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 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 50CEDC3ABD8 for ; Wed, 14 May 2025 17:56:55 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B9AC210E6E9; Wed, 14 May 2025 17:56:54 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="e3OBXXAF"; dkim-atps=neutral Received: from mail-pf1-f180.google.com (mail-pf1-f180.google.com [209.85.210.180]) by gabe.freedesktop.org (Postfix) with ESMTPS id 70A6B10E6E6; Wed, 14 May 2025 17:56:51 +0000 (UTC) Received: by mail-pf1-f180.google.com with SMTP id d2e1a72fcca58-7370a2d1981so144218b3a.2; Wed, 14 May 2025 10:56:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1747245410; x=1747850210; darn=lists.freedesktop.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=fWkauZa0yTaU6HfxOZ8XJDlmt6hXzhE6mALpbUTIEAY=; b=e3OBXXAFYd1uIGOhLMnleCb4l1MKWho5Xa/ohq1A8VZMg9lVdbK7zM05U3w5rtTyLp 870L9ID+5neVD3pZT2Zg55owU/CS6kuiG1Kkfqd6taXx6vLYDDcqP5tnPpiTfuh98b9Z UnV+bBA/HE6baoFSfWOhSv58rs34glE2Gea3siZcQzufciNCv4Gh0B9xeMHp3Sv5tx4c 8wEVQ/Ijk024hW6GaTLM98tTe/4LeRc9KZ0sjowoKtjhq4BmhNpkZFPl3kf2/IA1dyXd hfJK3hqrdFa7WQtdPy5VOUD0Kw5pinCxNE+40x7sK1mEMjDC4l8Za7xyn8OpkK5ZH1Bq yIyA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747245410; x=1747850210; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=fWkauZa0yTaU6HfxOZ8XJDlmt6hXzhE6mALpbUTIEAY=; b=qIdGUMXT2GUJpkSHe+QKbnkweuXBHyLW0K7YiZ5X0XkZs9KtzeLRVFqiroAuMtTAeP e2mAhP0CSlFrsCd6B3IOicCAuHKeY21xOdyhKvdei8+4I1bURR/v+6i6KKjDud92vNPb goe6lKvjME377a8Hr5668/NB5yifCjYrkk8UXYGE8RPeBS1nJ1GIjZfDYJgPeOWe/AR8 NvTSCDZ15XXSTG4uIZ2zOgeVP6liQuHjpN430y3YEbQH83hgZuHrzz6kyjJydPgrRpjL l+vcdO+U3HnVxErYcsfe0Hj1NyFwnyLbTQUTej8glctDz/6Sp27GK0dJFYlpxlLLMHTv 6qWg== X-Gm-Message-State: AOJu0YyGoks6Jpf+BGInRxq3zZofLR70vIzGtRPd2CtbzOZkal4o4DVE UqcND6MmRtBnkVaS9nDg3u1EVPWq3d3OYxdfhFlutSpp3RZecoMGoNxxFg== X-Gm-Gg: ASbGncsnmVVz6SJLCtmqIRv3uHGOyX4nnQxtEUGoBfrspFZNeuw1X1UCLiUpUOv55UL MGOf/u8E0XTBdsc+Ir4ZMDKNVl9H2pvMpvaV5eqrThljNLGpEXQB4+1BQvN75pcGj+xHdWm0XGd iHGqnyt14NQuMW9lNJltVtRauMjTTVsMOMwc+RwZNCk0NDxPe5SJcxH5YcWVEQycqC3LbAL3YA4 XtNrZMFecqpL+zRD4dHgh8B6tkaPyc+ZF4m3pBYApR42R+oG1zE4/YV5GBUwC/PAVPMubdjsbzo D2RjSQ4r0CTHsT1VkgqMuI6JJlAfFPtVDth/2aOnQku93JK26yx+qzvvIVPTmIszeVRDybdA34D Etzq/fjBX8+g0S7+K+vOZSpVUsw== X-Google-Smtp-Source: AGHT+IGw58UcStoMDWOLIc01lei+Ym3UYyZG0gMho76u6foKAmas5KwkCAyeoNqXGpYYUrzssVWekw== X-Received: by 2002:a05:6a00:2d88:b0:736:8c0f:7758 with SMTP id d2e1a72fcca58-74289290317mr5425329b3a.10.1747245410495; Wed, 14 May 2025 10:56:50 -0700 (PDT) Received: from localhost ([2a00:79e0:3e00:2601:3afc:446b:f0df:eadc]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-74237a10867sm9855080b3a.110.2025.05.14.10.56.