diff options
| -rw-r--r-- | drivers/cxl/core/core.h | 12 | ||||
| -rw-r--r-- | drivers/cxl/core/port.c | 9 | ||||
| -rw-r--r-- | drivers/cxl/core/region.c | 45 | ||||
| -rw-r--r-- | drivers/cxl/cxl.h | 1 |
4 files changed, 66 insertions, 1 deletions
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h index fcf14b8a3c87..391aadf9e7fa 100644 --- a/drivers/cxl/core/core.h +++ b/drivers/cxl/core/core.h @@ -13,14 +13,26 @@ extern struct attribute_group cxl_base_attribute_group; extern struct device_attribute dev_attr_create_pmem_region; extern struct device_attribute dev_attr_delete_region; extern struct device_attribute dev_attr_region; +extern const struct device_type cxl_region_type; void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled); #define CXL_REGION_ATTR(x) (&dev_attr_##x.attr) +#define CXL_REGION_TYPE(x) (&cxl_region_type) #define SET_CXL_REGION_ATTR(x) (&dev_attr_##x.attr), +int cxl_region_init(void); +void cxl_region_exit(void); #else static inline void cxl_decoder_kill_region(struct cxl_endpoint_decoder *cxled) { } +static inline int cxl_region_init(void) +{ + return 0; +} +static inline void cxl_region_exit(void) +{ +} #define CXL_REGION_ATTR(x) NULL +#define CXL_REGION_TYPE(x) NULL #define SET_CXL_REGION_ATTR(x) #endif diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 40b4a72d6539..ba66ce25de30 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -51,6 +51,8 @@ static int cxl_device_id(struct device *dev) } if (is_cxl_memdev(dev)) return CXL_DEVICE_MEMORY_EXPANDER; + if (dev->type == CXL_REGION_TYPE()) + return CXL_DEVICE_REGION; return 0; } @@ -1864,8 +1866,14 @@ static __init int cxl_core_init(void) if (rc) goto err_bus; + rc = cxl_region_init(); + if (rc) + goto err_region; + return 0; +err_region: + bus_unregister(&cxl_bus_type); err_bus: destroy_workqueue(cxl_bus_wq); err_wq: @@ -1875,6 +1883,7 @@ err_wq: static void cxl_core_exit(void) { + cxl_region_exit(); bus_unregister(&cxl_bus_type); destroy_workqueue(cxl_bus_wq); cxl_memdev_exit(); diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index 800085300779..bf4e7f5499c1 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -1450,7 +1450,7 @@ static void cxl_region_release(struct device *dev) kfree(cxlr); } -static const struct device_type cxl_region_type = { +const struct device_type cxl_region_type = { .name = "cxl_region", .release = cxl_region_release, .groups = region_groups @@ -1650,4 +1650,47 @@ static ssize_t delete_region_store(struct device *dev, } DEVICE_ATTR_WO(delete_region); +static int cxl_region_probe(struct device *dev) +{ + struct cxl_region *cxlr = to_cxl_region(dev); + struct cxl_region_params *p = &cxlr->params; + int rc; + + rc = down_read_interruptible(&cxl_region_rwsem); + if (rc) { + dev_dbg(&cxlr->dev, "probe interrupted\n"); + return rc; + } + + if (p->state < CXL_CONFIG_COMMIT) { + dev_dbg(&cxlr->dev, "config state: %d\n", p->state); + rc = -ENXIO; + } + + /* + * From this point on any path that changes the region's state away from + * CXL_CONFIG_COMMIT is also responsible for releasing the driver. + */ + up_read(&cxl_region_rwsem); + + return rc; +} + +static struct cxl_driver cxl_region_driver = { + .name = "cxl_region", + .probe = cxl_region_probe, + .id = CXL_DEVICE_REGION, +}; + +int cxl_region_init(void) +{ + return cxl_driver_register(&cxl_region_driver); +} + +void cxl_region_exit(void) +{ + cxl_driver_unregister(&cxl_region_driver); +} + MODULE_IMPORT_NS(CXL); +MODULE_ALIAS_CXL(CXL_DEVICE_REGION); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 01095d78784d..e96bf8ccccf2 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -599,6 +599,7 @@ void cxl_driver_unregister(struct cxl_driver *cxl_drv); #define CXL_DEVICE_PORT 3 #define CXL_DEVICE_ROOT 4 #define CXL_DEVICE_MEMORY_EXPANDER 5 +#define CXL_DEVICE_REGION 6 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*") #define CXL_MODALIAS_FMT "cxl:t%d" |