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Message-ID: <987a101d-043e-4893-89c0-f9fcd46b5aeb@arm.com>
Date: Tue, 19 Dec 2023 13:59:30 +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 2/8] coresight-tpda: Add support to configure CMB
element
On 18/12/2023 10:27, Suzuki K Poulose wrote:
> On 21/11/2023 02:24, Tao Zhang wrote:
>> Read the CMB element size from the device tree. Set the register
>> bit that controls the CMB element size of the corresponding port.
>>
>> Signed-off-by: Tao Zhang <quic_taozha@...cinc.com>
>> Signed-off-by: Mao Jinlong <quic_jinlmao@...cinc.com>
>> ---
>> drivers/hwtracing/coresight/coresight-tpda.c | 117 +++++++++++--------
>> drivers/hwtracing/coresight/coresight-tpda.h | 6 +
>> 2 files changed, 74 insertions(+), 49 deletions(-)
>>
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.c
>> b/drivers/hwtracing/coresight/coresight-tpda.c
>> index 5f82737c37bb..e3762f38abb3 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.c
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.c
>> @@ -28,24 +28,54 @@ static bool coresight_device_is_tpdm(struct
>> coresight_device *csdev)
>> CORESIGHT_DEV_SUBTYPE_SOURCE_TPDM);
>> }
>> +static void tpdm_clear_element_size(struct coresight_device *csdev)
>> +{
>> + struct tpda_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
>> +
>> + if (drvdata->dsb_esize)
>> + drvdata->dsb_esize = 0;
>> + if (drvdata->cmb_esize)
>> + drvdata->cmb_esize = 0;
>
> Why do we need the if (...) check here ?
>
>> +}
>> +
>> +static void tpda_set_element_size(struct tpda_drvdata *drvdata, u32
>> *val)
>> +{
>> +
>> + if (drvdata->dsb_esize == 64)
>> + *val |= TPDA_Pn_CR_DSBSIZE;
>> + else if (drvdata->dsb_esize == 32)
>> + *val &= ~TPDA_Pn_CR_DSBSIZE;
>> +
>> + if (drvdata->cmb_esize == 64)
>> + *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x2);
>> + else if (drvdata->cmb_esize == 32)
>> + *val |= FIELD_PREP(TPDA_Pn_CR_CMBSIZE, 0x1);
>> + else if (drvdata->cmb_esize == 8)
>> + *val &= ~TPDA_Pn_CR_CMBSIZE;
>> +}
>> +
>
>
>> /*
>> - * Read the DSB element size from the TPDM device
>> + * Read the element size from the TPDM device
>> * Returns
>> - * The dsb element size read from the devicetree if available.
>> + * The element size read from the devicetree if available.
>> * 0 - Otherwise, with a warning once.
>
> This doesn't match the function ? It return 0 on success and
> error (-EINVAL) on failure ?
>
>> */
>> -static int tpdm_read_dsb_element_size(struct coresight_device *csdev)
>> +static int tpdm_read_element_size(struct tpda_drvdata *drvdata,
>> + struct coresight_device *csdev)
>> {
>> - int rc = 0;
>> - u8 size = 0;
>> -
>> - rc = fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> - "qcom,dsb-element-size", &size);
>> + int rc = -EINVAL;
>> +
>> + if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> + "qcom,dsb-element-size", &drvdata->dsb_esize))
>> + rc = 0;
>> + if (!fwnode_property_read_u8(dev_fwnode(csdev->dev.parent),
>> + "qcom,cmb-element-size", &drvdata->cmb_esize))
At this point we have the csdev->dev.parent as the TPDM device and with:
#include <coresight-tpdm.h>
struct tpdm_drvdata *tpdm_data = get_drvdata(csdev->dev.parent);
if (tpdm_has_cmb(tpdm_data)) {
rc = fwnode_...(... "qcom,cmb-element-size"...)
}
if (tpdm_has_dsb(tpdm_data)) {
rc = fwnode_...(..., "qcom,dsb-element-size"..)
}
Suzuki
>> + rc = 0;
>
> Are we not silently resetting the error if the former failed ?
>
> Could we not :
>
> rc |= fwnode_...
>
> rc |= fwnode_...
>
> instead ?
>
> Also what is the expectation here ? Are these properties a MUST for
> TPDM ?
>
>> if (rc)
>> dev_warn_once(&csdev->dev,
>> - "Failed to read TPDM DSB Element size: %d\n", rc);
>> + "Failed to read TPDM Element size: %d\n", rc);
>> - return size;
>> + return rc;
>> }
>> /*
>> @@ -56,11 +86,12 @@ static int tpdm_read_dsb_element_size(struct
>> coresight_device *csdev)
>> * Parameter "inport" is used to pass in the input port number
>> * of TPDA, and it is set to -1 in the recursize call.
