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From: Clint Sbisa <csbisa@amazon.com>
To: <linux-pci@vger.kernel.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	Bjorn Helgaas <helgaas@kernel.org>, <csbisa@amazon.com>,
	<benh@kernel.crashing.org>
Subject: [PATCH] arm64: Enable PCI write-combine resources under sysfs
Date: Mon, 31 Aug 2020 15:18:27 +0000	[thread overview]
Message-ID: <20200831151827.pumm2p54fyj7fz5s@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


             reply	other threads:[~2020-08-31 15:18 UTC|newest]

Thread overview: 59+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-31 15:18 Clint Sbisa [this message]
2020-08-31 23:24 ` Benjamin Herrenschmidt
2020-09-01 18:37 ` Bjorn Helgaas
2020-09-01 23:22   ` Benjamin Herrenschmidt
2020-09-02  8:57     ` Will Deacon
2020-09-02 11:32 ` Lorenzo Pieralisi
2020-09-02 14:29   ` Clint Sbisa
2020-09-02 16:47     ` Lorenzo Pieralisi
2020-09-02 17:21       ` Catalin Marinas
2020-09-02 17:54         ` Lorenzo Pieralisi
2020-09-02 23:03           ` Benjamin Herrenschmidt
2020-09-02 23:08         ` Benjamin Herrenschmidt
2020-09-02 23:08           ` Benjamin Herrenschmidt
2020-09-02 23:07       ` Benjamin Herrenschmidt
2020-09-03 11:08         ` Lorenzo Pieralisi
2020-09-03 14:36           ` Clint Sbisa
2020-09-03 22:26           ` Benjamin Herrenschmidt
2020-09-07 23:33           ` Benjamin Herrenschmidt
2020-09-10  9:46             ` Lorenzo Pieralisi
2020-09-10 10:54               ` Leon Romanovsky
2020-09-10 12:37               ` Jason Gunthorpe
2020-09-10 15:17                 ` Lorenzo Pieralisi
2020-09-10 17:10                   ` Jason Gunthorpe
2020-09-10 21:46                     ` Benjamin Herrenschmidt
2020-09-10 23:29                       ` Jason Gunthorpe
2020-09-11  0:39                         ` Benjamin Herrenschmidt
2020-09-11 14:21                           ` Jason Gunthorpe
2020-09-11 21:42                           ` Clint Sbisa
2020-09-14 14:17                             ` Jason Gunthorpe
2020-09-14 14:24                               ` Clint Sbisa
2020-09-14 14:38                                 ` Jason Gunthorpe
2020-09-14 21:42                                   ` Benjamin Herrenschmidt
2020-09-14 22:00                                     ` Benjamin Herrenschmidt
2020-09-14 22:32                                       ` Clint Sbisa
2020-09-14 22:57                                       ` Jason Gunthorpe
2020-09-14 23:25                                         ` Benjamin Herrenschmidt
2020-09-15 10:18                                           ` Lorenzo Pieralisi
2020-09-15 11:05                                             ` Jason Gunthorpe
2020-09-15 23:17                                               ` Benjamin Herrenschmidt
2020-09-15 23:40                                                 ` Jason Gunthorpe
2020-09-16  7:59                                                   ` Benjamin Herrenschmidt
2020-09-16 12:12                                                     ` Jason Gunthorpe
2020-09-16 14:09                                                       ` Lorenzo Pieralisi
2020-09-16 14:14                                                         ` Jason Gunthorpe
2020-09-16 23:59                                                       ` Benjamin Herrenschmidt
2020-09-17 10:28                                                         ` Lorenzo Pieralisi
2020-09-17 11:32                                                           ` Jason Gunthorpe
2020-09-17 14:01                                                             ` Lorenzo Pieralisi
2020-09-17 16:08                                                               ` Will Deacon
2020-09-16 12:48                                                     ` Leon Romanovsky
2020-09-16  8:33                                                   ` Will Deacon
2020-09-16  8:48                                                     ` Catalin Marinas
2020-09-16 14:15                                                       ` Lorenzo Pieralisi
2020-09-16 17:00                                                         ` Catalin Marinas
2020-09-16 21:29                                                           ` Benjamin Herrenschmidt
2020-09-16 12:08                                                     ` Jason Gunthorpe
2020-09-15 23:00                                             ` Benjamin Herrenschmidt
2020-09-15 23:12                                               ` Clint Sbisa
2020-09-14 21:41                               ` Benjamin Herrenschmidt

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