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path: root/drivers/gpu/vga/vgaarb.c
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Diffstat (limited to 'drivers/gpu/vga/vgaarb.c')
-rw-r--r--drivers/gpu/vga/vgaarb.c87
1 files changed, 59 insertions, 28 deletions
diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index af025970835..7bcbf863656 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -41,6 +41,7 @@
#include <linux/poll.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
+#include <linux/screen_info.h>
#include <linux/uaccess.h>
@@ -112,10 +113,8 @@ both:
return 1;
}
-#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
/* this is only used a cookie - it should not be dereferenced */
static struct pci_dev *vga_default;
-#endif
static void vga_arb_device_card_gone(struct pci_dev *pdev);
@@ -131,7 +130,6 @@ static struct vga_device *vgadev_find(struct pci_dev *pdev)
}
/* Returns the default VGA device (vgacon's babe) */
-#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
struct pci_dev *vga_default_device(void)
{
return vga_default;
@@ -147,7 +145,6 @@ void vga_set_default_device(struct pci_dev *pdev)
pci_dev_put(vga_default);
vga_default = pci_dev_get(pdev);
}
-#endif
static inline void vga_irq_set_state(struct vga_device *vgadev, bool state)
{
@@ -237,12 +234,10 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
if (conflict->locks & lwants)
return conflict;
- /* Ok, now check if he owns the resource we want. We don't need
- * to check "decodes" since it should be impossible to own
- * own legacy resources you don't decode unless I have a bug
- * in this code...
+ /* Ok, now check if it owns the resource we want. We can
+ * lock resources that are not decoded, therefore a device
+ * can own resources it doesn't decode.
*/
- WARN_ON(conflict->owns & ~conflict->decodes);
match = lwants & conflict->owns;
if (!match)
continue;
@@ -254,13 +249,19 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
flags = 0;
pci_bits = 0;
+ /* If we can't control legacy resources via the bridge, we
+ * also need to disable normal decoding.
+ */
if (!conflict->bridge_has_one_vga) {
- vga_irq_set_state(conflict, false);
- flags |= PCI_VGA_STATE_CHANGE_DECODES;
- if (match & (VGA_RSRC_LEGACY_MEM|VGA_RSRC_NORMAL_MEM))
+ if ((match & conflict->decodes) & VGA_RSRC_LEGACY_MEM)
pci_bits |= PCI_COMMAND_MEMORY;
- if (match & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
+ if ((match & conflict->decodes) & VGA_RSRC_LEGACY_IO)
pci_bits |= PCI_COMMAND_IO;
+
+ if (pci_bits) {
+ vga_irq_set_state(conflict, false);
+ flags |= PCI_VGA_STATE_CHANGE_DECODES;
+ }
}
if (change_bridge)
@@ -268,18 +269,19 @@ static struct vga_device *__vga_tryget(struct vga_device *vgadev,
pci_set_vga_state(conflict->pdev, false, pci_bits, flags);
conflict->owns &= ~match;
- /* If he also owned non-legacy, that is no longer the case */
- if (match & VGA_RSRC_LEGACY_MEM)
+
+ /* If we disabled normal decoding, reflect it in owns */
+ if (pci_bits & PCI_COMMAND_MEMORY)
conflict->owns &= ~VGA_RSRC_NORMAL_MEM;
- if (match & VGA_RSRC_LEGACY_IO)
+ if (pci_bits & PCI_COMMAND_IO)
conflict->owns &= ~VGA_RSRC_NORMAL_IO;
}
enable_them:
/* ok dude, we got it, everybody conflicting has been disabled, let's
- * enable us. Make sure we don't mark a bit in "owns" that we don't
- * also have in "decodes". We can lock resources we don't decode but
- * not own them.
+ * enable us. Mark any bits in "owns" regardless of whether we
+ * decoded them. We can lock resources we don't decode, therefore
+ * we must track them via "owns".
