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Message-ID: <f6565ae1-0955-d27c-a370-ea496aeb4ba8@arm.com>
Date: Wed, 6 Sep 2023 10:32:09 +0100
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>,
Hao Zhang <quic_hazha@...cinc.com>,
linux-arm-msm@...r.kernel.org, andersson@...nel.org
Subject: Re: [PATCH v8 13/13] coresight-tpdm: Add nodes for dsb msr support
On 22/08/2023 06:26, Tao Zhang wrote:
> Add the nodes for DSB subunit MSR(mux select register) support.
> The TPDM MSR (mux select register) interface is an optional
> interface and associated bank of registers per TPDM subunit.
> The intent of mux select registers is to control muxing structures
> driving the TPDM’s’ various subunit interfaces.
>
> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
> ---
> .../ABI/testing/sysfs-bus-coresight-devices-tpdm | 8 +++
> drivers/hwtracing/coresight/coresight-tpdm.c | 79 ++++++++++++++++++++++
> drivers/hwtracing/coresight/coresight-tpdm.h | 12 ++++
> 3 files changed, 99 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> index 46a5535..9b7e172 100644
> --- a/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> +++ b/Documentation/ABI/testing/sysfs-bus-coresight-devices-tpdm
> @@ -162,3 +162,11 @@ Description:
> Accepts only one of the 2 values - 0 or 1.
> 0 : Set the DSB pattern type to value.
> 1 : Set the DSB pattern type to toggle.
> +
> +What: /sys/bus/coresight/devices/<tpdm-name>/dsb_msr/msr[0:31]
> +Date: March 2023
> +KernelVersion 6.5
> +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 DSB subunit
> + TPDM.
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.c b/drivers/hwtracing/coresight/coresight-tpdm.c
> index 9b0e060..367c5e2 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.c
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.c
> @@ -51,6 +51,9 @@ static ssize_t tpdm_simple_dataset_show(struct device *dev,
> case DSB_PATT_MASK:
> return sysfs_emit(buf, "0x%x\n",
> drvdata->dsb->patt_mask[tpdm_attr->idx]);
> + case DSB_MSR:
> + return sysfs_emit(buf, "0x%x\n",
> + drvdata->dsb->msr[tpdm_attr->idx]);
> default:
> return -EINVAL;
> }
> @@ -84,6 +87,9 @@ static ssize_t tpdm_simple_dataset_store(struct device *dev,
> case DSB_PATT_MASK:
> drvdata->dsb->patt_mask[tpdm_attr->idx] = val;
> break;
> + case DSB_MSR:
> + drvdata->dsb->msr[tpdm_attr->idx] = val;
> + break;
> default:
> spin_unlock(&drvdata->spinlock);
> return -EINVAL;
> @@ -110,6 +116,22 @@ static umode_t tpdm_dsb_is_visible(struct kobject *kobj,
> return 0;
> }
>
> +static umode_t tpdm_dsb_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);
> +
> + if (drvdata && tpdm_has_dsb_dataset(drvdata)) {
> + of_property_read_u32(drvdata->dev->of_node,
> + "qcom,dsb_msr_num", &drvdata->dsb->msr_num);
Why don't we read this during probe and use that here ?
> + if (drvdata->dsb->msr_num != 0)
Also, could we not check the index of the attribute and make sure it is
available on this TPDM ?
attr->idx < drvdata->dsb->msr_num ??
> + return attr->mode;
> + }
> +
> + return 0;
> +}
> +
> static void tpdm_reset_datasets(struct tpdm_drvdata *drvdata)
> {
> if (tpdm_has_dsb_dataset(drvdata)) {
> @@ -162,6 +184,18 @@ static void set_dsb_tier(struct tpdm_drvdata *drvdata, u32 *val)
>
> }
>
> +static void set_dsb_msr(struct tpdm_drvdata *drvdata)
> +{
> + int i;
> +
> + if (drvdata->dsb->msr_num == 0)
> + return;
You don;t need this special case, the loop handles it
already
> +
> + for (i = 0; i < drvdata->dsb->msr_num; i++)
> + writel_relaxed(drvdata->dsb->msr[i],
> + drvdata->base + TPDM_DSB_MSR(i));
> +}
> +
> static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> {
> u32 val, i;
> @@ -186,6 +220,8 @@ static void tpdm_enable_dsb(struct tpdm_drvdata *drvdata)
> set_dsb_tier(drvdata, &val);
> writel_relaxed(val, drvdata->base + TPDM_DSB_TIER);
>
> + set_dsb_msr(drvdata);
> +
> val = readl_relaxed(drvdata->base + TPDM_DSB_CR);
