3 * Linux MegaRAID device driver
5 * Copyright (c) 2003-2004 LSI Logic Corporation.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
12 * FILE : mega_common.h
14 * Libaray of common routine used by all low-level megaraid drivers
17 #ifndef _MEGA_COMMON_H_
18 #define _MEGA_COMMON_H_
20 #include <linux/kernel.h>
21 #include <linux/types.h>
22 #include <linux/pci.h>
23 #include <linux/spinlock.h>
24 #include <linux/mutex.h>
25 #include <linux/interrupt.h>
26 #include <linux/delay.h>
27 #include <linux/blkdev.h>
28 #include <linux/list.h>
29 #include <linux/moduleparam.h>
30 #include <linux/dma-mapping.h>
31 #include <asm/semaphore.h>
32 #include <scsi/scsi.h>
33 #include <scsi/scsi_cmnd.h>
34 #include <scsi/scsi_device.h>
35 #include <scsi/scsi_host.h>
38 #define LSI_MAX_CHANNELS 16
39 #define LSI_MAX_LOGICAL_DRIVES_64LD (64+1)
41 #define HBA_SIGNATURE_64_BIT 0x299
42 #define PCI_CONF_AMISIG64 0xa4
44 #define MEGA_SCSI_INQ_EVPD 1
45 #define MEGA_INVALID_FIELD_IN_CDB 0x24
49 * scb_t - scsi command control block
50 * @ccb : command control block for individual driver
51 * @list : list of control blocks
52 * @gp : general purpose field for LLDs
53 * @sno : all SCBs have a serial number
54 * @scp : associated scsi command
55 * @state : current state of scb
56 * @dma_dir : direction of data transfer
57 * @dma_type : transfer with sg list, buffer, or no data transfer
58 * @dev_channel : actual channel on the device
59 * @dev_target : actual target on the device
60 * @status : completion status
62 * This is our central data structure to issue commands the each driver.
63 * Driver specific data structures are maintained in the ccb field.
64 * scb provides a field 'gp', which can be used by LLD for its own purposes
66 * dev_channel and dev_target must be initialized with the actual channel and
67 * target on the controller.
71 struct list_head list;
74 struct scsi_cmnd *scp;
76 uint32_t dma_direction;
84 * SCB states as it transitions from one state to another
86 #define SCB_FREE 0x0000 /* on the free list */
87 #define SCB_ACTIVE 0x0001 /* off the free list */
88 #define SCB_PENDQ 0x0002 /* on the pending queue */
89 #define SCB_ISSUED 0x0004 /* issued - owner f/w */
90 #define SCB_ABORT 0x0008 /* Got an abort for this one */
91 #define SCB_RESET 0x0010 /* Got a reset for this one */
96 #define MRAID_DMA_NONE 0x0000 /* no data transfer for this command */
97 #define MRAID_DMA_WSG 0x0001 /* data transfer using a sg list */
98 #define MRAID_DMA_WBUF 0x0002 /* data transfer using a contiguous buffer */
102 * struct adapter_t - driver's initialization structure
103 * @aram dpc_h : tasklet handle
104 * @pdev : pci configuration pointer for kernel
105 * @host : pointer to host structure of mid-layer
106 * @lock : synchronization lock for mid-layer and driver
107 * @quiescent : driver is quiescent for now.
108 * @outstanding_cmds : number of commands pending in the driver
109 * @kscb_list : pointer to the bulk of SCBs pointers for IO
110 * @kscb_pool : pool of free scbs for IO
111 * @kscb_pool_lock : lock for pool of free scbs
112 * @pend_list : pending commands list
113 * @pend_list_lock : exclusion lock for pending commands list
114 * @completed_list : list of completed commands
115 * @completed_list_lock : exclusion lock for list of completed commands
116 * @sglen : max sg elements supported
117 * @device_ids : to convert kernel device addr to our devices.
118 * @raid_device : raid adapter specific pointer
119 * @max_channel : maximum channel number supported - inclusive
120 * @max_target : max target supported - inclusive
121 * @max_lun : max lun supported - inclusive
122 * @unique_id : unique identifier for each adapter
123 * @irq : IRQ for this adapter
124 * @ito : internal timeout value, (-1) means no timeout
125 * @ibuf : buffer to issue internal commands
126 * @ibuf_dma_h : dma handle for the above buffer
127 * @uscb_list : SCB pointers for user cmds, common mgmt module
128 * @uscb_pool : pool of SCBs for user commands
129 * @uscb_pool_lock : exclusion lock for these SCBs
130 * @max_cmds : max outstanding commands
131 * @fw_version : firmware version
132 * @bios_version : bios version
133 * @max_cdb_sz : biggest CDB size supported.
