Re: [PATCH 9/9] firmware: arm_ffa: Split up ffa_dev_ops into info, message and memory operations

[Jens Wiklander]

On Tue, Aug 30, 2022 at 12:07 PM Sudeep Holla <sudeep.holla@xxxxxxx> wrote:
>
> In preparation to make memory operations accessible for a non
> ffa_driver/device, it is better to split the ffa_dev_ops into different
> categories of operations: info, message and memory. The info and memory
> are ffa_device independent and can be used without any associated
> ffa_device from a non ffa_driver.
>
> However, we don't export these info and memory APIs yet without the user.
> The first users of these APIs can export them.
>
> Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
> ---
>  drivers/firmware/arm_ffa/driver.c | 14 ++++++++++++-
>  drivers/tee/optee/ffa_abi.c       | 33 +++++++++++++++++--------------
>  include/linux/arm_ffa.h           | 14 ++++++++++++-
>  3 files changed, 44 insertions(+), 17 deletions(-)

Reviewed-by: Jens Wiklander <jens.wiklander@xxxxxxxxxx>

>
> diff --git a/drivers/firmware/arm_ffa/driver.c b/drivers/firmware/arm_ffa/driver.c
> index 6822241168d6..d7a90c49fdcf 100644
> --- a/drivers/firmware/arm_ffa/driver.c
> +++ b/drivers/firmware/arm_ffa/driver.c
> @@ -676,16 +676,28 @@ static int ffa_memory_lend(struct ffa_mem_ops_args *args)
>         return ffa_memory_ops(FFA_MEM_LEND, args);
>  }
>
> -static const struct ffa_dev_ops ffa_ops = {
> +static const struct ffa_dev_info_ops ffa_info_ops = {
>         .api_version_get = ffa_api_version_get,
>         .partition_info_get = ffa_partition_info_get,
> +};
> +
> +static const struct ffa_dev_msg_ops ffa_msg_ops = {
>         .mode_32bit_set = ffa_mode_32bit_set,
>         .sync_send_receive = ffa_sync_send_receive,
> +};
> +
> +static const struct ffa_dev_mem_ops ffa_mem_ops = {
>         .memory_reclaim = ffa_memory_reclaim,
>         .memory_share = ffa_memory_share,
>         .memory_lend = ffa_memory_lend,
>  };
>
> +static const struct ffa_dev_ops ffa_ops = {
> +       .info_ops = &ffa_info_ops,
> +       .msg_ops = &ffa_msg_ops,
> +       .mem_ops = &ffa_mem_ops,
> +};
> +
>  void ffa_device_match_uuid(struct ffa_device *ffa_dev, const uuid_t *uuid)
>  {
>         int count, idx;
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index 7257b42d0545..bbc63fd145a1 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -272,7 +272,7 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
>  {
>         struct optee *optee = tee_get_drvdata(ctx->teedev);
>         struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
> -       const struct ffa_dev_ops *ffa_ops = ffa_dev->ops;
> +       const struct ffa_dev_mem_ops *ffa_mem_ops = ffa_dev->ops->mem_ops;
>         struct ffa_mem_region_attributes mem_attr = {
>                 .receiver = ffa_dev->vm_id,
>                 .attrs = FFA_MEM_RW,
> @@ -294,14 +294,14 @@ static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm,
>         if (rc)
>                 return rc;
>         args.sg = sgt.sgl;
> -       rc = ffa_ops->memory_share(&args);
> +       rc = ffa_mem_ops->memory_share(&args);
>         sg_free_table(&sgt);
>         if (rc)
>                 return rc;
>
>         rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
>         if (rc) {
> -               ffa_ops->memory_reclaim(args.g_handle, 0);
> +               ffa_mem_ops->memory_reclaim(args.g_handle, 0);
>                 return rc;
>         }
>
> @@ -315,7 +315,8 @@ static int optee_ffa_shm_unregister(struct tee_context *ctx,
>  {
>         struct optee *optee = tee_get_drvdata(ctx->teedev);
>         struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
> -       const struct ffa_dev_ops *ffa_ops = ffa_dev->ops;
> +       const struct ffa_dev_msg_ops *ffa_msg_ops = ffa_dev->ops->msg_ops;
> +       const struct ffa_dev_mem_ops *ffa_mem_ops = ffa_dev->ops->mem_ops;
>         u64 global_handle = shm->sec_world_id;
>         struct ffa_send_direct_data data = {
>                 .data0 = OPTEE_FFA_UNREGISTER_SHM,
> @@ -327,11 +328,11 @@ static int optee_ffa_shm_unregister(struct tee_context *ctx,
>         optee_shm_rem_ffa_handle(optee, global_handle);
>         shm->sec_world_id = 0;
>
> -       rc = ffa_ops->sync_send_receive(ffa_dev, &data);
> +       rc = ffa_msg_ops->sync_send_receive(ffa_dev, &data);
>         if (rc)
>                 pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);
>
> -       rc = ffa_ops->memory_reclaim(global_handle, 0);
> +       rc = ffa_mem_ops->memory_reclaim(global_handle, 0);
>         if (rc)
>                 pr_err("mem_reclaim: 0x%llx %d", global_handle, rc);
>
> @@ -342,7 +343,7 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
