diff options
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 1293 |
1 files changed, 711 insertions, 582 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 0285521e0a99..b990b5cc9541 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2007-2008 Advanced Micro Devices, Inc. + * Copyright (C) 2007-2009 Advanced Micro Devices, Inc. * Author: Joerg Roedel <joerg.roedel@amd.com> * Leo Duran <leo.duran@amd.com> * @@ -28,6 +28,7 @@ #include <asm/proto.h> #include <asm/iommu.h> #include <asm/gart.h> +#include <asm/amd_iommu_proto.h> #include <asm/amd_iommu_types.h> #include <asm/amd_iommu.h> @@ -56,20 +57,152 @@ struct iommu_cmd { u32 data[4]; }; -static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, - struct unity_map_entry *e); -static struct dma_ops_domain *find_protection_domain(u16 devid); -static u64 *alloc_pte(struct protection_domain *domain, - unsigned long address, int end_lvl, - u64 **pte_page, gfp_t gfp); -static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, - unsigned long start_page, - unsigned int pages); static void reset_iommu_command_buffer(struct amd_iommu *iommu); -static u64 *fetch_pte(struct protection_domain *domain, - unsigned long address, int map_size); static void update_domain(struct protection_domain *domain); +/**************************************************************************** + * + * Helper functions + * + ****************************************************************************/ + +static inline u16 get_device_id(struct device *dev) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return calc_devid(pdev->bus->number, pdev->devfn); +} + +static struct iommu_dev_data *get_dev_data(struct device *dev) +{ + return dev->archdata.iommu; +} + +/* + * In this function the list of preallocated protection domains is traversed to + * find the domain for a specific device + */ +static struct dma_ops_domain *find_protection_domain(u16 devid) +{ + struct dma_ops_domain *entry, *ret = NULL; + unsigned long flags; + u16 alias = amd_iommu_alias_table[devid]; + + if (list_empty(&iommu_pd_list)) + return NULL; + + spin_lock_irqsave(&iommu_pd_list_lock, flags); + + list_for_each_entry(entry, &iommu_pd_list, list) { + if (entry->target_dev == devid || + entry->target_dev == alias) { + ret = entry; + break; + } + } + + spin_unlock_irqrestore(&iommu_pd_list_lock, flags); + + return ret; +} + +/* + * This function checks if the driver got a valid device from the caller to + * avoid dereferencing invalid pointers. + */ +static bool check_device(struct device *dev) +{ + u16 devid; + + if (!dev || !dev->dma_mask) + return false; + + /* No device or no PCI device */ + if (!dev || dev->bus != &pci_bus_type) + return false; + + devid = get_device_id(dev); + + /* Out of our scope? */ + if (devid > amd_iommu_last_bdf) + return false; + + if (amd_iommu_rlookup_table[devid] == NULL) + return false; + + return true; +} + +static int iommu_init_device(struct device *dev) +{ + struct iommu_dev_data *dev_data; + struct pci_dev *pdev; + u16 devid, alias; + + if (dev->archdata.iommu) + return 0; + + dev_data = kzalloc(sizeof(*dev_data), GFP_KERNEL); + if (!dev_data) + return -ENOMEM; + + dev_data->dev = dev; + + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + pdev = pci_get_bus_and_slot(PCI_BUS(alias), alias & 0xff); + if (pdev) + dev_data->alias = &pdev->dev; + + atomic_set(&dev_data->bind, 0); + + dev->archdata.iommu = dev_data; + + + return 0; +} + +static void iommu_uninit_device(struct device *dev) +{ + kfree(dev->archdata.iommu); +} + +void __init amd_iommu_uninit_devices(void) +{ + struct pci_dev *pdev = NULL; + + for_each_pci_dev(pdev) { + + if (!check_device(&pdev->dev)) + continue; + + iommu_uninit_device(&pdev->dev); + } +} + +int __init amd_iommu_init_devices(void) +{ + struct pci_dev *pdev = NULL; + int ret = 0; + + for_each_pci_dev(pdev) { + + if (!check_device(&pdev->dev)) + continue; + + ret = iommu_init_device(&pdev->dev); + if (ret) + goto out_free; + } + + return 0; + +out_free: + + amd_iommu_uninit_devices(); + + return ret; +} #ifdef CONFIG_AMD_IOMMU_STATS /* @@ -90,7 +223,6 @@ DECLARE_STATS_COUNTER(alloced_io_mem); DECLARE_STATS_COUNTER(total_map_requests); static struct dentry *stats_dir; -static struct dentry *de_isolate; static struct dentry *de_fflush; static void amd_iommu_stats_add(struct __iommu_counter *cnt) @@ -108,9 +240,6 @@ static void amd_iommu_stats_init(void) if (stats_dir == NULL) return; - de_isolate = debugfs_create_bool("isolation", 0444, stats_dir, - (u32 *)&amd_iommu_isolate); - de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir, (u32 *)&amd_iommu_unmap_flush); @@ -130,12 +259,6 @@ static void amd_iommu_stats_init(void) #endif -/* returns !0 if the IOMMU is caching non-present entries in its TLB */ -static int iommu_has_npcache(struct amd_iommu *iommu) -{ - return iommu->cap & (1UL << IOMMU_CAP_NPCACHE); -} - /**************************************************************************** * * Interrupt handling functions @@ -199,6 +322,7 @@ static void iommu_print_event(struct amd_iommu *iommu, void *__evt) break; case EVENT_TYPE_ILL_CMD: printk("ILLEGAL_COMMAND_ERROR address=0x%016llx]\n", address); + iommu->reset_in_progress = true; reset_iommu_command_buffer(iommu); dump_command(address); break; @@ -321,11 +445,8 @@ static void __iommu_wait_for_completion(struct amd_iommu *iommu) status &= ~MMIO_STATUS_COM_WAIT_INT_MASK; writel(status, iommu->mmio_base + MMIO_STATUS_OFFSET); - if (unlikely(i == EXIT_LOOP_COUNT)) { - spin_unlock(&iommu->lock); - reset_iommu_command_buffer(iommu); - spin_lock(&iommu->lock); - } + if (unlikely(i == EXIT_LOOP_COUNT)) + iommu->reset_in_progress = true; } /* @@ -372,26 +493,46 @@ static int iommu_completion_wait(struct amd_iommu *iommu) out: spin_unlock_irqrestore(&iommu->lock, flags); + if (iommu->reset_in_progress) + reset_iommu_command_buffer(iommu); + return 0; } +static void iommu_flush_complete(struct protection_domain *domain) +{ + int i; + + for (i = 0; i < amd_iommus_present; ++i) { + if (!domain->dev_iommu[i]) + continue; + + /* + * Devices of this domain are behind this IOMMU + * We need to wait for completion of all commands. + */ + iommu_completion_wait(amd_iommus[i]); + } +} + /* * Command send function for invalidating a device table entry */ -static int iommu_queue_inv_dev_entry(struct amd_iommu *iommu, u16 devid) +static int iommu_flush_device(struct device *dev) { + struct amd_iommu *iommu; struct iommu_cmd cmd; - int ret; + u16 devid; - BUG_ON(iommu == NULL); + devid = get_device_id(dev); + iommu = amd_iommu_rlookup_table[devid]; + /* Build command */ memset(&cmd, 0, sizeof(cmd)); CMD_SET_TYPE(&cmd, CMD_INV_DEV_ENTRY); cmd.data[0] = devid; - ret = iommu_queue_command(iommu, &cmd); - - return