[v2,08/11] iommu/vt-d: Use put_pages_list

Message ID	351091d875d37c6e15504b9269b0aef0f1979c19.1639157090.git.robin.murphy@arm.com (mailing list archive)
State	New
Headers	show Return-Path: <owner-linux-mm@kvack.org> From: Robin Murphy <robin.murphy@arm.com> To: joro@8bytes.org, will@kernel.org Cc: iommu@lists.linux-foundation.org, suravee.suthikulpanit@amd.com, baolu.lu@linux.intel.com, willy@infradead.org, linux-kernel@vger.kernel.org, john.garry@huawei.com, linux-mm@kvack.org Subject: [PATCH v2 08/11] iommu/vt-d: Use put_pages_list Date: Fri, 10 Dec 2021 17:54:49 +0000 Message-Id: <351091d875d37c6e15504b9269b0aef0f1979c19.1639157090.git.robin.murphy@arm.com> In-Reply-To: <cover.1639157090.git.robin.murphy@arm.com> References: <cover.1639157090.git.robin.murphy@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org Precedence: bulk
Series	iommu: refactor flush queues into iommu-dma \| expand [v2,00/11] iommu: refactor flush queues into iommu-dma [v2,01/11] iommu/iova: Fix race between FQ timeout and teardown [v2,02/11] gpu: host1x: Add missing DMA API include [v2,03/11] drm/tegra: vic: Fix DMA API misuse [v2,04/11] iommu/iova: Squash entry_dtor abstraction [v2,05/11] iommu/iova: Squash flush_cb abstraction [v2,06/11] iommu/amd: Simplify pagetable freeing [v2,07/11] iommu/amd: Use put_pages_list [v2,08/11] iommu/vt-d: Use put_pages_list [v2,09/11] iommu/iova: Consolidate flush queue code [v2,10/11] iommu/iova: Move flush queue code to iommu-dma [v2,11/11] iommu: Move flush queue data into iommu_dma_cookie

