diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/intel-iommu.c | 232 |
1 files changed, 187 insertions, 45 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c index 6472bf1..f5934fc 100644 --- a/drivers/iommu/intel-iommu.c +++ b/drivers/iommu/intel-iommu.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2006, Intel Corporation. + * Copyright © 2006-2014 Intel Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, @@ -10,15 +10,11 @@ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. * - * You should have received a copy of the GNU General Public License along with - * this program; if not, write to the Free Software Foundation, Inc., 59 Temple - * Place - Suite 330, Boston, MA 02111-1307 USA. - * - * Copyright (C) 2006-2008 Intel Corporation - * Author: Ashok Raj <ashok.raj@intel.com> - * Author: Shaohua Li <shaohua.li@intel.com> - * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com> - * Author: Fenghua Yu <fenghua.yu@intel.com> + * Authors: David Woodhouse <dwmw2@infradead.org>, + * Ashok Raj <ashok.raj@intel.com>, + * Shaohua Li <shaohua.li@intel.com>, + * Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>, + * Fenghua Yu <fenghua.yu@intel.com> */ #include <linux/init.h> @@ -413,6 +409,7 @@ struct deferred_flush_tables { int next; struct iova *iova[HIGH_WATER_MARK]; struct dmar_domain *domain[HIGH_WATER_MARK]; + struct page *freelist[HIGH_WATER_MARK]; }; static struct deferred_flush_tables *deferred_flush; @@ -961,6 +958,123 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain, } } +/* When a page at a given level is being unlinked from its parent, we don't + need to *modify* it at all. All we need to do is make a list of all the + pages which can be freed just as soon as we've flushed the IOTLB and we + know the hardware page-walk will no longer touch them. + The 'pte' argument is the *parent* PTE, pointing to the page that is to + be freed. */ +static struct page *dma_pte_list_pagetables(struct dmar_domain *domain, + int level, struct dma_pte *pte, + struct page *freelist) +{ + struct page *pg; + + pg = pfn_to_page(dma_pte_addr(pte) >> PAGE_SHIFT); + pg->freelist = freelist; + freelist = pg; + + if (level == 1) + return freelist; + + for (pte = page_address(pg); !first_pte_in_page(pte); pte++) { + if (dma_pte_present(pte) && !dma_pte_superpage(pte)) + freelist = dma_pte_list_pagetables(domain, level - 1, + pte, freelist); + } + + return freelist; +} + +static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level, + struct dma_pte *pte, unsigned long pfn, + unsigned long start_pfn, + unsigned long last_pfn, + struct page *freelist) +{ + struct dma_pte *first_pte = NULL, *last_pte = NULL; + + pfn = max(start_pfn, pfn); + pte = &pte[pfn_level_offset(pfn, level)]; + + do { + unsigned long level_pfn; + + if (!dma_pte_present(pte)) + goto next; + + level_pfn = pfn & level_mask(level); + + /* If range covers entire pagetable, free it */ + if (start_pfn <= level_pfn && + last_pfn >= level_pfn + level_size(level) - 1) { + /* These suborbinate page tables are going away entirely. Don't + bother to clear them; we're just going to *free* them. */ + if (level > 1 && !dma_pte_superpage(pte)) + freelist = dma_pte_list_pagetables(domain, level - 1, pte, freelist); + + dma_clear_pte(pte); + if (!first_pte) + first_pte = pte; + last_pte = pte; + } else if (level > 1) { + /* Recurse down into a level that isn't *entirely* obsolete */ + freelist = dma_pte_clear_level(domain, level - 1, + phys_to_virt(dma_pte_addr(pte)), + level_pfn, start_pfn, last_pfn, + freelist); + } +next: + pfn += level_size(level); + } while (!first_pte_in_page(++pte) && pfn <= last_pfn); + + if (first_pte) + domain_flush_cache(domain, first_pte, + (void *)++last_pte - (void *)first_pte); + + return freelist; +} + +/* We can't just free the pages because the IOMMU may still be walking + the page tables, and may have cached the intermediate levels. The + pages can only be freed after the IOTLB flush has been done. */ +struct page *domain_unmap(struct dmar_domain *domain, + unsigned long start_pfn, + unsigned long last_pfn) +{ + int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; + struct page *freelist = NULL; + + BUG_ON(addr_width < BITS_PER_LONG && start_pfn >> addr_width); + BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width); + BUG_ON(start_pfn > last_pfn); + + /* we don't need lock here; nobody else touches the iova range */ + freelist = dma_pte_clear_level(domain, agaw_to_level(domain->agaw), + domain->pgd, 