From b0decaf75bd902a11c932005c88924947ac00b8c Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 4 Aug 2016 07:52:44 +0100 Subject: [PATCH] drm/i915: Track active vma requests Hook the vma itself into the i915_gem_request_retire() so that we can accurately track when a solitary vma is inactive (as opposed to having to wait for the entire object to be idle). This improves the interaction when using multiple contexts (with full-ppgtt) and eliminates some frequent list walking when retiring objects after a completed request. A side-effect is that we get an active vma reference for free. The consequence of this is shown in the next patch... v2: Update inline names to be consistent with i915_gem_object_get_active() Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-25-git-send-email-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_debugfs.c | 2 +- drivers/gpu/drm/i915/i915_gem.c | 50 ++++++++++++---------- drivers/gpu/drm/i915/i915_gem_execbuffer.c | 10 ++++- drivers/gpu/drm/i915/i915_gem_gtt.c | 20 +++++++++ drivers/gpu/drm/i915/i915_gem_gtt.h | 33 ++++++++++++++ 5 files changed, 91 insertions(+), 24 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index fe3c82339c8e..b35e6174fa7d 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -365,7 +365,7 @@ static int per_file_stats(int id, void *ptr, void *data) continue; } - if (obj->active) /* XXX per-vma statistic */ + if (i915_vma_is_active(vma)) stats->active += vma->node.size; else stats->inactive += vma->node.size; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index ce57c504aa25..51660ceae147 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -2347,7 +2347,6 @@ i915_gem_object_retire__read(struct i915_gem_active *active, int idx = request->engine->id; struct drm_i915_gem_object *obj = container_of(active, struct drm_i915_gem_object, last_read[idx]); - struct i915_vma *vma; GEM_BUG_ON((obj->active & (1 << idx)) == 0); @@ -2359,12 +2358,9 @@ i915_gem_object_retire__read(struct i915_gem_active *active, * so that we don't steal from recently used but inactive objects * (unless we are forced to ofc!) */ - list_move_tail(&obj->global_list, &request->i915->mm.bound_list); - - list_for_each_entry(vma, &obj->vma_list, obj_link) { - if (!list_empty(&vma->vm_link)) - list_move_tail(&vma->vm_link, &vma->vm->inactive_list); - } + if (obj->bind_count) + list_move_tail(&obj->global_list, + &request->i915->mm.bound_list); i915_gem_object_put(obj); } @@ -2797,8 +2793,29 @@ static void __i915_vma_iounmap(struct i915_vma *vma) static int __i915_vma_unbind(struct i915_vma *vma, bool wait) { struct drm_i915_gem_object *obj = vma->obj; + unsigned long active; int ret; + /* First wait upon any activity as retiring the request may + * have side-effects such as unpinning or even unbinding this vma. + */ + active = i915_vma_get_active(vma); + if (active && wait) { + int idx; + + for_each_active(active, idx) { + ret = i915_gem_active_retire(&vma->last_read[idx], + &vma->vm->dev->struct_mutex); + if (ret) + return ret; + } + + GEM_BUG_ON(i915_vma_is_active(vma)); + } + + if (vma->pin_count) + return -EBUSY; + if (list_empty(&vma->obj_link)) return 0; @@ -2807,18 +2824,9 @@ static int __i915_vma_unbind(struct i915_vma *vma, bool wait) return 0; } - if (vma->pin_count) - return -EBUSY; - GEM_BUG_ON(obj->bind_count == 0); GEM_BUG_ON(!obj->pages); - if (wait) { - ret = i915_gem_object_wait_rendering(obj, false); - if (ret) - return ret; - } - if (vma->is_ggtt && vma->ggtt_view.type == I915_GGTT_VIEW_NORMAL) { i915_gem_object_finish_gtt(obj); @@ -3201,9 +3209,6 @@ i915_gem_object_flush_cpu_write_domain(struct drm_i915_gem_object *obj) int i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write) { - struct drm_device *dev = obj->base.dev; - struct drm_i915_private *dev_priv = to_i915(dev); - struct i915_ggtt *ggtt = &dev_priv->ggtt; uint32_t old_write_domain, old_read_domains; struct i915_vma *vma; int ret; @@ -3256,9 +3261,10 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write) /* And