linux-kernel - [PATCH v11 6/6] iommu/arm-smmu: add support for PRR bit setup

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Date: Wed, 5 Jun 2024 17:47:13 +0530
From: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
To: <robdclark@...il.com>, <will@...nel.org>, <robin.murphy@....com>,
        <joro@...tes.org>, <jgg@...pe.ca>, <jsnitsel@...hat.com>,
        <robh@...nel.org>, <krzysztof.kozlowski@...aro.org>,
        <quic_c_gdjako@...cinc.com>, <dmitry.baryshkov@...aro.org>,
        <konrad.dybcio@...aro.org>
CC: <iommu@...ts.linux.dev>, <linux-arm-msm@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        "Bibek Kumar Patro" <quic_bibekkum@...cinc.com>
Subject: [PATCH v11 6/6] iommu/arm-smmu: add support for PRR bit setup

Add an adreno-smmu-priv interface for drm/msm to call
into arm-smmu-qcom and initiate the PRR bit setup or reset
sequence as per request.

This will be used by GPU side to setup the PRR bit and
related configuration registers through adreno-smmu private
interface instead of directly poking the smmu hardware.

Signed-off-by: Bibek Kumar Patro <quic_bibekkum@...cinc.com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 21 +++++++++++++++++++++
 drivers/iommu/arm/arm-smmu/arm-smmu.h      |  2 ++
 include/linux/adreno-smmu-priv.h           |  5 ++++-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 8dabc26fa10e..2f4ee22f740a 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -28,6 +28,7 @@
 #define PREFETCH_SHALLOW	(1 << PREFETCH_SHIFT)
 #define PREFETCH_MODERATE	(2 << PREFETCH_SHIFT)
 #define PREFETCH_DEEP		(3 << PREFETCH_SHIFT)
+#define GFX_ACTLR_PRR		(1 << 5)

 static const struct actlr_config sc7280_apps_actlr_cfg[] = {
 	{ 0x0800, 0x24e1, PREFETCH_DEFAULT | CMTLB },
@@ -212,6 +213,25 @@ static void qcom_adreno_smmu_resume_translation(const void *cookie, bool termina
 	arm_smmu_cb_write(smmu, cfg->cbndx, ARM_SMMU_CB_RESUME, reg);
 }

+static void qcom_adreno_smmu_set_actlr_bit(const void *cookie, phys_addr_t page_addr, bool set)
+{
+	struct arm_smmu_domain *smmu_domain = (void *)cookie;
+	struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
+	u32 reg = 0;
+
+	writel_relaxed(lower_32_bits(page_addr),
+				(void *)smmu->ioaddr + ARM_SMMU_GFX_PRR_CFG_LADDR);
+
+	writel_relaxed(upper_32_bits(page_addr),
+				(void *)smmu->ioaddr + ARM_SMMU_GFX_PRR_CFG_UADDR);
+
+	reg =  arm_smmu_cb_read(smmu, cfg->cbndx, ARM_SMMU_CB_ACTLR);
+	reg |= FIELD_PREP(GFX_ACTLR_PRR, set ? 1 : 0);
+	arm_smmu_cb_write(smmu, cfg->cbndx, ARM_SMMU_CB_ACTLR, reg);
+
+}
+
 #define QCOM_ADRENO_SMMU_GPU_SID 0

 static bool qcom_adreno_smmu_is_gpu_device(struct device *dev)
@@ -384,6 +404,7 @@ static int qcom_adreno_smmu_init_context(struct arm_smmu_domain *smmu_domain,
 	priv->get_fault_info = qcom_adreno_smmu_get_fault_info;
 	priv->set_stall = qcom_adreno_smmu_set_stall;
 	priv->resume_translation = qcom_adreno_smmu_resume_translation;
+	priv->set_actlr_bit = qcom_adreno_smmu_set_actlr_bit;

 	actlrvar = qsmmu->data->actlrvar;
 	if (!actlrvar)
diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.h b/drivers/iommu/arm/arm-smmu/arm-smmu.h
index d9c2ef8c1653..3076bef49e20 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.h
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.h
@@ -154,6 +154,8 @@ enum arm_smmu_cbar_type {
 #define ARM_SMMU_SCTLR_M		BIT(0)

 #define ARM_SMMU_CB_ACTLR		0x4
+#define ARM_SMMU_GFX_PRR_CFG_LADDR	0x6008
+#define ARM_SMMU_GFX_PRR_CFG_UADDR	0x600C

 #define ARM_SMMU_CB_RESUME		0x8
 #define ARM_SMMU_RESUME_TERMINATE	BIT(0)
diff --git a/include/linux/adreno-smmu-priv.h b/include/linux/adreno-smmu-priv.h
index c637e0997f6d..448e191eeb52 100644
--- a/include/linux/adreno-smmu-priv.h
+++ b/include/linux/adreno-smmu-priv.h
@@ -49,7 +49,9 @@ struct adreno_smmu_fault_info {
  *                 before set_ttbr0_cfg().  If stalling on fault is enabled,
  *                 the GPU driver must call resume_translation()
  * @resume_translation: Resume translation after a fault
- *
+ * @set_actlr_bits: Extendible interface to be used  by GPU to modify the
+ *		    ACTLR bits, currently used to intitate PRR bit setup or
+ *		    reset sequence for ACTLR registers as requested.
  *
  * The GPU driver (drm/msm) and adreno-smmu work together for controlling
  * the GPU's SMMU instance.  This is by necessity, as the GPU is directly
@@ -67,6 +69,7 @@ struct adreno_smmu_priv {
     void (*get_fault_info)(const void *cookie, struct adreno_smmu_fault_info *info);
     void (*set_stall)(const void *cookie, bool enabled);
     void (*resume_translation)(const void *cookie, bool terminate);
+    void (*set_actlr_bit)(const void *cookie, phys_addr_t page_addr, bool set);
 };

 #endif /* __ADRENO_SMMU_PRIV_H */
--
2.34.1