mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-16 07:51:31 -04:00
Code Issues Packages Projects Releases Wiki Activity

coresight: tpda: add logic to configure TPDA_SYNCR register

Browse Source 
The TPDA_SYNC counter tracks the number of bytes transferred from the
aggregator. When this count reaches the value programmed in the
TPDA_SYNCR register, an ASYNC request is triggered, allowing userspace
tools to accurately parse each valid packet.

Signed-off-by: Tao Zhang <tao.zhang@oss.qualcomm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Co-developed-by: Jie Gan <jie.gan@oss.qualcomm.com>
Signed-off-by: Jie Gan <jie.gan@oss.qualcomm.com>
[ Fix kernel version in Documentation ]
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20251223-add_sysfs_nodes_to_configure_tpda-v8-3-4c95db608b62@oss.qualcomm.com
This commit is contained in:
Tao Zhang
2025-12-23 18:09:52 +08:00
committed by Suzuki K Poulose
parent 8e1c358a3b
commit 33f04ead7c
3 changed files with 118 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
Documentation/ABI/testing/sysfs-bus-coresight-devices-tpda
View File

@@ -41,3 +41,21 @@ Contact: Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qu
Description:
(RW) Set global (all ports) flush request bit. The bit remains set until a
global flush request sequence completes.
What: /sys/bus/coresight/devices/<tpda-name>/syncr_mode
Date: December 2025
KernelVersion: 6.20
Contact: Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qualcomm.com>, Jie Gan <jie.gan@oss.qualcomm.com>
Description:
(RW) Set mode the of the syncr counter.
mode 0 - COUNT[11:0] value represents the approximate number of bytes moved between two ASYNC packet requests
mode 1 - the bits COUNT[11:7] are used as a power of 2. for example, we could insert an async packet every 8K
data by writing a value 13 to the COUNT[11:7] field.
What: /sys/bus/coresight/devices/<tpda-name>/syncr_count
Date: December 2025
KernelVersion: 6.20
Contact: Jinlong Mao <jinlong.mao@oss.qualcomm.com>, Tao Zhang <tao.zhang@oss.qualcomm.com>, Jie Gan <jie.gan@oss.qualcomm.com>
Description:
(RW) Set value the of the syncr counter.
Range: 0-4095

90
drivers/hwtracing/coresight/coresight-tpda.c
View File

@@ -163,6 +163,20 @@ static void tpda_enable_pre_port(struct tpda_drvdata *drvdata)
*/
if (drvdata->trig_flag_ts)
writel_relaxed(0x0, drvdata->base + TPDA_FPID_CR);
/* Initialize with a value of 0 */
val = 0;
if (drvdata->syncr_mode)
val |= TPDA_SYNCR_MODE_CTRL_MASK;
if (drvdata->syncr_count > 0 &&
drvdata->syncr_count < TPDA_SYNCR_COUNT_MASK)
val |= drvdata->syncr_count;
else
/* Program the count to its MAX value by default */
val |= TPDA_SYNCR_COUNT_MASK;
writel_relaxed(val, drvdata->base + TPDA_SYNCR);
}
static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
@@ -385,8 +399,84 @@ static ssize_t global_flush_req_store(struct device *dev,
}
static DEVICE_ATTR_RW(global_flush_req);
static ssize_t syncr_mode_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val, syncr_val;
if (!drvdata->csdev->refcnt)
return -EINVAL;
guard(spinlock)(&drvdata->spinlock);
syncr_val = readl_relaxed(drvdata->base + TPDA_SYNCR);
val = FIELD_GET(TPDA_SYNCR_MODE_CTRL_MASK, syncr_val);
return sysfs_emit(buf, "%lu\n", val);
}
static ssize_t syncr_mode_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t size)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
guard(spinlock)(&drvdata->spinlock);
/* set the mode when first enabling the device */
drvdata->syncr_mode = !!val;
return size;
}
static DEVICE_ATTR_RW(syncr_mode);
static ssize_t syncr_count_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val;
if (!drvdata->csdev->refcnt)
return -EINVAL;
guard(spinlock)(&drvdata->spinlock);
val = readl_relaxed(drvdata->base + TPDA_SYNCR);
val &= TPDA_SYNCR_COUNT_MASK;
return sysfs_emit(buf, "%lu\n", val);
}
static ssize_t syncr_count_store(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t size)
{
struct tpda_drvdata *drvdata = dev_get_drvdata(dev->parent);
unsigned long val;
if (kstrtoul(buf, 0, &val))
return -EINVAL;
if (val > TPDA_SYNCR_COUNT_MASK)
return -EINVAL;
guard(spinlock)(&drvdata->spinlock);
drvdata->syncr_count = val;
return size;
}
static DEVICE_ATTR_RW(syncr_count);
static struct attribute *tpda_attrs[] = {
&dev_attr_global_flush_req.attr,
&dev_attr_syncr_mode.attr,
&dev_attr_syncr_count.attr,
tpda_trig_sysfs_rw(freq_ts_enable, FREQTS),
tpda_trig_sysfs_rw(trig_freq_enable, FRIE),
tpda_trig_sysfs_rw(trig_flag_ts_enable, FLRIE),

10
drivers/hwtracing/coresight/coresight-tpda.h
View File

@@ -9,6 +9,7 @@
#define TPDA_CR (0x000)
#define TPDA_Pn_CR(n) (0x004 + (n * 4))
#define TPDA_FPID_CR (0x084)
#define TPDA_SYNCR (0x08C)
/* Cross trigger global (all ports) flush request bit */
#define TPDA_CR_FLREQ BIT(0)
@@ -36,6 +37,11 @@
/* Aggregator port DSB data set element size bit */
#define TPDA_Pn_CR_DSBSIZE BIT(8)
/* TPDA_SYNCR count mask */
#define TPDA_SYNCR_COUNT_MASK GENMASK(11, 0)
/* TPDA_SYNCR mode control bit */
#define TPDA_SYNCR_MODE_CTRL_MASK GENMASK(12, 12)
#define TPDA_MAX_INPORTS 32
/**
@@ -52,6 +58,8 @@
* @trig_freq: Enable/disable cross trigger FREQ packet request interface.
* @freq_ts: Enable/disable the timestamp for all FREQ packets.
* @cmbchan_mode: Configure the CMB/MCMB channel mode.
* @syncr_mode: Setting the mode for counting packets.
* @syncr_count: Setting the value of the count.
*/
struct tpda_drvdata {
void __iomem *base;
@@ -66,6 +74,8 @@ struct tpda_drvdata {
bool trig_freq;
bool freq_ts;
bool cmbchan_mode;
bool syncr_mode;
u32 syncr_count;
};
/* Enumerate members of global control register(cr) */