| Message ID | 20220412125035.40312-5-quic_jinlmao@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Coresight: Add support for TPDM and TPDA | expand |
Hi, On Tue, 12 Apr 2022 at 13:51, Mao Jinlong <quic_jinlmao@quicinc.com> wrote: > > TPDM serves as data collection component for various dataset types. > DSB(Discrete Single Bit) is one of the dataset types. DSB subunit > can be enabled for data collection by writing 1 to the first bit of > DSB_CR register. This change is to add enable/disable function for > DSB dataset by writing DSB_CR register. > > Signed-off-by: Tao Zhang <quic_taozha@quicinc.com> > Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com> > --- > drivers/hwtracing/coresight/coresight-tpdm.c | 61 ++++++++++++++++++++ > drivers/hwtracing/coresight/coresight-tpdm.h | 21 +++++++ > 2 files changed, 82 insertions(+) > > diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c > index 3900ae50670a..d7b970cdcf51 100644 > --- a/drivers/hwtracing/coresight/coresight-tpdm.c > +++ b/drivers/hwtracing/coresight/coresight-tpdm.c > @@ -20,7 +20,28 @@ > > DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm"); > > +static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata) > +{ > + u32 val; > + > + /* Set the enable bit of DSB control register to 1 */ > + val = readl_relaxed(drvdata->base + TPDM_DSB_CR); > + val = val | BIT(0); Please use #defined values, declared in the header file rather than BIT(x) here. (the etm4x drivers have been recently updated to use the same pattern). e.g. val |= TPDM_DSB_CR_ENA; > + writel_relaxed(val, drvdata->base + TPDM_DSB_CR); > +} > + > /* TPDM enable operations */ > +static void _tpdm_enable(struct tpdm_drvdata *drvdata) > +{ > + CS_UNLOCK(drvdata->base); > + > + /* Check if DSB datasets is present for TPDM. */ > + if (test_bit(TPDM_DS_DSB, drvdata->datasets)) > + tpdm_enable_dsb(drvdata); > + > + CS_LOCK(drvdata->base); > +} > + > static int tpdm_enable(struct coresight_device *csdev, > struct perf_event *event, u32 mode) > { > @@ -32,6 +53,7 @@ static int tpdm_enable(struct coresight_device *csdev, > return -EBUSY; > } > > + _tpdm_enable(drvdata); > drvdata->enable = true; > mutex_unlock(&drvdata->lock); > > @@ -39,7 +61,29 @@ static int tpdm_enable(struct coresight_device *csdev, > return 0; > } > > +static void tpdm_disable_dsb(struct tpdm_drvdata *drvdata) > +{ > + u32 val; > + > + /* Set the enable bit of DSB control register to 0 */ > + val = readl_relaxed(drvdata->base + TPDM_DSB_CR); > + val = val & ~BIT(0); val &= ~TPDM_DSB_CR_ENA; > + writel_relaxed(val, drvdata->base + TPDM_DSB_CR); > +} > + > /* TPDM disable operations */ > +static void _tpdm_disable(struct tpdm_drvdata *drvdata) > +{ > + CS_UNLOCK(drvdata->base); > + > + /* Check if DSB datasets is present for TPDM. */ > + if (test_bit(TPDM_DS_DSB, drvdata->datasets)) > + tpdm_disable_dsb(drvdata); > + > + CS_LOCK(drvdata->base); > + > +} > + > static void tpdm_disable(struct coresight_device *csdev, > struct perf_event *event) > { > @@ -51,6 +95,7 @@ static void tpdm_disable(struct coresight_device *csdev, > return; > } > > + _tpdm_disable(drvdata); > drvdata->enable = false; > mutex_unlock(&drvdata->lock); > > @@ -66,6 +111,21 @@ static const struct coresight_ops tpdm_cs_ops = { > .source_ops = &tpdm_source_ops, > }; > > +static void