On Fri, Jun 22, 2012 at 1:25 PM, Lucas Stach <dev@xxxxxxxxxx> wrote:
> Hello Huacai,
>
> Am Freitag, den 22.06.2012, 11:01 +0800 schrieb Huacai Chen:
>> 1, Handle io prot correctly for MIPS.
>> 2, Define SAREA_MAX as the size of one page.
>> 3, Don't use swiotlb on Loongson machines (Loonson need swioitlb, but
>> when use swiotlb, GPU reset occurs at resume from suspend).
>>
> I still think this is wrong. You say Loongson needs SWIOTLB, but when
> it's actually used you ignore it in the radeon driver code.
>
> I looked up why you are using SWIOTLB and I don't agree with you that it
> is needed. SWIOTLB just gives you bounce pages for DMA memory above
> DMA32 and therefore papers over your >4GB DMA platform bug in some
> cases, while hurting performance.
>
> Please fix your DMA platform code so that region DMA is an alias for
> region DMA32. It should allow you to drop all those ugly workarounds.
>
Hi, Lucas, I disable SWIOTLB and still make sure DMA <4G, radeon and
sound card seems work fine, but OHCI still can't work. From git log
arch/mips/cavium-octeon/dma-octeon.c, it seems Cavium also need
SWIOTLB to avoid OHCI issue.
>> Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
>> Signed-off-by: Hongliang Tao <taohl@xxxxxxxxxx>
>> Signed-off-by: Hua Yan <yanh@xxxxxxxxxx>
>> Reviewed-by: Michel Dänzer <michel@xxxxxxxxxxx>
>> Reviewed-by: Alex Deucher <alexdeucher@xxxxxxxxx>
>> Reviewed-by: Lucas Stach <dev@xxxxxxxxxx>
>> Reviewed-by: j.glisse <j.glisse@xxxxxxxxx>
>
> You should probably only stick this tag on your patches after the people
> you are naming explicitly gave their r-b for a specific version of a
> patch.
>
> Thanks,
> Lucas
>> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
>> ---
>> drivers/gpu/drm/drm_vm.c | 2 +-
>> drivers/gpu/drm/radeon/radeon_ttm.c | 6 +++---
>> drivers/gpu/drm/ttm/ttm_bo_util.c | 2 +-
>> include/drm/drm_sarea.h | 2 ++
>> 4 files changed, 7 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_vm.c b/drivers/gpu/drm/drm_vm.c
>> index 961ee08..3f06166 100644
>> --- a/drivers/gpu/drm/drm_vm.c
>> +++ b/drivers/gpu/drm/drm_vm.c
>> @@ -62,7 +62,7 @@ static pgprot_t drm_io_prot(uint32_t map_type, struct vm_area_struct *vma)
>> tmp = pgprot_writecombine(tmp);
>> else
>> tmp = pgprot_noncached(tmp);
>> -#elif defined(__sparc__) || defined(__arm__)
>> +#elif defined(__sparc__) || defined(__arm__) || defined(__mips__)
>> tmp = pgprot_noncached(tmp);
>> #endif
>> return tmp;
>> diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
>> index c94a225..f49bdd1 100644
>> --- a/drivers/gpu/drm/radeon/radeon_ttm.c
>> +++ b/drivers/gpu/drm/radeon/radeon_ttm.c
>> @@ -630,7 +630,7 @@ static int radeon_ttm_tt_populate(struct ttm_tt *ttm)
>> }
>> #endif
>>
>> -#ifdef CONFIG_SWIOTLB
>> +#if defined(CONFIG_SWIOTLB) && !defined(CONFIG_CPU_LOONGSON3)
>> if (swiotlb_nr_tbl()) {
>> return ttm_dma_populate(>t->ttm, rdev->dev);
>> }
>> @@ -676,7 +676,7 @@ static void radeon_ttm_tt_unpopulate(struct ttm_tt *ttm)
>> }
>> #endif
>>
>> -#ifdef CONFIG_SWIOTLB
>> +#if defined(CONFIG_SWIOTLB) && !defined(CONFIG_CPU_LOONGSON3)
>> if (swiotlb_nr_tbl()) {
>> ttm_dma_unpopulate(>t->ttm, rdev->dev);
>> return;
>> @@ -906,7 +906,7 @@ static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
>> radeon_mem_types_list[i].show = &ttm_page_alloc_debugfs;
>> radeon_mem_types_list[i].driver_features = 0;
>> radeon_mem_types_list[i++].data = NULL;
>> -#ifdef CONFIG_SWIOTLB
>> +#if defined(CONFIG_SWIOTLB) && !defined(CONFIG_CPU_LOONGSON3)
>> if (swiotlb_nr_tbl()) {
>> sprintf(radeon_mem_types_names[i], "ttm_dma_page_pool");
>> radeon_mem_types_list[i].name = radeon_mem_types_names[i];
>> diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
>> index f8187ea..0df71ea 100644
>> --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
>> +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
>> @@ -472,7 +472,7 @@ pgprot_t ttm_io_prot(uint32_t caching_flags, pgprot_t tmp)
>> else
>> tmp = pgprot_noncached(tmp);
>> #endif
>> -#if defined(__sparc__)
>> +#if defined(__sparc__) || defined(__mips__)
>> if (!(caching_flags & TTM_PL_FLAG_CACHED))
>> tmp = pgprot_noncached(tmp);
>> #endif
>> diff --git a/include/drm/drm_sarea.h b/include/drm/drm_sarea.h
>> index ee5389d..1d1a858 100644
>> --- a/include/drm/drm_sarea.h
>> +++ b/include/drm/drm_sarea.h
>> @@ -37,6 +37,8 @@
>> /* SAREA area needs to be at least a page */
>> #if defined(__alpha__)
>> #define SAREA_MAX 0x2000U
>> +#elif defined(__mips__)
>> +#define SAREA_MAX 0x4000U
>> #elif defined(__ia64__)
>> #define SAREA_MAX 0x10000U /* 64kB */
>> #else
>
>
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