linux-kernel - [RFC PATCH 3/4] drm/msm/iommu: introduce msm_iommu_disp_new() for msm

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Date: Fri, 17 May 2024 16:37:58 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: <freedreno@...ts.freedesktop.org>, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Daniel
 Vetter" <daniel@...ll.ch>
CC: <dri-devel@...ts.freedesktop.org>, <seanpaul@...omium.org>,
        <swboyd@...omium.org>, <dianders@...omium.org>,
        <quic_jesszhan@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 3/4] drm/msm/iommu: introduce msm_iommu_disp_new() for msm_kms

Introduce a new API msm_iommu_disp_new() for display use-cases.

Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/msm_iommu.c | 28 ++++++++++++++++++++++++++++
 drivers/gpu/drm/msm/msm_mmu.h   |  1 +
 2 files changed, 29 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_iommu.c b/drivers/gpu/drm/msm/msm_iommu.c
index a79cd18bc4c9..3d5c1bb4c013 100644
--- a/drivers/gpu/drm/msm/msm_iommu.c
+++ b/drivers/gpu/drm/msm/msm_iommu.c
@@ -343,6 +343,19 @@ static int msm_gpu_fault_handler(struct iommu_domain *domain, struct device *dev
 	return 0;
 }
 
+static int msm_disp_fault_handler(struct iommu_domain *domain, struct device *dev,
+				  unsigned long iova, int flags, void *arg)
+{
+	struct msm_iommu *iommu = arg;
+
+	if (iommu->base.handler)
+		return iommu->base.handler(iommu->base.arg, iova, flags, NULL);
+
+	pr_warn_ratelimited("*** fault: iova=%16lx, flags=%d\n", iova, flags);
+
+	return 0;
+}
+
 static void msm_iommu_resume_translation(struct msm_mmu *mmu)
 {
 	struct adreno_smmu_priv *adreno_smmu = dev_get_drvdata(mmu->dev);
@@ -434,6 +447,21 @@ struct msm_mmu *msm_iommu_new(struct device *dev, unsigned long quirks)
 	return &iommu->base;
 }
 
+struct msm_mmu *msm_iommu_disp_new(struct device *dev, unsigned long quirks)
+{
+	struct msm_iommu *iommu;
+	struct msm_mmu *mmu;
+
+	mmu = msm_iommu_new(dev, quirks);
+	if (IS_ERR_OR_NULL(mmu))
+		return mmu;
+
+	iommu = to_msm_iommu(mmu);
+	iommu_set_fault_handler(iommu->domain, msm_disp_fault_handler, iommu);
+
+	return mmu;
+}
+
 struct msm_mmu *msm_iommu_gpu_new(struct device *dev, struct msm_gpu *gpu, unsigned long quirks)
 {
 	struct adreno_smmu_priv *adreno_smmu = dev_get_drvdata(dev);
diff --git a/drivers/gpu/drm/msm/msm_mmu.h b/drivers/gpu/drm/msm/msm_mmu.h
index 88af4f490881..730458d08d6b 100644
--- a/drivers/gpu/drm/msm/msm_mmu.h
+++ b/drivers/gpu/drm/msm/msm_mmu.h
@@ -42,6 +42,7 @@ static inline void msm_mmu_init(struct msm_mmu *mmu, struct device *dev,
 
 struct msm_mmu *msm_iommu_new(struct device *dev, unsigned long quirks);
 struct msm_mmu *msm_iommu_gpu_new(struct device *dev, struct msm_gpu *gpu, unsigned long quirks);
+struct msm_mmu *msm_iommu_disp_new(struct device *dev, unsigned long quirks);
 
 static inline void msm_mmu_set_fault_handler(struct msm_mmu *mmu, void *arg,
 		int (*handler)(void *arg, unsigned long iova, int flags, void *data))
-- 
2.44.0