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From: Robin Murphy <robin.murphy@arm.com>
To: will@kernel.org
Cc: bjorn.andersson@linaro.org, iommu@lists.linux-foundation.org,
	gregory.clement@bootlin.com,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 09/15] iommu/arm-smmu: Abstract GR0 accesses
Date: Fri,  9 Aug 2019 18:07:46 +0100
Message-ID: <8a412e49cf2114d4b3a6d3df9d9ada9b25b57ef3.1565369764.git.robin.murphy@arm.com> (raw)
In-Reply-To: <cover.1565369764.git.robin.murphy@arm.com>

Clean up the remaining accesses to GR0 registers, so that everything is
now neatly abstracted. This folds up the Non-Secure alias quirk as the
first step towards moving it out of the way entirely. Although GR0 does
technically contain some 64-bit registers (sGFAR and the weird SMMUv2
HYPC and MONC stuff), they're not ones we have any need to access.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/arm-smmu.c | 101 +++++++++++++++++++++------------------
 1 file changed, 54 insertions(+), 47 deletions(-)

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index abdcc3f52e2e..d1ba5d115713 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -69,19 +69,6 @@
 /* Maximum number of context banks per SMMU */
 #define ARM_SMMU_MAX_CBS		128
 
-/* SMMU global address space */
-#define ARM_SMMU_GR0(smmu)		((smmu)->base)
-
-/*
- * SMMU global address space with conditional offset to access secure
- * aliases of non-secure registers (e.g. nsCR0: 0x400, nsGFSR: 0x448,
- * nsGFSYNR0: 0x450)
- */
-#define ARM_SMMU_GR0_NS(smmu)						\
-	((smmu)->base +							\
-		((smmu->options & ARM_SMMU_OPT_SECURE_CFG_ACCESS)	\
-			? 0x400 : 0))
-
 #define MSI_IOVA_BASE			0x8000000
 #define MSI_IOVA_LENGTH			0x100000
 
@@ -246,6 +233,21 @@ struct arm_smmu_domain {
 	struct iommu_domain		domain;
 };
 
+static int arm_smmu_gr0_ns(int offset)
+{
+	switch(offset) {
+	case ARM_SMMU_GR0_sCR0:
+	case ARM_SMMU_GR0_sACR:
+	case ARM_SMMU_GR0_sGFSR:
+	case ARM_SMMU_GR0_sGFSYNR0:
+	case ARM_SMMU_GR0_sGFSYNR1:
+	case ARM_SMMU_GR0_sGFSYNR2:
+		return offset + 0x400;
+	default:
+		return offset;
+	}
+}
+
 static void __iomem *arm_smmu_page(struct arm_smmu_device *smmu, int n)
 {
 	return smmu->base + (n << smmu->pgshift);
@@ -253,12 +255,18 @@ static void __iomem *arm_smmu_page(struct arm_smmu_device *smmu, int n)
 
 static u32 arm_smmu_readl(struct arm_smmu_device *smmu, int page, int offset)
 {
+	if ((smmu->options & ARM_SMMU_OPT_SECURE_CFG_ACCESS) && page == 0)
+		offset = arm_smmu_gr0_ns(offset);
+
 	return readl_relaxed(arm_smmu_page(smmu, page) + offset);
 }
 
 static void arm_smmu_writel(struct arm_smmu_device *smmu, int page, int offset,
 			    u32 val)
 {
+	if ((smmu->options & ARM_SMMU_OPT_SECURE_CFG_ACCESS) && page == 0)
+		offset = arm_smmu_gr0_ns(offset);
+
 	writel_relaxed(val, arm_smmu_page(smmu, page) + offset);
 }
 
@@ -273,6 +281,9 @@ static void arm_smmu_writeq(struct arm_smmu_device *smmu, int page, int offset,
 	writeq_relaxed(val, arm_smmu_page(smmu, page) + offset);
 }
 
