1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
*
* Linux MegaRAID device driver
*
* Copyright (c) 2003-2004 LSI Logic Corporation.
*
* FILE : mega_common.h
*
* Libaray of common routine used by all low-level megaraid drivers
*/
#ifndef _MEGA_COMMON_H_
#define _MEGA_COMMON_H_
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/blkdev.h>
#include <linux/list.h>
#include <linux/moduleparam.h>
#include <linux/dma-mapping.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#define LSI_MAX_CHANNELS 16
#define LSI_MAX_LOGICAL_DRIVES_64LD (64+1)
#define HBA_SIGNATURE_64_BIT 0x299
#define PCI_CONF_AMISIG64 0xa4
#define MEGA_SCSI_INQ_EVPD 1
#define MEGA_INVALID_FIELD_IN_CDB 0x24
/**
* scb_t - scsi command control block
* @ccb : command control block for individual driver
* @list : list of control blocks
* @gp : general purpose field for LLDs
* @sno : all SCBs have a serial number
* @scp : associated scsi command
* @state : current state of scb
* @dma_dir : direction of data transfer
* @dma_type : transfer with sg list, buffer, or no data transfer
* @dev_channel : actual channel on the device
* @dev_target : actual target on the device
* @status : completion status
*
* This is our central data structure to issue commands the each driver.
* Driver specific data structures are maintained in the ccb field.
* scb provides a field 'gp', which can be used by LLD for its own purposes
*
* dev_channel and dev_target must be initialized with the actual channel and
* target on the controller.
*/
typedef struct {
caddr_t ccb;
struct list_head list;
unsigned long gp;
unsigned int sno;
struct scsi_cmnd *scp;
uint32_t state;
uint32_t dma_direction;
uint32_t dma_type;
uint16_t dev_channel;
uint16_t dev_target;
uint32_t status;
} scb_t;
/*
* SCB states as it transitions from one state to another
*/
#define SCB_FREE 0x0000 /* on the free list */
#define SCB_ACTIVE 0x0001 /* off the free list */
#define SCB_PENDQ 0x0002 /* on the pending queue */
#define SCB_ISSUED 0x0004 /* issued - owner f/w */
#define SCB_ABORT 0x0008 /* Got an abort for this one */
#define SCB_RESET 0x0010 /* Got a reset for this one */
/*
* DMA types for scb
*/
#define MRAID_DMA_NONE 0x0000 /* no data transfer for this command */
#define MRAID_DMA_WSG 0x0001 /* data transfer using a sg list */
#define MRAID_DMA_WBUF 0x0002 /* data transfer using a contiguous buffer */
/**
* struct adapter_t - driver's initialization structure
* @aram dpc_h : tasklet handle
* @pdev : pci configuration pointer for kernel
* @host : pointer to host structure of mid-layer
* @lock : synchronization lock for mid-layer and driver
* @quiescent : driver is quiescent for now.
* @outstanding_cmds : number of commands pending in the driver
* @kscb_list : pointer to the bulk of SCBs pointers for IO
* @kscb_pool : pool of free scbs for IO
* @kscb_pool_lock : lock for pool of free scbs
* @pend_list : pending commands list
* @pend_list_lock : exclusion lock for pending commands list
* @completed_list : list of completed commands
* @completed_list_lock : exclusion lock for list of completed commands
* @sglen : max sg elements supported
* @device_ids : to convert kernel device addr to our devices.
* @raid_device : raid adapter specific pointer
* @max_channel : maximum channel number supported - inclusive
* @max_target : max target supported - inclusive
* @max_lun : max lun supported - inclusive
* @unique_id : unique identifier for each adapter
* @irq : IRQ for this adapter
* @ito : internal timeout value, (-1) means no timeout
* @ibuf : buffer to issue internal commands
* @ibuf_dma_h : dma handle for the above buffer
* @uscb_list : SCB pointers for user cmds, common mgmt module
* @uscb_pool : pool of SCBs for user commands
* @uscb_pool_lock : exclusion lock for these SCBs
* @max_cmds : max outstanding commands
* @fw_version : firmware version
* @bios_version : bios version
* @max_cdb_sz : biggest CDB size supported.
* @ha : is high availability present - clustering
* @init_id : initiator ID, the default value should be 7
* @max_sectors : max sectors per request
* @cmd_per_lun : max outstanding commands per LUN
* @being_detached : set when unloading, no more mgmt calls
*
*
* mraid_setup_device_map() can be called anytime after the device map is
* available and MRAID_GET_DEVICE_MAP() can be called whenever the mapping is
* required, usually from LLD's queue entry point. The formar API sets up the
* MRAID_IS_LOGICAL(adapter_t *, struct scsi_cmnd *) to find out if the
* device in question is a logical drive.
