Re: [PATCH v3 8/8] coresight-tpdm: Add msr register support for CMB
From: Tao Zhang
Date: Wed Dec 20 2023 - 04:07:33 EST
On 12/19/2023 10:09 PM, Suzuki K Poulose wrote:
On 19/12/2023 06:58, Tao Zhang wrote:
On 12/18/2023 7:02 PM, Suzuki K Poulose wrote:
On 21/11/2023 02:24, Tao Zhang wrote:
Add the nodes for CMB subunit MSR(mux select register) support.
CMB MSRs(mux select registers) is to separate mux,arbitration,
,interleaving,data packing control from stream filtering control.
Reviewed-by: James Clark <james.clark@xxxxxxx>
Signed-off-by: Tao Zhang <quic_taozha@xxxxxxxxxxx>
Signed-off-by: Mao Jinlong <quic_jinlmao@xxxxxxxxxxx>
---
.../testing/sysfs-bus-coresight-devices-tpdm | 8 ++
drivers/hwtracing/coresight/coresight-tpdm.c | 86
+++++++++++++++++++
drivers/hwtracing/coresight/coresight-tpdm.h | 16 +++-
3 files changed, 109 insertions(+), 1 deletion(-)
diff --git
a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
index e0b77107be13..914f3fd81525 100644
--- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
+++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
@@ -249,3 +249,11 @@ Description:
Accepts only one of the 2 values - 0 or 1.
0 : Disable the timestamp of all trace packets.
1 : Enable the timestamp of all trace packets.
+
+What: /sys/bus/coresight/devices/<tpdm-name>/cmb_msr/msr[0:31]
+Date: September 2023
+KernelVersion 6.7
+Contact: Jinlong Mao (QUIC) <quic_jinlmao@xxxxxxxxxxx>, Tao
Zhang (QUIC) <quic_taozha@xxxxxxxxxxx>
+Description:
+ (RW) Set/Get the MSR(mux select register) for the CMB subunit
+ TPDM.
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c
b/drivers/hwtracing/coresight/coresight-tpdm.c
index f6cda5616e84..7e331ea436cc 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.c
+++ b/drivers/hwtracing/coresight/coresight-tpdm.c
@@ -86,6 +86,11 @@ static ssize_t tpdm_simple_dataset_show(struct
device *dev,
return -EINVAL;
return sysfs_emit(buf, "0x%x\n",
drvdata->cmb->patt_mask[tpdm_attr->idx]);
+ case CMB_MSR:
+ if (tpdm_attr->idx >= drvdata->cmb_msr_num)
+ return -EINVAL;
+ return sysfs_emit(buf, "0x%x\n",
+ drvdata->cmb->msr[tpdm_attr->idx]);
}
return -EINVAL;
}
@@ -162,6 +167,12 @@ static ssize_t
tpdm_simple_dataset_store(struct device *dev,
else
ret = -EINVAL;
break;
+ case CMB_MSR:
+ if (tpdm_attr->idx < drvdata->cmb_msr_num)
+ drvdata->cmb->msr[tpdm_attr->idx] = val;
+ else
+ ret = -EINVAL;
minor nit: Could we not break from here instead of adding return
-EINVAL
for each case ? (I understand it has been done for the existing cases.
But I think we should clean up all of that, including the ones you
added
in Patch 5. Similarly for the dataset_show()
Sure, do I also need to change the DSB corresponding code? If so, how
about
if I add a new patch to the next patch series to change the previous
existing cases?
You could fix the existing cases as a preparatory patch of the next
version of this series. I can pick it up and push it to next as I see
fit.
Got it. I will update this to the next patch series.
