Release 4.7 drivers/scsi/isci/unsolicited_frame_control.h
/*
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* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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#ifndef _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_
#define _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_
#include "isci.h"
#define SCU_UNSOLICITED_FRAME_HEADER_DATA_DWORDS 15
/**
* struct scu_unsolicited_frame_header -
*
* This structure delineates the format of an unsolicited frame header. The
* first DWORD are UF attributes defined by the silicon architecture. The data
* depicts actual header information received on the link.
*/
struct scu_unsolicited_frame_header {
/**
* This field indicates if there is an Initiator Index Table entry with
* which this header is associated.
*/
u32 iit_exists:1;
/**
* This field simply indicates the protocol type (i.e. SSP, STP, SMP).
*/
u32 protocol_type:3;
/**
* This field indicates if the frame is an address frame (IAF or OAF)
* or if it is a information unit frame.
*/
u32 is_address_frame:1;
/**
* This field simply indicates the connection rate at which the frame
* was received.
*/
u32 connection_rate:4;
u32 reserved:23;
/**
* This field represents the actual header data received on the link.
*/
u32 data[SCU_UNSOLICITED_FRAME_HEADER_DATA_DWORDS];
};
/**
* enum unsolicited_frame_state -
*
* This enumeration represents the current unsolicited frame state. The
* controller object can not updtate the hardware unsolicited frame put pointer
* unless it has already processed the priror unsolicited frames.
*/
enum unsolicited_frame_state {
/**
* This state is when the frame is empty and not in use. It is
* different from the released state in that the hardware could DMA
* data to this frame buffer.
*/
UNSOLICITED_FRAME_EMPTY,
/**
* This state is set when the frame buffer is in use by by some
* object in the system.
*/
UNSOLICITED_FRAME_IN_USE,
/**
* This state is set when the frame is returned to the free pool
* but one or more frames prior to this one are still in use.
* Once all of the frame before this one are freed it will go to
* the empty state.
*/
UNSOLICITED_FRAME_RELEASED,
UNSOLICITED_FRAME_MAX_STATES
};
/**
* struct sci_unsolicited_frame -
*
* This is the unsolicited frame data structure it acts as the container for
* the current frame state, frame header and frame buffer.
*/
struct sci_unsolicited_frame {
/**
* This field contains the current frame state
*/
enum unsolicited_frame_state state;
/**
* This field points to the frame header data.
*/
struct scu_unsolicited_frame_header *header;
/**
* This field points to the frame buffer data.
*/
void *buffer;
};
/**
* struct sci_uf_header_array -
*
* This structure contains all of the unsolicited frame header information.
*/
struct sci_uf_header_array {
/**
* This field is represents a virtual pointer to the start
* address of the UF address table. The table contains
* 64-bit pointers as required by the hardware.
*/
struct scu_unsolicited_frame_header *array;
/**
* This field specifies the physical address location for the UF
* buffer array.
*/
dma_addr_t physical_address;
};
/**
* struct sci_uf_buffer_array -
*
* This structure contains all of the unsolicited frame buffer (actual payload)
* information.
*/
struct sci_uf_buffer_array {
/**
* This field is the unsolicited frame data its used to manage
* the data for the unsolicited frame requests. It also represents
* the virtual address location that corresponds to the
* physical_address field.
*/
struct sci_unsolicited_frame array[SCU_MAX_UNSOLICITED_FRAMES];
/**
* This field specifies the physical address location for the UF
* buffer array.
*/
dma_addr_t physical_address;
};
/**
* struct sci_uf_address_table_array -
*
* This object maintains all of the unsolicited frame address table specific
* data. The address table is a collection of 64-bit pointers that point to
* 1KB buffers into which the silicon will DMA unsolicited frames.
*/
struct sci_uf_address_table_array {
/**
* This field represents a virtual pointer that refers to the
* starting address of the UF address table.
* 64-bit pointers are required by the hardware.
*/
u64 *array;
/**
* This field specifies the physical address location for the UF
* address table.
*/
dma_addr_t physical_address;
};
/**
* struct sci_unsolicited_frame_control -
*
* This object contains all of the data necessary to handle unsolicited frames.
*/
struct sci_unsolicited_frame_control {
/**
* This field is the software copy of the unsolicited frame queue
* get pointer. The controller object writes this value to the
* hardware to let the hardware put more unsolicited frame entries.
*/
u32 get;
/**
* This field contains all of the unsolicited frame header
* specific fields.
*/
struct sci_uf_header_array headers;
/**
* This field contains all of the unsolicited frame buffer
* specific fields.
*/
struct sci_uf_buffer_array buffers;
/**
* This field contains all of the unsolicited frame address table
* specific fields.
*/
struct sci_uf_address_table_array address_table;
};
#define SCI_UFI_BUF_SIZE (SCU_MAX_UNSOLICITED_FRAMES * SCU_UNSOLICITED_FRAME_BUFFER_SIZE)
#define SCI_UFI_HDR_SIZE (SCU_MAX_UNSOLICITED_FRAMES * sizeof(struct scu_unsolicited_frame_header))
#define SCI_UFI_TOTAL_SIZE (SCI_UFI_BUF_SIZE + SCI_UFI_HDR_SIZE + SCU_MAX_UNSOLICITED_FRAMES * sizeof(u64))
struct isci_host;
void sci_unsolicited_frame_control_construct(struct isci_host *ihost);
enum sci_status sci_unsolicited_frame_control_get_header(
struct sci_unsolicited_frame_control *uf_control,
u32 frame_index,
void **frame_header);
enum sci_status sci_unsolicited_frame_control_get_buffer(
struct sci_unsolicited_frame_control *uf_control,
u32 frame_index,
void **frame_buffer);
bool sci_unsolicited_frame_control_release_frame(
struct sci_unsolicited_frame_control *uf_control,
u32 frame_index);
#endif /* _SCIC_SDS_UNSOLICITED_FRAME_CONTROL_H_ */
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