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pci-v6.12-fixes-2

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Merge tag 'pci-v6.12-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull pci fix from Bjorn Helgaas:

 - Enable device-specific ACS-like functionality even if the device
   doesn't advertise an ACS capability, which got broken when adding
   fancy ACS kernel parameter (Jason Gunthorpe)

* tag 'pci-v6.12-fixes-2' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  PCI: Fix pci_enable_acs() support for the ACS quirks
This commit is contained in:
Linus Torvalds 2024-11-01 15:44:23 -10:00
commit 05b92660cd
1 changed files with 9 additions and 5 deletions
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14
drivers/pci/pci.c
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@ -1067,8 +1067,15 @@ static void pci_std_enable_acs(struct pci_dev *dev, struct pci_acs *caps)
static void pci_enable_acs(struct pci_dev *dev)
{
struct pci_acs caps;
bool enable_acs = false;
int pos;
/* If an iommu is present we start with kernel default caps */
if (pci_acs_enable) {
if (pci_dev_specific_enable_acs(dev))
enable_acs = true;
}
pos = dev->acs_cap;
if (!pos)
return;
@ -1077,11 +1084,8 @@ static void pci_enable_acs(struct pci_dev *dev)
pci_read_config_word(dev, pos + PCI_ACS_CTRL, &caps.ctrl);
caps.fw_ctrl = caps.ctrl;
/* If an iommu is present we start with kernel default caps */
if (pci_acs_enable) {
if (pci_dev_specific_enable_acs(dev))
pci_std_enable_acs(dev, &caps);
}
if (enable_acs)
pci_std_enable_acs(dev, &caps);
/*
* Always apply caps from the command line, even if there is no iommu.