Best,
Tao
Suzuki
Best,
Tao
Suzuki
+ break;
default:
ret = -EINVAL;
}
@@ -220,6 +231,23 @@ static umode_t tpdm_dsb_msr_is_visible(struct
kobject *kobj,
return 0;
}
+static umode_t tpdm_cmb_msr_is_visible(struct kobject *kobj,
+ struct attribute *attr, int n)
+{
+ struct device *dev = kobj_to_dev(kobj);
+ struct tpdm_drvdata *drvdata = dev_get_drvdata(dev->parent);
+
+ struct device_attribute *dev_attr =
+ container_of(attr, struct device_attribute, attr);
+ struct tpdm_dataset_attribute *tpdm_attr =
+ container_of(dev_attr, struct tpdm_dataset_attribute, attr);
+
+ if (tpdm_attr->idx < drvdata->cmb_msr_num)
+ return attr->mode;
+
+ return 0;
+}
+
static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
{
if (tpdm_has_dsb_dataset(drvdata)) {
@@ -361,6 +389,15 @@ static void set_cmb_tier(struct tpdm_drvdata
*drvdata)
writel_relaxed(val, drvdata->base + TPDM_CMB_TIER);
}
+static void set_cmb_msr(struct tpdm_drvdata *drvdata)
+{
+ int i;
+
+ for (i = 0; i < drvdata->cmb_msr_num; i++)
+ writel_relaxed(drvdata->cmb->msr[i],
+ drvdata->base + TPDM_CMB_MSR(i));
+}
+
static void tpdm_enable_cmb(struct tpdm_drvdata *drvdata)
{
u32 val, i;
@@ -379,6 +416,8 @@ static void tpdm_enable_cmb(struct tpdm_drvdata
*drvdata)
set_cmb_tier(drvdata);
+ set_cmb_msr(drvdata);
+
val = readl_relaxed(drvdata->base + TPDM_CMB_CR);
/*
* Set to 0 for continuous CMB collection mode,
@@ -1084,6 +1123,42 @@ static struct attribute
*tpdm_cmb_patt_attrs[] = {
NULL,
};
+static struct attribute *tpdm_cmb_msr_attrs[] = {
+ CMB_MSR_ATTR(0),
+ CMB_MSR_ATTR(1),
+ CMB_MSR_ATTR(2),
+ CMB_MSR_ATTR(3),
+ CMB_MSR_ATTR(4),
+ CMB_MSR_ATTR(5),
+ CMB_MSR_ATTR(6),
+ CMB_MSR_ATTR(7),
+ CMB_MSR_ATTR(8),
+ CMB_MSR_ATTR(9),
+ CMB_MSR_ATTR(10),
+ CMB_MSR_ATTR(11),
+ CMB_MSR_ATTR(12),
+ CMB_MSR_ATTR(13),
+ CMB_MSR_ATTR(14),
+ CMB_MSR_ATTR(15),
+ CMB_MSR_ATTR(16),
+ CMB_MSR_ATTR(17),
+ CMB_MSR_ATTR(18),
+ CMB_MSR_ATTR(19),
+ CMB_MSR_ATTR(20),
+ CMB_MSR_ATTR(21),
+ CMB_MSR_ATTR(22),
+ CMB_MSR_ATTR(23),
+ CMB_MSR_ATTR(24),
+ CMB_MSR_ATTR(25),
+ CMB_MSR_ATTR(26),
+ CMB_MSR_ATTR(27),
+ CMB_MSR_ATTR(28),
+ CMB_MSR_ATTR(29),
+ CMB_MSR_ATTR(30),
+ CMB_MSR_ATTR(31),
+ NULL,
+};
+
static struct attribute *tpdm_dsb_attrs[] = {
&dev_attr_dsb_mode.attr,
&dev_attr_dsb_trig_ts.attr,
@@ -1144,6 +1219,12 @@ static struct attribute_group
tpdm_cmb_patt_grp = {
.name = "cmb_patt",
};
+static struct attribute_group tpdm_cmb_msr_grp = {
+ .attrs = tpdm_cmb_msr_attrs,
+ .is_visible = tpdm_cmb_msr_is_visible,
+ .name = "cmb_msr",
+};
+
static const struct attribute_group *tpdm_attr_grps[] = {
&tpdm_attr_grp,
&tpdm_dsb_attr_grp,
@@ -1154,6 +1235,7 @@ static const struct attribute_group
*tpdm_attr_grps[] = {
&tpdm_cmb_attr_grp,
&tpdm_cmb_trig_patt_grp,
