drm/i915: add GEN2_ prefix to the I{E, I, M, S}R registers

This discussion started because we use token pasting in the
GEN{2,3}_IRQ_INIT and GEN{2,3}_IRQ_RESET macros, so gen2-4 passes an
empty argument to those macros, making the code a little weird. The
original proposal was to just add a comment as the empty argument, but
Ville suggested we just add a prefix to the registers, and that indeed
sounds like a more elegant solution.

Now doing this is kinda against our rules for register naming since we
only add gens or platform names as register prefixes when the given
gen/platform changes a register that already existed before. On the
other hand, we have so many instances of IIR/IMR in comments that
adding a prefix would make the users of these register more easily
findable, in addition to make our token pasting macros actually
readable. So IMHO opening an exception here is worth it.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190410235344.31199-4-paulo.r.zanoni@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -833,11 +833,11 @@ static int i915_interrupt_info(struct seq_file *m, void *data)
 
 	} else if (!HAS_PCH_SPLIT(dev_priv)) {
 		seq_printf(m, "Interrupt enable:    %08x\n",
-			   I915_READ(IER));
+			   I915_READ(GEN2_IER));
 		seq_printf(m, "Interrupt identity:  %08x\n",
-			   I915_READ(IIR));
+			   I915_READ(GEN2_IIR));
 		seq_printf(m, "Interrupt mask:      %08x\n",
-			   I915_READ(IMR));
+			   I915_READ(GEN2_IMR));
 		for_each_pipe(dev_priv, pipe)
 			seq_printf(m, "Pipe %c stat:         %08x\n",
 				   pipe_name(pipe),

drivers/gpu/drm/i915/i915_gpu_error.c

@@ -1635,9 +1635,9 @@ static void capture_reg_state(struct i915_gpu_state *error)
 		error->gtier[0] = I915_READ(GTIER);
 		error->ngtier = 1;
 	} else if (IS_GEN(dev_priv, 2)) {
-		error->ier = I915_READ16(IER);
+		error->ier = I915_READ16(GEN2_IER);
 	} else if (!IS_VALLEYVIEW(dev_priv)) {
-		error->ier = I915_READ(IER);
+		error->ier = I915_READ(GEN2_IER);
 	}
 	error->eir = I915_READ(EIR);
 	error->pgtbl_er = I915_READ(PGTBL_ER);

drivers/gpu/drm/i915/i915_irq.c

@@ -153,16 +153,16 @@ static void gen3_irq_reset(struct drm_i915_private *dev_priv, i915_reg_t imr,
 
 static void gen2_irq_reset(struct drm_i915_private *dev_priv)
 {
-	I915_WRITE16(IMR, 0xffff);
-	POSTING_READ16(IMR);
+	I915_WRITE16(GEN2_IMR, 0xffff);
+	POSTING_READ16(GEN2_IMR);
 
-	I915_WRITE16(IER, 0);
+	I915_WRITE16(GEN2_IER, 0);
 
 	/* IIR can theoretically queue up two events. Be paranoid. */
-	I915_WRITE16(IIR, 0xffff);
-	POSTING_READ16(IIR);
-	I915_WRITE16(IIR, 0xffff);
-	POSTING_READ16(IIR);
+	I915_WRITE16(GEN2_IIR, 0xffff);
+	POSTING_READ16(GEN2_IIR);
+	I915_WRITE16(GEN2_IIR, 0xffff);
+	POSTING_READ16(GEN2_IIR);
 }
 
 #define GEN8_IRQ_RESET_NDX(type, which) \
@@ -199,17 +199,17 @@ static void gen3_assert_iir_is_zero(struct drm_i915_private *dev_priv,
 
 static void gen2_assert_iir_is_zero(struct drm_i915_private *dev_priv)
 {
-	u16 val = I915_READ16(IIR);
+	u16 val = I915_READ16(GEN2_IIR);
 
 	if (val == 0)
 		return;
 
 	WARN(1, "Interrupt register 0x%x is not zero: 0x%08x\n",
-	     i915_mmio_reg_offset(IIR), val);
-	I915_WRITE16(IIR, 0xffff);
-	POSTING_READ16(IIR);
-	I915_WRITE16(IIR, 0xffff);
-	POSTING_READ16(IIR);
+	     i915_mmio_reg_offset(GEN2_IIR), val);
+	I915_WRITE16(GEN2_IIR, 0xffff);
+	POSTING_READ16(GEN2_IIR);
+	I915_WRITE16(GEN2_IIR, 0xffff);
+	POSTING_READ16(GEN2_IIR);
 }
 
 static void gen3_irq_init(struct drm_i915_private *dev_priv,
@@ -229,9 +229,9 @@ static void gen2_irq_init(struct drm_i915_private *dev_priv,
 {
 	gen2_assert_iir_is_zero(dev_priv);
 
