[PATCH v5 10/16] PCI: Consolidate pci_iomap_range(), pci_iomap_wc_range()

Kuppuswamy Sathyanarayanan
2021-10-09T00:38:38Z

From: Andi Kleen <ak@linux.intel.com>

pci_iomap_range() and pci_iomap_wc_range() are currently duplicated
code, except that the _wc variant does not support IO ports. So,
implement them using a common helper, pci_iomap_range_map().

Also add wrappers for the maps because some architectures implement
ioremap and friends with macros.

This will allow to add more variants without excessive code
duplication. This patch has no functional changes.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
Changes since v4:
* Rebased on top of Tom Lendacky's CC guest
changes (https://www.spinics.net/lists/linux-tip-commits/msg58716.html)
* Fixed commit log as per Bjorns comments.
* Added "support_io" argument to pci_iomap_range_map() to support
__pci_ioport_map() only in pci_iomap_range().

lib/pci_iomap.c | 86 ++++++++++++++++++++++++++++---------------------
1 file changed, 49 insertions(+), 37 deletions(-)

diff --git a/lib/pci_iomap.c b/lib/pci_iomap.c
index 2d3eb1cb73b8..57bd92f599ee 100644
--- a/lib/pci_iomap.c
+++ b/lib/pci_iomap.c
@@ -10,6 +10,51 @@
#include <linux/export.h>

#ifdef CONFIG_PCI
+
+/*
+ * Callback wrappers because some architectures define ioremap et.al.
+ * as macros.
+ */
+static void __iomem *map_ioremap(phys_addr_t addr, size_t size)
+{
+ return ioremap(addr, size);
+}
+
+static void __iomem *map_ioremap_wc(phys_addr_t addr, size_t size)
+{
+ return ioremap_wc(addr, size);
+}
+
+static void __iomem *pci_iomap_range_map(struct pci_dev *dev,
+ int bar,
+ unsigned long offset,
+ unsigned long maxlen,
+ void __iomem *(*mapm)(phys_addr_t,
+ size_t),
+ bool support_io)
+{
+ resource_size_t start = pci_resource_start(dev, bar);
+ resource_size_t len = pci_resource_len(dev, bar);
+ unsigned long flags = pci_resource_flags(dev, bar);
+
+ if (len <= offset || !start)
+ return NULL;
+ len -= offset;
+ start += offset;
+ if (maxlen && len > maxlen)
+ len = maxlen;
+ if (flags & IORESOURCE_IO) {
+ if (support_io)
+ return __pci_ioport_map(dev, start, len);
+
+ return NULL;
+ }
+ if (flags & IORESOURCE_MEM)
+ return mapm(start, len);
+ /* What? */
+ return NULL;
+}
+
/**
* pci_iomap_range - create a virtual mapping cookie for a PCI BAR
* @dev: PCI device that owns the BAR
@@ -30,22 +75,8 @@ void __iomem *pci_iomap_range(struct pci_dev *dev,
unsigned long offset,
unsigned long maxlen)
{
- resource_size_t start = pci_resource_start(dev, bar);
- resource_size_t len = pci_resource_len(dev, bar);
- unsigned long flags = pci_resource_flags(dev, bar);
-
- if (len <= offset || !start)
- return NULL;
- len -= offset;
- start += offset;
- if (maxlen && len > maxlen)
- len = maxlen;
- if (flags & IORESOURCE_IO)
- return __pci_ioport_map(dev, start, len);
- if (flags & IORESOURCE_MEM)
- return ioremap(start, len);
- /* What? */
- return NULL;
+ return pci_iomap_range_map(dev, bar, offset, maxlen,
+ map_ioremap, true);
}
EXPORT_SYMBOL(pci_iomap_range);

@@ -70,27 +101,8 @@ void __iomem *pci_iomap_wc_range(struct pci_dev *dev,
unsigned long offset,
unsigned long maxlen)
{
- resource_size_t start = pci_resource_start(dev, bar);
- resource_size_t len = pci_resource_len(dev, bar);
- unsigned long flags = pci_resource_flags(dev, bar);
-
-
- if (flags & IORESOURCE_IO)
- return NULL;
-
- if (len <= offset || !start)
- return NULL;
-
- len -= offset;
- start += offset;
- if (maxlen && len > maxlen)
- len = maxlen;
-
- if (flags & IORESOURCE_MEM)
- return ioremap_wc(start, len);
-
- /* What? */
- return NULL;
+ return pci_iomap_range_map(dev, bar, offset, maxlen,
+ map_ioremap_wc, false);
}
EXPORT_SYMBOL_GPL(pci_iomap_wc_range);

--
2.25.1