diff options
| author | Martin K. Petersen <martin.petersen@oracle.com> | 2024-05-30 20:36:08 -0400 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2024-05-30 20:36:08 -0400 |
| commit | 23646f013404a69e2cc5b1be51eef67e720d7021 (patch) | |
| tree | c5c1e214ada3e74af18ff4a37f82902464386aa7 /include | |
| parent | 96281dfa266d333522c004205acc5ff1e9e3a337 (diff) | |
| parent | 600edc6620a4380b9f6027f293dac09eb0f22048 (diff) | |
Merge patch series "scsi: ufs: Allow RTT negotiation"
Avri Altman <avri.altman@wdc.com> says:
The rtt-upiu packets precede any data-out upiu packets, thus synchronizing
the data input to the device: this mostly applies to write operations, but
there are other operations that requires rtt as well.
There are several rules binding this rtt - data-out dialog, specifically
There can be at most outstanding bMaxNumOfRTT such packets. This might
have an effect on write performance (sequential write in particular), as
each data-out upiu must wait for its rtt sibling.
UFSHCI expects bMaxNumOfRTT to be min(bDeviceRTTCap, NORTT). However, as of
today, there does not appear to be no-one who sets it: not the host
controller nor the driver. It wasn't an issue up to now: bMaxNumOfRTT is
set to 2 after manufacturing, and wasn't limiting the write performance.
UFS4.0, and specifically gear 5 changes this, and requires the device to be
more attentive. This doesn't come free - the device has to allocate more
resources to that end, but the sequential write performance improvement is
significant. Early measurements shows 25% gain when moving from rtt 2 to
9. Therefore, set bMaxNumOfRTT to be min(bDeviceRTTCap, NORTT) as UFSHCI
expects.
Link: https://lore.kernel.org/r/20240530142510.734-1-avri.altman@wdc.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/ufs/ufs.h | 2 | ||||
| -rw-r--r-- | include/ufs/ufshcd.h | 4 | ||||
| -rw-r--r-- | include/ufs/ufshci.h | 1 |
3 files changed, 7 insertions, 0 deletions
diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h index b6003749bc83..853e95957c31 100644 --- a/include/ufs/ufs.h +++ b/include/ufs/ufs.h @@ -592,6 +592,8 @@ struct ufs_dev_info { enum ufs_rtc_time rtc_type; time64_t rtc_time_baseline; u32 rtc_update_period; + + u8 rtt_cap; /* bDeviceRTTCap */ }; /* diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index bad88bd91995..ef04ec8aad69 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -295,6 +295,7 @@ struct ufs_pwr_mode_info { /** * struct ufs_hba_variant_ops - variant specific callbacks * @name: variant name + * @max_num_rtt: maximum RTT supported by the host * @init: called when the driver is initialized * @exit: called to cleanup everything done in init * @get_ufs_hci_version: called to get UFS HCI version @@ -332,6 +333,7 @@ struct ufs_pwr_mode_info { */ struct ufs_hba_variant_ops { const char *name; + int max_num_rtt; int (*init)(struct ufs_hba *); void (*exit)(struct ufs_hba *); u32 (*get_ufs_hci_version)(struct ufs_hba *); @@ -819,6 +821,7 @@ enum ufshcd_mcq_opr { * @capabilities: UFS Controller Capabilities * @mcq_capabilities: UFS Multi Circular Queue capabilities * @nutrs: Transfer Request Queue depth supported by controller + * @nortt - Max outstanding RTTs supported by controller * @nutmrs: Task Management Queue depth supported by controller * @reserved_slot: Used to submit device commands. Protected by @dev_cmd.lock. * @ufs_version: UFS Version to which controller complies @@ -957,6 +960,7 @@ struct ufs_hba { u32 capabilities; int nutrs; + int nortt; u32 mcq_capabilities; int nutmrs; u32 reserved_slot; diff --git a/include/ufs/ufshci.h b/include/ufs/ufshci.h index 385e1c6b8d60..c50f92bf2e1d 100644 --- a/include/ufs/ufshci.h +++ b/include/ufs/ufshci.h @@ -68,6 +68,7 @@ enum { /* Controller capability masks */ enum { MASK_TRANSFER_REQUESTS_SLOTS = 0x0000001F, + MASK_NUMBER_OUTSTANDING_RTT = 0x0000FF00, MASK_TASK_MANAGEMENT_REQUEST_SLOTS = 0x00070000, MASK_EHSLUTRD_SUPPORTED = 0x00400000, MASK_AUTO_HIBERN8_SUPPORT = 0x00800000, |