From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3098FC07E9C for ; Sun, 11 Jul 2021 03:53:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06191611AC for ; Sun, 11 Jul 2021 03:53:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231386AbhGKD4a (ORCPT ); Sat, 10 Jul 2021 23:56:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45088 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231140AbhGKD4a (ORCPT ); Sat, 10 Jul 2021 23:56:30 -0400 Received: from mail-ot1-x32e.google.com (mail-ot1-x32e.google.com [IPv6:2607:f8b0:4864:20::32e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 30429C0613DD for ; Sat, 10 Jul 2021 20:53:44 -0700 (PDT) Received: by mail-ot1-x32e.google.com with SMTP id 75-20020a9d08510000b02904acfe6bcccaso14409535oty.12 for ; Sat, 10 Jul 2021 20:53:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jlekstrand-net.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=pgm8tWnP9Qw+fFMlHWQM7xvSAA4M6kZ/Omvo2MoNcBo=; b=nHx7D/AMpb6PbuS5bMlebkit9ECISW0iACwYY3lwujADdX6b9YG26YALwagVGUxC8J wyiuABAl4IddVFMy9A3Y2aDuhx510eegyzMoPSgL21PKOS+hHRBAWIc0JfnOWhEfQVb8 CE2/qcsAhGkW2Y6sk5PogCB/ugggHf2fPuS5yw49PLoPxLHBABaz50/Y0LDseZYLx8/h hPzrnz6NZrjs9A6z8p2s/hmROH3DjlIEbMzHrqAnqmNtD3lwa9TrOS6u3jGOh6oqw7a4 oCEWVXdrPIK6KeYhVefA3p3Bq1/DVL1cArnCs6Dc3AXTYxhEuILGPcgfT6fauck5gX1L du9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=pgm8tWnP9Qw+fFMlHWQM7xvSAA4M6kZ/Omvo2MoNcBo=; b=ldUME9Nh3o+REGXipBllhGbNdLXDcaK00b13BkLx5kFCWBQQEp5I+XGNrgY2KBCXs8 wHV6eFOjhJkvRlQxNs3yMV0aV73C/3BkvvfV/tdrednaJdpi5/shvhPK4qcpdS0ZtXaO 1cU8+oP8jGIQwI26u4PNRRiFt/OkzrstY2UT6iDN+SIRD9UacSi5XG4t7EdbOQjf1ceX x2/LQ+6/2Gk8OGaRmKDSRpqV/7y9CEo1aI5IRsoyWE7yTjkBrxeV8xfVGtXAU1RUJy/H EdTPZyNS+Qnc/qUleimOOAjfoRJEAtV1O6+yGxKBq01spqzoexZEZcRHq8XSYFgGWEBT mXYQ== X-Gm-Message-State: AOAM5339gXyzMPb8/EDZLEm9Q41JZ2VDDEvo4ieY/y6Sxw/QgT9NJklO nlxBLKzkmObmvunEgmUuDE+Iqg== X-Google-Smtp-Source: ABdhPJw6Ngcc4jOYsN6CI4EPSd7bWPxQdI2aODVacDAXAn0AGHZwsCm5Ukft81kSbCdcfw6eNz/KBQ== X-Received: by 2002:a9d:651a:: with SMTP id i26mr5388184otl.148.1625975622706; Sat, 10 Jul 2021 20:53:42 -0700 (PDT) Received: from omlet.lan ([68.203.99.148]) by smtp.gmail.com with ESMTPSA id a11sm2310188otr.48.2021.07.10.20.53.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jul 2021 20:53:42 -0700 (PDT) From: Jason Ekstrand To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: Jason Ekstrand , stable@vger.kernel.org, Maarten Lankhorst , Jon Bloomfield , Daniel Vetter Subject: [PATCH 1/5] drm/i915: Revert "drm/i915/gem: Asynchronous cmdparser" Date: Sat, 10 Jul 2021 22:53:32 -0500 Message-Id: <20210711035336.803025-2-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210711035336.803025-1-jason@jlekstrand.net> References: <20210711035336.803025-1-jason@jlekstrand.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This reverts 686c7c35abc2 ("drm/i915/gem: Asynchronous cmdparser"). The justification for this commit in the git history was a vague comment about getting it out from under the struct_mutex. While this may improve perf for some workloads on Gen7 platforms where we rely on the command parser for features such as indirect rendering, no numbers were provided to prove such an improvement. It claims to closed two gitlab/bugzilla issues but with no explanation whatsoever as to why or what bug it's fixing. Meanwhile, by moving command parsing off to an async callback, it leaves us with a problem of what to do on error. When things were synchronous, EXECBUFFER2 would fail with an error code if parsing failed. When moving it to async, we needed another way to handle that error and the solution employed was to set an error on the dma_fence and then trust that said error gets propagated to the client eventually. Moving back to synchronous will help us untangle the fence error propagation mess. This also reverts most of 0edbb9ba1bfe ("drm/i915: Move cmd parser pinning to execbuffer") which is a refactor of some of our allocation paths for asynchronous parsing. Now that everything is synchronous, we don't need it. v2 (Daniel Vetter): - Add stabel Cc and Fixes tag Signed-off-by: Jason Ekstrand Cc: # v5.6+ Fixes: 9e31c1fe45d5 ("drm/i915: Propagate errors on awaiting already signaled fences") Cc: Maarten Lankhorst Reviewed-by: Jon Bloomfield Acked-by: Daniel Vetter --- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 227 +----------------- .../i915/gem/selftests/i915_gem_execbuffer.c | 4 + drivers/gpu/drm/i915/i915_cmd_parser.c | 132 +++++----- drivers/gpu/drm/i915/i915_drv.h | 7 +- 4 files changed, 91 insertions(+), 279 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 5ea8b4e23e428..1ed7475de454d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -25,10 +25,8 @@ #include "i915_gem_clflush.h" #include "i915_gem_context.h" #include "i915_gem_ioctls.h" -#include "i915_sw_fence_work.h" #include "i915_trace.h" #include "i915_user_extensions.h" -#include "i915_memcpy.h" struct eb_vma { struct i915_vma *vma; @@ -1471,6 +1469,10 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb, int err; struct intel_engine_cs *engine = eb->engine; + /* If we need to copy for the cmdparser, we will stall anyway */ + if (eb_use_cmdparser(eb)) + return ERR_PTR(-EWOULDBLOCK); + if (!reloc_can_use_engine(engine)) { engine = engine->gt->engine_class[COPY_ENGINE_CLASS][0]; if (!engine) @@ -2385,217 +2387,6 @@ shadow_batch_pin(struct i915_execbuffer *eb, return vma; } -struct eb_parse_work { - struct dma_fence_work base; - struct intel_engine_cs *engine; - struct i915_vma *batch; - struct i915_vma *shadow; - struct i915_vma *trampoline; - unsigned long batch_offset; - unsigned long batch_length; - unsigned long *jump_whitelist; - const void *batch_map; - void *shadow_map; -}; - -static int __eb_parse(struct dma_fence_work *work) -{ - struct eb_parse_work *pw = container_of(work, typeof(*pw), base); - int ret; - bool cookie; - - cookie = dma_fence_begin_signalling(); - ret = intel_engine_cmd_parser(pw->engine, - pw->batch, - pw->batch_offset, - pw->batch_length, - pw->shadow, - pw->jump_whitelist, - pw->shadow_map, - pw->batch_map); - dma_fence_end_signalling(cookie); - - return ret; -} - -static void __eb_parse_release(struct dma_fence_work *work) -{ - struct eb_parse_work *pw = container_of(work, typeof(*pw), base); - - if (!IS_ERR_OR_NULL(pw->jump_whitelist)) - kfree(pw->jump_whitelist); - - if (pw->batch_map) - i915_gem_object_unpin_map(pw->batch->obj); - else - i915_gem_object_unpin_pages(pw->batch->obj); - - i915_gem_object_unpin_map(pw->shadow->obj); - - if (pw->trampoline) - i915_active_release(&pw->trampoline->active); - i915_active_release(&pw->shadow->active); - i915_active_release(&pw->batch->active); -} - -static const struct dma_fence_work_ops eb_parse_ops = { - .name = "eb_parse", - .work = __eb_parse, - .release = __eb_parse_release, -}; - -static inline int -__parser_mark_active(struct i915_vma *vma, - struct intel_timeline *tl, - struct dma_fence *fence) -{ - struct intel_gt_buffer_pool_node *node = vma->private; - - return i915_active_ref(&node->active, tl->fence_context, fence); -} - -static int -parser_mark_active(struct eb_parse_work *pw, struct intel_timeline *tl) -{ - int err; - - mutex_lock(&tl->mutex); - - err = __parser_mark_active(pw->shadow, tl, &pw->base.dma); - if (err) - goto unlock; - - if (pw->trampoline) { - err = __parser_mark_active(pw->trampoline, tl, &pw->base.dma); - if (err) - goto unlock; - } - -unlock: - mutex_unlock(&tl->mutex); - return err; -} - -static int eb_parse_pipeline(struct i915_execbuffer *eb, - struct i915_vma *shadow, - struct i915_vma *trampoline) -{ - struct eb_parse_work *pw; - struct drm_i915_gem_object *batch = eb->batch->vma->obj; - bool needs_clflush; - int err; - - GEM_BUG_ON(overflows_type(eb->batch_start_offset, pw->batch_offset)); - GEM_BUG_ON(overflows_type(eb->batch_len, pw->batch_length)); - - pw = kzalloc(sizeof(*pw), GFP_KERNEL); - if (!pw) - return -ENOMEM; - - err = i915_active_acquire(&eb->batch->vma->active); - if (err) - goto err_free; - - err = i915_active_acquire(&shadow->active); - if (err) - goto err_batch; - - if (trampoline) { - err = i915_active_acquire(&trampoline->active); - if (err) - goto err_shadow; - } - - pw->shadow_map = i915_gem_object_pin_map(shadow->obj, I915_MAP_WB); - if (IS_ERR(pw->shadow_map)) { - err = PTR_ERR(pw->shadow_map); - goto err_trampoline; - } - - needs_clflush = - !(batch->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ); - - pw->batch_map = ERR_PTR(-ENODEV); - if (needs_clflush && i915_has_memcpy_from_wc()) - pw->batch_map = i915_gem_object_pin_map(batch, I915_MAP_WC); - - if (IS_ERR(pw->batch_map)) { - err = i915_gem_object_pin_pages(batch); - if (err) - goto err_unmap_shadow; - pw->batch_map = NULL; - } - - pw->jump_whitelist = - intel_engine_cmd_parser_alloc_jump_whitelist(eb->batch_len, - trampoline); - if (IS_ERR(pw->jump_whitelist)) { - err = PTR_ERR(pw->jump_whitelist); - goto err_unmap_batch; - } - - dma_fence_work_init(&pw->base, &eb_parse_ops); - - pw->engine = eb->engine; - pw->batch = eb->batch->vma; - pw->batch_offset = eb->batch_start_offset; - pw->batch_length = eb->batch_len; - pw->shadow = shadow; - pw->trampoline = trampoline; - - /* Mark active refs early for this worker, in case we get interrupted */ - err = parser_mark_active(pw, eb->context->timeline); - if (err) - goto err_commit; - - err = dma_resv_reserve_shared(pw->batch->resv, 1); - if (err) - goto err_commit; - - err = dma_resv_reserve_shared(shadow->resv, 1); - if (err) - goto err_commit; - - /* Wait for all writes (and relocs) into the batch to complete */ - err = i915_sw_fence_await_reservation(&pw->base.chain, - pw->batch->resv, NULL, false, - 0, I915_FENCE_GFP); - if (err < 0) - goto err_commit; - - /* Keep the batch alive and unwritten as we parse */ - dma_resv_add_shared_fence(pw->batch->resv, &pw->base.dma); - - /* Force execution to wait for completion of the parser */ - dma_resv_add_excl_fence(shadow->resv, &pw->base.dma); - - dma_fence_work_commit_imm(&pw->base); - return 0; - -err_commit: - i915_sw_fence_set_error_once(&pw->base.chain, err); - dma_fence_work_commit_imm(&pw->base); - return err; - -err_unmap_batch: - if (pw->batch_map) - i915_gem_object_unpin_map(batch); - else - i915_gem_object_unpin_pages(batch); -err_unmap_shadow: - i915_gem_object_unpin_map(shadow->obj); -err_trampoline: - if (trampoline) - i915_active_release(&trampoline->active); -err_shadow: - i915_active_release(&shadow->active); -err_batch: - i915_active_release(&eb->batch->vma->active); -err_free: - kfree(pw); - return err; -} - static struct i915_vma *eb_dispatch_secure(struct i915_execbuffer *eb, struct i915_vma *vma) { /* @@ -2685,7 +2476,15 @@ static int eb_parse(struct i915_execbuffer *eb) goto err_trampoline; } - err = eb_parse_pipeline(eb, shadow, trampoline); + err = dma_resv_reserve_shared(shadow->resv, 1); + if (err) + goto err_trampoline; + + err = intel_engine_cmd_parser(eb->engine, + eb->batch->vma, + eb->batch_start_offset, + eb->batch_len, + shadow, trampoline); if (err) goto err_unpin_batch; 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 4df505e4c53ae..16162fc2782dc 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c @@ -125,6 +125,10 @@ static int igt_gpu_reloc(void *arg) intel_gt_pm_get(&eb.i915->gt); for_each_uabi_engine(eb.engine, eb.i915) { + if (intel_engine_requires_cmd_parser(eb.engine) || + intel_engine_using_cmd_parser(eb.engine)) + continue; + reloc_cache_init(&eb.reloc_cache, eb.i915); memset(map, POISON_INUSE, 4096); diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c index 3992c25a191da..00ec618d01590 100644 --- a/drivers/gpu/drm/i915/i915_cmd_parser.c +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c @@ -1145,19 +1145,41 @@ find_reg(const struct intel_engine_cs *engine, u32 addr) static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, struct drm_i915_gem_object *src_obj, unsigned long offset, unsigned long length, - void *dst, const void *src) + bool *needs_clflush_after) { - bool needs_clflush = - !(src_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ); - - if (src) { - GEM_BUG_ON(!needs_clflush); - i915_unaligned_memcpy_from_wc(dst, src + offset, length); - } else { - struct scatterlist *sg; + unsigned int src_needs_clflush; + unsigned int dst_needs_clflush; + void *dst, *src; + int ret; + + ret = i915_gem_object_prepare_write(dst_obj, &dst_needs_clflush); + if (ret) + return ERR_PTR(ret); + + dst = i915_gem_object_pin_map(dst_obj, I915_MAP_WB); + i915_gem_object_finish_access(dst_obj); + if (IS_ERR(dst)) + return dst; + + ret = i915_gem_object_prepare_read(src_obj, &src_needs_clflush); + if (ret) { + i915_gem_object_unpin_map(dst_obj); + return ERR_PTR(ret); + } + + src = ERR_PTR(-ENODEV); + if (src_needs_clflush && i915_has_memcpy_from_wc()) { + src = i915_gem_object_pin_map(src_obj, I915_MAP_WC); + if (!IS_ERR(src)) { + i915_unaligned_memcpy_from_wc(dst, + src + offset, + length); + i915_gem_object_unpin_map(src_obj); + } + } + if (IS_ERR(src)) { + unsigned long x, n, remain; void *ptr; - unsigned int x, sg_ofs; - unsigned long remain; /* * We can avoid clflushing partial cachelines before the write @@ -1168,40 +1190,34 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, * validate up to the end of the batch. */ remain = length; - if (!