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authorKeir Fraser <Keir.Fraser@cl.cam.ac.uk>2005-03-30 13:17:04 -0800
committerDave Jones <davej@redhat.com>2005-06-07 12:35:43 -0700
commit07eee78ea8ba2d0b7b20551c35a3e7dd158d50bb (patch)
treea11d2e705253faaa9779cfd83bb8ca9de311b195 /drivers/char/agp/generic.c
parente29b545cb153f230fbd8ff4c19bc98ab950f9f5c (diff)
[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>
Diffstat (limited to 'drivers/char/agp/generic.c')
-rw-r--r--drivers/char/agp/generic.c17
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index c321a924e38a..d62505b5d25a 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -153,7 +153,7 @@ void agp_free_memory(struct agp_memory *curr)
}
if (curr->page_count != 0) {
for (i = 0; i < curr->page_count; i++) {
- curr->bridge->driver->agp_destroy_page(phys_to_virt(curr->memory[i]));
+ curr->bridge->driver->agp_destroy_page(gart_to_virt(curr->memory[i]));
}
}
agp_free_key(curr->key);
@@ -209,7 +209,7 @@ struct agp_memory *agp_allocate_memory(struct agp_bridge_data *bridge,
agp_free_memory(new);
return NULL;
}
- new->memory[i] = virt_to_phys(addr);
+ new->memory[i] = virt_to_gart(addr);
new->page_count++;
}
new->bridge = bridge;
@@ -806,8 +806,7 @@ int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
break;
}
- table = (char *) __get_free_pages(GFP_KERNEL,
- page_order);
+ table = alloc_gatt_pages(page_order);
if (table == NULL) {
i++;
@@ -838,7 +837,7 @@ int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
size = ((struct aper_size_info_fixed *) temp)->size;
page_order = ((struct aper_size_info_fixed *) temp)->page_order;
num_entries = ((struct aper_size_info_fixed *) temp)->num_entries;
- table = (char *) __get_free_pages(GFP_KERNEL, page_order);
+ table = alloc_gatt_pages(page_order);
}
if (table == NULL)
@@ -853,7 +852,7 @@ int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
agp_gatt_table = (void *)table;
bridge->driver->cache_flush();
- bridge->gatt_table = ioremap_nocache(virt_to_phys(table),
+ bridge->gatt_table = ioremap_nocache(virt_to_gart(table),
(PAGE_SIZE * (1 << page_order)));
bridge->driver->cache_flush();
@@ -861,11 +860,11 @@ int agp_generic_create_gatt_table(struct agp_bridge_data *bridge)
for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
ClearPageReserved(page);
- free_pages((unsigned long) table, page_order);
+ free_gatt_pages(table, page_order);
return -ENOMEM;
}
- bridge->gatt_bus_addr = virt_to_phys(bridge->gatt_table_real);
+ bridge->gatt_bus_addr = virt_to_gart(bridge->gatt_table_real);
/* AK: bogus, should encode addresses > 4GB */
for (i = 0; i < num_entries; i++) {
@@ -919,7 +918,7 @@ int agp_generic_free_gatt_table(struct agp_bridge_data *bridge)
for (page = virt_to_page(table); page <= virt_to_page(table_end); page++)
ClearPageReserved(page);
- free_pages((unsigned long) bridge->gatt_table_real, page_order);
+ free_gatt_pages(bridge->gatt_table_real, page_order);
agp_gatt_table = NULL;
bridge->gatt_table = NULL;