| Message ID | 20201007201120.12793-3-kamal@canonical.com |
|---|---|
| State | New |
| Headers | show |
| Series | [PATCHv2,AWS-{F,G}] UBUNTU: SAUCE: arm64: Enable PCI write-combine resources under sysfs | expand |
Applied to aws-focal. Thanks! Ian On 2020-10-07 13:11:20 , Kamal Mostafa wrote: > From: Clint Sbisa <csbisa@amazon.com> > > BugLink: https://bugs.launchpad.net/bugs/1893817 > > Using write-combine is crucial for performance of PCI devices where > significant amounts of transactions go over PCI BARs. > > arm64 supports write-combine PCI mappings, so the appropriate define > has been added which will expose write-combine mappings under sysfs > for prefetchable PCI resources. > > Signed-off-by: Clint Sbisa <csbisa@amazon.com> > Reference: https://lore.kernel.org/linux-pci/20200831151827.pumm2p54fyj7fz5s@amazon.com/ > Signed-off-by: Kamal Mostafa <kamal@canonical.com> > Acked-by: Stefan Bader <stefan.bader@canonical.com> > Acked-by: Andrea Righi <andrea.righi@canonical.com> > --- > arch/arm64/include/asm/pci.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h > index 70b323cf8300..b33ca260e3c9 100644 > --- a/arch/arm64/include/asm/pci.h > +++ b/arch/arm64/include/asm/pci.h > @@ -17,6 +17,7 @@ > #define pcibios_assign_all_busses() \ > (pci_has_flag(PCI_REASSIGN_ALL_BUS)) > > +#define arch_can_pci_mmap_wc() 1 > #define ARCH_GENERIC_PCI_MMAP_RESOURCE 1 > > extern int isa_dma_bridge_buggy; > -- > 2.17.1 > > -- > kernel-team mailing list > kernel-team@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/kernel-team
diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h index 70b323cf8300..b33ca260e3c9 100644 --- a/arch/arm64/include/asm/pci.h +++ b/arch/arm64/include/asm/pci.h @@ -17,6 +17,7 @@ #define pcibios_assign_all_busses() \ (pci_has_flag(PCI_REASSIGN_ALL_BUS)) +#define arch_can_pci_mmap_wc() 1 #define ARCH_GENERIC_PCI_MMAP_RESOURCE 1 extern int isa_dma_bridge_buggy;