Re: [Tee-dev] [PATCHv2 1/2] optee: do drivers initialization before and after tee-supplicant run

On Sun, 24 May 2020 at 09:22, Jens Wiklander jens.wiklander@linaro.org wrote:

Hi Maxim,

On Thu, May 21, 2020 at 8:47 AM Maxim Uvarov maxim.uvarov@linaro.org wrote:

...

Some drivers (like ftpm) can operate only after tee-supplicant runs becase of tee-supplicant provides things like storage services. This patch splits probe of non tee-supplicant dependable drivers to early stage, and after tee-supplicant run probe other drivers.

Signed-off-by: Maxim Uvarov maxim.uvarov@linaro.org Suggested-by: Sumit Garg sumit.garg@linaro.org Suggested-by: Arnd Bergmann arnd@linaro.org

---

drivers/tee/optee/core.c | 25 ++++++++++++++++++++++--- drivers/tee/optee/device.c | 17 +++++++++++------ drivers/tee/optee/optee_private.h | 8 +++++++- 3 files changed, 40 insertions(+), 10 deletions(-)

diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c index 99698b8a3a74..dd2265c44907 100644 --- a/drivers/tee/optee/core.c +++ b/drivers/tee/optee/core.c @@ -17,6 +17,7 @@ #include <linux/tee_drv.h> #include <linux/types.h> #include <linux/uaccess.h> +#include <linux/workqueue.h> #include "optee_private.h" #include "optee_smc.h" #include "shm_pool.h" @@ -218,6 +219,15 @@ static void optee_get_version(struct tee_device *teedev, *vers = v; }

+static void optee_bus_scan(struct work_struct *work) +{

•   int rc;
  

•   rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP);
  

•   if (rc)
  

•           pr_err("optee_enumerate_devices failed %d\n", rc);
  

+}

static int optee_open(struct tee_context *ctx) { struct optee_context_data *ctxdata; @@ -241,8 +251,15 @@ static int optee_open(struct tee_context *ctx) kfree(ctxdata); return -EBUSY; }

•   }
  
  

•           INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
  

•           optee->scan_bus_wq = create_workqueue("optee_bus_scan");
  

•           if (!optee->scan_bus_wq) {
  

•                   pr_err("optee: couldn't create workqueue\n");
  

•                   return -ECHILD;
  

•           }
  

•           queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
  

Shouldn't this be done only the first time tee-supplicant opens the device? Normally tee-supplicant only does this once, but it might get restarted for some reason.

Yes, thanks. I will add this to the next version.

Maxim.

...

•   }
    mutex_init(&ctxdata->mutex);
    INIT_LIST_HEAD(&ctxdata->sess_list);
  
  

@@ -296,8 +313,10 @@ static void optee_release(struct tee_context *ctx)

    ctx->data = NULL;

•   if (teedev == optee->supp_teedev)
  

•   if (teedev == optee->supp_teedev) {
  

•           destroy_workqueue(optee->scan_bus_wq);
            optee_supp_release(&optee->supp);
  

•   }
  

}

static const struct tee_driver_ops optee_ops = { @@ -675,7 +694,7 @@ static int optee_probe(struct platform_device *pdev)

    platform_set_drvdata(pdev, optee);

•   rc = optee_enumerate_devices();
  

•   rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
    if (rc) {
            optee_remove(pdev);
            return rc;
  

diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c index e3a148521ec1..d4931dad07aa 100644 --- a/drivers/tee/optee/device.c +++ b/drivers/tee/optee/device.c @@ -21,7 +21,6 @@

• TEE_ERROR_BAD_PARAMETERS - Incorrect input param
• TEE_ERROR_SHORT_BUFFER - Output buffer size less than required

*/ -#define PTA_CMD_GET_DEVICES 0x0

static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) { @@ -32,7 +31,8 @@ static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data) }

static int get_devices(struct tee_context *ctx, u32 session,

•                  struct tee_shm *device_shm, u32 *shm_size)
  

•                  struct tee_shm *device_shm, u32 *shm_size,
  

•                  u32 func)
  

{ int ret = 0; struct tee_ioctl_invoke_arg inv_arg; @@ -42,7 +42,7 @@ static int get_devices(struct tee_context *ctx, u32 session, memset(&param, 0, sizeof(param));

    /* Invoke PTA_CMD_GET_DEVICES function */

•   inv_arg.func = PTA_CMD_GET_DEVICES;
  

•   inv_arg.func = func;
    inv_arg.session = session;
    inv_arg.num_params = 4;
  
  

@@ -87,7 +87,7 @@ static int optee_register_device(const uuid_t *device_uuid, u32 device_id) return rc; }

-int optee_enumerate_devices(void) +static int __optee_enumerate_devices(u32 func) { const uuid_t pta_uuid = UUID_INIT(0x7011a688, 0xddde, 0x4053, @@ -118,7 +118,7 @@ int optee_enumerate_devices(void) goto out_ctx; }

•   rc = get_devices(ctx, sess_arg.session, NULL, &shm_size);
  

•   rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
    if (rc < 0 || !shm_size)
            goto out_sess;
  
  

@@ -130,7 +130,7 @@ int optee_enumerate_devices(void) goto out_sess; }

•   rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size);
  

•   rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
    if (rc < 0)
            goto out_shm;
  
  

@@ -158,3 +158,8 @@ int optee_enumerate_devices(void)

    return rc;

}

+int optee_enumerate_devices(u32 func) +{

•   return  __optee_enumerate_devices(func);
  

+} diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h index d9c5037b4e03..6cdac4bb7253 100644 --- a/drivers/tee/optee/optee_private.h +++ b/drivers/tee/optee/optee_private.h @@ -78,6 +78,8 @@ struct optee_supp {

• @memremaped_shm virtual address of memory in shared memory pool
• @sec_caps: secure world capabilities defined by

•                 OPTEE_SMC_SEC_CAP_* in optee_smc.h
  

• • @scan_bus_wq workqueue to scan optee bus and register optee drivers
• • @scan_bus_work workq to scan optee bus and register optee drivers
  */

struct optee { struct tee_device *supp_teedev; @@ -89,6 +91,8 @@ struct optee { struct tee_shm_pool *pool; void *memremaped_shm; u32 sec_caps;

•   struct workqueue_struct *scan_bus_wq;
  

•   struct work_struct scan_bus_work;
  

};

struct optee_session { @@ -173,7 +177,9 @@ void optee_free_pages_list(void *array, size_t num_entries); void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages, size_t page_offset);

-int optee_enumerate_devices(void); +#define PTA_CMD_GET_DEVICES 0x0 +#define PTA_CMD_GET_DEVICES_SUPP 0x1 +int optee_enumerate_devices(u32 func);

/*

• Small helpers

-- 2.17.1