@@ -4553,27 +4553,81 @@ static int pci_quirk_enable_intel_spt_pch_acs(struct pci_dev *dev)
return 0;
}
-static const struct pci_dev_enable_acs {
+static int pci_quirk_disable_intel_spt_pch_acs_redir(struct pci_dev *dev)
+{
+ int pos;
+ u32 cap, ctrl;
+
+ if (!pci_quirk_intel_spt_pch_acs_match(dev))
+ return -ENOTTY;
+
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
+ if (!pos)
+ return -ENOTTY;
+
+ pci_read_config_dword(dev, pos + PCI_ACS_CAP, &cap);
+ pci_read_config_dword(dev, pos + INTEL_SPT_ACS_CTRL, &ctrl);
+
+ ctrl &= ~(PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_EC);
+
+ pci_write_config_dword(dev, pos + INTEL_SPT_ACS_CTRL, ctrl);
+
+ pci_info(dev, "Intel SPT PCH root port workaround: disabled ACS redirect\n");
+
+ return 0;
+}
+
+static const struct pci_dev_acs_ops {
u16 vendor;
u16 device;
int (*enable_acs)(struct pci_dev *dev);
-} pci_dev_enable_acs[] = {
- { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_enable_intel_pch_acs },
- { PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_enable_intel_spt_pch_acs },
- { 0 }
+ int (*disable_acs_redir)(struct pci_dev *dev);
+} pci_dev_acs_ops[] = {
+ { PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
+ .enable_acs = pci_quirk_enable_intel_pch_acs,
+ },
+ { PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
+ .enable_acs = pci_quirk_enable_intel_spt_pch_acs,
+ .disable_acs_redir = pci_quirk_disable_intel_spt_pch_acs_redir
+ },
};
int pci_dev_specific_enable_acs(struct pci_dev *dev)
{
- const struct pci_dev_enable_acs *i;
+ const struct pci_dev_acs_ops *p;
+ int i;
int ret;
- for (i = pci_dev_enable_acs; i->enable_acs; i++) {
- if ((i->vendor == dev->vendor ||
- i->vendor == (u16)PCI_ANY_ID) &&
- (i->device == dev->device ||
- i->device == (u16)PCI_ANY_ID)) {
- ret = i->enable_acs(dev);
+ for (i = 0; i < ARRAY_SIZE(pci_dev_acs_ops); i++) {
+ p = &pci_dev_acs_ops[i];
+ if ((p->vendor == dev->vendor ||
+ p->vendor == (u16)PCI_ANY_ID) &&
+ (p->device == dev->device ||
+ p->device == (u16)PCI_ANY_ID) &&
+ p->enable_acs) {
+ ret = p->enable_acs(dev);
+ if (ret >= 0)
+ return ret;
+ }
+ }
+
+ return -ENOTTY;
+}
+
+int pci_dev_specific_disable_acs_redir(struct pci_dev *dev)
+{
+ const struct pci_dev_acs_ops *p;
+ int i;
+ int ret;
+
+ for (i = 0; i < ARRAY_SIZE(pci_dev_acs_ops); i++) {
+ p = &pci_dev_acs_ops[i];
+ if ((p->vendor == dev->vendor ||
+ p->vendor == (u16)PCI_ANY_ID) &&
+ (p->device == dev->device ||
+ p->device == (u16)PCI_ANY_ID) &&
+ p->disable_acs_redir) {
+ ret = p->disable_acs_redir(dev);
if (ret >= 0)
return ret;
}
@@ -1878,6 +1878,7 @@ enum pci_fixup_pass {
void pci_fixup_device(enum pci_fixup_pass pass, struct pci_dev *dev);
int pci_dev_specific_acs_enabled(struct pci_dev *dev, u16 acs_flags);
int pci_dev_specific_enable_acs(struct pci_dev *dev);
+int pci_dev_specific_disable_acs_redir(struct pci_dev *dev);
#else
static inline void pci_fixup_device(enum pci_fixup_pass pass,
struct pci_dev *dev) { }
@@ -1890,6 +1891,10 @@ static inline int pci_dev_specific_enable_acs(struct pci_dev *dev)
{
return -ENOTTY;
}
+static inline int pci_dev_specific_disable_acs_redir(struct pci_dev *dev)
+{
+ return -ENOTTY;
+}
#endif
void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
Intel SPT PCH hardware has an implementation of the ACS bits that does not comply with the PCI express standard. To deal with this the existing code has an enable_acs() quirk for the hardware. In order to be able to correctly disable the ACS redirect bits for all hardware we need an analagous quirk to disable those bits. This adds the function pci_dev_specific_disable_acs_redir() which behaves similarly to pci_dev_specific_enable_acs() but uses a new function pointer for quirks which disables the ACS redirect bits. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> --- drivers/pci/quirks.c | 78 ++++++++++++++++++++++++++++++++++++++++++++-------- include/linux/pci.h | 5 ++++ 2 files changed, 71 insertions(+), 12 deletions(-)