| Message ID | 20230323062451.2925996-2-danishanwar@ti.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Introduce PRU platform consumer API | expand |
Hi Danish On Thu, Mar 23, 2023 at 11:54:47AM +0530, MD Danish Anwar wrote: > From: Tero Kristo <t-kristo@ti.com> > > Add two new get and put API, pruss_get() and pruss_put() to the > PRUSS platform driver to allow client drivers to request a handle > to a PRUSS device. This handle will be used by client drivers to > request various operations of the PRUSS platform driver through > additional API that will be added in the following patches. > > The pruss_get() function returns the pruss handle corresponding > to a PRUSS device referenced by a PRU remoteproc instance. The > pruss_put() is the complimentary function to pruss_get(). > > Co-developed-by: Suman Anna <s-anna@ti.com> > Signed-off-by: Suman Anna <s-anna@ti.com> > Signed-off-by: Tero Kristo <t-kristo@ti.com> > Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > Signed-off-by: Puranjay Mohan <p-mohan@ti.com> > Signed-off-by: MD Danish Anwar <danishanwar@ti.com> > Reviewed-by: Roger Quadros <rogerq@kernel.org> > --- > drivers/remoteproc/pru_rproc.c | 2 +- > drivers/soc/ti/pruss.c | 60 ++++++++++++++++++- > .../{pruss_driver.h => pruss_internal.h} | 7 ++- > include/linux/remoteproc/pruss.h | 19 ++++++ > 4 files changed, 83 insertions(+), 5 deletions(-) > rename include/linux/{pruss_driver.h => pruss_internal.h} (90%) > > diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > index b76db7fa693d..4ddd5854d56e 100644 > --- a/drivers/remoteproc/pru_rproc.c > +++ b/drivers/remoteproc/pru_rproc.c > @@ -19,7 +19,7 @@ > #include <linux/of_device.h> > #include <linux/of_irq.h> > #include <linux/remoteproc/pruss.h> > -#include <linux/pruss_driver.h> > +#include <linux/pruss_internal.h> > #include <linux/remoteproc.h> > > #include "remoteproc_internal.h" > diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c > index 6882c86b3ce5..6c2bb02a521d 100644 > --- a/drivers/soc/ti/pruss.c > +++ b/drivers/soc/ti/pruss.c > @@ -6,6 +6,7 @@ > * Author(s): > * Suman Anna <s-anna@ti.com> > * Andrew F. Davis <afd@ti.com> > + * Tero Kristo <t-kristo@ti.com> > */ > > #include <linux/clk-provider.h> > @@ -16,8 +17,9 @@ > #include <linux/of_address.h> > #include <linux/of_device.h> > #include <linux/pm_runtime.h> > -#include <linux/pruss_driver.h> > +#include <linux/pruss_internal.h> > #include <linux/regmap.h> > +#include <linux/remoteproc.h> > #include <linux/slab.h> > > /** > @@ -30,6 +32,62 @@ struct pruss_private_data { > bool has_core_mux_clock; > }; > > +/** > + * pruss_get() - get the pruss for a given PRU remoteproc > + * @rproc: remoteproc handle of a PRU instance > + * > + * Finds the parent pruss device for a PRU given the @rproc handle of the > + * PRU remote processor. This function increments the pruss device's refcount, > + * so always use pruss_put() to decrement it back once pruss isn't needed > + * anymore. > + * > + * Return: pruss handle on success, and an ERR_PTR on failure using one > + * of the following error values > + * -EINVAL if invalid parameter > + * -ENODEV if PRU device or PRUSS device is not found > + */ > +struct pruss *pruss_get(struct rproc *rproc) > +{ > + struct pruss *pruss; > + struct device *dev; > + struct platform_device *ppdev; > + > + if (IS_ERR_OR_NULL(rproc)) > + return ERR_PTR(-EINVAL); > + There is no guarantee that @rproc is valid without calling rproc_get_by_handle() or pru_rproc_get(). > + dev = &rproc->dev; > + > + /* make sure it is PRU rproc */ > + if (!dev->parent || !is_pru_rproc(dev->parent)) > + return ERR_PTR(-ENODEV); > + > + ppdev = to_platform_device(dev->parent->parent); > + pruss = platform_get_drvdata(ppdev); > + if (!pruss) > + return ERR_PTR(-ENODEV); > + > + get_device(pruss->dev); > + > + return pruss; > +} > +EXPORT_SYMBOL_GPL(pruss_get); > + > +/** > + * pruss_put() - decrement pruss device's usecount > + * @pruss: pruss handle > + * > + * Complimentary function for pruss_get(). Needs to be called > + * after the PRUSS is used, and only if the pruss_get() succeeds. > + */ > +void pruss_put(struct pruss *pruss) > +{ > + if (IS_ERR_OR_NULL(pruss)) > + return; > + > + put_device(pruss->dev); > +} > +EXPORT_SYMBOL_GPL(pruss_put); > + > static void pruss_of_free_clk_provider(void *data) > { > struct device_node *clk_mux_np = data; > diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_internal.h > similarity index 90% > rename from include/linux/pruss_driver.h > rename to include/linux/pruss_internal.h > index ecfded30ed05..8f91cb164054 100644 > --- a/include/linux/pruss_driver.h > +++ b/include/linux/pruss_internal.h > @@ -6,9 +6,10 @@ > * Suman Anna <s-anna@ti.com> > */ > > -#ifndef _PRUSS_DRIVER_H_ > -#define _PRUSS_DRIVER_H_ > +#ifndef _PRUSS_INTERNAL_H_ > +#define _PRUSS_INTERNAL_H_ > > +#include <linux/remoteproc/pruss.h> > #include <linux/types.h> > > /* > @@ -51,4 +52,4 @@ struct pruss { > struct clk *iep_clk_mux; > }; > > -#endif /* _PRUSS_DRIVER_H_ */ > +#endif /* _PRUSS_INTERNAL_H_ */ > diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h > index 039b50d58df2..93a98cac7829 100644 > --- a/include/linux/remoteproc/pruss.h > +++ b/include/linux/remoteproc/pruss.h > @@ -4,12 +4,14 @@ > * > * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com > * Suman Anna <s-anna@ti.com> > + * Tero Kristo <t-kristo@ti.com> > */ > > #ifndef __LINUX_PRUSS_H > #define __LINUX_PRUSS_H > > #include <linux/device.h> > +#include <linux/err.h> > #include <linux/types.h> > > #define PRU_RPROC_DRVNAME "pru-rproc" > @@ -44,6 +46,23 @@ enum pru_ctable_idx { > > struct device_node; > struct rproc; > +struct pruss; > + > +#if IS_ENABLED(CONFIG_TI_PRUSS) > + > +struct pruss *pruss_get(struct rproc *rproc); > +void pruss_put(struct pruss *pruss); > + > +#else > + > +static inline struct pruss *pruss_get(struct rproc *rproc) > +{ > + return ERR_PTR(-EOPNOTSUPP); > +} > + > +static inline void pruss_put(struct pruss *pruss) { } > + > +#endif /* CONFIG_TI_PRUSS */ > > #if IS_ENABLED(CONFIG_PRU_REMOTEPROC) > > -- > 2.25.1 >
Hi Mathieu, On 28/03/23 02:28, Mathieu Poirier wrote: > Hi Danish > > On Thu, Mar 23, 2023 at 11:54:47AM +0530, MD Danish Anwar wrote: >> From: Tero Kristo <t-kristo@ti.com> >> >> Add two new get and put API, pruss_get() and pruss_put() to the >> PRUSS platform driver to allow client drivers to request a handle >> to a PRUSS device. This handle will be used by client drivers to >> request various operations of the PRUSS platform driver through >> additional API that will be added in the following patches. >> >> The pruss_get() function returns the pruss handle corresponding >> to a PRUSS device referenced by a PRU remoteproc instance. The >> pruss_put() is the complimentary function to pruss_get(). >> >> Co-developed-by: Suman Anna <s-anna@ti.com> >> Signed-off-by: Suman Anna <s-anna@ti.com> >> Signed-off-by: Tero Kristo <t-kristo@ti.com> >> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >> Signed-off-by: Puranjay Mohan <p-mohan@ti.com> >> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> >> Reviewed-by: Roger Quadros <rogerq@kernel.org> >> --- >> drivers/remoteproc/pru_rproc.c | 2 +- >> drivers/soc/ti/pruss.c | 60 ++++++++++++++++++- >> .../{pruss_driver.h => pruss_internal.h} | 7 ++- >> include/linux/remoteproc/pruss.h | 19 ++++++ >> 4 files changed, 83 insertions(+), 5 deletions(-) >> rename include/linux/{pruss_driver.h => pruss_internal.h} (90%) >> >> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c >> index b76db7fa693d..4ddd5854d56e 100644 >> --- a/drivers/remoteproc/pru_rproc.c >> +++ b/drivers/remoteproc/pru_rproc.c >> @@ -19,7 +19,7 @@ >> #include <linux/of_device.h> >> #include <linux/of_irq.h> >> #include <linux/remoteproc/pruss.h> >> -#include <linux/pruss_driver.h> >> +#include <linux/pruss_internal.h> >> #include <linux/remoteproc.h> >> >> #include "remoteproc_internal.h" >> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c >> index 6882c86b3ce5..6c2bb02a521d 100644 >> --- a/drivers/soc/ti/pruss.c >> +++ b/drivers/soc/ti/pruss.c >> @@ -6,6 +6,7 @@ >> * Author(s): >> * Suman Anna <s-anna@ti.com> >> * Andrew F. Davis <afd@ti.com> >> + * Tero Kristo <t-kristo@ti.com> >> */ >> >> #include <linux/clk-provider.h> >> @@ -16,8 +17,9 @@ >> #include <linux/of_address.h> >> #include <linux/of_device.h> >> #include <linux/pm_runtime.h> >> -#include <linux/pruss_driver.h> >> +#include <linux/pruss_internal.h> >> #include <linux/regmap.h> >> +#include <linux/remoteproc.h> >> #include <linux/slab.h> >> >> /** >> @@ -30,6 +32,62 @@ struct pruss_private_data { >> bool has_core_mux_clock; >> }; >> >> +/** >> + * pruss_get() - get the pruss for a given PRU remoteproc >> + * @rproc: remoteproc handle of a PRU instance >> + * >> + * Finds the parent pruss device for a PRU given the @rproc handle of the >> + * PRU remote processor. This function increments the pruss device's refcount, >> + * so always use pruss_put() to decrement it back once pruss isn't needed >> + * anymore. >> + * >> + * Return: pruss handle on success, and an ERR_PTR on failure using one >> + * of the following error values >> + * -EINVAL if invalid parameter >> + * -ENODEV if PRU device or PRUSS device is not found >> + */ >> +struct pruss *pruss_get(struct rproc *rproc) >> +{ >> + struct pruss *pruss; >> + struct device *dev; >> + struct platform_device *ppdev; >> + >> + if (IS_ERR_OR_NULL(rproc)) >> + return ERR_PTR(-EINVAL); >> + > > There is no guarantee that @rproc is valid without calling rproc_get_by_handle() > or pru_rproc_get(). > Here in this API, we are checking if rproc is NULL or not. Also we are checking is_pru_rproc() to make sure this rproc is pru-rproc only and not some other rproc. This API will be called from driver (icssg_prueth.c) which I'll post once this series is merged. In the driver we are doing, prueth->pru[slice] = pru_rproc_get(np, pru, &pruss_id); pruss = pruss_get(prueth->pru[slice]); So, before calling pruss_get() we are in fact calling pru_rproc_get() to make sure it's a valid rproc. I think in this API, these two checks (NULL check and is_pru_rproc) should be OK as the driver is already calling pru_rproc_get() before this API. The only way to get a "pru-rproc" is by calling pru_rproc_get(), now the check is_pru_rproc() will only be true if it is a "pru-rproc" implying pru_rproc_get() was called before calling this API. Please let me know if this is OK or if any change is required. >> + dev = &rproc->dev; >> + >> + /* make sure it is PRU rproc */ >> + if (!dev->parent || !is_pru_rproc(dev->parent)) >> + return ERR_PTR(-ENODEV); >> + >> + ppdev = to_platform_device(dev->parent->parent); >> + pruss = platform_get_drvdata(ppdev); >> + if (!pruss) >> + return ERR_PTR(-ENODEV); >> + >> + get_device(pruss->dev); >> + >> + return pruss; >> +} >> +EXPORT_SYMBOL_GPL(pruss_get); >> + >> +/** >> + * pruss_put() - decrement pruss device's usecount >> + * @pruss: pruss handle >> + * >> + * Complimentary function for pruss_get(). Needs to be called >> + * after the PRUSS is used, and only if the pruss_get() succeeds. >> + */ >> +void pruss_put(struct pruss *pruss) >> +{ >> + if (IS_ERR_OR_NULL(pruss)) >> + return; >> + >> + put_device(pruss->dev); >> +} >> +EXPORT_SYMBOL_GPL(pruss_put); >> + >> static void pruss_of_free_clk_provider(void *data) >> { >> struct device_node *clk_mux_np = data; >> diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_internal.h >> similarity index 90% >> rename from include/linux/pruss_driver.h >> rename to include/linux/pruss_internal.h >> index ecfded30ed05..8f91cb164054 100644 >> --- a/include/linux/pruss_driver.h >> +++ b/include/linux/pruss_internal.h >> @@ -6,9 +6,10 @@ >> * Suman Anna <s-anna@ti.com> >> */ >> >> -#ifndef _PRUSS_DRIVER_H_ >> -#define _PRUSS_DRIVER_H_ >> +#ifndef _PRUSS_INTERNAL_H_ >> +#define _PRUSS_INTERNAL_H_ >> >> +#include <linux/remoteproc/pruss.h> >> #include <linux/types.h> >> >> /* >> @@ -51,4 +52,4 @@ struct pruss { >> struct clk *iep_clk_mux; >> }; >> >> -#endif /* _PRUSS_DRIVER_H_ */ >> +#endif /* _PRUSS_INTERNAL_H_ */ >> diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h >> index 039b50d58df2..93a98cac7829 100644 >> --- a/include/linux/remoteproc/pruss.h >> +++ b/include/linux/remoteproc/pruss.h >> @@ -4,12 +4,14 @@ >> * >> * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com >> * Suman Anna <s-anna@ti.com> >> + * Tero Kristo <t-kristo@ti.com> >> */ >> >> #ifndef __LINUX_PRUSS_H >> #define __LINUX_PRUSS_H >> >> #include <linux/device.h> >> +#include <linux/err.h> >> #include <linux/types.h> >> >> #define PRU_RPROC_DRVNAME "pru-rproc" >> @@ -44,6 +46,23 @@ enum pru_ctable_idx { >> >> struct device_node; >> struct rproc; >> +struct pruss; >> + >> +#if IS_ENABLED(CONFIG_TI_PRUSS) >> + >> +struct pruss *pruss_get(struct rproc *rproc); >> +void pruss_put(struct pruss *pruss); >> + >> +#else >> + >> +static inline struct pruss *pruss_get(struct rproc *rproc) >> +{ >> + return ERR_PTR(-EOPNOTSUPP); >> +} >> + >> +static inline void pruss_put(struct pruss *pruss) { } >> + >> +#endif /* CONFIG_TI_PRUSS */ >> >> #if IS_ENABLED(CONFIG_PRU_REMOTEPROC) >> >> -- >> 2.25.1 >>
