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coresight: tmc: set buffer size to 32MB on SW USB mode

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We are using memory as buffer for SW USB mode. Too small
buffer could cause packet drop issue. Always set ETR
buffer to 32MB on SW USB mode to resolve this issue.

Change-Id: I222152f15c5cc61141b9a9eb18c1b2bb19714174
Signed-off-by: Tingwei Zhang <tingwei@codeaurora.org>
This commit is contained in:
Tingwei Zhang 2020-05-22 19:25:26 +08:00
commit 11e9935ab1
1 changed files with 8 additions and 1 deletions
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9
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@ -45,6 +45,9 @@ struct etr_perf_buffer {
/* Lower limit for ETR hardware buffer */
#define TMC_ETR_PERF_MIN_BUF_SIZE SZ_1M
/* SW USB reserved memory size */
#define TMC_ETR_SW_USB_BUF_SIZE SZ_32M
/*
* The TMC ETR SG has a page size of 4K. The SG table contains pointers
* to 4KB buffers. However, the OS may use a PAGE_SIZE different from
@ -1082,7 +1085,11 @@ ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata,
static struct etr_buf *
tmc_etr_setup_sysfs_buf(struct tmc_drvdata *drvdata)
{
return tmc_alloc_etr_buf(drvdata, drvdata->size,
if (drvdata->byte_cntr->sw_usb)
return tmc_alloc_etr_buf(drvdata, TMC_ETR_SW_USB_BUF_SIZE,
0, cpu_to_node(0), NULL);
else
return tmc_alloc_etr_buf(drvdata, drvdata->size,
0, cpu_to_node(0), NULL);
}