drm/i915: Provide PDP updates via MMIO

The initial implementation of this function used MMIO to write the PDPs.
Upon review it was determined (correctly) that the docs say to use LRI.
The issue is there are times where we want to do a synchronous write
(GPU reset).

I've tested this, and it works. I've verified with as many people as
possible that it should work.

This should fix the failing reset problems.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 056f1f0e2772adca686620f77539af542f54a05b..056033791d243414fe7e4e8f2e192267ab550b2e 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -197,12 +197,19 @@ static gen6_gtt_pte_t iris_pte_encode(dma_addr_t addr,
 
 /* Broadwell Page Directory Pointer Descriptors */
 static int gen8_write_pdp(struct intel_ring_buffer *ring, unsigned entry,
-                          uint64_t val)
+                          uint64_t val, bool synchronous)
 {
+       struct drm_i915_private *dev_priv = ring->dev->dev_private;
        int ret;
 
        BUG_ON(entry >= 4);
 
+       if (synchronous) {
+               I915_WRITE(GEN8_RING_PDP_UDW(ring, entry), val >> 32);
+               I915_WRITE(GEN8_RING_PDP_LDW(ring, entry), (u32)val);
+               return 0;
+       }
+
        ret = intel_ring_begin(ring, 6);
        if (ret)
                return ret;
@@ -236,7 +243,8 @@ static int gen8_ppgtt_enable(struct drm_device *dev)
        for (i = used_pd - 1; i >= 0; i--) {
                dma_addr_t addr = ppgtt->pd_dma_addr[i];
                for_each_ring(ring, dev_priv, j) {
-                       ret = gen8_write_pdp(ring, i, addr);
+                       ret = gen8_write_pdp(ring, i, addr,
+                                            i915_reset_in_progress(&dev_priv->gpu_error));
                        if (ret)
                                goto err_out;
                }