| Message ID | 20221207110411.441692-4-danishanwar@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce PRU remoteproc consumer API | expand |
Hi, On 07/12/2022 13:04, MD Danish Anwar wrote: > Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU > driver to allow client drivers to acquire and release the remoteproc > device associated with a PRU core. The PRU cores are treated as > resources with only one client owning it at a time. > > The pru_rproc_get() function returns the rproc handle corresponding > to a PRU core identified by the device tree "ti,prus" property under > the client node. The pru_rproc_put() is the complementary function > to pru_rproc_get(). > > Signed-off-by: Suman Anna <s-anna@ti.com> > Signed-off-by: Tero Kristo <t-kristo@ti.com> > Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > Signed-off-by: MD Danish Anwar <danishanwar@ti.com> > --- > drivers/remoteproc/pru_rproc.c | 133 ++++++++++++++++++++++++++++++++- > include/linux/pruss.h | 29 +++++++ > 2 files changed, 160 insertions(+), 2 deletions(-) > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > index a1a208b31846..7d4ed39b3772 100644 > --- a/drivers/remoteproc/pru_rproc.c > +++ b/drivers/remoteproc/pru_rproc.c > @@ -2,12 +2,14 @@ > /* > * PRU-ICSS remoteproc driver for various TI SoCs > * > - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ > + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/ > * > * Author(s): > * Suman Anna <s-anna@ti.com> > * Andrew F. Davis <afd@ti.com> > * Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments > + * Puranjay Mohan <p-mohan@ti.com> > + * Md Danish Anwar <danishanwar@ti.com> > */ > > #include <linux/bitops.h> > @@ -112,6 +114,8 @@ struct pru_private_data { > * @rproc: remoteproc pointer for this PRU core > * @data: PRU core specific data > * @mem_regions: data for each of the PRU memory regions > + * @client_np: client device node > + * @lock: mutex to protect client usage > * @fw_name: name of firmware image used during loading > * @mapped_irq: virtual interrupt numbers of created fw specific mapping > * @pru_interrupt_map: pointer to interrupt mapping description (firmware) > @@ -127,6 +131,8 @@ struct pru_rproc { > struct rproc *rproc; > const struct pru_private_data *data; > struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; > + struct device_node *client_np; > + struct mutex lock; > const char *fw_name; > unsigned int *mapped_irq; > struct pru_irq_rsc *pru_interrupt_map; > @@ -147,6 +153,125 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) > writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); > } > > +static struct rproc *__pru_rproc_get(struct device_node *np, int index) > +{ > + struct rproc *rproc; > + phandle rproc_phandle; > + int ret; > + > + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle); > + if (ret) > + return ERR_PTR(ret); > + > + rproc = rproc_get_by_phandle(rproc_phandle); > + if (!rproc) { > + ret = -EPROBE_DEFER; > + goto err_no_rproc_handle; > + } > + > + /* make sure it is PRU rproc */ > + if (!is_pru_rproc(rproc->dev.parent)) { > + rproc_put(rproc); > + return ERR_PTR(-ENODEV); > + } > + > + return rproc; > + > +err_no_rproc_handle: > + rproc_put(rproc); > + return ERR_PTR(ret); > +} > + > +/** > + * pru_rproc_get() - get the PRU rproc instance from a device node > + * @np: the user/client device node > + * @index: index to use for the ti,prus property > + * @pru_id: optional pointer to return the PRU remoteproc processor id > + * > + * This function looks through a client device node's "ti,prus" property at > + * index @index and returns the rproc handle for a valid PRU remote processor if > + * found. The function allows only one user to own the PRU rproc resource at a > + * time. Caller must call pru_rproc_put() when done with using the rproc, not > + * required if the function returns a failure. > + * > + * When optional @pru_id pointer is passed the PRU remoteproc processor id is > + * returned. > + * > + * Return: rproc handle on success, and an ERR_PTR on failure using one > + * of the following error values > + * -ENODEV if device is not found > + * -EBUSY if PRU is already acquired by anyone > + * -EPROBE_DEFER is PRU device is not probed yet > + */ > +struct rproc *pru_rproc_get(struct device_node *np, int index, > + enum pruss_pru_id *pru_id) > +{ > + struct rproc *rproc; > + struct pru_rproc *pru; > + struct device *dev; > + int ret; > + > + rproc = __pru_rproc_get(np, index); > + if (IS_ERR(rproc)) > + return rproc; > + > + pru = rproc->priv; > + dev = &rproc->dev; > + > + mutex_lock(&pru->lock); > + > + if (pru->client_np) { > + mutex_unlock(&pru->lock); > + put_device(dev); Is this put_device() to counter balance the get_device() you had earlier? Is it still needed? Did we do the right thing by getting rid of the additional get_device()? I didn't see a reason for it. > + ret = -EBUSY; > + goto err_no_rproc_handle; > + } > + > + pru->client_np = np; > + > + mutex_unlock(&pru->lock); > + > + if (pru_id) > + *pru_id = pru->id; > + > + return rproc; > + > +err_no_rproc_handle: > + rproc_put(rproc); > + return ERR_PTR(ret); > +} > +EXPORT_SYMBOL_GPL(pru_rproc_get); > + > +/** > + * pru_rproc_put() - release the PRU rproc resource > + * @rproc: the rproc resource to release > + * > + * Releases the PRU rproc resource and makes it available to other > + * users. > + */ > +void pru_rproc_put(struct rproc *rproc) > +{ > + struct pru_rproc *pru; > + > + if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent)) > + return; > + > + pru = rproc->priv; > + > + mutex_lock(&pru->lock); > + > + if (!pru->client_np) { > + mutex_unlock(&pru->lock); > + return; > + } > + > + pru->client_np = NULL; > + mutex_unlock(&pru->lock); > + > + rproc_put(rproc); > +} > +EXPORT_SYMBOL_GPL(pru_rproc_put); > + > static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg) > { > return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg); > @@ -817,6 +942,8 @@ static int pru_rproc_probe(struct platform_device *pdev) > pru->pruss = platform_get_drvdata(ppdev); > pru->rproc = rproc; > pru->fw_name = fw_name; > + pru->client_np = NULL; > + mutex_init(&pru->lock); > > for (i = 0; i < ARRAY_SIZE(mem_names); i++) { > res = platform_get_resource_byname(pdev, IORESOURCE_MEM, > @@ -905,7 +1032,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match); > > static struct platform_driver pru_rproc_driver = { > .driver = { > - .name = "pru-rproc", > + .name = PRU_RPROC_DRVNAME, > .of_match_table = pru_rproc_match, > .suppress_bind_attrs = true, > }, > @@ -917,5 +1044,7 @@ module_platform_driver(pru_rproc_driver); > MODULE_AUTHOR("Suman Anna <s-anna@ti.com>"); > MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); > MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>"); > +MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>"); > +MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>"); > MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver"); > MODULE_LICENSE("GPL v2"); > diff --git a/include/linux/pruss.h b/include/linux/pruss.h > index fbe4fbb45807..6ea737e995e9 100644 > --- a/include/linux/pruss.h > +++ b/include/linux/pruss.h > @@ -28,5 +28,34 @@ enum pruss_pru_id { > PRUSS_NUM_PRUS, > }; > > +struct device_node; > + > +#if IS_ENABLED(CONFIG_PRU_REMOTEPROC) > + > +struct rproc *pru_rproc_get(struct device_node *np, int index, > + enum pruss_pru_id *pru_id); > +void pru_rproc_put(struct rproc *rproc); > + > +#else > + > +static inline struct rproc * > +pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id) > +{ > + return ERR_PTR(-EOPNOTSUPP); > +} > + > +static inline void pru_rproc_put(struct rproc *rproc) { } > + > +#endif /* CONFIG_PRU_REMOTEPROC */ > + > +static inline bool is_pru_rproc(struct device *dev) > +{ > + const char *drv_name = dev_driver_string(dev); > + > + if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME))) > + return false; > + > + return true; > +} > > #endif /* __LINUX_PRUSS_H */ > \ No newline at end of file -- cheers, -roger
Hi Roger, On 08/12/22 16:05, Roger Quadros wrote: > Hi, > > On 07/12/2022 13:04, MD Danish Anwar wrote: >> Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU >> driver to allow client drivers to acquire and release the remoteproc >> device associated with a PRU core. The PRU cores are treated as >> resources with only one client owning it at a time. >> >> The pru_rproc_get() function returns the rproc handle corresponding >> to a PRU core identified by the device tree "ti,prus" property under >> the client node. The pru_rproc_put() is the complementary function >> to pru_rproc_get(). >> >> Signed-off-by: Suman Anna <s-anna@ti.com> >> Signed-off-by: Tero Kristo <t-kristo@ti.com> >> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> >> --- >> drivers/remoteproc/pru_rproc.c | 133 ++++++++++++++++++++++++++++++++- >> include/linux/pruss.h | 29 +++++++ >> 2 files changed, 160 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c >> index a1a208b31846..7d4ed39b3772 100644 >> --- a/drivers/remoteproc/pru_rproc.c >> +++ b/drivers/remoteproc/pru_rproc.c >> @@ -2,12 +2,14 @@ >> /* >> * PRU-ICSS remoteproc driver for various TI SoCs >> * >> - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ >> + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/ >> * >> * Author(s): >> * Suman Anna <s-anna@ti.com> >> * Andrew F. Davis <afd@ti.com> >> * Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments >> + * Puranjay Mohan <p-mohan@ti.com> >> + * Md Danish Anwar <danishanwar@ti.com> >> */ >> >> #include <linux/bitops.h> >> @@ -112,6 +114,8 @@ struct pru_private_data { >> * @rproc: remoteproc pointer for this PRU core >> * @data: PRU core specific data >> * @mem_regions: data for each of the PRU memory regions >> + * @client_np: client device node >> + * @lock: mutex to protect client usage >> * @fw_name: name of firmware image used during loading >> * @mapped_irq: virtual interrupt numbers of created fw specific mapping >> * @pru_interrupt_map: pointer to interrupt mapping description (firmware) >> @@ -127,6 +131,8 @@ struct pru_rproc { >> struct rproc *rproc; >> const struct pru_private_data *data; >> struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; >> + struct device_node *client_np; >> + struct mutex lock; >> const char *fw_name; >> unsigned int *mapped_irq; >> struct pru_irq_rsc *pru_interrupt_map; >> @@ -147,6 +153,125 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) >> writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); >> } >> >> +static struct rproc *__pru_rproc_get(struct device_node *np, int index) >> +{ >> + struct rproc *rproc; >> + phandle rproc_phandle; >> + int ret; >> + >> + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle); >> + if (ret) >> + return ERR_PTR(ret); >> + >> + rproc = rproc_get_by_phandle(rproc_phandle); >> + if (!rproc) { >> + ret = -EPROBE_DEFER; >> + goto err_no_rproc_handle; >> + } >> + >> + /* make sure it is PRU rproc */ >> + if (!is_pru_rproc(rproc->dev.parent)) { >> + rproc_put(rproc); >> + return ERR_PTR(-ENODEV); >> + } >> + >> + return rproc; >> + >> +err_no_rproc_handle: >> + rproc_put(rproc); >> + return ERR_PTR(ret); >> +} >> + >> +/** >> + * pru_rproc_get() - get the PRU rproc instance from a device node >> + * @np: the user/client device node >> + * @index: index to use for the ti,prus property >> + * @pru_id: optional pointer to return the PRU remoteproc processor id >> + * >> + * This function looks through a client device node's "ti,prus" property at >> + * index @index and returns the rproc handle for a valid PRU remote processor if >> + * found. The function allows only one user to own the PRU rproc resource at a >> + * time. Caller must call pru_rproc_put() when done with using the rproc, not >> + * required if the function returns a failure. >> + * >> + * When optional @pru_id pointer is passed the PRU remoteproc processor id is >> + * returned. >> + * >> + * Return: rproc handle on success, and an ERR_PTR on failure using one >> + * of the following error values >> + * -ENODEV if device is not found >> + * -EBUSY if PRU is already acquired by anyone >> + * -EPROBE_DEFER is PRU device is not probed yet >> + */ >> +struct rproc *pru_rproc_get(struct device_node *np, int index, >> + enum pruss_pru_id *pru_id) >> +{ >> + struct rproc *rproc; >> + struct pru_rproc *pru; >> + struct device *dev; >> + int ret; >> + >> + rproc = __pru_rproc_get(np, index); >> + if (IS_ERR(rproc)) >> + return rproc; >> + >> + pru = rproc->priv; >> + dev = &rproc->dev; >> + >> + mutex_lock(&pru->lock); >> + >> + if (pru->client_np) { >> + mutex_unlock(&pru->lock); >> + put_device(dev); > > Is this put_device() to counter balance the get_device() you had earlier? > Is it still needed? >> Did we do the right thing by getting rid of the additional get_device()? > I didn't see a reason for it. > The previous get_device() in __pru_rproc_get() was additional/not required as the same get_device() was called by rproc_get_by_phandle() API before it's completion. So that get_device() is not needed. The put_device() here is to counter the get_device() called by rproc_get_by_phandle() in the API __pru_rproc_get(). So I think, this put_device() is still needed. >> + ret = -EBUSY; >> + goto err_no_rproc_handle; >> + } >> + >> + pru->client_np = np; >> + >> + mutex_unlock(&pru->lock); >> + >> + if (pru_id) >> + *pru_id = pru->id; >> + >> + return rproc; >> + >> +err_no_rproc_handle: >> + rproc_put(rproc); >> + return ERR_PTR(ret); >> +} >> +EXPORT_SYMBOL_GPL(pru_rproc_get); >> + >> +/** >> + * pru_rproc_put() - release the PRU rproc resource >> + * @rproc: the rproc resource to release >> + * >> + * Releases the PRU rproc resource and makes it available to other >> + * users. >> + */ >> +void pru_rproc_put(struct rproc *rproc) >> +{ >> + struct pru_rproc *pru; >> + >> + if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent)) >> + return; >> + >> + pru = rproc->priv; >> + >> + mutex_lock(&pru->lock); >> + >> + if (!pru->client_np) { >> + mutex_unlock(&pru->lock); >> + return; >> + } >> + >> + pru->client_np = NULL; >> + mutex_unlock(&pru->lock); >> + >> + rproc_put(rproc); >> +} >> +EXPORT_SYMBOL_GPL(pru_rproc_put); >> + >> static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg) >> { >> return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg); >> @@ -817,6 +942,8 @@ static int pru_rproc_probe(struct platform_device *pdev) >> pru->pruss = platform_get_drvdata(ppdev); >> pru->rproc = rproc; >> pru->fw_name = fw_name; >> + pru->client_np = NULL; >> + mutex_init(&pru->lock); >> >> for (i = 0; i < ARRAY_SIZE(mem_names); i++) { >> res = platform_get_resource_byname(pdev, IORESOURCE_MEM, >> @@ -905,7 +1032,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match); >> >> static struct platform_driver pru_rproc_driver = { >> .driver = { >> - .name = "pru-rproc", >> + .name = PRU_RPROC_DRVNAME, >> .of_match_table = pru_rproc_match, >> .suppress_bind_attrs = true, >> }, >> @@ -917,5 +1044,7 @@ module_platform_driver(pru_rproc_driver); >> MODULE_AUTHOR("Suman Anna <s-anna@ti.com>"); >> MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); >> MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>"); >> +MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>"); >> +MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>"); >> MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver"); >> MODULE_LICENSE("GPL v2"); >> diff --git a/include/linux/pruss.h b/include/linux/pruss.h >> index fbe4fbb45807..6ea737e995e9 100644 >> --- a/include/linux/pruss.h >> +++ b/include/linux/pruss.h >> @@ -28,5 +28,34 @@ enum pruss_pru_id { >> PRUSS_NUM_PRUS, >> }; >> >> +struct device_node; >> + >> +#if IS_ENABLED(CONFIG_PRU_REMOTEPROC) >> + >> +struct rproc *pru_rproc_get(struct device_node *np, int index, >> + enum pruss_pru_id *pru_id); >> +void pru_rproc_put(struct rproc *rproc); >> + >> +#else >> + >> +static inline struct rproc * >> +pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id) >> +{ >> + return ERR_PTR(-EOPNOTSUPP); >> +} >> + >> +static inline void pru_rproc_put(struct rproc *rproc) { } >> + >> +#endif /* CONFIG_PRU_REMOTEPROC */ >> + >> +static inline bool is_pru_rproc(struct device *dev) >> +{ >> + const char *drv_name = dev_driver_string(dev); >> + >> + if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME))) >> + return false; >> + >> + return true; >> +} >> >> #endif /* __LINUX_PRUSS_H */ >> \ No newline at end of file > > -- > cheers, > -roger Thanks, Danish
Danish, On 09/12/2022 06:55, Md Danish Anwar wrote: > Hi Roger, > > On 08/12/22 16:05, Roger Quadros wrote: >> Hi, >> >> On 07/12/2022 13:04, MD Danish Anwar wrote: >>> Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU >>> driver to allow client drivers to acquire and release the remoteproc >>> device associated with a PRU core. The PRU cores are treated as >>> resources with only one client owning it at a time. >>> >>> The pru_rproc_get() function returns the rproc handle corresponding >>> to a PRU core identified by the device tree "ti,prus" property under >>> the client node. The pru_rproc_put() is the complementary function >>> to pru_rproc_get(). >>> >>> Signed-off-by: Suman Anna <s-anna@ti.com> >>> Signed-off-by: Tero Kristo <t-kristo@ti.com> >>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >>> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> >>> --- >>> drivers/remoteproc/pru_rproc.c | 133 ++++++++++++++++++++++++++++++++- >>> include/linux/pruss.h | 29 +++++++ >>> 2 files changed, 160 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c >>> index a1a208b31846..7d4ed39b3772 100644 >>> --- a/drivers/remoteproc/pru_rproc.c >>> +++ b/drivers/remoteproc/pru_rproc.c >>> @@ -2,12 +2,14 @@ >>> /* >>> * PRU-ICSS remoteproc driver for various TI SoCs >>> * >>> - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ >>> + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/ >>> * >>> * Author(s): >>> * Suman Anna <s-anna@ti.com> >>> * Andrew F. Davis <afd@ti.com> >>> * Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments >>> + * Puranjay Mohan <p-mohan@ti.com> >>> + * Md Danish Anwar <danishanwar@ti.com> >>> */ >>> >>> #include <linux/bitops.h> >>> @@ -112,6 +114,8 @@ struct pru_private_data { >>> * @rproc: remoteproc pointer for this PRU core >>> * @data: PRU core specific data >>> * @mem_regions: data for each of the PRU memory regions >>> + * @client_np: client device node >>> + * @lock: mutex to protect client usage >>> * @fw_name: name of firmware image used during loading >>> * @mapped_irq: virtual interrupt numbers of created fw specific mapping >>> * @pru_interrupt_map: pointer to interrupt mapping description (firmware) >>> @@ -127,6 +131,8 @@ struct pru_rproc { >>> struct rproc *rproc; >>> const struct pru_private_data *data; >>> struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; >>> + struct device_node *client_np; >>> + struct mutex lock; >>> const char *fw_name; >>> unsigned int *mapped_irq; >>> struct pru_irq_rsc *pru_interrupt_map; >>> @@ -147,6 +153,125 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) >>> writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); >>> } >>> >>> +static struct rproc *__pru_rproc_get(struct device_node *np, int index) >>> +{ >>> + struct rproc *rproc; >>> + phandle rproc_phandle; >>> + int ret; >>> + >>> + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle); >>> + if (ret) >>> + return ERR_PTR(ret); >>> + >>> + rproc = rproc_get_by_phandle(rproc_phandle); >>> + if (!rproc) { >>> + ret = -EPROBE_DEFER; >>> + goto err_no_rproc_handle; >>> + } >>> + >>> + /* make sure it is PRU rproc */ >>> + if (!is_pru_rproc(rproc->dev.parent)) { >>> + rproc_put(rproc); >>> + return ERR_PTR(-ENODEV); >>> + } >>> + >>> + return rproc; >>> + >>> +err_no_rproc_handle: >>> + rproc_put(rproc); >>> + return ERR_PTR(ret); >>> +} >>> + >>> +/** >>> + * pru_rproc_get() - get the PRU rproc instance from a device node >>> + * @np: the user/client device node >>> + * @index: index to use for the ti,prus property >>> + * @pru_id: optional pointer to return the PRU remoteproc processor id >>> + * >>> + * This function looks through a client device node's "ti,prus" property at >>> + * index @index and returns the rproc handle for a valid PRU remote processor if >>> + * found. The function allows only one user to own the PRU rproc resource at a >>> + * time. Caller must call pru_rproc_put() when done with using the rproc, not >>> + * required if the function returns a failure. >>> + * >>> + * When optional @pru_id pointer is passed the PRU remoteproc processor id is >>> + * returned. >>> + * >>> + * Return: rproc handle on success, and an ERR_PTR on failure using one >>> + * of the following error values >>> + * -ENODEV if device is not found >>> + * -EBUSY if PRU is already acquired by anyone >>> + * -EPROBE_DEFER is PRU device is not probed yet >>> + */ >>> +struct rproc *pru_rproc_get(struct device_node *np, int index, >>> + enum pruss_pru_id *pru_id) >>> +{ >>> + struct rproc *rproc; >>> + struct pru_rproc *pru; >>> + struct device *dev; >>> + int ret; >>> + >>> + rproc = __pru_rproc_get(np, index); >>> + if (IS_ERR(rproc)) >>> + return rproc; >>> + >>> + pru = rproc->priv; >>> + dev = &rproc->dev; >>> + >>> + mutex_lock(&pru->lock); >>> + >>> + if (pru->client_np) { >>> + mutex_unlock(&pru->lock); >>> + put_device(dev); >> >> Is this put_device() to counter balance the get_device() you had earlier? >> Is it still needed? >>> Did we do the right thing by getting rid of the additional get_device()? >> I didn't see a reason for it. >> > > The previous get_device() in __pru_rproc_get() was additional/not required as > the same get_device() was called by rproc_get_by_phandle() API before it's > completion. > > So that get_device() is not needed. > > The put_device() here is to counter the get_device() called by > rproc_get_by_phandle() in the API __pru_rproc_get(). > > So I think, this put_device() is still needed. But at the end of this function we are calling rproc_put() which also does a put_device(), right? > >>> + ret = -EBUSY; >>> + goto err_no_rproc_handle; >>> + } >>> + >>> + pru->client_np = np; >>> + >>> + mutex_unlock(&pru->lock); >>> + >>> + if (pru_id) >>> + *pru_id = pru->id; >>> + >>> + return rproc; >>> + >>> +err_no_rproc_handle: >>> + rproc_put(rproc); >>> + return ERR_PTR(ret); >>> +} >>> +EXPORT_SYMBOL_GPL(pru_rproc_get); <snip> cheers, -roger
