Lines Matching +full:dma +full:- +full:coherent
1 // SPDX-License-Identifier: GPL-2.0-only
3 * A fairly generic DMA-API to IOMMU-API glue layer.
5 * Copyright (C) 2014-2015 ARM Ltd.
7 * based in part on arch/arm/mm/dma-mapping.c:
8 * Copyright (C) 2000-2004 Russell King
13 #include <linux/dma-map-ops.h>
14 #include <linux/dma-iommu.h>
60 if (cookie->type == IOMMU_DMA_IOVA_COOKIE) in cookie_msi_granule()
61 return cookie->iovad.granule; in cookie_msi_granule()
71 INIT_LIST_HEAD(&cookie->cookie.msi_page_list); in cookie_alloc()
72 cookie->cookie.type = type; in cookie_alloc()
73 mutex_init(&cookie->mutex); in cookie_alloc()
75 return &cookie->cookie; in cookie_alloc()
79 * iommu_get_dma_cookie - Acquire DMA-API resources for a domain
80 * @domain: IOMMU domain to prepare for DMA-API usage
83 * callback when domain->type == IOMMU_DOMAIN_DMA.
87 if (domain->iova_cookie) in iommu_get_dma_cookie()
88 return -EEXIST; in iommu_get_dma_cookie()
90 domain->iova_cookie = cookie_alloc(IOMMU_DMA_IOVA_COOKIE); in iommu_get_dma_cookie()
91 if (!domain->iova_cookie) in iommu_get_dma_cookie()
92 return -ENOMEM; in iommu_get_dma_cookie()
99 * iommu_get_msi_cookie - Acquire just MSI remapping resources
103 * Users who manage their own IOVA allocation and do not want DMA API support,
114 if (domain->type != IOMMU_DOMAIN_UNMANAGED) in iommu_get_msi_cookie()
115 return -EINVAL; in iommu_get_msi_cookie()
117 if (domain->iova_cookie) in iommu_get_msi_cookie()
118 return -EEXIST; in iommu_get_msi_cookie()
122 return -ENOMEM; in iommu_get_msi_cookie()
124 cookie->msi_iova = base; in iommu_get_msi_cookie()
125 domain->iova_cookie = cookie; in iommu_get_msi_cookie()
131 * iommu_put_dma_cookie - Release a domain's DMA mapping resources
139 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iommu_put_dma_cookie()
145 if (cookie->type == IOMMU_DMA_IOVA_COOKIE && cookie->iovad.granule) in iommu_put_dma_cookie()
146 put_iova_domain(&cookie->iovad); in iommu_put_dma_cookie()
148 list_for_each_entry_safe(msi, tmp, &cookie->msi_page_list, list) { in iommu_put_dma_cookie()
149 list_del(&msi->list); in iommu_put_dma_cookie()
153 domain->iova_cookie = NULL; in iommu_put_dma_cookie()
158 * iommu_dma_get_resv_regions - Reserved region driver helper
163 * for general non-IOMMU-specific reservations. Currently, this covers GICv3
170 if (!is_of_node(dev_iommu_fwspec_get(dev)->iommu_fwnode)) in iommu_dma_get_resv_regions()
179 struct iova_domain *iovad = &cookie->iovad; in cookie_init_hw_msi_region()
183 start -= iova_offset(iovad, start); in cookie_init_hw_msi_region()
184 num_pages = iova_align(iovad, end - start) >> iova_shift(iovad); in cookie_init_hw_msi_region()
189 return -ENOMEM; in cookie_init_hw_msi_region()
191 msi_page->phys = start; in cookie_init_hw_msi_region()
192 msi_page->iova = start; in cookie_init_hw_msi_region()
193 INIT_LIST_HEAD(&msi_page->list); in cookie_init_hw_msi_region()
194 list_add(&msi_page->list, &cookie->msi_page_list); in cookie_init_hw_msi_region()
195 start += iovad->granule; in cookie_init_hw_msi_region()
204 struct pci_host_bridge *bridge = pci_find_host_bridge(dev->bus); in iova_reserve_pci_windows()
209 resource_list_for_each_entry(window, &bridge->windows) { in iova_reserve_pci_windows()
210 if (resource_type(window->res) != IORESOURCE_MEM) in iova_reserve_pci_windows()
213 lo = iova_pfn(iovad, window->res->start - window->offset); in iova_reserve_pci_windows()
214 hi = iova_pfn(iovad, window->res->end - window->offset); in iova_reserve_pci_windows()
218 /* Get reserved DMA windows from host bridge */ in iova_reserve_pci_windows()
