On 1/5/2018 6:04 AM, Ioana Radulescu wrote:
> All DPIO service API functions receive a dpaa2_io service pointer
> as parameter (NULL meaning any service will do) which indicates
> the hardware resource to be used to execute the specified command.
>
> There isn't however any available API for obtaining such a service
> reference that could be used further, effectively forcing the users
> to always request a random service for DPIO operations.
> (The DPIO driver holds internally an array mapping services to cpus,
> and affine services can be indirectly requested by a couple of API
> functions: dpaa2_io_service_register and dpaa2_io_service_rearm
> use the cpu id provided by the user to select the corresponding
> service)
>
> This patch adds a function for selecting a DPIO service based on
> the specified cpu id. If the user provides a "don't care" value
> for the cpu, we revert to the default behavior and return the next
> DPIO, taken in a round-robin fashion from a list of available
> services.
>
> Signed-off-by: Ioana Radulescu <ruxandra.radulescu@xxxxxxx>
> ---
> drivers/staging/fsl-mc/bus/dpio/dpio-service.c | 17 +++++++++++++++++
> drivers/staging/fsl-mc/include/dpaa2-io.h | 2 ++
> 2 files changed, 19 insertions(+)
>
> diff --git a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
> index a8a8e15..6e8994c 100644
> --- a/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
> +++ b/drivers/staging/fsl-mc/bus/dpio/dpio-service.c
> @@ -104,6 +104,23 @@ static inline struct dpaa2_io *service_select(struct dpaa2_io *d)
> }
>
> /**
> + * dpaa2_io_service_select() - return a dpaa2_io service affined to this cpu
> + * @cpu: the cpu id
> + *
> + * Return the affine dpaa2_io service, or NULL if there is no service affined
> + * to the specified cpu. If DPAA2_IO_ANY_CPU is used, return the next available
> + * service.
> + */
> +struct dpaa2_io *dpaa2_io_service_select(int cpu)
> +{
> + if (cpu == DPAA2_IO_ANY_CPU)
> + return service_select(NULL);
> +
> + return service_select_by_cpu(NULL, cpu);
> +}
> +EXPORT_SYMBOL_GPL(dpaa2_io_service_select);
> +
> +/**
> * dpaa2_io_create() - create a dpaa2_io object.
> * @desc: the dpaa2_io descriptor
> *
> diff --git a/drivers/staging/fsl-mc/include/dpaa2-io.h b/drivers/staging/fsl-mc/include/dpaa2-io.h
> index 07ad15a..9d70251 100644
> --- a/drivers/staging/fsl-mc/include/dpaa2-io.h
> +++ b/drivers/staging/fsl-mc/include/dpaa2-io.h
> @@ -88,6 +88,8 @@ void dpaa2_io_down(struct dpaa2_io *d);
>
> irqreturn_t dpaa2_io_irq(struct dpaa2_io *obj);
>
> +struct dpaa2_io *dpaa2_io_service_select(int cpu);
> +
> /**
> * struct dpaa2_io_notification_ctx - The DPIO notification context structure
> * @cb: The callback to be invoked when the notification arrives
>
Acked-by: Roy Pledge <roy.pledge@xxxxxxx>
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