(dst_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ)) + if (dst_needs_clflush & CLFLUSH_BEFORE) remain = round_up(remain, boot_cpu_data.x86_clflush_size); ptr = dst; x = offset_in_page(offset); - sg = i915_gem_object_get_sg(src_obj, offset >> PAGE_SHIFT, &sg_ofs, false); - - while (remain) { - unsigned long sg_max = sg->length >> PAGE_SHIFT; - - for (; remain && sg_ofs < sg_max; sg_ofs++) { - unsigned long len = min(remain, PAGE_SIZE - x); - void *map; - - map = kmap_atomic(nth_page(sg_page(sg), sg_ofs)); - if (needs_clflush) - drm_clflush_virt_range(map + x, len); - memcpy(ptr, map + x, len); - kunmap_atomic(map); - - ptr += len; - remain -= len; - x = 0; - } - - sg_ofs = 0; - sg = sg_next(sg); + for (n = offset >> PAGE_SHIFT; remain; n++) { + int len = min(remain, PAGE_SIZE - x); + + src = kmap_atomic(i915_gem_object_get_page(src_obj, n)); + if (src_needs_clflush) + drm_clflush_virt_range(src + x, len); + memcpy(ptr, src + x, len); + kunmap_atomic(src); + + ptr += len; + remain -= len; + x = 0; } } + i915_gem_object_finish_access(src_obj); + memset32(dst + length, 0, (dst_obj->base.size - length) / sizeof(u32)); /* dst_obj is returned with vmap pinned */ + *needs_clflush_after = dst_needs_clflush & CLFLUSH_AFTER; + return dst; } @@ -1360,6 +1376,9 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length, if (target_cmd_index == offset) return 0; + if (IS_ERR(jump_whitelist)) + return PTR_ERR(jump_whitelist); + if (!test_bit(target_cmd_index, jump_whitelist)) { DRM_DEBUG("CMD: BB_START to 0x%llx not a previously executed cmd\n", jump_target); @@ -1369,28 +1388,10 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length, return 0; } -/** - * intel_engine_cmd_parser_alloc_jump_whitelist() - preallocate jump whitelist for intel_engine_cmd_parser() - * @batch_length: length of the commands in batch_obj - * @trampoline: Whether jump trampolines are used. - * - * Preallocates a jump whitelist for parsing the cmd buffer in intel_engine_cmd_parser(). - * This has to be preallocated, because the command parser runs in signaling context, - * and may not allocate any memory. - * - * Return: NULL or pointer to a jump whitelist, or ERR_PTR() on failure. Use - * IS_ERR() to check for errors. Must bre freed() with kfree(). - * - * NULL is a valid value, meaning no allocation was required. - */ -unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, - bool trampoline) +static unsigned long *alloc_whitelist(u32 batch_length) { unsigned long *jmp; - if (trampoline) - return NULL; - /* * We expect batch_length to be less than 256KiB for known users, * i.e. we need at most an 8KiB bitmap allocation which should be @@ -1425,21 +1426,21 @@ unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, * Return: non-zero if the parser finds violations or otherwise fails; -EACCES * if the batch appears legal but should use hardware parsing */ + int intel_engine_cmd_parser(struct intel_engine_cs *engine, struct i915_vma *batch, unsigned long batch_offset, unsigned long batch_length, struct i915_vma *shadow, - unsigned long *jump_whitelist, - void *shadow_map, - const void *batch_map) + bool trampoline) { u32 *cmd, *batch_end, offset = 0; struct drm_i915_cmd_descriptor default_desc = noop_desc; const struct drm_i915_cmd_descriptor *desc = &default_desc; + bool needs_clflush_after = false; + unsigned long *jump_whitelist; u64 batch_addr, shadow_addr; int ret = 0; - bool trampoline = !jump_whitelist; GEM_BUG_ON(!IS_ALIGNED(batch_offset, sizeof(*cmd))); GEM_BUG_ON(!IS_ALIGNED(batch_length, sizeof(*cmd))); @@ -1447,8 +1448,18 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, batch->size)); GEM_BUG_ON(!batch_length); - cmd = copy_batch(shadow->obj, batch->obj, batch_offset, batch_length, - shadow_map, batch_map); + cmd = copy_batch(shadow->obj, batch->obj, + batch_offset, batch_length, + &needs_clflush_after); + if (IS_ERR(cmd)) { + DRM_DEBUG("CMD: Failed to copy batch\n"); + return PTR_ERR(cmd); + } + + jump_whitelist = NULL; + if (!trampoline) + /* Defer failure until attempted use */ + jump_whitelist = alloc_whitelist(batch_length); shadow_addr = gen8_canonical_addr(shadow->node.start); batch_addr = gen8_canonical_addr(batch->node.start + batch_offset); @@ -1549,6 +1560,9 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, i915_gem_object_flush_map(shadow->obj); + if (!IS_ERR_OR_NULL(jump_whitelist)) + kfree(jump_whitelist); + i915_gem_object_unpin_map(shadow->obj); return ret; } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index d14cda2ff9230..5351376333b42 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1951,17 +1951,12 @@ const char *i915_cache_level_str(struct drm_i915_private *i915, int type); int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv); int intel_engine_init_cmd_parser(struct intel_engine_cs *engine); void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine); -unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, - bool trampoline); - int intel_engine_cmd_parser(struct intel_engine_cs *engine, struct i915_vma *batch, unsigned long batch_offset, unsigned long batch_length, struct i915_vma *shadow, - unsigned long *jump_whitelist, - void *shadow_map, - const void *batch_map); + bool trampoline); #define I915_CMD_PARSER_TRAMPOLINE_SIZE 8 /* intel_device_info.c */ -- 2.31.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A9532C07E96 for ; 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Sat, 10 Jul 2021 20:53:42 -0700 (PDT) Received: from omlet.lan ([68.203.99.148]) by smtp.gmail.com with ESMTPSA id a11sm2310188otr.48.2021.07.10.20.53.