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| author | Avri Altman <avri.altman@wdc.com> | 2018-10-07 16:30:37 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-10-11 05:09:46 +0200 |
| commit | 5e0a86eed84607432436766e3e1bb37f8318f7b2 (patch) | |
| tree | 957b78c37518c0123094352d69a7a827c31143be /drivers/scsi/ufs/ufshcd.h | |
| parent | scsi: ufs: Use data structure size in pointer arithmetic (diff) | |
| download | linux-5e0a86eed84607432436766e3e1bb37f8318f7b2.tar.xz linux-5e0a86eed84607432436766e3e1bb37f8318f7b2.zip | |
scsi: ufs: Add API to execute raw upiu commands
The UFS host software uses a combination of a host register set and
Transfer Request Descriptors in system memory to communicate with host
controller hardware. In its mmio space, a separate places are assigned
to UTP Transfer Request Descriptor ("utrd") list, and to UTP Task
Management Request Descriptor ("utmrd") list.
The provided API supports utrd-typed requests: nop out and device
management commands. It also supports utmrd-type requests:
task management requests. Other UPIU types are not supported for now.
We utilize the already existing code for tag and task work queues.
That is, all utrd-typed UPIUs are "disguised" as device management
commands. Similarly, the utmrd-typed UPUIs uses the task management
infrastructure.
It is up to the caller to fill the upiu request properly, as it will be
copied without any further input validations.
Signed-off-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <Bart.VanAssche@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs/ufshcd.h')
| -rw-r--r-- | drivers/scsi/ufs/ufshcd.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 54e6fe87954f..087813417a71 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -895,6 +895,13 @@ int ufshcd_map_desc_id_to_length(struct ufs_hba *hba, enum desc_idn desc_id, u32 ufshcd_get_local_unipro_ver(struct ufs_hba *hba); +int ufshcd_exec_raw_upiu_cmd(struct ufs_hba *hba, + struct utp_upiu_req *req_upiu, + struct utp_upiu_req *rsp_upiu, + int msgcode, + u8 *desc_buff, int *buff_len, + enum query_opcode desc_op); + /* Wrapper functions for safely calling variant operations */ static inline const char *ufshcd_get_var_name(struct ufs_hba *hba) { |