agp: use scratch page on memory remove and at GATT creation V4
Convert most AGP chipset to use scratch page as default entries.
This help avoiding GPU querying 0 address and trigger computer
fault. With KMS and memory manager we bind/unbind AGP memory
constantly and it seems that some GPU are still doing AGP
traffic even after GPU report being idle with the memory segment.
Tested (radeon GPU KMS + Xorg + compiz + glxgears + quake3) on :
- SIS 1039:0001 & 1039:0003
- Intel 865 8086:2571
Compile tested for other bridges
V2 enable scratch page on uninorth
V3 fix unbound check in uninorth insert memory (Michel Dänzer)
V4 rebase on top of drm-next branch with the lastest intel AGP
changeset (stable should use version V3 of the patch)
Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Michel Dänzer <michel@daenzer.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/char/agp/uninorth-agp.c b/drivers/char/agp/uninorth-agp.c
index 6f48931..95db713 100644
--- a/drivers/char/agp/uninorth-agp.c
+++ b/drivers/char/agp/uninorth-agp.c
@@ -28,6 +28,7 @@
*/
static int uninorth_rev;
static int is_u3;
+static u32 scratch_value;
#define DEFAULT_APERTURE_SIZE 256
#define DEFAULT_APERTURE_STRING "256"
@@ -172,7 +173,7 @@
gp = (u32 *) &agp_bridge->gatt_table[pg_start];
for (i = 0; i < mem->page_count; ++i) {
- if (gp[i]) {
+ if (gp[i] != scratch_value) {
dev_info(&agp_bridge->dev->dev,
"uninorth_insert_memory: entry 0x%x occupied (%x)\n",
i, gp[i]);
@@ -214,8 +215,9 @@
return 0;
gp = (u32 *) &agp_bridge->gatt_table[pg_start];
- for (i = 0; i < mem->page_count; ++i)
- gp[i] = 0;
+ for (i = 0; i < mem->page_count; ++i) {
+ gp[i] = scratch_value;
+ }
mb();
uninorth_tlbflush(mem);
@@ -421,8 +423,13 @@
bridge->gatt_bus_addr = virt_to_phys(table);
+ if (is_u3)
+ scratch_value = (page_to_phys(agp_bridge->scratch_page_page) >> PAGE_SHIFT) | 0x80000000UL;
+ else
+ scratch_value = cpu_to_le32((page_to_phys(agp_bridge->scratch_page_page) & 0xFFFFF000UL) |
+ 0x1UL);
for (i = 0; i < num_entries; i++)
- bridge->gatt_table[i] = 0;
+ bridge->gatt_table[i] = scratch_value;
return 0;
@@ -519,6 +526,7 @@
.agp_destroy_pages = agp_generic_destroy_pages,
.agp_type_to_mask_type = agp_generic_type_to_mask_type,
.cant_use_aperture = true,
+ .needs_scratch_page = true,
};
const struct agp_bridge_driver u3_agp_driver = {