[RFC PATCH v3 05/10] iommu/riscv: support GSCID and GVMA invalidation command

[fangyu.yu@linux.alibaba.com]

From: Zong Li <zong.li@sifive.com>

This patch adds a ID Allocator for GSCID and a wrap for setting up
GSCID in IOTLB invalidation command.

Set up iohgatp to enable second stage table and flush stage-2 table if
the GSCID is set.

The GSCID of domain should be freed when release domain. GSCID will be
allocated for parent domain in nested IOMMU process.

Signed-off-by: Zong Li <zong.li@sifive.com>
Signed-off-by: Fangyu Yu <fangyu.yu@linux.alibaba.com>
---
 drivers/iommu/riscv/iommu-bits.h |  7 ++++
 drivers/iommu/riscv/iommu.c      | 62 ++++++++++++++++++++++++++------
 2 files changed, 58 insertions(+), 11 deletions(-)

diff --git a/drivers/iommu/riscv/iommu-bits.h b/drivers/iommu/riscv/iommu-bits.h
index f2ef9bd3cde9..65d1f2250011 100644
--- a/drivers/iommu/riscv/iommu-bits.h
+++ b/drivers/iommu/riscv/iommu-bits.h
@@ -720,6 +720,13 @@ static inline void riscv_iommu_cmd_inval_vma(struct riscv_iommu_command *cmd)
 	cmd->dword1 = 0;
 }
 
+static inline void riscv_iommu_cmd_inval_gvma(struct riscv_iommu_command *cmd)
+{
+	cmd->dword0 = FIELD_PREP(RISCV_IOMMU_CMD0_OPCODE, RISCV_IOMMU_CMD_IOTINVAL_OPCODE) |
+		      FIELD_PREP(RISCV_IOMMU_CMD0_FUNC, RISCV_IOMMU_CMD_IOTINVAL_FUNC_GVMA);
+	cmd->dword1 = 0;
+}
+
 static inline void riscv_iommu_cmd_inval_set_addr(struct riscv_iommu_command *cmd,
 						  u64 addr)
 {
diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c
index c5b6214ee672..99f05f1db35b 100644
--- a/drivers/iommu/riscv/iommu.c
+++ b/drivers/iommu/riscv/iommu.c
@@ -48,6 +48,10 @@
 static DEFINE_IDA(riscv_iommu_pscids);
 #define RISCV_IOMMU_MAX_PSCID		(BIT(20) - 1)
 
+/* IOMMU GSCID allocation namespace. */
+static DEFINE_IDA(riscv_iommu_gscids);
+#define RISCV_IOMMU_MAX_GSCID		(BIT(16) - 1)
+
 /* Device resource-managed allocations */
 struct riscv_iommu_devres {
 	void *addr;
@@ -819,6 +823,7 @@ struct riscv_iommu_domain {
 	struct list_head bonds;
 	spinlock_t lock;		/* protect bonds list updates. */
 	int pscid;
+	int gscid;
 };
 PT_IOMMU_CHECK_DOMAIN(struct riscv_iommu_domain, riscvpt.iommu, domain);
 
@@ -981,7 +986,7 @@ static void riscv_iommu_tlbi_calc(struct riscv_iommu_tlbi *tlbi,
 }
 
 static void riscv_iommu_iotlb_inval_iommu(struct riscv_iommu_device *iommu,
-					  int pscid,
+					  int pscid, int gscid,
 					  struct riscv_iommu_tlbi *tlbi)
 {
 	bool use_nl = tlbi->non_leaf &&
@@ -989,8 +994,13 @@ static void riscv_iommu_iotlb_inval_iommu(struct riscv_iommu_device *iommu,
 	struct riscv_iommu_command cmd;
 	unsigned int i;
 
-	riscv_iommu_cmd_inval_vma(&cmd);
-	riscv_iommu_cmd_inval_set_pscid(&cmd, pscid);
+	if (gscid) {
+		riscv_iommu_cmd_inval_gvma(&cmd);
+		riscv_iommu_cmd_inval_set_gscid(&cmd, gscid);
+	} else {
+		riscv_iommu_cmd_inval_vma(&cmd);
+		riscv_iommu_cmd_inval_set_pscid(&cmd, pscid);
+	}
 
