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Message-ID: <20230412170109.GB86761@p14s>
Date: Wed, 12 Apr 2023 11:01:09 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: MD Danish Anwar <danishanwar@...com>
Cc: "Andrew F. Davis" <afd@...com>, Suman Anna <s-anna@...com>,
Roger Quadros <rogerq@...nel.org>,
Vignesh Raghavendra <vigneshr@...com>,
Tero Kristo <kristo@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Santosh Shilimkar <ssantosh@...nel.org>,
Nishanth Menon <nm@...com>, linux-remoteproc@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-omap@...r.kernel.org, srk@...com, devicetree@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH v8 2/4] soc: ti: pruss: Add
pruss_{request,release}_mem_region() API
On Wed, Apr 12, 2023 at 04:00:10PM +0530, MD Danish Anwar wrote:
> From: "Andrew F. Davis" <afd@...com>
>
> Add two new API - pruss_request_mem_region() & pruss_release_mem_region(),
> to the PRUSS platform driver to allow client drivers to acquire and release
> the common memory resources present within a PRU-ICSS subsystem. This
> allows the client drivers to directly manipulate the respective memories,
> as per their design contract with the associated firmware.
>
> Co-developed-by: Suman Anna <s-anna@...com>
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Andrew F. Davis <afd@...com>
> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@...aro.org>
> Reviewed-by: Roger Quadros <rogerq@...nel.org>
> Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> Reviewed-by: Tony Lindgren <tony@...mide.com>
> Reviewed-by: Simon Horman <simon.horman@...igine.com>
> Signed-off-by: MD Danish Anwar <danishanwar@...com>
> ---
> drivers/soc/ti/pruss.c | 77 ++++++++++++++++++++++++++++++++++++
> include/linux/pruss_driver.h | 22 +++++++++++
> 2 files changed, 99 insertions(+)
>
Acked-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
> index 3fac92df8790..8ada3758b31a 100644
> --- a/drivers/soc/ti/pruss.c
> +++ b/drivers/soc/ti/pruss.c
> @@ -92,6 +92,82 @@ void pruss_put(struct pruss *pruss)
> }
> EXPORT_SYMBOL_GPL(pruss_put);
>
> +/**
> + * pruss_request_mem_region() - request a memory resource
> + * @pruss: the pruss instance
> + * @mem_id: the memory resource id
> + * @region: pointer to memory region structure to be filled in
> + *
> + * This function allows a client driver to request a memory resource,
> + * and if successful, will let the client driver own the particular
> + * memory region until released using the pruss_release_mem_region()
> + * API.
> + *
> + * Return: 0 if requested memory region is available (in such case pointer to
> + * memory region is returned via @region), an error otherwise
> + */
> +int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
> + struct pruss_mem_region *region)
> +{
> + if (!pruss || !region || mem_id >= PRUSS_MEM_MAX)
> + return -EINVAL;
> +
> + mutex_lock(&pruss->lock);
> +
> + if (pruss->mem_in_use[mem_id]) {
> + mutex_unlock(&pruss->lock);
> + return -EBUSY;
> + }
> +
> + *region = pruss->mem_regions[mem_id];
> + pruss->mem_in_use[mem_id] = region;
> +
> + mutex_unlock(&pruss->lock);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(pruss_request_mem_region);
> +
> +/**
> + * pruss_release_mem_region() - release a memory resource
> + * @pruss: the pruss instance
> + * @region: the memory region to release
> + *
> + * This function is the complimentary function to
> + * pruss_request_mem_region(), and allows the client drivers to
> + * release back a memory resource.
> + *
> + * Return: 0 on success, an error code otherwise
> + */
> +int pruss_release_mem_region(struct pruss *pruss,
> + struct pruss_mem_region *region)
> +{
> + int id;
> +
> + if (!pruss || !region)
> + return -EINVAL;
> +
> + mutex_lock(&pruss->lock);
> +
> + /* find out the memory region being released */
> + for (id = 0; id < PRUSS_MEM_MAX; id++) {
> + if (pruss->mem_in_use[id] == region)
> + break;
> + }
> +
> + if (id == PRUSS_MEM_MAX) {
> + mutex_unlock(&pruss->lock);
> + return -EINVAL;
> + }
> +
> + pruss->mem_in_use[id] = NULL;
> +
> + mutex_unlock(&pruss->lock);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(pruss_release_mem_region);
> +
> static void pruss_of_free_clk_provider(void *data)
> {
> struct device_node *clk_mux_np = data;
> @@ -294,6 +370,7 @@ static int pruss_probe(struct platform_device *pdev)
> return -ENOMEM;
>
> pruss->dev = dev;
> + mutex_init(&pruss->lock);
>
> child = of_get_child_by_name(np, "memories");
> if (!child) {
> diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_driver.h
> index cb40c2b31045..c8f2e53b911b 100644
> --- a/include/linux/pruss_driver.h
> +++ b/include/linux/pruss_driver.h
> @@ -9,6 +9,7 @@
> #ifndef _PRUSS_DRIVER_H_
> #define _PRUSS_DRIVER_H_
>
> +#include <linux/mutex.h>
> #include <linux/remoteproc/pruss.h>
> #include <linux/types.h>
> #include <linux/err.h>
> @@ -41,6 +42,8 @@ struct pruss_mem_region {
> * @cfg_base: base iomap for CFG region
> * @cfg_regmap: regmap for config region
> * @mem_regions: data for each of the PRUSS memory regions
> + * @mem_in_use: to indicate if memory resource is in use
> + * @lock: mutex to serialize access to resources
> * @core_clk_mux: clk handle for PRUSS CORE_CLK_MUX
> * @iep_clk_mux: clk handle for PRUSS IEP_CLK_MUX
> */
> @@ -49,6 +52,8 @@ struct pruss {
> void __iomem *cfg_base;
> struct regmap *cfg_regmap;
> struct pruss_mem_region mem_regions[PRUSS_MEM_MAX];
> + struct pruss_mem_region *mem_in_use[PRUSS_MEM_MAX];
> + struct mutex lock; /* PRU resource lock */
> struct clk *core_clk_mux;
> struct clk *iep_clk_mux;
> };
> @@ -57,6 +62,10 @@ struct pruss {
>
> struct pruss *pruss_get(struct rproc *rproc);
> void pruss_put(struct pruss *pruss);
> +int pruss_request_mem_region(struct pruss *pruss, enum pruss_mem mem_id,
> + struct pruss_mem_region *region);
> +int pruss_release_mem_region(struct pruss *pruss,
> + struct pruss_mem_region *region);
>
> #else
>
> @@ -67,6 +76,19 @@ static inline struct pruss *pruss_get(struct rproc *rproc)
>
> static inline void pruss_put(struct pruss *pruss) { }
>
> +static inline int pruss_request_mem_region(struct pruss *pruss,
> + enum pruss_mem mem_id,
> + struct pruss_mem_region *region)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> +static inline int pruss_release_mem_region(struct pruss *pruss,
> + struct pruss_mem_region *region)
> +{
> + return -EOPNOTSUPP;
> +}
> +
> #endif /* CONFIG_TI_PRUSS */
>
> #endif /* _PRUSS_DRIVER_H_ */
> --
> 2.34.1
>
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