1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  * mtip32xx.h - Header file for the P320 SSD Block Driver
4  *   Copyright (C) 2011 Micron Technology, Inc.
5  *
6  * Portions of this code were derived from works subjected to the
7  * following copyright:
8  *    Copyright (C) 2009 Integrated Device Technology, Inc.
9  */
10 
11 #ifndef __MTIP32XX_H__
12 #define __MTIP32XX_H__
13 
14 #include <linux/spinlock.h>
15 #include <linux/rwsem.h>
16 #include <linux/ata.h>
17 #include <linux/interrupt.h>
18 
19 /* Offset of Subsystem Device ID in pci confoguration space */
20 #define PCI_SUBSYSTEM_DEVICEID	0x2E
21 
22 /* offset of Device Control register in PCIe extended capabilites space */
23 #define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET	0x48
24 
25 /* check for erase mode support during secure erase */
26 #define MTIP_SEC_ERASE_MODE     0x2
27 
28 /* # of times to retry timed out/failed IOs */
29 #define MTIP_MAX_RETRIES	2
30 
31 /* Various timeout values in ms */
32 #define MTIP_NCQ_CMD_TIMEOUT_MS      15000
33 #define MTIP_IOCTL_CMD_TIMEOUT_MS    5000
34 #define MTIP_INT_CMD_TIMEOUT_MS      5000
35 #define MTIP_QUIESCE_IO_TIMEOUT_MS   (MTIP_NCQ_CMD_TIMEOUT_MS * \
36 				     (MTIP_MAX_RETRIES + 1))
37 
38 /* check for timeouts every 500ms */
39 #define MTIP_TIMEOUT_CHECK_PERIOD	500
40 
41 /* ftl rebuild */
42 #define MTIP_FTL_REBUILD_OFFSET		142
43 #define MTIP_FTL_REBUILD_MAGIC		0xED51
44 #define MTIP_FTL_REBUILD_TIMEOUT_MS	2400000
45 
46 /* unaligned IO handling */
47 #define MTIP_MAX_UNALIGNED_SLOTS	2
48 
49 /* Macro to extract the tag bit number from a tag value. */
50 #define MTIP_TAG_BIT(tag)	(tag & 0x1F)
51 
52 /*
53  * Macro to extract the tag index from a tag value. The index
54  * is used to access the correct s_active/Command Issue register based
55  * on the tag value.
56  */
57 #define MTIP_TAG_INDEX(tag)	(tag >> 5)
58 
59 /*
60  * Maximum number of scatter gather entries
61  * a single command may have.
62  */
63 #define MTIP_MAX_SG		504
64 
65 /*
66  * Maximum number of slot groups (Command Issue & s_active registers)
67  * NOTE: This is the driver maximum; check dd->slot_groups for actual value.
68  */
69 #define MTIP_MAX_SLOT_GROUPS	8
70 
71 /* Internal command tag. */
72 #define MTIP_TAG_INTERNAL	0
73 
74 /* Micron Vendor ID & P320x SSD Device ID */
75 #define PCI_VENDOR_ID_MICRON    0x1344
76 #define P320H_DEVICE_ID		0x5150
77 #define P320M_DEVICE_ID		0x5151
78 #define P320S_DEVICE_ID		0x5152
79 #define P325M_DEVICE_ID		0x5153
80 #define P420H_DEVICE_ID		0x5160
81 #define P420M_DEVICE_ID		0x5161
82 #define P425M_DEVICE_ID		0x5163
83 
84 /* Driver name and version strings */
85 #define MTIP_DRV_NAME		"mtip32xx"
86 #define MTIP_DRV_VERSION	"1.3.1"
87 
88 /* Maximum number of minor device numbers per device. */
89 #define MTIP_MAX_MINORS		16
90 
91 /* Maximum number of supported command slots. */
92 #define MTIP_MAX_COMMAND_SLOTS	(MTIP_MAX_SLOT_GROUPS * 32)
93 
94 /*
95  * Per-tag bitfield size in longs.
96  * Linux bit manipulation functions
97  * (i.e. test_and_set_bit, find_next_zero_bit)
98  * manipulate memory in longs, so we try to make the math work.
99  * take the slot groups and find the number of longs, rounding up.
100  * Careful! i386 and x86_64 use different size longs!