219 resource_list_for_each_entry(window, &bridge->dma_ranges) { in iova_reserve_pci_windows()
220 end = window->res->start - window->offset; in iova_reserve_pci_windows()
228 dev_err(&dev->dev, in iova_reserve_pci_windows()
229 "Failed to reserve IOVA [%pa-%pa]\n", in iova_reserve_pci_windows()
231 return -EINVAL; in iova_reserve_pci_windows()
234 start = window->res->end - window->offset + 1; in iova_reserve_pci_windows()
236 if (window->node.next == &bridge->dma_ranges && in iova_reserve_pci_windows()
249 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iova_reserve_iommu_regions()
250 struct iova_domain *iovad = &cookie->iovad; in iova_reserve_iommu_regions()
266 if (region->type == IOMMU_RESV_SW_MSI) in iova_reserve_iommu_regions()
269 lo = iova_pfn(iovad, region->start); in iova_reserve_iommu_regions()
270 hi = iova_pfn(iovad, region->start + region->length - 1); in iova_reserve_iommu_regions()
273 if (region->type == IOMMU_RESV_MSI) in iova_reserve_iommu_regions()
274 ret = cookie_init_hw_msi_region(cookie, region->start, in iova_reserve_iommu_regions()
275 region->start + region->length); in iova_reserve_iommu_regions()
290 domain = cookie->fq_domain; in iommu_dma_flush_iotlb_all()
293 * implies that ops->flush_iotlb_all must be non-NULL. in iommu_dma_flush_iotlb_all()
295 domain->ops->flush_iotlb_all(domain); in iommu_dma_flush_iotlb_all()
299 * iommu_dma_init_domain - Initialise a DMA mapping domain
313 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iommu_dma_init_domain()
320 if (!cookie || cookie->type != IOMMU_DMA_IOVA_COOKIE) in iommu_dma_init_domain()
321 return -EINVAL; in iommu_dma_init_domain()
323 iovad = &cookie->iovad; in iommu_dma_init_domain()
326 order = __ffs(domain->pgsize_bitmap); in iommu_dma_init_domain()
330 if (domain->geometry.force_aperture) { in iommu_dma_init_domain()
331 if (base > domain->geometry.aperture_end || in iommu_dma_init_domain()
332 base + size <= domain->geometry.aperture_start) { in iommu_dma_init_domain()
333 pr_warn("specified DMA range outside IOMMU capability\n"); in iommu_dma_init_domain()
334 return -EFAULT; in iommu_dma_init_domain()
338 domain->geometry.aperture_start >> order); in iommu_dma_init_domain()
341 /* start_pfn is always nonzero for an already-initialised domain */ in iommu_dma_init_domain()
343 mutex_lock(&cookie_ext->mutex); in iommu_dma_init_domain()
344 if (iovad->start_pfn) { in iommu_dma_init_domain()
345 if (1UL << order != iovad->granule || in iommu_dma_init_domain()
346 base_pfn != iovad->start_pfn) { in iommu_dma_init_domain()
347 pr_warn("Incompatible range for DMA domain\n"); in iommu_dma_init_domain()
348 ret = -EFAULT; in iommu_dma_init_domain()
358 if (!cookie->fq_domain && !iommu_domain_get_attr(domain, in iommu_dma_init_domain()
364 cookie->fq_domain = domain; in iommu_dma_init_domain()
375 mutex_unlock(&cookie_ext->mutex); in iommu_dma_init_domain()
382 const struct iommu_ops *ops = domain->ops; in iommu_dma_deferred_attach()
387 if (unlikely(ops->is_attach_deferred && in iommu_dma_deferred_attach()
388 ops->is_attach_deferred(domain, dev))) in iommu_dma_deferred_attach()
395 * Should be called prior to using dma-apis
406 if (!domain || !domain->iova_cookie) in iommu_dma_reserve_iova()
407 return -EINVAL; in iommu_dma_reserve_iova()
409 cookie = domain->iova_cookie; in iommu_dma_reserve_iova()
410 iovad = &cookie->iovad; in iommu_dma_reserve_iova()
414 pfn_hi = iova_pfn(iovad, base + size - 1); in iommu_dma_reserve_iova()
416 return -EINVAL; in iommu_dma_reserve_iova()
423 * Should be called prior to using dma-apis.
