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Message-ID: <bcb2c1a7-c588-2f83-51ae-5685c9387797@linaro.org>
Date: Thu, 12 Mar 2020 11:38:08 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Avi Shchislowski <avi.shchislowski@....com>,
Avri Altman <Avri.Altman@....com>,
Guenter Roeck <linux@...ck-us.net>,
Alim Akhtar <alim.akhtar@...sung.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
Zhang Rui <rui.zhang@...el.com>, linux-kernel@...r.kernel.org
Cc: Avi Shchislowski <avi.shchislowski@...disk.com>
Subject: Re: [RESEND PATCH 1/5] scsi: ufs: Add ufs thermal support
On 23/02/2020 10:35, Avi Shchislowski wrote:
> From: Avi Shchislowski <avi.shchislowski@...disk.com>
>
> Support the new temperature notification attributes introduced in
> UFSv3.0. Add exception event mask, and ufs features attributes.
>
> Signed-off-by: Avi Shchislowski <avi.shchislowski@...disk.com>
> ---
> drivers/scsi/ufs/Kconfig | 11 ++++
> drivers/scsi/ufs/Makefile | 1 +
> drivers/scsi/ufs/ufs-thermal.c | 123 +++++++++++++++++++++++++++++++++++++++++
Why not put the driver under drivers/thermal/ ?
> drivers/scsi/ufs/ufs-thermal.h | 19 +++++++
> drivers/scsi/ufs/ufs.h | 11 ++++
> drivers/scsi/ufs/ufshcd.c | 3 +
> drivers/scsi/ufs/ufshcd.h | 10 ++++
> 7 files changed, 178 insertions(+)
> create mode 100644 drivers/scsi/ufs/ufs-thermal.c
> create mode 100644 drivers/scsi/ufs/ufs-thermal.h
>
> diff --git a/drivers/scsi/ufs/Kconfig b/drivers/scsi/ufs/Kconfig
> index d14c224..bed56ee 100644
> --- a/drivers/scsi/ufs/Kconfig
> +++ b/drivers/scsi/ufs/Kconfig
> @@ -160,3 +160,14 @@ config SCSI_UFS_BSG
>
> Select this if you need a bsg device node for your UFS controller.
> If unsure, say N.
> +
> +config THERMAL_UFS
> + bool "Thermal UFS"
> + depends on THERMAL && SCSI_UFSHCD
> + help
> + A UFS3.0 feature that allows using the ufs device as a temperature
> + sensor. it provide notification to the host when the UFS device
> + case temperature approaches its pre-defined boundaries.
> +
> + Select Y to enable this feature, otherwise say N.
> + If unsure, say N.
> \ No newline at end of file
^^^^
> diff --git a/drivers/scsi/ufs/Makefile b/drivers/scsi/ufs/Makefile
> index 94c6c5d..fd35941 100644
> --- a/drivers/scsi/ufs/Makefile
> +++ b/drivers/scsi/ufs/Makefile
> @@ -12,3 +12,4 @@ obj-$(CONFIG_SCSI_UFSHCD_PLATFORM) += ufshcd-pltfrm.o
> obj-$(CONFIG_SCSI_UFS_HISI) += ufs-hisi.o
> obj-$(CONFIG_SCSI_UFS_MEDIATEK) += ufs-mediatek.o
> obj-$(CONFIG_SCSI_UFS_TI_J721E) += ti-j721e-ufs.o
> +obj-$(CONFIG_THERMAL_UFS) += ufs-thermal.o
> diff --git a/drivers/scsi/ufs/ufs-thermal.c b/drivers/scsi/ufs/ufs-thermal.c
> new file mode 100644
> index 0000000..469c1ed
> --- /dev/null
> +++ b/drivers/scsi/ufs/ufs-thermal.c
> @@ -0,0 +1,123 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * thermal ufs
> + *
> + * Copyright (C) 2020 Western Digital Corporation
> + */
> +#include <linux/thermal.h>
> +#include "ufs-thermal.h"
> +
> +enum {
> + UFS_THERM_MAX_TEMP,
> + UFS_THERM_HIGH_TEMP,
> + UFS_THERM_LOW_TEMP,
> + UFS_THERM_MIN_TEMP,
> +
> + /* keep last */
> + UFS_THERM_MAX_TRIPS
> +};
> +
> +/**
> + *struct ufs_thermal - thermal zone related data
> + * @tzone: thermal zone device data
> + */
> +static struct ufs_thermal {
> + struct thermal_zone_device *zone;
> +} thermal;
> +
> +static struct thermal_zone_device_ops ufs_thermal_ops = {
> + .get_temp = NULL,
> + .get_trip_temp = NULL,
> + .get_trip_type = NULL,
> +};
Can you merge all the patches related to this driver into a single one?
