From 60e2364e60e86e81bc6377f49779779e6120977f Mon Sep 17 00:00:00 2001 From: Stephane Eranian Date: Wed, 24 Sep 2014 13:48:37 +0200 Subject: perf: Add ability to sample machine state on interrupt Enable capture of interrupted machine state for each sample. Registers to sample are passed per event in the sample_regs_intr bitmask. To sample interrupt machine state, the PERF_SAMPLE_INTR_REGS must be passed in sample_type. The list of available registers is arch dependent and provided by asm/perf_regs.h Registers are laid out as u64 in the order of the bit order of sample_intr_regs. This patch also adds a new ABI version PERF_ATTR_SIZE_VER4 because we extend the perf_event_attr struct with a new u64 field. Reviewed-by: Jiri Olsa Signed-off-by: Stephane Eranian Signed-off-by: Peter Zijlstra (Intel) Cc: cebbert.lkml@gmail.com Cc: Arnaldo Carvalho de Melo Cc: Linus Torvalds Cc: linux-api@vger.kernel.org Link: http://lkml.kernel.org/r/1411559322-16548-2-git-send-email-eranian@google.com Signed-off-by: Ingo Molnar --- include/uapi/linux/perf_event.h | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h index 9d845404d875..9b79abbd1ab8 100644 --- a/include/uapi/linux/perf_event.h +++ b/include/uapi/linux/perf_event.h @@ -137,8 +137,9 @@ enum perf_event_sample_format { PERF_SAMPLE_DATA_SRC = 1U << 15, PERF_SAMPLE_IDENTIFIER = 1U << 16, PERF_SAMPLE_TRANSACTION = 1U << 17, + PERF_SAMPLE_REGS_INTR = 1U << 18, - PERF_SAMPLE_MAX = 1U << 18, /* non-ABI */ + PERF_SAMPLE_MAX = 1U << 19, /* non-ABI */ }; /* @@ -238,6 +239,7 @@ enum perf_event_read_format { #define PERF_ATTR_SIZE_VER2 80 /* add: branch_sample_type */ #define PERF_ATTR_SIZE_VER3 96 /* add: sample_regs_user */ /* add: sample_stack_user */ +#define PERF_ATTR_SIZE_VER4 104 /* add: sample_regs_intr */ /* * Hardware event_id to monitor via a performance monitoring event: @@ -334,6 +336,15 @@ struct perf_event_attr { /* Align to u64. */ __u32 __reserved_2; + /* + * Defines set of regs to dump for each sample + * state captured on: + * - precise = 0: PMU interrupt + * - precise > 0: sampled instruction + * + * See asm/perf_regs.h for details. + */ + __u64 sample_regs_intr; }; #define perf_flags(attr) (*(&(attr)->read_format + 1)) @@ -686,6 +697,8 @@ enum perf_event_type { * { u64 weight; } && PERF_SAMPLE_WEIGHT * { u64 data_src; } && PERF_SAMPLE_DATA_SRC * { u64 transaction; } && PERF_SAMPLE_TRANSACTION + * { u64 abi; # enum perf_sample_regs_abi + * u64 regs[weight(mask)]; } && PERF_SAMPLE_REGS_INTR * }; */ PERF_RECORD_SAMPLE = 9, -- cgit v1.2.3-71-gd317 From d67ee213fa5700c7da526fe5bcccd485cfa63d8b Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Tue, 28 Oct 2014 20:13:31 -0400 Subject: dm: add presuspend_undo hook to target_type The DM thin-pool target now must undo the changes performed during pool_presuspend() so introduce presuspend_undo hook in target_type. Signed-off-by: Mike Snitzer Acked-by: Joe Thornber --- drivers/md/dm-table.c | 36 +++++++++++++++++++++++++++++------- drivers/md/dm.c | 10 ++++++++-- drivers/md/dm.h | 1 + include/linux/device-mapper.h | 2 ++ include/uapi/linux/dm-ioctl.h | 4 ++-- 5 files changed, 42 insertions(+), 11 deletions(-) (limited to 'include/uapi/linux') diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index b2bd1ebf4562..3afae9e062f8 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1521,18 +1521,32 @@ fmode_t dm_table_get_mode(struct dm_table *t) } EXPORT_SYMBOL(dm_table_get_mode); -static void suspend_targets(struct dm_table *t, unsigned postsuspend) +enum suspend_mode { + PRESUSPEND, + PRESUSPEND_UNDO, + POSTSUSPEND, +}; + +static void suspend_targets(struct dm_table *t, enum suspend_mode mode) { int i = t->num_targets; struct dm_target *ti = t->targets; while (i--) { - if (postsuspend) { + switch (mode) { + case PRESUSPEND: + if (ti->type->presuspend) + ti->type->presuspend(ti); + break; + case PRESUSPEND_UNDO: + if (ti->type->presuspend_undo) + ti->type->presuspend_undo(ti); + break; + case POSTSUSPEND: if (ti->type->postsuspend) ti->type->postsuspend(ti); - } else if (ti->type->presuspend) - ti->type->presuspend(ti); - + break; + } ti++; } } @@ -1542,7 +1556,15 @@ void dm_table_presuspend_targets(struct dm_table *t) if (!t) return; - suspend_targets(t, 0); + suspend_targets(t, PRESUSPEND); +} + +void dm_table_presuspend_undo_targets(struct dm_table *t) +{ + if (!t) + return; + + suspend_targets(t, PRESUSPEND_UNDO); } void dm_table_postsuspend_targets(struct dm_table *t) @@ -1550,7 +1572,7 @@ void dm_table_postsuspend_targets(struct dm_table *t) if (!t) return; - suspend_targets(t, 1); + suspend_targets(t, POSTSUSPEND); } int dm_table_resume_targets(struct dm_table *t) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f8cdd97c28a7..f84de3215982 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -2756,7 +2756,10 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) if (noflush) set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); - /* This does not get reverted if there's an error later. */ + /* + * This gets reverted if there's an error later and the targets + * provide the .presuspend_undo hook. + */ dm_table_presuspend_targets(map); /* @@ -2767,8 +2770,10 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) */ if (!noflush && do_lockfs) { r = lock_fs(md); - if (r) + if (r) { + dm_table_presuspend_undo_targets(map); goto out_unlock; + } } /* @@ -2816,6 +2821,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) start_queue(md->queue); unlock_fs(md); + dm_table_presuspend_undo_targets(map); goto out_unlock; /* pushback list is already flushed, so skip flush */ } diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 988c7fb7b145..781994093bf5 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -65,6 +65,7 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, struct queue_limits *limits); struct list_head *dm_table_get_devices(struct dm_table *t); void dm_table_presuspend_targets(struct dm_table *t); +void dm_table_presuspend_undo_targets(struct dm_table *t); void dm_table_postsuspend_targets(struct dm_table *t); int dm_table_resume_targets(struct dm_table *t); int dm_table_any_congested(struct dm_table *t, int bdi_bits); diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index e1707de043ae..ca6d2acc5eb7 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -64,6 +64,7 @@ typedef int (*dm_request_endio_fn) (struct dm_target *ti, union map_info *map_context); typedef void (*dm_presuspend_fn) (struct dm_target *ti); +typedef void (*dm_presuspend_undo_fn) (struct dm_target *ti); typedef void (*dm_postsuspend_fn) (struct dm_target *ti); typedef int (*dm_preresume_fn) (struct dm_target *ti); typedef void (*dm_resume_fn) (struct dm_target *ti); @@ -145,6 +146,7 @@ struct target_type { dm_endio_fn end_io; dm_request_endio_fn rq_end_io; dm_presuspend_fn presuspend; + dm_presuspend_undo_fn presuspend_undo; dm_postsuspend_fn postsuspend; dm_preresume_fn preresume; dm_resume_fn resume; diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h index 3315ab21f728..2be66f4be2f9 100644 --- a/include/uapi/linux/dm-ioctl.h +++ b/include/uapi/linux/dm-ioctl.h @@ -267,9 +267,9 @@ enum { #define DM_DEV_SET_GEOMETRY _IOWR(DM_IOCTL, DM_DEV_SET_GEOMETRY_CMD, struct dm_ioctl) #define DM_VERSION_MAJOR 4 -#define DM_VERSION_MINOR 28 +#define DM_VERSION_MINOR 29 #define DM_VERSION_PATCHLEVEL 0 -#define DM_VERSION_EXTRA "-ioctl (2014-09-17)" +#define DM_VERSION_EXTRA "-ioctl (2014-10-28)" /* Status