drm/radeon/kms: add support for msi

Try to enable msi on chips that support it.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/r100.c

@@ -186,7 +186,7 @@ static inline uint32_t r100_irq_ack(struct radeon_device *rdev)
 
 int r100_irq_process(struct radeon_device *rdev)
 {
-	uint32_t status;
+	uint32_t status, msi_rearm;
 
 	status = r100_irq_ack(rdev);
 	if (!status) {
@@ -209,6 +209,21 @@ int r100_irq_process(struct radeon_device *rdev)
 		}
 		status = r100_irq_ack(rdev);
 	}
+	if (rdev->msi_enabled) {
+		switch (rdev->family) {
+		case CHIP_RS400:
+		case CHIP_RS480:
+			msi_rearm = RREG32(RADEON_AIC_CNTL) & ~RS400_MSI_REARM;
+			WREG32(RADEON_AIC_CNTL, msi_rearm);
+			WREG32(RADEON_AIC_CNTL, msi_rearm | RS400_MSI_REARM);
+			break;
+		default:
+			msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
+			WREG32(RADEON_MSI_REARM_EN, msi_rearm);
+			WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
+			break;
+		}
+	}
 	return IRQ_HANDLED;
 }
 

drivers/gpu/drm/radeon/radeon.h

@@ -784,6 +784,7 @@ struct radeon_device {
 	const struct firmware *me_fw;	/* all family ME firmware */
 	const struct firmware *pfp_fw;	/* r6/700 PFP firmware */
 	struct r600_blit r600_blit;
+	int msi_enabled; /* msi enabled */
 };
 
 int radeon_device_init(struct radeon_device *rdev,

drivers/gpu/drm/radeon/radeon_irq_kms.c

@@ -92,6 +92,13 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
 	if (r) {
 		return r;
 	}
+	/* enable msi */
+	rdev->msi_enabled = 0;
+	if (rdev->family >= CHIP_RV380) {
+		int ret = pci_enable_msi(rdev->pdev);
+		if (!ret)
+			rdev->msi_enabled = 1;
+	}
 	drm_irq_install(rdev->ddev);
 	rdev->irq.installed = true;
 	DRM_INFO("radeon: irq initialized.\n");
@@ -103,5 +110,7 @@ void radeon_irq_kms_fini(struct radeon_device *rdev)
 	if (rdev->irq.installed) {
 		rdev->irq.installed = false;
 		drm_irq_uninstall(rdev->ddev);
+		if (rdev->msi_enabled)
+			pci_disable_msi(rdev->pdev);
 	}
 }

drivers/gpu/drm/radeon/radeon_reg.h

@@ -290,6 +290,8 @@
 #define RADEON_BUS_CNTL                     0x0030
 #       define RADEON_BUS_MASTER_DIS         (1 << 6)
 #       define RADEON_BUS_BIOS_DIS_ROM       (1 << 12)
+#	define RS600_BUS_MASTER_DIS	     (1 << 14)
+#	define RS600_MSI_REARM		     (1 << 20) /* rs600/rs690/rs740 */
 #       define RADEON_BUS_RD_DISCARD_EN      (1 << 24)
 #       define RADEON_BUS_RD_ABORT_EN        (1 << 25)
 #       define RADEON_BUS_MSTR_DISCONNECT_EN (1 << 28)
@@ -297,6 +299,9 @@
 #       define RADEON_BUS_READ_BURST         (1 << 30)
 #define RADEON_BUS_CNTL1                    0x0034
 #       define RADEON_BUS_WAIT_ON_LOCK_EN    (1 << 4)
+/* rv370/rv380, rv410, r423/r430/r480, r5xx */
+#define RADEON_MSI_REARM_EN		    0x0160
+#	define RV370_MSI_REARM_EN	     (1 << 0)
 
 /* #define RADEON_PCIE_INDEX                   0x0030 */
 /* #define RADEON_PCIE_DATA                    0x0034 */
@@ -3311,6 +3316,7 @@
 #define RADEON_AIC_CNTL                     0x01d0
 #       define RADEON_PCIGART_TRANSLATE_EN     (1 << 0)
 #       define RADEON_DIS_OUT_OF_PCI_GART_ACCESS     (1 << 1)
+#	define RS400_MSI_REARM	                (1 << 3) /* rs400/rs480 */
 #define RADEON_AIC_LO_ADDR                  0x01dc
 #define RADEON_AIC_PT_BASE		0x01d8
 #define RADEON_AIC_HI_ADDR		0x01e0

drivers/gpu/drm/radeon/rs600.c

@@ -242,7 +242,7 @@ void rs600_irq_disable(struct radeon_device *rdev)
 
 int rs600_irq_process(struct radeon_device *rdev)
 {
-	uint32_t status;
+	uint32_t status, msi_rearm;
 	uint32_t r500_disp_int;
 
 	status = rs600_irq_ack(rdev, &r500_disp_int);
@@ -260,6 +260,22 @@ int rs600_irq_process(struct radeon_device *rdev)
 			drm_handle_vblank(rdev->ddev, 1);
 		status = rs600_irq_ack(rdev, &r500_disp_int);
 	}
+	if (rdev->msi_enabled) {
+		switch (rdev->family) {
+		case CHIP_RS600:
+		case CHIP_RS690:
+		case CHIP_RS740:
+			msi_rearm = RREG32(RADEON_BUS_CNTL) & ~RS600_MSI_REARM;
+			WREG32(RADEON_BUS_CNTL, msi_rearm);
+			WREG32(RADEON_BUS_CNTL, msi_rearm | RS600_MSI_REARM);
+			break;
+		default:
+			msi_rearm = RREG32(RADEON_MSI_REARM_EN) & ~RV370_MSI_REARM_EN;
+			WREG32(RADEON_MSI_REARM_EN, msi_rearm);
+			WREG32(RADEON_MSI_REARM_EN, msi_rearm | RV370_MSI_REARM_EN);
+			break;
+		}
+	}
 	return IRQ_HANDLED;
 }