> +static int ufs_thermal_enable_ee(struct ufs_hba *hba)
> +{
> + /* later */
> + return -EINVAL;
> +}
> +
> +static void ufs_thermal_zone_unregister(struct ufs_hba *hba)
> +{
> + if (thermal.zone) {
> + dev_dbg(hba->dev, "Thermal zone device unregister\n");
> + thermal_zone_device_unregister(thermal.zone);
> + thermal.zone = NULL;
> + }
> +}
> +
> +static int ufs_thermal_register(struct ufs_hba *hba)
> +{
> + int err = 0;
> + char name[THERMAL_NAME_LENGTH] = {};
> +
> + snprintf(name, THERMAL_NAME_LENGTH, "ufs_storage_%d",
> + hba->host->host_no);
> +
> + thermal.zone = thermal_zone_device_register(name, UFS_THERM_MAX_TRIPS,
> + 0, hba, &ufs_thermal_ops, NULL, 0, 0);
> + if (IS_ERR(thermal.zone)) {
> + err = PTR_ERR(thermal.zone);
> + dev_err(hba->dev, "Failed to register to thermal zone, err %d\n",
> + err);
> + thermal.zone = NULL;
> + goto out;
> + }
It is pointless to reassign thermal.zone to NULL.
As there is no rollback involved here, This can be simplified to:
if (IS_ERR(thermal.zone)) {
dev_err(hba->dev, "...");
return PTR_ERR(thermal.zone);
}
> +
> + /* thermal support is enabled only after successful
nit: comment format
/*
* thermal support ...
* ...
*/
> + * enablement of thermal exception
> + */
> + if (ufs_thermal_enable_ee(hba)) {
> + dev_info(hba->dev, "Failed to enable thermal exception\n");
> + ufs_thermal_zone_unregister(hba);
> + err = -EINVAL;
> + }
err = ufs_thermal_enable_ee(hba);
if (err) {
...
return err;
}
return 0;
> +
> +out:
> + return err;
> +}
> +
> +int ufs_thermal_probe(struct ufs_hba *hba)
> +{
> + u8 ufs_features;
> + u8 *desc_buf = NULL;
> + int err = -EINVAL;
> +
> + if (!ufshcd_thermal_management_enabled(hba))
> + goto out;
> +
> + desc_buf = kzalloc(hba->desc_size.dev_desc, GFP_KERNEL);
> + if (!desc_buf) {
> + err = -ENOMEM;
> + goto out;
> + }
> +
> + if (ufshcd_read_desc_param(hba, QUERY_DESC_IDN_DEVICE, 0, 0, desc_buf,
> + hba->desc_size.dev_desc))
> + goto out;
> +
> +
> + ufs_features = desc_buf[DEVICE_DESC_PARAM_UFS_FEAT] &
> + (UFS_FEATURE_HTEMP | UFS_FEATURE_LTEMP);
> + if (!ufs_features)
> + goto out;
> +
> + err = ufs_thermal_register(hba);
> + if (err)
> + goto out;
> +
> + hba->thermal_features = ufs_features;
> +
> +out:
> + kfree(desc_buf);
> + return err;
> +}
> +
> +void ufs_thermal_remove(struct ufs_hba *hba)
> +{
> + if (!ufshcd_thermal_management_enabled(hba))
> + return;
> +
> + ufs_thermal_zone_unregister(hba);
> + hba->thermal_features = 0;
Why is this needed ?