ret; + return iommu_queue_command(iommu, &cmd); } static void __iommu_build_inv_iommu_pages(struct iommu_cmd *cmd, u64 address, @@ -430,11 +571,11 @@ static int iommu_queue_inv_iommu_pages(struct amd_iommu *iommu, * It invalidates a single PTE if the range to flush is within a single * page. Otherwise it flushes the whole TLB of the IOMMU. */ -static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid, - u64 address, size_t size) +static void __iommu_flush_pages(struct protection_domain *domain, + u64 address, size_t size, int pde) { - int s = 0; - unsigned pages = iommu_num_pages(address, size, PAGE_SIZE); + int s = 0, i; + unsigned long pages = iommu_num_pages(address, size, PAGE_SIZE); address &= PAGE_MASK; @@ -447,142 +588,212 @@ static int iommu_flush_pages(struct amd_iommu *iommu, u16 domid, s = 1; } - iommu_queue_inv_iommu_pages(iommu, address, domid, 0, s); - return 0; + for (i = 0; i < amd_iommus_present; ++i) { + if (!domain->dev_iommu[i]) + continue; + + /* + * Devices of this domain are behind this IOMMU + * We need a TLB flush + */ + iommu_queue_inv_iommu_pages(amd_iommus[i], address, + domain->id, pde, s); + } + + return; } -/* Flush the whole IO/TLB for a given protection domain */ -static void iommu_flush_tlb(struct amd_iommu *iommu, u16 domid) +static void iommu_flush_pages(struct protection_domain *domain, + u64 address, size_t size) { - u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; - - INC_STATS_COUNTER(domain_flush_single); + __iommu_flush_pages(domain, address, size, 0); +} - iommu_queue_inv_iommu_pages(iommu, address, domid, 0, 1); +/* Flush the whole IO/TLB for a given protection domain */ +static void iommu_flush_tlb(struct protection_domain *domain) +{ + __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 0); } /* Flush the whole IO/TLB for a given protection domain - including PDE */ -static void iommu_flush_tlb_pde(struct amd_iommu *iommu, u16 domid) +static void iommu_flush_tlb_pde(struct protection_domain *domain) { - u64 address = CMD_INV_IOMMU_ALL_PAGES_ADDRESS; - - INC_STATS_COUNTER(domain_flush_single); - - iommu_queue_inv_iommu_pages(iommu, address, domid, 1, 1); + __iommu_flush_pages(domain, 0, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, 1); } + /* - * This function flushes one domain on one IOMMU + * This function flushes the DTEs for all devices in domain */ -static void flush_domain_on_iommu(struct amd_iommu *iommu, u16 domid) +static void iommu_flush_domain_devices(struct protection_domain *domain) { - struct iommu_cmd cmd; + struct iommu_dev_data *dev_data; unsigned long flags; - __iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS, - domid, 1, 1); + spin_lock_irqsave(&domain->lock, flags); - spin_lock_irqsave(&iommu->lock, flags); - __iommu_queue_command(iommu, &cmd); - __iommu_completion_wait(iommu); - __iommu_wait_for_completion(iommu); - spin_unlock_irqrestore(&iommu->lock, flags); + list_for_each_entry(dev_data, &domain->dev_list, list) + iommu_flush_device(dev_data->dev); + + spin_unlock_irqrestore(&domain->lock, flags); } -static void flush_all_domains_on_iommu(struct amd_iommu *iommu) +static void iommu_flush_all_domain_devices(void) { - int i; + struct protection_domain *domain; + unsigned long flags; - for (i = 1; i < MAX_DOMAIN_ID; ++i) { - if (!test_bit(i, amd_iommu_pd_alloc_bitmap)) - continue; - flush_domain_on_iommu(iommu, i); + spin_lock_irqsave(&amd_iommu_pd_lock, flags); + + list_for_each_entry(domain, &amd_iommu_pd_list, list) { + iommu_flush_domain_devices(domain); + iommu_flush_complete(domain); } + spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); +} + +void amd_iommu_flush_all_devices(void) +{ + iommu_flush_all_domain_devices(); } /* - * This function is used to flush the IO/TLB for a given protection domain - * on every IOMMU in the system + * This function uses heavy locking and may disable irqs for some time. But + * this is no issue because it is only called during resume. */ -static void iommu_flush_domain(u16 domid) +void amd_iommu_flush_all_domains(void) { - struct amd_iommu *iommu; + struct protection_domain *domain; + unsigned long flags; - INC_STATS_COUNTER(domain_flush_all); + spin_lock_irqsave(&amd_iommu_pd_lock, flags); - for_each_iommu(iommu) - flush_domain_on_iommu(iommu, domid); + list_for_each_entry(domain, &amd_iommu_pd_list, list) { + spin_lock(&domain->lock); + iommu_flush_tlb_pde(domain); + iommu_flush_complete(domain); + spin_unlock(&domain->lock); + } + + spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); } -void amd_iommu_flush_all_domains(void) +static void reset_iommu_command_buffer(struct amd_iommu *iommu) { - struct amd_iommu *iommu; + pr_err("AMD-Vi: Resetting IOMMU command buffer\n"); - for_each_iommu(iommu) - flush_all_domains_on_iommu(iommu); + if (iommu->reset_in_progress) + panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n"); + + amd_iommu_reset_cmd_buffer(iommu); + amd_iommu_flush_all_devices(); + amd_iommu_flush_all_domains(); + + iommu->reset_in_progress = false; } -static void flush_all_devices_for_iommu(struct amd_iommu *iommu) +/**************************************************************************** + * + * The functions below are used the create the page table mappings for + * unity mapped regions. + * + ****************************************************************************/ + +/* + * This function is used to add another level to an IO page table. Adding + * another level increases the size of the address space by 9 bits to a size up + * to 64 bits. + */ +static bool increase_address_space(struct protection_domain *domain, + gfp_t gfp) { - int i; + u64 *pte; - for (i = 0; i <= amd_iommu_last_bdf; ++i) { - if (iommu != amd_iommu_rlookup_table[i]) - continue; + if (domain->mode == PAGE_MODE_6_LEVEL) + /* address space already 64 bit large */ + return false; - iommu_queue_inv_dev_entry(iommu, i); - iommu_completion_wait(iommu); - } + pte = (void *)get_zeroed_page(gfp); + if (!pte) + return false; + + *pte = PM_LEVEL_PDE(domain->mode, + virt_to_phys(domain->pt_root)); + domain->pt_root = pte; + domain->mode += 1; + domain->updated = true; + + return true; } -static void flush_devices_by_domain(struct protection_domain *domain) +static u64 *alloc_pte(struct protection_domain *domain, + unsigned long address, + int end_lvl, + u64 **pte_page, + gfp_t gfp) { - struct amd_iommu *iommu; - int i; + u64 *pte, *page; + int level; - for (i = 0; i <= amd_iommu_last_bdf; ++i) { - if ((domain == NULL && amd_iommu_pd_table[i] == NULL) || - (amd_iommu_pd_table[i] != domain)) - continue; + while (address > PM_LEVEL_SIZE(domain->mode)) + increase_address_space(domain, gfp); - iommu = amd_iommu_rlookup_table[i]; - if (!iommu) - continue; + level = domain->mode - 1; + pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; - iommu_queue_inv_dev_entry(iommu, i); - iommu_completion_wait(iommu); + while (level > end_lvl) { + if (!IOMMU_PTE_PRESENT(*pte)) { + page = (u64 *)get_zeroed_page(gfp); + if (!page) + return NULL; + *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); + } + + level -= 1; + + pte = IOMMU_PTE_PAGE(*pte); + + if (pte_page && level == end_lvl) + *pte_page = pte; + + pte = &pte[PM_LEVEL_INDEX(level, address)]; } + + return pte; } -static void reset_iommu_command_buffer(struct amd_iommu *iommu) +/* + * This function checks if there is a PTE for a given dma address. If + * there is one, it returns the pointer to it. + */ +static u64 *fetch_pte(struct protection_domain *domain, + unsigned long address, int map_size) { - pr_err("AMD-Vi: Resetting IOMMU command buffer\n"); + int level; + u64 *pte; - if (iommu->reset_in_progress) - panic("AMD-Vi: ILLEGAL_COMMAND_ERROR while resetting command buffer\n"); + level = domain->mode - 1; + pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; - iommu->reset_in_progress = true; + while (level > map_size) { + if (!IOMMU_PTE_PRESENT(*pte)) + return NULL; - amd_iommu_reset_cmd_buffer(iommu); - flush_all_devices_for_iommu(iommu); - flush_all_domains_on_iommu(iommu); + level -= 1; - iommu->reset_in_progress = false; -} + pte = IOMMU_PTE_PAGE(*pte); + pte = &pte[PM_LEVEL_INDEX(level, address)]; -void amd_iommu_flush_all_devices(void) -{ - flush_devices_by_domain(NULL); -} + if ((PM_PTE_LEVEL(*pte) == 0) && level != map_size) { + pte = NULL; + break; + } + } -/**************************************************************************** - * - * The functions below are used the create the page table mappings for - * unity mapped regions. - * - ****************************************************************************/ + return pte; +} /* * Generic mapping functions. It maps a physical address into a DMA @@ -654,28 +865,6 @@ static int iommu_for_unity_map(struct amd_iommu *iommu, } /* - * Init the unity mappings for a specific IOMMU in the system - * - * Basically iterates over all unity mapping entries and applies them to - * the default domain DMA of that IOMMU if necessary. - */ -static int iommu_init_unity_mappings(struct amd_iommu *iommu) -{ - struct unity_map_entry *entry; - int ret; - - list_for_each_entry(entry, &amd_iommu_unity_map, list) { - if (!iommu_for_unity_map(iommu, entry)) - continue; - ret = dma_ops_unity_map(iommu->default_dom, entry); - if (ret) - return ret; - } - - return 0; -} - -/* * This function actually applies the mapping to the page table of the * dma_ops domain. */ @@ -704,6 +893,28 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom, } /* + * Init the unity mappings for a specific IOMMU in the system + * + * Basically iterates over all unity mapping entries and applies them to + * the default domain DMA of that IOMMU if necessary. + */ +static int iommu_init_unity_mappings(struct amd_iommu *iommu) +{ + struct unity_map_entry *entry; + int ret; + + list_for_each_entry(entry, &amd_iommu_unity_map, list) { + if (!iommu_for_unity_map(iommu, entry)) + continue; + ret = dma_ops_unity_map(iommu->default_dom, entry); + if (ret) + return ret; + } + + return 0; +} + +/* * Inits the unity mappings required for a specific device */ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, @@ -740,34 +951,23 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom, */ /* - * This function checks if there is a PTE for a given dma address. If - * there is one, it returns the pointer to it. + * Used to reserve address ranges in the aperture (e.g. for exclusion + * ranges. */ -static u64 *fetch_pte(struct protection_domain *domain, - unsigned long address, int map_size) +static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, + unsigned long start_page, + unsigned int pages) { - int level; - u64 *pte; - - level = domain->mode - 1; - pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; - - while (level > map_size) { - if (!IOMMU_PTE_PRESENT(*pte)) - return NULL; - - level -= 1; + unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; - pte = IOMMU_PTE_PAGE(*pte); - pte = &pte[PM_LEVEL_INDEX(level, address)]; + if (start_page + pages > last_page) + pages = last_page - start_page; - if ((PM_PTE_LEVEL(*pte) == 0) && level != map_size) { - pte = NULL; - break; - } + for (i = start_page; i < start_page + pages; ++i) { + int index = i / APERTURE_RANGE_PAGES; + int page = i % APERTURE_RANGE_PAGES; + __set_bit(page, dom->aperture[index]->bitmap); } - - return pte; } /* @@ -775,11 +975,11 @@ static u64 *fetch_pte(struct protection_domain *domain, * aperture in case of dma_ops domain allocation or address allocation * failure. */ -static int alloc_new_range(struct amd_iommu *iommu, - struct dma_ops_domain *dma_dom, +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; + struct amd_iommu *iommu; int i; #ifdef CONFIG_IOMMU_STRESS @@ -819,14 +1019,17 @@ static int alloc_new_range(struct amd_iommu *iommu, dma_dom->aperture_size += APERTURE_RANGE_SIZE; /* Intialize the exclusion range if necessary */ - if (iommu->exclusion_start && - iommu->exclusion_start >= dma_dom->aperture[index]->offset && - iommu->exclusion_start < dma_dom->aperture_size) { - unsigned long startpage = iommu->exclusion_start >> PAGE_SHIFT; - int pages = iommu_num_pages(iommu->exclusion_start, - iommu->exclusion_length, - PAGE_SIZE); - dma_ops_reserve_addresses(dma_dom, startpage, pages); + for_each_iommu(iommu) { + if (iommu->exclusion_start && + iommu->exclusion_start >= dma_dom->aperture[index]->offset + && iommu->exclusion_start < dma_dom->aperture_size) { + unsigned long startpage; + int pages = iommu_num_pages(iommu->exclusion_start, + iommu->exclusion_length, + PAGE_SIZE); + startpage = iommu->exclusion_start >> PAGE_SHIFT; + dma_ops_reserve_addresses(dma_dom, startpage, pages); + } } /* @@ -928,7 +1131,7 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev, } if (unlikely(address == -1)) - address = bad_dma_address; + address = DMA_ERROR_CODE; WARN_ON((address + (PAGE_SIZE*pages)) > dom->aperture_size); @@ -973,6 +1176,31 @@ static void dma_ops_free_addresses(struct dma_ops_domain *dom, * ****************************************************************************/ +/* + * This function adds a protection domain to the global protection domain list + */ +static void add_domain_to_list(struct protection_domain *domain) +{ + unsigned long flags; + + spin_lock_irqsave(&amd_iommu_pd_lock, flags); + list_add(&domain->list, &amd_iommu_pd_list); + spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); +} + +/* + * This function removes a protection domain to the global + * protection domain list + */ +static void del_domain_from_list(struct