> /* Set the mode of DSB dataset */
> set_dsb_mode(drvdata, &val);
> @@ -707,6 +743,42 @@ static struct attribute *tpdm_dsb_patt_attrs[] = {
> NULL,
> };
>
> +static struct attribute *tpdm_dsb_msr_attrs[] = {
> + DSB_MSR_ATTR(0),
> + DSB_MSR_ATTR(1),
> + DSB_MSR_ATTR(2),
> + DSB_MSR_ATTR(3),
> + DSB_MSR_ATTR(4),
> + DSB_MSR_ATTR(5),
> + DSB_MSR_ATTR(6),
> + DSB_MSR_ATTR(7),
> + DSB_MSR_ATTR(8),
> + DSB_MSR_ATTR(9),
> + DSB_MSR_ATTR(10),
> + DSB_MSR_ATTR(11),
> + DSB_MSR_ATTR(12),
> + DSB_MSR_ATTR(13),
> + DSB_MSR_ATTR(14),
> + DSB_MSR_ATTR(15),
> + DSB_MSR_ATTR(16),
> + DSB_MSR_ATTR(17),
> + DSB_MSR_ATTR(18),
> + DSB_MSR_ATTR(19),
> + DSB_MSR_ATTR(20),
> + DSB_MSR_ATTR(21),
> + DSB_MSR_ATTR(22),
> + DSB_MSR_ATTR(23),
> + DSB_MSR_ATTR(24),
> + DSB_MSR_ATTR(25),
> + DSB_MSR_ATTR(26),
> + DSB_MSR_ATTR(27),
> + DSB_MSR_ATTR(28),
> + DSB_MSR_ATTR(29),
> + DSB_MSR_ATTR(30),
> + DSB_MSR_ATTR(31),
> + NULL,
> +};
> +
> static struct attribute *tpdm_dsb_attrs[] = {
> &dev_attr_dsb_mode.attr,
> &dev_attr_dsb_patt_ts.attr,
> @@ -739,12 +811,19 @@ static struct attribute_group tpdm_dsb_patt_grp = {
> .name = "dsb_patt",
> };
>
> +static struct attribute_group tpdm_dsb_msr_grp = {
> + .attrs = tpdm_dsb_msr_attrs,
> + .is_visible = tpdm_dsb_msr_is_visible,
> + .name = "dsb_msr",
> +};
> +
> static const struct attribute_group *tpdm_attr_grps[] = {
> &tpdm_attr_grp,
> &tpdm_dsb_attrs_grp,
> &tpdm_dsb_edge_grp,
> &tpdm_dsb_trig_patt_grp,
> &tpdm_dsb_patt_grp,
> + &tpdm_dsb_msr_grp,
> NULL,
> };
>
> diff --git a/drivers/hwtracing/coresight/coresight-tpdm.h b/drivers/hwtracing/coresight/coresight-tpdm.h
> index 9173e80..270e946 100644
> --- a/drivers/hwtracing/coresight/coresight-tpdm.h
> +++ b/drivers/hwtracing/coresight/coresight-tpdm.h
> @@ -18,6 +18,7 @@
> #define TPDM_DSB_XPMR(n) (0x7E8 + (n * 4))
> #define TPDM_DSB_EDCR(n) (0x808 + (n * 4))
> #define TPDM_DSB_EDCMR(n) (0x848 + (n * 4))
> +#define TPDM_DSB_MSR(n) (0x980 + (n * 4))
>
> /* Enable bit for DSB subunit */
> #define TPDM_DSB_CR_ENA BIT(0)
> @@ -90,6 +91,8 @@
> #define TPDM_DSB_MAX_EDCMR 8
> /* MAX number of DSB pattern */
> #define TPDM_DSB_MAX_PATT 8
> +/* MAX number of DSB MSR */
> +#define TPDM_DSB_MAX_MSR 32
>
> #define tpdm_simple_dataset_ro(name, mem, idx, max) \
> (&((struct tpdm_dataset_attribute[]) { \
> @@ -136,16 +139,22 @@
> tpdm_simple_dataset_rw(tpmr##nr, \
> DSB_PATT_MASK, nr, TPDM_DSB_MAX_PATT)
>
> +#define DSB_MSR_ATTR(nr) \
> + tpdm_simple_dataset_rw(msr##nr, \
> + DSB_MSR, nr, TPDM_DSB_MAX_MSR)
> +
> /**
> * struct dsb_dataset - specifics associated to dsb dataset
> * @mode: DSB programming mode
> * @edge_ctrl_idx Index number of the edge control
> + * @msr_num Number of MSR supported by DSB TPDM
> * @edge_ctrl: Save value for edge control
> * @edge_ctrl_mask: Save value for edge control mask
> * @patt_val: Save value for pattern
> * @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: Enable/Disable pattern timestamp
> * @patt_type: Set pattern type
> * @trig_ts: Enable/Disable trigger timestamp.
> @@ -154,12 +163,14 @@
> struct dsb_dataset {
> u32 mode;
> u32 edge_ctrl_idx;
> + u32 msr_num;
Why should this be part of the dataset ? If I remember correctly,
this data structure is zeroed on reset via sysfs ? Shouldn't that
be part of the drvdata-> instead ? So that you read it once during
probe and don't mess with it.
Suzuki
> u32 edge_ctrl[TPDM_DSB_MAX_EDCR];
> u32 edge_ctrl_mask[TPDM_DSB_MAX_EDCMR];
> u32 patt_val[TPDM_DSB_MAX_PATT];
> u32 patt_mask[TPDM_DSB_MAX_PATT];
> u32 trig_patt[TPDM_DSB_MAX_PATT];
> u32 trig_patt_mask[TPDM_DSB_MAX_PATT];
> + u32 msr[TPDM_DSB_MAX_MSR];
> bool patt_ts;
> bool patt_type;
> bool trig_ts;
> @@ -195,6 +206,7 @@ enum dataset_mem {
> DSB_TRIG_PATT_MASK,
> DSB_PATT,
> DSB_PATT_MASK,
> + DSB_MSR,
> };
>
> /**
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