+#define arm_smmu_read_gr0(s, r)		arm_smmu_readl((s), 0, (r))
+#define arm_smmu_write_gr0(s, r, v)	arm_smmu_writel((s), 0, (r), (v))
+
 #define arm_smmu_read_gr1(s, r)		arm_smmu_readl((s), 1, (r))
 #define arm_smmu_write_gr1(s, r, v)	arm_smmu_writel((s), 1, (r), (v))
 
@@ -506,10 +517,10 @@ static void arm_smmu_tlb_inv_context_s2(void *cookie)
 {
 	struct arm_smmu_domain *smmu_domain = cookie;
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
-	void __iomem *base = ARM_SMMU_GR0(smmu);
 
-	/* NOTE: see above */
-	writel(smmu_domain->cfg.vmid, base + ARM_SMMU_GR0_TLBIVMID);
+	/* See above */
+	wmb();
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_TLBIVMID, smmu_domain->cfg.vmid);
 	arm_smmu_tlb_sync_global(smmu);
 }
 
@@ -574,12 +585,12 @@ static void arm_smmu_tlb_inv_vmid_nosync(unsigned long iova, size_t size,
 					 size_t granule, bool leaf, void *cookie)
 {
 	struct arm_smmu_domain *smmu_domain = cookie;
-	void __iomem *base = ARM_SMMU_GR0(smmu_domain->smmu);
+	struct arm_smmu_device *smmu = smmu_domain->smmu;
 
-	if (smmu_domain->smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
+	if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
 		wmb();
 
-	writel_relaxed(smmu_domain->cfg.vmid, base + ARM_SMMU_GR0_TLBIVMID);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_TLBIVMID, smmu_domain->cfg.vmid);
 }
 
 static const struct iommu_gather_ops arm_smmu_s1_tlb_ops = {
@@ -629,12 +640,11 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
 {
 	u32 gfsr, gfsynr0, gfsynr1, gfsynr2;
 	struct arm_smmu_device *smmu = dev;
-	void __iomem *gr0_base = ARM_SMMU_GR0_NS(smmu);
 
-	gfsr = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR);
-	gfsynr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR0);
-	gfsynr1 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR1);
-	gfsynr2 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR2);
+	gfsr = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sGFSR);
+	gfsynr0 = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sGFSYNR0);
+	gfsynr1 = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sGFSYNR1);
+	gfsynr2 = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sGFSYNR2);
 
 	if (!gfsr)
 		return IRQ_NONE;
@@ -645,7 +655,7 @@ static irqreturn_t arm_smmu_global_fault(int irq, void *dev)
 		"\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n",
 		gfsr, gfsynr0, gfsynr1, gfsynr2);
 
-	writel(gfsr, gr0_base + ARM_SMMU_GR0_sGFSR);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_sGFSR, gfsr);
 	return IRQ_HANDLED;
 }
 
@@ -1051,7 +1061,7 @@ static void arm_smmu_write_smr(struct arm_smmu_device *smmu, int idx)
 
 	if (!(smmu->features & ARM_SMMU_FEAT_EXIDS) && smr->valid)
 		reg |= SMR_VALID;
-	writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_SMR(idx));
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_SMR(idx), reg);
 }
 
 static void arm_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx)
@@ -1064,7 +1074,7 @@ static void arm_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx)
 	if (smmu->features & ARM_SMMU_FEAT_EXIDS && smmu->smrs &&
 	    smmu->smrs[idx].valid)
 		reg |= S2CR_EXIDVALID;
-	writel_relaxed(reg, ARM_SMMU_GR0(smmu) + ARM_SMMU_GR0_S2CR(idx));
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_S2CR(idx), reg);
 }
 
 static void arm_smmu_write_sme(struct arm_smmu_device *smmu, int idx)
@@ -1080,7 +1090,6 @@ static void arm_smmu_write_sme(struct arm_smmu_device *smmu, int idx)
  */
 static void arm_smmu_test_smr_masks(struct arm_smmu_device *smmu)
 {
-	void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
 	u32 smr;
 
