From 466e69b8b03b8c1987367912782bc12988ad8794 Mon Sep 17 00:00:00 2001 From: Dave Airlie Date: Mon, 19 Dec 2011 11:15:29 +0000 Subject: drm: move pci bus master enable into driver. The current enabling of bus mastering in the drm midlayer allows a large race condition under kexec. When a kexec'ed kernel re-enables bus mastering for the GPU, previously setup dma blocks may cause writes to random pieces of memory. On radeon the writeback mechanism can cause these sorts of issues. This patch doesn't fix the problem, but it moves the bus master enable under the individual drivers control so they can move enabling it until later in their load cycle and close the race. Fix for radeon kms driver will be in a follow-up patch. Signed-off-by: Dave Airlie diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c index d4d10b7..13f3d93 100644 --- a/drivers/gpu/drm/drm_pci.c +++ b/drivers/gpu/drm/drm_pci.c @@ -324,8 +324,6 @@ int drm_get_pci_dev(struct pci_dev *pdev, const struct pci_device_id *ent, if (ret) goto err_g1; - pci_set_master(pdev); - dev->pdev = pdev; dev->dev = &pdev->dev; diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c index f14768f..1f57aac 100644 --- a/drivers/gpu/drm/gma500/psb_drv.c +++ b/drivers/gpu/drm/gma500/psb_drv.c @@ -283,6 +283,8 @@ static int psb_driver_load(struct drm_device *dev, unsigned long chipset) dev_priv->dev = dev; dev->dev_private = (void *) dev_priv; + pci_set_master(dev->pdev); + if (!IS_PSB(dev)) { if (pci_enable_msi(dev->pdev)) dev_warn(dev->dev, "Enabling MSI failed!\n"); diff --git a/drivers/gpu/drm/i810/i810_dma.c b/drivers/gpu/drm/i810/i810_dma.c index 7f4b4e1..64a989e 100644 --- a/drivers/gpu/drm/i810/i810_dma.c +++ b/drivers/gpu/drm/i810/i810_dma.c @@ -1208,6 +1208,8 @@ int i810_driver_load(struct drm_device *dev, unsigned long flags) dev->types[8] = _DRM_STAT_SECONDARY; dev->types[9] = _DRM_STAT_DMA; + pci_set_master(dev->pdev); + return 0; } diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c index 8919dcc..a8081f2 100644 --- a/drivers/gpu/drm/i915/i915_dma.c +++ b/drivers/gpu/drm/i915/i915_dma.c @@ -1933,6 +1933,8 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags) goto free_priv; } + pci_set_master(dev->pdev); + /* overlay on gen2 is broken and can't address above 1G */ if (IS_GEN2(dev)) dma_set_coherent_mask(&dev->pdev->dev, DMA_BIT_MASK(30)); diff --git a/drivers/gpu/drm/mga/mga_dma.c b/drivers/gpu/drm/mga/mga_dma.c index 5ccb65de..507aa3d 100644 --- a/drivers/gpu/drm/mga/mga_dma.c +++ b/drivers/gpu/drm/mga/mga_dma.c @@ -403,6 +403,8 @@ int mga_driver_load(struct drm_device *dev, unsigned long flags) dev_priv->usec_timeout = MGA_DEFAULT_USEC_TIMEOUT; dev_priv->chipset = flags; + pci_set_master(dev->pdev); + dev_priv->mmio_base = pci_resource_start(dev->pdev, 1); dev_priv->mmio_size = pci_resource_len(dev->pdev, 1); diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c index f80c5e0..912839c 100644 --- a/drivers/gpu/drm/nouveau/nouveau_state.c +++ b/drivers/gpu/drm/nouveau/nouveau_state.c @@ -1002,6 +1002,8 @@ int nouveau_load(struct drm_device *dev, unsigned long flags) dev->dev_private = dev_priv; dev_priv->dev = dev; + pci_set_master(dev->pdev); + dev_priv->flags = flags & NOUVEAU_FLAGS; NV_DEBUG(dev, "vendor: 0x%X device: 0x%X class: 0x%X\n", diff --git a/drivers/gpu/drm/r128/r128_drv.c b/drivers/gpu/drm/r128/r128_drv.c index 6a5f439..88718fa 100644 --- a/drivers/gpu/drm/r128/r128_drv.c +++ b/drivers/gpu/drm/r128/r128_drv.c @@ -85,6 +85,7 @@ static struct drm_driver driver = { int r128_driver_load(struct drm_device *dev, unsigned long flags) { + pci_set_master(dev->pdev); return drm_vblank_init(dev, 1); } diff --git a/drivers/gpu/drm/radeon/radeon_cp.c b/drivers/gpu/drm/radeon/radeon_cp.c index 72ae826..0ebb7d47 100644 --- a/drivers/gpu/drm/radeon/radeon_cp.c +++ b/drivers/gpu/drm/radeon/radeon_cp.c @@ -2115,6 +2115,8 @@ int radeon_driver_load(struct drm_device *dev, unsigned long flags) break; } + pci_set_master(dev->pdev); + if (drm_pci_device_is_agp(dev)) dev_priv->flags |= RADEON_IS_AGP; else if (pci_is_pcie(dev->pdev)) diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c index d335288..1986eba 100644 --- a/drivers/gpu/drm/radeon/radeon_kms.c +++ b/drivers/gpu/drm/radeon/radeon_kms.c @@ -57,6 +57,8 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags) } dev->dev_private = (void *)rdev; + pci_set_master(dev->pdev); + /* update BUS flag */ if (drm_pci_device_is_agp(dev)) { flags |= RADEON_IS_AGP; diff --git a/drivers/gpu/drm/sis/sis_drv.c b/drivers/gpu/drm/sis/sis_drv.c index 573220c..30d98d1 100644 --- a/drivers/gpu/drm/sis/sis_drv.c +++ b/drivers/gpu/drm/sis/sis_drv.c @@ -41,6 +41,8 @@ static int sis_driver_load(struct drm_device *dev, unsigned long chipset) { drm_sis_private_t *dev_priv; + pci_set_master(dev->pdev); + dev_priv = kzalloc(sizeof(drm_sis_private_t), GFP_KERNEL); if (dev_priv == NULL) return -ENOMEM; diff --git a/drivers/gpu/drm/via/via_map.c b/drivers/gpu/drm/via/via_map.c index a2ab343..1f18225 100644 --- a/drivers/gpu/drm/via/via_map.c +++ b/drivers/gpu/drm/via/via_map.c @@ -106,6 +106,8 @@ int via_driver_load(struct drm_device *dev, unsigned long chipset) idr_init(&dev->object_name_idr); + pci_set_master(dev->pdev); + ret = drm_vblank_init(dev, 1); if (ret) { kfree(dev_priv); diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index f076f66..1760aba 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -439,6 +439,8 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset) } memset(dev_priv, 0, sizeof(*dev_priv)); + pci_set_master(dev->pdev); + dev_priv->dev = dev; dev_priv->vmw_chipset = chipset; dev_priv->last_read_seqno = (uint32_t) -100; -- cgit v0.10.2