protection_domain *domain) +{ + unsigned long flags; + + spin_lock_irqsave(&amd_iommu_pd_lock, flags); + list_del(&domain->list); + spin_unlock_irqrestore(&amd_iommu_pd_lock, flags); +} + static u16 domain_id_alloc(void) { unsigned long flags; @@ -1000,26 +1228,6 @@ static void domain_id_free(int id) write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); } -/* - * Used to reserve address ranges in the aperture (e.g. for exclusion - * ranges. - */ -static void dma_ops_reserve_addresses(struct dma_ops_domain *dom, - unsigned long start_page, - unsigned int pages) -{ - unsigned int i, last_page = dom->aperture_size >> PAGE_SHIFT; - - if (start_page + pages > last_page) - pages = last_page - start_page; - - for (i = start_page; i < start_page + pages; ++i) { - int index = i / APERTURE_RANGE_PAGES; - int page = i % APERTURE_RANGE_PAGES; - __set_bit(page, dom->aperture[index]->bitmap); - } -} - static void free_pagetable(struct protection_domain *domain) { int i, j; @@ -1061,6 +1269,8 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom) if (!dom) return; + del_domain_from_list(&dom->domain); + free_pagetable(&dom->domain); for (i = 0; i < APERTURE_MAX_RANGES; ++i) { @@ -1078,7 +1288,7 @@ static void dma_ops_domain_free(struct dma_ops_domain *dom) * It also intializes the page table and the address allocator data * structures required for the dma_ops interface */ -static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu) +static struct dma_ops_domain *dma_ops_domain_alloc(void) { struct dma_ops_domain *dma_dom; @@ -1091,6 +1301,7 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu) dma_dom->domain.id = domain_id_alloc(); if (dma_dom->domain.id == 0) goto free_dma_dom; + INIT_LIST_HEAD(&dma_dom->domain.dev_list); dma_dom->domain.mode = PAGE_MODE_2_LEVEL; dma_dom->domain.pt_root = (void *)get_zeroed_page(GFP_KERNEL); dma_dom->domain.flags = PD_DMA_OPS_MASK; @@ -1101,7 +1312,9 @@ static struct dma_ops_domain *dma_ops_domain_alloc(struct amd_iommu *iommu) dma_dom->need_flush = false; dma_dom->target_dev = 0xffff; - if (alloc_new_range(iommu, dma_dom, true, GFP_KERNEL)) + add_domain_to_list(&dma_dom->domain); + + if (alloc_new_range(dma_dom, true, GFP_KERNEL)) goto free_dma_dom; /* @@ -1129,22 +1342,6 @@ static bool dma_ops_domain(struct protection_domain *domain) return domain->flags & PD_DMA_OPS_MASK; } -/* - * Find out the protection domain structure for a given PCI device. This - * will give us the pointer to the page table root for example. - */ -static struct protection_domain *domain_for_device(u16 devid) -{ - struct protection_domain *dom; - unsigned long flags; - - read_lock_irqsave(&amd_iommu_devtable_lock, flags); - dom = amd_iommu_pd_table[devid]; - read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); - - return dom; -} - static void set_dte_entry(u16 devid, struct protection_domain *domain) { u64 pte_root = virt_to_phys(domain->pt_root); @@ -1156,42 +1353,123 @@ static void set_dte_entry(u16 devid, struct protection_domain *domain) amd_iommu_dev_table[devid].data[2] = domain->id; amd_iommu_dev_table[devid].data[1] = upper_32_bits(pte_root); amd_iommu_dev_table[devid].data[0] = lower_32_bits(pte_root); +} - amd_iommu_pd_table[devid] = domain; +static void clear_dte_entry(u16 devid) +{ + /* remove entry from the device table seen by the hardware */ + amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; + amd_iommu_dev_table[devid].data[1] = 0; + amd_iommu_dev_table[devid].data[2] = 0; + + amd_iommu_apply_erratum_63(devid); +} + +static void do_attach(struct device *dev, struct protection_domain *domain) +{ + struct iommu_dev_data *dev_data; + struct amd_iommu *iommu; + u16 devid; + + devid = get_device_id(dev); + iommu = amd_iommu_rlookup_table[devid]; + dev_data = get_dev_data(dev); + + /* Update data structures */ + dev_data->domain = domain; + list_add(&dev_data->list, &domain->dev_list); + set_dte_entry(devid, domain); + + /* Do reference counting */ + domain->dev_iommu[iommu->index] += 1; + domain->dev_cnt += 1; + + /* Flush the DTE entry */ + iommu_flush_device(dev); +} + +static void do_detach(struct device *dev) +{ + struct iommu_dev_data *dev_data; + struct amd_iommu *iommu; + u16 devid; + + devid = get_device_id(dev); + iommu = amd_iommu_rlookup_table[devid]; + dev_data = get_dev_data(dev); + + /* decrease reference counters */ + dev_data->domain->dev_iommu[iommu->index] -= 1; + dev_data->domain->dev_cnt -= 1; + + /* Update data structures */ + dev_data->domain = NULL; + list_del(&dev_data->list); + clear_dte_entry(devid); + + /* Flush the DTE entry */ + iommu_flush_device(dev); } /* * If a device is not yet associated with a domain, this function does * assigns it visible for the hardware */ -static void __attach_device(struct amd_iommu *iommu, - struct protection_domain *domain, - u16 devid) +static int __attach_device(struct device *dev, + struct protection_domain *domain) { + struct iommu_dev_data *dev_data, *alias_data; + + dev_data = get_dev_data(dev); + alias_data = get_dev_data(dev_data->alias); + + if (!alias_data) + return -EINVAL; + /* lock domain */ spin_lock(&domain->lock); - /* update DTE entry */ - set_dte_entry(devid, domain); + /* Some sanity checks */ + if (alias_data->domain != NULL && + alias_data->domain != domain) + return -EBUSY; + + if (dev_data->domain != NULL && + dev_data->domain != domain) + return -EBUSY; + + /* Do real assignment */ + if (dev_data->alias != dev) { + alias_data = get_dev_data(dev_data->alias); + if (alias_data->domain == NULL) + do_attach(dev_data->alias, domain); - domain->dev_cnt += 1; + atomic_inc(&alias_data->bind); + } + + if (dev_data->domain == NULL) + do_attach(dev, domain); + + atomic_inc(&dev_data->bind); /* ready */ spin_unlock(&domain->lock); + + return 0; } /* * If a device is not yet associated with a domain, this function does * assigns it visible for the hardware */ -static void attach_device(struct amd_iommu *iommu, - struct protection_domain *domain, - u16 devid) +static int attach_device(struct device *dev, + struct protection_domain *domain) { unsigned long flags; + int ret; write_lock_irqsave(&amd_iommu_devtable_lock, flags); - __attach_device(iommu, domain, devid); + ret = __attach_device(dev, domain); write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); /* @@ -1199,98 +1477,125 @@ static void attach_device(struct amd_iommu *iommu, * left the caches in the IOMMU dirty. So we have to flush * here to evict all dirty stuff. */ - iommu_queue_inv_dev_entry(iommu, devid); - iommu_flush_tlb_pde(iommu, domain->id); + iommu_flush_tlb_pde(domain); + + return ret; } /* * Removes a device from a protection domain (unlocked) */ -static void __detach_device(struct protection_domain *domain, u16 