*
* quiescent flag should be set by the driver if it is not accepting more
* commands
*
* NOTE: The fields of this structures are placed to minimize cache misses
*/
// amount of space required to store the bios and firmware version strings
#define VERSION_SIZE 16
typedef struct {
struct tasklet_struct dpc_h;
struct pci_dev *pdev;
struct Scsi_Host *host;
spinlock_t lock;
uint8_t quiescent;
int outstanding_cmds;
scb_t *kscb_list;
struct list_head kscb_pool;
spinlock_t kscb_pool_lock;
struct list_head pend_list;
spinlock_t pend_list_lock;
struct list_head completed_list;
spinlock_t completed_list_lock;
uint16_t sglen;
int device_ids[LSI_MAX_CHANNELS]
[LSI_MAX_LOGICAL_DRIVES_64LD];
caddr_t raid_device;
uint8_t max_channel;
uint16_t max_target;
uint8_t max_lun;
uint32_t unique_id;
int irq;
uint8_t ito;
caddr_t ibuf;
dma_addr_t ibuf_dma_h;
scb_t *uscb_list;
struct list_head uscb_pool;
spinlock_t uscb_pool_lock;
int max_cmds;
uint8_t fw_version[VERSION_SIZE];
uint8_t bios_version[VERSION_SIZE];
uint8_t max_cdb_sz;
uint8_t ha;
uint16_t init_id;
uint16_t max_sectors;
uint16_t cmd_per_lun;
atomic_t being_detached;
} adapter_t;
#define SCSI_FREE_LIST_LOCK(adapter) (&adapter->kscb_pool_lock)
#define USER_FREE_LIST_LOCK(adapter) (&adapter->uscb_pool_lock)
#define PENDING_LIST_LOCK(adapter) (&adapter->pend_list_lock)
#define COMPLETED_LIST_LOCK(adapter) (&adapter->completed_list_lock)
// conversion from scsi command
#define SCP2HOST(scp) (scp)->device->host // to host
#define SCP2HOSTDATA(scp) SCP2HOST(scp)->hostdata // to soft state
#define SCP2CHANNEL(scp) (scp)->device->channel // to channel
#define SCP2TARGET(scp) (scp)->device->id // to target
#define SCP2LUN(scp) (u32)(scp)->device->lun // to LUN
// generic macro to convert scsi command and host to controller's soft state
#define SCSIHOST2ADAP(host) (((caddr_t *)(host->hostdata))[0])
#define SCP2ADAPTER(scp) (adapter_t *)SCSIHOST2ADAP(SCP2HOST(scp))
#define MRAID_IS_LOGICAL(adp, scp) \
(SCP2CHANNEL(scp) == (adp)->max_channel) ? 1 : 0
#define MRAID_IS_LOGICAL_SDEV(adp, sdev) \
(sdev->channel == (adp)->max_channel) ? 1 : 0
/**
* MRAID_GET_DEVICE_MAP - device ids
* @adp : adapter's soft state
* @scp : mid-layer scsi command pointer
* @p_chan : physical channel on the controller
* @target : target id of the device or logical drive number
* @islogical : set if the command is for the logical drive
*
* Macro to retrieve information about device class, logical or physical and
* the corresponding physical channel and target or logical drive number
*/
#define MRAID_GET_DEVICE_MAP(adp, scp, p_chan, target, islogical) \
/* \
* Is the request coming for the virtual channel \
*/ \
islogical = MRAID_IS_LOGICAL(adp, scp); \
\
/* \
* Get an index into our table of drive ids mapping \
*/ \
if (islogical) { \
p_chan = 0xFF; \
target = \
(adp)->device_ids[(adp)->max_channel][SCP2TARGET(scp)]; \
} \
else { \
p_chan = ((adp)->device_ids[SCP2CHANNEL(scp)] \
[SCP2TARGET(scp)] >> 8) & 0xFF; \
target = ((adp)->device_ids[SCP2CHANNEL(scp)] \
[SCP2TARGET(scp)] & 0xFF); \
}
/*
* ### Helper routines ###
*/
#define LSI_DBGLVL mraid_debug_level // each LLD must define a global
// mraid_debug_level
#ifdef DEBUG
#if defined (_ASSERT_PANIC)
#define ASSERT_ACTION panic
#else
#define ASSERT_ACTION printk
#endif
#define ASSERT(expression) \
if (!(expression)) { \
ASSERT_ACTION("assertion failed:(%s), file: %s, line: %d:%s\n", \
#expression, __FILE__, __LINE__, __func__); \
}
#else
#define ASSERT(expression)
#endif
/**
* struct mraid_pci_blk - structure holds DMA memory block info
* @vaddr : virtual address to a memory block
* @dma_addr : DMA handle to a memory block
*
* This structure is filled up for the caller. It is the responsibilty of the
* caller to allocate this array big enough to store addresses for all
* requested elements
*/
struct mraid_pci_blk {
caddr_t vaddr;
dma_addr_t dma_addr;
};
#endif // _MEGA_COMMON_H_
|
