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[04/18] drm/i915/gtt: Invalidate GGTT caches after writing the gen6 page directories

Message ID 20180608125602.17693-5-chris@chris-wilson.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Chris Wilson June 8, 2018, 12:55 p.m. UTC
When we update the gen6 ppgtt page directories, we do so by writing the
new address into a reserved slot in the GGTT. It appears that when the
GPU reads that entry from the gsm, it uses its small cache and that we
need to invalidate that cache after writing. We don't see an issue
currently as we prefill the ppgtt page directories on creation; and only
create the single aliasing_ppgtt long before we start using the GGTT
(and so before the cache mayhave a conflicting entry).

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
---
 drivers/gpu/drm/i915/i915_gem_gtt.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 6ac6520b6e9c..091251c0e7fc 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -1693,8 +1693,8 @@  static inline void gen6_write_pde(const struct i915_hw_ppgtt *ppgtt,
 				  const struct i915_page_table *pt)
 {
 	/* Caller needs to make sure the write completes if necessary */
-	writel_relaxed(GEN6_PDE_ADDR_ENCODE(px_dma(pt)) | GEN6_PDE_VALID,
-		       ppgtt->pd_addr + pde);
+	iowrite32(GEN6_PDE_ADDR_ENCODE(px_dma(pt)) | GEN6_PDE_VALID,
+		  ppgtt->pd_addr + pde);
 }
 
 /* Write all the page tables found in the ppgtt structure to incrementing page
@@ -1709,7 +1709,7 @@  static void gen6_write_page_range(struct i915_hw_ppgtt *ppgtt,
 		gen6_write_pde(ppgtt, pde, pt);
 
 	mark_tlbs_dirty(ppgtt);
-	wmb();
+	gen6_ggtt_invalidate(ppgtt->vm.i915);
 }
 
 static inline u32 get_pd_offset(struct i915_hw_ppgtt *ppgtt)
@@ -1925,7 +1925,7 @@  static int gen6_alloc_va_range(struct i915_address_space *vm,
 
 	if (flush) {
 		mark_tlbs_dirty(ppgtt);
-		wmb();
+		gen6_ggtt_invalidate(ppgtt->vm.i915);
 	}
 
 	return 0;