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SubjectRe: [PATCH] PCI: Add cavium acs pci quirk
On Sat, Jan 30, 2016 at 01:33:58AM +0530, Manish Jaggi wrote:
>
> Cavium devices matching this quirk do not perform
> peer-to-peer with other functions, allowing masking out
> these bits as if they were unimplemented in the ACS capability.
>
> Acked-by: Tirumalesh Chalamarla <tchalamarla@cavium.com>
> Signed-off-by: Manish Jaggi <mjaggi@caviumnetworks.com>

Applied as follows to pci/virtualization for v4.6, thanks, Manish!

Note that this quirk applies to *all* Cavium devices. I assume that's
what you want; I only mention it because your comment says "Cavium
devices matching this quirk ...", which is all of them because the
code says PCI_ANY_ID.

Bjorn


commit b404bcfbf035413dcce539c8ba2c9986d220d8ed
Author: Manish Jaggi <mjaggi@caviumnetworks.com>
Date: Sat Jan 30 01:33:58 2016 +0530

PCI: Add ACS quirk for all Cavium devices

Cavium devices matching this quirk do not perform peer-to-peer with other
functions, allowing masking out these bits as if they were unimplemented in
the ACS capability.

Signed-off-by: Manish Jaggi <mjaggi@caviumnetworks.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Tirumalesh Chalamarla <tchalamarla@cavium.com>

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 0575a1e..85fa6a2a 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -3832,6 +3832,19 @@ static int pci_quirk_amd_sb_acs(struct pci_dev *dev, u16 acs_flags)
#endif
}

+static int pci_quirk_cavium_acs(struct pci_dev *dev, u16 acs_flags)
+{
+ /*
+ * Cavium devices matching this quirk do not perform peer-to-peer
+ * with other functions, allowing masking out these bits as if they
+ * were unimplemented in the ACS capability.
+ */
+ acs_flags &= ~(PCI_ACS_SV | PCI_ACS_TB | PCI_ACS_RR |
+ PCI_ACS_CR | PCI_ACS_UF | PCI_ACS_DT);
+
+ return acs_flags ? 0 : 1;
+}
+
/*
* Many Intel PCH root ports do provide ACS-like features to disable peer
* transactions and validate bus numbers in requests, but do not provide an
@@ -3984,6 +3997,8 @@ static const struct pci_dev_acs_enabled {
{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID, pci_quirk_intel_pch_acs },
{ 0x19a2, 0x710, pci_quirk_mf_endpoint_acs }, /* Emulex BE3-R */
{ 0x10df, 0x720, pci_quirk_mf_endpoint_acs }, /* Emulex Skyhawk-R */
+ /* Cavium ThunderX */
+ { PCI_VENDOR_ID_CAVIUM, PCI_ANY_ID, pci_quirk_cavium_acs },
{ 0 }
};

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