tpdm_init_default_data(struct tpdm_drvdata *drvdata) > +{ > + int i; > + u32 pidr; > + > + CS_UNLOCK(drvdata->base); > + /* Get the datasets present on the TPDM. */ > + pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0); > + for (i = 0; i < TPDM_DATASETS; i++) { > + if (pidr & BIT(i)) > + __set_bit(i, drvdata->datasets); Could this be considerably simpified? - there are a maximum of 7 bits for datasets - and you are setting the same bit in drvdata->datasets for each bit in pidr e.g. if the datasets declaration is a simple unsigned long, then the following is easier to read and understand: drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0); The tests above could then become: if (drvdata->datasets & BIT(TPDM_DS_DSB)) ... > + } > + CS_LOCK(drvdata->base); > +} > + > static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) > { > struct device *dev = &adev->dev; > @@ -104,6 +164,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) > if (IS_ERR(drvdata->csdev)) > return PTR_ERR(drvdata->csdev); > > + tpdm_init_default_data(drvdata); > /* Decrease pm refcount when probe is done.*/ > pm_runtime_put(&adev->dev); > > diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h > index 94a7748a5426..8f05070879c4 100644 > --- a/drivers/hwtracing/coresight/coresight-tpdm.h > +++ b/drivers/hwtracing/coresight/coresight-tpdm.h > @@ -6,6 +6,25 @@ > #ifndef _CORESIGHT_CORESIGHT_TPDM_H > #define _CORESIGHT_CORESIGHT_TPDM_H > > +/* The max number of the datasets that TPDM supports */ > +#define TPDM_DATASETS 7 > + > +/* DSB Subunit Registers */ > +#define TPDM_DSB_CR (0x780) > + declare the enable bit here with comment documenting usage - see above. > +/** > + * This enum is for PERIPHIDR0 register of TPDM. > + * The fields [6:0] of PERIPHIDR0 are used to determine what > + * interfaces and subunits are present on a given TPDM. > + * > + * PERIPHIDR0[0] : Fix to 1 if ImplDef subunit present, else 0 > + * PERIPHIDR0[1] : Fix to 1 if DSB subunit present, else 0 > + */ > +enum tpdm_dataset { > + TPDM_DS_IMPLDEF, > + TPDM_DS_DSB, > +}; > + > /** > * struct tpdm_drvdata - specifics associated to an TPDM component > * @base: memory mapped base address for this component. > @@ -13,6 +32,7 @@ > * @csdev: component vitals needed by the framework. > * @lock: lock for the enable value. > * @enable: enable status of the component. > + * @datasets: The datasets types present of the TPDM. > */ > > struct tpdm_drvdata { > @@ -21,6 +41,7 @@ struct tpdm_drvdata { > struct coresight_device *csdev; > struct mutex lock; > bool enable; > + DECLARE_BITMAP(datasets, TPDM_DATASETS); Could this simply be declared as an unsigned long? - then simplify the code in the .c file. Regards Mike > }; > > #endif /* _CORESIGHT_CORESIGHT_TPDM_H */ > -- > 2.17.1 >
Thank you Mike for the review. On 4/19/2022 5:23 PM, Mike Leach wrote: > Hi, > > On Tue, 12 Apr 2022 at 13:51, Mao Jinlong <quic_jinlmao@quicinc.com> wrote: >> TPDM serves as data collection component for various dataset types. >> DSB(Discrete Single Bit) is one of the dataset types. DSB subunit >> can be enabled for data collection by writing 1 to the first bit of >> DSB_CR register. This change is to add enable/disable function for >> DSB dataset by writing DSB_CR