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1/*
2 *
3 * Linux MegaRAID device driver
4 *
5 * Copyright (c) 2003-2004 LSI Logic Corporation.
6 *
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.
11 *
12 * FILE : mega_common.h
13 *
14 * Libaray of common routine used by all low-level megaraid drivers
15 */
16
17#ifndef _MEGA_COMMON_H_
18#define _MEGA_COMMON_H_
19
20#include <linux/kernel.h>
21#include <linux/types.h>
22#include <linux/pci.h>
23#include <linux/spinlock.h>
24#include <linux/interrupt.h>
25#include <linux/delay.h>
26#include <linux/blkdev.h>
27#include <linux/list.h>
28#include <linux/version.h>
29#include <linux/moduleparam.h>
30#include <asm/semaphore.h>
31#include <scsi/scsi.h>
32#include <scsi/scsi_cmnd.h>
33#include <scsi/scsi_device.h>
34#include <scsi/scsi_host.h>
35
36
37#define LSI_MAX_CHANNELS 16
38#define LSI_MAX_LOGICAL_DRIVES_64LD (64+1)
39
40
41/**
42 * scb_t - scsi command control block
43 * @param ccb : command control block for individual driver
44 * @param list : list of control blocks
45 * @param gp : general purpose field for LLDs
46 * @param sno : all SCBs have a serial number
47 * @param scp : associated scsi command
48 * @param state : current state of scb
49 * @param dma_dir : direction of data transfer
50 * @param dma_type : transfer with sg list, buffer, or no data transfer
51 * @param dev_channel : actual channel on the device
52 * @param dev_target : actual target on the device
53 * @param status : completion status
54 *
55 * This is our central data structure to issue commands the each driver.
56 * Driver specific data structures are maintained in the ccb field.
57 * scb provides a field 'gp', which can be used by LLD for its own purposes
58 *
59 * dev_channel and dev_target must be initialized with the actual channel and
60 * target on the controller.
61 */
62typedef struct {
63 caddr_t ccb;
64 struct list_head list;
65 unsigned long gp;
66 unsigned int sno;
67 struct scsi_cmnd *scp;
68 uint32_t state;
69 uint32_t dma_direction;
70 uint32_t dma_type;
71 uint16_t dev_channel;
72 uint16_t dev_target;
73 uint32_t status;
74} scb_t;
75
76/*
77 * SCB states as it transitions from one state to another
78 */
79#define SCB_FREE 0x0000 /* on the free list */
80#define SCB_ACTIVE 0x0001 /* off the free list */
81#define SCB_PENDQ 0x0002 /* on the pending queue */
82#define SCB_ISSUED 0x0004 /* issued - owner f/w */
83#define SCB_ABORT 0x0008 /* Got an abort for this one */
84#define SCB_RESET 0x0010 /* Got a reset for this one */
85
86/*
87 * DMA types for scb
88 */
89#define MRAID_DMA_NONE 0x0000 /* no data transfer for this command */
90#define MRAID_DMA_WSG 0x0001 /* data transfer using a sg list */
91#define MRAID_DMA_WBUF 0x0002 /* data transfer using a contiguous buffer */
92
93
94/**
95 * struct adapter_t - driver's initialization structure
96 * @param dpc_h : tasklet handle
97 * @param pdev : pci configuration pointer for kernel
98 * @param host : pointer to host structure of mid-layer
99 * @param host_lock : pointer to appropriate lock
100 * @param lock : synchronization lock for mid-layer and driver
101 * @param quiescent : driver is quiescent for now.
102 * @param outstanding_cmds : number of commands pending in the driver
103 * @param kscb_list : pointer to the bulk of SCBs pointers for IO
104 * @param kscb_pool : pool of free scbs for IO
105 * @param kscb_pool_lock : lock for pool of free scbs
106 * @param pend_list : pending commands list
107 * @param pend_list_lock : exlusion lock for pending commands list
108 * @param completed_list : list of completed commands
109 * @param completed_list_lock : exclusion lock for list of completed commands
110 * @param sglen : max sg elements supported
111 * @param device_ids : to convert kernel device addr to our devices.
112 * @param raid_device : raid adapter specific pointer
113 * @param max_channel : maximum channel number supported - inclusive
114 * @param max_target : max target supported - inclusive
115 * @param max_lun : max lun supported - inclusive
116 * @param unique_id : unique identifier for each adapter
117 * @param irq : IRQ for this adapter
118 * @param ito : internal timeout value, (-1) means no timeout
119 * @param ibuf : buffer to issue internal commands
120 * @param ibuf_dma_h : dma handle for the above buffer
121 * @param uscb_list : SCB pointers for user cmds, common mgmt module
122 * @param uscb_pool : pool of SCBs for user commands
123 * @param uscb_pool_lock : exclusion lock for these SCBs
124 * @param max_cmds : max outstanding commands
125 * @param fw_version : firmware version
126 * @param bios_version : bios version
127 * @param max_cdb_sz : biggest CDB size supported.
128 * @param ha : is high availability present - clustering
129 * @param init_id : initiator ID, the default value should be 7
130 * @param max_sectors : max sectors per request
131 * @param cmd_per_lun : max outstanding commands per LUN
132 * @param being_detached : set when unloading, no more mgmt calls
133 *
134 *
135 * mraid_setup_device_map() can be called anytime after the device map is
136 * available and MRAID_GET_DEVICE_MAP() can be called whenever the mapping is
137 * required, usually from LLD's queue entry point. The formar API sets up the
138 * MRAID_IS_LOGICAL(adapter_t *, struct scsi_cmnd *) to find out if the
139 * device in question is a logical drive.
