On Thu, Jun 27, 2013 at 01:48:24PM +0200, Maarten Lankhorst wrote:
> Makes lockdep a lot more useful.
>
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/ttm/ttm_bo.c | 105 ++------------------
> drivers/gpu/drm/ttm/ttm_execbuf_util.c | 9 +-
> include/drm/ttm/ttm_bo_driver.h | 175 ++++++++++++++++++++-------------
The function movement in the header makes the diff a bit hard to read. So
if possible I think that should be avoided. Anyway I think I've spotted a
few kerneldoc updates (like s/EAGAIN/EDEADLK/) which should be part of the
main conversion patch.
-Daniel
> 3 files changed, 117 insertions(+), 172 deletions(-)
>
> diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> index 5f9fe80..a8a27f5 100644
> --- a/drivers/gpu/drm/ttm/ttm_bo.c
> +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> @@ -182,6 +182,7 @@ void ttm_bo_add_to_lru(struct ttm_buffer_object *bo)
> }
> }
> }
> +EXPORT_SYMBOL(ttm_bo_add_to_lru);
>
> int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
> {
> @@ -204,35 +205,6 @@ int ttm_bo_del_from_lru(struct ttm_buffer_object *bo)
> return put_count;
> }
>
> -int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
> - bool interruptible,
> - bool no_wait, bool use_ticket,
> - struct ww_acquire_ctx *ticket)
> -{
> - int ret = 0;
> -
> - if (no_wait) {
> - bool success;
> -
> - /* not valid any more, fix your locking! */
> - if (WARN_ON(ticket))
> - return -EBUSY;
> -
> - success = ww_mutex_trylock(&bo->resv->lock);
> - return success ? 0 : -EBUSY;
> - }
> -
> - if (interruptible)
> - ret = ww_mutex_lock_interruptible(&bo->resv->lock,
> - ticket);
> - else
> - ret = ww_mutex_lock(&bo->resv->lock, ticket);
> - if (ret == -EINTR)
> - return -ERESTARTSYS;
> - return ret;
> -}
> -EXPORT_SYMBOL(ttm_bo_reserve);
> -
> static void ttm_bo_ref_bug(struct kref *list_kref)
> {
> BUG();
> @@ -245,77 +217,16 @@ void ttm_bo_list_ref_sub(struct ttm_buffer_object *bo, int count,
> (never_free) ? ttm_bo_ref_bug : ttm_bo_release_list);
> }
>
> -int ttm_bo_reserve(struct ttm_buffer_object *bo,
> - bool interruptible,
> - bool no_wait, bool use_ticket,
> - struct ww_acquire_ctx *ticket)
> -{
> - struct ttm_bo_global *glob = bo->glob;
> - int put_count = 0;
> - int ret;
> -
> - ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
> - ticket);
> - if (likely(ret == 0)) {
> - spin_lock(&glob->lru_lock);
> - put_count = ttm_bo_del_from_lru(bo);
> - spin_unlock(&glob->lru_lock);
> - ttm_bo_list_ref_sub(bo, put_count, true);
> - }
> -
> - return ret;
> -}
> -
> -int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
> - bool interruptible, struct ww_acquire_ctx *ticket)
> -{
> - struct ttm_bo_global *glob = bo->glob;
> - int put_count = 0;
> - int ret = 0;
> -
> - if (interruptible)
> - ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
> - ticket);
> - else
> - ww_mutex_lock_slow(&bo->resv->lock, ticket);
> -
> - if (likely(ret == 0)) {
> - spin_lock(&glob->lru_lock);
> - put_count = ttm_bo_del_from_lru(bo);
> - spin_unlock(&glob->lru_lock);
> - ttm_bo_list_ref_sub(bo, put_count, true);
> - } else if (ret == -EINTR)
> - ret = -ERESTARTSYS;
> -
> - return ret;
> -}
> -EXPORT_SYMBOL(ttm_bo_reserve_slowpath);
> -
> -void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
> +void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo)
> {
> - ttm_bo_add_to_lru(bo);
> - ww_mutex_unlock(&bo->resv->lock);
> -}
> -
> -void ttm_bo_unreserve(struct ttm_buffer_object *bo)
> -{
> - struct ttm_bo_global *glob = bo->glob;
> -
> - spin_lock(&glob->lru_lock);
> - ttm_bo_unreserve_ticket_locked(bo, NULL);
> - spin_unlock(&glob->lru_lock);
> -}
> -EXPORT_SYMBOL(ttm_bo_unreserve);
> -
> -void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo, struct ww_acquire_ctx *ticket)
> -{
> - struct ttm_bo_global *glob = bo->glob;
> + int put_count;
>
> - spin_lock(&glob->lru_lock);
> - ttm_bo_unreserve_ticket_locked(bo, ticket);
> - spin_unlock(&glob->lru_lock);
> + spin_lock(&bo->glob->lru_lock);
> + put_count = ttm_bo_del_from_lru(bo);
> + spin_unlock(&bo->glob->lru_lock);
> + ttm_bo_list_ref_sub(bo, put_count, true);
> }
> -EXPORT_SYMBOL(ttm_bo_unreserve_ticket);
> +EXPORT_SYMBOL(ttm_bo_del_sub_from_lru);
>
> /*
> * Call bo->mutex locked.
> diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> index 7392da5..6c91178 100644
> --- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> +++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
> @@ -44,12 +44,10 @@ static void ttm_eu_backoff_reservation_locked(struct list_head *list,
>
> entry->reserved = false;
> if (entry->removed) {
> - ttm_bo_unreserve_ticket_locked(bo, ticket);
> + ttm_bo_add_to_lru(bo);
> entry->removed = false;
> -
> - } else {
> - ww_mutex_unlock(&bo->resv->lock);
> }
> + ww_mutex_unlock(&bo->resv->lock);
> }
> }
>
> @@ -220,7 +218,8 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
> bo = entry->bo;
> entry->old_sync_obj = bo->sync_obj;
> bo->sync_obj = driver->sync_obj_ref(sync_obj);
> - ttm_bo_unreserve_ticket_locked(bo, ticket);
> + ttm_bo_add_to_lru(bo);
> + ww_mutex_unlock(&bo->resv->lock);
> entry->reserved = false;
> }
> spin_unlock(&bdev->fence_lock);
> diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> index ec18c5f..984fc2d 100644
> --- a/include/drm/ttm/ttm_bo_driver.h
> +++ b/include/drm/ttm/ttm_bo_driver.h
> @@ -33,6 +33,7 @@
> #include <ttm/ttm_bo_api.h>
> #include <ttm/ttm_memory.h>
> #include <ttm/ttm_module.h>
> +#include <ttm/ttm_placement.h>
> #include <drm/drm_mm.h>
> #include <drm/drm_global.h>
> #include <linux/workqueue.h>
> @@ -772,6 +773,55 @@ extern int ttm_mem_io_lock(struct ttm_mem_type_manager *man,
> bool interruptible);
> extern void ttm_mem_io_unlock(struct ttm_mem_type_manager *man);
>
> +extern void ttm_bo_del_sub_from_lru(struct ttm_buffer_object *bo);
> +extern void ttm_bo_add_to_lru(struct ttm_buffer_object *bo);
> +
> +/**
> + * ttm_bo_reserve_nolru:
> + *
> + * @bo: A pointer to a struct ttm_buffer_object.
> + * @interruptible: Sleep interruptible if waiting.
> + * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
> + * @use_ticket: If @bo is already reserved, Only sleep waiting for
> + * it to become unreserved if @ticket->stamp is older.
> + *
> + * Will not remove reserved buffers from the lru lists.
> + * Otherwise identical to ttm_bo_reserve.
> + *
> + * Returns:
> + * -EDEADLK: The reservation may cause a deadlock.
> + * Release all buffer reservations, wait for @bo to become unreserved and
> + * try again. (only if use_sequence == 1).
> + * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
> + * a signal. Release all buffer reservations and return to user-space.
> + * -EBUSY: The function needed to sleep, but @no_wait was true
> + * -EALREADY: Bo already reserved using @ticket. This error code will only
> + * be returned if @use_ticket is set to true.
