[PATCH] AGP fix for Xen VMM
When Linux is running on the Xen virtual machine monitor, physical
addresses are virtualised and cannot be directly referenced by the AGP
GART. This patch fixes the GART driver for Xen by adding a layer of
abstraction between physical addresses and 'GART addresses'.
Architecture-specific functions are also defined for allocating and freeing
the GATT. Xen requires this to ensure that table really is contiguous from
the point of view of the GART.
These extra interface functions are defined as 'no-ops' for all existing
architectures that use the GART driver.
Signed-off-by: Keir Fraser <keir@xensource.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Dave Jones <davej@redhat.com>
diff --git a/drivers/char/agp/ati-agp.c b/drivers/char/agp/ati-agp.c
index a65f882..e572ced 100644
--- a/drivers/char/agp/ati-agp.c
+++ b/drivers/char/agp/ati-agp.c
@@ -61,7 +61,7 @@
SetPageReserved(virt_to_page(page_map->real));
err = map_page_into_agp(virt_to_page(page_map->real));
- page_map->remapped = ioremap_nocache(virt_to_phys(page_map->real),
+ page_map->remapped = ioremap_nocache(virt_to_gart(page_map->real),
PAGE_SIZE);
if (page_map->remapped == NULL || err) {
ClearPageReserved(virt_to_page(page_map->real));
@@ -343,7 +343,7 @@
agp_bridge->gatt_table_real = (u32 *)page_dir.real;
agp_bridge->gatt_table = (u32 __iomem *) page_dir.remapped;
- agp_bridge->gatt_bus_addr = virt_to_bus(page_dir.real);
+ agp_bridge->gatt_bus_addr = virt_to_gart(page_dir.real);
/* Write out the size register */
current_size = A_SIZE_LVL2(agp_bridge->current_size);
@@ -373,7 +373,7 @@
/* Calculate the agp offset */
for(i = 0; i < value->num_entries / 1024; i++, addr += 0x00400000) {
- writel(virt_to_bus(ati_generic_private.gatt_pages[i]->real) | 1,
+ writel(virt_to_gart(ati_generic_private.gatt_pages[i]->real) | 1,
page_dir.remapped+GET_PAGE_DIR_OFF(addr));
readl(page_dir.remapped+GET_PAGE_DIR_OFF(addr)); /* PCI Posting. */
}