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drm/vmwgfx: Support huge page faults

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With vmwgfx dirty-tracking we need a specialized huge_fault
callback. Implement and hook it up.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: "Jérôme Glisse" <jglisse@redhat.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Hellstrom (VMware) <thomas_os@shipmail.org>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>
Acked-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Thomas Hellstrom (VMware) 2020-03-24 18:48:55 +01:00
parent 314b6580ad
commit 75390281ab
3 changed files with 81 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
View File

@ -1402,6 +1402,10 @@ void vmw_bo_dirty_unmap(struct vmw_buffer_object *vbo,
pgoff_t start, pgoff_t end);
vm_fault_t vmw_bo_vm_fault(struct vm_fault *vmf);
vm_fault_t vmw_bo_vm_mkwrite(struct vm_fault *vmf);
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
vm_fault_t vmw_bo_vm_huge_fault(struct vm_fault *vmf,
enum page_entry_size pe_size);
#endif
/**
* VMW_DEBUG_KMS - Debug output for kernel mode-setting

74
drivers/gpu/drm/vmwgfx/vmwgfx_page_dirty.c
View File

@ -473,7 +473,7 @@ vm_fault_t vmw_bo_vm_fault(struct vm_fault *vmf)
* a lot of unnecessary write faults.
*/
if (vbo->dirty && vbo->dirty->method == VMW_BO_DIRTY_MKWRITE)
prot = vma->vm_page_prot;
prot = vm_get_page_prot(vma->vm_flags & ~VM_SHARED);
else
prot = vm_get_page_prot(vma->vm_flags);
@ -486,3 +486,75 @@ out_unlock:
return ret;
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
vm_fault_t vmw_bo_vm_huge_fault(struct vm_fault *vmf,
enum page_entry_size pe_size)
{
struct vm_area_struct *vma = vmf->vma;
struct ttm_buffer_object *bo = (struct ttm_buffer_object *)
vma->vm_private_data;
struct vmw_buffer_object *vbo =
container_of(bo, struct vmw_buffer_object, base);
pgprot_t prot;
vm_fault_t ret;
pgoff_t fault_page_size;
bool write = vmf->flags & FAULT_FLAG_WRITE;
bool is_cow_mapping =
(vma->vm_flags & (VM_SHARED | VM_MAYWRITE)) == VM_MAYWRITE;
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;
}
/* Always do write dirty-tracking and COW on PTE level. */
if (write && (READ_ONCE(vbo->dirty) || is_cow_mapping))
return VM_FAULT_FALLBACK;
ret = ttm_bo_vm_reserve(bo, vmf);
if (ret)
return ret;
if (vbo->dirty) {
pgoff_t allowed_prefault;
unsigned long page_offset;
page_offset = vmf->pgoff -
drm_vma_node_start(&bo->base.vma_node);
if (page_offset >= bo->num_pages ||
vmw_resources_clean(vbo, page_offset,
page_offset + PAGE_SIZE,
&allowed_prefault)) {
ret = VM_FAULT_SIGBUS;
goto out_unlock;
}
/*
* Write protect, so we get a new fault on write, and can
* split.
*/
prot = vm_get_page_prot(vma->vm_flags & ~VM_SHARED);
} else {
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;
out_unlock:
dma_resv_unlock(bo->base.resv);
return ret;
}
#endif

5
drivers/gpu/drm/vmwgfx/vmwgfx_ttm_glue.c
View File

@ -34,7 +34,10 @@ int vmw_mmap(struct file *filp, struct vm_area_struct *vma)
.page_mkwrite = vmw_bo_vm_mkwrite,
.fault = vmw_bo_vm_fault,
.open = ttm_bo_vm_open,
.close = ttm_bo_vm_close
.close = ttm_bo_vm_close,
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
.huge_fault = vmw_bo_vm_huge_fault,
#endif
};
struct drm_file *file_priv = filp->private_data;
struct vmw_private *dev_priv = vmw_priv(file_priv->minor->dev);