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Message-Id: <1435195342-26879-7-git-send-email-mcgrof@do-not-panic.com>
Date: Wed, 24 Jun 2015 18:22:19 -0700
From: "Luis R. Rodriguez" <mcgrof@...not-panic.com>
To: bp@...e.de
Cc: mingo@...nel.org, arnd@...db.de, bhelgaas@...gle.com,
luto@...capital.net, akpm@...ux-foundation.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
tomi.valkeinen@...com, mst@...hat.com, toshi.kani@...com,
linux-fbdev@...r.kernel.org, xen-devel@...ts.xensource.com,
benh@...nel.crashing.org, "Luis R. Rodriguez" <mcgrof@...e.com>,
Suresh Siddha <sbsiddha@...il.com>,
Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
Juergen Gross <jgross@...e.com>,
Daniel Vetter <daniel.vetter@...ll.ch>,
Dave Airlie <airlied@...hat.com>,
Antonino Daplas <adaplas@...il.com>,
Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
Dave Hansen <dave.hansen@...ux.intel.com>,
venkatesh.pallipadi@...el.com,
Stefan Bader <stefan.bader@...onical.com>,
Ville Syrjälä <syrjala@....fi>,
Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
Davidlohr Bueso <dbueso@...e.de>, konrad.wilk@...cle.com,
ville.syrjala@...ux.intel.com, david.vrabel@...rix.com,
jbeulich@...e.com,
Roger Pau Monné <roger.pau@...rix.com>
Subject: [PATCH v8 6/9] lib: devres: add pcim_iomap_wc() variants
From: "Luis R. Rodriguez" <mcgrof@...e.com>
Now that we have pci_iomap_wc() add the respective
devres helpers. These go unexported for now but
note that should they later be exported this
must go with EXPORT_SYMBOL_GPL().
Cc: Toshi Kani <toshi.kani@...com>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Suresh Siddha <sbsiddha@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Juergen Gross <jgross@...e.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: Dave Airlie <airlied@...hat.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Antonino Daplas <adaplas@...il.com>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Cc: Tomi Valkeinen <tomi.valkeinen@...com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Michael S. Tsirkin <mst@...hat.com>
Cc: venkatesh.pallipadi@...el.com
Cc: Stefan Bader <stefan.bader@...onical.com>
Cc: Ville Syrjälä <syrjala@....fi>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Vlastimil Babka <vbabka@...e.cz>
Cc: Borislav Petkov <bp@...e.de>
Cc: Davidlohr Bueso <dbueso@...e.de>
Cc: konrad.wilk@...cle.com
Cc: ville.syrjala@...ux.intel.com
Cc: david.vrabel@...rix.com
Cc: jbeulich@...e.com
Cc: Roger Pau Monné <roger.pau@...rix.com>
Cc: linux-fbdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: xen-devel@...ts.xensource.com
Acked-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
---
include/linux/pci.h | 2 ++
lib/devres.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 78 insertions(+)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1193975..5ff15c1 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1609,9 +1609,11 @@ static inline void pci_dev_specific_enable_acs(struct pci_dev *dev) { }
#endif
void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen);
+void __iomem *pcim_iomap_wc(struct pci_dev *pdev, int bar, unsigned long maxlen);
void pcim_iounmap(struct pci_dev *pdev, void __iomem *addr);
void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
+int pcim_iomap_wc_regions(struct pci_dev *pdev, int mask, const char *name);
int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
const char *name);
void pcim_iounmap_regions(struct pci_dev *pdev, int mask);
diff --git a/lib/devres.c b/lib/devres.c
index fbe2aac..38acc53 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -304,6 +304,29 @@ void __iomem *pcim_iomap(struct pci_dev *pdev, int bar, unsigned long maxlen)
EXPORT_SYMBOL(pcim_iomap);
/**
+ * pcim_iomap_wc - Managed pcim_iomap_wc()
+ * @pdev: PCI device to iomap for
+ * @bar: BAR to iomap
+ * @maxlen: Maximum length of iomap
+ *
+ * Managed pci_iomap_wc(). Map is automatically unmapped on driver
+ * detach.
+ */
+void __iomem *pcim_iomap_wc(struct pci_dev *pdev, int bar, unsigned long maxlen)
+{
+ void __iomem **tbl;
+
+ BUG_ON(bar >= PCIM_IOMAP_MAX);
+
+ tbl = (void __iomem **)pcim_iomap_table(pdev);
+ if (!tbl || tbl[bar]) /* duplicate mappings not allowed */
+ return NULL;
+
+ tbl[bar] = pci_iomap_wc(pdev, bar, maxlen);
+ return tbl[bar];
+}
+
+/**
* pcim_iounmap - Managed pci_iounmap()
* @pdev: PCI device to iounmap for
* @addr: Address to unmap
@@ -383,6 +406,59 @@ int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name)
EXPORT_SYMBOL(pcim_iomap_regions);
/**
+ * pcim_iomap_wc_regions - Request and iomap PCI BARs with write-combining
+ * @pdev: PCI device to map IO resources for
+ * @mask: Mask of BARs to request and iomap
+ * @name: Name used when requesting regions
+ *
+ * Request and iomap regions specified by @mask with a preference for
+ * write-combining.
+ */
+int pcim_iomap_wc_regions(struct pci_dev *pdev, int mask, const char *name)
+{
+ void __iomem * const *iomap;
+ int i, rc;
+
+ iomap = pcim_iomap_table(pdev);
+ if (!iomap)
+ return -ENOMEM;
+
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ unsigned long len;
+
+ if (!(mask & (1 << i)))
+ continue;
+
+ rc = -EINVAL;
+ len = pci_resource_len(pdev, i);
+ if (!len)
+ goto err_inval;
+
+ rc = pci_request_region(pdev, i, name);
+ if (rc)
+ goto err_inval;
+
+ rc = -ENOMEM;
+ if (!pcim_iomap_wc(pdev, i, 0))
+ goto err_region;
+ }
+
+ return 0;
+
+ err_region:
+ pci_release_region(pdev, i);
+ err_inval:
+ while (--i >= 0) {
+ if (!(mask & (1 << i)))
+ continue;
+ pcim_iounmap(pdev, iomap[i]);
+ pci_release_region(pdev, i);
+ }
+
+ return rc;
+}
+
+/**
* pcim_iomap_regions_request_all - Request all BARs and iomap specified ones
* @pdev: PCI device to map IO resources for
* @mask: Mask of BARs to iomap
--
2.3.2.209.gd67f9d5.dirty
--
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