register. >> >> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com> >> Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com> >> --- >> drivers/hwtracing/coresight/coresight-tpdm.c | 61 ++++++++++++++++++++ >> drivers/hwtracing/coresight/coresight-tpdm.h | 21 +++++++ >> 2 files changed, 82 insertions(+) >> >> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c >> index 3900ae50670a..d7b970cdcf51 100644 >> --- a/drivers/hwtracing/coresight/coresight-tpdm.c >> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c >> @@ -20,7 +20,28 @@ >> >> DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm"); >> >> +static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata) >> +{ >> + u32 val; >> + >> + /* Set the enable bit of DSB control register to 1 */ >> + val = readl_relaxed(drvdata->base + TPDM_DSB_CR); >> + val = val | BIT(0); > Please use #defined values, declared in the header file rather than > BIT(x) here. (the etm4x drivers have been recently updated to use the > same pattern). > e.g. > val |= TPDM_DSB_CR_ENA; I will update in next version. >> + writel_relaxed(val, drvdata->base + TPDM_DSB_CR); >> +} >> + >> /* TPDM enable operations */ >> +static void _tpdm_enable(struct tpdm_drvdata *drvdata) >> +{ >> + CS_UNLOCK(drvdata->base); >> + >> + /* Check if DSB datasets is present for TPDM. */ >> + if (test_bit(TPDM_DS_DSB, drvdata->datasets)) >> + tpdm_enable_dsb(drvdata); >> + >> + CS_LOCK(drvdata->base); >> +} >> + >> static int tpdm_enable(struct coresight_device *csdev, >> struct perf_event *event, u32 mode) >> { >> @@ -32,6 +53,7 @@ static int tpdm_enable(struct coresight_device *csdev, >> return -EBUSY; >> } >> >> + _tpdm_enable(drvdata); >> drvdata->enable = true; >> mutex_unlock(&drvdata->lock); >> >> @@ -39,7 +61,29 @@ static int tpdm_enable(struct coresight_device *csdev, >> return 0; >> } >> >> +static void tpdm_disable_dsb(struct tpdm_drvdata *drvdata) >> +{ >> + u32 val; >> + >> + /* Set the enable bit of DSB control register to 0 */ >> + val = readl_relaxed(drvdata->base + TPDM_DSB_CR); >> + val = val & ~BIT(0); > val &= ~TPDM_DSB_CR_ENA; I will update in next version. > >> + writel_relaxed(val, drvdata->base + TPDM_DSB_CR); >> +} >> + >> /* TPDM disable operations */ >> +static void _tpdm_disable(struct tpdm_drvdata *drvdata) >> +{ >> + CS_UNLOCK(drvdata->base); >> + >> + /* Check if DSB datasets is present for TPDM. */ >> + if (test_bit(TPDM_DS_DSB, drvdata->datasets)) >> + tpdm_disable_dsb(drvdata); >> + >> + CS_LOCK(drvdata->base); >> + >> +} >> + >> static void tpdm_disable(struct coresight_device *csdev, >> struct perf_event *event) >> { >> @@ -51,6 +95,7 @@ static void tpdm_disable(struct coresight_device *csdev, >> return; >> } >> >> + _tpdm_disable(drvdata); >> drvdata->enable = false; >> mutex_unlock(&drvdata->lock); >> >> @@ -66,6 +111,21 @@ static const struct coresight_ops tpdm_cs_ops = { >> .source_ops = &tpdm_source_ops, >> }; >> >> +static void tpdm_init_default_data(struct tpdm_drvdata *drvdata) >> +{ >> + int i; >> + u32 pidr; >> + >> + CS_UNLOCK(drvdata->base); >> + /* Get the datasets present on the TPDM. */ >> + pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0); >> + for (i = 0; i < TPDM_DATASETS; i++) { >> + if (pidr & BIT(i)) >> + __set_bit(i, drvdata->datasets); > Could this be considerably simpified? - there are a maximum of 7 bits > for datasets - and you are