101  */
102 #define U32_PER_LONG	(sizeof(long) / sizeof(u32))
103 #define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \
104 					(U32_PER_LONG-1))/U32_PER_LONG)
105 
106 /* BAR number used to access the HBA registers. */
107 #define MTIP_ABAR		5
108 
109 #ifdef DEBUG
110  #define dbg_printk(format, arg...)	\
111 	printk(pr_fmt(format), ##arg);
112 #else
113  #define dbg_printk(format, arg...)
114 #endif
115 
116 #define MTIP_DFS_MAX_BUF_SIZE 1024
117 
118 enum {
119 	/* below are bit numbers in 'flags' defined in mtip_port */
120 	MTIP_PF_IC_ACTIVE_BIT       = 0, /* pio/ioctl */
121 	MTIP_PF_EH_ACTIVE_BIT       = 1, /* error handling */
122 	MTIP_PF_SE_ACTIVE_BIT       = 2, /* secure erase */
123 	MTIP_PF_DM_ACTIVE_BIT       = 3, /* download microcde */
124 	MTIP_PF_TO_ACTIVE_BIT       = 9, /* timeout handling */
125 	MTIP_PF_PAUSE_IO      =	((1 << MTIP_PF_IC_ACTIVE_BIT) |
126 				(1 << MTIP_PF_EH_ACTIVE_BIT) |
127 				(1 << MTIP_PF_SE_ACTIVE_BIT) |
128 				(1 << MTIP_PF_DM_ACTIVE_BIT) |
129 				(1 << MTIP_PF_TO_ACTIVE_BIT)),
130 	MTIP_PF_HOST_CAP_64         = 10, /* cache HOST_CAP_64 */
131 
132 	MTIP_PF_SVC_THD_ACTIVE_BIT  = 4,
133 	MTIP_PF_ISSUE_CMDS_BIT      = 5,
134 	MTIP_PF_REBUILD_BIT         = 6,
135 	MTIP_PF_SVC_THD_STOP_BIT    = 8,
136 
137 	MTIP_PF_SVC_THD_WORK	= ((1 << MTIP_PF_EH_ACTIVE_BIT) |
138 				  (1 << MTIP_PF_ISSUE_CMDS_BIT) |
139 				  (1 << MTIP_PF_REBUILD_BIT) |
140 				  (1 << MTIP_PF_SVC_THD_STOP_BIT) |
141 				  (1 << MTIP_PF_TO_ACTIVE_BIT)),
142 
143 	/* below are bit numbers in 'dd_flag' defined in driver_data */
144 	MTIP_DDF_SEC_LOCK_BIT	    = 0,
145 	MTIP_DDF_REMOVE_PENDING_BIT = 1,
146 	MTIP_DDF_OVER_TEMP_BIT      = 2,
147 	MTIP_DDF_WRITE_PROTECT_BIT  = 3,
148 	MTIP_DDF_CLEANUP_BIT        = 5,
149 	MTIP_DDF_RESUME_BIT         = 6,
150 	MTIP_DDF_INIT_DONE_BIT      = 7,
151 	MTIP_DDF_REBUILD_FAILED_BIT = 8,
152 	MTIP_DDF_REMOVAL_BIT	    = 9,
153 
154 	MTIP_DDF_STOP_IO      = ((1 << MTIP_DDF_REMOVE_PENDING_BIT) |
155 				(1 << MTIP_DDF_SEC_LOCK_BIT) |
156 				(1 << MTIP_DDF_OVER_TEMP_BIT) |
157 				(1 << MTIP_DDF_WRITE_PROTECT_BIT) |
158 				(1 << MTIP_DDF_REBUILD_FAILED_BIT)),
159 
160 };
161 
162 struct smart_attr {
163 	u8 attr_id;
164 	__le16 flags;
165 	u8 cur;
166 	u8 worst;
167 	__le32 data;
168 	u8 res[3];
169 } __packed;
170 
171 struct mtip_work {
172 	struct work_struct work;
173 	void *port;
174 	int cpu_binding;
175 	u32 completed;
176 } ____cacheline_aligned_in_smp;
177 
178 #define DEFINE_HANDLER(group)                                  \
179 	void mtip_workq_sdbf##group(struct work_struct *work)       \
180 	{                                                      \
181 		struct mtip_work *w = (struct mtip_work *) work;         \
182 		mtip_workq_sdbfx(w->port, group, w->completed);     \
183 	}
184 
185 /* Register Frame Information Structure (FIS), host to device. */
186 struct host_to_dev_fis {
187 	/*
188 	 * FIS type.
