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author | Joerg Roedel <joerg.roedel@amd.com> | 2009-05-18 16:38:55 +0200 |
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committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-05-28 18:14:35 +0200 |
commit | 9cabe89b99773e682538a8809abc7d4000c77083 (patch) | |
tree | f3deb81b637fce3fd84d30e565b1adcd23eae338 /arch/x86/kernel/amd_iommu.c | |
parent | amd-iommu: change dma_dom->next_bit to dma_dom->next_address (diff) | |
download | linux-9cabe89b99773e682538a8809abc7d4000c77083.tar.xz linux-9cabe89b99773e682538a8809abc7d4000c77083.zip |
amd-iommu: move aperture_range allocation code to seperate function
This patch prepares the dynamic increasement of dma_ops domain
apertures.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
-rw-r--r-- | arch/x86/kernel/amd_iommu.c | 95 |
1 files changed, 59 insertions, 36 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index c1a08b9119c9..8ff02ee69e86 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -620,6 +620,59 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, * called with domain->lock held */ +/* + * This function is used to add a new aperture range to an existing + * aperture in case of dma_ops domain allocation or address allocation + * failure. + */ +static int alloc_new_range(struct dma_ops_domain *dma_dom, + bool populate, gfp_t gfp) +{ + int index = dma_dom->aperture_size >> APERTURE_RANGE_SHIFT; + + if (index >= APERTURE_MAX_RANGES) + return -ENOMEM; + + dma_dom->aperture[index] = kzalloc(sizeof(struct aperture_range), gfp); + if (!dma_dom->aperture[index]) + return -ENOMEM; + + dma_dom->aperture[index]->bitmap = (void *)get_zeroed_page(gfp); + if (!dma_dom->aperture[index]->bitmap) + goto out_free; + + dma_dom->aperture[index]->offset = dma_dom->aperture_size; + + if (populate) { + unsigned long address = dma_dom->aperture_size; + int i, num_ptes = APERTURE_RANGE_PAGES / 512; + u64 *pte, *pte_page; + + for (i = 0; i < num_ptes; ++i) { + pte = alloc_pte(&dma_dom->domain, address, + &pte_page, gfp); + if (!pte) + goto out_free; + + dma_dom->aperture[index]->pte_pages[i] = pte_page; + + address += APERTURE_RANGE_SIZE / 64; + } + } + + dma_dom->aperture_size += APERTURE_RANGE_SIZE; + + return 0; + +out_free: + free_page((unsigned long)dma_dom->aperture[index]->bitmap); + + kfree(dma_dom->aperture[index]); + dma_dom->aperture[index] = NULL; + + return -ENOMEM; +} + static unsigned long dma_ops_area_alloc(struct device *dev, struct dma_ops_domain *dom, unsigned int pages, @@ -832,9 +885,6 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu, unsigned order) { struct dma_ops_domain *dma_dom; - unsigned i, num_pte_pages; - u64 *l2_pde; - u64 address; /* * Currently the DMA aperture must be between 32 MB and 1GB in size @@ -846,11 +896,6 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu, if (!dma_dom) return NULL; - dma_dom->aperture[0] = kzalloc(sizeof(struct aperture_range), - GFP_KERNEL); - if (!dma_dom->aperture[0]) - goto free_dma_dom; - spin_lock_init(&dma_dom->domain.lock); dma_dom->domain.id = domain_id_alloc(); @@ -862,10 +907,13 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu, dma_dom->domain.priv = dma_dom; if (!dma_dom->domain.pt_root) goto free_dma_dom; - dma_dom->aperture_size = APERTURE_RANGE_SIZE; - dma_dom->aperture[0]->bitmap = (void *)get_zeroed_page(GFP_KERNEL); - if (!dma_dom->aperture[0]->bitmap) + + dma_dom->need_flush = false; + dma_dom->target_dev = 0xffff; + + if (alloc_new_range(dma_dom, true, GFP_KERNEL)) goto free_dma_dom; + /* * mark the first page as allocated so we never return 0 as * a valid dma-address. So we can use 0 as error value @@ -873,9 +921,6 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu, dma_dom->aperture[0]->bitmap[0] = 1; dma_dom->next_address = 0; - dma_dom->need_flush = false; - dma_dom->target_dev = 0xffff; - /* Intialize the exclusion range if necessary */ if (iommu->exclusion_start && iommu->exclusion_start < dma_dom->aperture_size) { @@ -886,28 +931,6 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu, dma_ops_reserve_addresses(dma_dom, startpage, pages); } - /* - * At the last step, build the page tables so we don't need to - * allocate page table pages in the dma_ops mapping/unmapping - * path for the first 128MB of dma address space. - */ - num_pte_pages = dma_dom->aperture_size / (PAGE_SIZE * 512); - - l2_pde = (u64 *)get_zeroed_page(GFP_KERNEL); - if (l2_pde == NULL) - goto free_dma_dom; - - dma_dom->domain.pt_root[0] = IOMMU_L2_PDE(virt_to_phys(l2_pde)); - - for (i = 0; i < num_pte_pages; ++i) { - u64 **pte_page = &dma_dom->aperture[0]->pte_pages[i]; - *pte_page = (u64 *)get_zeroed_page(GFP_KERNEL); - if (!*pte_page) - goto free_dma_dom; - address = virt_to_phys(*pte_page); - l2_pde[i] = IOMMU_L1_PDE(address); - } - return dma_dom; free_dma_dom: |