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From: Rob Clark <robdclark@gmail.com>
To: iommu@lists.linux-foundation.org,
	dri-devel@lists.freedesktop.org, Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Joerg Roedel <joro@8bytes.org>
Cc: linux-arm-msm@vger.kernel.org, freedreno@lists.freedesktop.org,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Sibi Sankar <sibis@codeaurora.org>,
	Vivek Gautam <vivek.gautam@codeaurora.org>,
	Stephen Boyd <swboyd@chromium.org>,
	Akhil P Oommen <akhilpo@codeaurora.org>,
	Rob Clark <robdclark@chromium.org>,
	Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>,
	Jordan Crouse <jcrouse@codeaurora.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thierry Reding <treding@nvidia.com>,
	Krishna Reddy <vdumpa@nvidia.com>,
	linux-arm-kernel@lists.infradead.org (moderated list:ARM SMMU
	DRIVERS), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v17 17/20] iommu/arm-smmu: Add a way for implementations to influence SCTLR
Date: Sat,  5 Sep 2020 13:04:23 -0700	[thread overview]
Message-ID: <20200905200454.240929-18-robdclark@gmail.com> (raw)
In-Reply-To: <20200905200454.240929-1-robdclark@gmail.com>

From: Rob Clark <robdclark@chromium.org>

For the Adreno GPU's SMMU, we want SCTLR.HUPCF set to ensure that
pending translations are not terminated on iova fault.  Otherwise
a terminated CP read could hang the GPU by returning invalid
command-stream data.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 6 ++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.c      | 3 +++
 drivers/iommu/arm/arm-smmu/arm-smmu.h      | 3 +++
 3 files changed, 12 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 1e942eed2dfc..0663d7d26908 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -129,6 +129,12 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
 	    (smmu_domain->cfg.fmt == ARM_SMMU_CTX_FMT_AARCH64))
 		pgtbl_cfg->quirks |= IO_PGTABLE_QUIRK_ARM_TTBR1;
 
+	/*
+	 * On the GPU device we want to process subsequent transactions after a
+	 * fault to keep the GPU from hanging
+	 */
+	smmu_domain->cfg.sctlr_set |= ARM_SMMU_SCTLR_HUPCF;
+
 	/*
 	 * Initialize private interface with GPU:
 	 */
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index dad7fa86fbd4..1f06ab219819 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -617,6 +617,9 @@ void arm_smmu_write_context_bank(struct arm_smmu_device *smmu, int idx)
 	if (IS_ENABLED(CONFIG_CPU_BIG_ENDIAN))
 		reg |= ARM_SMMU_SCTLR_E;
 
+	reg |= cfg->sctlr_set;
+	reg &= ~cfg->sctlr_clr;
+
 	arm_smmu_cb_write(smmu, idx, ARM_SMMU_CB_SCTLR, reg);
 }
 
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index 6c5ff9999eae..ddf2ca4c923d 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -144,6 +144,7 @@ enum arm_smmu_cbar_type {
 #define ARM_SMMU_CB_SCTLR		0x0
 #define ARM_SMMU_SCTLR_S1_ASIDPNE	BIT(12)
 #define ARM_SMMU_SCTLR_CFCFG		BIT(7)
+#define ARM_SMMU_SCTLR_HUPCF		BIT(8)
 #define ARM_SMMU_SCTLR_CFIE		BIT(6)
 #define ARM_SMMU_SCTLR_CFRE		BIT(5)
 #define ARM_SMMU_SCTLR_E		BIT(4)
@@ -341,6 +342,8 @@ struct arm_smmu_cfg {
 		u16			asid;
 		u16			vmid;
 	};
+	u32				sctlr_set;    /* extra bits to set in SCTLR */
+	u32				sctlr_clr;    /* bits to mask in SCTLR */
 	enum arm_smmu_cbar_type		cbar;
 	enum arm_smmu_context_fmt	fmt;
 };
-- 
2.26.2


  parent reply	other threads:[~2020-09-05 20:05 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-05 20:04 [PATCH v17 00/20] iommu/arm-smmu + drm/msm: per-process GPU pgtables Rob Clark
2020-09-05 20:04 ` [PATCH v17 01/20] drm/msm: Remove dangling submitqueue references Rob Clark
2020-09-05 20:04 ` [PATCH v17 02/20] drm/msm: Add private interface for adreno-smmu Rob Clark
2020-09-05 20:04 ` [PATCH v17 03/20] drm/msm/gpu: Add dev_to_gpu() helper Rob Clark
2020-09-05 20:04 ` [PATCH v17 04/20] drm/msm: Set adreno_smmu as gpu's drvdata Rob Clark
2020-09-05 20:04 ` [PATCH v17 05/20] drm/msm: Add a context pointer to the submitqueue Rob Clark
2020-09-05 20:04 ` [PATCH v17 06/20] drm/msm: Drop context arg to gpu->submit() Rob Clark
2020-09-05 20:04 ` [PATCH v17 07/20] drm/msm: Set the global virtual address range from the IOMMU domain Rob Clark
2020-09-05 20:04 ` [PATCH v17 08/20] drm/msm: Add support to create a local pagetable Rob Clark
2020-09-05 20:04 ` [PATCH v17 09/20] drm/msm: Add support for private address space instances Rob Clark
2020-09-05 20:04 ` [PATCH v17 10/20] drm/msm/a6xx: Add support for per-instance pagetables Rob Clark
2020-09-05 20:04 ` [PATCH v17 11/20] drm/msm: Show process names in gem_describe Rob Clark
2020-09-05 20:04 ` [PATCH v17 12/20] iommu/arm-smmu: Pass io-pgtable config to implementation specific function Rob Clark
2020-09-05 20:04 ` [PATCH v17 13/20] iommu/arm-smmu: Add support for split pagetables Rob Clark
2020-09-05 20:04 ` [PATCH v17 14/20] iommu/arm-smmu: Prepare for the adreno-smmu implementation Rob Clark
2020-09-05 20:04 ` [PATCH v17 15/20] iommu/arm-smmu: Constify some helpers Rob Clark
2020-09-05 20:04 ` [PATCH v17 16/20] iommu/arm-smmu-qcom: Add implementation for the adreno GPU SMMU Rob Clark
2020-09-05 20:04 ` Rob Clark [this message]
2020-09-05 20:04 ` [PATCH v17 18/20] dt-bindings: arm-smmu: Add compatible string for Adreno " Rob Clark
2020-09-05 20:04 ` [PATCH v17 19/20] arm: dts: qcom: sm845: Set the compatible string for the " Rob Clark
2020-09-05 20:04 ` [PATCH v17 20/20] arm: dts: qcom: sc7180: " Rob Clark
2020-09-21 21:30 ` [PATCH v17 00/20] iommu/arm-smmu + drm/msm: per-process GPU pgtables Will Deacon
2020-09-22  1:27   ` Rob Clark
2020-09-22  2:53   ` Jordan Crouse

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