*/
flags = 0;
pci_bits = 0;
@@ -291,7 +293,7 @@ enable_them:
if (wants & (VGA_RSRC_LEGACY_IO|VGA_RSRC_NORMAL_IO))
pci_bits |= PCI_COMMAND_IO;
}
- if (!!(wants & VGA_RSRC_LEGACY_MASK))
+ if (wants & VGA_RSRC_LEGACY_MASK)
flags |= PCI_VGA_STATE_CHANGE_BRIDGE;
pci_set_vga_state(vgadev->pdev, true, pci_bits, flags);
@@ -299,7 +301,7 @@ enable_them:
if (!vgadev->bridge_has_one_vga) {
vga_irq_set_state(vgadev, true);
}
- vgadev->owns |= (wants & vgadev->decodes);
+ vgadev->owns |= wants;
lock_them:
vgadev->locks |= (rsrc & VGA_RSRC_LEGACY_MASK);
if (rsrc & VGA_RSRC_LEGACY_IO)
@@ -398,7 +400,6 @@ int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
}
schedule();
remove_wait_queue(&vga_wait_queue, &wait);
- set_current_state(TASK_RUNNING);
}
return rc;
}
@@ -578,11 +579,12 @@ static bool vga_arbiter_add_pci_device(struct pci_dev *pdev)
/* Deal with VGA default device. Use first enabled one
* by default if arch doesn't have it's own hook
*/
-#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
if (vga_default == NULL &&
- ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK))
+ ((vgadev->owns & VGA_RSRC_LEGACY_MASK) == VGA_RSRC_LEGACY_MASK)) {
+ pr_info("vgaarb: setting as boot device: PCI:%s\n",
+ pci_name(pdev));
vga_set_default_device(pdev);
-#endif
+ }
vga_arbiter_check_bridge_sharing(vgadev);
@@ -616,10 +618,8 @@ static bool vga_arbiter_del_pci_device(struct pci_dev *pdev)
goto bail;
}
-#ifndef __ARCH_HAS_VGA_DEFAULT_DEVICE
if (vga_default == pdev)
vga_set_default_device(NULL);
-#endif
if (vgadev->decodes & (VGA_RSRC_LEGACY_IO | VGA_RSRC_LEGACY_MEM))
vga_decode_count--;
@@ -649,7 +649,6 @@ static inline void vga_update_device_decodes(struct vga_device *vgadev,
old_decodes = vgadev->decodes;
decodes_removed = ~new_decodes & old_decodes;
decodes_unlocked = vgadev->locks & decodes_removed;
- vgadev->owns &= ~decodes_removed;
vgadev->decodes = new_decodes;
pr_info("vgaarb: device changed decodes: PCI:%s,olddecodes=%s,decodes=%s:owns=%s\n",
@@ -1316,6 +1315,38 @@ static int __init vga_arb_device_init(void)
pr_info("vgaarb: loaded\n");
list_for_each_entry(vgadev, &vga_list, list) {
+#if defined(CONFIG_X86) || defined(CONFIG_IA64)
+ /* Override I/O based detection done by vga_arbiter_add_pci_device()
+ * as it may take the wrong device (e.g. on Apple system under EFI).
+ *
+ * Select the device owning the boot framebuffer if there is one.
+ */
+ resource_size_t start, end;
+ int i;
+
+ /* Does firmware framebuffer belong to us? */
+ for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
+ if (!(pci_resource_flags(vgadev->pdev, i) & IORESOURCE_MEM))
+ continue;
+
+ start = pci_resource_start(vgadev->pdev, i);
+ end = pci_resource_end(vgadev->pdev, i);
+
+ if (!start || !end)
+ continue;
+
+ if (screen_info.lfb_base < start ||
+ (screen_info.lfb_base + screen_info.lfb_size) >= end)
+ continue;
+ if (!vga_default_device())
+ pr_info("vgaarb: setting as boot device: PCI:%s\n",
+ pci_name(vgadev->pdev));
+ else if (vgadev->pdev != vga_default_device())
+ pr_info("vgaarb: overriding boot device: PCI:%s\n",
+ pci_name(vgadev->pdev));
+ vga_set_default_device(vgadev->pdev);
+ }
+#endif
if (vgadev->bridge_has_one_vga)
pr_info("vgaarb: bridge control possible %s\n", pci_name(vgadev->pdev));
else
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-02 20:48:34 +0000