From patchwork Mon Mar 28 17:16:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yang, Fei" X-Patchwork-Id: 12793969 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D4BB0C433EF for ; Mon, 28 Mar 2022 17:22:54 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id BEA9A10E729; Mon, 28 Mar 2022 17:22:53 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id F3E7710E260; Mon, 28 Mar 2022 17:22:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1648488172; x=1680024172; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=HfsPiLq0ztSHr3s8CMgV1b/7E5GBr73iPbkBKW7wxVY=; b=TZ4e5UkBswwdqzFgt6P6Gr30pjKJnX5Mw6KZXaf9uZj0P1V4ehvglXjZ iDAKq4cuMPfNfgGf+9yGGf/vnqVPpsmo0IcEjd/BAdVuk+RGGlk8YNYbW 099QJ+YEomVA9XFhAeCLwgnf3KAx0NapTA2vyVOohV7rdpKrXb/U0h6sI vZFpOj4FffgzFTjpaadlBatdYlHhe0xTWdZgtt9L1wj3SwsXhIC3u9Bgj Pj95zCa3gLkEIBjc89SgJ3SYGhjjTBtnReIb3A3Yciz3RQMu3li/t9yJI rOBto/O/FyEeTE1X/N8IXwdsMA1VNbPrPFFjPt8alZCGfbVfCyNHxF2Vk w==; X-IronPort-AV: E=McAfee;i="6200,9189,10300"; a="345496453" X-IronPort-AV: E=Sophos;i="5.90,218,1643702400"; d="scan'208";a="345496453" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Mar 2022 10:22:51 -0700 X-IronPort-AV: E=Sophos;i="5.90,218,1643702400"; d="scan'208";a="694438281" Received: from fphy-dev.jf.intel.com (HELO fyang16-desk.jf.intel.com) ([134.134.244.167]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Mar 2022 10:22:51 -0700 From: fei.yang@intel.com To: intel-gfx@lists.freedesktop.org Subject: [PATCH] drm/i915: avoid concurrent writes to aux_inv Date: Mon, 28 Mar 2022 10:16:50 -0700 Message-Id: <20220328171650.1900674-1-fei.yang@intel.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 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: stuart.summers@intel.com, Fei Yang , chris.p.wilson@intel.com, dri-devel@lists.freedesktop.org, tvrtko.ursulin@intel.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Fei Yang GPU hangs have been observed when multiple engines write to the same aux_inv register at the same time. To avoid this each engine should only invalidate its own auxiliary table. The function gen12_emit_flush_xcs() currently invalidate the auxiliary table for all engines because the rq->engine is not necessarily the engine eventually carrying out the request, and potentially the engine could even be a virtual one (with engine->instance being -1). With the MMIO remap feature, we can actually set bit 17 of MI_LRI instruction and let the hardware to figure out the local aux_inv register at runtime to avoid invalidating auxiliary table for all engines. Bspec: 45728 v2: Invalidate AUX table for indirect context as well. Cc: Stuart Summers Cc: Tvrtko Ursulin Signed-off-by: Chris Wilson Signed-off-by: Fei Yang Reviewed-by: Tvrtko Ursulin --- drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 50 +++++--------------- drivers/gpu/drm/i915/gt/gen8_engine_cs.h | 4 +- drivers/gpu/drm/i915/gt/intel_gpu_commands.h | 1 + drivers/gpu/drm/i915/gt/intel_lrc.c | 12 +++++ 4 files changed, 27 insertions(+), 40 deletions(-) diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c index 36148887c699..047b5a710149 100644 --- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c @@ -6,7 +6,6 @@ #include "gen8_engine_cs.h" #include "i915_drv.h" #include "intel_gpu_commands.h" -#include "intel_gt_regs.h" #include "intel_lrc.h" #include "intel_ring.h" @@ -165,33 +164,9 @@ static u32 preparser_disable(bool state) return MI_ARB_CHECK | 1 << 8 | state; } -static i915_reg_t aux_inv_reg(const struct intel_engine_cs *engine) +u32 *gen12_emit_aux_table_inv(u32 *cs, const i915_reg_t inv_reg) { - static const i915_reg_t vd[] = { - GEN12_VD0_AUX_NV, - GEN12_VD1_AUX_NV, - GEN12_VD2_AUX_NV, - GEN12_VD3_AUX_NV, - }; - - static const i915_reg_t ve[] = { - GEN12_VE0_AUX_NV, - GEN12_VE1_AUX_NV, - }; - - if (engine->class == VIDEO_DECODE_CLASS) - return vd[engine->instance]; - - if (engine->class == VIDEO_ENHANCEMENT_CLASS) - return