devid) +static void __detach_device(struct device *dev) { + struct iommu_dev_data *dev_data = get_dev_data(dev); + struct iommu_dev_data *alias_data; + unsigned long flags; - /* lock domain */ - spin_lock(&domain->lock); + BUG_ON(!dev_data->domain); - /* remove domain from the lookup table */ - amd_iommu_pd_table[devid] = NULL; + spin_lock_irqsave(&dev_data->domain->lock, flags); - /* remove entry from the device table seen by the hardware */ - amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; - amd_iommu_dev_table[devid].data[1] = 0; - amd_iommu_dev_table[devid].data[2] = 0; - - amd_iommu_apply_erratum_63(devid); + if (dev_data->alias != dev) { + alias_data = get_dev_data(dev_data->alias); + if (atomic_dec_and_test(&alias_data->bind)) + do_detach(dev_data->alias); + } - /* decrease reference counter */ - domain->dev_cnt -= 1; + if (atomic_dec_and_test(&dev_data->bind)) + do_detach(dev); - /* ready */ - spin_unlock(&domain->lock); + spin_unlock_irqrestore(&dev_data->domain->lock, flags); /* * If we run in passthrough mode the device must be assigned to the * passthrough domain if it is detached from any other domain */ - if (iommu_pass_through) { - struct amd_iommu *iommu = amd_iommu_rlookup_table[devid]; - __attach_device(iommu, pt_domain, devid); - } + if (iommu_pass_through && dev_data->domain == NULL) + __attach_device(dev, pt_domain); } /* * Removes a device from a protection domain (with devtable_lock held) */ -static void detach_device(struct protection_domain *domain, u16 devid) +static void detach_device(struct device *dev) { unsigned long flags; /* lock device table */ write_lock_irqsave(&amd_iommu_devtable_lock, flags); - __detach_device(domain, devid); + __detach_device(dev); write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); } +/* + * Find out the protection domain structure for a given PCI device. This + * will give us the pointer to the page table root for example. + */ +static struct protection_domain *domain_for_device(struct device *dev) +{ + struct protection_domain *dom; + struct iommu_dev_data *dev_data, *alias_data; + unsigned long flags; + u16 devid, alias; + + devid = get_device_id(dev); + alias = amd_iommu_alias_table[devid]; + dev_data = get_dev_data(dev); + alias_data = get_dev_data(dev_data->alias); + if (!alias_data) + return NULL; + + read_lock_irqsave(&amd_iommu_devtable_lock, flags); + dom = dev_data->domain; + if (dom == NULL && + alias_data->domain != NULL) { + __attach_device(dev, alias_data->domain); + dom = alias_data->domain; + } + + read_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + + return dom; +} + static int device_change_notifier(struct notifier_block *nb, unsigned long action, void *data) { struct device *dev = data; - struct pci_dev *pdev = to_pci_dev(dev); - u16 devid = calc_devid(pdev->bus->number, pdev->devfn); + u16 devid; struct protection_domain *domain; struct dma_ops_domain *dma_domain; struct amd_iommu *iommu; unsigned long flags; - if (devid > amd_iommu_last_bdf) - goto out; - - devid = amd_iommu_alias_table[devid]; - - iommu = amd_iommu_rlookup_table[devid]; - if (iommu == NULL) - goto out; - - domain = domain_for_device(devid); + if (!check_device(dev)) + return 0; - if (domain && !dma_ops_domain(domain)) - WARN_ONCE(1, "AMD IOMMU WARNING: device %s already bound " - "to a non-dma-ops domain\n", dev_name(dev)); + devid = get_device_id(dev); + iommu = amd_iommu_rlookup_table[devid]; switch (action) { case BUS_NOTIFY_UNBOUND_DRIVER: + + domain = domain_for_device(dev); + if (!domain) goto out; if (iommu_pass_through) break; - detach_device(domain, devid); + detach_device(dev); break; case BUS_NOTIFY_ADD_DEVICE: + + iommu_init_device(dev); + + domain = domain_for_device(dev); + /* allocate a protection domain if a device is added */ dma_domain = find_protection_domain(devid); if (dma_domain) goto out; - dma_domain = dma_ops_domain_alloc(iommu); + dma_domain = dma_ops_domain_alloc(); if (!dma_domain) goto out; dma_domain->target_dev = devid; @@ -1300,11 +1605,15 @@ static int device_change_notifier(struct notifier_block *nb, spin_unlock_irqrestore(&iommu_pd_list_lock, flags); break; + case BUS_NOTIFY_DEL_DEVICE: + + iommu_uninit_device(dev); + default: goto out; } - iommu_queue_inv_dev_entry(iommu, devid); + iommu_flush_device(dev); iommu_completion_wait(iommu); out: @@ -1315,6 +1624,11 @@ static struct notifier_block device_nb = { .notifier_call = device_change_notifier, }; +void amd_iommu_init_notifier(void) +{ + bus_register_notifier(&pci_bus_type, &device_nb); +} + /***************************************************************************** * * The next functions belong to the dma_ops mapping/unmapping code. @@ -1322,106 +1636,46 @@ static struct notifier_block device_nb = { *****************************************************************************/ /* - * This function checks if the driver got a valid device from the caller to - * avoid dereferencing invalid pointers. - */ -static bool check_device(struct device *dev) -{ - if (!dev || !dev->dma_mask) - return false; - - return true; -} - -/* - * In this function the list of preallocated protection domains is traversed to - * find the domain for a specific device - */ -static struct dma_ops_domain *find_protection_domain(u16 devid) -{ - struct dma_ops_domain *entry, *ret = NULL; - unsigned long flags; - - if (list_empty(&iommu_pd_list)) - return NULL; - - spin_lock_irqsave(&iommu_pd_list_lock, flags); - - list_for_each_entry(entry, &iommu_pd_list, list) { - if (entry->target_dev == devid) { - ret = entry; - break; - } - } - - spin_unlock_irqrestore(&iommu_pd_list_lock, flags); - - return ret; -} - -/* * In the dma_ops path we only have the struct device. This function * finds the corresponding IOMMU, the protection domain and the * requestor id for a given device. * If the device is not yet associated with a domain this is also done * in this function. */ -static int get_device_resources(struct device *dev, - struct amd_iommu **iommu, - struct protection_domain **domain, - u16 *bdf) +static struct protection_domain *get_domain(struct device *dev) { + struct protection_domain *domain; struct dma_ops_domain *dma_dom; - struct pci_dev *pcidev; - u16 _bdf; - - *iommu = NULL; - *domain = NULL; - *bdf = 0xffff; - - if (dev->bus != &pci_bus_type) - return 0; + u16 devid = get_device_id(dev); - pcidev = to_pci_dev(dev); - _bdf = calc_devid(pcidev->bus->number, pcidev->devfn); + if (!check_device(dev)) + return ERR_PTR(-EINVAL); - /* device not translated by any IOMMU in the system? */ - if (_bdf > amd_iommu_last_bdf) - return 0; + domain = domain_for_device(dev); + if (domain != NULL && !dma_ops_domain(domain)) + return ERR_PTR(-EBUSY); - *bdf = amd_iommu_alias_table[_bdf]; + if (domain != NULL) + return domain; - *iommu = amd_iommu_rlookup_table[*bdf]; - if (*iommu == NULL) - return 0; - *domain = domain_for_device(*bdf); - if (*domain == NULL) { - dma_dom = find_protection_domain(*bdf); - if (!dma_dom) - dma_dom = (*iommu)->default_dom; - *domain = &dma_dom->domain; - attach_device(*iommu, *domain, *bdf); - DUMP_printk("Using protection domain %d for device %s\n", - (*domain)->id, dev_name(dev)); - } - - if (domain_for_device(_bdf) == NULL) - attach_device(*iommu, *domain, _bdf); + /* Device not bount yet - bind it */ + dma_dom = find_protection_domain(devid); + if (!dma_dom) + dma_dom = amd_iommu_rlookup_table[devid]->default_dom; + attach_device(dev, &dma_dom->domain); + DUMP_printk("Using protection domain %d for device %s\n", + dma_dom->domain.id, dev_name(dev)); - return 1; + return &dma_dom->domain; } static void update_device_table(struct protection_domain *domain) { - unsigned long flags; - int i; + struct iommu_dev_data *dev_data; - for (i = 0; i <= amd_iommu_last_bdf; ++i) { - if (amd_iommu_pd_table[i] != domain) - continue; - write_lock_irqsave(&amd_iommu_devtable_lock, flags); - set_dte_entry(i, domain); - write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); + list_for_each_entry(dev_data, &domain->dev_list, list) { + u16 devid = get_device_id(dev_data->dev); + set_dte_entry(devid, domain); } } @@ -1431,76 +1685,13 @@ static void update_domain(struct protection_domain *domain) return; update_device_table(domain); - flush_devices_by_domain(domain); - iommu_flush_domain(domain->id); + iommu_flush_domain_devices(domain); + iommu_flush_tlb_pde(domain); domain->updated = false; } /* - * This function is used to add another level to an IO page table. Adding - * another level increases the size of the address space by 9 bits to a size up - * to 64 bits. - */ -static bool increase_address_space(struct protection_domain *domain, - gfp_t gfp) -{ - u64 *pte; - - if (domain->mode == PAGE_MODE_6_LEVEL) - /* address space already 64 bit large */ - return false; - - pte = (void *)get_zeroed_page(gfp); - if (!pte) - return false; - - *pte = PM_LEVEL_PDE(domain->mode, - virt_to_phys(domain->pt_root)); - domain->pt_root = pte; - domain->mode += 1; - domain->updated = true; - - return true; -} - -static u64 *alloc_pte(struct protection_domain *domain, - unsigned long address, - int end_lvl, - u64 **pte_page, - gfp_t gfp) -{ - u64 *pte, *page; - int level; - - while (address > PM_LEVEL_SIZE(domain->mode)) - increase_address_space(domain, gfp); - - level = domain->mode - 1; - pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)]; - - while (level > end_lvl) { - if (!IOMMU_PTE_PRESENT(*pte)) { - page = (u64 *)get_zeroed_page(gfp); - if (!page) - return NULL; - *pte = PM_LEVEL_PDE(level, virt_to_phys(page)); - } - - level -= 1; - - pte = IOMMU_PTE_PAGE(*pte); - - if (pte_page && level == end_lvl) - *pte_page = pte; - - pte = &pte[PM_LEVEL_INDEX(level, address)]; - } - - return pte; -} - -/* * This function fetches the PTE for a given address in the aperture */ static u64* dma_ops_get_pte(struct dma_ops_domain *dom, @@ -1530,8 +1721,7 @@ static u64* dma_ops_get_pte(struct dma_ops_domain *dom, * This is the generic map function. It maps one 4kb page at paddr to * the given address in the DMA address space for the domain. */ -static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu, - struct dma_ops_domain *dom, +static dma_addr_t dma_ops_domain_map(struct dma_ops_domain *dom, unsigned long address, phys_addr_t paddr, int direction) @@ -1544,7 +1734,7 @@ static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu, pte = dma_ops_get_pte(dom, address); if (!pte) - return bad_dma_address; + return DMA_ERROR_CODE; __pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC; @@ -1565,8 +1755,7 @@ static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu, /* * The generic unmapping function for on page in the DMA address space. */ -static void dma_ops_domain_unmap(struct amd_iommu *iommu, - struct dma_ops_domain *dom, +static void dma_ops_domain_unmap(struct dma_ops_domain *dom, unsigned long address) { struct aperture_range *aperture; @@ -1597,7 +1786,6 @@ static void dma_ops_domain_unmap(struct amd_iommu *iommu, * Must be called with the domain lock held. */ static dma_addr_t __map_single(struct device *dev, - struct amd_iommu *iommu, struct dma_ops_domain *dma_dom, phys_addr_t paddr, size_t size, @@ -1625,7 +1813,7 @@ static dma_addr_t __map_single(struct device *dev, retry: address = dma_ops_alloc_addresses(dev, dma_dom, pages, align_mask, dma_mask); - if (unlikely(address == bad_dma_address)) { + if (unlikely(address == DMA_ERROR_CODE)) { /* * setting next_address here will let the address * allocator only scan the new allocated range in the @@ -1633,11 +1821,11 @@ retry: */ dma_dom->next_address = dma_dom->aperture_size; - if (alloc_new_range(iommu, dma_dom, false, GFP_ATOMIC)) + if (alloc_new_range(dma_dom, false, GFP_ATOMIC)) goto out; /* - * aperture was sucessfully enlarged by 128 MB, try + * aperture was successfully enlarged by 128 MB, try * allocation again */ goto retry; @@ -1645,8 +1833,8 @@ retry: start = address; for (i = 0; i < pages; ++i) { - ret = dma_ops_domain_map(iommu, dma_dom, start, paddr, dir); - if (ret == bad_dma_address) + ret = dma_ops_domain_map(dma_dom, start, paddr, dir); + if (ret == DMA_ERROR_CODE) goto out_unmap; paddr += PAGE_SIZE; @@ -1657,10 +1845,10 @@ retry: ADD_STATS_COUNTER(alloced_io_mem, size); if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) { - iommu_flush_tlb(iommu, dma_dom->domain.id); + iommu_flush_tlb(&dma_dom->domain); dma_dom->need_flush = false; - } else if (unlikely(iommu_has_npcache(iommu))) - iommu_flush_pages(iommu, dma_dom->domain.id, address, size); + } else if (unlikely(amd_iommu_np_cache)) + iommu_flush_pages(&dma_dom->domain, address, size); out: return address; @@ -1669,20 +1857,19 @@ out_unmap: for (--i; i >= 0; --i) { start -= PAGE_SIZE; - dma_ops_domain_unmap(iommu, dma_dom, start); + dma_ops_domain_unmap(dma_dom, start); } dma_ops_free_addresses(dma_dom, address, pages); - return bad_dma_address; + return DMA_ERROR_CODE; } /* * Does the reverse of the __map_single function. Must be called with * the domain lock held too */ -static void __unmap_single(struct amd_iommu *iommu, - struct dma_ops_domain *dma_dom, +static void __unmap_single(struct dma_ops_domain *dma_dom, dma_addr_t dma_addr, size_t size, int dir) @@ -1690,7 +1877,7 @@ static void __unmap_single(struct amd_iommu *iommu, dma_addr_t i, start; unsigned int pages; - if ((dma_addr == bad_dma_address) || + if ((dma_addr == DMA_ERROR_CODE) || (dma_addr + size > dma_dom->aperture_size)) return; @@ -1699,7 +1886,7 @@ static void __unmap_single(struct amd_iommu *iommu, start = dma_addr; for (i = 0; i < pages; ++i) { - dma_ops_domain_unmap(iommu, dma_dom, start); + dma_ops_domain_unmap(dma_dom, start); start += PAGE_SIZE; } @@ -1708,7 +1895,7 @@ static void __unmap_single(struct amd_iommu *iommu, dma_ops_free_addresses(dma_dom, dma_addr, pages); if (amd_iommu_unmap_flush || dma_dom->need_flush) { - iommu_flush_pages(iommu, dma_dom->domain.id, dma_addr, size); + iommu_flush_pages(&dma_dom->domain, dma_addr, size); dma_dom->need_flush = false; } } @@ -1722,36 +1909,29 @@ static dma_addr_t map_page(struct device *dev, struct page *page, struct dma_attrs *attrs) { unsigned long flags; - struct amd_iommu *iommu; struct protection_domain *domain; - u16 devid; dma_addr_t addr; u64 dma_mask; phys_addr_t paddr = page_to_phys(page) + offset; INC_STATS_COUNTER(cnt_map_single); - if (!check_device(dev)) - return bad_dma_address; - - dma_mask = *dev->dma_mask; - - get_device_resources(dev, &iommu, &domain, &devid); - - if (iommu == NULL || domain == NULL) - /* device not handled by any AMD IOMMU */ + domain = get_domain(dev); + if (PTR_ERR(domain) == -EINVAL) return (dma_addr_t)paddr; + else if (IS_ERR(domain)) + return DMA_ERROR_CODE; - if (!dma_ops_domain(domain)) - return bad_dma_address; + dma_mask = *dev->dma_mask; spin_lock_irqsave(&domain->lock, flags); - addr = __map_single(dev, iommu, domain->priv, paddr, size, dir, false, + + addr = __map_single(dev, domain->priv, paddr, size, dir, false, dma_mask); - if (addr == bad_dma_address) + if (addr == DMA_ERROR_CODE) goto out; - iommu_completion_wait(iommu); + iommu_flush_complete(domain); out: spin_unlock_irqrestore(&domain->lock, flags); @@ -1766,25 +1946,19 @@ static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction dir, struct dma_attrs *attrs) { unsigned long flags; - struct amd_iommu *iommu; struct protection_domain *domain; - u16 devid; INC_STATS_COUNTER(cnt_unmap_single); - if (!check_device(dev) || - !get_device_resources(dev, &iommu, &domain, &devid)) - /* device not handled by any AMD IOMMU */ - return; - - if (!dma_ops_domain(domain)) + domain = get_domain(dev); + if (IS_ERR(domain)) return; spin_lock_irqsave(&domain->lock, flags); - __unmap_single(iommu, domain->priv, dma_addr, size, dir); + __unmap_single(domain->priv, dma_addr, size, dir); - iommu_completion_wait(iommu); + iommu_flush_complete(domain); spin_unlock_irqrestore(&domain->lock, flags); } @@ -1816,9 +1990,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist, struct dma_attrs *attrs) { unsigned long flags; - struct amd_iommu *iommu; struct protection_domain *domain; - u16 devid; int i; struct scatterlist *s; phys_addr_t paddr; @@ -1827,25 +1999,20 @@ static int map_sg(struct device *dev, struct scatterlist *sglist, INC_STATS_COUNTER(cnt_map_sg); - if (!check_device(dev)) + domain = get_domain(dev); + if (PTR_ERR(domain) == -EINVAL) + return map_sg_no_iommu(dev, sglist, nelems, dir); + else if (IS_ERR(domain)) return 0; dma_mask = *dev->dma_mask; - get_device_resources(dev, &iommu, &domain, &devid); - - if (!iommu || !domain) - return map_sg_no_iommu(dev, sglist, nelems, dir); - - if (!dma_ops_domain(domain)) - return 0; - spin_lock_irqsave(&domain->lock, flags); for_each_sg(sglist, s, nelems, i) { paddr = sg_phys(s); - s->dma_address = __map_single(dev, iommu, domain->priv, + s->dma_address = __map_single(dev, domain->priv, paddr, s->length, dir, false, dma_mask); @@ -1856,7 +2023,7 @@ static int map_sg(struct device *dev, struct scatterlist *sglist, goto unmap; } - iommu_completion_wait(iommu); + iommu_flush_complete(domain); out: spin_unlock_irqrestore(&domain->lock, flags); @@ -1865,7 +2032,7 @@ out: unmap: for_each_sg(sglist, s, mapped_elems, i) { if (s->dma_address) - __unmap_single(iommu, domain->priv, s->dma_address, + __unmap_single(domain->priv, s->dma_address, s->dma_length, dir); s->dma_address = s->dma_length = 0; } @@ -1884,30 +2051,25 @@ static void unmap_sg(struct device *dev, struct scatterlist *sglist, struct dma_attrs *attrs) { unsigned long flags; - struct amd_iommu *iommu; struct protection_domain *domain; struct scatterlist *s; - u16 devid; int i; INC_STATS_COUNTER(cnt_unmap_sg); - if (!check_device(dev) || - !get_device_resources(dev, &iommu, &domain, &devid)) - return; - - if (!dma_ops_domain(domain)) + domain = get_domain(dev); + if (IS_ERR(domain)) return; spin_lock_irqsave(&domain->lock, flags); for_each_sg(sglist, s, nelems, i) { - __unmap_single(iommu, domain->priv, s->dma_address, + __unmap_single(domain->priv, s->dma_address, s->dma_length, dir); s->dma_address = s->dma_length = 0; } - iommu_completion_wait(iommu); + iommu_flush_complete(domain); spin_unlock_irqrestore(&domain->lock, flags); } @@ -1920,49 +2082,44 @@ static void *alloc_coherent(struct device *dev, size_t size, { unsigned long flags; void *virt_addr; - struct amd_iommu *iommu; struct protection_domain *domain; - u16 devid; phys_addr_t paddr; u64 dma_mask = dev->coherent_dma_mask; INC_STATS_COUNTER(cnt_alloc_coherent); - if (!check_device(dev)) + domain = get_domain(dev); + if (PTR_ERR(domain) == -EINVAL) { + virt_addr = (void *)__get_free_pages(flag, get_order(size)); + *dma_addr = __pa(virt_addr); + return virt_addr; + } else if (IS_ERR(domain)) return NULL; - if (!get_device_resources(dev, &iommu, &domain, &devid)) - flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); + dma_mask = dev->coherent_dma_mask; + flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32); + flag |= __GFP_ZERO; - flag |= __GFP_ZERO; virt_addr = (void *)__get_free_pages(flag, get_order(size)); if (!virt_addr) return NULL; paddr = virt_to_phys(virt_addr); - if (!iommu || !domain) { - *dma_addr = (dma_addr_t)paddr; - return virt_addr; - } - - if (!dma_ops_domain(domain)) - goto out_free; - if (!dma_mask) dma_mask = *dev->dma_mask; spin_lock_irqsave(&domain->lock, flags); - *dma_addr = __map_single(dev, iommu, domain->priv, paddr, + *dma_addr = __map_single(dev, domain->priv, paddr, size, DMA_BIDIRECTIONAL, true, dma_mask); - if (*dma_addr == bad_dma_address) { + if (*dma_addr == DMA_ERROR_CODE) { spin_unlock_irqrestore(&domain->lock, flags); goto out_free; } - iommu_completion_wait(iommu); + iommu_flush_complete(domain); spin_unlock_irqrestore(&domain->lock, flags); @@ -1982,28 +2139,19 @@ static void free_coherent(struct device *dev, size_t size, void *virt_addr, dma_addr_t dma_addr) { unsigned long flags; - struct amd_iommu *iommu; struct protection_domain *domain; - u16 devid; INC_STATS_COUNTER(cnt_free_coherent); - if (!check_device(dev)) - return; - - get_device_resources(dev, &iommu, &domain, &devid); - - if (!iommu || !domain) - goto free_mem; - - if (!dma_ops_domain(domain)) + domain = get_domain(dev); + if (IS_ERR(domain)) goto