diff options
| author | Tomas Winkler <tomas.winkler@intel.com> | 2018-07-31 09:35:34 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-02 10:18:30 +0200 |
| commit | ee7aba5aba70dd98fc05697723167ebb858e7aba (patch) | |
| tree | dc0ef153c71bfdfbfe2694d4d68ae09fc3b84026 /drivers/misc | |
| parent | 98e70866aacb1fcaa7b710fc6bca9862bf47421a (diff) | |
| download | linux-ee7aba5aba70dd98fc05697723167ebb858e7aba.tar.bz2 | |
mei: hbm: define dma ring setup protocol
The protocol defines how to setup an I/O ring on top of host
memory to utilize the device DMA engine for faster transport.
Three memory buffers are allocated.
A Host circular buffer for from the Host to Device communication.
A Device circular buffer for from Device to the Host communication.
And finally a Control block where the pointers for the both
circular buffers are managed.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/mei/hw.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/misc/mei/hw.h b/drivers/misc/mei/hw.h index 3b325d955fbe..76fb502e6f71 100644 --- a/drivers/misc/mei/hw.h +++ b/drivers/misc/mei/hw.h @@ -122,6 +122,9 @@ #define MEI_HBM_NOTIFY_RES_CMD 0x90 #define MEI_HBM_NOTIFICATION_CMD 0x11 +#define MEI_HBM_DMA_SETUP_REQ_CMD 0x12 +#define MEI_HBM_DMA_SETUP_RES_CMD 0x92 + /* * MEI Stop Reason * used by hbm_host_stop_request.reason @@ -449,4 +452,50 @@ struct hbm_notification { u8 reserved[1]; } __packed; +/** + * struct hbm_dma_mem_dscr - dma ring + * + * @addr_hi: the high 32bits of 64 bit address + * @addr_lo: the low 32bits of 64 bit address + * @size : size in bytes (must be power of 2) + */ +struct hbm_dma_mem_dscr { + u32 addr_hi; + u32 addr_lo; + u32 size; +} __packed; + +enum { + DMA_DSCR_HOST = 0, + DMA_DSCR_DEVICE = 1, + DMA_DSCR_CTRL = 2, + DMA_DSCR_NUM, +}; + +/** + * struct hbm_dma_setup_request - dma setup request + * + * @hbm_cmd: bus message command header + * @reserved: reserved for alignment + * @dma_dscr: dma descriptor for HOST, DEVICE, and CTRL + */ +struct hbm_dma_setup_request { + u8 hbm_cmd; + u8 reserved[3]; + struct hbm_dma_mem_dscr dma_dscr[DMA_DSCR_NUM]; +} __packed; + +/** + * struct hbm_dma_setup_response - dma setup response + * + * @hbm_cmd: bus message command header + * @status: 0 on success; otherwise DMA setup failed. + * @reserved: reserved for alignment + */ +struct hbm_dma_setup_response { + u8 hbm_cmd; + u8 status; + u8 reserved[2]; +} __packed; + #endif |