> +}
> diff --git a/drivers/scsi/ufs/ufs-thermal.h b/drivers/scsi/ufs/ufs-thermal.h
> new file mode 100644
> index 0000000..7c0fcbe
> --- /dev/null
> +++ b/drivers/scsi/ufs/ufs-thermal.h
> @@ -0,0 +1,19 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2018 Western Digital Corporation
> + */
> +#ifndef UFS_THERMAL_H
> +#define UFS_THERMAL_H
> +
> +#include "ufshcd.h"
> +#include "ufs.h"
> +
> +#ifdef CONFIG_THERMAL_UFS
> +void ufs_thermal_remove(struct ufs_hba *hba);
> +int ufs_thermal_probe(struct ufs_hba *hba);
> +#else
> +static inline void ufs_thermal_remove(struct ufs_hba *hba) {}
> +static inline int ufs_thermal_probe(struct ufs_hba *hba) {return 0; }
> +#endif /* CONFIG_THERMAL_UFS */
> +
> +#endif /* UFS_THERMAL_H */
> diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
> index dde2eb0..eb729cc 100644
> --- a/drivers/scsi/ufs/ufs.h
> +++ b/drivers/scsi/ufs/ufs.h
> @@ -332,6 +332,17 @@ enum {
> UFSHCD_AMP = 3,
> };
>
> +/* UFS Features - to decode bUFSFeaturesSupport */
> +enum {
> + UFS_FEATURE_FFU = BIT(0),
> + UFS_FEATURE_PSA = BIT(1),
> + UFS_FEATURE_LIFE = BIT(2),
> + UFS_FEATURE_REFRESH = BIT(3),
> + UFS_FEATURE_HTEMP = BIT(4),
> + UFS_FEATURE_LTEMP = BIT(5),
> + UFS_FEATURE_ETEMP = BIT(6),
> +};
> +
> #define POWER_DESC_MAX_SIZE 0x62
> #define POWER_DESC_MAX_ACTV_ICC_LVLS 16
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
> index abd0e6b..099d2de 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -47,6 +47,7 @@
> #include "unipro.h"
> #include "ufs-sysfs.h"
> #include "ufs_bsg.h"
> +#include "ufs-thermal.h"
>
> #define CREATE_TRACE_POINTS
> #include <trace/events/ufs.h>
> @@ -7111,6 +7112,7 @@ static int ufshcd_probe_hba(struct ufs_hba *hba, bool async)
>
> /* Enable Auto-Hibernate if configured */
> ufshcd_auto_hibern8_enable(hba);
> + ufs_thermal_probe(hba);
>
> out:
>
> @@ -8278,6 +8280,7 @@ int ufshcd_shutdown(struct ufs_hba *hba)
> */
> void ufshcd_remove(struct ufs_hba *hba)
> {
> + ufs_thermal_remove(hba);
> ufs_bsg_remove(hba);
> ufs_sysfs_remove_nodes(hba->dev);
> blk_cleanup_queue(hba->tmf_queue);
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
> index 2ae6c7c..28c0063 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -730,6 +730,11 @@ struct ufs_hba {
>
> struct device bsg_dev;
> struct request_queue *bsg_queue;
> +
> +#define UFSHCD_CAP_THERMAL_MANAGEMENT (1 << 7)
> +
> + u8 thermal_features;
> +
> };
>
> /* Returns true if clocks can be gated. Otherwise false */
> @@ -754,6 +759,11 @@ static inline bool ufshcd_is_rpm_autosuspend_allowed(struct ufs_hba *hba)
> return hba->caps & UFSHCD_CAP_RPM_AUTOSUSPEND;
> }
>
> +static inline bool ufshcd_thermal_management_enabled(struct ufs_hba *hba)
> +{
> + return hba->caps & UFSHCD_CAP_THERMAL_MANAGEMENT;
> +}
> +
> static inline bool ufshcd_is_intr_aggr_allowed(struct ufs_hba *hba)
> {
> /* DWC UFS Core has the Interrupt aggregation feature but is not detectable*/
>
--
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