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| author | Joerg Roedel <jroedel@suse.de> | 2019-08-19 15:22:47 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-08-23 10:09:58 +0200 |
| commit | 8a69961c7f7583742ab9064feab5ea533a6b1b97 (patch) | |
| tree | 64117168f01305730249d575a64cacd631b3c229 | |
| parent | iommu: Remember when default domain type was set on kernel command line (diff) | |
| download | linux-8a69961c7f7583742ab9064feab5ea533a6b1b97.tar.xz linux-8a69961c7f7583742ab9064feab5ea533a6b1b97.zip | |
iommu: Add helpers to set/get default domain type
Add a couple of functions to allow changing the default
domain type from architecture code and a function for iommu
drivers to request whether the default domain is
passthrough.
Signed-off-by: Joerg Roedel <jroedel@suse.de>
| -rw-r--r-- | drivers/iommu/iommu.c | 22 | ||||
| -rw-r--r-- | include/linux/iommu.h | 16 |
2 files changed, 38 insertions, 0 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 0ae34cca0d4a..c5e0fc5ffe8b 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2213,6 +2213,28 @@ int iommu_request_dma_domain_for_dev(struct device *dev) return request_default_domain_for_dev(dev, IOMMU_DOMAIN_DMA); } +void iommu_set_default_passthrough(bool cmd_line) +{ + if (cmd_line) + iommu_set_cmd_line_dma_api(); + + iommu_def_domain_type = IOMMU_DOMAIN_IDENTITY; +} + +void iommu_set_default_translated(bool cmd_line) +{ + if (cmd_line) + iommu_set_cmd_line_dma_api(); + + iommu_def_domain_type = IOMMU_DOMAIN_DMA; +} + +bool iommu_default_passthrough(void) +{ + return iommu_def_domain_type == IOMMU_DOMAIN_IDENTITY; +} +EXPORT_SYMBOL_GPL(iommu_default_passthrough); + const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) { const struct iommu_ops *ops = NULL; diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 64ebaff33455..29bac5345563 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -436,6 +436,9 @@ extern void iommu_get_resv_regions(struct device *dev, struct list_head *list); extern void iommu_put_resv_regions(struct device *dev, struct list_head *list); extern int iommu_request_dm_for_dev(struct device *dev); extern int iommu_request_dma_domain_for_dev(struct device *dev); +extern void iommu_set_default_passthrough(bool cmd_line); +extern void iommu_set_default_translated(bool cmd_line); +extern bool iommu_default_passthrough(void); extern struct iommu_resv_region * iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot, enum iommu_resv_type type); @@ -736,6 +739,19 @@ static inline int iommu_request_dma_domain_for_dev(struct device *dev) return -ENODEV; } +static inline void iommu_set_default_passthrough(bool cmd_line) +{ +} + +static inline void iommu_set_default_translated(bool cmd_line) +{ +} + +static inline bool iommu_default_passthrough(void) +{ + return true; +} + static inline int iommu_attach_group(struct iommu_domain *domain, struct iommu_group *group) { |