drm/i915: Add support for mapping an object page by page
Introduced a new vm specfic callback insert_page() to program a single pte in
ggtt or ppgtt. This allows us to map a single page in to the mappable aperture
space. This can be iterated over to access the whole object by using space as
meagre as page size.
v2: Added low level rpm assertions to insert_page routines (Chris)
v3: Added POSTING_READ post register write (Tvrtko)
v4: Rebase (Ankit)
v5: Removed wmb() and FLUSH_CTL from insert_page, caller to take care
of it (Chris)
v6: insert_page not working correctly without FLSH_CNTL write, added the
write again.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
diff --git a/include/drm/intel-gtt.h b/include/drm/intel-gtt.h
index 9e9bddaa5..f49edec 100644
--- a/include/drm/intel-gtt.h
+++ b/include/drm/intel-gtt.h
@@ -13,6 +13,9 @@
bool intel_enable_gtt(void);
void intel_gtt_chipset_flush(void);
+void intel_gtt_insert_page(dma_addr_t addr,
+ unsigned int pg,
+ unsigned int flags);
void intel_gtt_insert_sg_entries(struct sg_table *st,
unsigned int pg_start,
unsigned int flags);