> + */
> +static inline int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
> + bool interruptible,
> + bool no_wait, bool use_ticket,
> + struct ww_acquire_ctx *ticket)
> +{
> + int ret = 0;
> +
> + if (no_wait) {
> + bool success;
> + if (WARN_ON(ticket))
> + return -EBUSY;
> +
> + success = ww_mutex_trylock(&bo->resv->lock);
> + return success ? 0 : -EBUSY;
> + }
> +
> + if (interruptible)
> + ret = ww_mutex_lock_interruptible(&bo->resv->lock, ticket);
> + else
> + ret = ww_mutex_lock(&bo->resv->lock, ticket);
> + if (ret == -EINTR)
> + return -ERESTARTSYS;
> + return ret;
> +}
>
> /**
> * ttm_bo_reserve:
> @@ -780,7 +830,7 @@ extern void ttm_mem_io_unlock(struct ttm_mem_type_manager *man);
> * @interruptible: Sleep interruptible if waiting.
> * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
> * @use_ticket: If @bo is already reserved, Only sleep waiting for
> - * it to become unreserved if @sequence < (@bo)->sequence.
> + * it to become unreserved if @ticket->stamp is older.
> *
> * Locks a buffer object for validation. (Or prevents other processes from
> * locking it for validation) and removes it from lru lists, while taking
> @@ -794,7 +844,7 @@ extern void ttm_mem_io_unlock(struct ttm_mem_type_manager *man);
> * Processes attempting to reserve multiple buffers other than for eviction,
> * (typically execbuf), should first obtain a unique 32-bit
> * validation sequence number,
> - * and call this function with @use_sequence == 1 and @sequence == the unique
> + * and call this function with @use_ticket == 1 and @ticket->stamp == the unique
> * sequence number. If upon call of this function, the buffer object is already
> * reserved, the validation sequence is checked against the validation
> * sequence of the process currently reserving the buffer,
> @@ -809,37 +859,31 @@ extern void ttm_mem_io_unlock(struct ttm_mem_type_manager *man);
> * will eventually succeed, preventing both deadlocks and starvation.
> *
> * Returns:
> - * -EAGAIN: The reservation may cause a deadlock.
> + * -EDEADLK: The reservation may cause a deadlock.
> * Release all buffer reservations, wait for @bo to become unreserved and
> * try again. (only if use_sequence == 1).
> * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
> * a signal. Release all buffer reservations and return to user-space.
> * -EBUSY: The function needed to sleep, but @no_wait was true
> - * -EDEADLK: Bo already reserved using @sequence. This error code will only
> - * be returned if @use_sequence is set to true.
> + * -EALREADY: Bo already reserved using @ticket. This error code will only
> + * be returned if @use_ticket is set to true.
> */
> -extern int ttm_bo_reserve(struct ttm_buffer_object *bo,
> - bool interruptible,
> - bool no_wait, bool use_ticket,
> - struct ww_acquire_ctx *ticket);
> +static inline int ttm_bo_reserve(struct ttm_buffer_object *bo,
> + bool interruptible,
> + bool no_wait, bool use_ticket,
> + struct ww_acquire_ctx *ticket)
> +{
> + int ret;
>
> -/**
> - * ttm_bo_reserve_slowpath_nolru:
> - * @bo: A pointer to a struct ttm_buffer_object.
> - * @interruptible: Sleep interruptible if waiting.
> - * @sequence: Set (@bo)->sequence to this value after lock
> - *
> - * This is called after ttm_bo_reserve returns -EAGAIN and we backed off
> - * from all our other reservations. Because there are no other reservations
> - * held by us, this function cannot deadlock any more.
> - *
> - * Will not remove reserved buffers from the lru lists.
> - * Otherwise identical to ttm_bo_reserve_slowpath.
> - */
> -extern int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
> - bool interruptible,
> - struct ww_acquire_ctx *ticket);
> + WARN_ON(!atomic_read(&bo->kref.refcount));
> +
> + ret = ttm_bo_reserve_nolru(bo, interruptible, no_wait, use_ticket,
> + ticket);
> + if (likely(ret == 0))
> + ttm_bo_del_sub_from_lru(bo);
>
> + return ret;
> +}
>
> /**
> * ttm_bo_reserve_slowpath:
> @@ -851,45 +895,27 @@ extern int ttm_bo_reserve_slowpath_nolru(struct ttm_buffer_object *bo,
> * from all our other reservations. Because there are no other reservations
> * held by us, this function cannot deadlock any more.
