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coresight: tmc: Limit the trace to available data

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At present the ETF or ETR gives out the entire device
buffer, even if there is less or even no trace data
available. This patch limits the trace data given out to
the actual trace data collected.

Cc: mathieu.poirier@linaro.org
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2016-08-25 15:18:57 -06:00 committed by Greg Kroah-Hartman
parent 068c0a542f
commit 8505feaed9
4 changed files with 17 additions and 7 deletions
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2
drivers/hwtracing/coresight/coresight-tmc-etf.c
View file

@ -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;
}
}
}

12
drivers/hwtracing/coresight/coresight-tmc-etr.c
View file

@ -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)

6
drivers/hwtracing/coresight/coresight-tmc.c
View file

@ -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;
}

4
drivers/hwtracing/coresight/coresight-tmc.h
View file

@ -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;