 	/*
 	 * If non-leaf entries were changed and the IOMMU doesn't
@@ -1074,7 +1084,7 @@ static void riscv_iommu_iotlb_inval(struct riscv_iommu_domain *domain,
 		if (iommu == prev)
 			continue;
 
-		riscv_iommu_iotlb_inval_iommu(iommu, domain->pscid, &tlbi);
+		riscv_iommu_iotlb_inval_iommu(iommu, domain->pscid, domain->gscid, &tlbi);
 		prev = iommu;
 	}
 
@@ -1208,6 +1218,7 @@ static void riscv_iommu_iodir_update(struct riscv_iommu_device *iommu,
 
 		WRITE_ONCE(dc->fsc, new_dc->fsc);
 		WRITE_ONCE(dc->ta, new_dc->ta & RISCV_IOMMU_PC_TA_PSCID);
+		WRITE_ONCE(dc->iohgatp, new_dc->iohgatp);
 		/* Update device context, write TC.V as the last step. */
 		dma_wmb();
 		WRITE_ONCE(dc->tc, tc);
@@ -1258,16 +1269,19 @@ static void riscv_iommu_free_paging_domain(struct iommu_domain *iommu_domain)
 
 	WARN_ON(!list_empty(&domain->bonds));
 
-	if ((int)domain->pscid > 0)
+	if (domain->pscid > 0)
 		ida_free(&riscv_iommu_pscids, domain->pscid);
+	if (domain->gscid > 0)
+		ida_free(&riscv_iommu_gscids, domain->gscid);
 
 	pt_iommu_deinit(&domain->riscvpt.iommu);
 	kfree(domain);
 }
 
-static bool riscv_iommu_pt_supported(struct riscv_iommu_device *iommu, int pgd_mode)
+static bool riscv_iommu_fsc_supported(struct riscv_iommu_device *iommu,
+				      int mode)
 {
-	switch (pgd_mode) {
+	switch (mode) {
 	case RISCV_IOMMU_DC_FSC_IOSATP_MODE_SV39:
 		return iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39;
 
@@ -1280,6 +1294,22 @@ static bool riscv_iommu_pt_supported(struct riscv_iommu_device *iommu, int pgd_m
 	return false;
 }
 
+static bool riscv_iommu_iohgatp_supported(struct riscv_iommu_device *iommu,
+					  int mode)
+{
+	switch (mode) {
+	case RISCV_IOMMU_DC_IOHGATP_MODE_SV39X4:
+		return iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39X4;
+
+	case RISCV_IOMMU_DC_IOHGATP_MODE_SV48X4:
+		return iommu->caps & RISCV_IOMMU_CAPABILITIES_SV48X4;
+
+	case RISCV_IOMMU_DC_IOHGATP_MODE_SV57X4:
+		return iommu->caps & RISCV_IOMMU_CAPABILITIES_SV57X4;
+	}
+	return false;
+}
+
 static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain,
 					    struct device *dev,
 					    struct iommu_domain *old)
@@ -1292,11 +1322,21 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain,
 
 	pt_iommu_riscv_64_hw_info(&domain->riscvpt, &pt_info);
 
-	if (!riscv_iommu_pt_supported(iommu, pt_info.fsc_iosatp_mode))
-		return -ENODEV;
+	if (domain->gscid) {
+		if (!riscv_iommu_iohgatp_supported(iommu, pt_info.iohgatp_mode))
+			return -ENODEV;
+
+		dc.iohgatp =
+			FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_MODE, pt_info.iohgatp_mode) |
+			FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_GSCID, domain->gscid) |
+			FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_PPN, pt_info.ppn);
+	} else {
+		if (!riscv_iommu_fsc_supported(iommu, pt_info.fsc_iosatp_mode))
+			return -ENODEV;
 
-	dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) |
-	      FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn);
+		dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) |
+			 FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn);
+	}
 	dc.ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) |
 	     RISCV_IOMMU_PC_TA_V;
 
-- 
2.50.1


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