drm/xe/vf: Add VF specific interrupt handler

There are small differences in handling of the register based
interrupts on the VF driver as some registers are not accessible
to the VF driver. Additionally VFs must support Memory Based
Interrupts. Add VF specific interrupt handler for this.

Cc: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://lore.kernel.org/r/20231214185955.1791-11-michal.wajdeczko@intel.comSigned-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>

drivers/gpu/drm/xe/xe_irq.c

@@ -17,7 +17,9 @@
 #include "xe_gt.h"
 #include "xe_guc.h"
 #include "xe_hw_engine.h"
+#include "xe_memirq.h"
 #include "xe_mmio.h"
+#include "xe_sriov.h"
 
 /*
  * Interrupt registers for a unit are always consecutive and ordered
@@ -498,6 +500,9 @@ static void xelp_irq_reset(struct xe_tile *tile)
 
 	gt_irq_reset(tile);
 
+	if (IS_SRIOV_VF(tile_to_xe(tile)))
+		return;
+
 	mask_and_disable(tile, PCU_IRQ_OFFSET);
 }
 
@@ -508,6 +513,9 @@ static void dg1_irq_reset(struct xe_tile *tile)
 
 	gt_irq_reset(tile);
 
+	if (IS_SRIOV_VF(tile_to_xe(tile)))
+		return;
+
 	mask_and_disable(tile, PCU_IRQ_OFFSET);
 }
 
@@ -518,11 +526,34 @@ static void dg1_irq_reset_mstr(struct xe_tile *tile)
 	xe_mmio_write32(mmio, GFX_MSTR_IRQ, ~0);
 }
 
+static void vf_irq_reset(struct xe_device *xe)
+{
+	struct xe_tile *tile;
+	unsigned int id;
+
+	xe_assert(xe, IS_SRIOV_VF(xe));
+
+	if (GRAPHICS_VERx100(xe) < 1210)
+		xelp_intr_disable(xe);
+	else
+		xe_assert(xe, xe_device_has_memirq(xe));
+
+	for_each_tile(tile, xe, id) {
+		if (xe_device_has_memirq(xe))
+			xe_memirq_reset(&tile->sriov.vf.memirq);
+		else
+			gt_irq_reset(tile);
+	}
+}
+
 static void xe_irq_reset(struct xe_device *xe)
 {
 	struct xe_tile *tile;
 	u8 id;
 
+	if (IS_SRIOV_VF(xe))
+		return vf_irq_reset(xe);
+
 	for_each_tile(tile, xe, id) {
 		if (GRAPHICS_VERx100(xe) >= 1210)
 			dg1_irq_reset(tile);
@@ -545,8 +576,26 @@ static void xe_irq_reset(struct xe_device *xe)
 	}
 }
 
+static void vf_irq_postinstall(struct xe_device *xe)
+{
+	struct xe_tile *tile;
+	unsigned int id;
+
+	for_each_tile(tile, xe, id)
+		if (xe_device_has_memirq(xe))
+			xe_memirq_postinstall(&tile->sriov.vf.memirq);
+
+	if (GRAPHICS_VERx100(xe) < 1210)
+		xelp_intr_enable(xe, true);
+	else
+		xe_assert(xe, xe_device_has_memirq(xe));
+}
+
 static void xe_irq_postinstall(struct xe_device *xe)
 {
+	if (IS_SRIOV_VF(xe))
+		return vf_irq_postinstall(xe);
+
 	xe_display_irq_postinstall(xe, xe_root_mmio_gt(xe));
 
 	/*
@@ -563,8 +612,30 @@ static void xe_irq_postinstall(struct xe_device *xe)
 		xelp_intr_enable(xe, true);
 }
 
+static irqreturn_t vf_mem_irq_handler(int irq, void *arg)
+{
+	struct xe_device *xe = arg;
+	struct xe_tile *tile;
+	unsigned int id;
+
+	spin_lock(&xe->irq.lock);
+	if (!xe->irq.enabled) {
+		spin_unlock(&xe->irq.lock);
+		return IRQ_NONE;
+	}
+	spin_unlock(&xe->irq.lock);
+
+	for_each_tile(tile, xe, id)
+		xe_memirq_handler(&tile->sriov.vf.memirq);
+
+	return IRQ_HANDLED;
+}
+
 static irq_handler_t xe_irq_handler(struct xe_device *xe)
 {
+	if (IS_SRIOV_VF(xe) && xe_device_has_memirq(xe))
+		return vf_mem_irq_handler;
+
 	if (GRAPHICS_VERx100(xe) >= 1210)
 		return dg1_irq_handler;
 	else