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index cde887530549..f139b77caee0 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -455,7 +455,7 @@ static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie, else if (gather && gather->queued) queue_iova(iovad, iova_pfn(iovad, iova), size >> iova_shift(iovad), - gather->freelist); + &gather->freelist); else free_iova_fast(iovad, iova_pfn(iovad, iova), size >> iova_shift(iovad)); diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index b6a8f3282411..17b3d97111f3 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -1303,35 +1303,30 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain, 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) +static void dma_pte_list_pagetables(struct dmar_domain *domain, + int level, struct dma_pte *pte, + struct list_head *freelist) { struct page *pg; pg = pfn_to_page(dma_pte_addr(pte) >> PAGE_SHIFT); - pg->freelist = freelist; - freelist = pg; + list_add_tail(&pg->lru, freelist); if (level == 1) - return freelist; + return; pte = page_address(pg); do { if (dma_pte_present(pte) && !dma_pte_superpage(pte)) - freelist = dma_pte_list_pagetables(domain, level - 1, - pte, freelist); + dma_pte_list_pagetables(domain, level - 1, pte, freelist); pte++; } while (!first_pte_in_page(pte)); - - 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) +static void 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 list_head *freelist) { struct dma_pte *first_pte = NULL, *last_pte = NULL; @@ -1350,7 +1345,7 @@ static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level, /* 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_pte_list_pagetables(domain, level - 1, pte, freelist); dma_clear_pte(pte); if (!first_pte) @@ -1358,10 +1353,10 @@ static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level, 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); + dma_pte_clear_level(domain, level - 1, + phys_to_virt(dma_pte_addr(pte)), + level_pfn, start_pfn, last_pfn, + freelist); } next: pfn = level_pfn + level_size(level); @@ -1370,47 +1365,28 @@ static struct page *dma_pte_clear_level(struct dmar_domain *domain, int level, 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. */ -static struct page *domain_unmap(struct dmar_domain *domain, - unsigned long start_pfn, - unsigned long last_pfn, - struct page *freelist) +static void domain_unmap(struct dmar_domain *domain, unsigned long start_pfn, + unsigned long last_pfn, struct list_head *freelist) { BUG_ON(!domain_pfn_supported(domain, start_pfn)); BUG_ON(!domain_pfn_supported(domain, last_pfn)); 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, - freelist); + dma_pte_clear_level(domain, agaw_to_level(domain->agaw), + domain->pgd, 0, start_pfn, last_pfn, freelist); /* 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; - + list_add_tail(&pgd_page->lru, freelist); domain->pgd = NULL; } - - return freelist; -} - -static void dma_free_pagelist(struct page *freelist) -{ - struct page *pg; - - while ((pg = freelist)) { - freelist = pg->freelist; - free_pgtable_page(page_address(pg)); - } } /* iommu handling */ @@ -2095,11 +2071,10 @@ static void domain_exit(struct dmar_domain *domain) domain_remove_dev_info(domain); if (domain->pgd) { - struct page *freelist; + LIST_HEAD(freelist); - freelist = domain_unmap(domain, 0, - DOMAIN_MAX_PFN(domain->gaw), NULL); - dma_free_pagelist(freelist); + domain_unmap(domain, 0, DOMAIN_MAX_PFN(domain->gaw), &freelist); + put_pages_list(&freelist); } free_domain_mem(domain); @@ -4192,19 +4167,17 @@ static int intel_iommu_memory_notifier(struct notifier_block *nb, { struct dmar_drhd_unit *drhd; struct intel_iommu *iommu; - struct page *freelist; + LIST_HEAD(freelist); - freelist = domain_unmap(si_domain, - start_vpfn, last_vpfn, - NULL); + domain_unmap(si_domain, start_vpfn, last_vpfn, &freelist); rcu_read_lock(); for_each_active_iommu(iommu, drhd) iommu_flush_iotlb_psi(iommu, si_domain, start_vpfn, mhp->nr_pages, - !freelist, 0); + list_empty(&freelist), 0); rcu_read_unlock(); - dma_free_pagelist(freelist); + put_pages_list(&freelist); } break; } @@ -5211,8 +5184,7 @@ static size_t intel_iommu_unmap(struct iommu_domain *domain, start_pfn = iova >> VTD_PAGE_SHIFT; last_pfn = (iova + size - 1) >> VTD_PAGE_SHIFT; - gather->freelist = domain_unmap(dmar_domain, start_pfn, - last_pfn, gather->freelist); + domain_unmap(dmar_domain, start_pfn, last_pfn, &gather->freelist); if (dmar_domain->max_addr == iova + size) dmar_domain->max_addr = iova; @@ -5248,9 +5220,10 @@ static void intel_iommu_tlb_sync(struct iommu_domain *domain, for_each_domain_iommu(iommu_id, dmar_domain) iommu_flush_iotlb_psi(g_iommus[iommu_id], dmar_domain, - start_pfn, nrpages, !gather->freelist, 0); + start_pfn, nrpages, + list_empty(&gather->freelist), 0); - dma_free_pagelist(gather->freelist); + put_pages_list(&gather->freelist); } static phys_addr_t intel_iommu_iova_to_phys(struct iommu_domain *domain, diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c index 76bc6f39fac7..a0250cebcdcf 100644 --- a/drivers/iommu/iova.c +++ b/drivers/iommu/iova.c @@ -96,7 +96,7 @@ static void free_iova_flush_queue(struct iova_domain *iovad) int init_iova_flush_queue(struct iova_domain *iovad, struct iommu_domain *fq_domain) { struct iova_fq __percpu *queue; - int cpu; + int i, cpu; atomic64_set(&iovad->fq_flush_start_cnt, 0); atomic64_set(&iovad->fq_flush_finish_cnt, 0); @@ -113,6 +113,9 @@ int init_iova_flush_queue(struct iova_domain *iovad, struct iommu_domain *fq_dom fq->tail = 0; spin_lock_init(&fq->lock); + + for (i = 0; i < IOVA_FQ_SIZE; i++) + INIT_LIST_HEAD(&fq->entries[i].freelist); } iovad->fq_domain = fq_domain; @@ -534,16 +537,6 @@ free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size) } EXPORT_SYMBOL_GPL(free_iova_fast); -static void fq_entry_dtor(struct page *freelist) -{ - while (freelist) { - unsigned long p = (unsigned long)page_address(freelist); - - freelist = freelist->freelist; - free_page(p); - } -} - #define fq_ring_for_each(i, fq) \ for ((i) = (fq)->head; (i) != (fq)->tail; (i) = ((i) + 1) % IOVA_FQ_SIZE) @@ -576,7 +569,7 @@ static void fq_ring_free(struct iova_domain *iovad, struct iova_fq *fq) if (fq->entries[idx].counter >= counter) break; - fq_entry_dtor(fq->entries[idx].freelist); + put_pages_list(&fq->entries[idx].freelist); free_iova_fast(iovad, fq->entries[idx].iova_pfn, fq->entries[idx].pages); @@ -598,15 +591,14 @@ static void fq_destroy_all_entries(struct iova_domain *iovad) /* * This code runs when the iova_domain is being detroyed, so don't - * bother to free iovas, just call the entry_dtor on all remaining - * entries. + * bother to free iovas, just free any remaining pagetable pages. */ for_each_possible_cpu(cpu) { struct iova_fq *fq = per_cpu_ptr(iovad->fq, cpu); int idx; fq_ring_for_each(idx, fq) - fq_entry_dtor(fq->entries[idx].freelist); + put_pages_list(&fq->entries[idx].freelist); } } @@ -631,7 +623,7 @@ static void fq_flush_timeout(struct timer_list *t) void queue_iova(struct iova_domain *iovad, unsigned long pfn, unsigned long pages, - struct page *freelist) + struct list_head *freelist) { struct iova_fq *fq; unsigned long flags; @@ -665,8 +657,8 @@ void queue_iova(struct iova_domain *iovad, fq->entries[idx].iova_pfn = pfn; fq->entries[idx].pages = pages; - fq->entries[idx].freelist = freelist; fq->entries[idx].counter = atomic64_read(&iovad->fq_flush_start_cnt); + list_splice(freelist, &fq->entries[idx].freelist); spin_unlock_irqrestore(&fq->lock, flags); diff --git a/include/linux/iommu.h b/include/linux/iommu.h index d2f3435e7d17..de0c57a567c8 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -186,7 +186,7 @@ struct iommu_iotlb_gather { unsigned long start; unsigned long end; size_t pgsize; - struct page *freelist; + struct list_head freelist; bool queued; }; @@ -399,6 +399,7 @@ static inline void iommu_iotlb_gather_init(struct iommu_iotlb_gather *gather) { *gather = (struct iommu_iotlb_gather) { .start = ULONG_MAX, + .freelist = LIST_HEAD_INIT(gather->freelist), }; } diff --git a/include/linux/iova.h b/include/linux/iova.h index 99be4fcea4f3..072a09c06e8a 100644 --- a/include/linux/iova.h +++ b/include/linux/iova.h @@ -46,7 +46,7 @@ struct iova_rcache { struct iova_fq_entry { unsigned long iova_pfn; unsigned long pages; - struct page *freelist; + struct list_head freelist; u64 counter; /* Flush counter when this entrie was added */ }; @@ -135,7 +135,7 @@ void free_iova_fast(struct iova_domain *iovad, unsigned long pfn, unsigned long size); void queue_iova(struct iova_domain *iovad, unsigned long pfn, unsigned long pages, - struct page *freelist); + struct list_head *freelist); unsigned long alloc_iova_fast(struct iova_domain *iovad, unsigned long size, unsigned long limit_pfn, bool flush_rcache); struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,

[v2,08/11] iommu/vt-d: Use put_pages_list

Commit Message

Patch