On Mon, 27 Mar 2023 at 23:42, Md Danish Anwar <a0501179@ti.com> wrote: > > Hi Mathieu, > > On 28/03/23 02:28, Mathieu Poirier wrote: > > Hi Danish > > > > On Thu, Mar 23, 2023 at 11:54:47AM +0530, MD Danish Anwar wrote: > >> From: Tero Kristo <t-kristo@ti.com> > >> > >> Add two new get and put API, pruss_get() and pruss_put() to the > >> PRUSS platform driver to allow client drivers to request a handle > >> to a PRUSS device. This handle will be used by client drivers to > >> request various operations of the PRUSS platform driver through > >> additional API that will be added in the following patches. > >> > >> The pruss_get() function returns the pruss handle corresponding > >> to a PRUSS device referenced by a PRU remoteproc instance. The > >> pruss_put() is the complimentary function to pruss_get(). > >> > >> Co-developed-by: Suman Anna <s-anna@ti.com> > >> Signed-off-by: Suman Anna <s-anna@ti.com> > >> Signed-off-by: Tero Kristo <t-kristo@ti.com> > >> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > >> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> > >> Signed-off-by: Puranjay Mohan <p-mohan@ti.com> > >> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> > >> Reviewed-by: Roger Quadros <rogerq@kernel.org> > >> --- > >> drivers/remoteproc/pru_rproc.c | 2 +- > >> drivers/soc/ti/pruss.c | 60 ++++++++++++++++++- > >> .../{pruss_driver.h => pruss_internal.h} | 7 ++- > >> include/linux/remoteproc/pruss.h | 19 ++++++ > >> 4 files changed, 83 insertions(+), 5 deletions(-) > >> rename include/linux/{pruss_driver.h => pruss_internal.h} (90%) > >> > >> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c > >> index b76db7fa693d..4ddd5854d56e 100644 > >> --- a/drivers/remoteproc/pru_rproc.c > >> +++ b/drivers/remoteproc/pru_rproc.c > >> @@ -19,7 +19,7 @@ > >> #include <linux/of_device.h> > >> #include <linux/of_irq.h> > >> #include <linux/remoteproc/pruss.h> > >> -#include <linux/pruss_driver.h> > >> +#include <linux/pruss_internal.h> > >> #include <linux/remoteproc.h> > >> > >> #include "remoteproc_internal.h" > >> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c > >> index 6882c86b3ce5..6c2bb02a521d 100644 > >> --- a/drivers/soc/ti/pruss.c > >> +++ b/drivers/soc/ti/pruss.c > >> @@ -6,6 +6,7 @@ > >> * Author(s): > >> * Suman Anna <s-anna@ti.com> > >> * Andrew F. Davis <afd@ti.com> > >> + * Tero Kristo <t-kristo@ti.com> > >> */ > >> > >> #include <linux/clk-provider.h> > >> @@ -16,8 +17,9 @@ > >> #include <linux/of_address.h> > >> #include <linux/of_device.h> > >> #include <linux/pm_runtime.h> > >> -#include <linux/pruss_driver.h> > >> +#include <linux/pruss_internal.h> > >> #include <linux/regmap.h> > >> +#include <linux/remoteproc.h> > >> #include <linux/slab.h> > >> > >> /** > >> @@ -30,6 +32,62 @@ struct pruss_private_data { > >> bool has_core_mux_clock; > >> }; > >> > >> +/** > >> + * pruss_get() - get the pruss for a given PRU remoteproc > >> + * @rproc: remoteproc handle of a PRU instance > >> + * > >> + * Finds the parent pruss device for a PRU given the @rproc handle of the > >> + * PRU remote processor. This function increments the pruss device's refcount, > >> + * so always use pruss_put() to decrement it back once pruss isn't needed > >> + * anymore. > >> + * > >> + * Return: pruss handle on success, and an ERR_PTR on failure using one > >> + * of the following error values > >> + * -EINVAL if invalid parameter > >> + * -ENODEV if PRU device or PRUSS device is not found > >> + */ > >> +struct pruss *pruss_get(struct rproc *rproc) > >> +{ > >> + struct pruss *pruss; > >> + struct device *dev; > >> + struct platform_device *ppdev; > >> + > >> + if (IS_ERR_OR_NULL(rproc)) > >> + return ERR_PTR(-EINVAL); > >> + > > > > There is no guarantee that @rproc is valid without calling rproc_get_by_handle() > > or pru_rproc_get(). > > > > Here in this API, we are checking if rproc is NULL or not. Also we are checking > is_pru_rproc() to make sure this rproc is pru-rproc only and not some other rproc. > > This API will be called from driver (icssg_prueth.c) which I'll post once this > series is merged. > > In the driver we are doing, > > prueth->pru[slice] = pru_rproc_get(np, pru, &pruss_id); > > pruss = pruss_get(prueth->pru[slice]); > > So, before calling pruss_get() we are in fact calling pru_rproc_get() to make > sure it's a valid rproc. > You are doing the right thing but because pruss_get() is exported globally, other people eventually using the interface may not be so rigorous. Add a comment to the pruss_get() function documentation clearly mentioning it is expected the caller will have done a pru_rproc_get() on @rproc. > I think in this API, these two checks (NULL check and is_pru_rproc) should be > OK as the driver is already calling pru_rproc_get() before this API. > > The only way to get a "pru-rproc" is by calling pru_rproc_get(), now the check > is_pru_rproc() will only be true if it is a "pru-rproc" implying > pru_rproc_get() was called before calling this API. > > Please let me know if this is OK or if any change is required. > > >> + dev = &rproc->dev; > >> + > >> + /* make sure it is PRU rproc */ > >> + if (!dev->parent || !is_pru_rproc(dev->parent)) > >> + return ERR_PTR(-ENODEV); > >> + > >> + ppdev = to_platform_device(dev->parent->parent); > >> + pruss = platform_get_drvdata(ppdev); > >> + if (!pruss) > >> + return ERR_PTR(-ENODEV); > >> + > >> + get_device(pruss->dev); > >> + > >> + return pruss; > >> +} > >> +EXPORT_SYMBOL_GPL(pruss_get); > >> + > >> +/** > >> + * pruss_put() - decrement pruss device's usecount > >> + * @pruss: pruss handle > >> + * > >> + * Complimentary function for pruss_get(). Needs to be called > >> + * after the PRUSS is used, and only if the pruss_get() succeeds. > >> + */ > >> +void pruss_put(struct pruss *pruss) > >> +{ > >> + if (IS_ERR_OR_NULL(pruss)) > >> + return; > >> + > >> + put_device(pruss->dev); > >> +} > >> +EXPORT_SYMBOL_GPL(pruss_put); > >> + > >> static void pruss_of_free_clk_provider(void *data) > >> { > >> struct device_node *clk_mux_np = data; > >> diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_internal.h > >> similarity index 90% > >> rename from include/linux/pruss_driver.h > >> rename to include/linux/pruss_internal.h > >> index ecfded30ed05..8f91cb164054 100644 > >> --- a/include/linux/pruss_driver.h > >> +++ b/include/linux/pruss_internal.h > >> @@ -6,9 +6,10 @@ > >> * Suman Anna <s-anna@ti.com> > >> */ > >> > >> -#ifndef _PRUSS_DRIVER_H_ > >> -#define _PRUSS_DRIVER_H_ > >> +#ifndef _PRUSS_INTERNAL_H_ > >> +#define _PRUSS_INTERNAL_H_ > >> > >> +#include <linux/remoteproc/pruss.h> > >> #include <linux/types.h> > >> > >> /* > >> @@ -51,4 +52,4 @@ struct pruss { > >> struct clk *iep_clk_mux; > >> }; > >> > >> -#endif /* _PRUSS_DRIVER_H_ */ > >> +#endif /* _PRUSS_INTERNAL_H_ */ > >> diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h > >> index 039b50d58df2..93a98cac7829 100644 > >> --- a/include/linux/remoteproc/pruss.h > >> +++ b/include/linux/remoteproc/pruss.h > >> @@ -4,12 +4,14 @@ > >> * > >> * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com > >> * Suman Anna <s-anna@ti.com> > >> + * Tero Kristo <t-kristo@ti.com> > >> */ > >> > >> #ifndef __LINUX_PRUSS_H > >> #define __LINUX_PRUSS_H > >> > >> #include <linux/device.h> > >> +#include <linux/err.h> > >> #include <linux/types.h> > >> > >> #define PRU_RPROC_DRVNAME "pru-rproc" > >> @@ -44,6 +46,23 @@ enum pru_ctable_idx { > >> > >> struct device_node; > >> struct rproc; > >> +struct pruss; > >> + > >> +#if IS_ENABLED(CONFIG_TI_PRUSS) > >> + > >> +struct pruss *pruss_get(struct rproc *rproc); > >> +void pruss_put(struct pruss *pruss); > >> + > >> +#else > >> + > >> +static inline struct pruss *pruss_get(struct rproc *rproc) > >> +{ > >> + return ERR_PTR(-EOPNOTSUPP); > >> +} > >> + > >> +static inline void pruss_put(struct pruss *pruss) { } > >> + > >> +#endif /* CONFIG_TI_PRUSS */ > >> > >> #if IS_ENABLED(CONFIG_PRU_REMOTEPROC) > >> > >> -- > >> 2.25.1 > >> > > -- > Thanks and Regards, > Danish.
