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-rw-r--r--include/linux/vgaarb.h49
1 files changed, 27 insertions, 22 deletions
diff --git a/include/linux/vgaarb.h b/include/linux/vgaarb.h
index 68229ce80fde..e81c64af80c1 100644
--- a/include/linux/vgaarb.h
+++ b/include/linux/vgaarb.h
@@ -46,9 +46,9 @@ extern void vga_set_legacy_decoding(struct pci_dev *pdev,
/**
* vga_get - acquire & locks VGA resources
*
- * pdev: pci device of the VGA card or NULL for the system default
- * rsrc: bit mask of resources to acquire and lock
- * interruptible: blocking should be interruptible by signals ?
+ * @pdev: pci device of the VGA card or NULL for the system default
+ * @rsrc: bit mask of resources to acquire and lock
+ * @interruptible: blocking should be interruptible by signals ?
*
* This function acquires VGA resources for the given
* card and mark those resources locked. If the resource requested
@@ -81,19 +81,19 @@ extern int vga_get(struct pci_dev *pdev, unsigned int rsrc,
*/
static inline int vga_get_interruptible(struct pci_dev *pdev,
- unsigned int rsrc)
+ unsigned int rsrc)
{
return vga_get(pdev, rsrc, 1);
}
/**
- * vga_get_interruptible
+ * vga_get_uninterruptible
*
* Shortcut to vga_get
*/
static inline int vga_get_uninterruptible(struct pci_dev *pdev,
- unsigned int rsrc)
+ unsigned int rsrc)
{
return vga_get(pdev, rsrc, 0);
}
@@ -165,28 +165,33 @@ static inline int vga_conflicts(struct pci_dev *p1, struct pci_dev *p2)
}
#endif
-/*
- * Register a client with the VGA arbitration logic
- * return value: number of VGA devices in system.
- *
- * Clients have two callback mechanisms they can use.
- * irq enable/disable callback -
- * If a client can't disable its GPUs VGA resources, then we
- * need to be able to ask it to turn off its irqs when we
- * turn off its mem and io decoding.
- * set_vga_decode
- * If a client can disable its GPU VGA resource, it will
- * get a callback from this to set the encode/decode state
- *
- * Clients with disable abilities should check the return value
- * of this function and if the VGA device count is > 1, should
- * disable VGA decoding resources.
+/**
+ * vga_client_register
+ *
+ * @pdev: pci device of the VGA client
+ * @cookie: client cookie to be used in callbacks
+ * @irq_set_state: irq state change callback
+ * @set_vga_decode: vga decode change callback
+ *
+ * return value: 0 on success, -1 on failure
+ * Register a client with the VGA arbitration logic
+ *
+ * Clients have two callback mechanisms they can use.
+ * irq enable/disable callback -
+ * If a client can't disable its GPUs VGA resources, then we
+ * need to be able to ask it to turn off its irqs when we
+ * turn off its mem and io decoding.
+ * set_vga_decode
+ * If a client can disable its GPU VGA resource, it will
+ * get a callback from this to set the encode/decode state
*
* Rationale: we cannot disable VGA decode resources unconditionally
* some single GPU laptops seem to require ACPI or BIOS access to the
* VGA registers to control things like backlights etc.
* Hopefully newer multi-GPU laptops do something saner, and desktops
* won't have any special ACPI for this.
+ * They driver will get a callback when VGA arbitration is first used
+ * by userspace since we some older X servers have issues.
*/
int vga_client_register(struct pci_dev *pdev, void *cookie,
void (*irq_set_state)(void *cookie, bool state),