-	I915_WRITE16(IER, ier_val);
-	I915_WRITE16(IMR, imr_val);
-	POSTING_READ16(IMR);
+	I915_WRITE16(GEN2_IER, ier_val);
+	I915_WRITE16(GEN2_IMR, imr_val);
+	POSTING_READ16(GEN2_IMR);
 }
 
 #define GEN8_IRQ_INIT_NDX(type, which, imr_val, ier_val) \
@@ -4360,7 +4360,7 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
 		u16 eir = 0, eir_stuck = 0;
 		u16 iir;
 
-		iir = I915_READ16(IIR);
+		iir = I915_READ16(GEN2_IIR);
 		if (iir == 0)
 			break;
 
@@ -4373,7 +4373,7 @@ static irqreturn_t i8xx_irq_handler(int irq, void *arg)
 		if (iir & I915_MASTER_ERROR_INTERRUPT)
 			i8xx_error_irq_ack(dev_priv, &eir, &eir_stuck);
 
-		I915_WRITE16(IIR, iir);
+		I915_WRITE16(GEN2_IIR, iir);
 
 		if (iir & I915_USER_INTERRUPT)
 			intel_engine_breadcrumbs_irq(dev_priv->engine[RCS0]);
@@ -4400,7 +4400,7 @@ static void i915_irq_reset(struct drm_device *dev)
 
 	i9xx_pipestat_irq_reset(dev_priv);
 
-	GEN3_IRQ_RESET();
+	GEN3_IRQ_RESET(GEN2_);
 }
 
 static int i915_irq_postinstall(struct drm_device *dev)
@@ -4432,7 +4432,7 @@ static int i915_irq_postinstall(struct drm_device *dev)
 		dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
 	}
 
-	GEN3_IRQ_INIT(, dev_priv->irq_mask, enable_mask);
+	GEN3_IRQ_INIT(GEN2_, dev_priv->irq_mask, enable_mask);
 
 	/* Interrupt setup is already guaranteed to be single-threaded, this is
 	 * just to make the assert_spin_locked check happy. */
@@ -4464,7 +4464,7 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
 		u32 hotplug_status = 0;
 		u32 iir;
 
-		iir = I915_READ(IIR);
+		iir = I915_READ(GEN2_IIR);
 		if (iir == 0)
 			break;
 
@@ -4481,7 +4481,7 @@ static irqreturn_t i915_irq_handler(int irq, void *arg)
 		if (iir & I915_MASTER_ERROR_INTERRUPT)
 			i9xx_error_irq_ack(dev_priv, &eir, &eir_stuck);
 
-		I915_WRITE(IIR, iir);
+		I915_WRITE(GEN2_IIR, iir);
 
 		if (iir & I915_USER_INTERRUPT)
 			intel_engine_breadcrumbs_irq(dev_priv->engine[RCS0]);
@@ -4509,7 +4509,7 @@ static void i965_irq_reset(struct drm_device *dev)
 
 	i9xx_pipestat_irq_reset(dev_priv);
 
-	GEN3_IRQ_RESET();
+	GEN3_IRQ_RESET(GEN2_);
 }
 
 static int i965_irq_postinstall(struct drm_device *dev)
@@ -4552,7 +4552,7 @@ static int i965_irq_postinstall(struct drm_device *dev)
 	if (IS_G4X(dev_priv))
 		enable_mask |= I915_BSD_USER_INTERRUPT;
 
-	GEN3_IRQ_INIT(, dev_priv->irq_mask, enable_mask);
+	GEN3_IRQ_INIT(GEN2_, dev_priv->irq_mask, enable_mask);
 
 	/* Interrupt setup is already guaranteed to be single-threaded, this is
 	 * just to make the assert_spin_locked check happy. */
@@ -4610,7 +4610,7 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
 		u32 hotplug_status = 0;
 		u32 iir;
 
-		iir = I915_READ(IIR);
+		iir = I915_READ(GEN2_IIR);
 		if (iir == 0)
 			break;
 
@@ -4626,7 +4626,7 @@ static irqreturn_t i965_irq_handler(int irq, void *arg)
 		if (iir & I915_MASTER_ERROR_INTERRUPT)
 			i9xx_error_irq_ack(dev_priv, &eir, &eir_stuck);
 
