139 lines
3.9 KiB
Diff
139 lines
3.9 KiB
Diff
diff --unified --recursive --text a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
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--- a/Documentation/admin-guide/kernel-parameters.txt 2023-08-26 21:41:59.900155485 +0200
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+++ b/Documentation/admin-guide/kernel-parameters.txt 2023-08-26 21:42:33.030920840 +0200
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@@ -4256,6 +4256,14 @@
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nomsi [MSI] If the PCI_MSI kernel config parameter is
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enabled, this kernel boot option can be used to
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disable the use of MSI interrupts system-wide.
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+ pci_acs_override [PCIE] Override missing PCIe ACS support for:
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+ downstream
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+ All downstream ports - full ACS capabilities
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+ multifunction
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+ Add multifunction devices - multifunction ACS subset
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+ id:nnnn:nnnn
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+ Specific device - full ACS capabilities
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+ Specified as vid:did (vendor/device ID) in hex
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noioapicquirk [APIC] Disable all boot interrupt quirks.
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Safety option to keep boot IRQs enabled. This
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should never be necessary.
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diff --unified --recursive --text a/drivers/pci/quirks.c b/drivers/pci/quirks.c
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--- a/drivers/pci/quirks.c 2023-08-26 21:42:01.850200571 +0200
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+++ b/drivers/pci/quirks.c 2023-08-26 21:42:33.030920840 +0200
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@@ -194,6 +194,106 @@
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}
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fs_initcall_sync(pci_apply_final_quirks);
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+static bool acs_on_downstream;
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+static bool acs_on_multifunction;
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+
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+#define NUM_ACS_IDS 16
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+struct acs_on_id {
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+ unsigned short vendor;
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+ unsigned short device;
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+};
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+static struct acs_on_id acs_on_ids[NUM_ACS_IDS];
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+static u8 max_acs_id;
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+
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+static __init int pcie_acs_override_setup(char *p)
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+{
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+ if (!p)
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+ return -EINVAL;
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+
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+ while (*p) {
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+ if (!strncmp(p, "downstream", 10))
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+ acs_on_downstream = true;
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+ if (!strncmp(p, "multifunction", 13))
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+ acs_on_multifunction = true;
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+ if (!strncmp(p, "id:", 3)) {
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+ char opt[5];
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+ int ret;
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+ long val;
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+
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+ if (max_acs_id >= NUM_ACS_IDS - 1) {
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+ pr_warn("Out of PCIe ACS override slots (%d)\n",
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+ NUM_ACS_IDS);
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+ goto next;
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+ }
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+
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+ p += 3;
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+ snprintf(opt, 5, "%s", p);
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+ ret = kstrtol(opt, 16, &val);
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+ if (ret) {
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+ pr_warn("PCIe ACS ID parse error %d\n", ret);
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+ goto next;
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+ }
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+ acs_on_ids[max_acs_id].vendor = val;
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+ p += strcspn(p, ":");
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+ if (*p != ':') {
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+ pr_warn("PCIe ACS invalid ID\n");
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+ goto next;
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+ }
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+
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+ p++;
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+ snprintf(opt, 5, "%s", p);
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+ ret = kstrtol(opt, 16, &val);
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+ if (ret) {
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+ pr_warn("PCIe ACS ID parse error %d\n", ret);
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+ goto next;
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+ }
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+ acs_on_ids[max_acs_id].device = val;
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+ max_acs_id++;
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+ }
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+next:
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+ p += strcspn(p, ",");
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+ if (*p == ',')
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+ p++;
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+ }
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+
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+ if (acs_on_downstream || acs_on_multifunction || max_acs_id)
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+ pr_warn("Warning: PCIe ACS overrides enabled; This may allow non-IOMMU protected peer-to-peer DMA\n");
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+
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+ return 0;
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+}
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+early_param("pcie_acs_override", pcie_acs_override_setup);
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+
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+static int pcie_acs_overrides(struct pci_dev *dev, u16 acs_flags)
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+{
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+ int i;
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+
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+ /* Never override ACS for legacy devices or devices with ACS caps */
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+ if (!pci_is_pcie(dev) ||
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+ pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS))
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+ return -ENOTTY;
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+
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+ for (i = 0; i < max_acs_id; i++)
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+ if (acs_on_ids[i].vendor == dev->vendor &&
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+ acs_on_ids[i].device == dev->device)
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+ return 1;
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+
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+switch (pci_pcie_type(dev)) {
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+ case PCI_EXP_TYPE_DOWNSTREAM:
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+ case PCI_EXP_TYPE_ROOT_PORT:
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+ if (acs_on_downstream)
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+ return 1;
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+ break;
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+ case PCI_EXP_TYPE_ENDPOINT:
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+ case PCI_EXP_TYPE_UPSTREAM:
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+ case PCI_EXP_TYPE_LEG_END:
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+ case PCI_EXP_TYPE_RC_END:
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+ if (acs_on_multifunction && dev->multifunction)
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+ return 1;
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+ }
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+
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+ return -ENOTTY;
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+}
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+
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/*
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* Decoding should be disabled for a PCI device during BAR sizing to avoid
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* conflict. But doing so may cause problems on host bridge and perhaps other
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@@ -5017,6 +5117,8 @@
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{ PCI_VENDOR_ID_ZHAOXIN, PCI_ANY_ID, pci_quirk_zhaoxin_pcie_ports_acs },
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/* Wangxun nics */
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{ PCI_VENDOR_ID_WANGXUN, PCI_ANY_ID, pci_quirk_wangxun_nic_acs },
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+ /* allow acs for any */
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+ { PCI_ANY_ID, PCI_ANY_ID, pcie_acs_overrides },
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{ 0 }
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};
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--
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