Am 04.03.21 um 18:40 schrieb Bhardwaj, Rajneesh:
On 3/4/2021 12:31 PM, Christian König wrote:
[CAUTION: External Email]
Am 04.03.21 um 18:01 schrieb Bhardwaj, Rajneesh:
I was wondering if a managed version of such API exists but looks like
none. We only have devm_ioremap_wc but that is valid only for
PAGE_CACHE_MODE_WC whereas ioremap_cache uses _WB. One more small
comment below.
Acked-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@xxxxxxx>
On 3/4/2021 11:04 AM, Oak Zeng wrote:
If tbo.mem.bus.caching is cached, buffer is intended to be mapped
as cached from CPU. Map it with ioremap_cache.
This wasn't necessary before as device memory was never mapped
as cached from CPU side. It becomes necessary for aldebaran as
device memory is mapped cached from CPU.
Signed-off-by: Oak Zeng <Oak.Zeng@xxxxxxx>
Reviewed-by: Christian Konig <Christian.Koenig@xxxxxxx>
---
drivers/gpu/drm/ttm/ttm_bo_util.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c
b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 031e581..7429464 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -91,6 +91,10 @@ static int ttm_resource_ioremap(struct ttm_device
*bdev,
if (mem->bus.caching == ttm_write_combined)
addr = ioremap_wc(mem->bus.offset, bus_size);
+#ifdef CONFIG_X86
Please use #if defined (CONFIG_X86)
Actually #ifdef is usually preferred.
oops, i was referring to IS_ENABLED (CONFIG) and not if defined.
Well, that is indeed a good idea for most config options.
But in this case #ifdef alone should work as well.
Christian.
Christian.
+ else if (mem->bus.caching == ttm_cached)
+ addr = ioremap_cache(mem->bus.offset, bus_size);
+#endif
else
addr = ioremap(mem->bus.offset, bus_size);
if (!addr) {
@@ -372,6 +376,11 @@ static int ttm_bo_ioremap(struct
ttm_buffer_object *bo,
if (mem->bus.caching == ttm_write_combined)
map->virtual = ioremap_wc(bo->mem.bus.offset + offset,
size);
+#ifdef CONFIG_X86
+ else if (mem->bus.caching == ttm_cached)
+ map->virtual = ioremap_cache(bo->mem.bus.offset + offset,
+ size);
+#endif
else
map->virtual = ioremap(bo->mem.bus.offset + offset,
size);
@@ -490,6 +499,11 @@ int ttm_bo_vmap(struct ttm_buffer_object *bo,
struct dma_buf_map *map)
else if (mem->bus.caching == ttm_write_combined)
vaddr_iomem = ioremap_wc(mem->bus.offset,
bo->base.size);
+ else if (mem->bus.caching == ttm_cached)
+#ifdef CONFIG_X86
+ vaddr_iomem = ioremap_cache(mem->bus.offset,
+ bo->base.size);
+#endif
else
vaddr_iomem = ioremap(mem->bus.offset, bo->base.size);
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