[PATCH 1/4] pci: Update pci_set_vga_state to call arch functions

Mike Travis
2010-01-18T18:34:40Z

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Update pci_set_vga_state to call arch dependent functions to enable
Legacy VGA I/O transactions to be redirected to correct target.

Signed-off-by: Mike Travis <travis@sgi.com>

Cc: Dave Airlie <airlied@redhat.com>
Cc: Alex Chiang <achiang@hp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Robin Holt <holt@sgi.com>
Cc: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Adam Jackson <ajax@nwnk.net>
Cc: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Gaetan Nadon <memsize@videotron.ca>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Aaron Plattner <aplattner@nvidia.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Tiago Vignatti <tiago.vignatti@nokia.com>
Cc: Cliff Wickman <cpw@sgi.com>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Christian Zander <chzander@nvidia.com>
Cc: Yu Zhao <yu.zhao@intel.com>

Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: x86@kernel.org
---
drivers/pci/pci.c | 25 ++++++++++++++++++++++++-
include/linux/pci.h | 5 +++++
2 files changed, 29 insertions(+), 1 deletion(-)

--- linux.orig/drivers/pci/pci.c
+++ linux/drivers/pci/pci.c
@@ -2544,6 +2544,23 @@
return 0;
}

+/* Some architectures require additional programming to enable VGA */
+static arch_set_vga_state_t arch_set_vga_state;
+
+void pci_register_set_vga_state(arch_set_vga_state_t func)
+{
+ arch_set_vga_state = func; /* NULL disables */
+}
+
+static int pci_set_vga_state_arch(struct pci_dev *dev, bool decode,
+ unsigned int command_bits, bool change_bridge)
+{
+ if (arch_set_vga_state)
+ return arch_set_vga_state(dev, decode, command_bits,
+ change_bridge);
+ return 0;
+}
+
/**
* pci_set_vga_state - set VGA decode state on device and parents if requested
* @dev: the PCI device
@@ -2557,9 +2574,15 @@
struct pci_bus *bus;
struct pci_dev *bridge;
u16 cmd;
+ int rc;

WARN_ON(command_bits & ~(PCI_COMMAND_IO|PCI_COMMAND_MEMORY));

+ /* ARCH specific VGA enables */
+ rc = pci_set_vga_state_arch(dev, decode, command_bits, change_bridge);
+ if (rc)
+ return rc;
+
pci_read_config_word(dev, PCI_COMMAND, &cmd);
if (decode == true)
cmd |= command_bits;
@@ -2769,6 +2792,7 @@
EXPORT_SYMBOL(pci_disable_device);
EXPORT_SYMBOL(pci_find_capability);
EXPORT_SYMBOL(pci_bus_find_capability);
+EXPORT_SYMBOL(pci_register_set_vga_state);
EXPORT_SYMBOL(pci_release_regions);
EXPORT_SYMBOL(pci_request_regions);
EXPORT_SYMBOL(pci_request_regions_exclusive);
@@ -2801,4 +2825,3 @@
EXPORT_SYMBOL(pci_prepare_to_sleep);
EXPORT_SYMBOL(pci_back_from_sleep);
EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
-
--- linux.orig/include/linux/pci.h
+++ linux/include/linux/pci.h
@@ -942,6 +942,11 @@
}
#endif /* CONFIG_PCI_DOMAINS */

+/* some architectures require additional setup to direct VGA traffic */
+typedef int (*arch_set_vga_state_t)(struct pci_dev *pdev, bool decode,
+ unsigned int command_bits, bool change_bridge);
+extern void pci_register_set_vga_state(arch_set_vga_state_t func);
+
#else /* CONFIG_PCI is not enabled */

/*

--