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jul 2021 20:53:42 -0700 (PDT) From: Jason Ekstrand To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH 1/5] drm/i915: Revert "drm/i915/gem: Asynchronous cmdparser" Date: Sat, 10 Jul 2021 22:53:32 -0500 Message-Id: <20210711035336.803025-2-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210711035336.803025-1-jason@jlekstrand.net> References: <20210711035336.803025-1-jason@jlekstrand.net> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , Jon Bloomfield , stable@vger.kernel.org, Jason Ekstrand Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This reverts 686c7c35abc2 ("drm/i915/gem: Asynchronous cmdparser"). The justification for this commit in the git history was a vague comment about getting it out from under the struct_mutex. While this may improve perf for some workloads on Gen7 platforms where we rely on the command parser for features such as indirect rendering, no numbers were provided to prove such an improvement. It claims to closed two gitlab/bugzilla issues but with no explanation whatsoever as to why or what bug it's fixing. Meanwhile, by moving command parsing off to an async callback, it leaves us with a problem of what to do on error. When things were synchronous, EXECBUFFER2 would fail with an error code if parsing failed. When moving it to async, we needed another way to handle that error and the solution employed was to set an error on the dma_fence and then trust that said error gets propagated to the client eventually. Moving back to synchronous will help us untangle the fence error propagation mess. This also reverts most of 0edbb9ba1bfe ("drm/i915: Move cmd parser pinning to execbuffer") which is a refactor of some of our allocation paths for asynchronous parsing. Now that everything is synchronous, we don't need it. v2 (Daniel Vetter): - Add stabel Cc and Fixes tag Signed-off-by: Jason Ekstrand Cc: # v5.6+ Fixes: 9e31c1fe45d5 ("drm/i915: Propagate errors on awaiting already signaled fences") Cc: Maarten Lankhorst Reviewed-by: Jon Bloomfield Acked-by: Daniel Vetter --- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 227 +----------------- .../i915/gem/selftests/i915_gem_execbuffer.c | 4 + drivers/gpu/drm/i915/i915_cmd_parser.c | 132 +++++----- drivers/gpu/drm/i915/i915_drv.h | 7 +- 4 files changed, 91 insertions(+), 279 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 5ea8b4e23e428..1ed7475de454d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -25,10 +25,8 @@ #include "i915_gem_clflush.h" #include "i915_gem_context.h" #include "i915_gem_ioctls.h" -#include "i915_sw_fence_work.h" #include "i915_trace.h" #include "i915_user_extensions.h" -#include "i915_memcpy.h" struct eb_vma { struct i915_vma *vma; @@ -1471,6 +1469,10 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb, int err; struct intel_engine_cs *engine = eb->engine; + /* If we need to copy for the cmdparser, we will stall anyway */ + if (eb_use_cmdparser(eb)) + return ERR_PTR(-EWOULDBLOCK); + if (!reloc_can_use_engine(engine)) { engine = engine->gt->engine_class[COPY_ENGINE_CLASS][0]; if (!engine) @@ -2385,217 +2387,6 @@ shadow_batch_pin(struct i915_execbuffer *eb, return vma; } -struct eb_parse_work { - struct dma_fence_work base; - struct intel_engine_cs *engine; - struct i915_vma *batch; - struct i915_vma *shadow; - struct i915_vma *trampoline; - unsigned long batch_offset; - unsigned long batch_length; - unsigned long *jump_whitelist; - const void *batch_map; - void *shadow_map; -}; - -static int __eb_parse(struct dma_fence_work *work) -{ - struct eb_parse_work *pw = container_of(work, typeof(*pw), base); - int ret; - bool cookie; - - cookie = dma_fence_begin_signalling(); - ret = intel_engine_cmd_parser(pw->engine, - pw->batch, - pw->batch_offset, - pw->batch_length, - pw->shadow, - pw->jump_whitelist, - pw->shadow_map, - pw->batch_map); - dma_fence_end_signalling(cookie); - - return ret; -} - -static void __eb_parse_release(struct dma_fence_work *work) -{ - struct eb_parse_work *pw = container_of(work, typeof(*pw), base); - - if (!IS_ERR_OR_NULL(pw->jump_whitelist)) - kfree(pw->jump_whitelist); - - if (pw->batch_map) - i915_gem_object_unpin_map(pw->batch->obj); - else - i915_gem_object_unpin_pages(pw->batch->obj); - - i915_gem_object_unpin_map(pw->shadow->obj); - - if (pw->trampoline) - i915_active_release(&pw->trampoline->active); - i915_active_release(&pw->shadow->active); - i915_active_release(&pw->batch->active); -} - -static const struct dma_fence_work_ops eb_parse_ops = { - .name = "eb_parse", - .work = __eb_parse, - .release = __eb_parse_release, -}; - -static inline int -__parser_mark_active(struct i915_vma *vma, - struct intel_timeline *tl, - struct dma_fence *fence) -{ - struct intel_gt_buffer_pool_node *node = vma->private; - - return i915_active_ref(&node->active, tl->fence_context, fence); -} - -static int -parser_mark_active(struct eb_parse_work *pw, struct intel_timeline *tl) -{ - int err; - - mutex_lock(&tl->mutex); - - err = __parser_mark_active(pw->shadow, tl, &pw->base.dma); - if (err) - goto unlock; - - if (pw->trampoline) { - err = __parser_mark_active(pw->trampoline, tl, &pw->base.dma); - if (err) - goto unlock; - } - -unlock: - mutex_unlock(&tl->mutex); - return err; -} - -static int eb_parse_pipeline(struct i915_execbuffer *eb, - struct i915_vma *shadow, - struct i915_vma *trampoline) -{ - struct eb_parse_work *pw; - struct drm_i915_gem_object *batch = eb->batch->vma->obj; - bool needs_clflush; - int err; - - GEM_BUG_ON(overflows_type(eb->batch_start_offset, pw->batch_offset)); - GEM_BUG_ON(overflows_type(eb->batch_len, pw->batch_length)); - - pw = kzalloc(sizeof(*pw), GFP_KERNEL); - if (!pw) - return -ENOMEM; - - err = i915_active_acquire(&eb->batch->vma->active); - if (err) - goto err_free; - - err = i915_active_acquire(&shadow->active); - if (err) - goto err_batch; - - if (trampoline) { - err = i915_active_acquire(&trampoline->active); - if (err) - goto err_shadow; - } - - pw->shadow_map = i915_gem_object_pin_map(shadow->obj, I915_MAP_WB); - if (IS_ERR(pw->shadow_map)) { - err = PTR_ERR(pw->shadow_map); - goto err_trampoline; - } - - needs_clflush = - !(batch->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ); - - pw->batch_map = ERR_PTR(-ENODEV); - if (needs_clflush && i915_has_memcpy_from_wc()) - pw->batch_map = i915_gem_object_pin_map(batch, I915_MAP_WC); - - if (IS_ERR(pw->batch_map)) { - err = i915_gem_object_pin_pages(batch); - if (err) - goto err_unmap_shadow; - pw->batch_map = NULL; - } - - pw->jump_whitelist = - intel_engine_cmd_parser_alloc_jump_whitelist(eb->batch_len, - trampoline); - if (IS_ERR(pw->jump_whitelist)) { - err = PTR_ERR(pw->jump_whitelist); - goto err_unmap_batch; - } - - dma_fence_work_init(&pw->base, &eb_parse_ops); - - pw->engine = eb->engine; - pw->batch = eb->batch->vma; - pw->batch_offset = eb->batch_start_offset; - pw->batch_length = eb->batch_len; - pw->shadow = shadow; - pw->trampoline = trampoline; - - /* Mark active refs early for this worker, in case we get interrupted */ - err = parser_mark_active(pw, eb->context->timeline); - if (err) - goto err_commit; - - err = dma_resv_reserve_shared(pw->batch->resv, 