diff options
Diffstat (limited to 'drivers/iommu/iommu.c')
| -rw-r--r-- | drivers/iommu/iommu.c | 102 |
1 files changed, 78 insertions, 24 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 63b37563db7e..edbdf5d6962c 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -32,11 +32,17 @@ #include <linux/pci.h> #include <linux/bitops.h> #include <linux/property.h> +#include <linux/fsl/mc.h> #include <trace/events/iommu.h> static struct kset *iommu_group_kset; static DEFINE_IDA(iommu_group_ida); +#ifdef CONFIG_IOMMU_DEFAULT_PASSTHROUGH +static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; +#else static unsigned int iommu_def_domain_type = IOMMU_DOMAIN_DMA; +#endif +static bool iommu_dma_strict __read_mostly = true; struct iommu_callback_data { const struct iommu_ops *ops; @@ -127,6 +133,12 @@ static int __init iommu_set_def_domain_type(char *str) } early_param("iommu.passthrough", iommu_set_def_domain_type); +static int __init iommu_dma_setup(char *str) +{ + return kstrtobool(str, &iommu_dma_strict); +} +early_param("iommu.strict", iommu_dma_setup); + static ssize_t iommu_group_attr_show(struct kobject *kobj, struct attribute *__attr, char *buf) { @@ -294,11 +306,39 @@ static ssize_t iommu_group_show_resv_regions(struct iommu_group *group, return (str - buf); } +static ssize_t iommu_group_show_type(struct iommu_group *group, + char *buf) +{ + char *type = "unknown\n"; + + if (group->default_domain) { + switch (group->default_domain->type) { + case IOMMU_DOMAIN_BLOCKED: + type = "blocked\n"; + break; + case IOMMU_DOMAIN_IDENTITY: + type = "identity\n"; + break; + case IOMMU_DOMAIN_UNMANAGED: + type = "unmanaged\n"; + break; + case IOMMU_DOMAIN_DMA: + type = "DMA"; + break; + } + } + strcpy(buf, type); + + return strlen(type); +} + static IOMMU_GROUP_ATTR(name, S_IRUGO, iommu_group_show_name, NULL); static IOMMU_GROUP_ATTR(reserved_regions, 0444, iommu_group_show_resv_regions, NULL); +static IOMMU_GROUP_ATTR(type, 0444, iommu_group_show_type, NULL); + static void iommu_group_release(struct kobject *kobj) { struct iommu_group *group = to_iommu_group(kobj); @@ -380,6 +420,10 @@ struct iommu_group *iommu_group_alloc(void) if (ret) return ERR_PTR(ret); + ret = iommu_group_create_file(group, &iommu_group_attr_type); + if (ret) + return ERR_PTR(ret); + pr_debug("Allocated group %d\n", group->id); return group; @@ -988,6 +1032,18 @@ struct iommu_group *pci_device_group(struct device *dev) return iommu_group_alloc(); } +/* Get the IOMMU group for device on fsl-mc bus */ +struct iommu_group *fsl_mc_device_group(struct device *dev) +{ + struct device *cont_dev = fsl_mc_cont_dev(dev); + struct iommu_group *group; + + group = iommu_group_get(cont_dev); + if (!group) + group = iommu_group_alloc(); + return group; +} + /** * iommu_group_get_for_dev - Find or create the IOMMU group for a device * @dev: target device @@ -1036,6 +1092,13 @@ struct iommu_group *iommu_group_get_for_dev(struct device *dev) group->default_domain = dom; if (!group->domain) group->domain = dom; + + if (dom && !iommu_dma_strict) { + int attr = 1; + iommu_domain_set_attr(dom, + DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE, + &attr); + } } ret = iommu_group_add_device(group, dev); @@ -1380,7 +1443,16 @@ struct iommu_domain *iommu_get_domain_for_dev(struct device *dev) EXPORT_SYMBOL_GPL(iommu_get_domain_for_dev); /* - * IOMMU groups are really the natrual working unit of the IOMMU, but + * For IOMMU_DOMAIN_DMA implementations which already provide their own + * guarantees that the group and its default domain are valid and correct. + */ +struct iommu_domain *iommu_get_dma_domain(struct device *dev) +{ + return dev->iommu_group->default_domain; +} + +/* + * IOMMU groups are really the natural working unit of the IOMMU, but * the IOMMU API works on domains and devices. Bridge that gap by * iterating over the devices in a group. Ideally we'd have a single * device which represents the requestor ID of the group, but we also @@ -1637,8 +1709,8 @@ size_t iommu_unmap_fast(struct iommu_domain *domain, } EXPORT_SYMBOL_GPL(iommu_unmap_fast); -size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long iova, - struct scatterlist *sg, unsigned int nents, int prot) +size_t iommu_map_sg(struct iommu_domain *domain, unsigned long iova, + struct scatterlist *sg, unsigned int nents, int prot) { struct scatterlist *s; size_t mapped = 0; @@ -1678,7 +1750,7 @@ out_err: return 0; } -EXPORT_SYMBOL_GPL(default_iommu_map_sg); +EXPORT_SYMBOL_GPL(iommu_map_sg); int iommu_domain_window_enable(struct iommu_domain *domain, u32 wnd_nr, phys_addr_t paddr, u64 size, int prot) @@ -1748,6 +1820,8 @@ static int __init iommu_init(void) NULL, kernel_kobj); BUG_ON(!iommu_group_kset); + iommu_debugfs_setup(); + return 0; } core_initcall(iommu_init); @@ -1758,7 +1832,6 @@ int iommu_domain_get_attr(struct iommu_domain *domain, struct iommu_domain_geometry *geometry; bool *paging; int ret = 0; - u32 *count; switch (attr) { case DOMAIN_ATTR_GEOMETRY: @@ -1770,15 +1843,6 @@ int iommu_domain_get_attr(struct iommu_domain *domain, paging = data; *paging = (domain->pgsize_bitmap != 0UL); break; - case DOMAIN_ATTR_WINDOWS: - count = data; - - if (domain->ops->domain_get_windows != NULL) - *count = domain->ops->domain_get_windows(domain); - else - ret = -ENODEV; - - break; default: if (!domain->ops->domain_get_attr) return -EINVAL; @@ -1794,18 +1858,8 @@ int iommu_domain_set_attr(struct iommu_domain *domain, enum iommu_attr attr, void *data) { int ret = 0; - u32 *count; switch (attr) { - case DOMAIN_ATTR_WINDOWS: - count = data; - - if (domain->ops->domain_set_windows != NULL) - ret = domain->ops->domain_set_windows(domain, *count); - else - ret = -ENODEV; - - break; default: if (domain->ops->domain_set_attr == NULL) return -EINVAL; |