On 29/03/23 23:29, Mathieu Poirier wrote: > On Mon, 27 Mar 2023 at 23:42, Md Danish Anwar <a0501179@ti.com> wrote: >> >> Hi Mathieu, >> >> On 28/03/23 02:28, Mathieu Poirier wrote: >>> Hi Danish >>> >>> On Thu, Mar 23, 2023 at 11:54:47AM +0530, MD Danish Anwar wrote: >>>> From: Tero Kristo <t-kristo@ti.com> >>>> >>>> Add two new get and put API, pruss_get() and pruss_put() to the >>>> PRUSS platform driver to allow client drivers to request a handle >>>> to a PRUSS device. This handle will be used by client drivers to >>>> request various operations of the PRUSS platform driver through >>>> additional API that will be added in the following patches. >>>> >>>> The pruss_get() function returns the pruss handle corresponding >>>> to a PRUSS device referenced by a PRU remoteproc instance. The >>>> pruss_put() is the complimentary function to pruss_get(). >>>> >>>> Co-developed-by: Suman Anna <s-anna@ti.com> >>>> Signed-off-by: Suman Anna <s-anna@ti.com> >>>> Signed-off-by: Tero Kristo <t-kristo@ti.com> >>>> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >>>> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> >>>> Signed-off-by: Puranjay Mohan <p-mohan@ti.com> >>>> Signed-off-by: MD Danish Anwar <danishanwar@ti.com> >>>> Reviewed-by: Roger Quadros <rogerq@kernel.org> >>>> --- >>>> drivers/remoteproc/pru_rproc.c | 2 +- >>>> drivers/soc/ti/pruss.c | 60 ++++++++++++++++++- >>>> .../{pruss_driver.h => pruss_internal.h} | 7 ++- >>>> include/linux/remoteproc/pruss.h | 19 ++++++ >>>> 4 files changed, 83 insertions(+), 5 deletions(-) >>>> rename include/linux/{pruss_driver.h => pruss_internal.h} (90%) >>>> >>>> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c >>>> index b76db7fa693d..4ddd5854d56e 100644 >>>> --- a/drivers/remoteproc/pru_rproc.c >>>> +++ b/drivers/remoteproc/pru_rproc.c >>>> @@ -19,7 +19,7 @@ >>>> #include <linux/of_device.h> >>>> #include <linux/of_irq.h> >>>> #include <linux/remoteproc/pruss.h> >>>> -#include <linux/pruss_driver.h> >>>> +#include <linux/pruss_internal.h> >>>> #include <linux/remoteproc.h> >>>> >>>> #include "remoteproc_internal.h" >>>> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c >>>> index 6882c86b3ce5..6c2bb02a521d 100644 >>>> --- a/drivers/soc/ti/pruss.c >>>> +++ b/drivers/soc/ti/pruss.c >>>> @@ -6,6 +6,7 @@ >>>> * Author(s): >>>> * Suman Anna <s-anna@ti.com> >>>> * Andrew F. Davis <afd@ti.com> >>>> + * Tero Kristo <t-kristo@ti.com> >>>> */ >>>> >>>> #include <linux/clk-provider.h> >>>> @@ -16,8 +17,9 @@ >>>> #include <linux/of_address.h> >>>> #include <linux/of_device.h> >>>> #include <linux/pm_runtime.h> >>>> -#include <linux/pruss_driver.h> >>>> +#include <linux/pruss_internal.h> >>>> #include <linux/regmap.h> >>>> +#include <linux/remoteproc.h> >>>> #include <linux/slab.h> >>>> >>>> /** >>>> @@ -30,6 +32,62 @@ struct pruss_private_data { >>>> bool has_core_mux_clock; >>>> }; >>>> >>>> +/** >>>> + * pruss_get() - get the pruss for a given PRU remoteproc >>>> + * @rproc: remoteproc handle of a PRU instance >>>> + * >>>> + * Finds the parent pruss device for a PRU given the @rproc handle of the >>>> + * PRU remote processor. This function increments the pruss device's refcount, >>>> + * so always use pruss_put() to decrement it back once pruss isn't needed >>>> + * anymore. >>>> + * >>>> + * Return: pruss handle on success, and an ERR_PTR on failure using one >>>> + * of the following error values >>>> + * -EINVAL if invalid parameter >>>> + * -ENODEV if PRU device or PRUSS device is not found >>>> + */ >>>> +struct pruss *pruss_get(struct rproc *rproc) >>>> +{ >>>> + struct pruss *pruss; >>>> + struct device *dev; >>>> + struct platform_device *ppdev; >>>> + >>>> + if (IS_ERR_OR_NULL(rproc)) >>>> + return ERR_PTR(-EINVAL); >>>> + >>> >>> There is no guarantee that @rproc is valid without calling rproc_get_by_handle() >>> or pru_rproc_get(). >>> >> >> Here in this API, we are checking if rproc is NULL or not. Also we are checking >> is_pru_rproc() to make sure this