GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-07-23 23:32:14 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

PCI: add pci_request_acs

Browse source 
Commit ae21ee65e8 "PCI: acs p2p upsteram
forwarding enabling" doesn't actually enable ACS.

Add a function to pci core to allow an IOMMU to request that ACS
be enabled.  The existing mechanism of using iommu_found() in the pci
core to know when ACS should be enabled doesn't actually work due to
initialization order;  iommu has only been detected not initialized.

Have Intel and AMD IOMMUs request ACS, and Xen does as well during early
init of dom0.

Cc: Allen Kay <allen.m.kay@intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Chris Wright 2009-12-04 12:15:21 -08:00 • committed by Jesse Barnes
parent b26a34aa47
commit 5d990b6275
6 changed files with 27 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

13
drivers/pci/pci.c
View file

@ -1550,6 +1550,16 @@ void pci_enable_ari(struct pci_dev *dev)
bridge->ari_enabled = 1;
}
static int pci_acs_enable;
/**
* pci_request_acs - ask for ACS to be enabled if supported
*/
void pci_request_acs(void)
{
pci_acs_enable = 1;
}
/**
* pci_enable_acs - enable ACS if hardware support it
* @dev: the PCI device
@ -1560,6 +1570,9 @@ void pci_enable_acs(struct pci_dev *dev)
u16 cap;
u16 ctrl;
if (!pci_acs_enable)
return;
if (!pci_is_pcie(dev))
return;