140 *
141 * quiescent flag should be set by the driver if it is not accepting more
142 * commands
143 *
144 * NOTE: The fields of this structures are placed to minimize cache misses
145 */
146
147// amount of space required to store the bios and firmware version strings
148#define VERSION_SIZE 16
149
150typedef struct {
151 struct tasklet_struct dpc_h;
152 struct pci_dev *pdev;
153 struct Scsi_Host *host;
154 spinlock_t *host_lock;
155 spinlock_t lock;
156 uint8_t quiescent;
157 int outstanding_cmds;
158 scb_t *kscb_list;
159 struct list_head kscb_pool;
160 spinlock_t kscb_pool_lock;
161 struct list_head pend_list;
162 spinlock_t pend_list_lock;
163 struct list_head completed_list;
164 spinlock_t completed_list_lock;
165 uint16_t sglen;
166 int device_ids[LSI_MAX_CHANNELS]
167 [LSI_MAX_LOGICAL_DRIVES_64LD];
168 caddr_t raid_device;
169 uint8_t max_channel;
170 uint16_t max_target;
171 uint8_t max_lun;
172
173 uint32_t unique_id;
174 uint8_t irq;
175 uint8_t ito;
176 caddr_t ibuf;
177 dma_addr_t ibuf_dma_h;
178 scb_t *uscb_list;
179 struct list_head uscb_pool;
180 spinlock_t uscb_pool_lock;
181 int max_cmds;
182 uint8_t fw_version[VERSION_SIZE];
183 uint8_t bios_version[VERSION_SIZE];
184 uint8_t max_cdb_sz;
185 uint8_t ha;
186 uint16_t init_id;
187 uint16_t max_sectors;
188 uint16_t cmd_per_lun;
189 atomic_t being_detached;
190} adapter_t;
191
192#define SCSI_FREE_LIST_LOCK(adapter) (&adapter->kscb_pool_lock)
193#define USER_FREE_LIST_LOCK(adapter) (&adapter->uscb_pool_lock)
194#define PENDING_LIST_LOCK(adapter) (&adapter->pend_list_lock)
195#define COMPLETED_LIST_LOCK(adapter) (&adapter->completed_list_lock)
196
197
198// conversion from scsi command
199#define SCP2HOST(scp) (scp)->device->host // to host
200#define SCP2HOSTDATA(scp) SCP2HOST(scp)->hostdata // to soft state
201#define SCP2CHANNEL(scp) (scp)->device->channel // to channel
202#define SCP2TARGET(scp) (scp)->device->id // to target
203#define SCP2LUN(scp) (scp)->device->lun // to LUN
204
205// generic macro to convert scsi command and host to controller's soft state
206#define SCSIHOST2ADAP(host) (((caddr_t *)(host->hostdata))[0])
207#define SCP2ADAPTER(scp) (adapter_t *)SCSIHOST2ADAP(SCP2HOST(scp))
208
209
210/**
211 * MRAID_GET_DEVICE_MAP - device ids
212 * @param adp - Adapter's soft state
213 * @param scp - mid-layer scsi command pointer
214 * @param p_chan - physical channel on the controller
215 * @param target - target id of the device or logical drive number
216 * @param islogical - set if the command is for the logical drive
217 *
218 * Macro to retrieve information about device class, logical or physical and
219 * the corresponding physical channel and target or logical drive number
220 **/
221#define MRAID_IS_LOGICAL(adp, scp) \
222 (SCP2CHANNEL(scp) == (adp)->max_channel) ? 1 : 0
223
224#define MRAID_IS_LOGICAL_SDEV(adp, sdev) \
225 (sdev->channel == (adp)->max_channel) ? 1 : 0
226
227#define MRAID_GET_DEVICE_MAP(adp, scp, p_chan, target, islogical) \
228 /* \
229 * Is the request coming for the virtual channel \
230 */ \
231 islogical = MRAID_IS_LOGICAL(adp, scp); \
232 \
233 /* \
234 * Get an index into our table of drive ids mapping \
235 */ \
236 if (islogical) { \
237 p_chan = 0xFF; \
238 target = \
239 (adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \
240 } \
241 else { \
242 p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)] \
243 [SCP2TARGET(scp)] >> 8) & 0xFF; \
244 target = ((adp)->device_ids[SCP2CHANNEL(scp)] \
245 [SCP2TARGET(scp)] & 0xFF); \
246 }
247
248/*
249 * ### Helper routines ###
250 */
251#define LSI_DBGLVL mraid_debug_level // each LLD must define a global
252 // mraid_debug_level
253
254#ifdef DEBUG
255#if defined (_ASSERT_PANIC)
256#define ASSERT_ACTION panic
257#else
258#define ASSERT_ACTION printk
259#endif
260
261#define ASSERT(expression) \
262 if (!(expression)) { \
263 ASSERT_ACTION("assertion failed:(%s), file: %s, line: %d:%s\n", \
264 #expression, __FILE__, __LINE__, __FUNCTION__); \
265 }
266#else
267#define ASSERT(expression)
268#endif
269
270/*
271 * struct mraid_pci_blk - structure holds DMA memory block info
272 * @param vaddr : virtual address to a memory block
273 * @param dma_addr : DMA handle to a memory block
274 *
275 * This structure is filled up for the caller. It is the responsibilty of the
276 * caller to allocate this array big enough to store addresses for all
277 * requested elements
278 */
279struct mraid_pci_blk {
280 caddr_t vaddr;
281 dma_addr_t dma_addr;
282};
283
284#endif // _MEGA_COMMON_H_
285
286// vim: set ts=8 sw=8 tw=78:
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-20 22:31:33 -0500