On 2022/2/7 19:49, Jonathan Cameron wrote:
> On Mon, 24 Jan 2022 21:11:14 +0800
> Yicong Yang <yangyicong@xxxxxxxxxxxxx> wrote:
>
>> Add tune function for the HiSilicon Tune and Trace device. The interface
>> of tune is exposed through sysfs attributes of PTT PMU device.
>>
>> Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx>
>
> A few trivial things inline, but looks good in general to me.
> With those tidied up
> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
>
Thanks for the comments.
>
>> ---
>> drivers/hwtracing/ptt/hisi_ptt.c | 154 +++++++++++++++++++++++++++++++
>> drivers/hwtracing/ptt/hisi_ptt.h | 19 ++++
>> 2 files changed, 173 insertions(+)
>>
>> diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
>> index 2994354e690b..b11e702eb506 100644
>> --- a/drivers/hwtracing/ptt/hisi_ptt.c
>> +++ b/drivers/hwtracing/ptt/hisi_ptt.c
>> @@ -21,6 +21,159 @@
>>
>> #include "hisi_ptt.h"
>>
>> +static int hisi_ptt_wait_tuning_finish(struct hisi_ptt *hisi_ptt)
>> +{
>> + u32 val;
>> +
>> + return readl_poll_timeout(hisi_ptt->iobase + HISI_PTT_TUNING_INT_STAT,
>> + val, !(val & HISI_PTT_TUNING_INT_STAT_MASK),
>> + HISI_PTT_WAIT_POLL_INTERVAL_US,
>> + HISI_PTT_WAIT_TIMEOUT_US);
>> +}
>> +
>> +static int hisi_ptt_tune_data_get(struct hisi_ptt *hisi_ptt,
>> + u32 event, u16 *data)
>> +{
>> + u32 reg;
>> +
>> + reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
>> + reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
>> + reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
>> + event);
>> + writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
>> +
>> + /* Write all 1 to indicates it's the read process */
>> + writel(~0UL, hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
>
> Just to check, this is includes the bits above the DATA_VAL_MASK?
> Fine if so, just seems odd to define a field but then write
> parts of the register that aren't part of that field.
>
yes. The valid data field is [0,15]. But
all 1 is used here to indicate that it's a
read process rather than a write process.
>> +
>> + if (hisi_ptt_wait_tuning_finish(hisi_ptt))
>> + return -ETIMEDOUT;
>> +
>> + reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
>> + reg &= HISI_PTT_TUNING_DATA_VAL_MASK;
>> + *data = (u16)reg;
>
> As below, prefer a FIELD_GET() for this.
>
sure. will use field ops here and below.
Thanks.
>> +
>> + return 0;
>> +}
>> +
>> +static int hisi_ptt_tune_data_set(struct hisi_ptt *hisi_ptt,
>> + u32 event, u16 data)
>> +{
>> + u32 reg;
>> +
>> + reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
>> + reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
>> + reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
>> + event);
>> + writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
>> +
>> + reg = data;
> Given you defined HISI_PTT_TUNING_DATA_VAL_MASK why not use it here
>
> writel(FIELD_PREP(..), ...)?
>
>> + writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
>> +
>> + if (hisi_ptt_wait_tuning_finish(hisi_ptt))
>> + return -ETIMEDOUT;
>> +
>> + return 0;
>> +}
>> +
>
>
> .
>