0, start_pfn, last_pfn, NULL); + + /* free pgd */ + if (start_pfn == 0 && last_pfn == DOMAIN_MAX_PFN(domain->gaw)) { + struct page *pgd_page = virt_to_page(domain->pgd); + pgd_page->freelist = freelist; + freelist = pgd_page; + + domain->pgd = NULL; + } + + return freelist; +} + +void dma_free_pagelist(struct page *freelist) +{ + struct page *pg; + + while ((pg = freelist)) { + freelist = pg->freelist; + free_pgtable_page(page_address(pg)); + } +} + /* iommu handling */ static int iommu_alloc_root_entry(struct intel_iommu *iommu) { @@ -1070,7 +1184,7 @@ static void __iommu_flush_iotlb(struct intel_iommu *iommu, u16 did, break; case DMA_TLB_PSI_FLUSH: val = DMA_TLB_PSI_FLUSH|DMA_TLB_IVT|DMA_TLB_DID(did); - /* Note: always flush non-leaf currently */ + /* IH bit is passed in as part of address */ val_iva = size_order | addr; break; default: @@ -1181,13 +1295,15 @@ static void iommu_flush_dev_iotlb(struct dmar_domain *domain, } static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did, - unsigned long pfn, unsigned int pages, int map) + unsigned long pfn, unsigned int pages, int ih, int map) { unsigned int mask = ilog2(__roundup_pow_of_two(pages)); uint64_t addr = (uint64_t)pfn << VTD_PAGE_SHIFT; BUG_ON(pages == 0); + if (ih) + ih = 1 << 6; /* * Fallback to domain selective flush if no PSI support or the size is * too big. @@ -1198,7 +1314,7 @@ static void iommu_flush_iotlb_psi(struct intel_iommu *iommu, u16 did, iommu->flush.flush_iotlb(iommu, did, 0, 0, DMA_TLB_DSI_FLUSH); else - iommu->flush.flush_iotlb(iommu, did, addr, mask, + iommu->flush.flush_iotlb(iommu, did, addr | ih, mask, DMA_TLB_PSI_FLUSH); /* @@ -1523,6 +1639,7 @@ static void domain_exit(struct dmar_domain *domain) { struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; + struct page *freelist = NULL; /* Domain 0 is reserved, so dont process it */ if (!domain) @@ -1538,11 +1655,7 @@ static void domain_exit(struct dmar_domain *domain) /* destroy iovas */ put_iova_domain(&domain->iovad); - /* clear ptes */ - dma_pte_clear_range(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); - - /* free page tables */ - dma_pte_free_pagetable(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); + freelist = domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw)); /* clear attached or cached domains */ rcu_read_lock(); @@ -1552,6 +1665,8 @@ static void domain_exit(struct dmar_domain *domain) iommu_detach_domain(domain, iommu); rcu_read_unlock(); + dma_free_pagelist(freelist); + free_domain_mem(domain); } @@ -2851,7 +2966,7 @@ static dma_addr_t __intel_map_single(struct device *hwdev, phys_addr_t paddr, /* it's a non-present to present mapping. Only flush if caching mode */ if (cap_caching_mode(iommu->cap)) - iommu_flush_iotlb_psi(iommu, domain->id, mm_to_dma_pfn(iova->pfn_lo), size, 1); + iommu_flush_iotlb_psi(iommu, domain->id, mm_to_dma_pfn(iova->pfn_lo), size, 0, 1); else iommu_flush_write_buffer(iommu); @@ -2903,13 +3018,16 @@ static void flush_unmaps(void) /* On real hardware multiple invalidations are expensive */ if (cap_caching_mode(iommu->cap)) iommu_flush_iotlb_psi(iommu, domain->id, - iova->pfn_lo, iova->pfn_hi - iova->pfn_lo + 1, 0); + iova->pfn_lo, iova->pfn_hi - iova->pfn_lo + 1, + !deferred_flush[i].freelist[j], 0); else { mask = ilog2(mm_to_dma_pfn(iova->pfn_hi - iova->pfn_lo + 1)); iommu_flush_dev_iotlb(deferred_flush[i].domain[j], (uint64_t)iova->pfn_lo << PAGE_SHIFT, mask); } __free_iova(&deferred_flush[i].domain[j]->iovad, iova); + if (deferred_flush[i].freelist[j]) + dma_free_pagelist(deferred_flush[i].freelist[j]); } deferred_flush[i].next = 0; } @@ -2926,7 +3044,7 @@ static void flush_unmaps_timeout(unsigned long data) spin_unlock_irqrestore(&async_umap_flush_lock, flags); } -static void add_unmap(struct dmar_domain *dom, struct iova *iova) +static void add_unmap(struct dmar_domain *dom, struct iova *iova, struct page *freelist) { unsigned long flags; int next, iommu_id; @@ -2942,6 +3060,7 @@ static void add_unmap(struct dmar_domain *dom, struct iova *iova) next = deferred_flush[iommu_id].next; deferred_flush[iommu_id].domain[next] = dom; deferred_flush[iommu_id].iova[next] = iova; + deferred_flush[iommu_id].freelist[next] = freelist; deferred_flush[iommu_id].next++; if (!timer_on) { @@ -2961,6 +3080,7 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, unsigned long start_pfn, last_pfn; struct iova *iova; struct intel_iommu *iommu; + struct page *freelist; if (iommu_no_mapping(dev)) return; @@ -2981,19 +3101,16 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr, pr_debug("Device %s unmapping: pfn %lx-%lx\n", pci_name(pdev), start_pfn, last_pfn); - /* clear the whole page */ - dma_pte_clear_range(domain, start_pfn, last_pfn); - - /* free page tables */ - dma_pte_free_pagetable(domain, start_pfn, last_pfn); + freelist = domain_unmap(domain, start_pfn, last_pfn); if (intel_iommu_strict) { iommu_flush_iotlb_psi(iommu, domain->id, start_pfn, - last_pfn - start_pfn + 1, 0); + last_pfn - start_pfn + 1, !freelist, 0); /* free iova */ __free_iova(&domain->iovad, iova); + dma_free_pagelist(freelist); } else { - add_unmap(domain, iova); + add_unmap(domain, iova, freelist); /* * queue up the release of the unmap to save the 1/6th of the * cpu used up by the iotlb flush operation... @@ -3055,6 +3172,7 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist, unsigned long start_pfn, last_pfn; struct iova *iova; struct intel_iommu *iommu; + struct page *freelist; if (iommu_no_mapping(hwdev)) return; @@ -3072,19 +3190,16 @@ static void intel_unmap_sg(struct device *hwdev, struct scatterlist *sglist, start_pfn = mm_to_dma_pfn(iova->pfn_lo); last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1; - /* clear the whole page */ - dma_pte_clear_range(domain, start_pfn, last_pfn); - - /* free page tables */ - dma_pte_free_pagetable(domain, start_pfn, last_pfn); + freelist = domain_unmap(domain, start_pfn, last_pfn); if (intel_iommu_strict) { iommu_flush_iotlb_psi(iommu, domain->id, start_pfn, - last_pfn - start_pfn + 1, 0); + last_pfn - start_pfn + 1, !freelist, 0); /* free iova */ __free_iova(&domain->iovad, iova); + dma_free_pagelist(freelist); } else { - add_unmap(domain, iova); + add_unmap(domain, iova, freelist); /* * queue up the release of the unmap to save the 1/6th of the * cpu used up by the iotlb flush operation... @@ -3167,7 +3282,7 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne /* it's a non-present to present mapping. Only flush if caching mode */ if (cap_caching_mode(iommu->cap)) - iommu_flush_iotlb_psi(iommu, domain->id, start_vpfn, size, 1); + iommu_flush_iotlb_psi(iommu, domain->id, start_vpfn, size, 0, 1); else iommu_flush_write_buffer(iommu); @@ -3714,6 +3829,7 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb, struct iova *iova; struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; + struct page *freelist; iova = find_iova(&si_domain->iovad, start_vpfn); if (iova == NULL) { @@ -3730,16 +3846,17 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb, return NOTIFY_BAD; } + freelist = domain_unmap(si_domain, iova->pfn_lo, + iova->pfn_hi); + rcu_read_lock(); for_each_active_iommu(iommu, drhd) iommu_flush_iotlb_psi(iommu, si_domain->id, iova->pfn_lo, - iova->pfn_hi - iova->pfn_lo + 1, 0); + iova->pfn_hi - iova->pfn_lo + 1, + !freelist, 0); rcu_read_unlock(); - dma_pte_clear_range(si_domain, iova->pfn_lo, - iova->pfn_hi); - dma_pte_free_pagetable(si_domain, iova->pfn_lo, - iova->pfn_hi); + dma_free_pagelist(freelist); start_vpfn = iova->pfn_hi + 1; free_iova_mem(iova); @@ -4100,10 +4217,14 @@ static int intel_iommu_map(struct iommu_domain *domain, } static size_t intel_iommu_unmap(struct iommu_domain *domain, - unsigned long iova, size_t size) + unsigned long iova, size_t size) { struct dmar_domain *dmar_domain = domain->priv; - int level = 0; + struct page *freelist = NULL; + struct intel_iommu *iommu; + unsigned long start_pfn, last_pfn; + unsigned int npages; + int iommu_id, num, ndomains, level = 0; /* Cope with horrid API which requires us to unmap more than the size argument if it happens to be a large-page mapping. */ @@ -4113,8 +4234,29 @@ static size_t intel_iommu_unmap(struct iommu_domain *domain, if (size < VTD_PAGE_SIZE << level_to_offset_bits(level)) size = VTD_PAGE_SIZE << level_to_offset_bits(level); - dma_pte_clear_range(dmar_domain, iova >> VTD_PAGE_SHIFT, - (iova + size - 1) >> VTD_PAGE_SHIFT); + start_pfn = iova >> VTD_PAGE_SHIFT; + last_pfn = (iova + size - 1) >> VTD_PAGE_SHIFT; + + freelist = domain_unmap(dmar_domain, start_pfn, last_pfn); + + npages = last_pfn - start_pfn + 1; + + for_each_set_bit(iommu_id, dmar_domain->iommu_bmp, g_num_of_iommus) { + iommu = g_iommus[iommu_id]; + + /* + * find bit position of dmar_domain + */ + ndomains = cap_ndoms(iommu->cap); + for_each_set_bit(num, iommu->domain_ids, ndomains) { + if (iommu->domains[num] == dmar_domain) + iommu_flush_iotlb_psi(iommu, num, start_pfn, + npages, !freelist, 0); + } + + } + + dma_free_pagelist(freelist); if (dmar_domain->max_addr == iova + size) dmar_domain->max_addr = iova; |