bump the LRU for this access */ vma = i915_gem_obj_to_ggtt(obj); - if (vma && drm_mm_node_allocated(&vma->node) && !obj->active) - list_move_tail(&vma->vm_link, - &ggtt->base.inactive_list); + if (vma && + drm_mm_node_allocated(&vma->node) && + !i915_vma_is_active(vma)) + list_move_tail(&vma->vm_link, &vma->vm->inactive_list); return 0; } diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 8bf20f52b79f..5e3b5054f72d 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -1154,7 +1154,13 @@ void i915_vma_move_to_active(struct i915_vma *vma, obj->dirty = 1; /* be paranoid */ - /* Add a reference if we're newly entering the active list. */ + /* Add a reference if we're newly entering the active list. + * The order in which we add operations to the retirement queue is + * vital here: mark_active adds to the start of the callback list, + * such that subsequent callbacks are called first. Therefore we + * add the active reference first and queue for it to be dropped + * *last*. + */ if (obj->active == 0) i915_gem_object_get(obj); obj->active |= 1 << idx; @@ -1179,6 +1185,8 @@ void i915_vma_move_to_active(struct i915_vma *vma, } } + i915_vma_set_active(vma, idx); + i915_gem_active_set(&vma->last_read[idx], req); list_move_tail(&vma->vm_link, &vma->vm->active_list); } diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c index ad97892726ce..3e5d39dc7de0 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.c +++ b/drivers/gpu/drm/i915/i915_gem_gtt.c @@ -3327,12 +3327,30 @@ void i915_gem_restore_gtt_mappings(struct drm_device *dev) i915_ggtt_flush(dev_priv); } +static void +i915_vma_retire(struct i915_gem_active *active, + struct drm_i915_gem_request *rq) +{ + const unsigned int idx = rq->engine->id; + struct i915_vma *vma = + container_of(active, struct i915_vma, last_read[idx]); + + GEM_BUG_ON(!i915_vma_has_active_engine(vma, idx)); + + i915_vma_clear_active(vma, idx); + if (i915_vma_is_active(vma)) + return; + + list_move_tail(&vma->vm_link, &vma->vm->inactive_list); +} + static struct i915_vma * __i915_gem_vma_create(struct drm_i915_gem_object *obj, struct i915_address_space *vm, const struct i915_ggtt_view *ggtt_view) { struct i915_vma *vma; + int i; if (WARN_ON(i915_is_ggtt(vm) != !!ggtt_view)) return ERR_PTR(-EINVAL); @@ -3344,6 +3362,8 @@ __i915_gem_vma_create(struct drm_i915_gem_object *obj, INIT_LIST_HEAD(&vma->vm_link); INIT_LIST_HEAD(&vma->obj_link); INIT_LIST_HEAD(&vma->exec_list); + for (i = 0; i < ARRAY_SIZE(vma->last_read); i++) + init_request_active(&vma->last_read[i], i915_vma_retire); vma->vm = vm; vma->obj = obj; vma->is_ggtt = i915_is_ggtt(vm); diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.h b/drivers/gpu/drm/i915/i915_gem_gtt.h index cf8e3fc0692d..bfd3c112e33c 100644 --- a/drivers/gpu/drm/i915/i915_gem_gtt.h +++ b/drivers/gpu/drm/i915/i915_gem_gtt.h @@ -36,6 +36,8 @@ #include +#include "i915_gem_request.h" + struct drm_i915_file_private; typedef uint32_t gen6_pte_t; @@ -179,6 +181,9 @@ struct i915_vma { struct i915_address_space *vm; void __iomem *iomap; + unsigned int active; + struct i915_gem_active last_read[I915_NUM_ENGINES]; + /** Flags and address space this VMA is bound to */ #define GLOBAL_BIND (1<<0) #define LOCAL_BIND (1<<1) @@ -222,6 +227,34 @@ struct i915_vma { #define DRM_I915_GEM_OBJECT_MAX_PIN_COUNT 0xf }; +static inline unsigned int i915_vma_get_active(const struct i915_vma *vma) +{ + return vma->active; +} + +static inline bool i915_vma_is_active(const struct i915_vma *vma) +{ + return i915_vma_get_active(vma); +} + +static inline void i915_vma_set_active(struct i915_vma *vma, + unsigned int engine) +{ + vma->active |= BIT(engine); +} + +static inline void i915_vma_clear_active(struct i915_vma *vma, + unsigned int engine) +{ + vma->active &= ~BIT(engine); +} + +static inline bool i915_vma_has_active_engine(const struct i915_vma *vma, + unsigned int engine) +{ + return vma->active & BIT(engine); +} + struct i915_page_dma { struct page *page; union { -- 2.20.1