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Commit 46b2c32d authored by Abhinav Ratna's avatar Abhinav Ratna Committed by Bjorn Helgaas
Browse files

PCI: Add ACS quirk for iProc PAXB 

iProc PAXB Root Ports don't advertise an ACS capability, but they do not
allow peer-to-peer transactions between Root Ports.  Add an ACS quirk so
each Root Port can be in a separate IOMMU group.

[bhelgaas: commit log, comment, use common implementation style]
Link: https://lore.kernel.org/r/1566275985-25670-1-git-send-email-srinath.mannam@broadcom.com


Signed-off-by: default avatarAbhinav Ratna <abhinav.ratna@broadcom.com>
Signed-off-by: default avatarSrinath Mannam <srinath.mannam@broadcom.com>
Signed-off-by: default avatarBjorn Helgaas <bhelgaas@google.com>
Acked-by: default avatarScott Branden <scott.branden@broadcom.com>
parent e499081d

drivers/pci/quirks.c

+14 −0
Original line number Diff line number Diff line
@@ -4466,6 +4466,19 @@ static int pci_quirk_mf_endpoint_acs(struct pci_dev *dev, u16 acs_flags) 
	return acs_flags ? 0 : 1;

}



static int pci_quirk_brcm_acs(struct pci_dev *dev, u16 acs_flags)

{

	/*

	 * iProc PAXB Root Ports don't advertise an ACS capability, but

	 * they do not allow peer-to-peer transactions between Root Ports.

	 * Allow each Root Port to be in a separate IOMMU group by masking

	 * SV/RR/CR/UF bits.

	 */

	acs_flags &= ~(PCI_ACS_SV | PCI_ACS_RR | PCI_ACS_CR | PCI_ACS_UF);



	return acs_flags ? 0 : 1;

}



static const struct pci_dev_acs_enabled {

	u16 vendor;

	u16 device;
@@ -4559,6 +4572,7 @@ static const struct pci_dev_acs_enabled { 
	{ PCI_VENDOR_ID_AMPERE, 0xE00A, pci_quirk_xgene_acs },

	{ PCI_VENDOR_ID_AMPERE, 0xE00B, pci_quirk_xgene_acs },

	{ PCI_VENDOR_ID_AMPERE, 0xE00C, pci_quirk_xgene_acs },

	{ PCI_VENDOR_ID_BROADCOM, 0xD714, pci_quirk_brcm_acs },

	{ 0 }

};