189 	 * - 27h Register FIS, host to device.
190 	 * - 34h Register FIS, device to host.
191 	 * - 39h DMA Activate FIS, device to host.
192 	 * - 41h DMA Setup FIS, bi-directional.
193 	 * - 46h Data FIS, bi-directional.
194 	 * - 58h BIST Activate FIS, bi-directional.
195 	 * - 5Fh PIO Setup FIS, device to host.
196 	 * - A1h Set Device Bits FIS, device to host.
197 	 */
198 	unsigned char type;
199 	unsigned char opts;
200 	unsigned char command;
201 	unsigned char features;
202 
203 	union {
204 		unsigned char lba_low;
205 		unsigned char sector;
206 	};
207 	union {
208 		unsigned char lba_mid;
209 		unsigned char cyl_low;
210 	};
211 	union {
212 		unsigned char lba_hi;
213 		unsigned char cyl_hi;
214 	};
215 	union {
216 		unsigned char device;
217 		unsigned char head;
218 	};
219 
220 	union {
221 		unsigned char lba_low_ex;
222 		unsigned char sector_ex;
223 	};
224 	union {
225 		unsigned char lba_mid_ex;
226 		unsigned char cyl_low_ex;
227 	};
228 	union {
229 		unsigned char lba_hi_ex;
230 		unsigned char cyl_hi_ex;
231 	};
232 	unsigned char features_ex;
233 
234 	unsigned char sect_count;
235 	unsigned char sect_cnt_ex;
236 	unsigned char res2;
237 	unsigned char control;
238 
239 	unsigned int res3;
240 };
241 
242 /* Command header structure. */
243 struct mtip_cmd_hdr {
244 	/*
245 	 * Command options.
246 	 * - Bits 31:16 Number of PRD entries.
247 	 * - Bits 15:8 Unused in this implementation.
248 	 * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries.
249 	 * - Bit 6 Write bit, should be set when writing data to the device.
250 	 * - Bit 5 Unused in this implementation.
251 	 * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes).
252 	 */
253 	__le32 opts;
254 	/* This field is unsed when using NCQ. */
255 	union {
256 		__le32 byte_count;
257 		__le32 status;
258 	};
259 	/*
260 	 * Lower 32 bits of the command table address associated with this
261 	 * header. The command table addresses must be 128 byte aligned.
262 	 */
263 	__le32 ctba;
264 	/*
265 	 * If 64 bit addressing is used this field is the upper 32 bits
266 	 * of the command table address associated with this command.
267 	 */
268 	__le32 ctbau;
269 	/* Reserved and unused. */
270 	u32 res[4];
271 };
272 
273 /* Command scatter gather structure (PRD). */
274 struct mtip_cmd_sg {
275 	/*
276 	 * Low 32 bits of the data buffer address. For P320 this
277 	 * address must be 8 byte aligned signified by bits 2:0 being
278 	 * set to 0.
279 	 */
280 	__le32 dba;
281 	/*
282 	 * When 64 bit addressing is used this field is the upper
283 	 * 32 bits of the data buffer address.
284 	 */
285 	__le32 dba_upper;
286 	/* Unused. */
287 	__le32 reserved;
288 	/*
289 	 * Bit 31: interrupt when this data block has been transferred.
290 	 * Bits 30..22: reserved
291 	 * Bits 21..0: byte count (minus 1).  For P320 the byte count must be
292 	 * 8 byte aligned signified by bits 2:0 being set to 1.
293 	 */
294 	__le32 info;
295 };
296 struct mtip_port;
297 
298 struct mtip_int_cmd;
299 
300 /* Structure used to describe a command. */
301 struct mtip_cmd {
302 	void *command; /* ptr to command table entry */
303 
304 	dma_addr_t command_dma; /* corresponding physical address */
305 
306 	int scatter_ents; /* Number of scatter list entries used */
307 
308 	int unaligned; /* command is unaligned on 4k boundary */
309 
310 	union {
311 		struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
312 		struct mtip_int_cmd *icmd;
313 	};
314 
315 	int retries; /* The number of retries left for this command. */
316 
317 	int direction; /* Data transfer direction */
318 	blk_status_t status;
319 };
320 
321 /* Structure used to describe a port. */
322 struct mtip_port {
323 	/* Pointer back to the driver data for this port. */
324 	struct driver_data *dd;
325 	/*
326 	 * Used to determine if the data pointed to by the
327 	 * identify field is valid.