free_mem; spin_lock_irqsave(&domain->lock, flags); - __unmap_single(iommu, domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); + __unmap_single(domain->priv, dma_addr, size, DMA_BIDIRECTIONAL); - iommu_completion_wait(iommu); + iommu_flush_complete(domain); spin_unlock_irqrestore(&domain->lock, flags); @@ -2017,22 +2165,7 @@ free_mem: */ static int amd_iommu_dma_supported(struct device *dev, u64 mask) { - u16 bdf; - struct pci_dev *pcidev; - - /* No device or no PCI device */ - if (!dev || dev->bus != &pci_bus_type) - return 0; - - pcidev = to_pci_dev(dev); - - bdf = calc_devid(pcidev->bus->number, pcidev->devfn); - - /* Out of our scope? */ - if (bdf > amd_iommu_last_bdf) - return 0; - - return 1; + return check_device(dev); } /* @@ -2046,25 +2179,28 @@ static void prealloc_protection_domains(void) { struct pci_dev *dev = NULL; struct dma_ops_domain *dma_dom; - struct amd_iommu *iommu; u16 devid; while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { - devid = calc_devid(dev->bus->number, dev->devfn); - if (devid > amd_iommu_last_bdf) - continue; - devid = amd_iommu_alias_table[devid]; - if (domain_for_device(devid)) + + /* Do we handle this device? */ + if (!check_device(&dev->dev)) continue; - iommu = amd_iommu_rlookup_table[devid]; - if (!iommu) + + /* Is there already any domain for it? */ + if (domain_for_device(&dev->dev)) continue; - dma_dom = dma_ops_domain_alloc(iommu); + + devid = get_device_id(&dev->dev); + + dma_dom = dma_ops_domain_alloc(); if (!dma_dom) continue; init_unity_mappings_for_device(dma_dom, devid); dma_dom->target_dev = devid; + attach_device(&dev->dev, &dma_dom->domain); + list_add_tail(&dma_dom->list, &iommu_pd_list); } } @@ -2093,7 +2229,7 @@ int __init amd_iommu_init_dma_ops(void) * protection domain will be assigned to the default one. */ for_each_iommu(iommu) { - iommu->default_dom = dma_ops_domain_alloc(iommu); + iommu->default_dom = dma_ops_domain_alloc(); if (iommu->default_dom == NULL) return -ENOMEM; iommu->default_dom->domain.flags |= PD_DEFAULT_MASK; @@ -2103,15 +2239,12 @@ int __init amd_iommu_init_dma_ops(void) } /* - * If device isolation is enabled, pre-allocate the protection - * domains for each device. + * Pre-allocate the protection domains for each device. */ - if (amd_iommu_isolate) - prealloc_protection_domains(); + prealloc_protection_domains(); iommu_detected = 1; - force_iommu = 1; - bad_dma_address = 0; + swiotlb = 0; #ifdef CONFIG_GART_IOMMU gart_iommu_aperture_disabled = 1; gart_iommu_aperture = 0; @@ -2122,8 +2255,6 @@ int __init amd_iommu_init_dma_ops(void) register_iommu(&amd_iommu_ops); - bus_register_notifier(&pci_bus_type, &device_nb); - amd_iommu_stats_init(); return 0; @@ -2150,14 +2281,17 @@ free_domains: static void cleanup_domain(struct protection_domain *domain) { + struct iommu_dev_data *dev_data, *next; unsigned long flags; - u16 devid; write_lock_irqsave(&amd_iommu_devtable_lock, flags); - for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) - if (amd_iommu_pd_table[devid] == domain) - __detach_device(domain, devid); + list_for_each_entry_safe(dev_data, next, &domain->dev_list, list) { + struct device *dev = dev_data->dev; + + do_detach(dev); + atomic_set(&dev_data->bind, 0); + } write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); } @@ -2167,6 +2301,8 @@ static void protection_domain_free(struct protection_domain *domain) if (!domain) return; + del_domain_from_list(domain); + if (domain->id) domain_id_free(domain->id); @@ -2185,6 +2321,9 @@ static struct protection_domain *protection_domain_alloc(void) domain->id = domain_id_alloc(); if (!domain->id) goto out_err; + INIT_LIST_HEAD(&domain->dev_list); + + add_domain_to_list(domain); return domain; @@ -2241,26 +2380,23 @@ static void amd_iommu_domain_destroy(struct iommu_domain *dom) static void amd_iommu_detach_device(struct iommu_domain *dom, struct device *dev) { - struct protection_domain *domain = dom->priv; + struct iommu_dev_data *dev_data = dev->archdata.iommu; struct amd_iommu *iommu; - struct pci_dev *pdev; u16 devid; - if (dev->bus != &pci_bus_type) + if (!check_device(dev)) return; - pdev = to_pci_dev(dev); + devid = get_device_id(dev); - devid = calc_devid(pdev->bus->number, pdev->devfn); - - if (devid > 0) - detach_device(domain, devid); + if (dev_data->domain != NULL) + detach_device(dev); iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return; - iommu_queue_inv_dev_entry(iommu, devid); + iommu_flush_device(dev); iommu_completion_wait(iommu); } @@ -2268,35 +2404,30 @@ static int amd_iommu_attach_device(struct iommu_domain *dom, struct device *dev) { struct protection_domain *domain = dom->priv; - struct protection_domain *old_domain; + struct iommu_dev_data *dev_data; struct amd_iommu *iommu; - struct pci_dev *pdev; + int ret; u16 devid; - if (dev->bus != &pci_bus_type) + if (!check_device(dev)) return -EINVAL; - pdev = to_pci_dev(dev); - - devid = calc_devid(pdev->bus->number, pdev->devfn); + dev_data = dev->archdata.iommu; - if (devid >= amd_iommu_last_bdf || - devid != amd_iommu_alias_table[devid]) - return -EINVAL; + devid = get_device_id(dev); iommu = amd_iommu_rlookup_table[devid]; if (!iommu) return -EINVAL; - old_domain = domain_for_device(devid); - if (old_domain) - detach_device(old_domain, devid); + if (dev_data->domain) + detach_device(dev); - attach_device(iommu, domain, devid); + ret = attach_device(dev, domain); iommu_completion_wait(iommu); - return 0; + return ret; } static int amd_iommu_map_range(struct iommu_domain *dom, @@ -2342,7 +2473,7 @@ static void amd_iommu_unmap_range(struct iommu_domain *dom, iova += PAGE_SIZE; } - iommu_flush_domain(domain->id); + iommu_flush_tlb_pde(domain); } static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom, @@ -2393,10 +2524,11 @@ static struct iommu_ops amd_iommu_ops = { int __init amd_iommu_init_passthrough(void) { + struct amd_iommu *iommu; struct pci_dev *dev = NULL; - u16 devid, devid2; + u16 devid; - /* allocate passthroug domain */ + /* allocate passthrough domain */ pt_domain = protection_domain_alloc(); if (!pt_domain) return -ENOMEM; @@ -2404,20 +2536,17 @@ int __init amd_iommu_init_passthrough(void) pt_domain->mode |= PAGE_MODE_NONE; while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { - struct amd_iommu *iommu; - devid = calc_devid(dev->bus->number, dev->devfn); - if (devid > amd_iommu_last_bdf) + if (!check_device(&dev->dev)) continue; - devid2 = amd_iommu_alias_table[devid]; + devid = get_device_id(&dev->dev); - iommu = amd_iommu_rlookup_table[devid2]; + iommu = amd_iommu_rlookup_table[devid]; if (!iommu) continue; - __attach_device(iommu, pt_domain, devid); - __attach_device(iommu, pt_domain, devid2); + attach_device(&dev->dev, pt_domain); } pr_info("AMD-Vi: Initialized for Passthrough Mode\n"); |