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drm/ttm: Temporarily disable the huge_fault() callback 

With amdgpu and CONFIG_TRANSPARENT_HUGEPAGE_ALWAYS=y, there are
errors like:
BUG: non-zero pgtables_bytes on freeing mm
and:
BUG: Bad rss-counter state
with TTM transparent huge-pages.
Until we've figured out what other TTM drivers do differently compared to
vmwgfx, disable the huge_fault() callback, eliminating transhuge
page-table entries.

Cc: Christian König <christian.koenig@amd.com>
Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@shipmail.org>
Reported-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Tested-by: Alex Xu (Hello71) <alex_y_xu@yahoo.ca>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200409164925.11912-1-thomas_os@shipmail.org
This commit is contained in:
Thomas Hellstrom (VMware) 2020-04-09 18:49:25 +02:00 коммит произвёл Dave Airlie
Родитель cb6d406641
Коммит c445c1668d
1 изменённых файлов: 0 добавлений и 63 удалений
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63
drivers/gpu/drm/ttm/ttm_bo_vm.c
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@ -436,66 +436,6 @@ vm_fault_t ttm_bo_vm_fault(struct vm_fault *vmf)
}
EXPORT_SYMBOL(ttm_bo_vm_fault);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/**
* ttm_pgprot_is_wrprotecting - Is a page protection value write-protecting?
* @prot: The page protection value
*
* Return: true if @prot is write-protecting. false otherwise.
*/
static bool ttm_pgprot_is_wrprotecting(pgprot_t prot)
{
/*
* This is meant to say "pgprot_wrprotect(prot) == prot" in a generic
* way. Unfortunately there is no generic pgprot_wrprotect.
*/
return pte_val(pte_wrprotect(__pte(pgprot_val(prot)))) ==
pgprot_val(prot);
}
static vm_fault_t ttm_bo_vm_huge_fault(struct vm_fault *vmf,
enum page_entry_size pe_size)
{
struct vm_area_struct *vma = vmf->vma;
pgprot_t prot;
struct ttm_buffer_object *bo = vma->vm_private_data;
vm_fault_t ret;
pgoff_t fault_page_size = 0;
bool write = vmf->flags & FAULT_FLAG_WRITE;
switch (pe_size) {
case PE_SIZE_PMD:
fault_page_size = HPAGE_PMD_SIZE >> PAGE_SHIFT;
break;
#ifdef CONFIG_HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD
case PE_SIZE_PUD:
fault_page_size = HPAGE_PUD_SIZE >> PAGE_SHIFT;
break;
#endif
default:
WARN_ON_ONCE(1);
return VM_FAULT_FALLBACK;
}
/* Fallback on write dirty-tracking or COW */
if (write && ttm_pgprot_is_wrprotecting(vma->vm_page_prot))
return VM_FAULT_FALLBACK;
ret = ttm_bo_vm_reserve(bo, vmf);
if (ret)
return ret;
prot = vm_get_page_prot(vma->vm_flags);
ret = ttm_bo_vm_fault_reserved(vmf, prot, 1, fault_page_size);
if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
return ret;
dma_resv_unlock(bo->base.resv);
return ret;
}
#endif
void ttm_bo_vm_open(struct vm_area_struct *vma)
{
struct ttm_buffer_object *bo = vma->vm_private_data;
@ -598,9 +538,6 @@ static const struct vm_operations_struct ttm_bo_vm_ops = {
.open = ttm_bo_vm_open,
.close = ttm_bo_vm_close,
.access = ttm_bo_vm_access,
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
.huge_fault = ttm_bo_vm_huge_fault,
#endif
};
static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev,