Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-23 20:51:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

PCI: Add ACS quirk for Qualcomm QDF2400 and QDF2432

Browse Source 
The Qualcomm QDF2xxx root ports don't advertise an ACS capability, but they
do provide ACS-like features to disable peer transactions and validate bus
numbers in requests.

To be specific:
* Hardware supports source validation but it will report the issue as
Completer Abort instead of ACS Violation.

* Hardware doesn't support peer-to-peer and each root port is a root
complex with unique segment numbers.

* It is not possible for one root port to pass traffic to the other root
port.  All PCIe transactions are terminated inside the root port.

Add an ACS quirk for the QDF2400 and QDF2432 products.

[bhelgaas: changelog]
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Sinan Kaya 2017-02-16 17:01:45 -05:00 committed by Bjorn Helgaas
parent 5b0948dfe1
commit 33be632b84
1 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/pci/quirks.c
View File

@ -4135,6 +4135,26 @@ static int pci_quirk_intel_pch_acs(struct pci_dev *dev, u16 acs_flags)
return acs_flags & ~flags ? 0 : 1;
}
/*
* These QCOM root ports do provide ACS-like features to disable peer
* transactions and validate bus numbers in requests, but do not provide an
* actual PCIe ACS capability. Hardware supports source validation but it
* will report the issue as Completer Abort instead of ACS Violation.
* Hardware doesn't support peer-to-peer and each root port is a root
* complex with unique segment numbers. It is not possible for one root
* port to pass traffic to another root port. All PCIe transactions are
* terminated inside the root port.
*/
static int pci_quirk_qcom_rp_acs(struct pci_dev *dev, u16 acs_flags)
{
u16 flags = (PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_SV);
int ret = acs_flags & ~flags ? 0 : 1;
dev_info(&dev->dev, "Using QCOM ACS Quirk (%d)\n", ret);
return ret;
}
/*
* Sunrise Point PCH root ports implement ACS, but unfortunately as shown in
* the datasheet (Intel 100 Series Chipset Family PCH Datasheet, Vol. 2,
@ -4291,6 +4311,9 @@ static const struct pci_dev_acs_enabled {
/* I219 */
{ PCI_VENDOR_ID_INTEL, 0x15b7, pci_quirk_mf_endpoint_acs },
{ PCI_VENDOR_ID_INTEL, 0x15b8, pci_quirk_mf_endpoint_acs },
/* QCOM QDF2xxx root ports */
{ 0x17cb, 0x400, pci_quirk_qcom_rp_acs },
{ 0x17cb, 0x401, pci_quirk_qcom_rp_acs },
/* Intel PCH root ports */
{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_spt_pch_acs },