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Message-ID: <67dd1d04-147d-0e40-c06b-6e1e0dd05f13@kernel.org>
Date: Tue, 21 Mar 2023 11:24:42 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Md Danish Anwar <a0501179@...com>, Andrew Davis <afd@...com>,
MD Danish Anwar <danishanwar@...com>,
Suman Anna <s-anna@...com>,
Vignesh Raghavendra <vigneshr@...com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Bjorn Andersson <andersson@...nel.org>,
Santosh Shilimkar <ssantosh@...nel.org>,
Nishanth Menon <nm@...com>
Cc: 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: [EXTERNAL] Re: [PATCH v4 2/5] soc: ti: pruss: Add
pruss_{request,release}_mem_region() API
Hi,
On 21/03/2023 07:23, Md Danish Anwar wrote:
> Hi Andrew, Roger,
>
> On 20/03/23 21:48, Andrew Davis wrote:
>> On 3/20/23 12:11 AM, Md Danish Anwar wrote:
>>> Hi Roger,
>>>
>>> On 17/03/23 14:26, Roger Quadros wrote:
>>>> Hi Andrew & Danish,
>>>>
>>>>
>>>> On 13/03/2023 13:11, 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>
>>>>> Signed-off-by: MD Danish Anwar <danishanwar@...com>
>>>>> Reviewed-by: Roger Quadros <rogerq@...nel.org>
>>>>> ---
>>>>> drivers/soc/ti/pruss.c | 77 ++++++++++++++++++++++++++++++++
>>>>> include/linux/pruss_driver.h | 27 +++--------
>>>>> include/linux/remoteproc/pruss.h | 39 ++++++++++++++++
>>>>
>>>>
>>>> We have these 2 header files and I think anything that deals with
>>>> 'struct pruss' should go in include/linux/pruss_driver.h
>>>>
>>>> Anything that deals with pru_rproc (i.e. struct rproc) should go in
>>>> include/linux/remoteproc/pruss.h
>>>>
>>>> Do you agree?
>>>>
>>>
>>> I agree with you Roger but Andrew is the right person to comment here as he is
>>> the author of this and several other patches.
>>>
>>> Hi Andrew, Can you please comment on this?
>>>
>>
>> Original idea was a consumer driver (like "ICSSG Ethernet Driver" in your other
>> series) could just
>>
>> #include <linux/remoteproc/pruss.h>
>>
>> and get everything they need, and nothing they do not.
>>
>
> If we plan on continuing the original idea, then I think keeping the header
> files as it is will be the best. Because if we move anything that deals with
> 'struct pruss' to include/linux/pruss_driver.h and anything that deals with
> pru_rproc (i.e. struct rproc) to include/linux/remoteproc/pruss.h, then the
> consumer drivers will need to do,
>
> #include <linux/remoteproc/pruss.h>
> #include <linux/pruss_driver.h>
>
> Roger, should I keep the header files arrangement as it is?
>
OK but can we please rename one of them to something else so they don't
sound very similar. Maybe you could use Andrew's suggestion below.
>> pruss_driver.h (which could be renamed pruss_internal.h) exists to allow
>> comunication between the pruss core and the pru rproc driver which live
>> in different subsystems.
>>
>> Andrew
>>
>>>>> 3 files changed, 121 insertions(+), 22 deletions(-)
>>>>>
>>>>> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
>>>>> index a169aa1ed044..c8053c0d735f 100644
>>>>> --- a/drivers/soc/ti/pruss.c
>>>>> +++ b/drivers/soc/ti/pruss.c
>>>>> @@ -88,6 +88,82 @@ 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;
>>>>> @@ -290,6 +366,7 @@ 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 86242fb5a64a..22b4b37d2536 100644
>>>>> --- a/include/linux/pruss_driver.h
>>>>> +++ b/include/linux/pruss_driver.h
>>>>> @@ -9,37 +9,18 @@
>>>>> #ifndef _PRUSS_DRIVER_H_
>>>>> #define _PRUSS_DRIVER_H_
>>>>> +#include <linux/mutex.h>
>>>>> #include <linux/remoteproc/pruss.h>
>>>>> #include <linux/types.h>
>>>>> -/*
>>>>> - * enum pruss_mem - PRUSS memory range identifiers
>>>>> - */
>>>>> -enum pruss_mem {
>>>>> - PRUSS_MEM_DRAM0 = 0,
>>>>> - PRUSS_MEM_DRAM1,
>>>>> - PRUSS_MEM_SHRD_RAM2,
>>>>> - PRUSS_MEM_MAX,
>>>>> -};
>>>>> -
>>>>> -/**
>>>>> - * struct pruss_mem_region - PRUSS memory region structure
>>>>> - * @va: kernel virtual address of the PRUSS memory region
>>>>> - * @pa: physical (bus) address of the PRUSS memory region
>>>>> - * @size: size of the PRUSS memory region
>>>>> - */
>>>>> -struct pruss_mem_region {
>>>>> - void __iomem *va;
>>>>> - phys_addr_t pa;
>>>>> - size_t size;
>>>>> -};
>>>>> -
>>>>> /**
>>>>> * struct pruss - PRUSS parent structure
>>>>> * @dev: pruss device pointer
>>>>> * @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
>>>>> */
>>>>> @@ -48,6 +29,8 @@ 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;
>>>>> };
>>>>> diff --git a/include/linux/remoteproc/pruss.h
>>>>> b/include/linux/remoteproc/pruss.h
>>>>> index 93a98cac7829..33f930e0a0ce 100644
>>>>> --- a/include/linux/remoteproc/pruss.h
>>>>> +++ b/include/linux/remoteproc/pruss.h
>>>>> @@ -44,6 +44,28 @@ enum pru_ctable_idx {
>>>>> PRU_C31,
>>>>> };
>>>>> +/*
>>>>> + * enum pruss_mem - PRUSS memory range identifiers
>>>>> + */
>>>>> +enum pruss_mem {
>>>>> + PRUSS_MEM_DRAM0 = 0,
>>>>> + PRUSS_MEM_DRAM1,
>>>>> + PRUSS_MEM_SHRD_RAM2,
>>>>> + PRUSS_MEM_MAX,
>>>>> +};
>>>>> +
>>>>> +/**
>>>>> + * struct pruss_mem_region - PRUSS memory region structure
>>>>> + * @va: kernel virtual address of the PRUSS memory region
>>>>> + * @pa: physical (bus) address of the PRUSS memory region
>>>>> + * @size: size of the PRUSS memory region
>>>>> + */
>>>>> +struct pruss_mem_region {
>>>>> + void __iomem *va;
>>>>> + phys_addr_t pa;
>>>>> + size_t size;
>>>>> +};
>>>>> +
>>>>> struct device_node;
>>>>> struct rproc;
>>>>> struct pruss;
>>>>> @@ -52,6 +74,10 @@ 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
>>>>> @@ -62,6 +88,19 @@ 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 */
>>>>> #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
>>>>
>>>> cheers,
>>>> -roger
>>>
>
cheers,
-roger
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