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drm/radeon: only enable swiotlb path when need v2 

swiotlb expands our card accessing range, but its path always is slower
than ttm pool allocation.
So add condition to use it.
v2: move a bit later

Signed-off-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180209024410.1469-3-david1.zhou@amd.com
This commit is contained in:
Chunming Zhou 2018-02-09 10:44:10 +08:00 committed by Alex Deucher
parent fd5fd480dd
commit 1bc3d3cce8
3 changed files with 6 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/radeon/radeon.h
View File

@ -2387,6 +2387,7 @@ struct radeon_device {
struct radeon_dummy_page dummy_page;
bool shutdown;
bool need_dma32;
bool need_swiotlb;
bool accel_working;
bool fastfb_working; /* IGP feature*/
bool needs_reset, in_reset;

2
drivers/gpu/drm/radeon/radeon_device.c
View File

@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_cache.h>
#include <drm/radeon_drm.h>
#include <linux/pm_runtime.h>
#include <linux/vgaarb.h>
@ -1378,6 +1379,7 @@ int radeon_device_init(struct radeon_device *rdev,
pci_set_consistent_dma_mask(rdev->pdev, DMA_BIT_MASK(32));
pr_warn("radeon: No coherent DMA available\n");
}
rdev->need_swiotlb = drm_get_max_iomem() > ((u64)1 << dma_bits);
/* Registers mapping */
/* TODO: block userspace mapping of io register */

6
drivers/gpu/drm/radeon/radeon_ttm.c
View File

@ -756,7 +756,7 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm,
#endif
#ifdef CONFIG_SWIOTLB
if (swiotlb_nr_tbl()) {
if (rdev->need_swiotlb && swiotlb_nr_tbl()) {
return ttm_dma_populate(&gtt->ttm, rdev->dev, ctx);
}
#endif
@ -788,7 +788,7 @@ static void radeon_ttm_tt_unpopulate(struct ttm_tt *ttm)
#endif
#ifdef CONFIG_SWIOTLB
if (swiotlb_nr_tbl()) {
if (rdev->need_swiotlb && swiotlb_nr_tbl()) {
ttm_dma_unpopulate(&gtt->ttm, rdev->dev);
return;
}
@ -1155,7 +1155,7 @@ static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
count = ARRAY_SIZE(radeon_ttm_debugfs_list);
#ifdef CONFIG_SWIOTLB
if (!swiotlb_nr_tbl())
if (!(rdev->need_swiotlb && swiotlb_nr_tbl()))
--count;
#endif