&tpdm_cmb_patt_grp,
+ &tpdm_cmb_msr_grp,
NULL,
};
@@ -1192,6 +1274,10 @@ static int tpdm_probe(struct amba_device
*adev, const struct amba_id *id)
of_property_read_u32(drvdata->dev->of_node,
"qcom,dsb-msrs-num", &drvdata->dsb_msr_num);
+ if (drvdata && tpdm_has_cmb_dataset(drvdata))
+ of_property_read_u32(drvdata->dev->of_node,
+ "qcom,cmb-msrs-num", &drvdata->cmb_msr_num);
+
/* Set up coresight component description */
desc.name = coresight_alloc_device_name(&tpdm_devs, dev);
if (!desc.name)
diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h
b/drivers/hwtracing/coresight/coresight-tpdm.h
index 65b7ca6c4077..255104d024ab 100644
--- a/drivers/hwtracing/coresight/coresight-tpdm.h
+++ b/drivers/hwtracing/coresight/coresight-tpdm.h
@@ -21,6 +21,8 @@
#define TPDM_CMB_XPR(n) (0xA18 + (n * 4))
/*CMB subunit trigger pattern mask registers*/
#define TPDM_CMB_XPMR(n) (0xA20 + (n * 4))
+/* CMB MSR register */
+#define TPDM_CMB_MSR(n) (0xA80 + (n * 4))
/* Enable bit for CMB subunit */
#define TPDM_CMB_CR_ENA BIT(0)
@@ -36,6 +38,9 @@
/*Patten register number*/
#define TPDM_CMB_MAX_PATT 2
+/* MAX number of DSB MSR */
+#define TPDM_CMB_MAX_MSR 32
+
/* DSB Subunit Registers */
#define TPDM_DSB_CR (0x780)
#define TPDM_DSB_TIER (0x784)
@@ -186,6 +191,10 @@
tpdm_simple_dataset_rw(tpmr##nr, \
CMB_PATT_MASK, nr)
+#define CMB_MSR_ATTR(nr) \
+ tpdm_simple_dataset_rw(msr##nr, \
+ CMB_MSR, nr)
+
/**
* struct dsb_dataset - specifics associated to dsb dataset
* @mode: DSB programming mode
@@ -225,6 +234,7 @@ struct dsb_dataset {
* @patt_mask: Save value for pattern mask
* @trig_patt: Save value for trigger pattern
* @trig_patt_mask: Save value for trigger pattern mask
+ * @msr Save value for MSR
* @patt_ts: Indicates if pattern match for timestamp is
enabled.
* @trig_ts: Indicates if CTI trigger for timestamp is
enabled.
* @ts_all: Indicates if timestamp is enabled for all
packets.
@@ -235,6 +245,7 @@ struct cmb_dataset {
u32 patt_mask[TPDM_CMB_MAX_PATT];
u32 trig_patt[TPDM_CMB_MAX_PATT];
u32 trig_patt_mask[TPDM_CMB_MAX_PATT];
+ u32 msr[TPDM_CMB_MAX_MSR];
bool patt_ts;
bool trig_ts;
bool ts_all;
@@ -251,6 +262,7 @@ struct cmb_dataset {
* @dsb Specifics associated to TPDM DSB.
* @cmb Specifics associated to TPDM CMB.
* @dsb_msr_num Number of MSR supported by DSB TPDM
+ * @cmb_msr_num Number of MSR supported by CMB TPDM
*/
struct tpdm_drvdata {
@@ -263,6 +275,7 @@ struct tpdm_drvdata {
struct dsb_dataset *dsb;
struct cmb_dataset *cmb;
u32 dsb_msr_num;
+ u32 cmb_msr_num;
};
/* Enumerate members of various datasets */
@@ -277,7 +290,8 @@ enum dataset_mem {
CMB_TRIG_PATT,
CMB_TRIG_PATT_MASK,
CMB_PATT,
- CMB_PATT_MASK
+ CMB_PATT_MASK,
+ CMB_MSR
};
/**
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