ve[engine->instance]; - - GEM_BUG_ON("unknown aux_inv reg\n"); - return INVALID_MMIO_REG; -} - -static u32 *gen12_emit_aux_table_inv(const i915_reg_t inv_reg, u32 *cs) -{ - *cs++ = MI_LOAD_REGISTER_IMM(1); + *cs++ = MI_LOAD_REGISTER_IMM(1) | MI_LRI_MMIO_REMAP_EN; *cs++ = i915_mmio_reg_offset(inv_reg); *cs++ = AUX_INV; *cs++ = MI_NOOP; @@ -274,7 +249,7 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode) if (!HAS_FLAT_CCS(rq->engine->i915)) { /* hsdes: 1809175790 */ - cs = gen12_emit_aux_table_inv(GEN12_GFX_CCS_AUX_NV, cs); + cs = gen12_emit_aux_table_inv(cs, GEN12_GFX_CCS_AUX_NV); } *cs++ = preparser_disable(false); @@ -293,10 +268,12 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode) if (mode & EMIT_INVALIDATE) { cmd += 2; - if (!HAS_FLAT_CCS(rq->engine->i915)) { + if (!HAS_FLAT_CCS(rq->engine->i915) && + (rq->engine->class == VIDEO_DECODE_CLASS || + rq->engine->class == VIDEO_ENHANCEMENT_CLASS)) { aux_inv = rq->engine->mask & ~BIT(BCS0); if (aux_inv) - cmd += 2 * hweight32(aux_inv) + 2; + cmd += 4; } } @@ -329,15 +306,10 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode) *cs++ = 0; /* value */ if (aux_inv) { /* hsdes: 1809175790 */ - struct intel_engine_cs *engine; - unsigned int tmp; - - *cs++ = MI_LOAD_REGISTER_IMM(hweight32(aux_inv)); - for_each_engine_masked(engine, rq->engine->gt, aux_inv, tmp) { - *cs++ = i915_mmio_reg_offset(aux_inv_reg(engine)); - *cs++ = AUX_INV; - } - *cs++ = MI_NOOP; + if (rq->engine->class == VIDEO_DECODE_CLASS) + cs = gen12_emit_aux_table_inv(cs, GEN12_VD0_AUX_NV); + else + cs = gen12_emit_aux_table_inv(cs, GEN12_VE0_AUX_NV); } if (mode & EMIT_INVALIDATE) diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.h b/drivers/gpu/drm/i915/gt/gen8_engine_cs.h index cc6e21d3662a..107ab42539ab 100644 --- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.h +++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.h @@ -10,7 +10,7 @@ #include #include "i915_gem.h" /* GEM_BUG_ON */ - +#include "intel_gt_regs.h" #include "intel_gpu_commands.h" struct i915_request; @@ -38,6 +38,8 @@ u32 *gen8_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs); u32 *gen11_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs); u32 *gen12_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs); +u32 *gen12_emit_aux_table_inv(u32 *cs, const i915_reg_t inv_reg); + static inline u32 * __gen8_emit_pipe_control(u32 *batch, u32 flags0, u32 flags1, u32 offset) { diff --git a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h index d112ffd56418..4243be030bc1 100644 --- a/drivers/gpu/drm/i915/gt/intel_gpu_commands.h +++ b/drivers/gpu/drm/i915/gt/intel_gpu_commands.h @@ -144,6 +144,7 @@ #define MI_LOAD_REGISTER_IMM(x) MI_INSTR(0x22, 2*(x)-1) /* Gen11+. addr = base + (ctx_restore ? offset & GENMASK(12,2) : offset) */ #define MI_LRI_LRM_CS_MMIO REG_BIT(19) +#define MI_LRI_MMIO_REMAP_EN REG_BIT(17) #define MI_LRI_FORCE_POSTED (1<<12) #define MI_LOAD_REGISTER_IMM_MAX_REGS (126) #define MI_STORE_REGISTER_MEM MI_INSTR(0x24, 1) diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 07bef7128fdb..dffef6ab4baf 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -1208,6 +1208,10 @@ gen12_emit_indirect_ctx_rcs(const struct intel_context *ce, u32 *cs) IS_DG2_G11(ce->engine->i915)) cs = gen8_emit_pipe_control(cs, PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE, 0); + /* hsdes: 1809175790 */ + if (!HAS_FLAT_CCS(ce->engine->i915)) + cs = gen12_emit_aux_table_inv(cs, GEN12_GFX_CCS_AUX_NV); + return cs; } @@ -1225,6 +1229,14 @@ gen12_emit_indirect_ctx_xcs(const struct intel_context *ce, u32 *cs) PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE, 0); + /* hsdes: 1809175790 */ + if (!HAS_FLAT_CCS(ce->engine->i915)) { + if (ce->engine->class == VIDEO_DECODE_CLASS) + cs = gen12_emit_aux_table_inv(cs, GEN12_VD0_AUX_NV); + else if (ce->engine->class == VIDEO_ENHANCEMENT_CLASS) + cs = gen12_emit_aux_table_inv(cs, GEN12_VE0_AUX_NV); + } + return cs; }