| Message ID | 1548062959-31860-2-git-send-email-sumit.garg@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce TEE bus driver framework | expand |
Hi Sumit, On Mon, Jan 21, 2019 at 3:00 PM Sumit Garg <sumit.garg@linaro.org> wrote: > > Introduce a generic TEE bus driver concept for TEE based kernel drivers > which would like to communicate with TEE based devices/services. > > In this TEE bus concept, devices/services are identified via Universally > Unique Identifier (UUID) and drivers register a table of device UUIDs > which they can support. > > So this TEE bus framework registers a match() callback function which > iterates over the driver UUID table to find a corresponding match for > device UUID. If a match is found, then this particular device is probed > via corresponding probe api registered by the driver. This process > happens whenever a device or a driver is registered with TEE bus. > > Also this framework allows for device enumeration to be specific to > corresponding TEE implementation like OP-TEE etc. > > Signed-off-by: Sumit Garg <sumit.garg@linaro.org> > --- > drivers/tee/tee_core.c | 45 +++++++++++++++++++++++++++++++++++++++++---- > include/linux/tee_drv.h | 37 ++++++++++++++++++++++++++++++++++++- > 2 files changed, 77 insertions(+), 5 deletions(-) > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > index 7b2bb4c..55370d5 100644 > --- a/drivers/tee/tee_core.c > +++ b/drivers/tee/tee_core.c > @@ -15,7 +15,6 @@ > #define pr_fmt(fmt) "%s: " fmt, __func__ > > #include <linux/cdev.h> > -#include <linux/device.h> > #include <linux/fs.h> > #include <linux/idr.h> > #include <linux/module.h> > @@ -1027,6 +1026,30 @@ int tee_client_invoke_func(struct tee_context *ctx, > } > EXPORT_SYMBOL_GPL(tee_client_invoke_func); > > +static int tee_client_device_match(struct device *dev, > + struct device_driver *drv) > +{ > + const tee_client_device_id *id_table; > + struct tee_client_device *tee_device; > + > + id_table = to_tee_client_driver(drv)->id_table; > + tee_device = to_tee_client_device(dev); > + > + while (!uuid_is_null(id_table)) { > + if (uuid_equal(&tee_device->id, id_table)) > + return 1; > + id_table++; > + } > + > + return 0; > +} > + > +struct bus_type tee_bus_type = { > + .name = "tee", > + .match = tee_client_device_match, > +}; > +EXPORT_SYMBOL_GPL(tee_bus_type); > + > static int __init tee_init(void) > { > int rc; > @@ -1040,18 +1063,32 @@ static int __init tee_init(void) > rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee"); > if (rc) { > pr_err("failed to allocate char dev region\n"); > - class_destroy(tee_class); > - tee_class = NULL; > + goto out_unreg_class; > } > > + rc = bus_register(&tee_bus_type); > + if (rc) { > + pr_err("failed to register tee bus\n"); > + goto out_unreg_chrdev; > + } > + > + return 0; > + > +out_unreg_chrdev: > + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); > +out_unreg_class: > + class_destroy(tee_class); > + tee_class = NULL; > + > return rc; > } > > static void __exit tee_exit(void) > { > + bus_unregister(&tee_bus_type); > + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); > class_destroy(tee_class); > tee_class = NULL; > - unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); > } > > subsys_initcall(tee_init); > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h > index 6cfe058..ba985d8 100644 > --- a/include/linux/tee_drv.h > +++ b/include/linux/tee_drv.h > @@ -15,11 +15,13 @@ > #ifndef __TEE_DRV_H > #define __TEE_DRV_H > > -#include <linux/types.h> > +#include <linux/device.h> > #include <linux/idr.h> > #include <linux/kref.h> > #include <linux/list.h> > #include <linux/tee.h> > +#include <linux/types.h> > +#include <linux/uuid.h> > > /* > * The file describes the API provided by the generic TEE driver to the > @@ -538,4 +540,37 @@ static inline bool tee_param_is_memref(struct tee_param *param) > } > } > > +extern struct bus_type tee_bus_type; > + > +/* > + * For TEE based client devices we use the device uuid as the > + * identifier. > + */ > +typedef uuid_t tee_client_device_id; > + > +/** > + * struct tee_client_device - tee based device > + * @id: device identifier > + * @dev: device structure > + */ > +struct tee_client_device { > + tee_client_device_id id; > + struct device dev; > +}; > + > +#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev) > + > +/** > + * struct tee_client_driver - tee client driver > + * @id_table: device id table supported by this driver > + * @driver: driver structure > + */ > +struct tee_client_driver { > + const tee_client_device_id *id_table; > + struct device_driver driver; > +}; > + > +#define to_tee_client_driver(d) \ > + container_of(d, struct tee_client_driver, driver) > + > #endif /*__TEE_DRV_H*/ > -- > 2.7.4 > LGTM, if there are no further comments on this patch please free to add: Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com> Thanks.