>                                          struct tee_shm *shm)
>  {
>         struct optee *optee = tee_get_drvdata(ctx->teedev);
> -       const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_dev->ops;
> +       const struct ffa_dev_mem_ops *ffa_mem_ops;
>         u64 global_handle = shm->sec_world_id;
>         int rc;
>
> @@ -353,7 +354,8 @@ static int optee_ffa_shm_unregister_supp(struct tee_context *ctx,
>          */
>
>         optee_shm_rem_ffa_handle(optee, global_handle);
> -       rc = ffa_ops->memory_reclaim(global_handle, 0);
> +       ffa_mem_ops = optee->ffa.ffa_dev->ops->mem_ops;
> +       rc = ffa_mem_ops->memory_reclaim(global_handle, 0);
>         if (rc)
>                 pr_err("mem_reclaim: 0x%llx %d", global_handle, rc);
>
> @@ -530,7 +532,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
>  {
>         struct optee *optee = tee_get_drvdata(ctx->teedev);
>         struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
> -       const struct ffa_dev_ops *ffa_ops = ffa_dev->ops;
> +       const struct ffa_dev_msg_ops *ffa_msg_ops = ffa_dev->ops->msg_ops;
>         struct optee_call_waiter w;
>         u32 cmd = data->data0;
>         u32 w4 = data->data1;
> @@ -541,7 +543,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
>         /* Initialize waiter */
>         optee_cq_wait_init(&optee->call_queue, &w);
>         while (true) {
> -               rc = ffa_ops->sync_send_receive(ffa_dev, data);
> +               rc = ffa_msg_ops->sync_send_receive(ffa_dev, data);
>                 if (rc)
>                         goto done;
>
> @@ -576,7 +578,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
>                  * OP-TEE has returned with a RPC request.
>                  *
>                  * Note that data->data4 (passed in register w7) is already
> -                * filled in by ffa_ops->sync_send_receive() returning
> +                * filled in by ffa_mem_ops->sync_send_receive() returning
>                  * above.
>                  */
>                 cond_resched();
> @@ -654,12 +656,13 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
>  static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
>                                         const struct ffa_dev_ops *ops)
>  {
> +       const struct ffa_dev_msg_ops *ffa_msg_ops = ops->msg_ops;
>         struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
>         int rc;
>
> -       ops->mode_32bit_set(ffa_dev);
> +       ffa_msg_ops->mode_32bit_set(ffa_dev);
>
> -       rc = ops->sync_send_receive(ffa_dev, &data);
> +       rc = ffa_msg_ops->sync_send_receive(ffa_dev, &data);
>         if (rc) {
>                 pr_err("Unexpected error %d\n", rc);
>                 return false;
> @@ -672,7 +675,7 @@ static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev,
>         }
>
>         data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION };
> -       rc = ops->sync_send_receive(ffa_dev, &data);
> +       rc = ffa_msg_ops->sync_send_receive(ffa_dev, &data);
>         if (rc) {
>                 pr_err("Unexpected error %d\n", rc);
>                 return false;
> @@ -694,7 +697,7 @@ static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev,
>         struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
>         int rc;
>
> -       rc = ops->sync_send_receive(ffa_dev, &data);
> +       rc = ops->msg_ops->sync_send_receive(ffa_dev, &data);
>         if (rc) {
>                 pr_err("Unexpected error %d", rc);
>                 return false;
> diff --git a/include/linux/arm_ffa.h b/include/linux/arm_ffa.h
> index b40afa7933dc..45e2b83d2364 100644
> --- a/include/linux/arm_ffa.h
> +++ b/include/linux/arm_ffa.h
> @@ -255,16 +255,28 @@ struct ffa_mem_ops_args {
>         struct ffa_mem_region_attributes *attrs;
>  };
>
> -struct ffa_dev_ops {
> +struct ffa_dev_info_ops {
>         u32 (*api_version_get)(void);
>         int (*partition_info_get)(const char *uuid_str,
>                                   struct ffa_partition_info *buffer);
> +};
> +
> +struct ffa_dev_msg_ops {
>         void (*mode_32bit_set)(struct ffa_device *dev);
>         int (*sync_send_receive)(struct ffa_device *dev,
>                                  struct ffa_send_direct_data *data);
> +};
> +
> +struct ffa_dev_mem_ops {
>         int (*memory_reclaim)(u64 g_handle, u32 flags);
>         int (*memory_share)(struct ffa_mem_ops_args *args);
>         int (*memory_lend)(struct ffa_mem_ops_args *args);
>  };
>
> +struct ffa_dev_ops {
> +       const struct ffa_dev_info_ops *info_ops;
> +       const struct ffa_dev_msg_ops *msg_ops;
> +       const struct ffa_dev_mem_ops *mem_ops;
> +};
> +
>  #endif /* _LINUX_ARM_FFA_H */
> --
> 2.37.2
>