linux/drivers/scsi/isci/unsolicited_frame_control.h
Dan Williams abec912d71 isci: refactor initialization for S3/S4
Based on an original implementation by Ed Nadolski and Artur Wojcik

In preparation for S3/S4 support refactor initialization so that
driver-load and resume-from-suspend can share the common init path of
isci_host_init().  Organize the initialization into objects that are
self-contained to the driver (initialized by isci_host_init) versus
those that have some upward registration (initialized at allocation time
asd_sas_phy, asd_sas_port, dma allocations).  The largest change is
moving the the validation of the oem and module parameters from
isci_host_init() to isci_host_alloc().

The S3/S4 approach being taken is that libsas will be tasked with
remembering the state of the domain and the lldd is free to be
forgetful.  In the case of isci we'll just re-init using a subset of the
normal driver load path.

[clean up some unused / mis-indented function definitions in host.h]

Signed-off-by: Ed Nadolski <edmund.nadolski@intel.com>
Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2012-05-17 12:27:12 -07:00

283 lines
8.4 KiB
C

/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
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* it under the terms of version 2 of the GNU General Public License as
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* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* from this software without specific prior written permission.
*
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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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_ */