setting the same bit in drvdata->datasets > for each bit in pidr > > e.g. if the datasets declaration is a simple unsigned long, then the > following is easier to read and understand: > > drvdata->datasets |= pidr & GENMASK(TPDM_DATASETS - 1, 0); > > The tests above could then become: > if (drvdata->datasets & BIT(TPDM_DS_DSB)) ... > I will check your suggestion and update in next version. >> + } >> + CS_LOCK(drvdata->base); >> +} >> + >> static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) >> { >> struct device *dev = &adev->dev; >> @@ -104,6 +164,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) >> if (IS_ERR(drvdata->csdev)) >> return PTR_ERR(drvdata->csdev); >> >> + tpdm_init_default_data(drvdata); >> /* Decrease pm refcount when probe is done.*/ >> pm_runtime_put(&adev->dev); >> >> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h >> index 94a7748a5426..8f05070879c4 100644 >> --- a/drivers/hwtracing/coresight/coresight-tpdm.h >> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h >> @@ -6,6 +6,25 @@ >> #ifndef _CORESIGHT_CORESIGHT_TPDM_H >> #define _CORESIGHT_CORESIGHT_TPDM_H >> >> +/* The max number of the datasets that TPDM supports */ >> +#define TPDM_DATASETS 7 >> + >> +/* DSB Subunit Registers */ >> +#define TPDM_DSB_CR (0x780) >> + > declare the enable bit here with comment documenting usage - see above. > >> +/** >> + * This enum is for PERIPHIDR0 register of TPDM. >> + * The fields [6:0] of PERIPHIDR0 are used to determine what >> + * interfaces and subunits are present on a given TPDM. >> + * >> + * PERIPHIDR0[0] : Fix to 1 if ImplDef subunit present, else 0 >> + * PERIPHIDR0[1] : Fix to 1 if DSB subunit present, else 0 >> + */ >> +enum tpdm_dataset { >> + TPDM_DS_IMPLDEF, >> + TPDM_DS_DSB, >> +}; >> + >> /** >> * struct tpdm_drvdata - specifics associated to an TPDM component >> * @base: memory mapped base address for this component. >> @@ -13,6 +32,7 @@ >> * @csdev: component vitals needed by the framework. >> * @lock: lock for the enable value. >> * @enable: enable status of the component. >> + * @datasets: The datasets types present of the TPDM. >> */ >> >> struct tpdm_drvdata { >> @@ -21,6 +41,7 @@ struct tpdm_drvdata { >> struct coresight_device *csdev; >> struct mutex lock; >> bool enable; >> + DECLARE_BITMAP(datasets, TPDM_DATASETS); > Could this simply be declared as an unsigned long? - then simplify the > code in the .c file. > > Regards > > Mike > >> }; >> >> #endif /* _CORESIGHT_CORESIGHT_TPDM_H */ >> -- >> 2.17.1 >> >
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c index 3900ae50670a..d7b970cdcf51 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.c +++ b/drivers/hwtracing/coresight/coresight-tpdm.c @@ -20,7 +20,28 @@ DEFINE_CORESIGHT_DEVLIST(tpdm_devs, "tpdm"); +static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata) +{ + u32 val; + + /* Set the enable bit of DSB control register to 1 */ + val = readl_relaxed(drvdata->base + TPDM_DSB_CR); + val = val | BIT(0); + writel_relaxed(val, drvdata->base + TPDM_DSB_CR); +} + /* TPDM enable operations */ +static void _tpdm_enable(struct tpdm_drvdata *drvdata) +{ + CS_UNLOCK(drvdata->base); + + /* Check if DSB datasets is present for TPDM. */ + if (test_bit(TPDM_DS_DSB, drvdata->datasets)) + tpdm_enable_dsb(drvdata); + + CS_LOCK(drvdata->base); +} + static