From 27c01aaef041f1fa3908c0330ff86d345523c3dc Mon Sep 17 00:00:00 2001 From: Chris Wilson Date: Thu, 4 Aug 2016 07:52:30 +0100 Subject: [PATCH] drm/i915: Prepare i915_gem_active for annotations In the future, we will want to add annotations to the i915_gem_active struct. The API is thus expanded to hide direct access to the contents of i915_gem_active and mediated instead through a number of helpers. Signed-off-by: Chris Wilson Reviewed-by: Joonas Lahtinen Link: http://patchwork.freedesktop.org/patch/msgid/1470293567-10811-11-git-send-email-chris@chris-wilson.co.uk --- drivers/gpu/drm/i915/i915_debugfs.c | 13 ++- drivers/gpu/drm/i915/i915_gem.c | 85 +++++++++------- drivers/gpu/drm/i915/i915_gem_fence.c | 11 +- drivers/gpu/drm/i915/i915_gem_request.h | 127 ++++++++++++++++++++++++ drivers/gpu/drm/i915/i915_gem_tiling.c | 2 +- drivers/gpu/drm/i915/i915_gem_userptr.c | 8 +- drivers/gpu/drm/i915/i915_gpu_error.c | 9 +- drivers/gpu/drm/i915/intel_display.c | 15 +-- 8 files changed, 204 insertions(+), 66 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 6151460f848f..24ff7f4bc412 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -155,10 +155,10 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj) obj->base.write_domain); for_each_engine_id(engine, dev_priv, id) seq_printf(m, "%x ", - i915_gem_request_get_seqno(obj->last_read[id].request)); + i915_gem_active_get_seqno(&obj->last_read[id])); seq_printf(m, "] %x %x%s%s%s", - i915_gem_request_get_seqno(obj->last_write.request), - i915_gem_request_get_seqno(obj->last_fence.request), + i915_gem_active_get_seqno(&obj->last_write), + i915_gem_active_get_seqno(&obj->last_fence), i915_cache_level_str(to_i915(obj->base.dev), obj->cache_level), obj->dirty ? " dirty" : "", obj->madv == I915_MADV_DONTNEED ? " purgeable" : ""); @@ -195,8 +195,11 @@ describe_obj(struct seq_file *m, struct drm_i915_gem_object *obj) *t = '\0'; seq_printf(m, " (%s mappable)", s); } - if (obj->last_write.request) - seq_printf(m, " (%s)", obj->last_write.request->engine->name); + + engine = i915_gem_active_get_engine(&obj->last_write); + if (engine) + seq_printf(m, " (%s)", engine->name); + if (obj->frontbuffer_bits) seq_printf(m, " (frontbuffer: 0x%03x)", obj->frontbuffer_bits); } diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index 1478efda2f76..0c158c79f640 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1349,27 +1349,30 @@ int i915_gem_object_wait_rendering(struct drm_i915_gem_object *obj, bool readonly) { + struct drm_i915_gem_request *request; struct reservation_object *resv; int ret, i; if (readonly) { - if (obj->last_write.request) { - ret = i915_wait_request(obj->last_write.request); + request = i915_gem_active_peek(&obj->last_write); + if (request) { + ret = i915_wait_request(request); if (ret) return ret; - i = obj->last_write.request->engine->id; - if (obj->last_read[i].request == obj->last_write.request) + i = request->engine->id; + if (i915_gem_active_peek(&obj->last_read[i]) == request) i915_gem_object_retire__read(obj, i); else i915_gem_object_retire__write(obj); } } else { for (i = 0; i < I915_NUM_ENGINES; i++) { - if (!obj->last_read[i].request) + request = i915_gem_active_peek(&obj->last_read[i]); + if (!request) continue; - ret = i915_wait_request(obj->last_read[i].request); + ret = i915_wait_request(request); if (ret) return ret; @@ -1397,9 +1400,9 @@ i915_gem_object_retire_request(struct drm_i915_gem_object *obj, { int idx = req->engine->id; - if (obj->last_read[idx].request == req) + if (i915_gem_active_peek(&obj->last_read[idx]) == req) i915_gem_object_retire__read(obj, idx); - else if (obj->last_write.request == req) + else if (i915_gem_active_peek(&obj->last_write) == req) i915_gem_object_retire__write(obj); if (!i915_reset_in_progress(&req->i915->gpu_error)) @@ -1428,20 +1431,20 @@ i915_gem_object_wait_rendering__nonblocking(struct drm_i915_gem_object *obj, if (readonly) { struct drm_i915_gem_request *req; - req = obj->last_write.request; + req = i915_gem_active_get(&obj->last_write); if (req == NULL) return 0; - requests[n++] = i915_gem_request_get(req); + requests[n++] = req; } else { for (i = 0; i < I915_NUM_ENGINES; i++) { struct drm_i915_gem_request *req; - req = obj->last_read[i].request; + req = i915_gem_active_get(&obj->last_read[i]); if (req == NULL) continue; - requests[n++] = i915_gem_request_get(req); + requests[n++] = req; } } @@ -2383,8 +2386,8 @@ void i915_vma_move_to_active(struct i915_vma *vma, static void i915_gem_object_retire__write(struct drm_i915_gem_object *obj) { - GEM_BUG_ON(!obj->last_write.request); - GEM_BUG_ON(!(obj->active & intel_engine_flag(obj->last_write.request->engine))); + GEM_BUG_ON(!i915_gem_active_isset(&obj->last_write)); + GEM_BUG_ON(!(obj->active & intel_engine_flag(i915_gem_active_get_engine(&obj->last_write)))); i915_gem_active_set(&obj->last_write, NULL); intel_fb_obj_flush(obj, true, ORIGIN_CS); @@ -2393,15 +2396,17 @@ i915_gem_object_retire__write(struct drm_i915_gem_object *obj) static void i915_gem_object_retire__read(struct drm_i915_gem_object *obj, int idx) { + struct intel_engine_cs *engine; struct i915_vma *vma; - GEM_BUG_ON(!obj->last_read[idx].request); + GEM_BUG_ON(!i915_gem_active_isset(&obj->last_read[idx])); GEM_BUG_ON(!(obj->active & (1 << idx))); list_del_init(&obj->engine_list[idx]); i915_gem_active_set(&obj->last_read[idx], NULL); - if (obj->last_write.request && obj->last_write.request->engine->id == idx) + engine = i915_gem_active_get_engine(&obj->last_write); + if (engine && engine->id == idx) i915_gem_object_retire__write(obj); obj->active &= ~(1 << idx); @@ -2621,7 +2626,7 @@ i915_gem_retire_requests_ring(struct intel_engine_cs *engine) struct drm_i915_gem_object, engine_list[engine->id]); - if (!list_empty(&obj->last_read[engine->id].request->list)) + if (!list_empty(&i915_gem_active_peek(&obj->last_read[engine->id])->list)) break; i915_gem_object_retire__read(obj, engine->id); @@ -2754,7 +2759,7 @@ i915_gem_object_flush_active(struct drm_i915_gem_object *obj) for (i = 0; i < I915_NUM_ENGINES; i++) { struct drm_i915_gem_request *req; - req = obj->last_read[i].request; + req = i915_gem_active_peek(&obj->last_read[i]); if (req == NULL) continue; @@ -2794,7 +2799,7 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file) { struct drm_i915_gem_wait *args = data; struct drm_i915_gem_object *obj; - struct drm_i915_gem_request *req[I915_NUM_ENGINES]; + struct drm_i915_gem_request *requests[I915_NUM_ENGINES]; int i, n = 0; int ret; @@ -2830,20 +2835,21 @@ i915_gem_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file) i915_gem_object_put(obj); for (i = 0; i < I915_NUM_ENGINES; i++) { - if (!obj->last_read[i].request) - continue; + struct drm_i915_gem_request *req; - req[n++] = i915_gem_request_get(obj->last_read[i].request); + req = i915_gem_active_get(&obj->last_read[i]); + if (req) + requests[n++] = req; } mutex_unlock(&dev->struct_mutex); for (i = 0; i < n; i++) { if (ret == 0) - ret = __i915_wait_request(req[i], true, + ret = __i915_wait_request(requests[i], true, args->timeout_ns > 0 ? &args->timeout_ns : NULL, to_rps_client(file)); - i915_gem_request_put(req[i]); + i915_gem_request_put(requests[i]); } return ret; @@ -2916,7 +2922,7 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj, struct