>> */
>> -static int tpda_get_element_size(struct coresight_device *csdev,
>> +static int tpda_get_element_size(struct tpda_drvdata *drvdata,
>> + struct coresight_device *csdev,
>> int inport)
>> {
>> - int dsb_size = -ENOENT;
>> - int i, size;
>> + int rc = 0;
>> + int i;
>> struct coresight_device *in;
>> for (i = 0; i < csdev->pdata->nr_inconns; i++) {
>> @@ -74,25 +105,21 @@ static int tpda_get_element_size(struct
>> coresight_device *csdev,
>> continue;
>> if (coresight_device_is_tpdm(in)) {
>> - size = tpdm_read_dsb_element_size(in);
>> + if ((drvdata->dsb_esize) || (drvdata->cmb_esize))
>> + return -EEXIST;
>> + rc = tpdm_read_element_size(drvdata, in);
>> + if (rc)
>> + return rc;
>> } else {
>> /* Recurse down the path */
>> - size = tpda_get_element_size(in, -1);
>> - }
>> -
>> - if (size < 0)
>> - return size;
>> -
>> - if (dsb_size < 0) {
>> - /* Found a size, save it. */
>> - dsb_size = size;
>> - } else {
>> - /* Found duplicate TPDMs */
>> - return -EEXIST;
>> + rc = tpda_get_element_size(drvdata, in, -1);
>> + if (rc)
>> + return rc;
>> }
>> }
>> - return dsb_size;
>> +
>> + return rc;
>> }
>> /* Settings pre enabling port control register */
>> @@ -109,7 +136,7 @@ static void tpda_enable_pre_port(struct
>> tpda_drvdata *drvdata)
>> static int tpda_enable_port(struct tpda_drvdata *drvdata, int port)
>> {
>> u32 val;
>> - int size;
>> + int rc;
>> val = readl_relaxed(drvdata->base + TPDA_Pn_CR(port));
>> /*
>> @@ -117,29 +144,21 @@ static int tpda_enable_port(struct tpda_drvdata
>> *drvdata, int port)
>> * Set the bit to 0 if the size is 32
>> * Set the bit to 1 if the size is 64
>> */
>> - size = tpda_get_element_size(drvdata->csdev, port);
>> - switch (size) {
>> - case 32:
>> - val &= ~TPDA_Pn_CR_DSBSIZE;
>> - break;
>> - case 64:
>> - val |= TPDA_Pn_CR_DSBSIZE;
>> - break;
>> - case 0:
>> - return -EEXIST;
>> - case -EEXIST:
>> + tpdm_clear_element_size(drvdata->csdev);
>> + rc = tpda_get_element_size(drvdata, drvdata->csdev, port);
>> + if (!rc && ((drvdata->dsb_esize) || (drvdata->cmb_esize))) {
>> + tpda_set_element_size(drvdata, &val);
>> + /* Enable the port */
>> + val |= TPDA_Pn_CR_ENA;
>> + writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> + } else if (rc == -EEXIST)
>> dev_warn_once(&drvdata->csdev->dev,
>> - "Detected multiple TPDMs on port %d", -EEXIST);
>> - return -EEXIST;
>> - default:
>> - return -EINVAL;
>> - }
>> -
>> - /* Enable the port */
>> - val |= TPDA_Pn_CR_ENA;
>> - writel_relaxed(val, drvdata->base + TPDA_Pn_CR(port));
>> + "Detected multiple TPDMs on port %d", -EEXIST);
>> + else
>> + dev_warn_once(&drvdata->csdev->dev,
>> + "Didn't find TPDM elem size");
>
> "element size"
>
>> - return 0;
>> + return rc;
>> }
>> static int __tpda_enable(struct tpda_drvdata *drvdata, int port)
>> diff --git a/drivers/hwtracing/coresight/coresight-tpda.h
>> b/drivers/hwtracing/coresight/coresight-tpda.h
>> index b3b38fd41b64..29164fd9711f 100644
>> --- a/drivers/hwtracing/coresight/coresight-tpda.h
>> +++ b/drivers/hwtracing/coresight/coresight-tpda.h
>> @@ -10,6 +10,8 @@
>> #define TPDA_Pn_CR(n) (0x004 + (n * 4))
>> /* Aggregator port enable bit */
>> #define TPDA_Pn_CR_ENA BIT(0)
>> +/* Aggregator port CMB data set element size bit */
>> +#define TPDA_Pn_CR_CMBSIZE GENMASK(7, 6)
>> /* Aggregator port DSB data set element size bit */
>> #define TPDA_Pn_CR_DSBSIZE BIT(8)
>> @@ -25,6 +27,8 @@
>> * @csdev: component vitals needed by the framework.
>> * @spinlock: lock for the drvdata value.
>> * @enable: enable status of the component.
>> + * @dsb_esize Record the DSB element size.
>> + * @cmb_esize Record the CMB element size.
>> */
>> struct tpda_drvdata {
>> void __iomem *base;
>> @@ -32,6 +36,8 @@ struct tpda_drvdata {
>> struct coresight_device *csdev;
>> spinlock_t spinlock;
>> u8 atid;
>> + u8 dsb_esize;
>> + u8 cmb_esize;
>> };
>> #endif /* _CORESIGHT_CORESIGHT_TPDA_H */
>
> Suzuki
>
>
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