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PCI: Cache ACS capability offset in device

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Currently the ACS capability is being looked up at a number of places. Read
and store it once at enumeration so that it can be used by all later.  No
functional change intended.

Link: https://lore.kernel.org/r/20200707224604.3737893-2-rajatja@google.com
Signed-off-by: Rajat Jain <rajatja@google.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Rajat Jain
2020-07-07 15:46:02 -07:00
committed by Bjorn Helgaas
parent cbe420361f
commit 52fbf5bdee
6 changed files with 24 additions and 11 deletions
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20
drivers/pci/pci.c
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@@ -831,7 +831,7 @@ static void pci_disable_acs_redir(struct pci_dev *dev)
if (!pci_dev_specific_disable_acs_redir(dev))
return;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
pos = dev->acs_cap;
if (!pos) {
pci_warn(dev, "cannot disable ACS redirect for this hardware as it does not have ACS capabilities\n");
return;
@@ -857,7 +857,7 @@ static void pci_std_enable_acs(struct pci_dev *dev)
u16 cap;
u16 ctrl;
pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
pos = dev->acs_cap;
if (!pos)
return;
@@ -883,7 +883,7 @@ static void pci_std_enable_acs(struct pci_dev *dev)
* pci_enable_acs - enable ACS if hardware support it
* @dev: the PCI device
*/
void pci_enable_acs(struct pci_dev *dev)
static void pci_enable_acs(struct pci_dev *dev)
{
if (!pci_acs_enable)
goto disable_acs_redir;
@@ -3362,7 +3362,7 @@ static bool pci_acs_flags_enabled(struct pci_dev *pdev, u16 acs_flags)
int pos;
u16 cap, ctrl;
pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_ACS);
pos = pdev->acs_cap;
if (!pos)
return false;
@@ -3487,6 +3487,18 @@ bool pci_acs_path_enabled(struct pci_dev *start,
return true;
}
/**
* pci_acs_init - Initialize ACS if hardware supports it
* @dev: the PCI device
*/
void pci_acs_init(struct pci_dev *dev)
{
dev->acs_cap = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ACS);
if (dev->acs_cap)
pci_enable_acs(dev);
}
/**
* pci_rebar_find_pos - find position of resize ctrl reg for BAR
* @pdev: PCI device