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Date: Thu, 19 Oct 2017 18:15:39 +0100
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, rob.walker@....com,
mike.leach@...aro.org, coresight@...ts.linaro.org,
mathieu.poirier@...aro.org,
Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH 03/17] coresight: Add helper for inserting synchronization packets
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))
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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