linux-kernel - [tip:x86/mm] PCI: Add pci_ioremap_wc

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Message-ID: <tip-c43996f4001de629af4a4d6713782e883677e5b9@git.kernel.org>
Date:	Tue, 25 Aug 2015 01:22:58 -0700
From:	"tip-bot for Luis R. Rodriguez" <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	akpm@...ux-foundation.org, vbabka@...e.cz, tglx@...utronix.de,
	tomi.valkeinen@...com, peterz@...radead.org,
	linux-kernel@...r.kernel.org, mcgrof@...e.com, jgross@...e.com,
	bp@...e.de, mingo@...nel.org, airlied@...hat.com, mgorman@...e.de,
	arnd@...db.de, torvalds@...ux-foundation.org, syrjala@....fi,
	adaplas@...il.com, hpa@...or.com, toshi.kani@...com,
	daniel.vetter@...ll.ch, bhelgaas@...gle.com, luto@...capital.net,
	plagnioj@...osoft.com, sbsiddha@...il.com, dbueso@...e.de
Subject: [tip:x86/mm] PCI: Add pci_ioremap_wc_bar()

Commit-ID:  c43996f4001de629af4a4d6713782e883677e5b9
Gitweb:     http://git.kernel.org/tip/c43996f4001de629af4a4d6713782e883677e5b9
Author:     Luis R. Rodriguez <mcgrof@...e.com>
AuthorDate: Mon, 24 Aug 2015 12:13:23 -0700
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 25 Aug 2015 09:59:43 +0200

PCI: Add pci_ioremap_wc_bar()

This lets drivers take advantage of PAT when available. It
should help with the transition of converting video drivers over
to ioremap_wc() to help with the goal of eventually using
_PAGE_CACHE_UC over _PAGE_CACHE_UC_MINUS on x86 on
ioremap_nocache(), see:

  de33c442ed2a ("x86 PAT: fix performance drop for glx, use UC minus for ioremap(), ioremap_nocache() and pci_mmap_page_range()")

Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Arnd Bergmann <arnd@...db.de>
Cc: <syrjala@....fi>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Antonino Daplas <adaplas@...il.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Davidlohr Bueso <dbueso@...e.de>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suresh Siddha <sbsiddha@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: Toshi Kani <toshi.kani@...com>
Cc: Ville Syrjälä <syrjala@....fi>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: airlied@...ux.ie
Cc: benh@...nel.crashing.org
Cc: dan.j.williams@...el.com
Cc: konrad.wilk@...cle.com
Cc: linux-fbdev@...r.kernel.org
Cc: linux-pci@...r.kernel.org
Cc: mst@...hat.com
Cc: vinod.koul@...el.com
Cc: xen-devel@...ts.xensource.com
Link: http://lkml.kernel.org/r/1440443613-13696-2-git-send-email-mcgrof@do-not-panic.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 drivers/pci/pci.c   | 14 ++++++++++++++
 include/linux/pci.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 0008c95..fdae37b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -138,6 +138,20 @@ void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 	return ioremap_nocache(res->start, resource_size(res));
 }
 EXPORT_SYMBOL_GPL(pci_ioremap_bar);
+
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar)
+{
+	/*
+	 * Make sure the BAR is actually a memory resource, not an IO resource
+	 */
+	if (!(pci_resource_flags(pdev, bar) & IORESOURCE_MEM)) {
+		WARN_ON(1);
+		return NULL;
+	}
+	return ioremap_wc(pci_resource_start(pdev, bar),
+			  pci_resource_len(pdev, bar));
+}
+EXPORT_SYMBOL_GPL(pci_ioremap_wc_bar);
 #endif
 
 #define PCI_FIND_CAP_TTL	48
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8a0321a..985dd39 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1661,6 +1661,7 @@ static inline void pci_mmcfg_late_init(void) { }
 int pci_ext_cfg_avail(void);
 
 void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
+void __iomem *pci_ioremap_wc_bar(struct pci_dev *pdev, int bar);
 
 #ifdef CONFIG_PCI_IOV
 int pci_iov_virtfn_bus(struct pci_dev *dev, int id);
--
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