On Wed, Jun 28, 2023 at 12:00:38AM +0530, Badal Nilawar wrote:
> The xe HWMON module will be used to expose voltage, power and energy
> values for dGfx. Here we set up xe hwmon infrastructure including xe
> hwmon registration, basic data structures and functions.
> This is port from i915 hwmon.
>
> v2: Fix review comments (Riana)
>
> Signed-off-by: Badal Nilawar <badal.nilawar@xxxxxxxxx>
> ---
> drivers/gpu/drm/xe/Makefile | 3 +
> drivers/gpu/drm/xe/xe_device.c | 5 ++
> drivers/gpu/drm/xe/xe_device_types.h | 2 +
> drivers/gpu/drm/xe/xe_hwmon.c | 116 +++++++++++++++++++++++++++
> drivers/gpu/drm/xe/xe_hwmon.h | 22 +++++
> 5 files changed, 148 insertions(+)
> create mode 100644 drivers/gpu/drm/xe/xe_hwmon.c
> create mode 100644 drivers/gpu/drm/xe/xe_hwmon.h
>
> diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
> index 4b82cb2773ad..e39d77037622 100644
> --- a/drivers/gpu/drm/xe/Makefile
> +++ b/drivers/gpu/drm/xe/Makefile
> @@ -113,6 +113,9 @@ xe-y += xe_bb.o \
> xe_wa.o \
> xe_wopcm.o
>
> +# graphics hardware monitoring (HWMON) support
> +xe-$(CONFIG_HWMON) += xe_hwmon.o
> +
> # i915 Display compat #defines and #includes
> subdir-ccflags-$(CONFIG_DRM_XE_DISPLAY) += \
> -I$(srctree)/$(src)/display/ext \
> diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
> index c7985af85a53..0fcd60037d66 100644
> --- a/drivers/gpu/drm/xe/xe_device.c
> +++ b/drivers/gpu/drm/xe/xe_device.c
> @@ -34,6 +34,7 @@
> #include "xe_vm.h"
> #include "xe_vm_madvise.h"
> #include "xe_wait_user_fence.h"
> +#include "xe_hwmon.h"
>
> static int xe_file_open(struct drm_device *dev, struct drm_file *file)
> {
> @@ -328,6 +329,8 @@ int xe_device_probe(struct xe_device *xe)
>
> xe_debugfs_register(xe);
>
> + xe_hwmon_register(xe);
> +
> err = drmm_add_action_or_reset(&xe->drm, xe_device_sanitize, xe);
> if (err)
> return err;
> @@ -354,6 +357,8 @@ static void xe_device_remove_display(struct xe_device *xe)
>
> void xe_device_remove(struct xe_device *xe)
> {
> + xe_hwmon_unregister(xe);
> +
> xe_device_remove_display(xe);
>
> xe_display_unlink(xe);
> diff --git a/drivers/gpu/drm/xe/xe_device_types.h b/drivers/gpu/drm/xe/xe_device_types.h
> index 0226d44a6af2..21bff0e610a1 100644
> --- a/drivers/gpu/drm/xe/xe_device_types.h
> +++ b/drivers/gpu/drm/xe/xe_device_types.h
> @@ -332,6 +332,8 @@ struct xe_device {
> /** @d3cold_allowed: Indicates if d3cold is a valid device state */
> bool d3cold_allowed;
>
> + struct xe_hwmon *hwmon;
> +
You likely need a 'struct xe_hwmon' forward declaration at the top of
the file.
> /* private: */
>
> #if IS_ENABLED(CONFIG_DRM_XE_DISPLAY)
> diff --git a/drivers/gpu/drm/xe/xe_hwmon.c b/drivers/gpu/drm/xe/xe_hwmon.c
> new file mode 100644
> index 000000000000..8f653fdf4ad5
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_hwmon.c
> @@ -0,0 +1,116 @@
> +// SPDX-License-Identifier: MIT
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#include <linux/hwmon.h>
> +
> +#include "regs/xe_gt_regs.h"
> +#include "xe_device.h"
> +#include "xe_hwmon.h"
> +
> +struct hwm_drvdata {
> + struct xe_hwmon *hwmon;
> + struct device *hwmon_dev;
> + char name[12];
> +};
> +
> +struct xe_hwmon {
> + struct hwm_drvdata ddat;
> + struct mutex hwmon_lock;
> +};
> +
These two structures look very goofy, e.g. why two 2 structs instead of
1, why a back pointer in 'struct hwm_drvdata' rather than using
container_of? Just make this one structure?
