linux-kernel - Re: [PATCH] iommu/amd: Pass gfp flags to iommu_map_page() in amd_iommu

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Date:   Fri, 18 Oct 2019 12:27:50 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Joerg Roedel <joro@...tes.org>
Cc:     Qian Cai <cai@....pw>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH] iommu/amd: Pass gfp flags to iommu_map_page() in
 amd_iommu_map()

Did you get a chance to look at iommu_dma_alloc_remap() as well?

drivers/iommu/dma-iommu.c
   584  static void *iommu_dma_alloc_remap(struct device *dev, size_t size,
   585                  dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
                                                ^^^^^^^^^
   586  {
   587          struct iommu_domain *domain = iommu_get_dma_domain(dev);
   588          struct iommu_dma_cookie *cookie = domain->iova_cookie;
   589          struct iova_domain *iovad = &cookie->iovad;
   590          bool coherent = dev_is_dma_coherent(dev);
   591          int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
   592          pgprot_t prot = dma_pgprot(dev, PAGE_KERNEL, attrs);
   593          unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap;
   594          struct page **pages;
   595          struct sg_table sgt;
   596          dma_addr_t iova;
   597          void *vaddr;
   598  
   599          *dma_handle = DMA_MAPPING_ERROR;
   600  
   601          if (unlikely(iommu_dma_deferred_attach(dev, domain)))
   602                  return NULL;
   603  
   604          min_size = alloc_sizes & -alloc_sizes;
   605          if (min_size < PAGE_SIZE) {
   606                  min_size = PAGE_SIZE;
   607                  alloc_sizes |= PAGE_SIZE;
   608          } else {
   609                  size = ALIGN(size, min_size);
   610          }
   611          if (attrs & DMA_ATTR_ALLOC_SINGLE_PAGES)
   612                  alloc_sizes = min_size;
   613  
   614          count = PAGE_ALIGN(size) >> PAGE_SHIFT;
   615          pages = __iommu_dma_alloc_pages(dev, count, alloc_sizes >> PAGE_SHIFT,
   616                                          gfp);
   617          if (!pages)
   618                  return NULL;
   619  
   620          size = iova_align(iovad, size);
   621          iova = iommu_dma_alloc_iova(domain, size, dev->coherent_dma_mask, dev);
   622          if (!iova)
   623                  goto out_free_pages;
   624  
   625          if (sg_alloc_table_from_pages(&sgt, pages, count, 0, size, GFP_KERNEL))
                                                                           ^^^^^^^^^^
gfp here instead of GFP_KERNEL?

   626                  goto out_free_iova;
   627  
   628          if (!(ioprot & IOMMU_CACHE)) {

regards,
dan carpenter