int tpdm_enable(struct coresight_device *csdev, struct perf_event *event, u32 mode) { @@ -32,6 +53,7 @@ static int tpdm_enable(struct coresight_device *csdev, return -EBUSY; } + _tpdm_enable(drvdata); drvdata->enable = true; mutex_unlock(&drvdata->lock); @@ -39,7 +61,29 @@ static int tpdm_enable(struct coresight_device *csdev, return 0; } +static void tpdm_disable_dsb(struct tpdm_drvdata *drvdata) +{ + u32 val; + + /* Set the enable bit of DSB control register to 0 */ + val = readl_relaxed(drvdata->base + TPDM_DSB_CR); + val = val & ~BIT(0); + writel_relaxed(val, drvdata->base + TPDM_DSB_CR); +} + /* TPDM disable operations */ +static void _tpdm_disable(struct tpdm_drvdata *drvdata) +{ + CS_UNLOCK(drvdata->base); + + /* Check if DSB datasets is present for TPDM. */ + if (test_bit(TPDM_DS_DSB, drvdata->datasets)) + tpdm_disable_dsb(drvdata); + + CS_LOCK(drvdata->base); + +} + static void tpdm_disable(struct coresight_device *csdev, struct perf_event *event) { @@ -51,6 +95,7 @@ static void tpdm_disable(struct coresight_device *csdev, return; } + _tpdm_disable(drvdata); drvdata->enable = false; mutex_unlock(&drvdata->lock); @@ -66,6 +111,21 @@ static const struct coresight_ops tpdm_cs_ops = { .source_ops = &tpdm_source_ops, }; +static void tpdm_init_default_data(struct tpdm_drvdata *drvdata) +{ + int i; + u32 pidr; + + CS_UNLOCK(drvdata->base); + /* Get the datasets present on the TPDM. */ + pidr = readl_relaxed(drvdata->base + CORESIGHT_PERIPHIDR0); + for (i = 0; i < TPDM_DATASETS; i++) { + if (pidr & BIT(i)) + __set_bit(i, drvdata->datasets); + } + CS_LOCK(drvdata->base); +} + static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) { struct device *dev = &adev->dev; @@ -104,6 +164,7 @@ static int tpdm_probe(struct amba_device *adev, const struct amba_id *id) if (IS_ERR(drvdata->csdev)) return PTR_ERR(drvdata->csdev); + tpdm_init_default_data(drvdata); /* Decrease pm refcount when probe is done.*/ pm_runtime_put(&adev->dev); diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h index 94a7748a5426..8f05070879c4 100644 --- a/drivers/hwtracing/coresight/coresight-tpdm.h +++ b/drivers/hwtracing/coresight/coresight-tpdm.h @@ -6,6 +6,25 @@ #ifndef _CORESIGHT_CORESIGHT_TPDM_H #define _CORESIGHT_CORESIGHT_TPDM_H +/* The max number of the datasets that TPDM supports */ +#define TPDM_DATASETS 7 + +/* DSB Subunit Registers */ +#define TPDM_DSB_CR (0x780) + +/** + * This enum is for PERIPHIDR0 register of TPDM. + * The fields [6:0] of PERIPHIDR0 are used to determine what + * interfaces and subunits are present on a given TPDM. + * + * PERIPHIDR0[0] : Fix to 1 if ImplDef subunit present, else 0 + * PERIPHIDR0[1] : Fix to 1 if DSB subunit present, else 0 + */ +enum tpdm_dataset { + TPDM_DS_IMPLDEF, + TPDM_DS_DSB, +}; + /** * struct tpdm_drvdata - specifics associated to an TPDM component * @base: memory mapped base address for this component. @@ -13,6 +32,7 @@ * @csdev: component vitals needed by the framework. * @lock: lock for the enable value. * @enable: enable status of the component. + * @datasets: The datasets types present of the TPDM. */ struct tpdm_drvdata { @@ -21,6 +41,7 @@ struct tpdm_drvdata { struct coresight_device *csdev; struct mutex lock; bool enable; + DECLARE_BITMAP(datasets, TPDM_DATASETS); }; #endif /* _CORESIGHT_CORESIGHT_TPDM_H */