)) != NULL) + while (1) { + req = nbd_read_stat(nbd); + if (IS_ERR(req)) { + ret = PTR_ERR(req); + break; + } + nbd_end_request(nbd, req); + } device_remove_file(disk_to_dev(nbd->disk), &pid_attr); - nbd->pid = 0; - return 0; + + nbd->task_recv = NULL; + + if (signal_pending(current)) { + siginfo_t info; + + ret = dequeue_signal_lock(current, ¤t->blocked, &info); + dev_warn(nbd_to_dev(nbd), "pid %d, %s, got signal %d\n", + task_pid_nr(current), current->comm, ret); + mutex_lock(&nbd->tx_lock); + sock_shutdown(nbd); + mutex_unlock(&nbd->tx_lock); + ret = -ETIMEDOUT; + } + + return ret; } static void nbd_clear_que(struct nbd_device *nbd) @@ -455,6 +478,7 @@ static void nbd_clear_que(struct nbd_device *nbd) req->errors++; nbd_end_request(nbd, req); } + dev_dbg(disk_to_dev(nbd->disk), "queue cleared\n"); } @@ -482,6 +506,9 @@ static void nbd_handle_req(struct nbd_device *nbd, struct request *req) nbd->active_req = req; + if (nbd->xmit_timeout && list_empty_careful(&nbd->queue_head)) + mod_timer(&nbd->timeout_timer, jiffies + nbd->xmit_timeout); + if (nbd_send_req(nbd, req) != 0) { dev_err(disk_to_dev(nbd->disk), "Request send failed\n"); req->errors++; @@ -503,11 +530,13 @@ error_out: nbd_end_request(nbd, req); } -static int nbd_thread(void *data) +static int nbd_thread_send(void *data) { struct nbd_device *nbd = data; struct request *req; + nbd->task_send = current; + set_user_nice(current, MIN_NICE); while (!kthread_should_stop() || !list_empty(&nbd->waiting_queue)) { /* wait for something to do */ @@ -515,6 +544,20 @@ static int nbd_thread(void *data) kthread_should_stop() || !list_empty(&nbd->waiting_queue)); + if (signal_pending(current)) { + siginfo_t info; + int ret; + + ret = dequeue_signal_lock(current, ¤t->blocked, + &info); + dev_warn(nbd_to_dev(nbd), "pid %d, %s, got signal %d\n", + task_pid_nr(current), current->comm, ret); + mutex_lock(&nbd->tx_lock); + sock_shutdown(nbd); + mutex_unlock(&nbd->tx_lock); + break; + } + /* extract request */ if (list_empty(&nbd->waiting_queue)) continue; @@ -528,6 +571,9 @@ static int nbd_thread(void *data) /* handle request */ nbd_handle_req(nbd, req); } + + nbd->task_send = NULL; + return 0; } @@ -538,7 +584,7 @@ static int nbd_thread(void *data) * { printk( "Warning: Ignoring result!\n"); nbd_end_request( req ); } */ -static void do_nbd_request(struct request_queue *q) +static void nbd_request_handler(struct request_queue *q) __releases(q->queue_lock) __acquires(q->queue_lock) { struct request *req; @@ -574,6 +620,9 @@ static void do_nbd_request(struct request_queue *q) } } +static int nbd_dev_dbg_init(struct nbd_device *nbd); +static void nbd_dev_dbg_close(struct nbd_device *nbd); + /* Must be called with tx_lock held */ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, @@ -597,7 +646,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, if (!nbd->sock) return -EINVAL; - nbd->disconnect = 1; + nbd->disconnect = true; nbd_send_req(nbd, &sreq); return 0; @@ -625,7 +674,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, nbd->sock = sock; if (max_part > 0) bdev->bd_invalidated = 1; - nbd->disconnect = 0; /* we're connected now */ + nbd->disconnect = false; /* we're connected now */ return 0; } return -EINVAL; @@ -648,6 +697,12 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, case NBD_SET_TIMEOUT: nbd->xmit_timeout = arg * HZ; + if (arg) + mod_timer(&nbd->timeout_timer, + jiffies + nbd->xmit_timeout); + else + del_timer_sync(&nbd->timeout_timer); + return 