431 if (!domain || !domain->iova_cookie) in iommu_dma_enable_best_fit_algo()
432 return -EINVAL; in iommu_dma_enable_best_fit_algo()
434 iovad = &((struct iommu_dma_cookie *)domain->iova_cookie)->iovad; in iommu_dma_enable_best_fit_algo()
435 iovad->best_fit = true; in iommu_dma_enable_best_fit_algo()
441 * dma_info_to_prot - Translate DMA API directions and attributes to IOMMU API
443 * @dir: Direction of DMA transfer
444 * @coherent: Is the DMA master cache-coherent?
445 * @attrs: DMA attributes for the mapping
449 static int dma_info_to_prot(enum dma_data_direction dir, bool coherent, in dma_info_to_prot() argument
452 int prot = coherent ? IOMMU_CACHE : 0; in dma_info_to_prot()
476 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iommu_dma_alloc_iova()
477 struct iova_domain *iovad = &cookie->iovad; in iommu_dma_alloc_iova()
480 if (cookie->type == IOMMU_DMA_MSI_COOKIE) { in iommu_dma_alloc_iova()
481 cookie->msi_iova += size; in iommu_dma_alloc_iova()
482 return cookie->msi_iova - size; in iommu_dma_alloc_iova()
488 * Freeing non-power-of-two-sized allocations back into the IOVA caches in iommu_dma_alloc_iova()
493 if (iova_len < (1 << (IOVA_RANGE_CACHE_MAX_SIZE - 1))) in iommu_dma_alloc_iova()
496 dma_limit = min_not_zero(dma_limit, dev->bus_dma_limit); in iommu_dma_alloc_iova()
498 if (domain->geometry.force_aperture) in iommu_dma_alloc_iova()
499 dma_limit = min(dma_limit, (u64)domain->geometry.aperture_end); in iommu_dma_alloc_iova()
519 struct iova_domain *iovad = &cookie->iovad; in iommu_dma_free_iova()
522 if (cookie->type == IOMMU_DMA_MSI_COOKIE) in iommu_dma_free_iova()
523 cookie->msi_iova -= size; in iommu_dma_free_iova()
524 else if (cookie->fq_domain) /* non-strict mode */ in iommu_dma_free_iova()
539 struct iommu_dma_cookie *cookie = domain->iova_cookie; in __iommu_dma_unmap()
540 struct iova_domain *iovad = &cookie->iovad; in __iommu_dma_unmap()
545 dma_addr -= iova_off; in __iommu_dma_unmap()
552 if (!cookie->fq_domain) in __iommu_dma_unmap()
561 struct iommu_dma_cookie *cookie = domain->iova_cookie; in __iommu_dma_map()
562 struct iova_domain *iovad = &cookie->iovad; in __iommu_dma_map()
575 if (iommu_map_atomic(domain, iova, phys - iova_off, size, prot)) { in __iommu_dma_map()
584 while (count--) in __iommu_dma_free_pages()
595 order_mask &= (2U << MAX_ORDER) - 1; in __iommu_dma_alloc_pages()
614 * Higher-order allocations are a convenience rather in __iommu_dma_alloc_pages()
616 * falling back to minimum-order allocations. in __iommu_dma_alloc_pages()
618 for (order_mask &= (2U << __fls(count)) - 1; in __iommu_dma_alloc_pages()
637 count -= order_size; in __iommu_dma_alloc_pages()
638 while (order_size--) in __iommu_dma_alloc_pages()
645 * iommu_dma_alloc_remap - Allocate and map a buffer contiguous in IOVA space
649 * @dma_handle: Out argument for allocated DMA handle
652 * @attrs: DMA attributes for this allocation
664 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iommu_dma_alloc_remap()
665 struct iova_domain *iovad = &cookie->iovad; in iommu_dma_alloc_remap()
666 bool coherent = dev_is_dma_coherent(dev); in iommu_dma_alloc_remap() local
