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  1. 16 Jan, 2020 2 commits
    • Thomas Hellstrom's avatar
      mm, drm/ttm: Fix vm page protection handling · 5379e4dd
      Thomas Hellstrom authored 
      TTM graphics buffer objects may, transparently to user-space,  move
between IO and system memory. When that happens, all PTEs pointing to the
old location are zapped before the move and then faulted in again if
needed. When that happens, the page protection caching mode- and
encryption bits may change and be different from those of
struct vm_area_struct::vm_page_prot.

We were using an ugly hack to set the page protection correctly.
Fix that and instead export and use vmf_insert_mixed_prot() or use
vmf_insert_pfn_prot().
Also get the default page protection from
struct vm_area_struct::vm_page_prot rather than using vm_get_page_prot().
This way we catch modifications done by the vm system for drivers that
want write-notification.

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>
Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      5379e4dd
    • Thomas Hellstrom's avatar
      mm: Add a vmf_insert_mixed_prot() function · 574c5b3d
      Thomas Hellstrom authored 
      The TTM module today uses a hack to be able to set a different page
protection than struct vm_area_struct::vm_page_prot. To be able to do
this properly, add the needed vm functionality as vmf_insert_mixed_prot().

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>
Signed-off-by: default avatarThomas Hellstrom <thellstrom@vmware.com>
Acked-by: default avatarChristian König <christian.koenig@amd.com>
Acked-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      574c5b3d
  3. 15 Jan, 2020 38 commits
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