0; case NBD_SET_FLAGS: @@ -666,7 +721,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, struct socket *sock; int error; - if (nbd->pid) + if (nbd->task_recv) return -EBUSY; if (!nbd->sock) return -EINVAL; @@ -683,24 +738,24 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, else blk_queue_flush(nbd->disk->queue, 0); - thread = kthread_run(nbd_thread, nbd, "%s", - nbd->disk->disk_name); + thread = kthread_run(nbd_thread_send, nbd, "%s", + nbd_name(nbd)); if (IS_ERR(thread)) { mutex_lock(&nbd->tx_lock); return PTR_ERR(thread); } - error = nbd_do_it(nbd); + nbd_dev_dbg_init(nbd); + error = nbd_thread_recv(nbd); + nbd_dev_dbg_close(nbd); kthread_stop(thread); mutex_lock(&nbd->tx_lock); - if (error) - return error; - sock_shutdown(nbd, 0); + + sock_shutdown(nbd); sock = nbd->sock; nbd->sock = NULL; nbd_clear_que(nbd); - dev_warn(disk_to_dev(nbd->disk), "queue cleared\n"); kill_bdev(bdev); queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, nbd->disk->queue); set_device_ro(bdev, false); @@ -714,7 +769,7 @@ static int __nbd_ioctl(struct block_device *bdev, struct nbd_device *nbd, blkdev_reread_part(bdev); if (nbd->disconnect) /* user requested, ignore socket errors */ return 0; - return nbd->harderror; + return error; } case NBD_CLEAR_QUE: @@ -758,6 +813,161 @@ static const struct block_device_operations nbd_fops = .ioctl = nbd_ioctl, }; +#if IS_ENABLED(CONFIG_DEBUG_FS) + +static int nbd_dbg_tasks_show(struct seq_file *s, void *unused) +{ + struct nbd_device *nbd = s->private; + + if (nbd->task_recv) + seq_printf(s, "recv: %d\n", task_pid_nr(nbd->task_recv)); + if (nbd->task_send) + seq_printf(s, "send: %d\n", task_pid_nr(nbd->task_send)); + + return 0; +} + +static int nbd_dbg_tasks_open(struct inode *inode, struct file *file) +{ + return single_open(file, nbd_dbg_tasks_show, inode->i_private); +} + +static const struct file_operations nbd_dbg_tasks_ops = { + .open = nbd_dbg_tasks_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int nbd_dbg_flags_show(struct seq_file *s, void *unused) +{ + struct nbd_device *nbd = s->private; + u32 flags = nbd->flags; + + seq_printf(s, "Hex: 0x%08x\n\n", flags); + + seq_puts(s, "Known flags:\n"); + + if (flags & NBD_FLAG_HAS_FLAGS) + seq_puts(s, "NBD_FLAG_HAS_FLAGS\n"); + if (flags & NBD_FLAG_READ_ONLY) + seq_puts(s, "NBD_FLAG_READ_ONLY\n"); + if (flags & NBD_FLAG_SEND_FLUSH) + seq_puts(s, "NBD_FLAG_SEND_FLUSH\n"); + if (flags & NBD_FLAG_SEND_TRIM) + seq_puts(s, "NBD_FLAG_SEND_TRIM\n"); + + return 0; +} + +static int nbd_dbg_flags_open(struct inode *inode, struct file *file) +{ + return single_open(file, nbd_dbg_flags_show, inode->i_private); +} + +static const struct file_operations nbd_dbg_flags_ops = { + .open = nbd_dbg_flags_open, + .read = seq_read, + .llseek = seq_lseek, + .release = single_release, +}; + +static int nbd_dev_dbg_init(struct nbd_device *nbd) +{ + struct dentry *dir; + struct dentry *f; + + dir = debugfs_create_dir(nbd_name(nbd), nbd_dbg_dir); + if (IS_ERR_OR_NULL(dir)) { + dev_err(nbd_to_dev(nbd), "Failed to create debugfs dir for '%s' (%ld)\n", + nbd_name(nbd), PTR_ERR(dir)); + return PTR_ERR(dir); + } + nbd->dbg_dir = dir; + + f = debugfs_create_file("tasks", 0444, dir, nbd, &nbd_dbg_tasks_ops); + if (IS_ERR_OR_NULL(f)) { + dev_err(nbd_to_dev(nbd), "Failed to create debugfs file 'tasks', %ld\n", + PTR_ERR(f)); + return PTR_ERR(f); + } + + f = debugfs_create_u64("size_bytes", 0444, dir, &nbd->bytesize); + if (IS_ERR_OR_NULL(f)) { + dev_err(nbd_to_dev(nbd), "Failed to create debugfs file 'size_bytes', %ld\n", + PTR_ERR(f)); + return PTR_ERR(f); + } + + f = debugfs_create_u32("timeout", 0444, dir, &nbd->xmit_timeout); + if (IS_ERR_OR_NULL(f)) { + dev_err(nbd_to_dev(nbd), "Failed to create debugfs file 'timeout', %ld\n", + PTR_ERR(f)); + return PTR_ERR(f); + } + + f = debugfs_create_u32("blocksize", 0444, dir, &nbd->blksize); + if (IS_ERR_OR_NULL(f)) { + dev_err(nbd_to_dev(nbd), "Failed to create debugfs file 'blocksize', %ld\n", + PTR_ERR(f)); + return PTR_ERR(f); + } + + f = debugfs_create_file("flags", 0444, dir, &nbd, &nbd_dbg_flags_ops); + if (IS_ERR_OR_NULL(f)) { + dev_err(nbd_to_dev(nbd), "Failed to create debugfs file 'flags', %ld\n", + PTR_ERR(f)); + return PTR_ERR(f); + } + + return 0; +} + +static void nbd_dev_dbg_close(struct nbd_device *nbd) +{ + debugfs_remove_recursive(nbd->dbg_dir); +} + +static int nbd_dbg_init(void) +{ + struct dentry *dbg_dir; + + dbg_dir = debugfs_create_dir("nbd", NULL); + if (IS_ERR(dbg_dir)) + return PTR_ERR(dbg_dir); + + nbd_dbg_dir = dbg_dir; + + return 0; +} + +static void nbd_dbg_close(void) +{ + debugfs_remove_recursive(nbd_dbg_dir); +} + +#else /* IS_ENABLED(CONFIG_DEBUG_FS) */ + +static int nbd_dev_dbg_init(struct nbd_device *nbd) +{ + return 0; +} + +static void nbd_dev_dbg_close(struct nbd_device *nbd) +{ +} + +static int nbd_dbg_init(void) +{ + return 0; +} + +static void nbd_dbg_close(void) +{ +} + +#endif + /* * And here should be modules and kernel interface * (Just smiley confuses emacs :-) @@ -811,7 +1021,7 @@ static int __init nbd_init(void) * every gendisk to have its very own request_queue struct. * These structs are big so we dynamically allocate them. */ - disk->queue = blk_init_queue(do_nbd_request, &nbd_lock); + disk->queue = blk_init_queue(nbd_request_handler, &nbd_lock); if (!disk->queue) { put_disk(disk); goto out; @@ -835,6 +1045,8 @@ static int __init nbd_init(void) printk(KERN_INFO "nbd: registered device at major %d\n", NBD_MAJOR); + nbd_dbg_init(); + for (i = 0; i < nbds_max; i++) { struct gendisk *disk = nbd_dev[i].disk; nbd_dev[i].magic = NBD_MAGIC; @@ -842,6 +1054,9 @@ static int __init nbd_init(void) spin_lock_init(&nbd_dev[i].queue_lock); INIT_LIST_HEAD(&nbd_dev[i].queue_head); mutex_init(&nbd_dev[i].tx_lock); + init_timer(&nbd_dev[i].timeout_timer); + nbd_dev[i].timeout_timer.function = nbd_xmit_timeout; + nbd_dev[i].timeout_timer.data = (unsigned long)&nbd_dev[i]; init_waitqueue_head(&nbd_dev[i].active_wq); init_waitqueue_head(&nbd_dev[i].waiting_wq); nbd_dev[i].blksize = 1024; @@ -868,6 +1083,9 @@ out: static void __exit nbd_cleanup(void) { int i; + + nbd_dbg_close(); + for (i = 0; i < nbds_max; i++) { struct gendisk *disk = nbd_dev[i].disk; nbd_dev[i].magic = 0; diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index 2f694d78da55..b97fc3fe0916 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -72,6 +72,10 @@ module_param(nvme_char_major, int, 0); static int use_threaded_interrupts; module_param(use_threaded_interrupts, int, 0); +static bool use_cmb_sqes = true; +module_param(use_cmb_sqes, bool, 0644); +MODULE_PARM_DESC(use_cmb_sqes, "use controller's memory buffer for I/O SQes"); + static DEFINE_SPINLOCK(dev_list_lock); static LIST_HEAD(dev_list); static struct task_struct *nvme_thread; @@ -103,6 +107,7 @@ struct nvme_queue { char irqname[24]; /* nvme4294967295-65535\0 */ spinlock_t q_lock; struct nvme_command *sq_cmds; + struct