drm/i915: Interrupt routing for GuC submission

Turn on interrupt steering to route necessary interrupts to GuC.

v6:
    Rebased

Issue: VIZ-4884
Signed-off-by: Alex Dai <yu.dai@intel.com>
Signed-off-by: Dave Gordon <david.s.gordon@intel.com>
Reviewed-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 651d0dd..5cdb328 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1674,6 +1674,7 @@ enum skl_disp_power_wells {
 #define GFX_MODE_GEN7  0x0229c
 #define RING_MODE_GEN7(ring)   ((ring)->mmio_base+0x29c)
 #define   GFX_RUN_LIST_ENABLE          (1<<15)
+#define   GFX_INTERRUPT_STEERING       (1<<14)
 #define   GFX_TLB_INVALIDATE_EXPLICIT  (1<<13)
 #define   GFX_SURFACE_FAULT_ENABLE     (1<<12)
 #define   GFX_REPLAY_MODE              (1<<11)
@@ -1681,6 +1682,11 @@ enum skl_disp_power_wells {
 #define   GFX_PPGTT_ENABLE             (1<<9)
 #define   GEN8_GFX_PPGTT_48B           (1<<7)
 
+#define   GFX_FORWARD_VBLANK_MASK      (3<<5)
+#define   GFX_FORWARD_VBLANK_NEVER     (0<<5)
+#define   GFX_FORWARD_VBLANK_ALWAYS    (1<<5)
+#define   GFX_FORWARD_VBLANK_COND      (2<<5)
+
 #define VLV_DISPLAY_BASE 0x180000
 #define VLV_MIPI_BASE VLV_DISPLAY_BASE
 
@@ -5695,11 +5701,12 @@ enum skl_disp_power_wells {
 #define GEN8_GT_IIR(which) (0x44308 + (0x10 * (which)))
 #define GEN8_GT_IER(which) (0x4430c + (0x10 * (which)))
 
-#define GEN8_BCS_IRQ_SHIFT 16
 #define GEN8_RCS_IRQ_SHIFT 0
-#define GEN8_VCS2_IRQ_SHIFT 16
+#define GEN8_BCS_IRQ_SHIFT 16
 #define GEN8_VCS1_IRQ_SHIFT 0
+#define GEN8_VCS2_IRQ_SHIFT 16
 #define GEN8_VECS_IRQ_SHIFT 0
+#define GEN8_WD_IRQ_SHIFT 16
 
 #define GEN8_DE_PIPE_ISR(pipe) (0x44400 + (0x10 * (pipe)))
 #define GEN8_DE_PIPE_IMR(pipe) (0x44404 + (0x10 * (pipe)))

diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
index 8b4b057..13e75f6 100644 (file)
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -79,6 +79,53 @@ const char *intel_guc_fw_status_repr(enum intel_guc_fw_status status)
        }
 };
 
+static void direct_interrupts_to_host(struct drm_i915_private *dev_priv)
+{
+       struct intel_engine_cs *ring;
+       int i, irqs;
+
+       /* tell all command streamers NOT to forward interrupts and vblank to GuC */
+       irqs = _MASKED_FIELD(GFX_FORWARD_VBLANK_MASK, GFX_FORWARD_VBLANK_NEVER);
+       irqs |= _MASKED_BIT_DISABLE(GFX_INTERRUPT_STEERING);
+       for_each_ring(ring, dev_priv, i)
+               I915_WRITE(RING_MODE_GEN7(ring), irqs);
+
+       /* tell DE to send nothing to GuC */
+       I915_WRITE(DE_GUCRMR, ~0);
+
+       /* route all GT interrupts to the host */
+       I915_WRITE(GUC_BCS_RCS_IER, 0);
+       I915_WRITE(GUC_VCS2_VCS1_IER, 0);
+       I915_WRITE(GUC_WD_VECS_IER, 0);
+}
+
+static void direct_interrupts_to_guc(struct drm_i915_private *dev_priv)
+{
+       struct intel_engine_cs *ring;
+       int i, irqs;
+
+       /* tell all command streamers to forward interrupts and vblank to GuC */
+       irqs = _MASKED_FIELD(GFX_FORWARD_VBLANK_MASK, GFX_FORWARD_VBLANK_ALWAYS);
+       irqs |= _MASKED_BIT_ENABLE(GFX_INTERRUPT_STEERING);
+       for_each_ring(ring, dev_priv, i)
+               I915_WRITE(RING_MODE_GEN7(ring), irqs);
+
+       /* tell DE to send (all) flip_done to GuC */
+       irqs = DERRMR_PIPEA_PRI_FLIP_DONE | DERRMR_PIPEA_SPR_FLIP_DONE |
+              DERRMR_PIPEB_PRI_FLIP_DONE | DERRMR_PIPEB_SPR_FLIP_DONE |
+              DERRMR_PIPEC_PRI_FLIP_DONE | DERRMR_PIPEC_SPR_FLIP_DONE;
+       /* Unmasked bits will cause GuC response message to be sent */
+       I915_WRITE(DE_GUCRMR, ~irqs);
+
+       /* route USER_INTERRUPT to Host, all others are sent to GuC. */
+       irqs = GT_RENDER_USER_INTERRUPT << GEN8_RCS_IRQ_SHIFT |
+              GT_RENDER_USER_INTERRUPT << GEN8_BCS_IRQ_SHIFT;
+       /* These three registers have the same bit definitions */
+       I915_WRITE(GUC_BCS_RCS_IER, ~irqs);
+       I915_WRITE(GUC_VCS2_VCS1_IER, ~irqs);
+       I915_WRITE(GUC_WD_VECS_IER, ~irqs);
+}
+
 static u32 get_gttype(struct drm_i915_private *dev_priv)
 {
        /* XXX: GT type based on PCI device ID? field seems unused by fw */
@@ -342,6 +389,7 @@ int intel_guc_ucode_load(struct drm_device *dev)
                intel_guc_fw_status_repr(guc_fw->guc_fw_fetch_status),
                intel_guc_fw_status_repr(guc_fw->guc_fw_load_status));
 
+       direct_interrupts_to_host(dev_priv);
        i915_guc_submission_disable(dev);
 
        if (guc_fw->guc_fw_fetch_status == GUC_FIRMWARE_NONE)
@@ -395,6 +443,7 @@ int intel_guc_ucode_load(struct drm_device *dev)
                err = i915_guc_submission_enable(dev);
                if (err)
                        goto fail;
+               direct_interrupts_to_guc(dev_priv);
        }
 
        return 0;
@@ -403,6 +452,7 @@ fail:
        if (guc_fw->guc_fw_load_status == GUC_FIRMWARE_PENDING)
                guc_fw->guc_fw_load_status = GUC_FIRMWARE_FAIL;
 
+       direct_interrupts_to_host(dev_priv);
        i915_guc_submission_disable(dev);
 
        return err;
@@ -550,6 +600,7 @@ void intel_guc_ucode_fini(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
 
+       direct_interrupts_to_host(dev_priv);
        i915_guc_submission_fini(dev);
 
        if (guc_fw->guc_fw_obj)