[dpdk-stable] [PATCH v3] bus/pci: forbid VA as IOVA mode if IOMMU address width too small
Burakov, Anatoly
anatoly.burakov at intel.com
Fri Jan 12 12:10:51 CET 2018
<snip>
> +#if defined(RTE_ARCH_X86)
> +static bool
> +pci_one_device_iommu_support_va(struct rte_pci_device *dev)
> +{
> +#define VTD_CAP_MGAW_SHIFT 16
> +#define VTD_CAP_MGAW_MASK (0x3fULL << VTD_CAP_MGAW_SHIFT)
> +#define X86_VA_WIDTH 47 /* From Documentation/x86/x86_64/mm.txt */
> + struct rte_pci_addr *addr = &dev->addr;
> + char filename[PATH_MAX];
> + FILE *fp;
> + uint64_t mgaw, vtd_cap_reg = 0;
> +
> + snprintf(filename, sizeof(filename),
> + "%s/" PCI_PRI_FMT "/iommu/intel-iommu/cap",
> + rte_pci_get_sysfs_path(), addr->domain, addr->bus, addr->devid,
> + addr->function);
> + if (access(filename, F_OK) == -1) {
> + /* We don't have an Intel IOMMU, assume VA supported*/
> + return true;
> + }
> +
> + /* We have an intel IOMMU */
> + fp = fopen(filename, "r");
> + if (fp == NULL) {
> + RTE_LOG(ERR, EAL, "%s(): can't open %s\n", __func__, filename);
> + return false;
> + }
> +
> + if (fscanf(fp, "%lx", &vtd_cap_reg) != 1) {
> + RTE_LOG(ERR, EAL, "%s(): can't read %s\n", __func__, filename);
> + fclose(fp);
> + return false;
> + }
> +
> + fclose(fp);
Hi Maxime,
You probably want to use eal_parse_sysfs_value() for this.
--
Thanks,
Anatoly
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