nvme_command __iomem *sq_cmds_io; volatile struct nvme_completion *cqes; struct blk_mq_tags **tags; dma_addr_t sq_dma_addr; @@ -379,27 +384,28 @@ static void *nvme_finish_cmd(struct nvme_queue *nvmeq, int tag, * * Safe to use from interrupt context */ -static int __nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) +static void __nvme_submit_cmd(struct nvme_queue *nvmeq, + struct nvme_command *cmd) { u16 tail = nvmeq->sq_tail; - memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); + if (nvmeq->sq_cmds_io) + memcpy_toio(&nvmeq->sq_cmds_io[tail], cmd, sizeof(*cmd)); + else + memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); + if (++tail == nvmeq->q_depth) tail = 0; writel(tail, nvmeq->q_db); nvmeq->sq_tail = tail; - - return 0; } -static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) +static void nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) { unsigned long flags; - int ret; spin_lock_irqsave(&nvmeq->q_lock, flags); - ret = __nvme_submit_cmd(nvmeq, cmd); + __nvme_submit_cmd(nvmeq, cmd); spin_unlock_irqrestore(&nvmeq->q_lock, flags); - return ret; } static __le64 **iod_list(struct nvme_iod *iod) @@ -730,18 +736,16 @@ static int nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod, static void nvme_submit_priv(struct nvme_queue *nvmeq, struct request *req, struct nvme_iod *iod) { - struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; + struct nvme_command cmnd; - memcpy(cmnd, req->cmd, sizeof(struct nvme_command)); - cmnd->rw.command_id = req->tag; + memcpy(&cmnd, req->cmd, sizeof(cmnd)); + cmnd.rw.command_id = req->tag; if (req->nr_phys_segments) { - cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); - cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); + cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); + cmnd.rw.prp2 = cpu_to_le64(iod->first_dma); } - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + __nvme_submit_cmd(nvmeq, &cmnd); } /* @@ -754,45 +758,41 @@ static void nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, { struct nvme_dsm_range *range = (struct nvme_dsm_range *)iod_list(iod)[0]; - struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; + struct nvme_command cmnd; range->cattr = cpu_to_le32(0); range->nlb = cpu_to_le32(blk_rq_bytes(req) >> ns->lba_shift); range->slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); - memset(cmnd, 0, sizeof(*cmnd)); - cmnd->dsm.opcode = nvme_cmd_dsm; - cmnd->dsm.command_id = req->tag; - cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); - cmnd->dsm.prp1 = cpu_to_le64(iod->first_dma); - cmnd->dsm.nr = 0; - cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); + memset(&cmnd, 0, sizeof(cmnd)); + cmnd.dsm.opcode = nvme_cmd_dsm; + cmnd.dsm.command_id = req->tag; + cmnd.dsm.nsid = cpu_to_le32(ns->ns_id); + cmnd.dsm.prp1 = cpu_to_le64(iod->first_dma); + cmnd.dsm.nr = 0; + cmnd.dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + __nvme_submit_cmd(nvmeq, &cmnd); } static void nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns, int cmdid) { - struct nvme_command *cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; + struct nvme_command cmnd; - memset(cmnd, 0, sizeof(*cmnd)); - cmnd->common.opcode = nvme_cmd_flush; - cmnd->common.command_id = cmdid; - cmnd->common.nsid = cpu_to_le32(ns->ns_id); + memset(&cmnd, 0, sizeof(cmnd)); + cmnd.common.opcode = nvme_cmd_flush; + cmnd.common.command_id = cmdid; + cmnd.common.nsid = cpu_to_le32(ns->ns_id); - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + __nvme_submit_cmd(nvmeq, &cmnd); } static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod, struct nvme_ns *ns) { struct request *req = iod_get_private(iod); - struct nvme_command *cmnd; + struct nvme_command cmnd; u16 control = 0; u32 dsmgmt = 0; @@ -804,19 +804,16 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod, if (req->cmd_flags & REQ_RAHEAD) dsmgmt |= NVME_RW_DSM_FREQ_PREFETCH; - cmnd = &nvmeq->sq_cmds[nvmeq->sq_tail]; - memset(cmnd, 0, sizeof(*cmnd)); + memset(&cmnd, 0, sizeof(cmnd)); + cmnd.rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); + cmnd.rw.command_id = req->tag; + cmnd.rw.nsid = cpu_to_le32(ns->ns_id); + cmnd.rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); + cmnd.rw.prp2 = cpu_to_le64(iod->first_dma); + cmnd.rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); + cmnd.rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); - cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); - cmnd->rw.command_id = req->tag; - cmnd->rw.nsid = cpu_to_le32(ns->ns_id); - cmnd->rw.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); - cmnd->rw.prp2 = cpu_to_le64(iod->first_dma); - cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); - cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); - - if (blk_integrity_rq(req)) { - cmnd->rw.metadata = cpu_to_le64(sg_dma_address(iod->meta_sg)); + if (ns->ms) { switch (ns->pi_type) { case NVME_NS_DPS_PI_TYPE3: control |= NVME_RW_PRINFO_PRCHK_GUARD; @@ -825,19 +822,21 @@ static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod, case NVME_NS_DPS_PI_TYPE2: control |= NVME_RW_PRINFO_PRCHK_GUARD | NVME_RW_PRINFO_PRCHK_REF; - cmnd->rw.reftag = cpu_to_le32( + cmnd.rw.reftag = cpu_to_le32( nvme_block_nr(ns, blk_rq_pos(req))); break; } - } else if (ns->ms) - control |= NVME_RW_PRINFO_PRACT; + if (blk_integrity_rq(req)) + cmnd.rw.metadata = + cpu_to_le64(sg_dma_address(iod->meta_sg)); + else + control |= NVME_RW_PRINFO_PRACT; + } - cmnd->rw.control = cpu_to_le16(control); - cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); + cmnd.rw.control = cpu_to_le16(control); + cmnd.rw.dsmgmt = cpu_to_le32(dsmgmt); - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + __nvme_submit_cmd(nvmeq, &cmnd); return 0; } @@ -1080,7 +1079,8 @@ static int nvme_submit_async_admin_req(struct nvme_dev *dev) c.common.command_id = req->tag; blk_mq_free_request(req); - return __nvme_submit_cmd(nvmeq, &c); + __nvme_submit_cmd(nvmeq, &c); + return 0; } static int nvme_submit_admin_async_cmd(struct nvme_dev *dev, @@ -1103,7 +1103,8 @@ static int nvme_submit_admin_async_cmd(struct nvme_dev *dev, cmd->common.command_id = req->tag; - return nvme_submit_cmd(nvmeq, cmd); + nvme_submit_cmd(nvmeq, cmd); + return 0; } static int adapter_delete_queue(struct nvme_dev *dev, u8 opcode, u16 id) @@ -1315,12 +1316,7 @@ static void nvme_abort_req(struct request *req) dev_warn(nvmeq->q_dmadev, "Aborting I/O %d QID %d\n", req->tag, nvmeq->qid); - if (nvme_submit_cmd(dev->queues[0], &cmd) < 0) { - dev_warn(nvmeq->q_dmadev, - "Could not abort I/O %d QID %d", - req->tag, nvmeq->qid); - blk_mq_free_request(abort_req); - } + nvme_submit_cmd(dev->queues[0], &cmd); } static void nvme_cancel_queue_ios(struct request *req, void *data, bool reserved) @@ -1374,7 +1370,8 @@ static void nvme_free_queue(struct nvme_queue *nvmeq) { dma_free_coherent(nvmeq->q_dmadev, CQ_SIZE(nvmeq->q_depth), (void *)nvmeq->cqes, nvmeq->cq_dma_addr); - dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), + if (nvmeq->sq_cmds) + dma_free_coherent(nvmeq->q_dmadev, SQ_SIZE(nvmeq->q_depth), nvmeq->sq_cmds, nvmeq->sq_dma_addr); kfree(nvmeq); } @@ -1447,6 +1444,47 @@ static void nvme_disable_queue(struct nvme_dev *dev, int qid) spin_unlock_irq(&nvmeq->q_lock); } +static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues, + int entry_size) +{ + int q_depth = dev->q_depth; + unsigned q_size_aligned = roundup(q_depth * entry_size, dev->page_size); + + if (q_size_aligned * nr_io_queues > dev->cmb_size) { + u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues); + mem_per_q = round_down(mem_per_q, dev->page_size); + q_depth = div_u64(mem_per_q, entry_size); + + /* + * Ensure the reduced q_depth is above some threshold where it + * would be better to map queues in system memory with the + * original depth + */ + if (q_depth < 64) + return -ENOMEM; + } + + return q_depth; +} + +static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq, + int qid, int depth) +{ + if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) { + unsigned offset = (qid - 1) * + roundup(SQ_SIZE(depth), dev->page_size); + nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset; + nvmeq->sq_cmds_io = dev->cmb + offset; + } else { + nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), + &nvmeq->sq_dma_addr, GFP_KERNEL); + if (!nvmeq->sq_cmds) + return -ENOMEM; + } + + return 0; +} + static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, int depth) { @@ -1459,9 +1497,7 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, if (!nvmeq->cqes) goto free_nvmeq; - nvmeq->sq_cmds = dma_alloc_coherent(dev->dev, SQ_SIZE(depth), - &nvmeq->sq_dma_addr, GFP_KERNEL); - if (!nvmeq->sq_cmds) + if (nvme_alloc_sq_cmds(dev, nvmeq, qid, depth)) goto free_cqdma; nvmeq->q_dmadev = dev->dev; @@ -1696,6 +1732,12 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev) page_shift = dev_page_max; } + dev->subsystem = readl(&dev->bar->vs) >= NVME_VS(1, 1) ? + NVME_CAP_NSSRC(cap) : 0; + + if (dev->subsystem && (readl(&dev->bar->csts) & NVME_CSTS_NSSRO)) + writel(NVME_CSTS_NSSRO, &dev->bar->csts); + result = nvme_disable_ctrl(dev, cap); if (result < 0) return result; @@ -1856,6 +1898,15 @@ static int nvme_user_cmd(struct nvme_dev *dev, struct nvme_ns *ns, return status; } +static int nvme_subsys_reset(struct nvme_dev *dev) +{ + if (!dev->subsystem) + return -ENOTTY; + + writel(0x4E564D65, &dev->bar->nssr); /* "NVMe" */ + return 0; +} + static int nvme_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { @@ -1989,7 +2040,7 @@ static int nvme_revalidate_disk(struct gendisk *disk) !ns->ext) nvme_init_integrity(ns); - if (ns->ms && !blk_get_integrity(disk)) + if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) set_capacity(disk, 0); else set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); @@ -2020,7 +2071,10 @@ static int nvme_kthread(void *data) spin_lock(&dev_list_lock); list_for_each_entry_safe(dev, next, &dev_list, node) { int i; - if (readl(&dev->bar->csts) & NVME_CSTS_CFS) { + u32 csts = readl(&dev->bar->csts); + + if ((dev->subsystem && (csts & NVME_CSTS_NSSRO)) || + csts & NVME_CSTS_CFS) { if (work_busy(&dev->reset_work)) continue; list_del_init(&dev->node); @@ -2080,8 +2134,11 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid) list_add_tail(&ns->list, &dev->namespaces); blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); - if (dev->max_hw_sectors) + if (dev->max_hw_sectors) { blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors); + blk_queue_max_segments(ns->queue, + ((dev->max_hw_sectors << 9) / dev->page_size) + 1); + } if (dev->stripe_size) blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9); if (dev->vwc & NVME_CTRL_VWC_PRESENT) @@ -2159,6 +2216,58 @@ static int set_queue_count(struct nvme_dev *dev, int count) return min(result & 0xffff, result >> 16) + 1; } +static void __iomem *nvme_map_cmb(struct nvme_dev *dev) +{ + u64 szu, size, offset; + u32 cmbloc; + resource_size_t bar_size; + struct pci_dev *pdev = to_pci_dev(dev->dev); + void __iomem *cmb; + dma_addr_t dma_addr; + + if (!use_cmb_sqes) + return NULL; + + dev->cmbsz = readl(&dev->bar->cmbsz); + if (!(NVME_CMB_SZ(dev->cmbsz))) + return NULL; + + cmbloc = readl(&dev->bar->cmbloc); + + szu = (u64)1 << (12 + 4 * NVME_CMB_SZU(dev->cmbsz)); + size = szu * NVME_CMB_SZ(dev->cmbsz); + offset = szu * NVME_CMB_OFST(cmbloc); + bar_size = pci_resource_len(pdev, NVME_CMB_BIR(cmbloc)); + + if (offset > bar_size) + return NULL; + + /* + * Controllers may support a CMB size larger than their BAR, + * for example, due to being behind a bridge. Reduce the CMB to + * the reported size of the BAR + */ + if (size > bar_size - offset) + size = bar_size - offset; + + dma_addr = pci_resource_start(pdev, NVME_CMB_BIR(cmbloc)) + offset; + cmb = ioremap_wc(dma_addr, size); + if (!cmb) + return NULL; + + dev->cmb_dma_addr = dma_addr; + dev->cmb_size = size; + return cmb; +} + +static inline void nvme_release_cmb(struct nvme_dev *dev) +{ + if (dev->cmb) { + iounmap(dev->cmb); + dev->cmb = NULL; + } +} + static size_t db_bar_size(struct nvme_dev *dev, unsigned nr_io_queues) { return 4096 + ((nr_io_queues + 1) * 8 * dev->db_stride); @@ -2177,6 +2286,15 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) if (result < nr_io_queues) nr_io_queues = result; + if (dev->cmb && NVME_CMB_SQS(dev->cmbsz)) { + result = nvme_cmb_qdepth(dev, nr_io_queues, + sizeof(struct nvme_command)); + if (result > 0) + dev->q_depth = result; + else + nvme_release_cmb(dev); + } + size = db_bar_size(dev, nr_io_queues); if (size > 8192) { iounmap(dev->bar); @@ -2344,7 +2462,6 @@ static int nvme_dev_add(struct nvme_dev *dev) { struct pci_dev *pdev = to_pci_dev(dev->dev); int res; - unsigned nn; struct nvme_id_ctrl *ctrl; int shift = NVME_CAP_MPSMIN(readq(&dev->bar->cap)) + 12; @@ -2354,7 +2471,6 @@ static int nvme_dev_add(struct nvme_dev *dev) return -EIO; } - nn = le32_to_cpup(&ctrl->nn); dev->oncs = le16_to_cpup(&ctrl->oncs); dev->abort_limit = ctrl->acl + 1; dev->vwc = ctrl->vwc; @@ -2440,6 +2556,8 @@ static int nvme_dev_map(struct nvme_dev *dev) dev->q_depth = min_t(int, NVME_CAP_MQES(cap) + 1, NVME_Q_DEPTH); dev->db_stride = 1 << NVME_CAP_STRIDE(cap); dev->dbs = ((void __iomem *)dev->bar) + 4096; + if (readl(&dev->bar->vs) >= NVME_VS(1, 2)) + dev->cmb = nvme_map_cmb(dev); return 0; @@ -2820,6 +2938,8 @@ static long nvme_dev_ioctl(struct file *f, unsigned int cmd, unsigned long arg) case NVME_IOCTL_RESET: dev_warn(dev->dev, "resetting controller\n"); return nvme_reset(dev); + case NVME_IOCTL_SUBSYS_RESET: + return nvme_subsys_reset(dev); default: return -ENOTTY; } @@ -3145,6 +3265,7 @@ static void nvme_remove(struct pci_dev *pdev) nvme_dev_remove_admin(dev); device_destroy(nvme_class, MKDEV(nvme_char_major, dev->instance)); nvme_free_queues(dev, 0); + nvme_release_cmb(dev); nvme_release_prp_pools(dev); kref_put(&dev->kref, nvme_free_dev); } |