> */
> -extern int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
> - bool interruptible,
> - struct ww_acquire_ctx *ticket);
> +static inline int ttm_bo_reserve_slowpath(struct ttm_buffer_object *bo,
> + bool interruptible,
> + struct ww_acquire_ctx *ticket)
> +{
> + int ret = 0;
>
> -/**
> - * ttm_bo_reserve_nolru:
> - *
> - * @bo: A pointer to a struct ttm_buffer_object.
> - * @interruptible: Sleep interruptible if waiting.
> - * @no_wait: Don't sleep while trying to reserve, rather return -EBUSY.
> - * @use_sequence: If @bo is already reserved, Only sleep waiting for
> - * it to become unreserved if @sequence < (@bo)->sequence.
> - *
> - * Will not remove reserved buffers from the lru lists.
> - * Otherwise identical to ttm_bo_reserve.
> - *
> - * Returns:
> - * -EAGAIN: The reservation may cause a deadlock.
> - * Release all buffer reservations, wait for @bo to become unreserved and
> - * try again. (only if use_sequence == 1).
> - * -ERESTARTSYS: A wait for the buffer to become unreserved was interrupted by
> - * a signal. Release all buffer reservations and return to user-space.
> - * -EBUSY: The function needed to sleep, but @no_wait was true
> - * -EDEADLK: Bo already reserved using @sequence. This error code will only
> - * be returned if @use_sequence is set to true.
> - */
> -extern int ttm_bo_reserve_nolru(struct ttm_buffer_object *bo,
> - bool interruptible,
> - bool no_wait, bool use_ticket,
> - struct ww_acquire_ctx *ticket);
> + WARN_ON(!atomic_read(&bo->kref.refcount));
>
> -/**
> - * ttm_bo_unreserve
> - *
> - * @bo: A pointer to a struct ttm_buffer_object.
> - *
> - * Unreserve a previous reservation of @bo.
> - */
> -extern void ttm_bo_unreserve(struct ttm_buffer_object *bo);
> + if (interruptible)
> + ret = ww_mutex_lock_slow_interruptible(&bo->resv->lock,
> + ticket);
> + else
> + ww_mutex_lock_slow(&bo->resv->lock, ticket);
> +
> + if (likely(ret == 0))
> + ttm_bo_del_sub_from_lru(bo);
> + else if (ret == -EINTR)
> + ret = -ERESTARTSYS;
> +
> + return ret;
> +}
>
> /**
> * ttm_bo_unreserve_ticket
> @@ -898,19 +924,28 @@ extern void ttm_bo_unreserve(struct ttm_buffer_object *bo);
> *
> * Unreserve a previous reservation of @bo made with @ticket.
> */
> -extern void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo,
> - struct ww_acquire_ctx *ticket);
> +static inline void ttm_bo_unreserve_ticket(struct ttm_buffer_object *bo,
> + struct ww_acquire_ctx *t)
> +{
> + if (!(bo->mem.placement & TTM_PL_FLAG_NO_EVICT)) {
> + spin_lock(&bo->glob->lru_lock);
> + ttm_bo_add_to_lru(bo);
> + spin_unlock(&bo->glob->lru_lock);
> + }
> + ww_mutex_unlock(&bo->resv->lock);
> +}
>
> /**
> - * ttm_bo_unreserve_locked
> + * ttm_bo_unreserve
> + *
> * @bo: A pointer to a struct ttm_buffer_object.
> - * @ticket: ww_acquire_ctx used for reserving, or NULL
> *
> - * Unreserve a previous reservation of @bo made with @ticket.
> - * Needs to be called with struct ttm_bo_global::lru_lock held.
> + * Unreserve a previous reservation of @bo.
> */
> -extern void ttm_bo_unreserve_ticket_locked(struct ttm_buffer_object *bo,
> - struct ww_acquire_ctx *ticket);
> +static inline void ttm_bo_unreserve(struct ttm_buffer_object *bo)
> +{
> + ttm_bo_unreserve_ticket(bo, NULL);
> +}
>
> /*
> * ttm_bo_util.c
> --
> 1.8.3.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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