667 int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs); in iommu_dma_alloc_remap()
668 unsigned int count, min_size, alloc_sizes = domain->pgsize_bitmap; in iommu_dma_alloc_remap()
679 min_size = alloc_sizes & -alloc_sizes; in iommu_dma_alloc_remap()
696 iova = iommu_dma_alloc_iova(domain, size, dev->coherent_dma_mask, dev); in iommu_dma_alloc_remap()
708 arch_dma_prep_coherent(sg_page(sg), sg->length); in iommu_dma_alloc_remap()
736 * __iommu_dma_mmap - Map a buffer into provided user VMA
785 arch_sync_dma_for_cpu(sg_phys(sg), sg->length, dir); in iommu_dma_sync_sg_for_cpu()
799 arch_sync_dma_for_device(sg_phys(sg), sg->length, dir); in iommu_dma_sync_sg_for_device()
807 bool coherent = dev_is_dma_coherent(dev); in iommu_dma_map_page() local
808 int prot = dma_info_to_prot(dir, coherent, attrs); in iommu_dma_map_page()
812 if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && in iommu_dma_map_page()
827 * Prepare a successfully-mapped scatterlist to give back to the caller.
845 unsigned int s_iova_len = s->length; in __finalise_sg()
847 s->offset += s_iova_off; in __finalise_sg()
848 s->length = s_length; in __finalise_sg()
853 * Now fill in the real DMA data. If... in __finalise_sg()
854 * - there is a valid output segment to append to in __finalise_sg()
855 * - and this segment starts on an IOVA page boundary in __finalise_sg()
856 * - but doesn't fall at a segment boundary in __finalise_sg()
857 * - and wouldn't make the resulting output segment too long in __finalise_sg()
860 (max_len - cur_len >= s_length)) { in __finalise_sg()
884 * but making sure the DMA fields are invalidated.
893 s->offset += sg_dma_address(s); in __invalidate_sg()
895 s->length = sg_dma_len(s); in __invalidate_sg()
902 * The DMA API client is passing in a scatterlist which could describe
905 * impedance-matching, to be able to hand off a suitably-aligned list,
912 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iommu_dma_map_sg()
913 struct iova_domain *iovad = &cookie->iovad; in iommu_dma_map_sg()
930 * trickery we can modify the list in-place, but reversibly, by in iommu_dma_map_sg()
931 * stashing the unaligned parts in the as-yet-unused DMA fields. in iommu_dma_map_sg()
934 size_t s_iova_off = iova_offset(iovad, s->offset); in iommu_dma_map_sg()
935 size_t s_length = s->length; in iommu_dma_map_sg()
936 size_t pad_len = (mask - iova_len + 1) & mask; in iommu_dma_map_sg()
940 s->offset -= s_iova_off; in iommu_dma_map_sg()
942 s->length = s_length; in iommu_dma_map_sg()
947 * - If mask size >= IOVA size, then the IOVA range cannot in iommu_dma_map_sg()
949 * - If mask size < IOVA size, then the IOVA range must start in iommu_dma_map_sg()
953 * - The mask must be a power of 2, so pad_len == 0 if in iommu_dma_map_sg()
957 if (pad_len && pad_len < s_length - 1) { in iommu_dma_map_sg()
958 prev->length += pad_len; in iommu_dma_map_sg()
972 * implementation - it knows better than we do. in iommu_dma_map_sg()
1001 for_each_sg(sg_next(sg), tmp, nents - 1, i) { in iommu_dma_unmap_sg()
1007 __iommu_dma_unmap(dev, start, end - start); in iommu_dma_unmap_sg()
