[20/23] drm/i915: Move i915_vma_lock in the selftests to avoid lock inversion, v2.

Message ID	20200520130030.1014994-20-maarten.lankhorst@linux.intel.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <SRS0=wl42=7C=lists.freedesktop.org=intel-gfx-bounces@kernel.org> DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2CE41207D4 From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> To: intel-gfx@lists.freedesktop.org Date: Wed, 20 May 2020 15:00:27 +0200 Message-Id: <20200520130030.1014994-20-maarten.lankhorst@linux.intel.com> In-Reply-To: <20200520130030.1014994-1-maarten.lankhorst@linux.intel.com> References: <20200520130030.1014994-1-maarten.lankhorst@linux.intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 20/23] drm/i915: Move i915_vma_lock in the selftests to avoid lock inversion, v2. Precedence: list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" <intel-gfx-bounces@lists.freedesktop.org>
Series	[01/23] Revert "drm/i915/gem: Drop relocation slowpath". \| expand [01/23] Revert "drm/i915/gem: Drop relocation slowpath". [02/23] drm/i915: Add an implementation for i915_gem_ww_ctx locking, v2. [03/23] drm/i915: Remove locking from i915_gem_object_prepare_read/write [04/23] drm/i915: Parse command buffer earlier in eb_relocate(slow) [05/23] Revert "drm/i915/gem: Split eb_vma into its own allocation" [06/23] drm/i915/gem: Make eb_add_lut interruptible wait on object lock. [07/23] drm/i915: Use per object locking in execbuf, v10. [08/23] drm/i915: Use ww locking in intel_renderstate. [09/23] drm/i915: Add ww context handling to context_barrier_task [10/23] drm/i915: Nuke arguments to eb_pin_engine [11/23] drm/i915: Pin engine before pinning all objects, v4. [12/23] drm/i915: Rework intel_context pinning to do everything outside of pin_mutex [13/23] drm/i915: Make sure execbuffer always passes ww state to i915_vma_pin. [14/23] drm/i915: Convert i915_gem_object/client_blt.c to use ww locking as well, v2. [15/23] drm/i915: Kill last user of intel_context_create_request outside of selftests [16/23] drm/i915: Convert i915_perf to ww locking as well [17/23] drm/i915: Dirty hack to fix selftests locking inversion [18/23] drm/i915/selftests: Fix locking inversion in lrc selftest. [19/23] drm/i915: Use ww pinning for intel_context_create_request() [20/23] drm/i915: Move i915_vma_lock in the selftests to avoid lock inversion, v2. [21/23] drm/i915: Add ww locking to vm_fault_gtt [22/23] drm/i915: Add ww locking to pin_to_display_plane [23/23] drm/i915: Ensure we hold the pin mutex

diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c index dcdfc396f2f8..7049a6bbc03d 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_coherency.c @@ -201,25 +201,25 @@ static int gpu_set(struct context *ctx, unsigned long offset, u32 v) i915_gem_object_lock(ctx->obj, NULL); err = i915_gem_object_set_to_gtt_domain(ctx->obj, true); - i915_gem_object_unlock(ctx->obj); if (err) - return err; + goto out_unlock; vma = i915_gem_object_ggtt_pin(ctx->obj, NULL, 0, 0, 0); - if (IS_ERR(vma)) - return PTR_ERR(vma); + if (IS_ERR(vma)) { + err = PTR_ERR(vma); + goto out_unlock; + } rq = intel_engine_create_kernel_request(ctx->engine); if (IS_ERR(rq)) { - i915_vma_unpin(vma); - return PTR_ERR(rq); + err = PTR_ERR(rq); + goto out_unpin; } cs = intel_ring_begin(rq, 4); if (IS_ERR(cs)) { - i915_request_add(rq); - i915_vma_unpin(vma); - return PTR_ERR(cs); + err = PTR_ERR(cs); + goto out_rq; } if (INTEL_GEN(ctx->engine->i915) >= 8) { @@ -240,14 +240,16 @@ static int gpu_set(struct context *ctx, unsigned long offset, u32 v) } intel_ring_advance(rq, cs); - i915_vma_lock(vma); err = i915_request_await_object(rq, vma->obj, true); if (err == 0) err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE); - i915_vma_unlock(vma); - i915_vma_unpin(vma); +out_rq: i915_request_add(rq); +out_unpin: + i915_vma_unpin(vma); +out_unlock: + i915_gem_object_unlock(ctx->obj); return err; } diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c index 5ecf0afc3e71..fcb1368c011a 