kernel/vgaarb-vga_default_device.patch

                                                                                                                                                                                                                                                               
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From:	Matthew Garrett <mjg@redhat.com>
To:	linux-kernel@vger.kernel.org
Cc:	Matthew Garrett <mjg@redhat.com>, benh@kernel.crashing.org,
	airlied@redhat.com
Subject: [PATCH V2 1/4] vgaarb: Add support for setting the default video device
Date:	Mon, 16 Apr 2012 16:26:02 -0400
Message-Id: <1334607965-9582-1-git-send-email-mjg@redhat.com>
Sender:	linux-kernel-owner@vger.kernel.org
Precedence: bulk

The default VGA device is a somewhat fluid concept on platforms with
multiple GPUs. Add support for setting it so switching code can update
things appropriately, and make sure that the sysfs code returns the right
device if it's changed.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: benh@kernel.crashing.org
Cc: airlied@redhat.com
---
Updated to fix builds when __ARCH_HAS_VGA_DEFAULT_DEVICE is false.

 drivers/gpu/vga/vgaarb.c |    7 +++++++
 drivers/pci/pci-sysfs.c  |    5 +++++
 include/linux/vgaarb.h   |    2 ++
 3 files changed, 14 insertions(+)

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 111d956..e223b96 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -136,6 +136,11 @@ struct pci_dev *vga_default_device(void)
 {
 	return vga_default;
 }
+
+void vga_set_default_device(struct pci_dev *pdev)
+{
+	vga_default = pdev;
+}
 #endif
 
 static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
@@ -605,10 +610,12 @@ static bool vga_arbiter_del_pci_device(struct pci_dev *pdev)
 		goto bail;
 	}
 
+#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
 	if (vga_default == pdev) {
 		pci_dev_put(vga_default);
 		vga_default = NULL;
 	}
+#endif
 
 	if (vgadev->decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM))
 		vga_decode_count--;
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index a3cd8ca..7dd9f2b 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -27,6 +27,7 @@
 #include <linux/security.h>
 #include <linux/pci-aspm.h>
 #include <linux/slab.h>
+#include <linux/vgaarb.h>
 #include "pci.h"
 
 static int sysfs_initialized;	/* = 0 */
@@ -414,6 +415,10 @@ static ssize_t
 boot_vga_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
+	struct pci_dev *vga_dev = vga_default_device();
+
+	if (vga_dev)
+		return sprintf(buf, "%u\n", (pdev == vga_dev));
 
 	return sprintf(buf, "%u\n",
 		!!(pdev->resource[PCI_ROM_RESOURCE].flags &
diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
index 9c3120d..759a25b 100644
--- a/include/linux/vgaarb.h
+++ b/include/linux/vgaarb.h
@@ -31,6 +31,7 @@
 #ifndef LINUX_VGA_H
 #define LINUX_VGA_H
 
+#include <video/vga.h>
 
 /* Legacy VGA regions */
 #define VGA_RSRC_NONE	       0x00
@@ -181,6 +182,7 @@ extern void vga_put(struct pci_dev *pdev, unsigned int rsrc);
 
 #ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
 extern struct pci_dev *vga_default_device(void);
+extern void vga_set_default_device(struct pci_dev *pdev);
 #endif
 
 /**
-- 
1.7.10

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From:	Matthew Garrett <mjg@redhat.com>
To:	linux-kernel@vger.kernel.org
Cc:	Matthew Garrett <mjg@redhat.com>, airlied@redhat.com
Subject: [PATCH V2 2/4] vga-switcheroo: Use vga_default_device()
Date:	Mon, 16 Apr 2012 16:26:03 -0400
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vga-switcheroo currently changes the default VGA device by fiddling with
the IORESOURCE_ROM_SHADOW flag on the device. This isn't strictly accurate,
since there's no guarantee that switching also changes the ROM decoding.
Switch over to using the vgaarb functions for this.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: airlied@redhat.com
---
 drivers/gpu/vga/vga_switcheroo.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 9a2c805..44c664e 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -28,6 +28,8 @@
 #include <linux/pci.h>
 #include <linux/vga_switcheroo.h>
 
+#include <linux/vgaarb.h>
+
 struct vga_switcheroo_client {
 	struct pci_dev *pdev;
 	struct fb_info *fb_info;
@@ -140,7 +142,7 @@ int vga_switcheroo_register_client(struct pci_dev *pdev,
 	vgasr_priv.clients[index].reprobe = reprobe;
 	vgasr_priv.clients[index].can_switch = can_switch;
 	vgasr_priv.clients[index].id = -1;
-	if (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)
+	if (pdev == vga_default_device())
 		vgasr_priv.clients[index].active = true;
 
 	vgasr_priv.registered_clients |= (1 << index);
@@ -248,9 +250,8 @@ static int vga_switchto_stage1(struct vga_switcheroo_client *new_client)
 	if (new_client->pwr_state == VGA_SWITCHEROO_OFF)
 		vga_switchon(new_client);
 
