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Subject[PATCH 10/11] nouveau/ttm/dma: Enable the TTM DMA pool if device can only do 32-bit DMA.
Date
If the card is capable of more than 32-bit, then use the default
TTM page pool code which allocates from anywhere in the memory.

Note: If the 'ttm.no_dma' parameter is set, the override is ignored
and the default TTM pool is used.

CC: Ben Skeggs <bskeggs@redhat.com>
CC: Francisco Jerez <currojerez@riseup.net>
CC: Dave Airlie <airlied@redhat.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
drivers/gpu/drm/nouveau/nouveau_debugfs.c | 1 +
drivers/gpu/drm/nouveau/nouveau_sgdma.c | 5 +++++
2 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_debugfs.c b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
index 8e15923..f52c2db 100644
--- a/drivers/gpu/drm/nouveau/nouveau_debugfs.c
+++ b/drivers/gpu/drm/nouveau/nouveau_debugfs.c
@@ -178,6 +178,7 @@ static struct drm_info_list nouveau_debugfs_list[] = {
{ "memory", nouveau_debugfs_memory_info, 0, NULL },
{ "vbios.rom", nouveau_debugfs_vbios_image, 0, NULL },
{ "ttm_page_pool", ttm_page_alloc_debugfs, 0, NULL },
+ { "ttm_dma_page_pool", ttm_dma_page_alloc_debugfs, 0, NULL },
};
#define NOUVEAU_DEBUGFS_ENTRIES ARRAY_SIZE(nouveau_debugfs_list)

diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
index 9b570c3..e0d4474 100644
--- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
+++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
@@ -2,6 +2,7 @@
#include "nouveau_drv.h"
#include <linux/pagemap.h>
#include <linux/slab.h>
+#include <ttm/ttm_page_alloc.h>

#define NV_CTXDMA_PAGE_SHIFT 12
#define NV_CTXDMA_PAGE_SIZE (1 << NV_CTXDMA_PAGE_SHIFT)
@@ -417,6 +418,10 @@ nouveau_sgdma_init_ttm(struct drm_device *dev)
nvbe->dev = dev;

nvbe->backend.func = dev_priv->gart_info.func;
+ if ((dev->dev) && (dma_get_mask(dev->dev) <= DMA_BIT_MASK(32))) {
+ if (ttm_dma_override(nvbe->backend.func))
+ nvbe->backend.dev = dev->dev;
+ }
return &nvbe->backend;
}

--
1.7.6.4


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