 	if (!smmu->smrs)
@@ -1092,13 +1101,13 @@ static void arm_smmu_test_smr_masks(struct arm_smmu_device *smmu)
 	 * masters later if they try to claim IDs outside these masks.
 	 */
 	smr = FIELD_PREP(SMR_ID, smmu->streamid_mask);
-	writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
-	smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_SMR(0), smr);
+	smr = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_SMR(0));
 	smmu->streamid_mask = FIELD_GET(SMR_ID, smr);
 
 	smr = FIELD_PREP(SMR_MASK, smmu->streamid_mask);
-	writel_relaxed(smr, gr0_base + ARM_SMMU_GR0_SMR(0));
-	smr = readl_relaxed(gr0_base + ARM_SMMU_GR0_SMR(0));
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_SMR(0), smr);
+	smr = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_SMR(0));
 	smmu->smr_mask_mask = FIELD_GET(SMR_MASK, smr);
 }
 
@@ -1731,13 +1740,12 @@ static struct iommu_ops arm_smmu_ops = {
 
 static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 {
-	void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
 	int i;
 	u32 reg, major;
 
 	/* clear global FSR */
-	reg = readl_relaxed(ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
-	writel(reg, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sGFSR);
+	reg = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sGFSR);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_sGFSR, reg);
 
 	/*
 	 * Reset stream mapping groups: Initial values mark all SMRn as
@@ -1752,9 +1760,9 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 		 * clear CACHE_LOCK bit of ACR first. And, CACHE_LOCK
 		 * bit is only present in MMU-500r2 onwards.
 		 */
-		reg = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID7);
+		reg = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_ID7);
 		major = FIELD_GET(ID7_MAJOR, reg);
-		reg = readl_relaxed(gr0_base + ARM_SMMU_GR0_sACR);
+		reg = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sACR);
 		if (major >= 2)
 			reg &= ~ARM_MMU500_ACR_CACHE_LOCK;
 		/*
@@ -1762,7 +1770,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 		 * TLB entries for reduced latency.
 		 */
 		reg |= ARM_MMU500_ACR_SMTNMB_TLBEN | ARM_MMU500_ACR_S2CRB_TLBEN;
-		writel_relaxed(reg, gr0_base + ARM_SMMU_GR0_sACR);
+		arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_sACR, reg);
 	}
 
 	/* Make sure all context banks are disabled and clear CB_FSR  */
@@ -1781,10 +1789,10 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 	}
 
 	/* Invalidate the TLB, just in case */
-	writel_relaxed(QCOM_DUMMY_VAL, gr0_base + ARM_SMMU_GR0_TLBIALLH);
-	writel_relaxed(QCOM_DUMMY_VAL, gr0_base + ARM_SMMU_GR0_TLBIALLNSNH);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_TLBIALLH, QCOM_DUMMY_VAL);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_TLBIALLNSNH, QCOM_DUMMY_VAL);
 
-	reg = readl_relaxed(ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+	reg = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_sCR0);
 
 	/* Enable fault reporting */
 	reg |= (sCR0_GFRE | sCR0_GFIE | sCR0_GCFGFRE | sCR0_GCFGFIE);
@@ -1813,7 +1821,7 @@ static void arm_smmu_device_reset(struct arm_smmu_device *smmu)
 
 	/* Push the button */
 	arm_smmu_tlb_sync_global(smmu);
-	writel(reg, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_sCR0, reg);
 }
 
 static int arm_smmu_id_size_to_bits(int size)
@@ -1838,7 +1846,6 @@ static int arm_smmu_id_size_to_bits(int size)
 static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
 {
 	unsigned int size;
-	void __iomem *gr0_base = ARM_SMMU_GR0(smmu);
 	u32 id;
 	bool cttw_reg, cttw_fw = smmu->features & ARM_SMMU_FEAT_COHERENT_WALK;
 	int i;
@@ -1848,7 +1855,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
 			smmu->version == ARM_SMMU_V2 ? 2 : 1);
 
 	/* ID0 */
-	id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID0);
+	id = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_ID0);
 
 	/* Restrict available stages based on module parameter */
 	if (force_stage == 1)
@@ -1942,7 +1949,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
 	}
 
