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amd-iommu: introduce aperture_range structure
This is a preperation for extended address allocator. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
parent
41fb454ebe
commit
c3239567a2
2 changed files with 43 additions and 35 deletions
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@ -195,6 +195,8 @@
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#define PD_DEFAULT_MASK (1UL << 1) /* domain is a default dma_ops
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domain for an IOMMU */
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#define APERTURE_RANGE_SIZE (128 * 1024 * 1024)
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/*
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* This structure contains generic data for IOMMU protection domains
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* independent of their use.
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@ -209,6 +211,24 @@ struct protection_domain {
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void *priv; /* private data */
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};
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/*
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* For dynamic growth the aperture size is split into ranges of 128MB of
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* DMA address space each. This struct represents one such range.
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*/
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struct aperture_range {
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/* address allocation bitmap */
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unsigned long *bitmap;
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/*
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* Array of PTE pages for the aperture. In this array we save all the
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* leaf pages of the domain page table used for the aperture. This way
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* we don't need to walk the page table to find a specific PTE. We can
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* just calculate its address in constant time.
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*/
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u64 *pte_pages[64];
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};
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/*
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* Data container for a dma_ops specific protection domain
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*/
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@ -224,16 +244,8 @@ struct dma_ops_domain {
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/* address we start to search for free addresses */
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unsigned long next_bit;
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/* address allocation bitmap */
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unsigned long *bitmap;
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/*
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* Array of PTE pages for the aperture. In this array we save all the
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* leaf pages of the domain page table used for the aperture. This way
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* we don't need to walk the page table to find a specific PTE. We can
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* just calculate its address in constant time.
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*/
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u64 **pte_pages;
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/* address space relevant data */
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struct aperture_range aperture;
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/* This will be set to true when TLB needs to be flushed */
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bool need_flush;
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@ -595,7 +595,8 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
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* as allocated in the aperture
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*/
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if (addr < dma_dom->aperture_size)
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__set_bit(addr >> PAGE_SHIFT, dma_dom->bitmap);
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__set_bit(addr >> PAGE_SHIFT,
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dma_dom->aperture.bitmap);
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}
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return 0;
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@ -656,11 +657,12 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
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dom->need_flush = true;
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}
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address = iommu_area_alloc(dom->bitmap, limit, dom->next_bit, pages,
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0 , boundary_size, align_mask);
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address = iommu_area_alloc(dom->aperture.bitmap, limit, dom->next_bit,
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pages, 0 , boundary_size, align_mask);
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if (address == -1) {
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address = iommu_area_alloc(dom->bitmap, limit, 0, pages,
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0, boundary_size, align_mask);
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address = iommu_area_alloc(dom->aperture.bitmap, limit, 0,
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pages, 0, boundary_size,
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align_mask);
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dom->need_flush = true;
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}
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@ -685,7 +687,7 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom,
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unsigned int pages)
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{
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address >>= PAGE_SHIFT;
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iommu_area_free(dom->bitmap, address, pages);
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iommu_area_free(dom->aperture.bitmap, address, pages);
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if (address >= dom->next_bit)
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dom->need_flush = true;
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@ -741,7 +743,7 @@ static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
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if (start_page + pages > last_page)
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pages = last_page - start_page;
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iommu_area_reserve(dom->bitmap, start_page, pages);
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iommu_area_reserve(dom->aperture.bitmap, start_page, pages);
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}
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static void free_pagetable(struct protection_domain *domain)
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@ -785,9 +787,7 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom)
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free_pagetable(&dom->domain);
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kfree(dom->pte_pages);
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kfree(dom->bitmap);
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free_page((unsigned long)dom->aperture.bitmap);
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kfree(dom);
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}
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@ -826,16 +826,15 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
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dma_dom->domain.priv = dma_dom;
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if (!dma_dom->domain.pt_root)
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goto free_dma_dom;
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dma_dom->aperture_size = (1ULL << order);
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dma_dom->bitmap = kzalloc(dma_dom->aperture_size / (PAGE_SIZE * 8),
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GFP_KERNEL);
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if (!dma_dom->bitmap)
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dma_dom->aperture_size = APERTURE_RANGE_SIZE;
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dma_dom->aperture.bitmap = (void *)get_zeroed_page(GFP_KERNEL);
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if (!dma_dom->aperture.bitmap)
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goto free_dma_dom;
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/*
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* mark the first page as allocated so we never return 0 as
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* a valid dma-address. So we can use 0 as error value
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*/
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dma_dom->bitmap[0] = 1;
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dma_dom->aperture.bitmap[0] = 1;
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dma_dom->next_bit = 0;
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dma_dom->need_flush = false;
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@ -854,13 +853,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
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/*
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* At the last step, build the page tables so we don't need to
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* allocate page table pages in the dma_ops mapping/unmapping
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* path.
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* path for the first 128MB of dma address space.
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*/
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num_pte_pages = dma_dom->aperture_size / (PAGE_SIZE * 512);
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dma_dom->pte_pages = kzalloc(num_pte_pages * sizeof(void *),
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GFP_KERNEL);
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if (!dma_dom->pte_pages)
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goto free_dma_dom;
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l2_pde = (u64 *)get_zeroed_page(GFP_KERNEL);
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if (l2_pde == NULL)
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@ -869,10 +864,11 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu,
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dma_dom->domain.pt_root[0] = IOMMU_L2_PDE(virt_to_phys(l2_pde));
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for (i = 0; i < num_pte_pages; ++i) {
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dma_dom->pte_pages[i] = (u64 *)get_zeroed_page(GFP_KERNEL);
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if (!dma_dom->pte_pages[i])
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u64 **pte_page = &dma_dom->aperture.pte_pages[i];
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*pte_page = (u64 *)get_zeroed_page(GFP_KERNEL);
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if (!*pte_page)
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goto free_dma_dom;
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address = virt_to_phys(dma_dom->pte_pages[i]);
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address = virt_to_phys(*pte_page);
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l2_pde[i] = IOMMU_L1_PDE(address);
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}
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@ -1159,7 +1155,7 @@ static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
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paddr &= PAGE_MASK;
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pte = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
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pte = dom->aperture.pte_pages[IOMMU_PTE_L1_INDEX(address)];
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pte += IOMMU_PTE_L0_INDEX(address);
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__pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
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@ -1192,7 +1188,7 @@ static void dma_ops_domain_unmap(struct amd_iommu *iommu,
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WARN_ON(address & ~PAGE_MASK || address >= dom->aperture_size);
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pte = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
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pte = dom->aperture.pte_pages[IOMMU_PTE_L1_INDEX(address)];
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pte += IOMMU_PTE_L0_INDEX(address);
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WARN_ON(!*pte);
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