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Date: Mon, 30 Oct 2017 15:44:03 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Suzuki K Poulose <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
rob.walker@....com, mike.leach@...aro.org,
coresight@...ts.linaro.org
Subject: Re: [PATCH 03/17] coresight: Add helper for inserting
synchronization packets
On Thu, Oct 19, 2017 at 06:15:39PM +0100, Suzuki K Poulose wrote:
> Right now we open code filling the trace buffer with synchronization
> packets when the circular buffer wraps around in different drivers.
> Move this to a common place.
>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Mike Leach <mike.leach@...aro.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
> drivers/hwtracing/coresight/coresight-etb10.c | 10 +++------
> drivers/hwtracing/coresight/coresight-priv.h | 8 ++++++++
> drivers/hwtracing/coresight/coresight-tmc-etf.c | 27 ++++++++-----------------
> drivers/hwtracing/coresight/coresight-tmc-etr.c | 13 +-----------
> 4 files changed, 20 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/hwtracing/coresight/coresight-etb10.c b/drivers/hwtracing/coresight/coresight-etb10.c
> index 56ecd7aff5eb..d7164ab8e229 100644
> --- a/drivers/hwtracing/coresight/coresight-etb10.c
> +++ b/drivers/hwtracing/coresight/coresight-etb10.c
> @@ -203,7 +203,6 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
> bool lost = false;
> int i;
> u8 *buf_ptr;
> - const u32 *barrier;
> u32 read_data, depth;
> u32 read_ptr, write_ptr;
> u32 frame_off, frame_endoff;
> @@ -234,19 +233,16 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
>
> depth = drvdata->buffer_depth;
> buf_ptr = drvdata->buf;
> - barrier = barrier_pkt;
> for (i = 0; i < depth; i++) {
> read_data = readl_relaxed(drvdata->base +
> ETB_RAM_READ_DATA_REG);
> - if (lost && *barrier) {
> - read_data = *barrier;
> - barrier++;
> - }
> -
> *(u32 *)buf_ptr = read_data;
> buf_ptr += 4;
> }
>
> + if (lost)
> + coresight_insert_barrier_packet(drvdata->buf);
> +
> if (frame_off) {
> buf_ptr -= (frame_endoff * 4);
> for (i = 0; i < frame_endoff; i++) {
> diff --git a/drivers/hwtracing/coresight/coresight-priv.h b/drivers/hwtracing/coresight/coresight-priv.h
> index f1d0e21d8cab..d12f64928c00 100644
> --- a/drivers/hwtracing/coresight/coresight-priv.h
> +++ b/drivers/hwtracing/coresight/coresight-priv.h
> @@ -65,6 +65,7 @@ static DEVICE_ATTR_RO(name)
> __coresight_simple_func(type, NULL, name, lo_off, hi_off)
>
> extern const u32 barrier_pkt[5];
> +#define CORESIGHT_BARRIER_PKT_SIZE (sizeof(barrier_pkt) - sizeof(u32))
When using a memcpy() there is no need to have a 0x0 at the end of the
barrier_pkt array. A such I suggest you remove that and simply use sizeof()
in coresight_insert_barrier_packet().
I'll review the rest of your patches tomorrow.
>
> enum etm_addr_type {
> ETM_ADDR_TYPE_NONE,
> @@ -98,6 +99,13 @@ struct cs_buffers {
> void **data_pages;
> };
>
> +static inline void coresight_insert_barrier_packet(void *buf)
> +{
> + if (buf)
> + memcpy(buf, barrier_pkt, CORESIGHT_BARRIER_PKT_SIZE);
> +}
> +
> +
> static inline void CS_LOCK(void __iomem *addr)
> {
> do {
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> index 0b6f1eb746de..d89bfb3042a2 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
> @@ -43,39 +43,28 @@ static void tmc_etb_enable_hw(struct tmc_drvdata *drvdata)
>
> static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
> {
> - bool lost = false;
> char *bufp;
> - const u32 *barrier;
> - u32 read_data, status;
> + u32 read_data, lost;
> int i;
>
> - /*
> - * Get a hold of the status register and see if a wrap around
> - * has occurred.
> - */
> - status = readl_relaxed(drvdata->base + TMC_STS);
> - if (status & TMC_STS_FULL)
> - lost = true;
> -
> + /* Check if the buffer was wrapped around. */
> + lost = readl_relaxed(drvdata->base + TMC_STS) & TMC_STS_FULL;
> bufp = drvdata->buf;
> drvdata->len = 0;
> - barrier = barrier_pkt;
> while (1) {
> for (i = 0; i < drvdata->memwidth; i++) {
> read_data = readl_relaxed(drvdata->base + TMC_RRD);
> if (read_data == 0xFFFFFFFF)
> - return;
> -
> - if (lost && *barrier) {
> - read_data = *barrier;
> - barrier++;
> - }
> -
> + goto done;
> memcpy(bufp, &read_data, 4);
> bufp += 4;
> drvdata->len += 4;
> }
> }
> +done:
> + if (lost)
> + coresight_insert_barrier_packet(drvdata->buf);
> + return;
> }
>
> static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
> diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> index 063f253f1c99..41535fa6b6cf 100644
> --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
> +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
> @@ -104,9 +104,7 @@ ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata,
>
> static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
> {
> - const u32 *barrier;
> u32 val;
> - u32 *temp;
> u64 rwp;
>
> rwp = tmc_read_rwp(drvdata);
> @@ -119,16 +117,7 @@ static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
> if (val & TMC_STS_FULL) {
> drvdata->buf = drvdata->vaddr + rwp - drvdata->paddr;
> drvdata->len = drvdata->size;
> -
> - barrier = barrier_pkt;
> - temp = (u32 *)drvdata->buf;
> -
> - while (*barrier) {
> - *temp = *barrier;
> - temp++;
> - barrier++;
> - }
> -
> + coresight_insert_barrier_packet(drvdata->buf);
> } else {
> drvdata->buf = drvdata->vaddr;
> drvdata->len = rwp - drvdata->paddr;
> --
> 2.13.6
>
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