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c @@ -124,6 +124,8 @@ static int igt_gpu_reloc(void *arg) goto err_scratch; } + intel_gt_pm_get(&eb.i915->gt); + for_each_uabi_engine(eb.engine, eb.i915) { reloc_cache_init(&eb.reloc_cache, eb.i915); memset(map, POISON_INUSE, 4096); @@ -134,15 +136,26 @@ static int igt_gpu_reloc(void *arg) err = PTR_ERR(eb.context); goto err_pm; } + eb.reloc_pool = NULL; - err = intel_context_pin(eb.context); - if (err) - goto err_put; + i915_gem_ww_ctx_init(&eb.ww, false); +retry: + err = intel_context_pin_ww(eb.context, &eb.ww); + if (!err) { + err = __igt_gpu_reloc(&eb, scratch); + + intel_context_unpin(eb.context); + } + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&eb.ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&eb.ww); - err = __igt_gpu_reloc(&eb, scratch); + if (eb.reloc_pool) + intel_gt_buffer_pool_put(eb.reloc_pool); - intel_context_unpin(eb.context); -err_put: intel_context_put(eb.context); err_pm: intel_engine_pm_put(eb.engine); @@ -153,6 +166,7 @@ static int igt_gpu_reloc(void *arg) if (igt_flush_test(eb.i915)) err = -EIO; + intel_gt_pm_put(&eb.i915->gt); err_scratch: i915_gem_object_put(scratch); return err; diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c index 9fb95a45bcad..d27d87a678c8 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c @@ -528,31 +528,42 @@ static int make_obj_busy(struct drm_i915_gem_object *obj) for_each_uabi_engine(engine, i915) { struct i915_request *rq; struct i915_vma *vma; + struct i915_gem_ww_ctx ww; int err; vma = i915_vma_instance(obj, &engine->gt->ggtt->vm, NULL); if (IS_ERR(vma)) return PTR_ERR(vma); - err = i915_vma_pin(vma, 0, 0, PIN_USER); + i915_gem_ww_ctx_init(&ww, false); +retry: + err = i915_gem_object_lock(obj, &ww); + if (!err) + err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_USER); if (err) - return err; + goto err; rq = intel_engine_create_kernel_request(engine); if (IS_ERR(rq)) { - i915_vma_unpin(vma); - return PTR_ERR(rq); + err = PTR_ERR(rq); + goto err_unpin; } - i915_vma_lock(vma); err = i915_request_await_object(rq, vma->obj, true); if (err == 0) err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE); - i915_vma_unlock(vma); i915_request_add(rq); +err_unpin: i915_vma_unpin(vma); +err: + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); if (err) return err; } @@ -1123,6 +1134,7 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915, for_each_uabi_engine(engine, i915) { struct i915_request *rq; struct i915_vma *vma; + struct i915_gem_ww_ctx ww; vma = i915_vma_instance(obj, engine->kernel_context->vm, NULL); if (IS_ERR(vma)) { @@ -1130,9 +1142,13 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915, goto out_unmap; } - err = i915_vma_pin(vma, 0, 0, PIN_USER); + i915_gem_ww_ctx_init(&ww, false); +retry: + err = i915_gem_object_lock(obj, &ww); + if (!err) + err = i915_vma_pin_ww(vma, &ww, 0, 0, PIN_USER); if (err) - goto out_unmap; + goto out_ww; rq = i915_request_create(engine->kernel_context); if (IS_ERR(rq)) { @@ -1140,11 +1156,9 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915, goto out_unpin; } - i915_vma_lock(vma); err = i915_request_await_object(rq, vma->obj, false); if (err == 0) err = i915_vma_move_to_active(vma, rq, 0); - i915_vma_unlock(vma); err = engine->emit_bb_start(rq, vma->node.start, 0, 0); i915_request_get(rq); @@ -1166,6 +1180,13 @@ static int __igt_mmap_gpu(struct drm_i915_private *i915, out_unpin: i915_vma_unpin(vma); +out_ww: + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); if (err) goto out_unmap; } diff --git a/drivers/gpu/drm/i915/gt/selftest_rps.c b/drivers/gpu/drm/i915/gt/selftest_rps.c index 5049c3dd08a6..f2071019599f 100644 --- a/drivers/gpu/drm/i915/gt/selftest_rps.c +++ b/drivers/gpu/drm/i915/gt/selftest_rps.c @@ -92,20 +92,20 @@ create_spin_counter(struct intel_engine_cs *engine, vma = i915_vma_instance(obj, vm, NULL); if (IS_ERR(vma)) { - i915_gem_object_put(obj); - return vma; + err = PTR_ERR(vma); + goto err_put; } err = i915_vma_pin(vma, 0, 0, PIN_USER); - if (err) { - i915_vma_put(vma); - return ERR_PTR(err); - } + if (err) + goto err_unlock; + + i915_vma_lock(vma); base = i915_gem_object_pin_map(obj, I915_MAP_WC); if (IS_ERR(base)) { - i915_gem_object_put(obj); - return ERR_CAST(base); + err = PTR_ERR(base); + goto err_unpin; } cs = base; @@ -149,6 +149,14 @@ create_spin_counter(struct intel_engine_cs *engine, *cancel = base + loop; *counter = srm ? memset32(base + end, 0, 1) : NULL; return vma; + +err_unpin: + i915_vma_unpin(vma); +err_unlock: + i915_vma_unlock(vma); +err_put: + i915_gem_object_put(obj); + return ERR_PTR(err); } static u8 wait_for_freq(struct intel_rps *rps, u8 freq, int timeout_ms) @@ -654,7 +662,6 @@ int live_rps_frequency_cs(void *arg) goto err_vma; } - i915_vma_lock(vma); err = i915_request_await_object(rq, vma->obj, false); if (!err) err = i915_vma_move_to_active(vma, rq, 0); @@ -662,7 +669,6 @@ int live_rps_frequency_cs(void *arg) err = rq->engine->emit_bb_start(rq, vma->node.start, PAGE_SIZE, 0); - i915_vma_unlock(vma); i915_request_add(rq); if (err) goto err_vma; @@ -723,6 +729,7 @@ int live_rps_frequency_cs(void *arg) i915_gem_object_flush_map(vma->obj); i915_gem_object_unpin_map(vma->obj); i915_vma_unpin(vma); + i915_vma_unlock(vma); i915_vma_put(vma); engine_heartbeat_enable(engine); @@ -796,7 +803,6 @@ int live_rps_frequency_srm(void *arg) goto err_vma; } - i915_vma_lock(vma); err = i915_request_await_object(rq, vma->obj, false); if (!err) err = i915_vma_move_to_active(vma, rq, 0); @@ -804,7 +810,6 @@ int live_rps_frequency_srm(void *arg) err = rq->engine->emit_bb_start(rq, vma->node.start, PAGE_SIZE, 0); - i915_vma_unlock(vma); i915_request_add(rq); if (err) goto err_vma; @@ -864,6 +869,7 @@ int live_rps_frequency_srm(void *arg) i915_gem_object_flush_map(vma->obj); i915_gem_object_unpin_map(vma->obj); i915_vma_unpin(vma); + i915_vma_unlock(vma); i915_vma_put(vma); engine_heartbeat_enable(engine); diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c b/drivers/gpu/drm/i915/selftests/i915_request.c index 92c628f18c60..8d3b854a83c6 100644 --- a/drivers/gpu/drm/i915/selftests/i915_request.c +++ b/drivers/gpu/drm/i915/selftests/i915_request.c @@ -861,6 +861,8 @@ static int live_all_engines(void *arg) goto out_free; } + i915_vma_lock(batch); + idx = 0; for_each_uabi_engine(engine, i915) { request[idx] = intel_engine_create_kernel_request(engine); @@ -871,11 +873,9 @@ static int live_all_engines(void *arg) goto out_request; } - i915_vma_lock(batch); err = i915_request_await_object(request[idx], batch->obj, 0); if (err == 0) err = i915_vma_move_to_active(batch, request[idx], 0); - i915_vma_unlock(batch); GEM_BUG_ON(err); err = engine->emit_bb_start(request[idx], @@ -890,6 +890,8 @@ static int live_all_engines(void *arg) idx++; } + i915_vma_unlock(batch); + idx = 0; for_each_uabi_engine(engine, i915) { if (i915_request_completed(request[idx])) { @@ -980,12 +982,13 @@ static int live_sequential_engines(void *arg) goto out_free; } + i915_vma_lock(batch); request[idx] = intel_engine_create_kernel_request(engine); if (IS_ERR(request[idx])) { err = PTR_ERR(request[idx]); pr_err("%s: Request allocation failed for %s with err=%d\n", __func__, engine->name, err); - goto out_request; + goto out_unlock; } if (prev) { @@ -995,16 +998,14 @@ static int live_sequential_engines(void *arg) i915_request_add(request[idx]); pr_err("%s: Request await failed for %s with err=%d\n", __func__, engine->name, err); - goto out_request; + goto out_unlock; } } - i915_vma_lock(batch); err = i915_request_await_object(request[idx], batch->obj, false); if (err == 0) err = i915_vma_move_to_active(batch, request[idx], 0); - i915_vma_unlock(batch); GEM_BUG_ON(err); err = engine->emit_bb_start(request[idx], @@ -1019,6 +1020,11 @@ static int live_sequential_engines(void *arg) prev = request[idx]; idx++; + +out_unlock: + i915_vma_unlock(batch); + if (err) + goto out_request; } idx = 0;

[20/23] drm/i915: Move i915_vma_lock in the selftests to avoid lock inversion, v2.

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