-		I915_WRITE(IIR, iir);
+		I915_WRITE(GEN2_IIR, iir);
 
 		if (iir & I915_USER_INTERRUPT)
 			intel_engine_breadcrumbs_irq(dev_priv->engine[RCS0]);

drivers/gpu/drm/i915/i915_reg.h

@@ -2715,10 +2715,10 @@ enum i915_power_well_id {
 #define VLV_GU_CTL0	_MMIO(VLV_DISPLAY_BASE + 0x2030)
 #define VLV_GU_CTL1	_MMIO(VLV_DISPLAY_BASE + 0x2034)
 #define SCPD0		_MMIO(0x209c) /* 915+ only */
-#define IER		_MMIO(0x20a0)
-#define IIR		_MMIO(0x20a4)
-#define IMR		_MMIO(0x20a8)
-#define ISR		_MMIO(0x20ac)
+#define GEN2_IER	_MMIO(0x20a0)
+#define GEN2_IIR	_MMIO(0x20a4)
+#define GEN2_IMR	_MMIO(0x20a8)
+#define GEN2_ISR	_MMIO(0x20ac)
 #define VLV_GUNIT_CLOCK_GATE	_MMIO(VLV_DISPLAY_BASE + 0x2060)
 #define   GINT_DIS		(1 << 22)
 #define   GCFG_DIS		(1 << 8)

drivers/gpu/drm/i915/i915_reset.c

@@ -1239,7 +1239,8 @@ void i915_clear_error_registers(struct drm_i915_private *i915)
 		 */
 		DRM_DEBUG_DRIVER("EIR stuck: 0x%08x, masking\n", eir);
 		rmw_set(uncore, EMR, eir);
-		intel_uncore_write(uncore, IIR, I915_MASTER_ERROR_INTERRUPT);
+		intel_uncore_write(uncore, GEN2_IIR,
+				   I915_MASTER_ERROR_INTERRUPT);
 	}
 
 	if (INTEL_GEN(i915) >= 8) {

drivers/gpu/drm/i915/intel_overlay.c

@@ -446,7 +446,7 @@ static int intel_overlay_release_old_vid(struct intel_overlay *overlay)
 	if (!overlay->old_vma)
 		return 0;
 
-	if (I915_READ(ISR) & I915_OVERLAY_PLANE_FLIP_PENDING_INTERRUPT) {
+	if (I915_READ(GEN2_ISR) & I915_OVERLAY_PLANE_FLIP_PENDING_INTERRUPT) {
 		/* synchronous slowpath */
 		struct i915_request *rq;
 
@@ -1430,7 +1430,7 @@ intel_overlay_capture_error_state(struct drm_i915_private *dev_priv)
 		return NULL;
 
 	error->dovsta = I915_READ(DOVSTA);
-	error->isr = I915_READ(ISR);
+	error->isr = I915_READ(GEN2_ISR);
 	error->base = overlay->flip_addr;
 
 	memcpy_fromio(&error->regs, overlay->regs, sizeof(error->regs));

drivers/gpu/drm/i915/intel_ringbuffer.c

@@ -977,15 +977,15 @@ static void
 i9xx_irq_enable(struct intel_engine_cs *engine)
 {
 	engine->i915->irq_mask &= ~engine->irq_enable_mask;
-	intel_uncore_write(engine->uncore, IMR, engine->i915->irq_mask);
-	intel_uncore_posting_read_fw(engine->uncore, IMR);
+	intel_uncore_write(engine->uncore, GEN2_IMR, engine->i915->irq_mask);
+	intel_uncore_posting_read_fw(engine->uncore, GEN2_IMR);
 }
 
 static void
 i9xx_irq_disable(struct intel_engine_cs *engine)
 {
 	engine->i915->irq_mask |= engine->irq_enable_mask;
-	intel_uncore_write(engine->uncore, IMR, engine->i915->irq_mask);
+	intel_uncore_write(engine->uncore, GEN2_IMR, engine->i915->irq_mask);
 }
 
 static void
@@ -994,7 +994,7 @@ i8xx_irq_enable(struct intel_engine_cs *engine)
 	struct drm_i915_private *dev_priv = engine->i915;
 
 	dev_priv->irq_mask &= ~engine->irq_enable_mask;
-	I915_WRITE16(IMR, dev_priv->irq_mask);
+	I915_WRITE16(GEN2_IMR, dev_priv->irq_mask);
 	POSTING_READ16(RING_IMR(engine->mmio_base));
 }
 
@@ -1004,7 +1004,7 @@ i8xx_irq_disable(struct intel_engine_cs *engine)
 	struct drm_i915_private *dev_priv = engine->i915;
 
 	dev_priv->irq_mask |= engine->irq_enable_mask;
-	I915_WRITE16(IMR, dev_priv->irq_mask);
+	I915_WRITE16(GEN2_IMR, dev_priv->irq_mask);
 }
 
 static int