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authorZhenyu Wang <zhenyu.z.wang@intel.com>2009-07-23 17:25:49 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2009-08-03 09:04:47 +0100
commitff663cf8705bea101d5f73cf471855c85242575e (patch)
tree4b338298e69d2401cab848b4b9082bef07e5d9aa
parent2a4ceb6d3e6a566cb4a9dc8f974177f031d27cd7 (diff)
agp: Add generic support for graphics dma remapping
New driver hooks for support graphics memory dma remapping are introduced in this patch. It makes generic code can tell if current device needs dma remapping, then call driver provided interfaces for mapping and unmapping. Change has also been made to handle scratch_page in remapping case. Signed-off-by: Zhenyu Wang <zhenyu.z.wang@intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/char/agp/agp.h6
-rw-r--r--drivers/char/agp/backend.c20
-rw-r--r--drivers/char/agp/generic.c9
-rw-r--r--include/linux/agp_backend.h6
4 files changed, 40 insertions, 1 deletions
diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h
index ce110a3bf298..17e6d0d3ba36 100644
--- a/drivers/char/agp/agp.h
+++ b/drivers/char/agp/agp.h
@@ -121,6 +121,11 @@ struct agp_bridge_driver {
void (*agp_destroy_pages)(struct agp_memory *);
int (*agp_type_to_mask_type) (struct agp_bridge_data *, int);
void (*chipset_flush)(struct agp_bridge_data *);
+
+ int (*agp_map_page)(void *addr, dma_addr_t *ret);
+ void (*agp_unmap_page)(void *addr, dma_addr_t dma);
+ int (*agp_map_memory)(struct agp_memory *mem);
+ void (*agp_unmap_memory)(struct agp_memory *mem);
};
struct agp_bridge_data {
@@ -135,6 +140,7 @@ struct agp_bridge_data {
u32 *gatt_table_real;
unsigned long scratch_page;
unsigned long scratch_page_real;
+ dma_addr_t scratch_page_dma;
unsigned long gart_bus_addr;
unsigned long gatt_bus_addr;
u32 mode;
diff --git a/drivers/char/agp/backend.c b/drivers/char/agp/backend.c
index 3bd7e503de41..19ac3663acdc 100644
--- a/drivers/char/agp/backend.c
+++ b/drivers/char/agp/backend.c
@@ -152,6 +152,15 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
bridge->scratch_page_real = phys_to_gart(page_to_phys(page));
bridge->scratch_page = bridge->driver->mask_memory(bridge,
phys_to_gart(page_to_phys(page)), 0);
+
+ if (bridge->driver->agp_map_page &&
+ bridge->driver->agp_map_page(phys_to_virt(page_to_phys(page)),
+ &bridge->scratch_page_dma)) {
+ dev_err(&bridge->dev->dev,
+ "unable to dma-map scratch page\n");
+ rc = -ENOMEM;
+ goto err_out_nounmap;
+ }
}
size_value = bridge->driver->fetch_size();
@@ -191,6 +200,13 @@ static int agp_backend_initialize(struct agp_bridge_data *bridge)
return 0;
err_out:
+ if (bridge->driver->needs_scratch_page &&
+ bridge->driver->agp_unmap_page) {
+ void *va = gart_to_virt(bridge->scratch_page_real);
+
+ bridge->driver->agp_unmap_page(va, bridge->scratch_page_dma);
+ }
+err_out_nounmap:
if (bridge->driver->needs_scratch_page) {
void *va = gart_to_virt(bridge->scratch_page_real);
@@ -221,6 +237,10 @@ static void agp_backend_cleanup(struct agp_bridge_data *bridge)
bridge->driver->needs_scratch_page) {
void *va = gart_to_virt(bridge->scratch_page_real);
+ if (bridge->driver->agp_unmap_page)
+ bridge->driver->agp_unmap_page(va,
+ bridge->scratch_page_dma);
+
bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_UNMAP);
bridge->driver->agp_destroy_page(va, AGP_PAGE_DESTROY_FREE);
}
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index a3bcc7ef42f9..28f0208c66a6 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -437,6 +437,12 @@ int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
curr->bridge->driver->cache_flush();
curr->is_flushed = true;
}
+
+ if (curr->bridge->driver->agp_map_memory) {
+ ret_val = curr->bridge->driver->agp_map_memory(curr);
+ if (ret_val)
+ return ret_val;
+ }
ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
if (ret_val != 0)
@@ -478,6 +484,9 @@ int agp_unbind_memory(struct agp_memory *curr)
if (ret_val != 0)
return ret_val;
+ if (curr->bridge->driver->agp_unmap_memory)
+ curr->bridge->driver->agp_unmap_memory(curr);
+
curr->is_bound = false;
curr->pg_start = 0;
spin_lock(&curr->bridge->mapped_lock);
diff --git a/include/linux/agp_backend.h b/include/linux/agp_backend.h
index 76fa794fdac0..8a294d65b9b1 100644
--- a/include/linux/agp_backend.h
+++ b/include/linux/agp_backend.h
@@ -79,9 +79,13 @@ struct agp_memory {
u32 physical;
bool is_bound;
bool is_flushed;
- bool vmalloc_flag;
+ bool vmalloc_flag;
+ bool sg_vmalloc_flag;
/* list of agp_memory mapped to the aperture */
struct list_head mapped_list;
+ /* DMA-mapped addresses */
+ struct scatterlist *sg_list;
+ int num_sg;
};
#define AGP_NORMAL_MEMORY 0