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-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etf.c2
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c12
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.c6
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.h4
4 files changed, 17 insertions, 7 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 466af86fd76f..e68289b8c072 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -48,6 +48,7 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
int i;
bufp = drvdata->buf;
+ drvdata->len = 0;
while (1) {
for (i = 0; i < drvdata->memwidth; i++) {
read_data = readl_relaxed(drvdata->base + TMC_RRD);
@@ -55,6 +56,7 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata)
return;
memcpy(bufp, &read_data, 4);
bufp += 4;
+ drvdata->len += 4;
}
}
}
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 688be9e060fc..03f36cb8b0c8 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -64,11 +64,17 @@ static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
rwp = readl_relaxed(drvdata->base + TMC_RWP);
val = readl_relaxed(drvdata->base + TMC_STS);
- /* How much memory do we still have */
- if (val & BIT(0))
+ /*
+ * Adjust the buffer to point to the beginning of the trace data
+ * and update the available trace data.
+ */
+ if (val & BIT(0)) {
drvdata->buf = drvdata->vaddr + rwp - drvdata->paddr;
- else
+ drvdata->len = drvdata->size;
+ } else {
drvdata->buf = drvdata->vaddr;
+ drvdata->len = rwp - drvdata->paddr;
+ }
}
static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 1b47258e01c9..b3275bb4d035 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -140,8 +140,8 @@ static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
struct tmc_drvdata, miscdev);
char *bufp = drvdata->buf + *ppos;
- if (*ppos + len > drvdata->size)
- len = drvdata->size - *ppos;
+ if (*ppos + len > drvdata->len)
+ len = drvdata->len - *ppos;
if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
if (bufp == (char *)(drvdata->vaddr + drvdata->size))
@@ -160,7 +160,7 @@ static ssize_t tmc_read(struct file *file, char __user *data, size_t len,
*ppos += len;
dev_dbg(drvdata->dev, "%s: %zu bytes copied, %d bytes left\n",
- __func__, len, (int)(drvdata->size - *ppos));
+ __func__, len, (int)(drvdata->len - *ppos));
return len;
}
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 5c5fe2ad2ca7..44b3ae346118 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -98,7 +98,8 @@ enum tmc_mem_intf_width {
* @buf: area of memory where trace data get sent.
* @paddr: DMA start location in RAM.
* @vaddr: virtual representation of @paddr.
- * @size: @buf size.
+ * @size: trace buffer size.
+ * @len: size of the available trace.
* @mode: how this TMC is being used.
* @config_type: TMC variant, must be of type @tmc_config_type.
* @memwidth: width of the memory interface databus, in bytes.
@@ -115,6 +116,7 @@ struct tmc_drvdata {
dma_addr_t paddr;
void __iomem *vaddr;
u32 size;
+ u32 len;
local_t mode;
enum tmc_config_type config_type;
enum tmc_mem_intf_width memwidth;