Enable Message Signaled Interrupts (MSI) (#163)

This fixes ridiculous interrupt rate on aarch64,
was enabled in the legacy in-tree drm port,
and is a good idea in general.

Author: valpackett

drivers/gpu/drm/amd/amdgpu/amdgpu_irq.c

@@ -42,8 +42,6 @@
 #endif
 
 #define AMDGPU_WAIT_IDLE_TIMEOUT 200
-#define pci_enable_msi linux_pci_enable_msi
-#define pci_disable_msi linux_pci_disable_msi
 
 /*
  * Handle hotplug events outside the interrupt handler proper.
@@ -231,7 +229,7 @@ int amdgpu_irq_init(struct amdgpu_device *adev)
 	adev->irq.msi_enabled = false;
 
 	if (amdgpu_msi_ok(adev)) {
-#ifdef __linux__
+#if defined(__linux__) || defined(pci_enable_msi)
 		int ret = pci_enable_msi(adev->pdev);
 		if (!ret) {
 			adev->irq.msi_enabled = true;
@@ -285,7 +283,7 @@ void amdgpu_irq_fini(struct amdgpu_device *adev)
 	if (adev->irq.installed) {
 		drm_irq_uninstall(adev->ddev);
 		adev->irq.installed = false;
-#ifdef __linux__
+#if defined(__linux__) || defined(pci_disable_msi)
 		if (adev->irq.msi_enabled)
 			pci_disable_msi(adev->pdev);
 #endif

drivers/gpu/drm/i915/i915_drv.c

@@ -1241,7 +1241,7 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
 
 	i915_gem_load_init_fences(dev_priv);
 
-#ifdef __linux__
+#if defined(__linux__) || defined(pci_enable_msi)
 	/* On the 945G/GM, the chipset reports the MSI capability on the
 	 * integrated graphics even though the support isn't actually there
 	 * according to the published specs.  It doesn't appear to function
@@ -1279,11 +1279,15 @@ static int i915_driver_init_hw(struct drm_i915_private *dev_priv)
  */
 static void i915_driver_cleanup_hw(struct drm_i915_private *dev_priv)
 {
-#ifdef __linux__
+#if defined(__linux__) || defined(pci_disable_msi)
 	struct pci_dev *pdev = dev_priv->drm.pdev;
+#endif
 
+#ifdef CONFIG_I915_PERF
 	i915_perf_fini(dev_priv);
+#endif
 
+#if defined(__linux__) || defined(pci_disable_msi)
 	if (pdev->msi_enabled)
 		pci_disable_msi(pdev);
 #endif

drivers/gpu/drm/radeon/radeon_irq_kms.c

@@ -298,7 +298,7 @@ int radeon_irq_kms_init(struct radeon_device *rdev)
 	rdev->msi_enabled = 0;
 
 	if (radeon_msi_ok(rdev)) {
-#ifdef __linux__
+#if defined(__linux__) || defined(pci_enable_msi)
 		int ret = pci_enable_msi(rdev->pdev);
 		if (!ret) {
 			rdev->msi_enabled = 1;
@@ -335,7 +335,7 @@ void radeon_irq_kms_fini(struct radeon_device *rdev)
 	if (rdev->irq.installed) {
 		drm_irq_uninstall(rdev->ddev);
 		rdev->irq.installed = false;
-#ifdef __linux__
+#if defined(__linux__) || defined(pci_disable_msi)
 		if (rdev->msi_enabled)
 			pci_disable_msi(rdev->pdev);
 #endif