1); - if (err) - goto err_commit; - - err = dma_resv_reserve_shared(shadow->resv, 1); - if (err) - goto err_commit; - - /* Wait for all writes (and relocs) into the batch to complete */ - err = i915_sw_fence_await_reservation(&pw->base.chain, - pw->batch->resv, NULL, false, - 0, I915_FENCE_GFP); - if (err < 0) - goto err_commit; - - /* Keep the batch alive and unwritten as we parse */ - dma_resv_add_shared_fence(pw->batch->resv, &pw->base.dma); - - /* Force execution to wait for completion of the parser */ - dma_resv_add_excl_fence(shadow->resv, &pw->base.dma); - - dma_fence_work_commit_imm(&pw->base); - return 0; - -err_commit: - i915_sw_fence_set_error_once(&pw->base.chain, err); - dma_fence_work_commit_imm(&pw->base); - return err; - -err_unmap_batch: - if (pw->batch_map) - i915_gem_object_unpin_map(batch); - else - i915_gem_object_unpin_pages(batch); -err_unmap_shadow: - i915_gem_object_unpin_map(shadow->obj); -err_trampoline: - if (trampoline) - i915_active_release(&trampoline->active); -err_shadow: - i915_active_release(&shadow->active); -err_batch: - i915_active_release(&eb->batch->vma->active); -err_free: - kfree(pw); - return err; -} - static struct i915_vma *eb_dispatch_secure(struct i915_execbuffer *eb, struct i915_vma *vma) { /* @@ -2685,7 +2476,15 @@ static int eb_parse(struct i915_execbuffer *eb) goto err_trampoline; } - err = eb_parse_pipeline(eb, shadow, trampoline); + err = dma_resv_reserve_shared(shadow->resv, 1); + if (err) + goto err_trampoline; + + err = intel_engine_cmd_parser(eb->engine, + eb->batch->vma, + eb->batch_start_offset, + eb->batch_len, + shadow, trampoline); if (err) goto err_unpin_batch; 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 4df505e4c53ae..16162fc2782dc 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c @@ -125,6 +125,10 @@ static int igt_gpu_reloc(void *arg) intel_gt_pm_get(&eb.i915->gt); for_each_uabi_engine(eb.engine, eb.i915) { + if (intel_engine_requires_cmd_parser(eb.engine) || + intel_engine_using_cmd_parser(eb.engine)) + continue; + reloc_cache_init(&eb.reloc_cache, eb.i915); memset(map, POISON_INUSE, 4096); diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c index 3992c25a191da..00ec618d01590 100644 --- a/drivers/gpu/drm/i915/i915_cmd_parser.c +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c @@ -1145,19 +1145,41 @@ find_reg(const struct intel_engine_cs *engine, u32 addr) static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, struct drm_i915_gem_object *src_obj, unsigned long offset, unsigned long length, - void *dst, const void *src) + bool *needs_clflush_after) { - bool needs_clflush = - !(src_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ); - - if (src) { - GEM_BUG_ON(!needs_clflush); - i915_unaligned_memcpy_from_wc(dst, src + offset, length); - } else { - struct scatterlist *sg; + unsigned int src_needs_clflush; + unsigned int dst_needs_clflush; + void *dst, *src; + int ret; + + ret = i915_gem_object_prepare_write(dst_obj, &dst_needs_clflush); + if (ret) + return ERR_PTR(ret); + + dst = i915_gem_object_pin_map(dst_obj, I915_MAP_WB); + i915_gem_object_finish_access(dst_obj); + if (IS_ERR(dst)) + return dst; + + ret = i915_gem_object_prepare_read(src_obj, &src_needs_clflush); + if (ret) { + i915_gem_object_unpin_map(dst_obj); + return ERR_PTR(ret); + } + + src = ERR_PTR(-ENODEV); + if (src_needs_clflush && i915_has_memcpy_from_wc()) { + src = i915_gem_object_pin_map(src_obj, I915_MAP_WC); + if (!IS_ERR(src)) { + i915_unaligned_memcpy_from_wc(dst, + src + offset, + length); + i915_gem_object_unpin_map(src_obj); + } + } + if (IS_ERR(src)) { + unsigned long x, n, remain; void *ptr; - unsigned int x, sg_ofs; - unsigned long remain; /* * We can avoid clflushing partial cachelines before the write @@ -1168,40 +1190,34 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, * validate up to the end of the batch. */ remain = length; - if (!(dst_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ)) + if (dst_needs_clflush & CLFLUSH_BEFORE) remain = round_up(remain, boot_cpu_data.x86_clflush_size); ptr = dst; x = offset_in_page(offset); - sg = i915_gem_object_get_sg(src_obj, offset >> PAGE_SHIFT, &sg_ofs, false); - - while (remain) { - unsigned long sg_max = sg->length >> PAGE_SHIFT; - - for (; remain && sg_ofs < sg_max; sg_ofs++) { - unsigned long len = min(remain, PAGE_SIZE - x); - void *map; - - map = kmap_atomic(nth_page(sg_page(sg), sg_ofs)); - if (needs_clflush) - drm_clflush_virt_range(map + x, len); - memcpy(ptr, map + x, len); - kunmap_atomic(map); - - ptr += len; - remain -= len; - x = 0; - } - - sg_ofs = 0; - sg = sg_next(sg); + for (n = offset >> PAGE_SHIFT; remain; n++) { + int len = min(remain, PAGE_SIZE - x); + + src = kmap_atomic(i915_gem_object_get_page(src_obj, n)); + if (src_needs_clflush) + drm_clflush_virt_range(src + x, len); + memcpy(ptr, src + x, len); + kunmap_atomic(src); + + ptr += len; + remain -= len; + x = 0; } } + i915_gem_object_finish_access(src_obj); + memset32(dst + length, 0, (dst_obj->base.size - length) / sizeof(u32)); /* dst_obj is returned with vmap pinned */ + *needs_clflush_after = dst_needs_clflush & CLFLUSH_AFTER; + return dst; } @@ -1360,6 +1376,9 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length, if (target_cmd_index == offset) return 0; + if (IS_ERR(jump_whitelist)) + return PTR_ERR(jump_whitelist); + if (!test_bit(target_cmd_index, jump_whitelist)) { DRM_DEBUG("CMD: BB_START to 0x%llx not a previously executed cmd\n", jump_target); @@ -1369,28 +1388,10 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length, return 0; } -/** - * intel_engine_cmd_parser_alloc_jump_whitelist() - preallocate jump whitelist for intel_engine_cmd_parser() - * @batch_length: length of the commands in batch_obj - * @trampoline: Whether jump trampolines are used. - * - * Preallocates a jump whitelist for parsing the cmd buffer in intel_engine_cmd_parser(). - * This has to be preallocated, because the command parser runs in signaling context, - * and may not allocate any memory. - * - * Return: NULL or pointer to a jump whitelist, or ERR_PTR() on failure. Use - * IS_ERR() to check for errors. Must bre freed() with kfree(). - * - * NULL is a valid value, meaning no allocation was required. - */ -unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, - bool trampoline) +static unsigned long *alloc_whitelist(u32 batch_length) { unsigned long *jmp; - if (trampoline) - return NULL; - /* * We expect batch_length to be less than 256KiB for known users, * i.e. we