[Intel-gfx] [PATCH 12/15] drm/i915: Interrupt routing for GuC submission

[Dave Gordon]

Turn on interrupt steering to route necessary interrupts to GuC.

Issue: VIZ-4884
Signed-off-by: Alex Dai <yu.dai at intel.com>
Signed-off-by: Dave Gordon <david.s.gordon at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h         |   11 +++++--
 drivers/gpu/drm/i915/intel_guc_loader.c |   51 +++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 56f81de..e255253 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1638,12 +1638,18 @@ 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)
 #define   GFX_PSMI_GRANULARITY		(1<<10)
 #define   GFX_PPGTT_ENABLE		(1<<9)
 
+#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
 
@@ -5627,11 +5633,12 @@ 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 6e4667d..204777b 100644
--- a/drivers/gpu/drm/i915/intel_guc_loader.c
+++ b/drivers/gpu/drm/i915/intel_guc_loader.c
@@ -62,6 +62,53 @@
 #define I915_SKL_GUC_UCODE "i915/skl_guc_ver3.bin"
 MODULE_FIRMWARE(I915_SKL_GUC_UCODE);
 
+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_device *dev)
 {
 	/* XXX: GT type based on PCI device ID? field seems unused by fw */
@@ -390,6 +437,7 @@ int intel_guc_ucode_load(struct drm_device *dev, bool wait)
 	if (guc_fw->uc_fw_fetch_status == INTEL_UC_FIRMWARE_PENDING && !wait)
 		return -EAGAIN;
 
+	direct_interrupts_to_host(dev_priv);
 	i915_guc_submission_disable(dev);
 
 	if (guc_fw->uc_fw_fetch_status == INTEL_UC_FIRMWARE_NONE)
@@ -418,6 +466,7 @@ int intel_guc_ucode_load(struct drm_device *dev, bool wait)
 		err = i915_guc_submission_enable(dev);
 		if (err)
 			goto fail;
+		direct_interrupts_to_guc(dev_priv);
 	}
 
 	return 0;
@@ -426,6 +475,7 @@ fail:
 	if (guc_fw->uc_fw_load_status == INTEL_UC_FIRMWARE_PENDING)
 		guc_fw->uc_fw_load_status = INTEL_UC_FIRMWARE_FAIL;
 
+	direct_interrupts_to_host(dev_priv);
 	i915_guc_submission_disable(dev);
 
 	DRM_ERROR("Failed to initialize GuC, error %d\n", err);
@@ -441,6 +491,7 @@ void intel_guc_ucode_fini(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct intel_uc_fw *guc_fw = &dev_priv->guc.guc_fw;
 
+	direct_interrupts_to_host(dev_priv);
 	i915_guc_submission_fini(dev);
 
 	intel_uc_fw_fini(guc_fw);
-- 
1.7.9.5