> +static const struct hwmon_channel_info *hwm_info[] = {
> + NULL
> +};
> +
> +static umode_t
> +hwm_is_visible(const void *drvdata, enum hwmon_sensor_types type,
Nit and matter of opinion but...
s/hwm_is_visible/xe_hwmon_is_visible
> + u32 attr, int channel)
> +{
> + switch (type) {
> + default:
> + return 0;
> + }
> +}
> +
> +static int
> +hwm_read(struct device *dev, enum hwmon_sensor_types type, u32 attr,
> + int channel, long *val)
s/hwm_read/xe_hwmon_read
> +{
> + switch (type) {
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static int
> +hwm_write(struct device *dev, enum hwmon_sensor_types type, u32 attr,
> + int channel, long val)
> +{
s/hwm_write/xe_hwmon_write
> + switch (type) {
> + default:
> + return -EOPNOTSUPP;
> + }
> +}
> +
> +static const struct hwmon_ops hwm_ops = {
s/hwm_ops/xe_hwmon_ops
> + .is_visible = hwm_is_visible,
> + .read = hwm_read,
> + .write = hwm_write,
> +};
> +
> +static const struct hwmon_chip_info hwm_chip_info = {
s/hwm_chip_info/xe_hwmon_chip_info
> + .ops = &hwm_ops,
> + .info = hwm_info,
> +};
> +
> +static void
> +hwm_get_preregistration_info(struct xe_device *xe)
> +{
> +}
> +
> +void xe_hwmon_register(struct xe_device *xe)
> +{
> + struct device *dev = xe->drm.dev;
> + struct xe_hwmon *hwmon;
> + struct device *hwmon_dev;
> + struct hwm_drvdata *ddat;
> +
> + /* hwmon is available only for dGfx */
> + if (!IS_DGFX(xe))
> + return;
> +
> + hwmon = devm_kzalloc(dev, sizeof(*hwmon), GFP_KERNEL);
> + if (!hwmon)
> + return;
> +
> + xe->hwmon = hwmon;
> + mutex_init(&hwmon->hwmon_lock);
drmm_mutex_init
Matt
> + ddat = &hwmon->ddat;
> +
> + ddat->hwmon = hwmon;
> + snprintf(ddat->name, sizeof(ddat->name), "xe");
> +
> + hwm_get_preregistration_info(xe);
> +
> + drm_dbg(&xe->drm, "Register HWMON interface\n");
> +
> + /* hwmon_dev points to device hwmon<i> */
> + hwmon_dev = devm_hwmon_device_register_with_info(dev, ddat->name,
> + ddat,
> + &hwm_chip_info,
> + NULL);
> + if (IS_ERR(hwmon_dev)) {
> + drm_warn(&xe->drm, "Fail to register xe hwmon\n");
> + xe->hwmon = NULL;
> + return;
> + }
> +
> + ddat->hwmon_dev = hwmon_dev;
> +}
> +
> +void xe_hwmon_unregister(struct xe_device *xe)
> +{
> + xe->hwmon = NULL;
> +}
> diff --git a/drivers/gpu/drm/xe/xe_hwmon.h b/drivers/gpu/drm/xe/xe_hwmon.h
> new file mode 100644
> index 000000000000..a078eeb0a68b
> --- /dev/null
> +++ b/drivers/gpu/drm/xe/xe_hwmon.h
> @@ -0,0 +1,22 @@
> +/* SPDX-License-Identifier: MIT */
> +
> +/*
> + * Copyright © 2023 Intel Corporation
> + */
> +
> +#ifndef __XE_HWMON_H__
> +#define __XE_HWMON_H__
> +
> +#include <linux/types.h>
> +
> +struct xe_device;
> +
> +#if IS_REACHABLE(CONFIG_HWMON)
> +void xe_hwmon_register(struct xe_device *xe);
> +void xe_hwmon_unregister(struct xe_device *xe);
> +#else
> +static inline void xe_hwmon_register(struct xe_device *xe) { };
> +static inline void xe_hwmon_unregister(struct xe_device *xe) { };
> +#endif
> +
> +#endif /* __XE_HWMON_H__ */
> --
> 2.25.1
>