need at most an 8KiB bitmap allocation which should be @@ -1425,21 +1426,21 @@ unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, * Return: non-zero if the parser finds violations or otherwise fails; -EACCES * if the batch appears legal but should use hardware parsing */ + int intel_engine_cmd_parser(struct intel_engine_cs *engine, struct i915_vma *batch, unsigned long batch_offset, unsigned long batch_length, struct i915_vma *shadow, - unsigned long *jump_whitelist, - void *shadow_map, - const void *batch_map) + bool trampoline) { u32 *cmd, *batch_end, offset = 0; struct drm_i915_cmd_descriptor default_desc = noop_desc; const struct drm_i915_cmd_descriptor *desc = &default_desc; + bool needs_clflush_after = false; + unsigned long *jump_whitelist; u64 batch_addr, shadow_addr; int ret = 0; - bool trampoline = !jump_whitelist; GEM_BUG_ON(!IS_ALIGNED(batch_offset, sizeof(*cmd))); GEM_BUG_ON(!IS_ALIGNED(batch_length, sizeof(*cmd))); @@ -1447,8 +1448,18 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, batch->size)); GEM_BUG_ON(!batch_length); - cmd = copy_batch(shadow->obj, batch->obj, batch_offset, batch_length, - shadow_map, batch_map); + cmd = copy_batch(shadow->obj, batch->obj, + batch_offset, batch_length, + &needs_clflush_after); + if (IS_ERR(cmd)) { + DRM_DEBUG("CMD: Failed to copy batch\n"); + return PTR_ERR(cmd); + } + + jump_whitelist = NULL; + if (!trampoline) + /* Defer failure until attempted use */ + jump_whitelist = alloc_whitelist(batch_length); shadow_addr = gen8_canonical_addr(shadow->node.start); batch_addr = gen8_canonical_addr(batch->node.start + batch_offset); @@ -1549,6 +1560,9 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, i915_gem_object_flush_map(shadow->obj); + if (!IS_ERR_OR_NULL(jump_whitelist)) + kfree(jump_whitelist); + i915_gem_object_unpin_map(shadow->obj); return ret; } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index d14cda2ff9230..5351376333b42 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1951,17 +1951,12 @@ const char *i915_cache_level_str(struct drm_i915_private *i915, int type); int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv); int intel_engine_init_cmd_parser(struct intel_engine_cs *engine); void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine); -unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, - bool trampoline); - int intel_engine_cmd_parser(struct intel_engine_cs *engine, struct i915_vma *batch, unsigned long batch_offset, unsigned long batch_length, struct i915_vma *shadow, - unsigned long *jump_whitelist, - void *shadow_map, - const void *batch_map); + bool trampoline); #define I915_CMD_PARSER_TRAMPOLINE_SIZE 8 /* intel_device_info.c */ -- 2.31.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 547CBC07E9B for ; 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Sat, 10 Jul 2021 20:53:42 -0700 (PDT) Received: from omlet.lan ([68.203.99.148]) by smtp.gmail.com with ESMTPSA id a11sm2310188otr.48.2021.07.10.20.53.41 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 Jul 2021 20:53:42 -0700 (PDT) From: Jason Ekstrand To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Date: Sat, 10 Jul 2021 22:53:32 -0500 Message-Id: <20210711035336.803025-2-jason@jlekstrand.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210711035336.803025-1-jason@jlekstrand.net> References: <20210711035336.803025-1-jason@jlekstrand.net> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH 1/5] drm/i915: Revert "drm/i915/gem: Asynchronous cmdparser" X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daniel Vetter , stable@vger.kernel.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This reverts 686c7c35abc2 ("drm/i915/gem: Asynchronous cmdparser"). The justification for this commit in the git history was a vague comment about getting it out from under the struct_mutex. While this may improve perf for some workloads on Gen7 platforms where we rely on the command parser for features such as indirect rendering, no numbers were provided to prove such an improvement. It claims to closed two gitlab/bugzilla issues but with no explanation whatsoever as to why or what bug it's fixing. Meanwhile, by moving command parsing off to an async callback, it leaves us with a problem of what to do on error. When things were synchronous, EXECBUFFER2 would fail with an error code if parsing failed. When moving it to async, we needed another way to handle that error and the solution employed was to set an error on the dma_fence and then trust that said error gets propagated to the client eventually. Moving back to synchronous will help us untangle the fence error propagation mess. This also reverts most of 0edbb9ba1bfe ("drm/i915: Move cmd parser pinning to execbuffer") which is a refactor of some of our allocation paths for asynchronous parsing. Now that everything is synchronous, we don't need it. v2 (Daniel Vetter): - Add stabel Cc and Fixes tag Signed-off-by: Jason Ekstrand Cc: # v5.6+ Fixes: 9e31c1fe45d5 ("drm/i915: Propagate errors on awaiting already signaled fences") Cc: Maarten Lankhorst Reviewed-by: Jon Bloomfield Acked-by: Daniel Vetter --- .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 227 +----------------- .../i915/gem/selftests/i915_gem_execbuffer.c | 4 + drivers/gpu/drm/i915/i915_cmd_parser.c | 132 +++++----- drivers/gpu/drm/i915/i915_drv.h | 7 +- 4 files changed, 91 insertions(+), 279 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 5ea8b4e23e428..1ed7475de454d 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -25,10 +25,8 @@ #include "i915_gem_clflush.h" #include "i915_gem_context.h" #include "i915_gem_ioctls.h" -#include "i915_sw_fence_work.h" #include "i915_trace.h" #include "i915_user_extensions.h" -#include "i915_memcpy.h" struct eb_vma { struct i915_vma *vma; @@ -1471,6 +1469,10 @@ static u32 *reloc_gpu(struct i915_execbuffer *eb, int err; struct intel_engine_cs *engine = eb->engine; + /* If we need to copy for the cmdparser, we will stall anyway */ + if (eb_use_cmdparser(eb)) + return ERR_PTR(-EWOULDBLOCK); + if (!reloc_can_use_engine(engine)) { engine = engine->gt->engine_class[COPY_ENGINE_CLASS][0]; if (!engine) @@ -2385,217 +2387,6 @@ shadow_batch_pin(struct i915_execbuffer *eb, return vma; } -struct eb_parse_work { - struct dma_fence_work base; - struct intel_engine_cs *engine; - struct i915_vma *batch; - struct i915_vma *shadow; - struct i915_vma *trampoline; - unsigned long batch_offset; - unsigned long batch_length; - unsigned long *jump_whitelist; - const void *batch_map; - void *shadow_map; -}; - -static int __eb_parse(struct dma_fence_work *work) -{ - struct eb_parse_work *pw = container_of(work, typeof(*pw), base); - int ret; - bool cookie; - - cookie = dma_fence_begin_signalling(); - ret = intel_engine_cmd_parser(pw->engine, - pw->batch, - pw->batch_offset, - pw->batch_length, - pw->shadow, - pw->jump_whitelist, - pw->shadow_map, - pw->batch_map); - dma_fence_end_signalling(cookie); - - return ret; -} - -static void __eb_parse_release(struct dma_fence_work *work) -{ - struct eb_parse_work *pw = container_of(work, typeof(*pw), base); - - if (!IS_ERR_OR_NULL(pw->jump_whitelist)) - kfree(pw->jump_whitelist); - - if (pw->batch_map) - i915_gem_object_unpin_map(pw->batch->obj); - else - i915_gem_object_unpin_pages(pw->batch->obj); - - i915_gem_object_unpin_map(pw->shadow->obj); - - if (pw->trampoline) - i915_active_release(&pw->trampoline->active); - i915_active_release(&pw->shadow->active); - i915_active_release(&pw->batch->active); -} - -static const struct dma_fence_work_ops eb_parse_ops = { - .name = "eb_parse", - .work = __eb_parse, - .release = __eb_parse_release, -}; - -static inline int -__parser_mark_active(struct i915_vma *vma, - struct intel_timeline *tl, - struct dma_fence *fence) -{ - struct intel_gt_buffer_pool_node *node = vma->private; - - return i915_active_ref(&node->active, tl->fence_context, fence); -} - -static int -parser_mark_active(struct eb_parse_work *pw, struct intel_timeline *tl) -{ - int err; - - mutex_lock(&tl->mutex); - - err = __parser_mark_active(pw->shadow, tl, &pw->base.dma); - if (err) - goto unlock; - - if (pw->trampoline) { - err = __parser_mark_active(pw->trampoline, tl, &pw->base.dma); - if (err) - goto unlock; - } - -unlock: - mutex_unlock(&tl->mutex); - return err; -} - -static int eb_parse_pipeline(struct i915_execbuffer *eb, - struct i915_vma *shadow, - struct i915_vma *trampoline) -{ - struct eb_parse_work *pw; - struct drm_i915_gem_object *batch = eb->batch->vma->obj; - bool needs_clflush; - int err; - - GEM_BUG_ON(overflows_type(eb->batch_start_offset, pw->batch_offset)); - GEM_BUG_ON(overflows_type(eb->batch_len, pw->batch_length)); - - pw = kzalloc(sizeof(*pw), GFP_KERNEL); - if (!pw) - return -ENOMEM; - - err = i915_active_acquire(&eb->batch->vma->active); - if (err) - goto err_free; - - err = i915_active_acquire(&shadow->active); - if (err) - goto err_batch; - - if (trampoline) { - err = i915_active_acquire(&trampoline->active); - if (err) - goto err_shadow; - } - - pw->shadow_map = i915_gem_object_pin_map(shadow->obj, I915_MAP_WB); - if (IS_ERR(pw->shadow_map)) { - err = PTR_ERR(pw->shadow_map); - goto err_trampoline; - } - - needs_clflush = - !(batch->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ); - - pw->batch_map = ERR_PTR(-ENODEV); - if (needs_clflush && i915_has_memcpy_from_wc()) - pw->batch_map = i915_gem_object_pin_map(batch, I915_MAP_WC); - - if (IS_ERR(pw->batch_map)) { - err = i915_gem_object_pin_pages(batch); - if (err) - goto err_unmap_shadow; - pw->batch_map = NULL; - } - - pw->jump_whitelist = - intel_engine_cmd_parser_alloc_jump_whitelist(eb->batch_len, - trampoline); - if (IS_ERR(pw->jump_whitelist)) { - err = PTR_ERR(pw->jump_whitelist); - goto err_unmap_batch; - } - - dma_fence_work_init(&pw->base, &eb_parse_ops); - - pw->engine = eb->engine; - pw->batch = eb->batch->vma; - pw->batch_offset = eb->batch_start_offset; - pw->batch_length = eb->batch_len; - pw->shadow = shadow; - pw->trampoline = trampoline; - - /* Mark active refs early for this worker, in case we get interrupted */ - err = parser_mark_active(pw, eb->context->timeline); - if (err) - goto err_commit; - - err = dma_resv_reserve_shared(pw->batch->resv, 1); - if (err) - goto err_commit; - - err = dma_resv_reserve_shared(shadow->resv, 1); - if (err) - goto err_commit; - - /* Wait for all writes (and relocs) into the batch to complete */ - err = i915_sw_fence_await_reservation(&pw->base.chain, - pw->batch->resv, NULL, false, - 0, I915_FENCE_GFP); - if (err < 0) - goto err_commit; - - /* Keep the batch alive and unwritten as we parse */ - dma_resv_add_shared_fence(pw->batch->resv, &pw->base.dma); - - /* Force execution to wait for completion of the parser */ - dma_resv_add_excl_fence(shadow->resv, &pw->base.dma); - - dma_fence_work_commit_imm(&pw->base); - return 0; - -err_commit: - i915_sw_fence_set_error_once(&pw->base.chain, err); - dma_fence_work_commit_imm(&pw->base); - return err; - -err_unmap_batch: - if (pw->batch_map) - i915_gem_object_unpin_map(batch); - else - i915_gem_object_unpin_pages(batch); -err_unmap_shadow: - i915_gem_object_unpin_map(shadow->obj); -err_trampoline: - if (trampoline) - i915_active_release(&trampoline->active); -err_shadow: - i915_active_release(&shadow->active); -err_batch: - i915_active_release(&eb->batch->vma->active); -err_free: - kfree(pw); - return err; -} - static struct i915_vma *eb_dispatch_secure(struct i915_execbuffer *eb, struct i915_vma *vma) { /* @@ -2685,7 +2476,15 @@ static int eb_parse(struct i915_execbuffer *eb) goto err_trampoline; } - err = eb_parse_pipeline(eb, shadow, trampoline); + err = dma_resv_reserve_shared(shadow->resv, 1); + if (err) + goto err_trampoline; + + err = intel_engine_cmd_parser(eb->engine, + eb->batch->vma, + eb->batch_start_offset, + eb->batch_len, + shadow, trampoline); if (err) goto err_unpin_batch; 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 4df505e4c53ae..16162fc2782dc 100644 --- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_execbuffer.c @@ -125,6 +125,10 @@ static int igt_gpu_reloc(void *arg) intel_gt_pm_get(&eb.i915->gt); for_each_uabi_engine(eb.engine, eb.i915) { + if (intel_engine_requires_cmd_parser(eb.engine) || + intel_engine_using_cmd_parser(eb.engine)) + continue; + reloc_cache_init(&eb.reloc_cache, eb.i915); memset(map, POISON_INUSE, 4096); diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c index 3992c25a191da..00ec618d01590 100644 --- a/drivers/gpu/drm/i915/i915_cmd_parser.c +++ b/drivers/gpu/drm/i915/i915_cmd_parser.c @@ -1145,19 +1145,41 @@ find_reg(const struct intel_engine_cs *engine, u32 addr) static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, struct drm_i915_gem_object *src_obj, unsigned long offset, unsigned long length, - void *dst, const void *src) + bool *needs_clflush_after) { - bool needs_clflush = - !