drm_i915_gem_request *to) { const bool readonly = obj->base.pending_write_domain == 0; - struct drm_i915_gem_request *req[I915_NUM_ENGINES]; + struct drm_i915_gem_request *requests[I915_NUM_ENGINES]; int ret, i, n; if (!obj->active) @@ -2924,15 +2930,22 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj, n = 0; if (readonly) { - if (obj->last_write.request) - req[n++] = obj->last_write.request; + struct drm_i915_gem_request *req; + + req = i915_gem_active_peek(&obj->last_write); + if (req) + requests[n++] = req; } else { - for (i = 0; i < I915_NUM_ENGINES; i++) - if (obj->last_read[i].request) - req[n++] = obj->last_read[i].request; + for (i = 0; i < I915_NUM_ENGINES; i++) { + struct drm_i915_gem_request *req; + + req = i915_gem_active_peek(&obj->last_read[i]); + if (req) + requests[n++] = req; + } } for (i = 0; i < n; i++) { - ret = __i915_gem_object_sync(obj, to, req[i]); + ret = __i915_gem_object_sync(obj, to, requests[i]); if (ret) return ret; } @@ -4021,17 +4034,17 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data, args->busy = 0; if (obj->active) { + struct drm_i915_gem_request *req; int i; for (i = 0; i < I915_NUM_ENGINES; i++) { - struct drm_i915_gem_request *req; - - req = obj->last_read[i].request; + req = i915_gem_active_peek(&obj->last_read[i]); if (req) args->busy |= 1 << (16 + req->engine->exec_id); } - if (obj->last_write.request) - args->busy |= obj->last_write.request->engine->exec_id; + req = i915_gem_active_peek(&obj->last_write); + if (req) + args->busy |= req->engine->exec_id; } unref: diff --git a/drivers/gpu/drm/i915/i915_gem_fence.c b/drivers/gpu/drm/i915/i915_gem_fence.c index d16b385e79e9..9fdbd66128a6 100644 --- a/drivers/gpu/drm/i915/i915_gem_fence.c +++ b/drivers/gpu/drm/i915/i915_gem_fence.c @@ -261,14 +261,13 @@ static inline void i915_gem_object_fence_lost(struct drm_i915_gem_object *obj) static int i915_gem_object_wait_fence(struct drm_i915_gem_object *obj) { - if (obj->last_fence.request) { - int ret = i915_wait_request(obj->last_fence.request); - if (ret) - return ret; + int ret; - i915_gem_active_set(&obj->last_fence, NULL); - } + ret = i915_gem_active_wait(&obj->last_fence); + if (ret) + return ret; + i915_gem_active_set(&obj->last_fence, NULL); return 0; } diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h index cf2df33f9892..e13834e2e3e0 100644 --- a/drivers/gpu/drm/i915/i915_gem_request.h +++ b/drivers/gpu/drm/i915/i915_gem_request.h @@ -280,6 +280,15 @@ struct i915_gem_active { struct drm_i915_gem_request *request; }; +/** + * i915_gem_active_set - updates the tracker to watch the current request + * @active - the active tracker + * @request - the request to watch + * + * i915_gem_active_set() watches the given @request for completion. Whilst + * that @request is busy, the @active reports busy. When that @request is + * retired, the @active tracker is updated to report idle. + */ static inline void i915_gem_active_set(struct i915_gem_active *active, struct drm_i915_gem_request *request) @@ -287,6 +296,124 @@ i915_gem_active_set(struct i915_gem_active *active, i915_gem_request_assign(&active->request, request); } +/** + * i915_gem_active_peek - report the request being monitored + * @active - the active tracker + * + * i915_gem_active_peek() returns the current request being tracked, or NULL. + * It does not obtain a reference on the request for the caller, so the + * caller must hold struct_mutex. + */ +static inline struct drm_i915_gem_request * +i915_gem_active_peek(const struct i915_gem_active *active) +{ + return active->request; +} + +/** + * i915_gem_active_get - return a reference to the active request + * @active - the active tracker + * + * i915_gem_active_get() returns a reference to the active request, or NULL + * if the active tracker is idle. The caller must hold struct_mutex. + */ +static inline struct drm_i915_gem_request * +i915_gem_active_get(const struct i915_gem_active *active) +{ + struct drm_i915_gem_request *request; + + request = i915_gem_active_peek(active); + if (!request || i915_gem_request_completed(request)) + return NULL; + + return i915_gem_request_get(request); +} + +/** + * i915_gem_active_isset - report whether the active tracker is assigned + * @active - the active tracker + * + * i915_gem_active_isset() returns true if the active tracker is currently + * assigned to a request. Due to the lazy retiring, that request may be idle + * and this may report stale information. + */ +static inline bool +i915_gem_active_isset(const struct i915_gem_active *active) +{ + return active->request; +} + +/** + * i915_gem_active_is_idle - report whether the active tracker is idle + * @active - the active tracker + * + * i915_gem_active_is_idle() returns true if the active tracker is currently + * unassigned or if the request is complete (but not yet retired). Requires + * the caller to hold struct_mutex (but that can be relaxed if desired). + */ +static inline bool +i915_gem_active_is_idle(const struct i915_gem_active *active) +{ + struct drm_i915_gem_request *request; + + request = i915_gem_active_peek(active); + if (!request || i915_gem_request_completed(request)) + return true; + + return false; +} + +/** + * i915_gem_active_wait - waits until the request is completed + * @active - the active request on which to wait + * + * i915_gem_active_wait() waits until the request is completed before + * returning. Note that it does not guarantee that the request is + * retired first, see i915_gem_active_retire(). + */ +static inline int __must_check +i915_gem_active_wait(const struct i915_gem_active *active) +{ + struct drm_i915_gem_request *request; + + request = i915_gem_active_peek(active); + if (!request) + return 0; + + return i915_wait_request(request); +} + +/** + * i915_gem_active_retire - waits until the request is retired + * @active - the active request on which to wait + * + * i915_gem_active_retire() waits until the request is completed, + * and then ensures that at least the retirement handler for this + * @active tracker is called before returning. If the @active + * tracker is idle, the function returns immediately. + */ +static inline int __must_check +i915_gem_active_retire(const struct i915_gem_active *active) +{ + return i915_gem_active_wait(active); +} + +/* Convenience functions for peeking at state inside active's request whilst + * guarded by the struct_mutex. + */ + +static inline uint32_t +i915_gem_active_get_seqno(const struct i915_gem_active *active) +{ + return i915_gem_request_get_seqno(i915_gem_active_peek(active)); +} + +static inline struct intel_engine_cs * +i915_gem_active_get_engine(const struct i915_gem_active *active) +{ + return i915_gem_request_get_engine(i915_gem_active_peek(active)); +} + #define for_each_active(mask, idx) \ for (; mask ? idx = ffs(mask) - 1, 1 : 0; mask &= ~BIT(idx)) diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c index 00d796da65fb..8cef2d6b291a 100644 --- a/drivers/gpu/drm/i915/i915_gem_tiling.c +++ b/drivers/gpu/drm/i915/i915_gem_tiling.c @@ -242,7 +242,7 @@ i915_gem_set_tiling(struct drm_device *dev, void *data, } obj->fence_dirty = - obj->last_fence.request || + !i915_gem_active_is_idle(&obj->last_fence) || obj->fence_reg != I915_FENCE_REG_NONE; obj->tiling_mode = args->tiling_mode; diff --git a/drivers/gpu/drm/i915/i915_gem_userptr.c b/drivers/gpu/drm/i915/i915_gem_userptr.c index 32f50a70ea42..00ab5e9d2eb7 100644 --- a/drivers/gpu/drm/i915/i915_gem_userptr.c +++ b/drivers/gpu/drm/i915/i915_gem_userptr.c @@ -74,11 +74,9 @@ static void wait_rendering(struct drm_i915_gem_object *obj) for (i = 0; i < I915_NUM_ENGINES; i++) { struct drm_i915_gem_request *req; - req = obj->last_read[i].request; - if (req == NULL) - continue; - - requests[n++] = i915_gem_request_get(req); + req = i915_gem_active_get(&obj->last_read[i]); + if (req) + requests[n++] = req; } mutex_unlock(&dev->struct_mutex); diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c index d6482e980d5e..585fe2bdadd5 100644 --- a/drivers/gpu/drm/i915/i915_gpu_error.c +++ b/drivers/gpu/drm/i915/i915_gpu_error.c @@ -746,13 +746,14 @@ static void capture_bo(struct drm_i915_error_buffer *err, struct i915_vma *vma) { struct drm_i915_gem_object *obj = vma->obj; + struct intel_engine_cs *engine; int i; err->size = obj->base.size; err->name = obj->base.name; for (i = 0; i < I915_NUM_ENGINES; i++) - err->rseqno[i] = i915_gem_request_get_seqno(obj->last_read[i].request); - err->wseqno = i915_gem_request_get_seqno(obj->last_write.request); + err->rseqno[i] = i915_gem_active_get_seqno(&obj->last_read[i]); + err->wseqno = i915_gem_active_get_seqno(&obj->last_write); err->gtt_offset = vma->node.start; err->read_domains = obj->base.read_domains; err->write_domain = obj->base.write_domain; @@ -764,8 +765,10 @@ static void capture_bo(struct drm_i915_error_buffer *err, err->dirty = obj->dirty; err->purgeable = obj->madv != I915_MADV_WILLNEED; err->userptr = obj->userptr.mm != NULL; - err->engine = obj->last_write.request ? obj->last_write.request->engine->id : -1; err->cache_level = obj->cache_level; + + engine = i915_gem_active_get_engine(&obj->last_write); + err->engine = engine ? engine->id : -1; } static u32 capture_active_bo(struct drm_i915_error_buffer *err, diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index e858fede37ce..8c03d13d494d 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -11370,7 +11370,7 @@ static bool use_mmio_flip(struct intel_engine_cs *engine, if (resv && !reservation_object_test_signaled_rcu(resv, false)) return true; - return engine != i915_gem_request_get_engine(obj->last_write.request); + return engine != i915_gem_active_get_engine(&obj->last_write); } static void skl_do_mmio_flip(struct intel_crtc *intel_crtc, @@ -11673,7 +11673,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc, } else if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev)) { engine = &dev_priv->engine[BCS]; } else if (INTEL_INFO(dev)->gen >= 7) { - engine = i915_gem_request_get_engine(obj->last_write.request); + engine = i915_gem_active_get_engine(&obj->last_write); if (engine == NULL || engine->id != RCS) engine = &dev_priv->engine[BCS]; } else { @@ -11694,9 +11694,7 @@ static int intel_crtc_page_flip(struct drm_crtc *crtc, if (mmio_flip) { INIT_WORK(&work->mmio_work, intel_mmio_flip_work_func); - i915_gem_request_assign(&work->flip_queued_req, - obj->last_write.request); - + work->flip_queued_req = i915_gem_active_get(&obj->last_write); schedule_work(&work->mmio_work); } else { request = i915_gem_request_alloc(engine, engine->last_context); @@ -14039,11 +14037,8 @@ intel_prepare_plane_fb(struct drm_plane *plane, } if (ret == 0) { - struct intel_plane_state *plane_state = - to_intel_plane_state(new_state); - - i915_gem_request_assign(&plane_state->wait_req, - obj->last_write.request); + to_intel_plane_state(new_state)->wait_req = + i915_gem_active_get(&obj->last_write); } return ret; -- 2.20.1