drm/i915/gvt: Constify intel_gvt_irq_ops

These are never modified, so make them const to allow the compiler to
put them in read-only memory.
Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20211204105527.15741-4-rikard.falkeborn@gmail.comReviewed-by: Zhi Wang <zhi.a.wang@intel.com>

drivers/gpu/drm/i915/gvt/interrupt.c

@@ -176,7 +176,7 @@ int intel_vgpu_reg_imr_handler(struct intel_vgpu *vgpu,
 	unsigned int reg, void *p_data, unsigned int bytes)
 {
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct intel_gvt_irq_ops *ops = gvt->irq.ops;
+	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
 	u32 imr = *(u32 *)p_data;
 
 	trace_write_ir(vgpu->id, "IMR", reg, imr, vgpu_vreg(vgpu, reg),
@@ -206,7 +206,7 @@ int intel_vgpu_reg_master_irq_handler(struct intel_vgpu *vgpu,
 	unsigned int reg, void *p_data, unsigned int bytes)
 {
 	struct intel_gvt *gvt = vgpu->gvt;
-	struct intel_gvt_irq_ops *ops = gvt->irq.ops;
+	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
 	u32 ier = *(u32 *)p_data;
 	u32 virtual_ier = vgpu_vreg(vgpu, reg);
 
@@ -246,7 +246,7 @@ int intel_vgpu_reg_ier_handler(struct intel_vgpu *vgpu,
 {
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct drm_i915_private *i915 = gvt->gt->i915;
-	struct intel_gvt_irq_ops *ops = gvt->irq.ops;
+	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
 	struct intel_gvt_irq_info *info;
 	u32 ier = *(u32 *)p_data;
 
@@ -604,7 +604,7 @@ static void gen8_init_irq(
 	SET_BIT_INFO(irq, 25, PCU_PCODE2DRIVER_MAILBOX, INTEL_GVT_IRQ_INFO_PCU);
 }
 
-static struct intel_gvt_irq_ops gen8_irq_ops = {
+static const struct intel_gvt_irq_ops gen8_irq_ops = {
 	.init_irq = gen8_init_irq,
 	.check_pending_irq = gen8_check_pending_irq,
 };
@@ -626,7 +626,7 @@ void intel_vgpu_trigger_virtual_event(struct intel_vgpu *vgpu,
 	struct intel_gvt *gvt = vgpu->gvt;
 	struct intel_gvt_irq *irq = &gvt->irq;
 	gvt_event_virt_handler_t handler;
-	struct intel_gvt_irq_ops *ops = gvt->irq.ops;
+	const struct intel_gvt_irq_ops *ops = gvt->irq.ops;
 
 	handler = get_event_virt_handler(irq, event);
 	drm_WARN_ON(&i915->drm, !handler);

drivers/gpu/drm/i915/gvt/interrupt.h

@@ -203,7 +203,7 @@ struct intel_gvt_irq_map {
 
 /* structure containing device specific IRQ state */
 struct intel_gvt_irq {
-	struct intel_gvt_irq_ops *ops;
+	const struct intel_gvt_irq_ops *ops;
 	struct intel_gvt_irq_info *info[INTEL_GVT_IRQ_INFO_MAX];
 	DECLARE_BITMAP(irq_info_bitmap, INTEL_GVT_IRQ_INFO_MAX);
 	struct intel_gvt_event_info events[INTEL_GVT_EVENT_MAX];