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Subject[PATCH 1/5] ttm: Introduce a placeholder for DMA (bus) addresses.
Date
This is right now limited to only non-pool constructs.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/gpu/drm/ttm/ttm_page_alloc.c | 9 ++++++---
drivers/gpu/drm/ttm/ttm_tt.c | 10 ++++++++--
include/drm/ttm/ttm_bo_driver.h | 2 ++
include/drm/ttm/ttm_page_alloc.h | 8 ++++++--
4 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc.c b/drivers/gpu/drm/ttm/ttm_page_alloc.c
index b1e02ff..6859288 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc.c
@@ -38,6 +38,7 @@
#include <linux/mm.h>
#include <linux/seq_file.h> /* for seq_printf */
#include <linux/slab.h>
+#include <linux/dma-mapping.h>

#include <asm/atomic.h>

@@ -662,7 +663,8 @@ out:
* cached pages.
*/
int ttm_get_pages(struct list_head *pages, int flags,
- enum ttm_caching_state cstate, unsigned count)
+ enum ttm_caching_state cstate, unsigned count,
+ dma_addr_t *dma_address)
{
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
struct page *p = NULL;
@@ -720,7 +722,7 @@ int ttm_get_pages(struct list_head *pages, int flags,
printk(KERN_ERR TTM_PFX
"Failed to allocate extra pages "
"for large request.");
- ttm_put_pages(pages, 0, flags, cstate);
+ ttm_put_pages(pages, 0, flags, cstate, NULL);
return r;
}
}
@@ -731,7 +733,8 @@ int ttm_get_pages(struct list_head *pages, int flags,

/* Put all pages in pages list to correct pool to wait for reuse */
void ttm_put_pages(struct list_head *pages, unsigned page_count, int flags,
- enum ttm_caching_state cstate)
+ enum ttm_caching_state cstate,
+ dma_addr_t *dma_address)
{
unsigned long irq_flags;
struct ttm_page_pool *pool = ttm_get_pool(flags, cstate);
diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
index af789dc..0d39001 100644
--- a/drivers/gpu/drm/ttm/ttm_tt.c
+++ b/drivers/gpu/drm/ttm/ttm_tt.c
@@ -49,12 +49,16 @@ static int ttm_tt_swapin(struct ttm_tt *ttm);
static void ttm_tt_alloc_page_directory(struct ttm_tt *ttm)
{
ttm->pages = drm_calloc_large(ttm->num_pages, sizeof(*ttm->pages));
+ ttm->dma_address = drm_calloc_large(ttm->num_pages,
+ sizeof(*ttm->dma_address));
}

static void ttm_tt_free_page_directory(struct ttm_tt *ttm)
{
drm_free_large(ttm->pages);
ttm->pages = NULL;
+ drm_free_large(ttm->dma_address);
+ ttm->dma_address = NULL;
}

static void ttm_tt_free_user_pages(struct ttm_tt *ttm)
@@ -105,7 +109,8 @@ static struct page *__ttm_tt_get_page(struct ttm_tt *ttm, int index)

INIT_LIST_HEAD(&h);

- ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1);
+ ret = ttm_get_pages(&h, ttm->page_flags, ttm->caching_state, 1,
+ &ttm->dma_address[index]);

if (ret != 0)
return NULL;
@@ -298,7 +303,8 @@ static void ttm_tt_free_alloced_pages(struct ttm_tt *ttm)
count++;
}
}
- ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state);
+ ttm_put_pages(&h, count, ttm->page_flags, ttm->caching_state,
+ ttm->dma_address);
ttm->state = tt_unpopulated;
ttm->first_himem_page = ttm->num_pages;
ttm->last_lomem_page = -1;
diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
index 8e0c848..6dc4fcc 100644
--- a/include/drm/ttm/ttm_bo_driver.h
+++ b/include/drm/ttm/ttm_bo_driver.h
@@ -149,6 +149,7 @@ enum ttm_caching_state {
* @swap_storage: Pointer to shmem struct file for swap storage.
* @caching_state: The current caching state of the pages.
* @state: The current binding state of the pages.
+ * @dma_address: The DMA (bus) addresses of the pages (if TTM_PAGE_FLAG_DMA32)
*
* This is a structure holding the pages, caching- and aperture binding
* status for a buffer object that isn't backed by fixed (VRAM / AGP)
@@ -173,6 +174,7 @@ struct ttm_tt {
tt_unbound,
tt_unpopulated,
} state;
+ dma_addr_t *dma_address;
};

#define TTM_MEMTYPE_FLAG_FIXED (1 << 0) /* Fixed (on-card) PCI memory */
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 1168214..8062890 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -36,11 +36,13 @@
* @flags: ttm flags for page allocation.
* @cstate: ttm caching state for the page.
* @count: number of pages to allocate.
+ * @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
*/
int ttm_get_pages(struct list_head *pages,
int flags,
enum ttm_caching_state cstate,
- unsigned count);
+ unsigned count,
+ dma_addr_t *dma_address);
/**
* Put linked list of pages to pool.
*
@@ -49,11 +51,13 @@ int ttm_get_pages(struct list_head *pages,
* count.
* @flags: ttm flags for page allocation.
* @cstate: ttm caching state.
+ * @dma_address: The DMA (bus) address of pages (if TTM_PAGE_FLAG_DMA32 set).
*/
void ttm_put_pages(struct list_head *pages,
unsigned page_count,
int flags,
- enum ttm_caching_state cstate);
+ enum ttm_caching_state cstate,
+ dma_addr_t *dma_address);
/**
* Initialize pool allocator.
*/
--
1.7.1


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