drm/i915: fix up semaphore_waits_for

There's an entire pile of issues in here:

- Use the main RING_HEAD register, not ACTHD. ACTHD points at the gtt
  offset of the batch buffer when a batch is executed. Semaphores are
  always emitted to the main ring, so we always want to look at that.

- Mask the obtained HEAD pointer with the actual ring size, which is
  much smaller. Together with the above issue this resulted us in
  trying to dereference a pointer way outside of the ring mmio
  mapping. The resulting invalid access in interrupt context
  (hangcheck is executed from timers) lead to a full blown kernel
  panic. The fbcon panic handler then tried to frob our driver harder,
  resulting in a full machine hang at least on my snb here where I've
  stumbled over this.

- Handle ring wrapping correctly and be a bit more explicit about how
  many dwords we're scanning. We probably should also scan more than
  just 4 ...

- Space out some of teh computations for readability.

This reduces hard-hangs on my snb here. Mika and QA both say that it
doesn't completel remove them, but at least for me it's a clear
improvement in stability.

Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
References: https://bugs.freedesktop.org/show_bug.cgi?id=74100
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 26 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index acf1ab3ff0d9..9ef241fb86b3 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2530,29 +2530,43 @@ static struct intel_ring_buffer *
 semaphore_waits_for(struct intel_ring_buffer *ring, u32 *seqno)
 {
         struct drm_i915_private *dev_priv = ring->dev->dev_private;
-        u32 cmd, ipehr, acthd, acthd_min;
+        u32 cmd, ipehr, head;
+        int i;
 
         ipehr = I915_READ(RING_IPEHR(ring->mmio_base));
         if ((ipehr & ~(0x3 << 16)) !=
             (MI_SEMAPHORE_MBOX | MI_SEMAPHORE_COMPARE | MI_SEMAPHORE_REGISTER))
                 return NULL;
 
-        /* ACTHD is likely pointing to the dword after the actual command,
-         * so scan backwards until we find the MBOX.
+        /*
+         * HEAD is likely pointing to the dword after the actual command,
+         * so scan backwards until we find the MBOX. But limit it to just 3
+         * dwords. Note that we don't care about ACTHD here since that might
+         * point at at batch, and semaphores are always emitted into the
+         * ringbuffer itself.
          */
-        acthd = intel_ring_get_active_head(ring) & HEAD_ADDR;
-        acthd_min = max((int)acthd - 3 * 4, 0);
-        do {
-                cmd = ioread32(ring->virtual_start + acthd);
+        head = I915_READ_HEAD(ring) & HEAD_ADDR;
+
+        for (i = 4; i; --i) {
+                /*
+                 * Be paranoid and presume the hw has gone off into the wild -
+                 * our ring is smaller than what the hardware (and hence
+                 * HEAD_ADDR) allows. Also handles wrap-around.
+                 */
+                head &= ring->size - 1;
+
+                /* This here seems to blow up */
+                cmd = ioread32(ring->virtual_start + head);
                 if (cmd == ipehr)
                         break;
 
-                acthd -= 4;
-                if (acthd < acthd_min)
-                        return NULL;
-        } while (1);
+                head -= 4;
+        }
+
+        if (!i)
+                return NULL;
 
-        *seqno = ioread32(ring->virtual_start+acthd+4)+1;
+        *seqno = ioread32(ring->virtual_start + head + 4) + 1;
         return &dev_priv->ring[(ring->id + (((ipehr >> 17) & 1) + 1)) % 3];
 }