@@ -28,6 +28,76 @@ static DEFINE_SPINLOCK(pasid_lock);
u32 intel_pasid_max_id = PASID_MAX;
static DEFINE_IDR(pasid_idr);
+int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int *pasid)
+{
+ u64 res;
+ u64 cap;
+ u8 err_code;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!ecap_vcs(iommu->ecap)) {
+ pr_warn("IOMMU: %s: Hardware doesn't support virtual command\n",
+ iommu->name);
+ return -ENODEV;
+ }
+
+ cap = dmar_readq(iommu->reg + DMAR_VCCAP_REG);
+ if (!(cap & DMA_VCS_PAS)) {
+ pr_warn("IOMMU: %s: Emulation software doesn't support PASID allocation\n",
+ iommu->name);
+ return -ENODEV;
+ }
+
+ 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);
+
+ err_code = VCMD_VRSP_EC(res);
+ switch (err_code) {
+ case VCMD_VRSP_EC_SUCCESS:
+ *pasid = VCMD_VRSP_RESULE(res);
+ break;
+ case VCMD_VRSP_EC_UNAVAIL:
+ pr_info("IOMMU: %s: No PASID available\n", iommu->name);
+ ret = -ENOMEM;
+ break;
+ default:
+ ret = -ENODEV;
+ pr_warn("IOMMU: %s: Unkonwn error code %d\n",
+ iommu->name, err_code);
+ }
+
+ return ret;
+}
+
+void vcmd_free_pasid(struct intel_iommu *iommu, unsigned int pasid)
+{
+ u64 res;
+ u8 err_code;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&iommu->register_lock, flags);
+ dmar_writeq(iommu->reg + DMAR_VCMD_REG, (pasid << 8) | 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);
+
+ err_code = VCMD_VRSP_EC(res);
+ switch (err_code) {
+ case VCMD_VRSP_EC_SUCCESS:
+ break;
+ case VCMD_VRSP_EC_INVAL:
+ pr_info("IOMMU: %s: Invalid PASID\n", iommu->name);
+ break;
+ default:
+ pr_warn("IOMMU: %s: Unkonwn error code %d\n",
+ iommu->name, err_code);
+ }
+}
+
int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp)
{
int ret, min, max;
@@ -19,6 +19,16 @@
#define PASID_PDE_SHIFT 6
#define MAX_NR_PASID_BITS 20
+/* 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_EC(e) (((e) >> 1) & 0x3)
+#define VCMD_VRSP_EC_SUCCESS 0
+#define VCMD_VRSP_EC_UNAVAIL 1
+#define VCMD_VRSP_EC_INVAL 1
+#define VCMD_VRSP_RESULE(e) (((e) >> 8) & 0xfffff)
+
/*
* Domain ID reserved for pasid entries programmed for first-level
* only and pass-through transfer modes.
@@ -69,5 +79,6 @@ int intel_pasid_setup_pass_through(struct intel_iommu *iommu,
struct device *dev, int pasid);
void intel_pasid_tear_down_entry(struct intel_iommu *iommu,
struct device *dev, int pasid);
-
+int vcmd_alloc_pasid(struct intel_iommu *iommu, unsigned int *pasid);
+void vcmd_free_pasid(struct intel_iommu *iommu, unsigned int pasid);
#endif /* __INTEL_PASID_H */
@@ -173,6 +173,7 @@
#define ecap_smpwc(e) (((e) >> 48) & 0x1)
#define ecap_flts(e) (((e) >> 47) & 0x1)
#define ecap_slts(e) (((e) >> 46) & 0x1)
+#define ecap_vcs(e) (((e) >> 45) & 0x1)
#define ecap_smts(e) (((e) >> 43) & 0x1)
#define ecap_dit(e) ((e >> 41) & 0x1)
#define ecap_pasid(e) ((e >> 40) & 0x1)
@@ -289,6 +290,7 @@
/* PRS_REG */
#define DMA_PRS_PPR ((u32)1)
+#define DMA_VCS_PAS ((u64)1)
#define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
do { \