diff options
| author | Thomas Hellstrom <thomas-at-tungstengraphics-dot-com> | 2008-02-28 13:47:15 +0100 |
|---|---|---|
| committer | Thomas Hellstrom <thomas-at-tungstengraphics-dot-com> | 2008-02-28 14:06:46 +0100 |
| commit | 8ef838e5ff7b3c005d7fbc725e17bcccd0e1e1eb (patch) | |
| tree | 7c772349e4cd4a3196221a7aeee705b8238b58d6 /linux-core/drm_compat.h | |
| parent | fd595fa4dc6f788a8a1e1b56178e15f411706cb9 (diff) | |
Add a compat kmap_atomic_prot_pfn to do quick kernel map / unmaps of
PCI- or high memory.
This is substantially more efficient than drm_bo_kmap,
since the mapping only lives on a single processor.
Unmapping is done use kunmap_atomic(). Flushes only a single tlb() entry.
Add a support utility int drm_bo_pfn_prot() that returns the
pfn and desired page protection for a given bo offset.
This is all intended for relocations in bound TTMS or vram.
Mapping-accessing-unmapping must be atomic, either using preempt_xx() macros
or a spinlock.
Diffstat (limited to 'linux-core/drm_compat.h')
| -rw-r--r-- | linux-core/drm_compat.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h index f8933e0c..39027cf4 100644 --- a/linux-core/drm_compat.h +++ b/linux-core/drm_compat.h @@ -328,4 +328,9 @@ void *idr_replace(struct idr *idp, void *ptr, int id); typedef _Bool bool; #endif +#if defined(CONFIG_X86) +#define DRM_KMAP_ATOMIC_PROT_PFN +extern void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type, + pgprot_t protection); +#endif #endif |