iommu/vt-d: Remove unused vcmd interfaces

Commit 99b5726 ("iommu: Remove ioasid infrastructure") has removed
ioasid allocation interfaces from the iommu subsystem. As a result, these
vcmd interfaces have become obsolete. Remove them to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20231116015048.29675-4-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: LuBaolu

drivers/iommu/intel/debugfs.c

@@ -106,9 +106,6 @@ static const struct iommu_regset iommu_regs_64[] = {
 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK8),
 	IOMMU_REGSET_ENTRY(MTRR_PHYSBASE9),
 	IOMMU_REGSET_ENTRY(MTRR_PHYSMASK9),
-	IOMMU_REGSET_ENTRY(VCCAP),
-	IOMMU_REGSET_ENTRY(VCMD),
-	IOMMU_REGSET_ENTRY(VCRSP),
 };
 
 static struct dentry *intel_iommu_debug;

drivers/iommu/intel/iommu.h

@@ -140,9 +140,6 @@
 #define DMAR_ECEO_REG		0x408
 #define DMAR_ECRSP_REG		0x410
 #define DMAR_ECCAP_REG		0x430
-#define DMAR_VCCAP_REG		0xe30 /* Virtual command capability register */
-#define DMAR_VCMD_REG		0xe00 /* Virtual command register */
-#define DMAR_VCRSP_REG		0xe10 /* Virtual command response register */
 
 #define DMAR_IQER_REG_IQEI(reg)		FIELD_GET(GENMASK_ULL(3, 0), reg)
 #define DMAR_IQER_REG_ITESID(reg)	FIELD_GET(GENMASK_ULL(47, 32), reg)

drivers/iommu/intel/pasid.c

@@ -26,63 +26,6 @@
  */
 u32 intel_pasid_max_id = PASID_MAX;
 
-int vcmd_alloc_pasid(struct intel_iommu *iommu, u32 *pasid)
-{
-	unsigned long flags;
-	u8 status_code;
-	int ret = 0;
-	u64 res;
-
-	raw_spin_lock_irqsave(&iommu->register_lock, flags);
-	dmar_writeq(iommu->reg + DMAR_VCMD_REG, VCMD_CMD_ALLOC);
-	IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
-		      !(res & VCMD_VRSP_IP), res);
-	raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
-
-	status_code = VCMD_VRSP_SC(res);
-	switch (status_code) {
-	case VCMD_VRSP_SC_SUCCESS:
-		*pasid = VCMD_VRSP_RESULT_PASID(res);
-		break;
-	case VCMD_VRSP_SC_NO_PASID_AVAIL:
-		pr_info("IOMMU: %s: No PASID available\n", iommu->name);
-		ret = -ENOSPC;
-		break;
-	default:
-		ret = -ENODEV;
-		pr_warn("IOMMU: %s: Unexpected error code %d\n",
-			iommu->name, status_code);
-	}
-
-	return ret;
-}
-
-void vcmd_free_pasid(struct intel_iommu *iommu, u32 pasid)
-{
-	unsigned long flags;
-	u8 status_code;
-	u64 res;
-
-	raw_spin_lock_irqsave(&iommu->register_lock, flags);
-	dmar_writeq(iommu->reg + DMAR_VCMD_REG,
-		    VCMD_CMD_OPERAND(pasid) | VCMD_CMD_FREE);
-	IOMMU_WAIT_OP(iommu, DMAR_VCRSP_REG, dmar_readq,
-		      !(res & VCMD_VRSP_IP), res);
-	raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
-
-	status_code = VCMD_VRSP_SC(res);
-	switch (status_code) {
-	case VCMD_VRSP_SC_SUCCESS:
-		break;
-	case VCMD_VRSP_SC_INVALID_PASID:
-		pr_info("IOMMU: %s: Invalid PASID\n", iommu->name);
-		break;
-	default:
-		pr_warn("IOMMU: %s: Unexpected error code %d\n",
-			iommu->name, status_code);
-	}
-}
-
 /*
  * Per device pasid table management:
  */

drivers/iommu/intel/pasid.h

@@ -22,16 +22,6 @@
 #define is_pasid_enabled(entry)		(((entry)->lo >> 3) & 0x1)
 #define get_pasid_dir_size(entry)	(1 << ((((entry)->lo >> 9) & 0x7) + 7))
 
-/* Virtual command interface for enlightened pasid management. */
-#define VCMD_CMD_ALLOC			0x1
-#define VCMD_CMD_FREE			0x2
-#define VCMD_VRSP_IP			0x1
-#define VCMD_VRSP_SC(e)			(((e) & 0xff) >> 1)
-#define VCMD_VRSP_SC_SUCCESS		0
-#define VCMD_VRSP_SC_NO_PASID_AVAIL	16
-#define VCMD_VRSP_SC_INVALID_PASID	16
-#define VCMD_VRSP_RESULT_PASID(e)	(((e) >> 16) & 0xfffff)
-#define VCMD_CMD_OPERAND(e)		((e) << 16)
 /*
  * Domain ID reserved for pasid entries programmed for first-level
  * only and pass-through transfer modes.
@@ -117,8 +107,6 @@ int intel_pasid_setup_nested(struct intel_iommu *iommu, struct device *dev,
 void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
 				 struct device *dev, u32 pasid,
 				 bool fault_ignore);
-int vcmd_alloc_pasid(struct intel_iommu *iommu, u32 *pasid);
-void vcmd_free_pasid(struct intel_iommu *iommu, u32 pasid);
 void intel_pasid_setup_page_snoop_control(struct intel_iommu *iommu,
 					  struct device *dev, u32 pasid);
 #endif /* __INTEL_PASID_H */