diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2021-02-09 08:24:36 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-03-04 17:36:58 -0500 |
| commit | cd4694756188dcca0f631e60da26053be1ffdc91 (patch) | |
| tree | acb67fa63ff2cd6fd946d12c68c7a0aa6c041ffc /drivers/scsi/ufs/ufs-debugfs.c | |
| parent | 37b97b18704f77f711e7a2c532fcad00268ac025 (diff) | |
scsi: ufs: ufs-debugfs: Add user-defined exception_event_mask
Allow users to enable specific exception events via debugfs.
The bits enabled by the driver ee_drv_ctrl are separated from the bits
enabled by the user ee_usr_ctrl. The control mask ee_mask_ctrl is the
logical-or of those two. A mutex is needed to ensure that the masks match
what was written to the device.
Link: https://lore.kernel.org/r/20210209062437.6954-4-adrian.hunter@intel.com
Acked-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs/ufs-debugfs.c')
| -rw-r--r-- | drivers/scsi/ufs/ufs-debugfs.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufs-debugfs.c b/drivers/scsi/ufs/ufs-debugfs.c index dee98dc72d29..59729073b569 100644 --- a/drivers/scsi/ufs/ufs-debugfs.c +++ b/drivers/scsi/ufs/ufs-debugfs.c @@ -44,10 +44,56 @@ static int ufs_debugfs_stats_show(struct seq_file *s, void *data) } DEFINE_SHOW_ATTRIBUTE(ufs_debugfs_stats); +static int ee_usr_mask_get(void *data, u64 *val) +{ + struct ufs_hba *hba = data; + + *val = hba->ee_usr_mask; + return 0; +} + +static int ufs_debugfs_get_user_access(struct ufs_hba *hba) +__acquires(&hba->host_sem) +{ + down(&hba->host_sem); + if (!ufshcd_is_user_access_allowed(hba)) { + up(&hba->host_sem); + return -EBUSY; + } + pm_runtime_get_sync(hba->dev); + return 0; +} + +static void ufs_debugfs_put_user_access(struct ufs_hba *hba) +__releases(&hba->host_sem) +{ + pm_runtime_put_sync(hba->dev); + up(&hba->host_sem); +} + +static int ee_usr_mask_set(void *data, u64 val) +{ + struct ufs_hba *hba = data; + int err; + + if (val & ~(u64)MASK_EE_STATUS) + return -EINVAL; + err = ufs_debugfs_get_user_access(hba); + if (err) + return err; + err = ufshcd_update_ee_usr_mask(hba, val, MASK_EE_STATUS); + ufs_debugfs_put_user_access(hba); + return err; +} + +DEFINE_DEBUGFS_ATTRIBUTE(ee_usr_mask_fops, ee_usr_mask_get, ee_usr_mask_set, "%#llx\n"); + void ufs_debugfs_hba_init(struct ufs_hba *hba) { hba->debugfs_root = debugfs_create_dir(dev_name(hba->dev), ufs_debugfs_root); debugfs_create_file("stats", 0400, hba->debugfs_root, hba, &ufs_debugfs_stats_fops); + debugfs_create_file("exception_event_mask", 0600, hba->debugfs_root, + hba, &ee_usr_mask_fops); } void ufs_debugfs_hba_exit(struct ufs_hba *hba) |