Messages in this thread | | | Date | Tue, 14 Aug 2018 11:40:36 -0600 | From | Mathieu Poirier <> | Subject | Re: [PATCH 06/13] coresight: etb10: Handle errors enabling the device |
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Hi Suzuki,
On Mon, Aug 06, 2018 at 02:41:48PM +0100, Suzuki K Poulose wrote: > Prepare the etb10 driver to return errors in enabling > the device. > > Cc: Mathieu Poirier <mathieu.poirier@linaro.org> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> > --- > drivers/hwtracing/coresight/coresight-etb10.c | 18 +++++++++++++----- > 1 file changed, 13 insertions(+), 5 deletions(-) > > diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c > index 9fd77fd..37d2c88 100644 > --- a/drivers/hwtracing/coresight/coresight-etb10.c > +++ b/drivers/hwtracing/coresight/coresight-etb10.c > @@ -107,7 +107,7 @@ static unsigned int etb_get_buffer_depth(struct etb_drvdata *drvdata) > return depth; > } > > -static void etb_enable_hw(struct etb_drvdata *drvdata) > +static void __etb_enable_hw(struct etb_drvdata *drvdata) > { > int i; > u32 depth; > @@ -135,6 +135,12 @@ static void etb_enable_hw(struct etb_drvdata *drvdata) > CS_LOCK(drvdata->base); > } > > +static int etb_enable_hw(struct etb_drvdata *drvdata) > +{ > + __etb_enable_hw(drvdata); > + return 0; > +} > + > static int etb_enable(struct coresight_device *csdev, u32 mode, void *data) > { > int ret = 0; > @@ -150,7 +156,7 @@ static int etb_enable(struct coresight_device *csdev, u32 mode, void *data) > if (mode == CS_MODE_PERF) { > ret = etb_set_buffer(csdev, (struct perf_output_handle *)data); > if (ret) > - goto out; > + return ret; > } > > val = local_cmpxchg(&drvdata->mode, > @@ -172,12 +178,14 @@ static int etb_enable(struct coresight_device *csdev, u32 mode, void *data) > goto out; > > spin_lock_irqsave(&drvdata->spinlock, flags); > - etb_enable_hw(drvdata); > + ret = etb_enable_hw(drvdata); > spin_unlock_irqrestore(&drvdata->spinlock, flags); > > -out: > - if (!ret) > + if (ret) > + local_cmpxchg(&drvdata->mode, mode, CS_MODE_DISABLED); > + else
I also have to do hackish things with my work on CPU-wide trace scenarios because drvdata->mode is of type local_t. Instead of living with it I'll send out a patch later today that moves it to a u32 like ETF and ETR.
Please look at it and if you're happy, add it to this patchset and do your modifications on top of it.
Thanks, Mathieu
> dev_dbg(drvdata->dev, "ETB enabled\n"); > + > return ret; > } > > -- > 2.7.4 >
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