Hi Roger, On 12/12/22 14:47, Roger Quadros wrote: > Danish, > > On 09/12/2022 06:55, Md Danish Anwar wrote: >> Hi Roger, >> >> On 08/12/22 16:05, Roger Quadros wrote: >>> Hi, >>> >>> On 07/12/2022 13:04, MD Danish Anwar wrote: >>>> Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU >>>> driver to allow client drivers to acquire and release the remoteproc >>>> device associated with a PRU core. The PRU cores are treated as >>>> resources with only one client owning it at a time. >>>> >>>> The pru_rproc_get() function returns the rproc handle corresponding >>>> to a PRU core identified by the device tree "ti,prus" property under >>>> the client node. The pru_rproc_put() is the complementary function >>>> to pru_rproc_get(). >>>> >>>> Signed-off-by: Suman Anna <s-anna@ti.com> >>>> Signed-off-by: Tero Kristo <t-kristo@ti.com> >>>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >>>> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> >>>> --- >>>> drivers/remoteproc/pru_rproc.c | 133 ++++++++++++++++++++++++++++++++- >>>> include/linux/pruss.h | 29 +++++++ >>>> 2 files changed, 160 insertions(+), 2 deletions(-) >>>> >>>> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c >>>> index a1a208b31846..7d4ed39b3772 100644 >>>> --- a/drivers/remoteproc/pru_rproc.c >>>> +++ b/drivers/remoteproc/pru_rproc.c >>>> @@ -2,12 +2,14 @@ >>>> /* >>>> * PRU-ICSS remoteproc driver for various TI SoCs >>>> * >>>> - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ >>>> + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/ >>>> * >>>> * Author(s): >>>> * Suman Anna <s-anna@ti.com> >>>> * Andrew F. Davis <afd@ti.com> >>>> * Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments >>>> + * Puranjay Mohan <p-mohan@ti.com> >>>> + * Md Danish Anwar <danishanwar@ti.com> >>>> */ >>>> >>>> #include <linux/bitops.h> >>>> @@ -112,6 +114,8 @@ struct pru_private_data { >>>> * @rproc: remoteproc pointer for this PRU core >>>> * @data: PRU core specific data >>>> * @mem_regions: data for each of the PRU memory regions >>>> + * @client_np: client device node >>>> + * @lock: mutex to protect client usage >>>> * @fw_name: name of firmware image used during loading >>>> * @mapped_irq: virtual interrupt numbers of created fw specific mapping >>>> * @pru_interrupt_map: pointer to interrupt mapping description (firmware) >>>> @@ -127,6 +131,8 @@ struct pru_rproc { >>>> struct rproc *rproc; >>>> const struct pru_private_data *data; >>>> struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; >>>> + struct device_node *client_np; >>>> + struct mutex lock; >>>> const char *fw_name; >>>> unsigned int *mapped_irq; >>>> struct pru_irq_rsc *pru_interrupt_map; >>>> @@ -147,6 +153,125 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) >>>> writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); >>>> } >>>> >>>> +static struct rproc *__pru_rproc_get(struct device_node *np, int index) >>>> +{ >>>> + struct rproc *rproc; >>>> + phandle rproc_phandle; >>>> + int ret; >>>> + >>>> + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle); >>>> + if (ret) >>>> + return ERR_PTR(ret); >>>> + >>>> + rproc = rproc_get_by_phandle(rproc_phandle); >>>> + if (!rproc) { >>>> + ret = -EPROBE_DEFER; >>>> + goto err_no_rproc_handle; >>>> + } >>>> + >>>> + /* make sure it is PRU rproc */ >>>> + if (!is_pru_rproc(rproc->dev.parent)) { >>>> + rproc_put(rproc); >>>> + return ERR_PTR(-ENODEV); >>>> + } >>>> + >>>> + return rproc; >>>> + >>>> +err_no_rproc_handle: >>>> + rproc_put(rproc); >>>> + return ERR_PTR(ret); >>>> +} >>>> + >>>> +/** >>>> + * pru_rproc_get() - get the PRU rproc instance from a device node >>>> + * @np: the user/client device node >>>> + * @index: index to use for the ti,prus property >>>> + * @pru_id: optional pointer to return the PRU remoteproc processor id >>>> + * >>>> + * This function looks through a client device node's "ti,prus" property at >>>> + * index @index and returns the rproc handle for a valid PRU remote processor if >>>> + * found. The function allows only one