linux-kernel - [137/197] pci: Update pci_set_vga

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Message-Id: <20100422190919.572825264@kvm.kroah.org>
Date:	Thu, 22 Apr 2010 12:09:48 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Mike Travis <travis@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Robin Holt <holt@....com>, Jack Steiner <steiner@....com>,
	Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	David Airlie <airlied@...ux.ie>,
	"H. Peter Anvin" <hpa@...or.com>, maximilian attems <max@...o.at>
Subject: [137/197] pci: Update pci_set_vga_state() to call arch functions

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Mike Travis <travis@....com>

commit 95a8b6efc5d07103583f706c8a5889437d537939 upstream.

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

[akpm@...ux-foundation.org: make pci_register_set_vga_state() __init]
Signed-off-by: Mike Travis <travis@....com>
LKML-Reference: <201002022238.o12McE1J018723@...p1.linux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Robin Holt <holt@....com>
Cc: Jack Steiner <steiner@....com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: David Airlie <airlied@...ux.ie>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
Cc: maximilian attems <max@...o.at>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/pci.c   |   25 ++++++++++++++++++++++++-
 include/linux/pci.h |    5 +++++
 2 files changed, 29 insertions(+), 1 deletion(-)

--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2541,6 +2541,23 @@ int pci_resource_bar(struct pci_dev *dev
 	return 0;
 }
 
+/* Some architectures require additional programming to enable VGA */
+static arch_set_vga_state_t arch_set_vga_state;
+
+void __init 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
@@ -2554,9 +2571,15 @@ int pci_set_vga_state(struct pci_dev *de
 	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;
@@ -2771,6 +2794,7 @@ EXPORT_SYMBOL(pcim_pin_device);
 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);
@@ -2803,4 +2827,3 @@ EXPORT_SYMBOL(pci_target_state);
 EXPORT_SYMBOL(pci_prepare_to_sleep);
 EXPORT_SYMBOL(pci_back_from_sleep);
 EXPORT_SYMBOL_GPL(pci_set_pcie_reset_state);
-
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -945,6 +945,11 @@ static inline int pci_proc_domain(struct
 }
 #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 */
 
 /*


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