From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Maxime Coquelin <maxime.coquelin@redhat.com>,
dev@dpdk.org, stable@dpdk.org, jianfeng.tan@intel.com,
qi.z.zhang@intel.com, stephen@networkplumber.org,
santosh.shukla@caviumnetworks.com, thomas@monjalon.net
Cc: peterx@redhat.com
Subject: Re: [dpdk-stable] [PATCH v3] bus/pci: forbid VA as IOVA mode if IOMMU address width too small
Date: Fri, 12 Jan 2018 11:10:51 +0000 [thread overview]
Message-ID: <89c16dd0-3938-f9ae-cc9f-189388abc0a9@intel.com> (raw)
In-Reply-To: <20180112102220.20061-1-maxime.coquelin@redhat.com>
<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
next prev parent reply other threads:[~2018-01-12 11:10 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-12 10:22 Maxime Coquelin
2018-01-12 11:10 ` Burakov, Anatoly [this message]
2018-01-12 13:18 ` Maxime Coquelin
2018-01-12 22:46 ` [dpdk-stable] [dpdk-dev] " Chas Williams
2018-01-20 15:30 ` [dpdk-stable] " Thomas Monjalon
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