On Mon, 21 Jan 2019 at 20:58, Bhupesh Sharma <bhsharma@redhat.com> wrote: > > Hi Sumit, > > On Mon, Jan 21, 2019 at 3:00 PM Sumit Garg <sumit.garg@linaro.org> wrote: > > > > Introduce a generic TEE bus driver concept for TEE based kernel drivers > > which would like to communicate with TEE based devices/services. > > > > In this TEE bus concept, devices/services are identified via Universally > > Unique Identifier (UUID) and drivers register a table of device UUIDs > > which they can support. > > > > So this TEE bus framework registers a match() callback function which > > iterates over the driver UUID table to find a corresponding match for > > device UUID. If a match is found, then this particular device is probed > > via corresponding probe api registered by the driver. This process > > happens whenever a device or a driver is registered with TEE bus. > > > > Also this framework allows for device enumeration to be specific to > > corresponding TEE implementation like OP-TEE etc. > > > > Signed-off-by: Sumit Garg <sumit.garg@linaro.org> > > --- > > drivers/tee/tee_core.c | 45 +++++++++++++++++++++++++++++++++++++++++---- > > include/linux/tee_drv.h | 37 ++++++++++++++++++++++++++++++++++++- > > 2 files changed, 77 insertions(+), 5 deletions(-) > > > > diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c > > index 7b2bb4c..55370d5 100644 > > --- a/drivers/tee/tee_core.c > > +++ b/drivers/tee/tee_core.c > > @@ -15,7 +15,6 @@ > > #define pr_fmt(fmt) "%s: " fmt, __func__ > > > > #include <linux/cdev.h> > > -#include <linux/device.h> > > #include <linux/fs.h> > > #include <linux/idr.h> > > #include <linux/module.h> > > @@ -1027,6 +1026,30 @@ int tee_client_invoke_func(struct tee_context *ctx, > > } > > EXPORT_SYMBOL_GPL(tee_client_invoke_func); > > > > +static int tee_client_device_match(struct device *dev, > > + struct device_driver *drv) > > +{ > > + const tee_client_device_id *id_table; > > + struct tee_client_device *tee_device; > > + > > + id_table = to_tee_client_driver(drv)->id_table; > > + tee_device = to_tee_client_device(dev); > > + > > + while (!uuid_is_null(id_table)) { > > + if (uuid_equal(&tee_device->id, id_table)) > > + return 1; > > + id_table++; > > + } > > + > > + return 0; > > +} > > + > > +struct bus_type tee_bus_type = { > > + .name = "tee", > > + .match = tee_client_device_match, > > +}; > > +EXPORT_SYMBOL_GPL(tee_bus_type); > > + > > static int __init tee_init(void) > > { > > int rc; > > @@ -1040,18 +1063,32 @@ static int __init tee_init(void) > > rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee"); > > if (rc) { > > pr_err("failed to allocate char dev region\n"); > > - class_destroy(tee_class); > > - tee_class = NULL; > > + goto out_unreg_class; > > } > > > > + rc = bus_register(&tee_bus_type); > > + if (rc) { > > + pr_err("failed to register tee bus\n"); > > + goto out_unreg_chrdev; > > + } > > + > > + return 0; > > + > > +out_unreg_chrdev: > > + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); > > +out_unreg_class: > > + class_destroy(tee_class); > > + tee_class = NULL; > > + > > return rc; > > } > > > > static void __exit tee_exit(void) > > { > > + bus_unregister(&tee_bus_type); > > + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); > > class_destroy(tee_class); > > tee_class = NULL; > > - unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); > > } > > > > subsys_initcall(tee_init); > > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h > > index 6cfe058..ba985d8 100644 > > --- a/include/linux/tee_drv.h > > +++ b/include/linux/tee_drv.h > > @@ -15,11 +15,13 @@ > > #ifndef __TEE_DRV_H > > #define __TEE_DRV_H > > > > -#include <linux/types.h> > > +#include <linux/device.h> > > #include <linux/idr.h> > > #include <linux/kref.h> > > #include <linux/list.h> > > #include <linux/tee.h> > > +#include <linux/types.h> > > +#include <linux/uuid.h> > > > > /* > > * The file describes the API provided by the generic TEE driver to the > > @@ -538,4 +540,37 @@ static inline bool tee_param_is_memref(struct tee_param *param) > > } > > } > > > > +extern struct bus_type tee_bus_type; > > + > > +/* > > + * For TEE based client devices we use the device uuid as the > > + * identifier. > > + */ > > +typedef uuid_t tee_client_device_id; > > + > > +/** > > + * struct tee_client_device - tee based device > > + * @id: device identifier > > + * @dev: device structure > > + */ > > +struct tee_client_device { > > + tee_client_device_id id; > > + struct device dev; > > +}; > > + > > +#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev) > > + > > +/** > > + * struct tee_client_driver - tee client driver > > + * @id_table: device id table supported by this driver > > + * @driver: driver structure > > + */ > > +struct tee_client_driver { > > + const tee_client_device_id *id_table; > > + struct device_driver driver; > > +}; > > + > > +#define to_tee_client_driver(d) \ > > + container_of(d, struct tee_client_driver, driver) > > + > > #endif /*__TEE_DRV_H*/ > > -- > > 2.7.4 > > > > LGTM, if there are no further comments on this patch please free to add: > Reviewed-by: Bhupesh Sharma <bhsharma@redhat.com> > Thanks for this review tag. Actually I have to add support in module device table for TEE bus devices as per Ard's comments on patch #4. So that will require changes in this patch in next version. -Sumit > Thanks.
