Add a read-only dev_usage sysfs attribute so userspace can query device
usage through sysfs. Patch 1 adds the attribute and the get_dev_usage
callback to the UACCE framework; patch 2 implements the callback in the
HiSilicon QM driver.

Changes in v2:
- Switch from qm_pm_get_sync() to hisi_qm_get_dfx_access() so that
  reading dev_usage does not wake a runtime-suspended device.  When
  suspended, 0 is reported for each channel without touching the
  hardware.
- Rename total_bw to max_bw in qm_usage_percent() and add a comment
  describing the channel-usage register layout to clarify the
  per-channel maximum semantics.

Weili Qian (2):
  uacce: add device usage sysfs interface
  crypto: hisilicon/qm - implement uacce get_dev_usage callback

 Documentation/ABI/testing/sysfs-driver-uacce |  9 +++
 drivers/crypto/hisilicon/debugfs.c           | 17 -----
 drivers/crypto/hisilicon/qm.c                | 66 ++++++++++++++++++++
 drivers/crypto/hisilicon/qm_common.h         |  1 +
 drivers/misc/uacce/uacce.c                   | 19 ++++++
 include/linux/uacce.h                        |  5 ++
 6 files changed, 100 insertions(+), 17 deletions(-)

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2.43.0