-	/* swap shadow resource to denote boot VGA device has changed so X starts on new device */
-	active->pdev->resource[PCI_ROM_RESOURCE].flags &= ~IORESOURCE_ROM_SHADOW;
-	new_client->pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
+	vga_set_default_device(new_client->pdev);
+
 	return 0;
 }
 
-- 
1.7.10

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Cc:	Matthew Garrett <mjg@redhat.com>, mingo@redhat.com, hpa@zytor.com
Subject: [PATCH V2 3/4] x86: Use vga_default_device() when determining whether an fb is primary
Date:	Mon, 16 Apr 2012 16:26:04 -0400
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IORESOURCE_ROM_SHADOW is not necessarily an indication that the hardware
is the primary device. Add support for using the vgaarb functions and
fall back if nothing's set them.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: mingo@redhat.com
Cc: hpa@zytor.com
---
 arch/x86/video/fbdev.c |   20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/arch/x86/video/fbdev.c b/arch/x86/video/fbdev.c
index c5ffb6a..d5644bb 100644
--- a/arch/x86/video/fbdev.c
+++ b/arch/x86/video/fbdev.c
@@ -9,24 +9,34 @@
 #include <linux/fb.h>
 #include <linux/pci.h>
 #include <linux/module.h>
+#include <linux/vgaarb.h>
 
 int fb_is_primary_device(struct fb_info *info)
 {
 	struct device *device = info->device;
 	struct pci_dev *pci_dev = NULL;
+	struct pci_dev *default_device = vga_default_device();
 	struct resource *res = NULL;
-	int retval = 0;
 
 	if (device)
 		pci_dev = to_pci_dev(device);
 
-	if (pci_dev)
-		res = &pci_dev->resource[PCI_ROM_RESOURCE];
+	if (!pci_dev)
+		return 0;
+
+	if (default_device) {
+		if (pci_dev == default_device)
+			return 1;
+		else
+			return 0;
+	}
+
+	res = &pci_dev->resource[PCI_ROM_RESOURCE];
 
 	if (res && res->flags & IORESOURCE_ROM_SHADOW)
-		retval = 1;
+		return 1;
 
-	return retval;
+	return 0;
 }
 EXPORT_SYMBOL(fb_is_primary_device);
 MODULE_LICENSE("GPL");
-- 
1.7.10

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From:	Matthew Garrett <mjg@redhat.com>
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Cc:	Matthew Garrett <mjg@redhat.com>, hpa@zytor.com,
	matt.fleming@intel.com
Subject: [PATCH V2 4/4] efifb: Implement vga_default_device()
Date:	Mon, 16 Apr 2012 16:26:05 -0400
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EFI doesn't typically make use of the legacy VGA ROM, but it may still be
configured to pass that through to a given video device. This may lead to
an inaccurate choice of default video device. Add support to efifb to pick
out the correct active video device.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: hpa@zytor.com
Cc: matt.fleming@intel.com
---
 arch/x86/include/asm/vga.h |    6 ++++
 drivers/video/efifb.c      |   77 ++++++++++++++++++++++++++++++++------------
 2 files changed, 63 insertions(+), 20 deletions(-)

diff --git a/arch/x86/include/asm/vga.h b/arch/x86/include/asm/vga.h
index c4b9dc2..2723c07 100644
--- a/arch/x86/include/asm/vga.h
+++ b/arch/x86/include/asm/vga.h
@@ -17,4 +17,10 @@
 #define vga_readb(x) (*(x))
 #define vga_writeb(x, y) (*(y) = (x))
 
+#ifdef CONFIG_FB_EFI
+#define __ARCH_HAS_VGA_DEFAULT_DEVICE
+extern struct pci_dev *vga_default_device(void);
+extern void vga_set_default_device(struct pci_dev *pdev);
+#endif
+
 #endif /* _ASM_X86_VGA_H */
diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
index 784139a..66ed991 100644
--- a/drivers/video/efifb.c
+++ b/drivers/video/efifb.c
@@ -18,6 +18,8 @@
 
 static bool request_mem_succeeded = false;
 
+static struct pci_dev *default_vga;
+
 static struct fb_var_screeninfo efifb_defined __devinitdata = {
 	.activate		= FB_ACTIVATE_NOW,
 	.height			= -1,
@@ -298,35 +300,70 @@ static struct fb_ops efifb_ops = {
 	.fb_imageblit	= cfb_imageblit,
 };
 
