From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Tue, 9 Jul 2019 16:21:02 +0000 (-0700)
Subject: Merge tag 'iommu-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro... 
X-Git-Tag: for-linus-20190715~32
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=6b04014f3f151ed62878327813859e76e8e23d78;p=linux-2.6-block.git

Merge tag 'iommu-updates-v5.3' of git://git./linux/kernel/git/joro/iommu

Pull iommu updates from Joerg Roedel:

 - Make the dma-iommu code more generic so that it can be used outside
   of the ARM context with other IOMMU drivers. Goal is to make use of
   it on x86 too.

 - Generic IOMMU domain support for the Intel VT-d driver. This driver
   now makes more use of common IOMMU code to allocate default domains
   for the devices it handles.

 - An IOMMU fault reporting API to userspace. With that the IOMMU fault
   handling can be done in user-space, for example to forward the faults
   to a VM.

 - Better handling for reserved regions requested by the firmware. These
   can be 'relaxed' now, meaning that those don't prevent a device being
   attached to a VM.

 - Suspend/Resume support for the Renesas IOMMU driver.

 - Added support for dumping SVA related fields of the DMAR table in the
   Intel VT-d driver via debugfs.

 - A pile of smaller fixes and cleanups.

* tag 'iommu-updates-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (90 commits)
  iommu/omap: No need to check return value of debugfs_create functions
  iommu/arm-smmu-v3: Invalidate ATC when detaching a device
  iommu/arm-smmu-v3: Fix compilation when CONFIG_CMA=n
  iommu/vt-d: Cleanup unused variable
  iommu/amd: Flush not present cache in iommu_map_page
  iommu/amd: Only free resources once on init error
  iommu/amd: Move gart fallback to amd_iommu_init
  iommu/amd: Make iommu_disable safer
  iommu/io-pgtable: Support non-coherent page tables
  iommu/io-pgtable: Replace IO_PGTABLE_QUIRK_NO_DMA with specific flag
  iommu/io-pgtable-arm: Add support to use system cache
  iommu/arm-smmu-v3: Increase maximum size of queues
  iommu/vt-d: Silence a variable set but not used
  iommu/vt-d: Remove an unused variable "length"
  iommu: Fix integer truncation
  iommu: Add padding to struct iommu_fault
  iommu/vt-d: Consolidate domain_init() to avoid duplication
  iommu/vt-d: Cleanup after delegating DMA domain to generic iommu
  iommu/vt-d: Fix suspicious RCU usage in probe_acpi_namespace_devices()
  iommu/vt-d: Allow DMA domain attaching to rmrr locked device
  ...
---

6b04014f3f151ed62878327813859e76e8e23d78
diff --cc arch/arm64/mm/dma-mapping.c
index 1d17dbeafe76,9c588a1d6ffd..1d3f0b5a9940
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@@ -47,39 -36,12 +36,8 @@@ void arch_dma_prep_coherent(struct pag
  	__dma_flush_area(page_address(page), size);
  }
  
- #ifdef CONFIG_IOMMU_DMA
- static int __swiotlb_get_sgtable_page(struct sg_table *sgt,
- 				      struct page *page, size_t size)
- {
- 	int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
- 
- 	if (!ret)
- 		sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
- 
- 	return ret;
- }
- 
- static int __swiotlb_mmap_pfn(struct vm_area_struct *vma,
- 			      unsigned long pfn, size_t size)
- {
- 	int ret = -ENXIO;
- 	unsigned long nr_vma_pages = vma_pages(vma);
- 	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- 	unsigned long off = vma->vm_pgoff;
- 
- 	if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
- 		ret = remap_pfn_range(vma, vma->vm_start,
- 				      pfn + off,
- 				      vma->vm_end - vma->vm_start,
- 				      vma->vm_page_prot);
- 	}
- 
- 	return ret;
- }
- #endif /* CONFIG_IOMMU_DMA */
- 
  static int __init arm64_dma_init(void)
  {
 -	WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
 -		   TAINT_CPU_OUT_OF_SPEC,
 -		   "ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
 -		   ARCH_DMA_MINALIGN, cache_line_size());
  	return dma_atomic_pool_init(GFP_DMA32, __pgprot(PROT_NORMAL_NC));
  }
  arch_initcall(arm64_dma_init);
@@@ -457,16 -56,9 +52,17 @@@ void arch_teardown_dma_ops(struct devic
  void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,
  			const struct iommu_ops *iommu, bool coherent)
  {
 +	int cls = cache_line_size_of_cpu();
 +
 +	WARN_TAINT(!coherent && cls > ARCH_DMA_MINALIGN,
 +		   TAINT_CPU_OUT_OF_SPEC,
 +		   "%s %s: ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)",
 +		   dev_driver_string(dev), dev_name(dev),
 +		   ARCH_DMA_MINALIGN, cls);
 +
  	dev->dma_coherent = coherent;
- 	__iommu_setup_dma_ops(dev, dma_base, size, iommu);
+ 	if (iommu)
+ 		iommu_setup_dma_ops(dev, dma_base, size);
  
  #ifdef CONFIG_XEN
  	if (xen_initial_domain())