1030 /* Non-coherent atomic allocation? Easy */ in __iommu_dma_free()
1037 * If it the address is remapped, then it's either non-coherent in __iommu_dma_free()
1045 /* Lowmem means a coherent atomic or CMA allocation */ in __iommu_dma_free()
1065 bool coherent = dev_is_dma_coherent(dev); in iommu_dma_alloc_pages() local
1077 if (IS_ENABLED(CONFIG_DMA_REMAP) && (!coherent || PageHighMem(page))) { in iommu_dma_alloc_pages()
1085 if (!coherent) in iommu_dma_alloc_pages()
1102 bool coherent = dev_is_dma_coherent(dev); in iommu_dma_alloc() local
1103 int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs); in iommu_dma_alloc()
1116 !gfpflags_allow_blocking(gfp) && !coherent) in iommu_dma_alloc()
1125 dev->coherent_dma_mask); in iommu_dma_alloc()
1167 unsigned long pfn, off = vma->vm_pgoff; in iommu_dma_mmap()
1170 vma->vm_page_prot = dma_pgprot(dev, vma->vm_page_prot, attrs); in iommu_dma_mmap()
1175 if (off >= nr_pages || vma_pages(vma) > nr_pages - off) in iommu_dma_mmap()
1176 return -ENXIO; in iommu_dma_mmap()
1188 return remap_pfn_range(vma, vma->vm_start, pfn + off, in iommu_dma_mmap()
1189 vma->vm_end - vma->vm_start, in iommu_dma_mmap()
1190 vma->vm_page_prot); in iommu_dma_mmap()
1216 sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); in iommu_dma_get_sgtable()
1224 return (1UL << __ffs(domain->pgsize_bitmap)) - 1; in iommu_dma_get_merge_boundary()
1250 * The IOMMU core code allocates the default DMA domain, which the underlying
1251 * IOMMU driver needs to support via the dma-iommu layer.
1261 * The IOMMU core code allocates the default DMA domain, which the in iommu_setup_dma_ops()
1262 * underlying IOMMU driver needs to support via the dma-iommu layer. in iommu_setup_dma_ops()
1264 if (domain->type == IOMMU_DOMAIN_DMA) { in iommu_setup_dma_ops()
1267 dev->dma_ops = &iommu_dma_ops; in iommu_setup_dma_ops()
1272 pr_warn("Failed to set up IOMMU for device %s; retaining platform DMA ops\n", in iommu_setup_dma_ops()
1279 struct iommu_dma_cookie *cookie = domain->iova_cookie; in iommu_dma_get_msi_page()
1285 msi_addr &= ~(phys_addr_t)(size - 1); in iommu_dma_get_msi_page()
1286 list_for_each_entry(msi_page, &cookie->msi_page_list, list) in iommu_dma_get_msi_page()
1287 if (msi_page->phys == msi_addr) in iommu_dma_get_msi_page()
1301 INIT_LIST_HEAD(&msi_page->list); in iommu_dma_get_msi_page()
1302 msi_page->phys = msi_addr; in iommu_dma_get_msi_page()
1303 msi_page->iova = iova; in iommu_dma_get_msi_page()
1304 list_add(&msi_page->list, &cookie->msi_page_list); in iommu_dma_get_msi_page()
1321 if (!domain || !domain->iova_cookie) { in iommu_dma_prepare_msi()
1322 desc->iommu_cookie = NULL; in iommu_dma_prepare_msi()
1338 return -ENOMEM; in iommu_dma_prepare_msi()
1351 if (!domain || !domain->iova_cookie || WARN_ON(!msi_page)) in iommu_dma_compose_msi_msg()
1354 msg->address_hi = upper_32_bits(msi_page->iova); in iommu_dma_compose_msi_msg()
1355 msg->address_lo &= cookie_msi_granule(domain->iova_cookie) - 1; in iommu_dma_compose_msi_msg()
1356 msg->address_lo += lower_32_bits(msi_page->iova); in iommu_dma_compose_msi_msg()