Hi Mathieu,
On 2020-07-22 01:12, Mathieu Poirier wrote:
Hi Tingwei,
On Sun, Jul 19, 2020 at 02:27:12PM +0800, Tingwei Zhang wrote:
STP_PACKET_MARKED is not supported by STM currently. Add STM_FLAG_MARKED to support marked packet in STM.
Signed-off-by: Tingwei Zhang tingwei@codeaurora.org
drivers/hwtracing/coresight/coresight-stm.c | 11 +++++++---- include/uapi/linux/coresight-stm.h | 1 + 2 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-stm.c
b/drivers/hwtracing/coresight/coresight-stm.c
index b908ca104645..36fb1838b1d1 100644 --- a/drivers/hwtracing/coresight/coresight-stm.c +++ b/drivers/hwtracing/coresight/coresight-stm.c @@ -412,6 +412,7 @@ static ssize_t notrace stm_generic_packet(struct
stm_data *stm_data,
void __iomem *ch_addr; struct stm_drvdata *drvdata = container_of(stm_data, struct stm_drvdata,
stm);
unsigned int stm_flags;
if (!(drvdata && local_read(&drvdata->mode))) return -EACCES;
@@ -421,8 +422,10 @@ static ssize_t notrace stm_generic_packet(struct
stm_data *stm_data,
ch_addr = stm_channel_addr(drvdata, channel);
- flags = (flags == STP_PACKET_TIMESTAMPED) ? STM_FLAG_TIMESTAMPED :
0;
- flags |= test_bit(channel, drvdata->chs.guaranteed) ?
- stm_flags = (flags & STP_PACKET_TIMESTAMPED) ?
STM_FLAG_TIMESTAMPED : 0;- stm_flags |= (flags & STP_PACKET_MARKED) ? STM_FLAG_MARKED : 0;
Looking at the STM programmer's manual there is a marked area for data packets only. Clearing the marked bit for non-data access ends up in a reserved area and yet here it is set invariably.
Thanks. I'll fix that by set marked flag for data packet only.
Out of curiosity, what kind of use case are you using this for?
It's required for MIPI OST protocol.
Thanks, Tingwei
Thanks, Mathieu
stm_flags |= test_bit(channel, drvdata->chs.guaranteed) ? STM_FLAG_GUARANTEED : 0;
if (size > drvdata->write_bytes)
@@ -432,7 +435,7 @@ static ssize_t notrace stm_generic_packet(struct
stm_data *stm_data,
switch (packet) { case STP_PACKET_FLAG:
ch_addr += stm_channel_off(STM_PKT_TYPE_FLAG, flags);
ch_addr += stm_channel_off(STM_PKT_TYPE_FLAG, stm_flags);/*
- The generic STM core sets a size of '0' on flag
packets.
@@ -444,7 +447,7 @@ static ssize_t notrace stm_generic_packet(struct
stm_data *stm_data,
break;case STP_PACKET_DATA:
ch_addr += stm_channel_off(STM_PKT_TYPE_DATA, flags);
ch_addr += stm_channel_off(STM_PKT_TYPE_DATA, stm_flags);diff --git a/include/uapi/linux/coresight-stm.h
b/include/uapi/linux/coresight-stm.h
index 8847dbf24151..7ff3709c01b8 100644 --- a/include/uapi/linux/coresight-stm.h +++ b/include/uapi/linux/coresight-stm.h @@ -5,6 +5,7 @@ #include <linux/const.h>
#define STM_FLAG_TIMESTAMPED _BITUL(3) +#define STM_FLAG_MARKED _BITUL(4) #define STM_FLAG_GUARANTEED _BITUL(7)
/*
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