linux-kernel - [PATCH v3 7/7] mm/memremap: Set caching mode for PCI P2PDMA memory to WC

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Message-Id: <20200221182503.28317-8-logang@deltatee.com>
Date:   Fri, 21 Feb 2020 11:25:03 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        platform-driver-x86@...r.kernel.org, linux-mm@...ck.org,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christoph Hellwig <hch@....de>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Eric Badger <ebadger@...aio.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH v3 7/7] mm/memremap: Set caching mode for PCI P2PDMA memory to WC

PCI BAR IO memory should never be mapped as WB, however prior to this
the PAT bits were set WB and it was typically overridden by MTRR
registers set by the firmware.

Set PCI P2PDMA memory to be WC (writecombining) as the only current
user (the NVMe CMB) was originally mapped WC before the P2PDMA code
replaced the mapping with devm_memremap_pages().

Future use-cases may need to generalize this by adding flags to
select the caching type, as some P2PDMA cases will not want WC.
However, those use-cases are not upstream yet and this can be changed
when they arrive.

Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Signed-off-by: Logan Gunthorpe <logang@...tatee.com>
---
 mm/memremap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/memremap.c b/mm/memremap.c
index 06742372a203..8d141c3e3364 100644
--- a/mm/memremap.c
+++ b/mm/memremap.c
@@ -190,7 +190,10 @@ void *memremap_pages(struct dev_pagemap *pgmap, int nid)
 		}
 		break;
 	case MEMORY_DEVICE_DEVDAX:
+		need_devmap_managed = false;
+		break;
 	case MEMORY_DEVICE_PCI_P2PDMA:
+		params.pgprot = pgprot_writecombine(params.pgprot);
 		need_devmap_managed = false;
 		break;
 	default:
-- 
2.20.1