bits */ #define DM_READONLY_FLAG (1 << 0) /* In/Out */ -- cgit v1.2.3-71-gd317 From ffcc39364160663cda1a3c358f4537302a92459b Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Tue, 28 Oct 2014 18:34:52 -0400 Subject: dm: enhance internal suspend and resume interface Rename dm_internal_{suspend,resume} to dm_internal_{suspend,resume}_fast -- dm-stats will continue using these methods to avoid all the extra suspend/resume logic that is not needed in order to quickly flush IO. Introduce dm_internal_suspend_noflush() variant that actually calls the mapped_device's target callbacks -- otherwise target-specific hooks are avoided (e.g. dm-thin's thin_presuspend and thin_postsuspend). Common code between dm_internal_{suspend_noflush,resume} and dm_{suspend,resume} was factored out as __dm_{suspend,resume}. Update dm_internal_{suspend_noflush,resume} to always take and release the mapped_device's suspend_lock. Also update dm_{suspend,resume} to be aware of potential for DM_INTERNAL_SUSPEND_FLAG to be set and respond accordingly by interruptibly waiting for the DM_INTERNAL_SUSPEND_FLAG to be cleared. Add lockdep annotation to dm_suspend() and dm_resume(). The existing DM_SUSPEND_FLAG remains unchanged. DM_INTERNAL_SUSPEND_FLAG is set by dm_internal_suspend_noflush() and cleared by dm_internal_resume(). Both DM_SUSPEND_FLAG and DM_INTERNAL_SUSPEND_FLAG may be set if a device was already suspended when dm_internal_suspend_noflush() was called -- this can be thought of as a "nested suspend". A "nested suspend" can occur with legacy userspace dm-thin code that might suspend all active thin volumes before suspending the pool for resize. But otherwise, in the normal dm-thin-pool suspend case moving forward: the thin-pool will have DM_SUSPEND_FLAG set and all active thins from that thin-pool will have DM_INTERNAL_SUSPEND_FLAG set. Also add DM_INTERNAL_SUSPEND_FLAG to status report. This new DM_INTERNAL_SUSPEND_FLAG state is being reported to assist with debugging (e.g. 'dmsetup info' will report an internally suspended device accordingly). Signed-off-by: Mike Snitzer Acked-by: Joe Thornber --- drivers/md/dm-ioctl.c | 5 +- drivers/md/dm-stats.c | 2 +- drivers/md/dm.c | 229 +++++++++++++++++++++++++++++++----------- drivers/md/dm.h | 9 ++ include/uapi/linux/dm-ioctl.h | 5 + 5 files changed, 192 insertions(+), 58 deletions(-) (limited to 'include/uapi/linux') diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 0be9381365d7..73f791bb9ea4 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -684,11 +684,14 @@ static void __dev_status(struct mapped_device *md, struct dm_ioctl *param) int srcu_idx; param->flags &= ~(DM_SUSPEND_FLAG | DM_READONLY_FLAG | - DM_ACTIVE_PRESENT_FLAG); + DM_ACTIVE_PRESENT_FLAG | DM_INTERNAL_SUSPEND_FLAG); if (dm_suspended_md(md)) param->flags |= DM_SUSPEND_FLAG; + if (dm_suspended_internally_md(md)) + param->flags |= DM_INTERNAL_SUSPEND_FLAG; + if (dm_test_deferred_remove_flag(md)) param->flags |= DM_DEFERRED_REMOVE; diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c index 28a90122a5a8..42a057aa3811 100644 --- a/drivers/md/dm-stats.c +++ b/drivers/md/dm-stats.c @@ -824,7 +824,7 @@ static int message_stats_create(struct mapped_device *md, return 1; id = dm_stats_create(dm_get_stats(md), start, end, step, program_id, aux_data, - dm_internal_suspend, dm_internal_resume, md); + dm_internal_suspend_fast, dm_internal_resume_fast, md); if (id < 0) return id; diff --git a/drivers/md/dm.c b/drivers/md/dm.c index f84de3215982..a0ece87ad426 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -19,6 +19,7 @@ #include #include #include +#include #include @@ -117,6 +118,7 @@ EXPORT_SYMBOL_GPL(dm_get_rq_mapinfo); #define DMF_NOFLUSH_SUSPENDING 