This is a patch set from Christoph Hellwig. Patch 2 has been updated by me to not remove checks for TTM coherent pool presence. Ideally, we should query TTM for this instead and I'll have a patch set intended for 5.1 so that we can do that. But I don't want to introduce cross-module API additions outside of a merge window.
Original patch set description: vmwgfx has been doing some odd checks based on DMA ops which rely on deep DMA mapping layer internals, and I think the changes in Linux 4.21 finally broke most of these implicit assumptions.
The real fix is in patch 3, but I think the others are important to make it clear what is actually going on.
From: Christoph Hellwig hch@lst.de
The driver depends on CONFIG_X86 so these are dead code.
Signed-off-by: Christoph Hellwig hch@lst.de --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 6 ------ 1 file changed, 6 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index 25afb1d594e3..69e325b2d954 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -565,7 +565,6 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) [vmw_dma_alloc_coherent] = "Using coherent TTM pages.", [vmw_dma_map_populate] = "Keeping DMA mappings.", [vmw_dma_map_bind] = "Giving up DMA mappings early."}; -#ifdef CONFIG_X86 const struct dma_map_ops *dma_ops = get_dma_ops(dev_priv->dev->dev);
#ifdef CONFIG_INTEL_IOMMU @@ -607,11 +606,6 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) if (dev_priv->map_mode == vmw_dma_alloc_coherent) return -EINVAL; #endif - -#else /* CONFIG_X86 */ - dev_priv->map_mode = vmw_dma_map_populate; -#endif /* CONFIG_X86 */ - DRM_INFO("DMA map mode: %s\n", names[dev_priv->map_mode]);
return 0;
From: Christoph Hellwig hch@lst.de
intel_iommu_enabled is defined as always false for !CONFIG_INTEL_IOMMU, so remove the ifdefs around it.
Signed-off-by: Christoph Hellwig hch@lst.de Reviewed-by: Thomas Hellstrom thellstrom@vmware.com --- v2: Retain the check for TTM dma page pool presence. --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 21 ++++----------------- 1 file changed, 4 insertions(+), 17 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index 69e325b2d954..b7777b5b4a81 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -567,12 +567,10 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) [vmw_dma_map_bind] = "Giving up DMA mappings early."}; const struct dma_map_ops *dma_ops = get_dma_ops(dev_priv->dev->dev);
-#ifdef CONFIG_INTEL_IOMMU if (intel_iommu_enabled) { dev_priv->map_mode = vmw_dma_map_populate; goto out_fixup; } -#endif
if (!(vmw_force_iommu || vmw_force_coherent)) { dev_priv->map_mode = vmw_dma_phys; @@ -589,9 +587,7 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) dev_priv->map_mode = vmw_dma_map_populate; #endif
-#ifdef CONFIG_INTEL_IOMMU out_fixup: -#endif if (dev_priv->map_mode == vmw_dma_map_populate && vmw_restrict_iommu) dev_priv->map_mode = vmw_dma_map_bind; @@ -599,13 +595,11 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) if (vmw_force_coherent) dev_priv->map_mode = vmw_dma_alloc_coherent;
-#if !defined(CONFIG_SWIOTLB) && !defined(CONFIG_INTEL_IOMMU) - /* - * No coherent page pool - */ - if (dev_priv->map_mode == vmw_dma_alloc_coherent) + /* No TTM coherent page pool? FIXME: Ask TTM instead! */ + if (!(IS_ENABLED(CONFIG_SWIOTLB) || IS_ENABLED(CONFIG_INTEL_IOMMU)) && + (dev_priv->map_mode == vmw_dma_alloc_coherent)) return -EINVAL; -#endif + DRM_INFO("DMA map mode: %s\n", names[dev_priv->map_mode]);
return 0; @@ -619,7 +613,6 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) * With 32-bit we can only handle 32 bit PFNs. Optionally set that * restriction also for 64-bit systems. */ -#ifdef CONFIG_INTEL_IOMMU static int vmw_dma_masks(struct vmw_private *dev_priv) { struct drm_device *dev = dev_priv->dev; @@ -631,12 +624,6 @@ static int vmw_dma_masks(struct vmw_private *dev_priv) } return 0; } -#else -static int vmw_dma_masks(struct vmw_private *dev_priv) -{ - return 0; -} -#endif
static int vmw_driver_load(struct drm_device *dev, unsigned long chipset) {
From: Christoph Hellwig hch@lst.de
Since Linux 4.21 we merged the swiotlb ops into the DMA direct ops, so they would always have a the sync_single methods. But late in the cicle we also removed the direct ops entirely, so we'd see NULL DMA ops. Switch vmw_dma_select_mode to only detect swiotlb presence using swiotlb_nr_tbl() instead.