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 7b2bb4c..55370d5 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -15,7 +15,6 @@ #define pr_fmt(fmt) "%s: " fmt, __func__ #include <linux/cdev.h> -#include <linux/device.h> #include <linux/fs.h> #include <linux/idr.h> #include <linux/module.h> @@ -1027,6 +1026,30 @@ int tee_client_invoke_func(struct tee_context *ctx, } EXPORT_SYMBOL_GPL(tee_client_invoke_func); +static int tee_client_device_match(struct device *dev, + struct device_driver *drv) +{ + const tee_client_device_id *id_table; + struct tee_client_device *tee_device; + + id_table = to_tee_client_driver(drv)->id_table; + tee_device = to_tee_client_device(dev); + + while (!uuid_is_null(id_table)) { + if (uuid_equal(&tee_device->id, id_table)) + return 1; + id_table++; + } + + return 0; +} + +struct bus_type tee_bus_type = { + .name = "tee", + .match = tee_client_device_match, +}; +EXPORT_SYMBOL_GPL(tee_bus_type); + static int __init tee_init(void) { int rc; @@ -1040,18 +1063,32 @@ static int __init tee_init(void) rc = alloc_chrdev_region(&tee_devt, 0, TEE_NUM_DEVICES, "tee"); if (rc) { pr_err("failed to allocate char dev region\n"); - class_destroy(tee_class); - tee_class = NULL; + goto out_unreg_class; } + rc = bus_register(&tee_bus_type); + if (rc) { + pr_err("failed to register tee bus\n"); + goto out_unreg_chrdev; + } + + return 0; + +out_unreg_chrdev: + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); +out_unreg_class: + class_destroy(tee_class); + tee_class = NULL; + return rc; } static void __exit tee_exit(void) { + bus_unregister(&tee_bus_type); + unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); class_destroy(tee_class); tee_class = NULL; - unregister_chrdev_region(tee_devt, TEE_NUM_DEVICES); } subsys_initcall(tee_init); diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h index 6cfe058..ba985d8 100644 --- a/include/linux/tee_drv.h +++ b/include/linux/tee_drv.h @@ -15,11 +15,13 @@ #ifndef __TEE_DRV_H #define __TEE_DRV_H -#include <linux/types.h> +#include <linux/device.h> #include <linux/idr.h> #include <linux/kref.h> #include <linux/list.h> #include <linux/tee.h> +#include <linux/types.h> +#include <linux/uuid.h> /* * The file describes the API provided by the generic TEE driver to the @@ -538,4 +540,37 @@ static inline bool tee_param_is_memref(struct tee_param *param) } } +extern struct bus_type tee_bus_type; + +/* + * For TEE based client devices we use the device uuid as the + * identifier. + */ +typedef uuid_t tee_client_device_id; + +/** + * struct tee_client_device - tee based device + * @id: device identifier + * @dev: device structure + */ +struct tee_client_device { + tee_client_device_id id; + struct device dev; +}; + +#define to_tee_client_device(d) container_of(d, struct tee_client_device, dev) + +/** + * struct tee_client_driver - tee client driver + * @id_table: device id table supported by this driver + * @driver: driver structure + */ +struct tee_client_driver { + const tee_client_device_id *id_table; + struct device_driver driver; +}; + +#define to_tee_client_driver(d) \ + container_of(d, struct tee_client_driver, driver) + #endif /*__TEE_DRV_H*/
Introduce a generic TEE bus driver concept for TEE based kernel drivers which would like to communicate with TEE based devices/services. In this TEE bus concept, devices/services are identified via Universally Unique Identifier (UUID) and drivers register a table of device UUIDs which they can support. So this TEE bus framework registers a match() callback function which iterates over the driver UUID table to find a corresponding match for device UUID. If a match is found, then this particular device is probed via corresponding probe api registered by the driver. This process happens whenever a device or a driver is registered with TEE bus. Also this framework allows for device enumeration to be specific to corresponding TEE implementation like OP-TEE etc. Signed-off-by: Sumit Garg <sumit.garg@linaro.org> --- drivers/tee/tee_core.c | 45 +++++++++++++++++++++++++++++++++++++++++---- include/linux/tee_drv.h | 37 ++++++++++++++++++++++++++++++++++++- 2 files changed, 77 insertions(+), 5 deletions(-)