From 73c47ddef29b5869a2221e93cefdb56fd8263718 Mon Sep 17 00:00:00 2001 From: Logan Gunthorpe Date: Thu, 9 Aug 2018 16:51:43 -0500 Subject: [PATCH] PCI: Add device-specific ACS Redirect disable infrastructure 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 [bhelgaas: split to separate patch, move pci_dev_specific_disable_acs_redir() declarations to drivers/pci/pci.h] Signed-off-by: Bjorn Helgaas Reviewed-by: Alex Williamson --- drivers/pci/pci.c | 3 +++ drivers/pci/pci.h | 5 +++++ drivers/pci/quirks.c | 43 +++++++++++++++++++++++++++++++++++-------- 3 files changed, 43 insertions(+), 8 deletions(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 822577d9b39e..17d8de109556 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -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"); diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index a1224fef3409..04f5035d12c6 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -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 */ diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 823d8e4b4b37..4f79631159eb 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -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