From: Clint Sbisa <csbisa@amazon.com>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: Clint Sbisa <csbisa@amazon.com>,
Benjamin Herrenschmidt <benh@amazon.com>,
Ali Saidi <alisaidi@amazon.com>,
David Woodhouse <dwmw@amazon.co.uk>,
"Guy Tzalik" <gtzalik@amazon.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>
Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs
Date: Fri, 21 Aug 2020 15:51:54 +0000 [thread overview]
Message-ID: <20200821155154.umharcbew46hkhuq@amazon.com> (raw)
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>
---
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;
--
2.23.3
next reply other threads:[~2020-08-21 15:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-21 15:51 Clint Sbisa [this message]
2020-08-27 14:41 ` Clint Sbisa
2020-08-31 15:22 ` Clint Sbisa
[not found] <20200901183702.GA196025@bjorn-Precision-5520>
2020-09-01 23:22 ` Benjamin Herrenschmidt
2020-09-02 8:57 ` Will Deacon
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