+struct pci_dev *vga_default_device(void)
+{
+	return default_vga;
+}
+
+void vga_set_default_device(struct pci_dev *pdev)
+{
+	default_vga = pdev;
+}
+
 static int __init efifb_setup(char *options)
 {
 	char *this_opt;
 	int i;
+	struct pci_dev *dev = NULL;
+
+	if (options && *options) {
+		while ((this_opt = strsep(&options, ",")) != NULL) {
+			if (!*this_opt) continue;
+
+			for (i = 0; i < M_UNKNOWN; i++) {
+				if (!strcmp(this_opt, dmi_list[i].optname) &&
+				    dmi_list[i].base != 0) {
+					screen_info.lfb_base = dmi_list[i].base;
+					screen_info.lfb_linelength = dmi_list[i].stride;
+					screen_info.lfb_width = dmi_list[i].width;
+					screen_info.lfb_height = dmi_list[i].height;
+				}
+			}
+			if (!strncmp(this_opt, "base:", 5))
+				screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
+			else if (!strncmp(this_opt, "stride:", 7))
+				screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
+			else if (!strncmp(this_opt, "height:", 7))
+				screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
+			else if (!strncmp(this_opt, "width:", 6))
+				screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
+		}
+	}
 
-	if (!options || !*options)
-		return 0;
+	for_each_pci_dev(dev) {
+		int i;
 
-	while ((this_opt = strsep(&options, ",")) != NULL) {
-		if (!*this_opt) continue;
+		if ((dev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+			continue;
 
-		for (i = 0; i < M_UNKNOWN; i++) {
-			if (!strcmp(this_opt, dmi_list[i].optname) &&
-					dmi_list[i].base != 0) {
-				screen_info.lfb_base = dmi_list[i].base;
-				screen_info.lfb_linelength = dmi_list[i].stride;
-				screen_info.lfb_width = dmi_list[i].width;
-				screen_info.lfb_height = dmi_list[i].height;
-			}
+		for (i=0; i < DEVICE_COUNT_RESOURCE; i++) {
+			resource_size_t start, end;
+
+			if (!(pci_resource_flags(dev, i) & IORESOURCE_MEM))
+				continue;
+
+			start = pci_resource_start(dev, i);
+			end  = pci_resource_end(dev, i);
+
+			if (!start || !end)
+				continue;
+
+			if (screen_info.lfb_base >= start &&
+			    (screen_info.lfb_base + screen_info.lfb_size) < end)
+				default_vga = dev;
 		}
-		if (!strncmp(this_opt, "base:", 5))
-			screen_info.lfb_base = simple_strtoul(this_opt+5, NULL, 0);
-		else if (!strncmp(this_opt, "stride:", 7))
-			screen_info.lfb_linelength = simple_strtoul(this_opt+7, NULL, 0) * 4;
-		else if (!strncmp(this_opt, "height:", 7))
-			screen_info.lfb_height = simple_strtoul(this_opt+7, NULL, 0);
-		else if (!strncmp(this_opt, "width:", 6))
-			screen_info.lfb_width = simple_strtoul(this_opt+6, NULL, 0);
 	}
+
 	return 0;
 }
 
-- 
1.7.10

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Path: news.gmane.org!not-for-mail
From: Dave Airlie <airlied@gmail.com>
Newsgroups: gmane.linux.kernel
Subject: [PATCH] x86/vga: set the default device from the fixup.
Date: Mon, 14 May 2012 17:01:20 +0100
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From: Dave Airlie <airlied@redhat.com>

Since Matthew's efi/vga changes on non-EFI machines we were failing
to tell the vgaarb/switcheroo what the default device was, this
sets the default device in the quirk if none has been set before.

This fixes the switcheroo on my T410s.

[hpa: please ack to put this on top of the other patches in my -next tree].

Signed-off-by: Dave Airlie <airlied@redhat.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>

---
 arch/x86/pci/fixup.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index d0e6e40..cf81c02 100644
--- a/arch/x86/pci/fixup.c
+++ b/arch/x86/pci/fixup.c
@@ -7,6 +7,7 @@
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <asm/pci_x86.h>
+#include <asm/vga.h>
 
 static void __devinit pci_fixup_i450nx(struct pci_dev *d)
 {
@@ -348,6 +349,8 @@ static void __devinit pci_fixup_video(struct pci_dev *pdev)
 	if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
 		pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
 		dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n");
+		if (vga_default_device() == NULL)
+			vga_set_default_device(pdev);
 	}
 }
 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
-- 
1.7.6