5 #define DMF_MERGE_IS_OPTIONAL 6 #define DMF_DEFERRED_REMOVE 7 +#define DMF_SUSPENDED_INTERNALLY 8 /* * A dummy definition to make RCU happy. @@ -2718,36 +2720,18 @@ static void unlock_fs(struct mapped_device *md) } /* - * We need to be able to change a mapping table under a mounted - * filesystem. For example we might want to move some data in - * the background. Before the table can be swapped with - * dm_bind_table, dm_suspend must be called to flush any in - * flight bios and ensure that any further io gets deferred. - */ -/* - * Suspend mechanism in request-based dm. - * - * 1. Flush all I/Os by lock_fs() if needed. - * 2. Stop dispatching any I/O by stopping the request_queue. - * 3. Wait for all in-flight I/Os to be completed or requeued. + * If __dm_suspend returns 0, the device is completely quiescent + * now. There is no request-processing activity. All new requests + * are being added to md->deferred list. * - * To abort suspend, start the request_queue. + * Caller must hold md->suspend_lock */ -int dm_suspend(struct mapped_device *md, unsigned suspend_flags) +static int __dm_suspend(struct mapped_device *md, struct dm_table *map, + unsigned suspend_flags, int interruptible) { - struct dm_table *map = NULL; - int r = 0; - int do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG ? 1 : 0; - int noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG ? 1 : 0; - - mutex_lock(&md->suspend_lock); - - if (dm_suspended_md(md)) { - r = -EINVAL; - goto out_unlock; - } - - map = rcu_dereference(md->map); + bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG; + bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG; + int r; /* * DMF_NOFLUSH_SUSPENDING must be set before presuspend. @@ -2772,7 +2756,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) r = lock_fs(md); if (r) { dm_table_presuspend_undo_targets(map); - goto out_unlock; + return r; } } @@ -2806,7 +2790,7 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) * We call dm_wait_for_completion to wait for all existing requests * to finish. */ - r = dm_wait_for_completion(md, TASK_INTERRUPTIBLE); + r = dm_wait_for_completion(md, interruptible); if (noflush) clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags); @@ -2822,14 +2806,55 @@ int dm_suspend(struct mapped_device *md, unsigned suspend_flags) unlock_fs(md); dm_table_presuspend_undo_targets(map); - goto out_unlock; /* pushback list is already flushed, so skip flush */ + /* pushback list is already flushed, so skip flush */ } - /* - * If dm_wait_for_completion returned 0, the device is completely - * quiescent now. There is no request-processing activity. All new - * requests are being added to md->deferred list. - */ + return r; +} + +/* + * We need to be able to change a mapping table under a mounted + * filesystem. For example we might want to move some data in + * the background. Before the table can be swapped with + * dm_bind_table, dm_suspend must be called to flush any in + * flight bios and ensure that any further io gets deferred. + */ +/* + * Suspend mechanism in request-based dm. + * + * 1. Flush all I/Os by lock_fs() if needed. + * 2. Stop dispatching any I/O by stopping the request_queue. + * 3. Wait for all in-flight I/Os to be completed or requeued. + * + * To abort suspend, start the request_queue. + */ +int dm_suspend(struct mapped_device *md, unsigned suspend_flags) +{ + struct dm_table *map = NULL; + int r = 0; + +retry: + mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); + + if (dm_suspended_md(md)) { + r = -EINVAL; + goto out_unlock; + } + + if (dm_suspended_internally_md(md)) { + /* already internally suspended, wait for internal resume */ + mutex_unlock(&md->suspend_lock); + r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); + if (r) + return r; + goto retry; + } + + map = rcu_dereference(md->map); + + r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE); + if (r) + goto out_unlock; set_bit(DMF_SUSPENDED, &md->flags); @@ -2840,35 +2865,57 @@ out_unlock: return r; } +static int __dm_resume(struct mapped_device *md, struct dm_table *map) +{ + if (map) { + int r = dm_table_resume_targets(map); + if (r) + return r; + } + + dm_queue_flush(md); + + /* + * Flushing deferred I/Os must be done after targets are resumed + * so that mapping of targets can work correctly. + * Request-based dm is queueing the deferred I/Os in its request_queue. + */ + if (dm_request_based(md)) + start_queue(md->queue); + + unlock_fs(md); + + return 0; +} + int dm_resume(struct mapped_device *md) { int r = -EINVAL; struct dm_table *map = NULL; - mutex_lock(&md->suspend_lock); +retry: + mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING); + if (!dm_suspended_md(md)) goto out; + if (dm_suspended_internally_md(md)) { + /* already internally suspended, wait for internal resume */ + mutex_unlock(&md->suspend_lock); + r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE); + if (r) + return r; + goto retry; + } + map = rcu_dereference(md->map); if (!map || !dm_table_get_size(map)) goto out; - r = dm_table_resume_targets(map); + r = __dm_resume(md, map); if (r) goto out; - dm_queue_flush(md); - - /* - * Flushing deferred I/Os must be done after targets are resumed - * so that mapping of targets can work correctly. - * Request-based dm is queueing the deferred I/Os in its request_queue. - */ - if (dm_request_based(md)) - start_queue(md->queue); - - unlock_fs(md); - clear_bit(DMF_SUSPENDED, &md->flags); r = 0; @@ -2882,15 +2929,80 @@ out: * Internal suspend/resume works like userspace-driven suspend. It waits * until all bios finish and prevents issuing new bios to the target drivers. * It may be used only from the kernel. - * - * Internal suspend holds md->suspend_lock, which prevents interaction with - * userspace-driven suspend. */ -void dm_internal_suspend(struct mapped_device *md) +static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags) { - mutex_lock(&md->suspend_lock); + struct dm_table *map = NULL; + + if (dm_suspended_internally_md(md)) + return; /* nested internal suspend */ + + if (dm_suspended_md(md)) { + set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); + return; /* nest suspend */ + } + + map = rcu_dereference(md->map); + + /* + * Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is + * supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend + * would require changing .presuspend to return an error -- avoid this + * until there is a need for more elaborate variants of internal suspend. + */ + (void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE); + + set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); + + dm_table_postsuspend_targets(map); +} + +static void __dm_internal_resume(struct mapped_device *md) +{ + if (!dm_suspended_internally_md(md)) + return; /* resume from nested internal suspend */ + if (dm_suspended_md(md)) + goto done; /* resume from nested suspend */ + + /* + * NOTE: existing callers don't need to call dm_table_resume_targets + * (which may fail -- so best to avoid it for now by passing NULL map) + */ + (void) __dm_resume(md, NULL); + +done: + clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); + smp_mb__after_atomic(); + wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY); +} + +void dm_internal_suspend_noflush(struct mapped_device *md) +{ + mutex_lock(&md->suspend_lock); + __dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG); + mutex_unlock(&md->suspend_lock); +} +EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush); + +void dm_internal_resume(struct mapped_device *md) +{ + mutex_lock(&md->suspend_lock); + __dm_internal_resume(md); + mutex_unlock(&md->suspend_lock); +} +EXPORT_SYMBOL_GPL(dm_internal_resume); + +/* + * Fast variants of internal suspend/resume hold md->suspend_lock, + * which prevents interaction with userspace-driven suspend. + */ + +void dm_internal_suspend_fast(struct mapped_device *md) +{ + mutex_lock(&md->suspend_lock); + if (dm_suspended_md(md) || dm_suspended_internally_md(md)) return; set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags); @@ -2899,9 +3011,9 @@ void dm_internal_suspend(struct mapped_device *md) dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE); } -void dm_internal_resume(struct mapped_device *md) +void dm_internal_resume_fast(struct mapped_device *md) { - if (dm_suspended_md(md)) + if (dm_suspended_md(md) || dm_suspended_internally_md(md)) goto done; dm_queue_flush(md); @@ -2987,6 +3099,11 @@ int dm_suspended_md(struct mapped_device *md) return test_bit(DMF_SUSPENDED, &md->flags); } +int dm_suspended_internally_md(struct mapped_device *md) +{ + return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags); +} + int dm_test_deferred_remove_flag(struct mapped_device *md) { return test_bit(DMF_DEFERRED_REMOVE, &md->flags); diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 781994093bf5..84b0f9e4ba6c 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -129,6 +129,15 @@ int dm_deleting_md(struct mapped_device *md); */ int dm_suspended_md(struct mapped_device *md); +/* + * Internal suspend and resume methods. + */ +int dm_suspended_internally_md(struct mapped_device *md); +void dm_internal_suspend_fast(struct mapped_device *md); +void dm_internal_resume_fast(struct mapped_device *md); +void dm_internal_suspend_noflush(struct mapped_device *md); +void dm_internal_resume(struct mapped_device *md); + /* * Test if the device is scheduled for deferred remove. */ diff --git a/include/uapi/linux/dm-ioctl.h b/include/uapi/linux/dm-ioctl.h index 2be66f4be2f9..a570d7b5796c 100644 --- a/include/uapi/linux/dm-ioctl.h +++ b/include/uapi/linux/dm-ioctl.h @@ -352,4 +352,9 @@ enum { */ #define DM_DEFERRED_REMOVE (1 << 17) /* In/Out */ +/* + * If set, the device is suspended internally. + */ +#define DM_INTERNAL_SUSPEND_FLAG (1 << 18) /* Out */ + #endif /* _LINUX_DM_IOCTL_H */ -- cgit v1.2.3-71-gd317 From 766a85d7bc5d7f1ddd6de28bdb844eae45ec63b0 Mon Sep 17 00:00:00 2001 From: AKASHI Takahiro Date: Fri, 28 Nov 2014 05:26:34 +0000 Subject: arm64: ptrace: add NT_ARM_SYSTEM_CALL regset This regeset is intended to be used to get and set a system call number while tracing. There was some discussion about possible approaches to do so: (1) modify x8 register with ptrace(PTRACE_SETREGSET) indirectly, and update regs->syscallno later on in syscall_trace_enter(), or (2) define a dedicated regset for this purpose as on s390, or (3) support ptrace(PTRACE_SET_SYSCALL) as on arch/arm Thinking of the fact that user_pt_regs doesn't expose 'syscallno' to tracer as well as that secure_computing() expects a changed syscall number, especially case of -1, to be visible before this function returns in syscall_trace_enter(), (1) doesn't work well. We will take (2) since it looks much cleaner. Signed-off-by: AKASHI Takahiro Signed-off-by: Will Deacon --- arch/arm64/kernel/ptrace.c | 35 +++++++++++++++++++++++++++++++++++ include/uapi/linux/elf.h | 1 + 2 files changed, 36 insertions(+) (limited to 'include/uapi/linux') diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c index 8a4ae8e73213..f576781d8d3b 100644 --- a/arch/arm64/kernel/ptrace.c +++ b/arch/arm64/kernel/ptrace.c @@ -551,6 +551,32 @@ static int tls_set(struct task_struct *target, const struct user_regset *regset, return ret; } +static int system_call_get(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + void *kbuf, void __user *ubuf) +{ + int syscallno = task_pt_regs(target)->syscallno; + + return user_regset_copyout(&pos, &count, &kbuf, &ubuf, + &syscallno, 0, -1); +} + +static int system_call_set(struct task_struct *target, + const struct user_regset *regset, + unsigned int pos, unsigned int count, + const void *kbuf, const void __user *ubuf) +{ + int syscallno, ret; + + ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &syscallno, 0, -1); + if (ret) + return ret; + + task_pt_regs(target)->syscallno = syscallno; + return ret; +} + enum aarch64_regset { REGSET_GPR, REGSET_FPR, @@ -559,6 +585,7 @@ enum aarch64_regset { REGSET_HW_BREAK, REGSET_HW_WATCH, #endif + REGSET_SYSTEM_CALL, }; static const struct user_regset aarch64_regsets[] = { @@ -608,6 +635,14 @@ static const struct user_regset aarch64_regsets[] = { .set = hw_break_set, }, #endif + [REGSET_SYSTEM_CALL] = { + .core_note_type = NT_ARM_SYSTEM_CALL, + .n = 1, + .size = sizeof(int), + .align = sizeof(int), + .get = system_call_get, + .set = system_call_set, + }, }; static const struct user_regset_view user_aarch64_view = { diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h index ea9bf2561b9e..71e1d0ed92f7 100644 --- a/include/uapi/linux/elf.h +++ b/include/uapi/linux/elf.h @@ -397,6 +397,7 @@ typedef struct elf64_shdr { #define NT_ARM_TLS 0x401 /* ARM TLS register */ #define NT_ARM_HW_BREAK 0x402 /* ARM hardware breakpoint registers */ #define NT_ARM_HW_WATCH 0x403 /* ARM hardware watchpoint registers */ +#define NT_ARM_SYSTEM_CALL 0x404 /* ARM system call number */ #define NT_METAG_CBUF 0x500 /* Metag catch buffer registers */ #define NT_METAG_RPIPE 0x501 /* Metag read pipeline state */ #define NT_METAG_TLS 0x502 /* Metag TLS pointer */ -- cgit v1.2.3-71-gd317 From d0747f10ed5fec3d1f40c4b350dc9673011fc8e2 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Thu, 4 Dec 2014 14:42:25 -0800 Subject: uapi: fix to export linux/vm_sockets.h A typo "header=y" was introduced by commit 7071cf7fc435 ("uapi: add missing network related headers to kbuild"). Signed-off-by: Masahiro Yamada Cc: Stephen Hemminger Cc: David Miller Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/uapi/linux/Kbuild | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/Kbuild b/include/uapi/linux/Kbuild index 4c94f31a8c99..8523f9bb72f2 100644 --- a/include/uapi/linux/Kbuild +++ b/include/uapi/linux/Kbuild @@ -427,7 +427,7 @@ header-y += virtio_net.h header-y += virtio_pci.h header-y += virtio_ring.h header-y += virtio_rng.h -header=y += vm_sockets.h +header-y += vm_sockets.h header-y += vt.h header-y += wait.h header-y += wanrouter.h -- cgit v1.2.3-71-gd317 From 4fdace8d4f8bee9ba163646e8530394f9c36e67e Mon Sep 17 00:00:00 2001 From: Ley Foon Tan Date: Thu, 6 Nov 2014 15:19:54 +0800 Subject: Add ELF machine define for Nios2 Signed-off-by: Ley Foon Tan Acked-by: Arnd Bergmann --- include/uapi/linux/elf-em.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/elf-em.h b/include/uapi/linux/elf-em.h index aa90bc98b6e2..ae99f7743cf4 100644 --- a/include/uapi/linux/elf-em.h +++ b/include/uapi/linux/elf-em.h @@ -34,6 +34,7 @@ #define EM_MN10300 89 /* Panasonic/MEI MN10300, AM33 */ #define EM_OPENRISC 92 /* OpenRISC 32-bit embedded processor */ #define EM_BLACKFIN 106 /* ADI Blackfin Processor */ +#define EM_ALTERA_NIOS2 113 /* Altera Nios II soft-core processor */ #define EM_TI_C6000 140 /* TI C6X DSPs */ #define EM_AARCH64 183 /* ARM 64 bit */ #define EM_FRV 0x5441 /* Fujitsu FR-V */ -- cgit v1.2.3-71-gd317