drm/i915/irq: use a dedicated IMR cache for gen 5-7

There are three groups of platforms using i915->irq_mask independently:
gen 2-4, VLV/CHV, and gen 5-7.

The gen 5-7 usage is primarily limited to display. Move its irq_mask
usage to struct intel_display as ilk_de_imr_mask for gen 5-7.

ilk_de_imr_mask could be put inside a union with with vlv_imr_mask and
de_irq_mask[], but keep them separate to avoid accidental aliasing of
the values.

With this, we can also drop the irq_mask member from struct xe_device.

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://lore.kernel.org/r/adf60e74b890d52dd20ab4673111ae2063d33b49.1758198300.git.jani.nikula@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>

4 files changed, 12 insertions, 12 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
index 48a707557c29..4a52bbe327b7 100644
--- a/drivers/gpu/drm/i915/display/intel_display_core.h
+++ b/drivers/gpu/drm/i915/display/intel_display_core.h
@@ -480,6 +480,11 @@ struct intel_display {
 		 * bitfield.
 		 */
 		u32 vlv_imr_mask;
+		/*
+		 * Cached value of gen 5-7 DE IMR to avoid reads in updating the
+		 * bitfield.
+		 */
+		u32 ilk_de_imr_mask;
 		u32 de_irq_mask[I915_MAX_PIPES];
 		u32 pipestat_irq_mask[I915_MAX_PIPES];
 	} irq;
diff --git a/drivers/gpu/drm/i915/display/intel_display_irq.c b/drivers/gpu/drm/i915/display/intel_display_irq.c
index df718670546b..f4ba9b08e044 100644
--- a/drivers/gpu/drm/i915/display/intel_display_irq.c
+++ b/drivers/gpu/drm/i915/display/intel_display_irq.c
@@ -140,14 +140,14 @@ void ilk_update_display_irq(struct intel_display *display,
 	lockdep_assert_held(&display->irq.lock);
 	drm_WARN_ON(display->drm, enabled_irq_mask & ~interrupt_mask);
 
-	new_val = dev_priv->irq_mask;
+	new_val = display->irq.ilk_de_imr_mask;
 	new_val &= ~interrupt_mask;
 	new_val |= (~enabled_irq_mask & interrupt_mask);
 
-	if (new_val != dev_priv->irq_mask &&
+	if (new_val != display->irq.ilk_de_imr_mask &&
 	    !drm_WARN_ON(display->drm, !intel_irqs_enabled(dev_priv))) {
-		dev_priv->irq_mask = new_val;
-		intel_de_write(display, DEIMR, dev_priv->irq_mask);
+		display->irq.ilk_de_imr_mask = new_val;
+		intel_de_write(display, DEIMR, display->irq.ilk_de_imr_mask);
 		intel_de_posting_read(display, DEIMR);
 	}
 }
@@ -2180,8 +2180,6 @@ out:
 
 void ilk_de_irq_postinstall(struct intel_display *display)
 {
-	struct drm_i915_private *i915 = to_i915(display->drm);
-
 	u32 display_mask, extra_mask;
 
 	if (DISPLAY_VER(display) >= 7) {
@@ -2213,11 +2211,11 @@ void ilk_de_irq_postinstall(struct intel_display *display)
 	if (display->platform.ironlake && display->platform.mobile)
 		extra_mask |= DE_PCU_EVENT;
 
-	i915->irq_mask = ~display_mask;
+	display->irq.ilk_de_imr_mask = ~display_mask;
 
 	ibx_irq_postinstall(display);
 
-	intel_display_irq_regs_init(display, DE_IRQ_REGS, i915->irq_mask,
+	intel_display_irq_regs_init(display, DE_IRQ_REGS, display->irq.ilk_de_imr_mask,
 				    display_mask | extra_mask);
 }
 
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 8d5da222a187..e5fdfd51b549 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -659,7 +659,7 @@ static void ilk_irq_reset(struct drm_i915_private *dev_priv)
 	struct intel_uncore *uncore = &dev_priv->uncore;
 
 	gen2_irq_reset(uncore, DE_IRQ_REGS);
-	dev_priv->irq_mask = ~0u;
+	display->irq.ilk_de_imr_mask = ~0u;
 
 	if (GRAPHICS_VER(dev_priv) == 7)
 		intel_uncore_write(uncore, GEN7_ERR_INT, 0xffffffff);
diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
index 4353256452aa..79d3a59762d9 100644
--- a/drivers/gpu/drm/xe/xe_device_types.h
+++ b/drivers/gpu/drm/xe/xe_device_types.h
@@ -611,9 +611,6 @@ struct xe_device {
 	/* To shut up runtime pm macros.. */
 	struct xe_runtime_pm {} runtime_pm;
 
-	/* only to allow build, not used functionally */
-	u32 irq_mask;
-
 	struct intel_uncore {
 		spinlock_t lock;
 	} uncore;