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 14 May 2025 10:56:49 -0700 (PDT) From: Rob Clark To: dri-devel@lists.freedesktop.org Cc: freedreno@lists.freedesktop.org, linux-arm-msm@vger.kernel.org, Connor Abbott , Rob Clark , Rob Clark , Sean Paul , Konrad Dybcio , Abhinav Kumar , Dmitry Baryshkov , Marijn Suijten , David Airlie , Simona Vetter , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , linux-kernel@vger.kernel.org (open list) Subject: [PATCH v4 18/40] drm/msm: Add PRR support Date: Wed, 14 May 2025 10:53:32 -0700 Message-ID: <20250514175527.42488-19-robdclark@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250514175527.42488-1-robdclark@gmail.com> References: <20250514175527.42488-1-robdclark@gmail.com> 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: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" From: Rob Clark Add PRR (Partial Resident Region) is a bypass address which make GPU writes go to /dev/null and reads return zero. This is used to implement vulkan sparse residency. To support PRR/NULL mappings, we allocate a page to reserve a physical address which we know will not be used as part of a GEM object, and configure the SMMU to use this address for PRR/NULL mappings. Signed-off-by: Rob Clark --- drivers/gpu/drm/msm/adreno/adreno_gpu.c | 10 ++++ drivers/gpu/drm/msm/msm_iommu.c | 62 ++++++++++++++++++++++++- include/uapi/drm/msm_drm.h | 2 + 3 files changed, 73 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c index b3888a6ac001..cb4ee277721d 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c @@ -361,6 +361,13 @@ int adreno_fault_handler(struct msm_gpu *gpu, unsigned long iova, int flags, return 0; } +static bool +adreno_smmu_has_prr(struct msm_gpu *gpu) +{ + struct adreno_smmu_priv *adreno_smmu = dev_get_drvdata(&gpu->pdev->dev); + return adreno_smmu && adreno_smmu->set_prr_addr; +} + int adreno_get_param(struct msm_gpu *gpu, struct msm_context *ctx, uint32_t param, uint64_t *value, uint32_t *len) { @@ -444,6 +451,9 @@ int adreno_get_param(struct msm_gpu *gpu, struct msm_context *ctx, case MSM_PARAM_UCHE_TRAP_BASE: *value = adreno_gpu->uche_trap_base; return 0; + case MSM_PARAM_HAS_PRR: + *value = adreno_smmu_has_prr(gpu); + return 0; default: return UERR(EINVAL, drm, "%s: invalid param: %u", gpu->name, param); } diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c index 2fd48e66bc98..756bd55ee94f 100644 --- a/drivers/gpu/drm/msm/msm_iommu.c +++ b/drivers/gpu/drm/msm/msm_iommu.c @@ -13,6 +13,7 @@ struct msm_iommu { struct msm_mmu base; struct iommu_domain *domain; atomic_t pagetables; + struct page *prr_page; }; #define to_msm_iommu(x) container_of(x, struct msm_iommu, base) @@ -112,6 +113,36 @@ static int msm_iommu_pagetable_unmap(struct msm_mmu *mmu, u64 iova, return (size == 0) ? 