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Message-ID: <185b23e7-a42f-4a12-85ba-8a093bc5ea58@arm.com>
Date: Mon, 18 Dec 2023 11:02:46 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: Tao Zhang <quic_taozha@...cinc.com>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Konrad Dybcio <konradybcio@...il.com>, Mike Leach <mike.leach@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Jinlong Mao <quic_jinlmao@...cinc.com>, Leo Yan <leo.yan@...aro.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>, coresight@...ts.linaro.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, Tingwei Zhang <quic_tingweiz@...cinc.com>,
Yuanfang Zhang <quic_yuanfang@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>, Song Chai <quic_songchai@...cinc.com>,
linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH v3 8/8] coresight-tpdm: Add msr register support for CMB
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@....com>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
> ---
> .../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@...cinc.com>, Tao Zhang (QUIC) <quic_taozha@...cinc.com>
> +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()
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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