user to own the PRU rproc resource at a >>>> + * time. Caller must call pru_rproc_put() when done with using the rproc, not >>>> + * required if the function returns a failure. >>>> + * >>>> + * When optional @pru_id pointer is passed the PRU remoteproc processor id is >>>> + * returned. >>>> + * >>>> + * Return: rproc handle on success, and an ERR_PTR on failure using one >>>> + * of the following error values >>>> + * -ENODEV if device is not found >>>> + * -EBUSY if PRU is already acquired by anyone >>>> + * -EPROBE_DEFER is PRU device is not probed yet >>>> + */ >>>> +struct rproc *pru_rproc_get(struct device_node *np, int index, >>>> + enum pruss_pru_id *pru_id) >>>> +{ >>>> + struct rproc *rproc; >>>> + struct pru_rproc *pru; >>>> + struct device *dev; >>>> + int ret; >>>> + >>>> + rproc = __pru_rproc_get(np, index); >>>> + if (IS_ERR(rproc)) >>>> + return rproc; >>>> + >>>> + pru = rproc->priv; >>>> + dev = &rproc->dev; >>>> + >>>> + mutex_lock(&pru->lock); >>>> + >>>> + if (pru->client_np) { >>>> + mutex_unlock(&pru->lock); >>>> + put_device(dev); >>> >>> Is this put_device() to counter balance the get_device() you had earlier? >>> Is it still needed? >>>> Did we do the right thing by getting rid of the additional get_device()? >>> I didn't see a reason for it. >>> >> >> The previous get_device() in __pru_rproc_get() was additional/not required as >> the same get_device() was called by rproc_get_by_phandle() API before it's >> completion. >> >> So that get_device() is not needed. >> >> The put_device() here is to counter the get_device() called by >> rproc_get_by_phandle() in the API __pru_rproc_get(). >> >> So I think, this put_device() is still needed. > > But at the end of this function we are calling rproc_put() > which also does a put_device(), right? > Yes, from here we are going to the label err_no_rproc_handle where rproc_put() API is called. Which is further calling put_device(). So essentially we are doing two put device instead of one. So I think, I should remove the put_device() from the below if block if (pru->client_np) { mutex_unlock(&pru->lock); put_device(dev); ret = -EBUSY; goto err_no_rproc_handle; } >> >>>> + ret = -EBUSY; >>>> + goto err_no_rproc_handle; >>>> + } >>>> + >>>> + pru->client_np = np; >>>> + >>>> + mutex_unlock(&pru->lock); >>>> + >>>> + if (pru_id) >>>> + *pru_id = pru->id; >>>> + >>>> + return rproc; >>>> + >>>> +err_no_rproc_handle: >>>> + rproc_put(rproc); >>>> + return ERR_PTR(ret); >>>> +} >>>> +EXPORT_SYMBOL_GPL(pru_rproc_get); > > <snip> > > cheers, > -roger
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index a1a208b31846..7d4ed39b3772 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -2,12 +2,14 @@ /* * PRU-ICSS remoteproc driver for various TI SoCs * - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/ + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/ * * Author(s): * Suman Anna <s-anna@ti.com> * Andrew F. Davis <afd@ti.com> * Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments + * Puranjay Mohan <p-mohan@ti.com> + * Md Danish Anwar <danishanwar@ti.com> */ #include <linux/bitops.h> @@ -112,6 +114,8 @@ struct pru_private_data { * @rproc: remoteproc pointer for this PRU core * @data: PRU core specific data * @mem_regions: data for each of the PRU memory regions + * @client_np: client device node + * @lock: mutex to protect client usage * @fw_name: name of firmware image used during loading * @mapped_irq: virtual interrupt numbers of created fw specific mapping * @pru_interrupt_map: pointer to interrupt mapping description (firmware) @@ -127,6 +131,8 @@ struct pru_rproc { struct rproc *rproc; const struct pru_private_data *data; struct pruss_mem_region mem_regions[PRU_IOMEM_MAX]; + struct device_node *client_np; + struct mutex lock; const char *fw_name; unsigned int *mapped_irq; struct pru_irq_rsc *pru_interrupt_map; @@ -147,6 +153,125 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val) writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg); } +static struct rproc *__pru_rproc_get(struct device_node *np, int index) +{ + struct rproc *rproc; + phandle rproc_phandle; + int ret; + + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle); + if (ret) + return ERR_PTR(ret); + + rproc = rproc_get_by_phandle(rproc_phandle); + if (!rproc) { + ret = -EPROBE_DEFER; + goto err_no_rproc_handle; + } + + /* make sure it is PRU rproc */ + if (!is_pru_rproc(rproc->dev.parent)) { + rproc_put(rproc); + return ERR_PTR(-ENODEV); + } + + return rproc; + +err_no_rproc_handle: + rproc_put(rproc); + return ERR_PTR(ret); +} + +/** + * pru_rproc_get() - get the PRU rproc instance from a device node + * @np: the user/client device node + * @index: index to use for the ti,prus property + * @pru_id: optional pointer to return the PRU remoteproc processor id + * + * This function looks through a client device node's "ti,prus" property at + * index @index and returns the rproc handle for a valid PRU remote processor if + * found. The function allows only one user to own the PRU rproc resource at a + * time. Caller must call pru_rproc_put() when done with using the rproc, not + * required if the function returns a failure. + * + * When optional @pru_id pointer is passed the PRU remoteproc processor id is + * returned. + * + * Return: rproc handle on success, and an ERR_PTR on failure using one + * of the following error values + * -ENODEV if device is not found + * -EBUSY if PRU is already acquired by anyone + * -EPROBE_DEFER is PRU device is not probed yet + */ +struct rproc *pru_rproc_get(struct device_node *np, int index, + enum pruss_pru_id *pru_id) +{ + struct rproc *rproc; + struct pru_rproc *pru; + struct device *dev; + int ret; + + rproc = __pru_rproc_get(np, index); + if (IS_ERR(rproc)) + return rproc; + + pru = rproc->priv; + dev = &rproc->dev; + + mutex_lock(&pru->lock); + + if (pru->client_np) { + mutex_unlock(&pru->lock); + put_device(dev); + ret = -EBUSY; + goto err_no_rproc_handle; + } + + pru->client_np = np; + + mutex_unlock(&pru->lock); + + if (pru_id) + *pru_id = pru->id; + + return rproc; + +err_no_rproc_handle: + rproc_put(rproc); + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(pru_rproc_get); + +/** + * pru_rproc_put() - release the PRU rproc resource + * @rproc: the rproc resource to release + * + * Releases the PRU rproc resource and makes it available to other + * users. + */ +void pru_rproc_put(struct rproc *rproc) +{ + struct pru_rproc *pru; + + if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent)) + return; + + pru = rproc->priv; + + mutex_lock(&pru->lock); + + if (!pru->client_np) { + mutex_unlock(&pru->lock); + return; + } + + pru->client_np = NULL; + mutex_unlock(&pru->lock); + + rproc_put(rproc); +} +EXPORT_SYMBOL_GPL(pru_rproc_put); + static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg) { return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg); @@ -817,6 +942,8 @@ static int pru_rproc_probe(struct platform_device *pdev) pru->pruss = platform_get_drvdata(ppdev); pru->rproc = rproc; pru->fw_name = fw_name; + pru->client_np = NULL; + mutex_init(&pru->lock); for (i = 0; i < ARRAY_SIZE(mem_names); i++) { res = platform_get_resource_byname(pdev, IORESOURCE_MEM, @@ -905,7 +1032,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match); static struct platform_driver pru_rproc_driver = { .driver = { - .name = "pru-rproc", + .name = PRU_RPROC_DRVNAME, .of_match_table = pru_rproc_match, .suppress_bind_attrs = true, }, @@ -917,5 +1044,7 @@ module_platform_driver(pru_rproc_driver); MODULE_AUTHOR("Suman Anna <s-anna@ti.com>"); MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>"); MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>"); +MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>"); +MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>"); MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver"); MODULE_LICENSE("GPL v2"); diff --git a/include/linux/pruss.h b/include/linux/pruss.h index fbe4fbb45807..6ea737e995e9 100644 --- a/include/linux/pruss.h +++ b/include/linux/pruss.h @@ -28,5 +28,34 @@ enum pruss_pru_id { PRUSS_NUM_PRUS, }; +struct device_node; + +#if IS_ENABLED(CONFIG_PRU_REMOTEPROC) + +struct rproc *pru_rproc_get(struct device_node *np, int index, + enum pruss_pru_id *pru_id); +void pru_rproc_put(struct rproc *rproc); + +#else + +static inline struct rproc * +pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id) +{ + return ERR_PTR(-EOPNOTSUPP); +} + +static inline void pru_rproc_put(struct rproc *rproc) { } + +#endif /* CONFIG_PRU_REMOTEPROC */ + +static inline bool is_pru_rproc(struct device *dev) +{ + const char *drv_name = dev_driver_string(dev); + + if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME))) + return false; + + return true; +} #endif /* __LINUX_PRUSS_H */ \ No newline at end of file