(src_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ); - - if (src) { - GEM_BUG_ON(!needs_clflush); - i915_unaligned_memcpy_from_wc(dst, src + offset, length); - } else { - struct scatterlist *sg; + unsigned int src_needs_clflush; + unsigned int dst_needs_clflush; + void *dst, *src; + int ret; + + ret = i915_gem_object_prepare_write(dst_obj, &dst_needs_clflush); + if (ret) + return ERR_PTR(ret); + + dst = i915_gem_object_pin_map(dst_obj, I915_MAP_WB); + i915_gem_object_finish_access(dst_obj); + if (IS_ERR(dst)) + return dst; + + ret = i915_gem_object_prepare_read(src_obj, &src_needs_clflush); + if (ret) { + i915_gem_object_unpin_map(dst_obj); + return ERR_PTR(ret); + } + + src = ERR_PTR(-ENODEV); + if (src_needs_clflush && i915_has_memcpy_from_wc()) { + src = i915_gem_object_pin_map(src_obj, I915_MAP_WC); + if (!IS_ERR(src)) { + i915_unaligned_memcpy_from_wc(dst, + src + offset, + length); + i915_gem_object_unpin_map(src_obj); + } + } + if (IS_ERR(src)) { + unsigned long x, n, remain; void *ptr; - unsigned int x, sg_ofs; - unsigned long remain; /* * We can avoid clflushing partial cachelines before the write @@ -1168,40 +1190,34 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj, * validate up to the end of the batch. */ remain = length; - if (!(dst_obj->cache_coherent & I915_BO_CACHE_COHERENT_FOR_READ)) + if (dst_needs_clflush & CLFLUSH_BEFORE) remain = round_up(remain, boot_cpu_data.x86_clflush_size); ptr = dst; x = offset_in_page(offset); - sg = i915_gem_object_get_sg(src_obj, offset >> PAGE_SHIFT, &sg_ofs, false); - - while (remain) { - unsigned long sg_max = sg->length >> PAGE_SHIFT; - - for (; remain && sg_ofs < sg_max; sg_ofs++) { - unsigned long len = min(remain, PAGE_SIZE - x); - void *map; - - map = kmap_atomic(nth_page(sg_page(sg), sg_ofs)); - if (needs_clflush) - drm_clflush_virt_range(map + x, len); - memcpy(ptr, map + x, len); - kunmap_atomic(map); - - ptr += len; - remain -= len; - x = 0; - } - - sg_ofs = 0; - sg = sg_next(sg); + for (n = offset >> PAGE_SHIFT; remain; n++) { + int len = min(remain, PAGE_SIZE - x); + + src = kmap_atomic(i915_gem_object_get_page(src_obj, n)); + if (src_needs_clflush) + drm_clflush_virt_range(src + x, len); + memcpy(ptr, src + x, len); + kunmap_atomic(src); + + ptr += len; + remain -= len; + x = 0; } } + i915_gem_object_finish_access(src_obj); + memset32(dst + length, 0, (dst_obj->base.size - length) / sizeof(u32)); /* dst_obj is returned with vmap pinned */ + *needs_clflush_after = dst_needs_clflush & CLFLUSH_AFTER; + return dst; } @@ -1360,6 +1376,9 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length, if (target_cmd_index == offset) return 0; + if (IS_ERR(jump_whitelist)) + return PTR_ERR(jump_whitelist); + if (!test_bit(target_cmd_index, jump_whitelist)) { DRM_DEBUG("CMD: BB_START to 0x%llx not a previously executed cmd\n", jump_target); @@ -1369,28 +1388,10 @@ static int check_bbstart(u32 *cmd, u32 offset, u32 length, return 0; } -/** - * intel_engine_cmd_parser_alloc_jump_whitelist() - preallocate jump whitelist for intel_engine_cmd_parser() - * @batch_length: length of the commands in batch_obj - * @trampoline: Whether jump trampolines are used. - * - * Preallocates a jump whitelist for parsing the cmd buffer in intel_engine_cmd_parser(). - * This has to be preallocated, because the command parser runs in signaling context, - * and may not allocate any memory. - * - * Return: NULL or pointer to a jump whitelist, or ERR_PTR() on failure. Use - * IS_ERR() to check for errors. Must bre freed() with kfree(). - * - * NULL is a valid value, meaning no allocation was required. - */ -unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, - bool trampoline) +static unsigned long *alloc_whitelist(u32 batch_length) { unsigned long *jmp; - if (trampoline) - return NULL; - /* * We expect batch_length to be less than 256KiB for known users, * i.e. we need at most an 8KiB bitmap allocation which should be @@ -1425,21 +1426,21 @@ unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, * Return: non-zero if the parser finds violations or otherwise fails; -EACCES * if the batch appears legal but should use hardware parsing */ + int intel_engine_cmd_parser(struct intel_engine_cs *engine, struct i915_vma *batch, unsigned long batch_offset, unsigned long batch_length, struct i915_vma *shadow, - unsigned long *jump_whitelist, - void *shadow_map, - const void *batch_map) + bool trampoline) { u32 *cmd, *batch_end, offset = 0; struct drm_i915_cmd_descriptor default_desc = noop_desc; const struct drm_i915_cmd_descriptor *desc = &default_desc; + bool needs_clflush_after = false; + unsigned long *jump_whitelist; u64 batch_addr, shadow_addr; int ret = 0; - bool trampoline = !jump_whitelist; GEM_BUG_ON(!IS_ALIGNED(batch_offset, sizeof(*cmd))); GEM_BUG_ON(!IS_ALIGNED(batch_length, sizeof(*cmd))); @@ -1447,8 +1448,18 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, batch->size)); GEM_BUG_ON(!batch_length); - cmd = copy_batch(shadow->obj, batch->obj, batch_offset, batch_length, - shadow_map, batch_map); + cmd = copy_batch(shadow->obj, batch->obj, + batch_offset, batch_length, + &needs_clflush_after); + if (IS_ERR(cmd)) { + DRM_DEBUG("CMD: Failed to copy batch\n"); + return PTR_ERR(cmd); + } + + jump_whitelist = NULL; + if (!trampoline) + /* Defer failure until attempted use */ + jump_whitelist = alloc_whitelist(batch_length); shadow_addr = gen8_canonical_addr(shadow->node.start); batch_addr = gen8_canonical_addr(batch->node.start + batch_offset); @@ -1549,6 +1560,9 @@ int intel_engine_cmd_parser(struct intel_engine_cs *engine, i915_gem_object_flush_map(shadow->obj); + if (!IS_ERR_OR_NULL(jump_whitelist)) + kfree(jump_whitelist); + i915_gem_object_unpin_map(shadow->obj); return ret; } diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index d14cda2ff9230..5351376333b42 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1951,17 +1951,12 @@ const char *i915_cache_level_str(struct drm_i915_private *i915, int type); int i915_cmd_parser_get_version(struct drm_i915_private *dev_priv); int intel_engine_init_cmd_parser(struct intel_engine_cs *engine); void intel_engine_cleanup_cmd_parser(struct intel_engine_cs *engine); -unsigned long *intel_engine_cmd_parser_alloc_jump_whitelist(u32 batch_length, - bool trampoline); - int intel_engine_cmd_parser(struct intel_engine_cs *engine, struct i915_vma *batch, unsigned long batch_offset, unsigned long batch_length, struct i915_vma *shadow, - unsigned long *jump_whitelist, - void *shadow_map, - const void *batch_map); + bool trampoline); #define I915_CMD_PARSER_TRAMPOLINE_SIZE 8 /* intel_device_info.c */ -- 2.31.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx