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

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index 0af1483..0871c7d 100644 (file)
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -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,