0 : -EINVAL; } +static int msm_iommu_pagetable_map_prr(struct msm_mmu *mmu, u64 iova, size_t len, int prot) +{ + struct msm_iommu_pagetable *pagetable = to_pagetable(mmu); + struct io_pgtable_ops *ops = pagetable->pgtbl_ops; + struct msm_iommu *iommu = to_msm_iommu(pagetable->parent); + phys_addr_t phys = page_to_phys(iommu->prr_page); + u64 addr = iova; + + while (len) { + size_t mapped = 0; + size_t size = PAGE_SIZE; + int ret; + + ret = ops->map_pages(ops, addr, phys, size, 1, prot, GFP_KERNEL, &mapped); + + /* map_pages could fail after mapping some of the pages, + * so update the counters before error handling. + */ + addr += mapped; + len -= mapped; + + if (ret) { + msm_iommu_pagetable_unmap(mmu, iova, addr - iova); + return -EINVAL; + } + } + + return 0; +} + static int msm_iommu_pagetable_map(struct msm_mmu *mmu, u64 iova, struct sg_table *sgt, size_t off, size_t len, int prot) @@ -122,6 +153,9 @@ static int msm_iommu_pagetable_map(struct msm_mmu *mmu, u64 iova, u64 addr = iova; unsigned int i; + if (!sgt) + return msm_iommu_pagetable_map_prr(mmu, iova, len, prot); + for_each_sgtable_sg(sgt, sg, i) { size_t size = sg->length; phys_addr_t phys = sg_phys(sg); @@ -177,9 +211,16 @@ static void msm_iommu_pagetable_destroy(struct msm_mmu *mmu) * If this is the last attached pagetable for the parent, * disable TTBR0 in the arm-smmu driver */ - if (atomic_dec_return(&iommu->pagetables) == 0) + if (atomic_dec_return(&iommu->pagetables) == 0) { adreno_smmu->set_ttbr0_cfg(adreno_smmu->cookie, NULL); + if (adreno_smmu->set_prr_bit) { + adreno_smmu->set_prr_bit(adreno_smmu->cookie, false); + __free_page(iommu->prr_page); + iommu->prr_page = NULL; + } + } + free_io_pgtable_ops(pagetable->pgtbl_ops); kfree(pagetable); } @@ -336,6 +377,25 @@ struct msm_mmu *msm_iommu_pagetable_create(struct msm_mmu *parent) kfree(pagetable); return ERR_PTR(ret); } + + BUG_ON(iommu->prr_page); + if (adreno_smmu->set_prr_bit) { + /* + * We need a zero'd page for two reasons: + * + * 1) Reserve a known physical address to use when + * mapping NULL / sparsely resident regions + * 2) Read back zero + * + * It appears the hw drops writes to the PRR region + * on the floor, but reads actually return whatever + * is in the PRR page. + */ + iommu->prr_page = alloc_page(GFP_KERNEL | __GFP_ZERO); + adreno_smmu->set_prr_addr(adreno_smmu->cookie, + page_to_phys(iommu->prr_page)); + adreno_smmu->set_prr_bit(adreno_smmu->cookie, true); + } } /* Needed later for TLB flush */ diff --git a/include/uapi/drm/msm_drm.h b/include/uapi/drm/msm_drm.h index 2342cb90857e..5bc5e4526ccf 100644 --- a/include/uapi/drm/msm_drm.h +++ b/include/uapi/drm/msm_drm.h @@ -91,6 +91,8 @@ struct drm_msm_timespec { #define MSM_PARAM_UBWC_SWIZZLE 0x12 /* RO */ #define MSM_PARAM_MACROTILE_MODE 0x13 /* RO */ #define MSM_PARAM_UCHE_TRAP_BASE 0x14 /* RO */ +/* PRR (Partially Resident Region) is required for sparse residency: */ +#define MSM_PARAM_HAS_PRR 0x15 /* RO */ /* For backwards compat. The original support for preemption was based on * a single ring per priority level so # of priority levels equals the # -- 2.49.0