From 35fa2f2ad161024e735fb0cd571cb92e50171afd Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Thu, 21 Oct 2010 14:07:03 +1000 Subject: [PATCH] drm/nouveau: add support for MSI Only supported on NV50+ so far, and disabled by default currently. The module parameter "msi=1" will enable it. There's a kernel bug which will cause this to fail if the module (or the NVIDIA binary driver) has ever been loaded before loading nouveau with MSI enabled. As such, this is only safe to enable if you have nouveau load on boot, and don't wish to ever reload it. The workaround is to "echo 0 > /sys/bus/pci/devices//enable" until the enable count reads 0. Then you should be able to load nouveau with MSI enabled. Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_drv.c | 4 +++ drivers/gpu/drm/nouveau/nouveau_drv.h | 5 ++++ drivers/gpu/drm/nouveau/nouveau_irq.c | 35 +++++++++++++++++++++++++ drivers/gpu/drm/nouveau/nouveau_state.c | 9 +++---- 4 files changed, 47 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.c b/drivers/gpu/drm/nouveau/nouveau_drv.c index 6dbb8818c530..db926ecf5b6f 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.c +++ b/drivers/gpu/drm/nouveau/nouveau_drv.c @@ -115,6 +115,10 @@ MODULE_PARM_DESC(perflvl_wr, "Allow perflvl changes (warning: dangerous!)\n"); int nouveau_perflvl_wr; module_param_named(perflvl_wr, nouveau_perflvl_wr, int, 0400); +MODULE_PARM_DESC(msi, "Enable MSI (default: off)\n"); +int nouveau_msi; +module_param_named(msi, nouveau_msi, int, 0400); + int nouveau_fbpercrtc; #if 0 module_param_named(fbpercrtc, nouveau_fbpercrtc, int, 0400); diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h index bf34f25c7a54..9ab7dc8ede4e 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -593,6 +593,8 @@ struct drm_nouveau_private { struct nouveau_bo *vga_ram; + /* interrupt handling */ + bool msi_enabled; struct workqueue_struct *wq; struct work_struct irq_work; struct work_struct hpd_work; @@ -754,6 +756,7 @@ extern int nouveau_force_post; extern int nouveau_override_conntype; extern char *nouveau_perflvl; extern int nouveau_perflvl_wr; +extern int nouveau_msi; extern int nouveau_pci_suspend(struct pci_dev *pdev, pm_message_t pm_state); extern int nouveau_pci_resume(struct pci_dev *pdev); @@ -872,6 +875,8 @@ extern int nouveau_ioctl_gpuobj_free(struct drm_device *, void *data, struct drm_file *); /* nouveau_irq.c */ +extern int nouveau_irq_init(struct drm_device *); +extern void nouveau_irq_fini(struct drm_device *); extern irqreturn_t nouveau_irq_handler(DRM_IRQ_ARGS); extern void nouveau_irq_preinstall(struct drm_device *); extern int nouveau_irq_postinstall(struct drm_device *); diff --git a/drivers/gpu/drm/nouveau/nouveau_irq.c b/drivers/gpu/drm/nouveau/nouveau_irq.c index ca9b969f4f9c..17e2fa86cde7 100644 --- a/drivers/gpu/drm/nouveau/nouveau_irq.c +++ b/drivers/gpu/drm/nouveau/nouveau_irq.c @@ -68,8 +68,13 @@ nouveau_irq_preinstall(struct drm_device *dev) int nouveau_irq_postinstall(struct drm_device *dev) { + struct drm_nouveau_private *dev_priv = dev->dev_private; + /* Master enable */ nv_wr32(dev, NV03_PMC_INTR_EN_0, NV_PMC_INTR_EN_0_MASTER_ENABLE); + if (dev_priv->msi_enabled) + nv_wr08(dev, 0x00088068, 0xff); + return 0; } @@ -1263,5 +1268,35 @@ nouveau_irq_handler(DRM_IRQ_ARGS) spin_unlock_irqrestore(&dev_priv->context_switch_lock, flags); + if (dev_priv->msi_enabled) + nv_wr08(dev, 0x00088068, 0xff); + return IRQ_HANDLED; } + +int +nouveau_irq_init(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + int ret; + + if (nouveau_msi != 0 && dev_priv->card_type >= NV_50) { + ret = pci_enable_msi(dev->pdev); + if (ret == 0) { + NV_INFO(dev, "enabled MSI\n"); + dev_priv->msi_enabled = true; + } + } + + return drm_irq_install(dev); +} + +void +nouveau_irq_fini(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + + drm_irq_uninstall(dev); + if (dev_priv->msi_enabled) + pci_disable_msi(dev->pdev); +} diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c index f13134aa8c4f..410a79f5e0cd 100644 --- a/drivers/gpu/drm/nouveau/nouveau_state.c +++ b/drivers/gpu/drm/nouveau/nouveau_state.c @@ -667,10 +667,7 @@ nouveau_card_init(struct drm_device *dev) if (ret) goto out_fifo; - /* this call irq_preinstall, register irq handler and - * call irq_postinstall - */ - ret = drm_irq_install(dev); + ret = nouveau_irq_init(dev); if (ret) goto out_display; @@ -701,7 +698,7 @@ nouveau_card_init(struct drm_device *dev) out_fence: nouveau_fence_fini(dev); out_irq: - drm_irq_uninstall(dev); + nouveau_irq_fini(dev); out_display: engine->display.destroy(dev); out_fifo: @@ -772,7 +769,7 @@ static void nouveau_card_takedown(struct drm_device *dev) nouveau_gpuobj_takedown(dev); nouveau_mem_vram_fini(dev); - drm_irq_uninstall(dev); + nouveau_irq_fini(dev); nouveau_pm_fini(dev); nouveau_bios_takedown(dev); -- GitLab