Fixes: 55897af630 ("dma-direct: merge swiotlb_dma_ops into the dma_direct code") Fixes: 356da6d0cd ("dma-mapping: bypass indirect calls for dma-direct") Signed-off-by: Christoph Hellwig hch@lst.de --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 11 ++++------- 1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index b7777b5b4a81..1456101e67a9 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -565,7 +565,6 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) [vmw_dma_alloc_coherent] = "Using coherent TTM pages.", [vmw_dma_map_populate] = "Keeping DMA mappings.", [vmw_dma_map_bind] = "Giving up DMA mappings early."}; - const struct dma_map_ops *dma_ops = get_dma_ops(dev_priv->dev->dev);
if (intel_iommu_enabled) { dev_priv->map_mode = vmw_dma_map_populate; @@ -578,14 +577,12 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) return 0; }
- dev_priv->map_mode = vmw_dma_map_populate; - - if (dma_ops && dma_ops->sync_single_for_cpu) - dev_priv->map_mode = vmw_dma_alloc_coherent; #ifdef CONFIG_SWIOTLB - if (swiotlb_nr_tbl() == 0) - dev_priv->map_mode = vmw_dma_map_populate; + if (swiotlb_nr_tbl()) + dev_priv->map_mode = vmw_dma_alloc_coherent; + else #endif + dev_priv->map_mode = vmw_dma_map_populate;
out_fixup: if (dev_priv->map_mode == vmw_dma_map_populate &&
From: Christoph Hellwig hch@lst.de
Just use a simple if/else chain to select the DMA mode.
Signed-off-by: Christoph Hellwig hch@lst.de --- drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 25 ++++++------------------- 1 file changed, 6 insertions(+), 19 deletions(-)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c index 1456101e67a9..3e2bcff34032 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c @@ -566,39 +566,26 @@ static int vmw_dma_select_mode(struct vmw_private *dev_priv) [vmw_dma_map_populate] = "Keeping DMA mappings.", [vmw_dma_map_bind] = "Giving up DMA mappings early."};
- if (intel_iommu_enabled) { + if (vmw_force_coherent) + dev_priv->map_mode = vmw_dma_alloc_coherent; + else if (intel_iommu_enabled) dev_priv->map_mode = vmw_dma_map_populate; - goto out_fixup; - } - - if (!(vmw_force_iommu || vmw_force_coherent)) { + else if (!vmw_force_iommu) dev_priv->map_mode = vmw_dma_phys; - DRM_INFO("DMA map mode: %s\n", names[dev_priv->map_mode]); - return 0; - } - -#ifdef CONFIG_SWIOTLB - if (swiotlb_nr_tbl()) + else if (IS_ENABLED(CONFIG_SWIOTLB) && swiotlb_nr_tbl()) dev_priv->map_mode = vmw_dma_alloc_coherent; else -#endif dev_priv->map_mode = vmw_dma_map_populate;
-out_fixup: - if (dev_priv->map_mode == vmw_dma_map_populate && - vmw_restrict_iommu) + if (dev_priv->map_mode == vmw_dma_map_populate && vmw_restrict_iommu) dev_priv->map_mode = vmw_dma_map_bind;
- if (vmw_force_coherent) - dev_priv->map_mode = vmw_dma_alloc_coherent; - /* No TTM coherent page pool? FIXME: Ask TTM instead! */ if (!(IS_ENABLED(CONFIG_SWIOTLB) || IS_ENABLED(CONFIG_INTEL_IOMMU)) && (dev_priv->map_mode == vmw_dma_alloc_coherent)) return -EINVAL;
DRM_INFO("DMA map mode: %s\n", names[dev_priv->map_mode]); - return 0; }
dri-devel@lists.freedesktop.org
-
Thomas Hellstrom