 	/* ID1 */
-	id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID1);
+	id = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_ID1);
 	smmu->pgshift = (id & ID1_PAGESIZE) ? 16 : 12;
 
 	/* Check for size mismatch of SMMU address space from mapped region */
@@ -1980,7 +1987,7 @@ static int arm_smmu_device_cfg_probe(struct arm_smmu_device *smmu)
 		return -ENOMEM;
 
 	/* ID2 */
-	id = readl_relaxed(gr0_base + ARM_SMMU_GR0_ID2);
+	id = arm_smmu_read_gr0(smmu, ARM_SMMU_GR0_ID2);
 	size = arm_smmu_id_size_to_bits(FIELD_GET(ID2_IAS, id));
 	smmu->ipa_size = size;
 
@@ -2364,7 +2371,7 @@ static void arm_smmu_device_shutdown(struct platform_device *pdev)
 
 	arm_smmu_rpm_get(smmu);
 	/* Turn the thing off */
-	writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
+	arm_smmu_write_gr0(smmu, ARM_SMMU_GR0_sCR0, sCR0_CLIENTPD);
 	arm_smmu_rpm_put(smmu);
 
 	if (pm_runtime_enabled(smmu->dev))
-- 
2.21.0.dirty

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  parent reply index

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 17:07 [PATCH 00/15] Arm SMMU refactoring Robin Murphy
2019-08-09 17:07 ` [PATCH 01/15] iommu/arm-smmu: Convert GR0 registers to bitfields Robin Murphy
2019-08-14 17:20   ` Will Deacon
2019-08-14 17:35     ` Robin Murphy
2019-08-09 17:07 ` [PATCH 02/15] iommu/arm-smmu: Convert GR1 " Robin Murphy
2019-08-09 17:07 ` [PATCH 03/15] iommu/arm-smmu: Convert context bank " Robin Murphy
2019-08-09 17:07 ` [PATCH 04/15] iommu/arm-smmu: Rework cb_base handling Robin Murphy
2019-08-14 18:05   ` Will Deacon
2019-08-15 11:14     ` Robin Murphy
2019-08-09 17:07 ` [PATCH 05/15] iommu/arm-smmu: Split arm_smmu_tlb_inv_range_nosync() Robin Murphy
2019-08-15 10:56   ` Will Deacon
2019-08-15 11:22     ` Robin Murphy
2019-08-09 17:07 ` [PATCH 06/15] iommu/arm-smmu: Get rid of weird "atomic" write Robin Murphy
2019-08-09 17:07 ` [PATCH 07/15] iommu/arm-smmu: Abstract GR1 accesses Robin Murphy
2019-08-09 17:07 ` [PATCH 08/15] iommu/arm-smmu: Abstract context bank accesses Robin Murphy
2019-08-15 10:56   ` Will Deacon
2019-08-15 11:41     ` Robin Murphy
2019-08-09 17:07 ` Robin Murphy [this message]
2019-08-09 17:07 ` [PATCH 10/15] iommu/arm-smmu: Rename arm-smmu-regs.h Robin Murphy
2019-08-09 17:07 ` [PATCH 11/15] iommu/arm-smmu: Add implementation infrastructure Robin Murphy
2019-08-09 17:07 ` [PATCH 12/15] iommu/arm-smmu: Move Secure access quirk to implementation Robin Murphy
2019-08-09 17:07 ` [PATCH 13/15] iommu/arm-smmu: Add configuration implementation hook Robin Murphy
2019-08-09 17:07 ` [PATCH 14/15] iommu/arm-smmu: Add reset " Robin Murphy
2019-08-09 17:07 ` [PATCH 15/15] iommu/arm-smmu: Add context init " Robin Murphy
2019-08-13 19:11   ` Krishna Reddy
2019-08-15 10:56   ` Will Deacon
2019-08-15 12:09     ` Robin Murphy
2019-08-15 15:09       ` Jordan Crouse
2019-08-09 17:11 ` [PATCH 00/15] Arm SMMU refactoring Robin Murphy
2019-08-15 10:55 ` Will Deacon

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