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PCI: Add device-specific ACS Redirect disable infrastructure

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Intel Sunrise Point (SPT) PCH hardware has an implementation of the ACS
bits that does not comply with the PCIe standard.  To deal with this we
need device-specific quirks to disable ACS redirection.

Add a new pci_dev_specific_disable_acs_redir() quirk and a new
.disable_acs_redir() function pointer for use by non-compliant devices.  No
functional change intended.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
[bhelgaas: split to separate patch, move
pci_dev_specific_disable_acs_redir() declarations to drivers/pci/pci.h]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Logan Gunthorpe 2018-08-09 16:51:43 -05:00 committed by Bjorn Helgaas
parent 3b269185c1
commit 73c47ddef2
3 changed files with 43 additions and 8 deletions
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3
drivers/pci/pci.c
View file

@ -3023,6 +3023,9 @@ static void pci_disable_acs_redir(struct pci_dev *dev)
if (ret != 1)
return;
if (!pci_dev_specific_disable_acs_redir(dev))
return;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
if (!pos) {
pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n");

5
drivers/pci/pci.h
View file

@ -355,6 +355,7 @@ void pci_enable_acs(struct pci_dev *dev);
#ifdef CONFIG_PCI_QUIRKS
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 int pci_dev_specific_acs_enabled(struct pci_dev *dev,
u16 acs_flags)
@ -365,6 +366,10 @@ 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
/* PCI error reporting and recovery */

43
drivers/pci/quirks.c
View file

@ -4553,26 +4553,32 @@ static int pci_quirk_enable_intel_spt_pch_acs(struct pci_dev *dev)
return 0;
}
static const struct pci_dev_enable_acs {
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 },
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,
},
};
int pci_dev_specific_enable_acs(struct pci_dev *dev)
{
const struct pci_dev_enable_acs *p;
const struct pci_dev_acs_ops *p;
int i, ret;
for (i = 0; i < ARRAY_SIZE(pci_dev_enable_acs); i++) {
p = &pci_dev_enable_acs[i];
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->device == (u16)PCI_ANY_ID) &&
p->enable_acs) {
ret = p->enable_acs(dev);
if (ret >= 0)
return ret;
@ -4582,6 +4588,27 @@ int pci_dev_specific_enable_acs(struct pci_dev *dev)
return -ENOTTY;
}
int pci_dev_specific_disable_acs_redir(struct pci_dev *dev)
{
const struct pci_dev_acs_ops *p;
int i, 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;
}
}
return -ENOTTY;
}
/*
* The PCI capabilities list for Intel DH895xCC VFs (device ID 0x0443) with
* QuickAssist Technology (QAT) is prematurely terminated in hardware. The