Merge tag 'drm-intel-fixes-2018-05-17' of git://anongit.freedesktop.org/drm/drm-intel into drm-fixes

- Userptr IOCTL zero size check (Matt)
- Two hardware quirk fixes (Michel & Chris)

* tag 'drm-intel-fixes-2018-05-17' of git://anongit.freedesktop.org/drm/drm-intel:
  drm/i915/gen9: Add WaClearHIZ_WM_CHICKEN3 for bxt and glk
  drm/i915/execlists: Use rmb() to order CSB reads
  drm/i915/userptr: reject zero user_size

drivers/gpu/drm/i915/i915_gem_userptr.c

@@ -778,6 +778,9 @@ i915_gem_userptr_ioctl(struct drm_device *dev,
 			    I915_USERPTR_UNSYNCHRONIZED))
 		return -EINVAL;
 
+	if (!args->user_size)
+		return -EINVAL;
+
 	if (offset_in_page(args->user_ptr | args->user_size))
 		return -EINVAL;
 

drivers/gpu/drm/i915/i915_reg.h

@@ -7326,6 +7326,9 @@ enum {
 #define SLICE_ECO_CHICKEN0			_MMIO(0x7308)
 #define   PIXEL_MASK_CAMMING_DISABLE		(1 << 14)
 
+#define GEN9_WM_CHICKEN3			_MMIO(0x5588)
+#define   GEN9_FACTOR_IN_CLR_VAL_HIZ		(1 << 9)
+
 /* WaCatErrorRejectionIssue */
 #define GEN7_SQ_CHICKEN_MBCUNIT_CONFIG		_MMIO(0x9030)
 #define  GEN7_SQ_CHICKEN_MBCUNIT_SQINTMOB	(1<<11)

drivers/gpu/drm/i915/intel_engine_cs.c

@@ -1149,6 +1149,10 @@ static int gen9_init_workarounds(struct intel_engine_cs *engine)
 	WA_SET_FIELD_MASKED(GEN8_CS_CHICKEN1, GEN9_PREEMPT_GPGPU_LEVEL_MASK,
 			    GEN9_PREEMPT_GPGPU_COMMAND_LEVEL);
 
+	/* WaClearHIZ_WM_CHICKEN3:bxt,glk */
+	if (IS_GEN9_LP(dev_priv))
+		WA_SET_BIT_MASKED(GEN9_WM_CHICKEN3, GEN9_FACTOR_IN_CLR_VAL_HIZ);
+
 	/* WaVFEStateAfterPipeControlwithMediaStateClear:skl,bxt,glk,cfl */
 	ret = wa_ring_whitelist_reg(engine, GEN9_CTX_PREEMPT_REG);
 	if (ret)

drivers/gpu/drm/i915/intel_lrc.c

@@ -884,6 +884,7 @@ static void execlists_submission_tasklet(unsigned long data)
 
 			head = execlists->csb_head;
 			tail = READ_ONCE(buf[write_idx]);
+			rmb(); /* Hopefully paired with a wmb() in HW */
 		}
 		GEM_TRACE("%s cs-irq head=%d [%d%s], tail=%d [%d%s]\n",
 			  engine->name,