Messages in this thread Patch in this message | | | Date | Thu, 7 Jan 2021 17:18:23 -0700 | From | Mathieu Poirier <> | Subject | Re: [PATCH v6 12/26] coresight: etm4x: Check for Software Lock |
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On Thu, Jan 07, 2021 at 12:38:45PM +0000, Suzuki K Poulose wrote: > The Software lock is not implemented for system instructions > based accesses. So, skip the lock register access in such > cases. > > Cc: Mike Leach <mike.leach@linaro.org> > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> > --- > .../coresight/coresight-etm4x-core.c | 40 ++++++++++++------- > 1 file changed, 26 insertions(+), 14 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c > index da0b64dd51d0..f947d6ddf9e3 100644 > --- a/drivers/hwtracing/coresight/coresight-etm4x-core.c > +++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c > @@ -133,6 +133,21 @@ static void etm4_os_lock(struct etmv4_drvdata *drvdata) > isb(); > } > > +static void etm4_cs_lock(struct etmv4_drvdata *drvdata, > + struct csdev_access *csa) > +{ > + /* Software Lock is only accessible via memory mapped interface */ > + if (csa->io_mem) > + CS_LOCK(csa->base); > +} > + > +static void etm4_cs_unlock(struct etmv4_drvdata *drvdata, > + struct csdev_access *csa)
Indentation
> +{ > + if (csa->io_mem) > + CS_UNLOCK(csa->base); > +} > + > static bool etm4_arch_supported(u8 arch) > { > /* Mask out the minor version number */ > @@ -263,7 +278,8 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata) > struct device *etm_dev = &csdev->dev; > struct csdev_access *csa = &csdev->access; > > - CS_UNLOCK(drvdata->base); > + > + etm4_cs_unlock(drvdata, csa); > etm4_enable_arch_specific(drvdata); > > etm4_os_unlock(drvdata); > @@ -366,7 +382,7 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata) > isb(); > > done: > - CS_LOCK(drvdata->base); > + etm4_cs_lock(drvdata, csa); > > dev_dbg(etm_dev, "cpu: %d enable smp call done: %d\n", > drvdata->cpu, rc); > @@ -623,7 +639,7 @@ static void etm4_disable_hw(void *info) > struct csdev_access *csa = &csdev->access; > int i; > > - CS_UNLOCK(drvdata->base); > + etm4_cs_unlock(drvdata, csa); > etm4_disable_arch_specific(drvdata); > > if (!drvdata->skip_power_up) { > @@ -665,8 +681,7 @@ static void etm4_disable_hw(void *info) > } > > coresight_disclaim_device_unlocked(csdev); > - > - CS_LOCK(drvdata->base); > + etm4_cs_lock(drvdata, csa); > > dev_dbg(&drvdata->csdev->dev, > "cpu: %d disable smp call done\n", drvdata->cpu); > @@ -776,8 +791,7 @@ static void etm4_init_arch_data(void *info) > > /* Make sure all registers are accessible */ > etm4_os_unlock_csa(drvdata, csa); > - > - CS_UNLOCK(drvdata->base); > + etm4_cs_unlock(drvdata, csa); > > /* find all capabilities of the tracing unit */ > etmidr0 = etm4x_relaxed_read32(csa, TRCIDR0); > @@ -942,7 +956,7 @@ static void etm4_init_arch_data(void *info) > drvdata->nrseqstate = BMVAL(etmidr5, 25, 27); > /* NUMCNTR, bits[30:28] number of counters available for tracing */ > drvdata->nr_cntr = BMVAL(etmidr5, 28, 30); > - CS_LOCK(drvdata->base); > + etm4_cs_lock(drvdata, csa); > } > > /* Set ELx trace filter access in the TRCVICTLR register */ > @@ -1323,8 +1337,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata) > dsb(sy); > isb(); > > - CS_UNLOCK(drvdata->base); > - > + etm4_cs_unlock(drvdata, csa); > /* Lock the OS lock to disable trace and external debugger access */ > etm4_os_lock(drvdata); > > @@ -1437,7 +1450,7 @@ static int etm4_cpu_save(struct etmv4_drvdata *drvdata) > etm4x_relaxed_write32(csa, (state->trcpdcr & ~TRCPDCR_PU), > TRCPDCR); > out: > - CS_LOCK(drvdata->base); > + etm4_cs_lock(drvdata, csa); > return ret; > } > > @@ -1448,8 +1461,7 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata) > struct csdev_access tmp_csa = CSDEV_ACCESS_IOMEM(drvdata->base); > struct csdev_access *csa = &tmp_csa; > > - CS_UNLOCK(drvdata->base); > - > + etm4_cs_unlock(drvdata, csa); > etm4x_relaxed_write32(csa, state->trcclaimset, TRCCLAIMSET); > > etm4x_relaxed_write32(csa, state->trcprgctlr, TRCPRGCTLR); > @@ -1534,7 +1546,7 @@ static void etm4_cpu_restore(struct etmv4_drvdata *drvdata) > > /* Unlock the OS lock to re-enable trace and external debug access */ > etm4_os_unlock(drvdata); > - CS_LOCK(drvdata->base); > + etm4_cs_lock(drvdata, csa); > } > > static int etm4_cpu_pm_notify(struct notifier_block *nb, unsigned long cmd, > -- > 2.24.1 >
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