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Subject[PATCH 09/11] ttm: Add 'no_dma' parameter to turn the TTM DMA pool off during runtime.
Date
The TTM DMA only gets turned on when the SWIOTLB is enabled - but
we might also want to turn it off when SWIOTLB is on to
use the non-DMA TTM pool code.

In the future this parameter can be removed.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/gpu/drm/ttm/ttm_memory.c | 7 +++++--
drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 6 +++++-
include/drm/ttm/ttm_page_alloc.h | 2 ++
3 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_memory.c b/drivers/gpu/drm/ttm/ttm_memory.c
index 6d24fe2..f883a28 100644
--- a/drivers/gpu/drm/ttm/ttm_memory.c
+++ b/drivers/gpu/drm/ttm/ttm_memory.c
@@ -395,7 +395,9 @@ int ttm_mem_global_init(struct ttm_mem_global *glob)
zone->name, (unsigned long long) zone->max_mem >> 10);
}
ttm_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
- ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem/(2*PAGE_SIZE));
+ if (!ttm_dma_disable)
+ ttm_dma_page_alloc_init(glob, glob->zone_kernel->max_mem /
+ (2*PAGE_SIZE));
return 0;
out_no_zone:
ttm_mem_global_release(glob);
@@ -411,7 +413,8 @@ void ttm_mem_global_release(struct ttm_mem_global *glob)
/* let the page allocator first stop the shrink work. */
ttm_page_alloc_fini();

- ttm_dma_page_alloc_fini();
+ if (!ttm_dma_disable)
+ ttm_dma_page_alloc_fini();
flush_workqueue(glob->swap_queue);
destroy_workqueue(glob->swap_queue);
glob->swap_queue = NULL;
diff --git a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
index d6d8240..a5be62e 100644
--- a/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
+++ b/drivers/gpu/drm/ttm/ttm_page_alloc_dma.c
@@ -51,6 +51,10 @@
#include <asm/agp.h>
#endif

+int __read_mostly ttm_dma_disable;
+MODULE_PARM_DESC(no_dma, "Disable TTM DMA pool");
+module_param_named(no_dma, ttm_dma_disable, bool, S_IRUGO);
+
#define NUM_PAGES_TO_ALLOC (PAGE_SIZE/sizeof(struct page *))
#define SMALL_ALLOCATION 16
#define FREE_ALL_PAGES (~0U)
@@ -1384,7 +1388,7 @@ int ttm_dma_page_alloc_debugfs(struct seq_file *m, void *data)
EXPORT_SYMBOL_GPL(ttm_dma_page_alloc_debugfs);
bool ttm_dma_override(struct ttm_backend_func *be)
{
- if (swiotlb_nr_tbl() && be) {
+ if (swiotlb_nr_tbl() && be && !ttm_dma_disable) {
be->get_pages = &ttm_dma_get_pages;
be->put_pages = &ttm_dma_put_pages;
return true;
diff --git a/include/drm/ttm/ttm_page_alloc.h b/include/drm/ttm/ttm_page_alloc.h
index 9c52fb7..daf5db6 100644
--- a/include/drm/ttm/ttm_page_alloc.h
+++ b/include/drm/ttm/ttm_page_alloc.h
@@ -32,6 +32,7 @@
#ifdef CONFIG_SWIOTLB
extern bool ttm_dma_override(struct ttm_backend_func *be);

+extern int ttm_dma_disable;
/**
* Initialize pool allocator.
*/
@@ -45,6 +46,7 @@ void ttm_dma_page_alloc_fini(void);
*/
extern int ttm_dma_page_alloc_debugfs(struct seq_file *m, void *data);
#else
+#define ttm_dma_disable (1)
static inline bool ttm_dma_override(struct ttm_backend_func *be)
{
return false;
--
1.7.6.4


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