[1/1] pci: read amd iommu virtual address width
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Commit Message
Add code to read the virtual address width for AMD processors.
Signed-off-by: Michael Piszczek <mpiszczek@ddn.com>
---
drivers/bus/pci/linux/pci.c | 42 +++++++++++++++++++++++++++++++++++++
1 file changed, 42 insertions(+)
@@ -492,6 +492,38 @@ rte_pci_scan(void)
}
#if defined(RTE_ARCH_X86)
+
+static uint64_t
+pci_device_amd_iommu_support_va(const struct rte_pci_addr *addr)
+{
+#define RD_AMD_CAP_VASIZE_SHIFT 15
+#define RD_AMD_CAP_VASIZE_MASK (0x7F << RD_AMD_CAP_VASIZE_SHIFT)
+
+ char filename[PATH_MAX];
+ FILE *fp;
+ uint64_t amd_cap_reg = 0;
+
+ snprintf(filename, sizeof(filename),
+ "%s/" PCI_PRI_FMT "/iommu/amd-iommu/cap",
+ rte_pci_get_sysfs_path(), addr->domain, addr->bus, addr->devid,
+ addr->function);
+
+ fp = fopen(filename, "r");
+ if (fp == NULL)
+ return 0;
+
+ /* We have an Amd IOMMU */
+ if (fscanf(fp, "%" PRIx64, &amd_cap_reg) != 1) {
+ RTE_LOG(ERR, EAL, "%s(): can't read %s\n", __func__, filename);
+ fclose(fp);
+ return 0;
+ }
+
+ fclose(fp);
+
+ return ((amd_cap_reg & RD_AMD_CAP_VASIZE_MASK) >> RD_AMD_CAP_VASIZE_SHIFT) + 1;
+}
+
bool
pci_device_iommu_support_va(const struct rte_pci_device *dev)
{
@@ -501,6 +533,16 @@ pci_device_iommu_support_va(const struct rte_pci_device *dev)
char filename[PATH_MAX];
FILE *fp;
uint64_t mgaw, vtd_cap_reg = 0;
+ struct stat s;
+
+ if (stat("/sys/class/iommu/ivhd2/amd-iommu", &s) == 0) {
+ mgaw = pci_device_amd_iommu_support_va(addr);
+ if (mgaw > 0) {
+ rte_mem_set_dma_mask(mgaw);
+ return true;
+ }
+ return false;
+ }
snprintf(filename, sizeof(filename),
"%s/" PCI_PRI_FMT "/iommu/intel-iommu/cap",