134 * @ha : is high availability present - clustering
135 * @init_id : initiator ID, the default value should be 7
136 * @max_sectors : max sectors per request
137 * @cmd_per_lun : max outstanding commands per LUN
138 * @being_detached : set when unloading, no more mgmt calls
141 * mraid_setup_device_map() can be called anytime after the device map is
142 * available and MRAID_GET_DEVICE_MAP() can be called whenever the mapping is
143 * required, usually from LLD's queue entry point. The formar API sets up the
144 * MRAID_IS_LOGICAL(adapter_t *, struct scsi_cmnd *) to find out if the
145 * device in question is a logical drive.
147 * quiescent flag should be set by the driver if it is not accepting more
150 * NOTE: The fields of this structures are placed to minimize cache misses
153 // amount of space required to store the bios and firmware version strings
154 #define VERSION_SIZE 16
157 struct tasklet_struct dpc_h;
158 struct pci_dev *pdev;
159 struct Scsi_Host *host;
162 int outstanding_cmds;
164 struct list_head kscb_pool;
165 spinlock_t kscb_pool_lock;
166 struct list_head pend_list;
167 spinlock_t pend_list_lock;
168 struct list_head completed_list;
169 spinlock_t completed_list_lock;
171 int device_ids[LSI_MAX_CHANNELS]
172 [LSI_MAX_LOGICAL_DRIVES_64LD];
182 dma_addr_t ibuf_dma_h;
184 struct list_head uscb_pool;
185 spinlock_t uscb_pool_lock;
187 uint8_t fw_version[VERSION_SIZE];
188 uint8_t bios_version[VERSION_SIZE];
192 uint16_t max_sectors;
193 uint16_t cmd_per_lun;
194 atomic_t being_detached;
197 #define SCSI_FREE_LIST_LOCK(adapter) (&adapter->kscb_pool_lock)
198 #define USER_FREE_LIST_LOCK(adapter) (&adapter->uscb_pool_lock)
199 #define PENDING_LIST_LOCK(adapter) (&adapter->pend_list_lock)
200 #define COMPLETED_LIST_LOCK(adapter) (&adapter->completed_list_lock)
203 // conversion from scsi command
204 #define SCP2HOST(scp) (scp)->device->host // to host
205 #define SCP2HOSTDATA(scp) SCP2HOST(scp)->hostdata // to soft state
206 #define SCP2CHANNEL(scp) (scp)->device->channel // to channel
207 #define SCP2TARGET(scp) (scp)->device->id // to target
208 #define SCP2LUN(scp) (scp)->device->lun // to LUN
210 // generic macro to convert scsi command and host to controller's soft state
211 #define SCSIHOST2ADAP(host) (((caddr_t *)(host->hostdata))[0])
212 #define SCP2ADAPTER(scp) (adapter_t *)SCSIHOST2ADAP(SCP2HOST(scp))
215 #define MRAID_IS_LOGICAL(adp, scp) \
216 (SCP2CHANNEL(scp) == (adp)->max_channel) ? 1 : 0
218 #define MRAID_IS_LOGICAL_SDEV(adp, sdev) \
219 (sdev->channel == (adp)->max_channel) ? 1 : 0
222 * MRAID_GET_DEVICE_MAP - device ids
223 * @adp : adapter's soft state
224 * @scp : mid-layer scsi command pointer
225 * @p_chan : physical channel on the controller
226 * @target : target id of the device or logical drive number
227 * @islogical : set if the command is for the logical drive
229 * Macro to retrieve information about device class, logical or physical and
230 * the corresponding physical channel and target or logical drive number
232 #define MRAID_GET_DEVICE_MAP(adp, scp, p_chan, target, islogical) \
234 * Is the request coming for the virtual channel \
236 islogical = MRAID_IS_LOGICAL(adp, scp); \
239 * Get an index into our table of drive ids mapping \
244 (adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \
247 p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)] \
248 [SCP2TARGET(scp)] >> 8) & 0xFF; \
249 target = ((adp)->device_ids[SCP2CHANNEL(scp)] \
250 [SCP2TARGET(scp)] & 0xFF); \
254 * ### Helper routines ###
256 #define LSI_DBGLVL mraid_debug_level // each LLD must define a global
260 #if defined (_ASSERT_PANIC)
261 #define ASSERT_ACTION panic
263 #define ASSERT_ACTION printk
266 #define ASSERT(expression) \
267 if (!(expression)) { \
268 ASSERT_ACTION("assertion failed:(%s), file: %s, line: %d:%s\n", \
269 #expression, __FILE__, __LINE__, __FUNCTION__); \
272 #define ASSERT(expression)
276 * struct mraid_pci_blk - structure holds DMA memory block info
277 * @vaddr : virtual address to a memory block
278 * @dma_addr : DMA handle to a memory block
280 * This structure is filled up for the caller. It is the responsibilty of the
281 * caller to allocate this array big enough to store addresses for all
284 struct mraid_pci_blk {
289 #endif // _MEGA_COMMON_H_
291 // vim: set ts=8 sw=8 tw=78: