diff options
Diffstat (limited to 'drivers/iommu/apple-dart.c')
| -rw-r--r-- | drivers/iommu/apple-dart.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/drivers/iommu/apple-dart.c b/drivers/iommu/apple-dart.c index 95ba3caeb401..e13501541fdd 100644 --- a/drivers/iommu/apple-dart.c +++ b/drivers/iommu/apple-dart.c @@ -36,7 +36,7 @@ #define DART_MAX_STREAMS 256 #define DART_MAX_TTBR 4 -#define MAX_DARTS_PER_DEVICE 2 +#define MAX_DARTS_PER_DEVICE 3 /* Common registers */ @@ -277,6 +277,9 @@ struct apple_dart_domain { * @streams: streams for this device */ struct apple_dart_master_cfg { + /* Intersection of DART capabilitles */ + u32 supports_bypass : 1; + struct apple_dart_stream_map stream_maps[MAX_DARTS_PER_DEVICE]; }; @@ -684,7 +687,7 @@ static int apple_dart_attach_dev_identity(struct iommu_domain *domain, struct apple_dart_stream_map *stream_map; int i; - if (!cfg->stream_maps[0].dart->supports_bypass) + if (!cfg->supports_bypass) return -EINVAL; for_each_stream_map(i, cfg, stream_map) @@ -792,20 +795,23 @@ static int apple_dart_of_xlate(struct device *dev, return -EINVAL; sid = args->args[0]; - if (!cfg) + if (!cfg) { cfg = kzalloc(sizeof(*cfg), GFP_KERNEL); - if (!cfg) - return -ENOMEM; + if (!cfg) + return -ENOMEM; + /* Will be ANDed with DART capabilities */ + cfg->supports_bypass = true; + } dev_iommu_priv_set(dev, cfg); cfg_dart = cfg->stream_maps[0].dart; if (cfg_dart) { - if (cfg_dart->supports_bypass != dart->supports_bypass) - return -EINVAL; if (cfg_dart->pgsize != dart->pgsize) return -EINVAL; } + cfg->supports_bypass &= dart->supports_bypass; + for (i = 0; i < MAX_DARTS_PER_DEVICE; ++i) { if (cfg->stream_maps[i].dart == dart) { set_bit(sid, cfg->stream_maps[i].sidmap); @@ -945,7 +951,7 @@ static int apple_dart_def_domain_type(struct device *dev) if (cfg->stream_maps[0].dart->pgsize > PAGE_SIZE) return IOMMU_DOMAIN_IDENTITY; - if (!cfg->stream_maps[0].dart->supports_bypass) + if (!cfg->supports_bypass) return IOMMU_DOMAIN_DMA; return 0; |