drm/i915: Support for GuC interrupts
There are certain types of interrupts which Host can receive from GuC.
GuC ukernel sends an interrupt to Host for certain events, like for
example retrieve/consume the logs generated by ukernel.
This patch adds support to receive interrupts from GuC but currently
enables & partially handles only the interrupt sent by GuC ukernel.
Future patches will add support for handling other interrupt types.
v2:
- Use common low level routines for PM IER/IIR programming (Chris)
- Rename interrupt functions to gen9_xxx from gen8_xxx (Chris)
- Replace disabling of wake ref asserts with rpm get/put (Chris)
v3:
- Update comments for more clarity. (Tvrtko)
- Remove the masking of GuC interrupt, which was kept masked till the
start of bottom half, its not really needed as there is only a
single instance of work item & wq is ordered. (Tvrtko)
v4:
- Rebase.
- Rename guc_events to pm_guc_events so as to be indicative of the
register/control block it is associated with. (Chris)
- Add handling for back to back log buffer flush interrupts.
v5:
- Move the read & clearing of register, containing Guc2Host message
bits, outside the irq spinlock. (Tvrtko)
v6:
- Move the log buffer flush interrupt related stuff to the following
patch so as to do only generic bits in this patch. (Tvrtko)
- Rebase.
v7:
- Remove the interrupts_enabled check from gen9_guc_irq_handler, want to
process that last interrupt also before disabling the interrupt, sync
against the work queued by irq handler will be done by caller disabling
the interrupt.
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Signed-off-by: Akash Goel <akash.goel@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index a9be3f0..bdc7b35 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6016,6 +6016,7 @@ enum {
#define GEN8_DE_PIPE_A_IRQ (1<<16)
#define GEN8_DE_PIPE_IRQ(pipe) (1<<(16+(pipe)))
#define GEN8_GT_VECS_IRQ (1<<6)
+#define GEN8_GT_GUC_IRQ (1<<5)
#define GEN8_GT_PM_IRQ (1<<4)
#define GEN8_GT_VCS2_IRQ (1<<3)
#define GEN8_GT_VCS1_IRQ (1<<2)
@@ -6027,6 +6028,16 @@ enum {
#define GEN8_GT_IIR(which) _MMIO(0x44308 + (0x10 * (which)))
#define GEN8_GT_IER(which) _MMIO(0x4430c + (0x10 * (which)))
+#define GEN9_GUC_TO_HOST_INT_EVENT (1<<31)
+#define GEN9_GUC_EXEC_ERROR_EVENT (1<<30)
+#define GEN9_GUC_DISPLAY_EVENT (1<<29)
+#define GEN9_GUC_SEMA_SIGNAL_EVENT (1<<28)
+#define GEN9_GUC_IOMMU_MSG_EVENT (1<<27)
+#define GEN9_GUC_DB_RING_EVENT (1<<26)
+#define GEN9_GUC_DMA_DONE_EVENT (1<<25)
+#define GEN9_GUC_FATAL_ERROR_EVENT (1<<24)
+#define GEN9_GUC_NOTIFICATION_EVENT (1<<23)
+
#define GEN8_RCS_IRQ_SHIFT 0
#define GEN8_BCS_IRQ_SHIFT 16
#define GEN8_VCS1_IRQ_SHIFT 0