rproc is pru-rproc only and not some other rproc. >> >> This API will be called from driver (icssg_prueth.c) which I'll post once this >> series is merged. >> >> In the driver we are doing, >> >> prueth->pru[slice] = pru_rproc_get(np, pru, &pruss_id); >> >> pruss = pruss_get(prueth->pru[slice]); >> >> So, before calling pruss_get() we are in fact calling pru_rproc_get() to make >> sure it's a valid rproc. >> > > You are doing the right thing but because pruss_get() is exported > globally, other people eventually using the interface may not be so > rigorous. Add a comment to the pruss_get() function documentation > clearly mentioning it is expected the caller will have done a > pru_rproc_get() on @rproc. > Sure, Mathieu. I will add the required comment in pruss_get() documentation. >> I think in this API, these two checks (NULL check and is_pru_rproc) should be >> OK as the driver is already calling pru_rproc_get() before this API. >> >> The only way to get a "pru-rproc" is by calling pru_rproc_get(), now the check >> is_pru_rproc() will only be true if it is a "pru-rproc" implying >> pru_rproc_get() was called before calling this API. >> >> Please let me know if this is OK or if any change is required. >> >>>> + dev = &rproc->dev; >>>> + >>>> + /* make sure it is PRU rproc */ >>>> + if (!dev->parent || !is_pru_rproc(dev->parent)) >>>> + return ERR_PTR(-ENODEV); >>>> + >>>> + ppdev = to_platform_device(dev->parent->parent); >>>> + pruss = platform_get_drvdata(ppdev); >>>> + if (!pruss) >>>> + return ERR_PTR(-ENODEV); >>>> + >>>> + get_device(pruss->dev); >>>> + >>>> + return pruss; >>>> +} >>>> +EXPORT_SYMBOL_GPL(pruss_get); >>>> + >>>> +/** >>>> + * pruss_put() - decrement pruss device's usecount >>>> + * @pruss: pruss handle >>>> + * >>>> + * Complimentary function for pruss_get(). Needs to be called >>>> + * after the PRUSS is used, and only if the pruss_get() succeeds. >>>> + */ >>>> +void pruss_put(struct pruss *pruss) >>>> +{ >>>> + if (IS_ERR_OR_NULL(pruss)) >>>> + return; >>>> + >>>> + put_device(pruss->dev); >>>> +} >>>> +EXPORT_SYMBOL_GPL(pruss_put); >>>> + >>>> static void pruss_of_free_clk_provider(void *data) >>>> { >>>> struct device_node *clk_mux_np = data; >>>> diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_internal.h >>>> similarity index 90% >>>> rename from include/linux/pruss_driver.h >>>> rename to include/linux/pruss_internal.h >>>> index ecfded30ed05..8f91cb164054 100644 >>>> --- a/include/linux/pruss_driver.h >>>> +++ b/include/linux/pruss_internal.h >>>> @@ -6,9 +6,10 @@ >>>> * Suman Anna <s-anna@ti.com> >>>> */ >>>> >>>> -#ifndef _PRUSS_DRIVER_H_ >>>> -#define _PRUSS_DRIVER_H_ >>>> +#ifndef _PRUSS_INTERNAL_H_ >>>> +#define _PRUSS_INTERNAL_H_ >>>> >>>> +#include <linux/remoteproc/pruss.h> >>>> #include <linux/types.h> >>>> >>>> /* >>>> @@ -51,4 +52,4 @@ struct pruss { >>>> struct clk *iep_clk_mux; >>>> }; >>>> >>>> -#endif /* _PRUSS_DRIVER_H_ */ >>>> +#endif /* _PRUSS_INTERNAL_H_ */ >>>> diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h >>>> index 039b50d58df2..93a98cac7829 100644 >>>> --- a/include/linux/remoteproc/pruss.h >>>> +++ b/include/linux/remoteproc/pruss.h >>>> @@ -4,12 +4,14 @@ >>>> * >>>> * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com >>>> * Suman Anna <s-anna@ti.com> >>>> + * Tero Kristo <t-kristo@ti.com> >>>> */ >>>> >>>> #ifndef __LINUX_PRUSS_H >>>> #define __LINUX_PRUSS_H >>>> >>>> #include <linux/device.h> >>>> +#include <linux/err.h> >>>> #include <linux/types.h> >>>> >>>> #define PRU_RPROC_DRVNAME "pru-rproc" >>>> @@ -44,6 +46,23 @@ enum pru_ctable_idx { >>>> >>>> struct device_node; >>>> struct rproc; >>>> +struct pruss; >>>> + >>>> +#if IS_ENABLED(CONFIG_TI_PRUSS) >>>> + >>>> +struct pruss *pruss_get(struct rproc *rproc); >>>> +void pruss_put(struct pruss *pruss); >>>> + >>>> +#else >>>> + >>>> +static inline struct pruss *pruss_get(struct rproc *rproc) >>>> +{ >>>> + return ERR_PTR(-EOPNOTSUPP); >>>> +} >>>> + >>>> +static inline void pruss_put(struct pruss *pruss) { } >>>> + >>>> +#endif /* CONFIG_TI_PRUSS */ >>>> >>>> #if IS_ENABLED(CONFIG_PRU_REMOTEPROC) >>>> >>>> -- >>>> 2.25.1 >>>> >> >> -- >> Thanks and Regards, >> Danish.
diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c index b76db7fa693d..4ddd5854d56e 100644 --- a/drivers/remoteproc/pru_rproc.c +++ b/drivers/remoteproc/pru_rproc.c @@ -19,7 +19,7 @@ #include <linux/of_device.h> #include <linux/of_irq.h> #include <linux/remoteproc/pruss.h> -#include <linux/pruss_driver.h> +#include <linux/pruss_internal.h> #include <linux/remoteproc.h> #include "remoteproc_internal.h" diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c index 6882c86b3ce5..6c2bb02a521d 100644 --- a/drivers/soc/ti/pruss.c +++ b/drivers/soc/ti/pruss.c @@ -6,6 +6,7 @@ * Author(s): * Suman Anna <s-anna@ti.com> * Andrew F. Davis <afd@ti.com> + * Tero Kristo <t-kristo@ti.com> */ #include <linux/clk-provider.h> @@ -16,8 +17,9 @@ #include <linux/of_address.h> #include <linux/of_device.h> #include <linux/pm_runtime.h> -#include <linux/pruss_driver.h> +#include <linux/pruss_internal.h> #include <linux/regmap.h> +#include <linux/remoteproc.h> #include <linux/slab.h> /** @@ -30,6 +32,62 @@ struct pruss_private_data { bool has_core_mux_clock; }; +/** + * pruss_get() - get the pruss for a given PRU remoteproc + * @rproc: remoteproc handle of a PRU instance + * + * Finds the parent pruss device for a PRU given the @rproc handle of the + * PRU remote processor. This function increments the pruss device's refcount, + * so always use pruss_put() to decrement it back once pruss isn't needed + * anymore. + * + * Return: pruss handle on success, and an ERR_PTR on failure using one + * of the following error values + * -EINVAL if invalid parameter + * -ENODEV if PRU device or PRUSS device is not found + */ +struct pruss *pruss_get(struct rproc *rproc) +{ + struct pruss *pruss; + struct device *dev; + struct platform_device *ppdev; + + if (IS_ERR_OR_NULL(rproc)) + return ERR_PTR(-EINVAL); + + dev = &rproc->dev; + + /* make sure it is PRU rproc */ + if (!dev->parent || !is_pru_rproc(dev->parent)) + return ERR_PTR(-ENODEV); + + ppdev = to_platform_device(dev->parent->parent); + pruss = platform_get_drvdata(ppdev); + if (!pruss) + return ERR_PTR(-ENODEV); + + get_device(pruss->dev); + + return pruss; +} +EXPORT_SYMBOL_GPL(pruss_get); + +/** + * pruss_put() - decrement pruss device's usecount + * @pruss: pruss handle + * + * Complimentary function for pruss_get(). Needs to be called + * after the PRUSS is used, and only if the pruss_get() succeeds. + */ +void pruss_put(struct pruss *pruss) +{ + if (IS_ERR_OR_NULL(pruss)) + return; + + put_device(pruss->dev); +} +EXPORT_SYMBOL_GPL(pruss_put); + static void pruss_of_free_clk_provider(void *data) { struct device_node *clk_mux_np = data; diff --git a/include/linux/pruss_driver.h b/include/linux/pruss_internal.h similarity index 90% rename from include/linux/pruss_driver.h rename to include/linux/pruss_internal.h index ecfded30ed05..8f91cb164054 100644 --- a/include/linux/pruss_driver.h +++ b/include/linux/pruss_internal.h @@ -6,9 +6,10 @@ * Suman Anna <s-anna@ti.com> */ -#ifndef _PRUSS_DRIVER_H_ -#define _PRUSS_DRIVER_H_ +#ifndef _PRUSS_INTERNAL_H_ +#define _PRUSS_INTERNAL_H_ +#include <linux/remoteproc/pruss.h> #include <linux/types.h> /* @@ -51,4 +52,4 @@ struct pruss { struct clk *iep_clk_mux; }; -#endif /* _PRUSS_DRIVER_H_ */ +#endif /* _PRUSS_INTERNAL_H_ */ diff --git a/include/linux/remoteproc/pruss.h b/include/linux/remoteproc/pruss.h index 039b50d58df2..93a98cac7829 100644 --- a/include/linux/remoteproc/pruss.h +++ b/include/linux/remoteproc/pruss.h @@ -4,12 +4,14 @@ * * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com * Suman Anna <s-anna@ti.com> + * Tero Kristo <t-kristo@ti.com> */ #ifndef __LINUX_PRUSS_H #define __LINUX_PRUSS_H #include <linux/device.h> +#include <linux/err.h> #include <linux/types.h> #define PRU_RPROC_DRVNAME "pru-rproc" @@ -44,6 +46,23 @@ enum pru_ctable_idx { struct device_node; struct rproc; +struct pruss; + +#if IS_ENABLED(CONFIG_TI_PRUSS) + +struct pruss *pruss_get(struct rproc *rproc); +void pruss_put(struct pruss *pruss); + +#else + +static inline struct pruss *pruss_get(struct rproc *rproc) +{ + return ERR_PTR(-EOPNOTSUPP); +} + +static inline void pruss_put(struct pruss *pruss) { } + +#endif /* CONFIG_TI_PRUSS */ #if IS_ENABLED(CONFIG_PRU_REMOTEPROC)