328 	 */
329 	unsigned long identify_valid;
330 	/* Base address of the memory mapped IO for the port. */
331 	void __iomem *mmio;
332 	/* Array of pointers to the memory mapped s_active registers. */
333 	void __iomem *s_active[MTIP_MAX_SLOT_GROUPS];
334 	/* Array of pointers to the memory mapped completed registers. */
335 	void __iomem *completed[MTIP_MAX_SLOT_GROUPS];
336 	/* Array of pointers to the memory mapped Command Issue registers. */
337 	void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS];
338 	/*
339 	 * Pointer to the beginning of the command header memory as used
340 	 * by the driver.
341 	 */
342 	void *command_list;
343 	/*
344 	 * Pointer to the beginning of the command header memory as used
345 	 * by the DMA.
346 	 */
347 	dma_addr_t command_list_dma;
348 	/*
349 	 * Pointer to the beginning of the RX FIS memory as used
350 	 * by the driver.
351 	 */
352 	void *rxfis;
353 	/*
354 	 * Pointer to the beginning of the RX FIS memory as used
355 	 * by the DMA.
356 	 */
357 	dma_addr_t rxfis_dma;
358 	/*
359 	 * Pointer to the DMA region for RX Fis, Identify, RLE10, and SMART
360 	 */
361 	void *block1;
362 	/*
363 	 * DMA address of region for RX Fis, Identify, RLE10, and SMART
364 	 */
365 	dma_addr_t block1_dma;
366 	/*
367 	 * Pointer to the beginning of the identify data memory as used
368 	 * by the driver.
369 	 */
370 	u16 *identify;
371 	/*
372 	 * Pointer to the beginning of the identify data memory as used
373 	 * by the DMA.
374 	 */
375 	dma_addr_t identify_dma;
376 	/*
377 	 * Pointer to the beginning of a sector buffer that is used
378 	 * by the driver when issuing internal commands.
379 	 */
380 	u16 *sector_buffer;
381 	/*
382 	 * Pointer to the beginning of a sector buffer that is used
383 	 * by the DMA when the driver issues internal commands.
384 	 */
385 	dma_addr_t sector_buffer_dma;
386 
387 	u16 *log_buf;
388 	dma_addr_t log_buf_dma;
389 
390 	u8 *smart_buf;
391 	dma_addr_t smart_buf_dma;
392 
393 	/*
394 	 * used to queue commands when an internal command is in progress
395 	 * or error handling is active
396 	 */
397 	unsigned long cmds_to_issue[SLOTBITS_IN_LONGS];
398 	/* Used by mtip_service_thread to wait for an event */
399 	wait_queue_head_t svc_wait;
400 	/*
401 	 * indicates the state of the port. Also, helps the service thread
402 	 * to determine its action on wake up.
403 	 */
404 	unsigned long flags;
405 	/*
406 	 * Timer used to complete commands that have been active for too long.
407 	 */
408 	unsigned long ic_pause_timer;
409 
410 	/* Counter to control queue depth of unaligned IOs */
411 	atomic_t cmd_slot_unal;
412 
413 	/* Spinlock for working around command-issue bug. */
414 	spinlock_t cmd_issue_lock[MTIP_MAX_SLOT_GROUPS];
415 };
416 
417 /*
418  * Driver private data structure.
419  *
420  * One structure is allocated per probed device.
421  */
422 struct driver_data {
423 	void __iomem *mmio; /* Base address of the HBA registers. */
424 
425 	int major; /* Major device number. */
426 
427 	int instance; /* Instance number. First device probed is 0, ... */
428 
429 	struct gendisk *disk; /* Pointer to our gendisk structure. */
430 
431 	struct pci_dev *pdev; /* Pointer to the PCI device structure. */
432 
433 	struct request_queue *queue; /* Our request queue. */
434 
435 	struct blk_mq_tag_set tags; /* blk_mq tags */
436 
437 	struct mtip_port *port; /* Pointer to the port data structure. */
438 
439 	unsigned product_type; /* magic value declaring the product type */
440 
441 	unsigned slot_groups; /* number of slot groups the product supports */
442 
443 	unsigned long index; /* Index to determine the disk name */
444 
445 	unsigned long dd_flag; /* NOTE: use atomic bit operations on this */
446 
447 	struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
448 
449 	struct dentry *dfs_node;
450 
451 	bool sr;
452 
453 	int numa_node; /* NUMA support */
454 
455 	char workq_name[32];
456 
457 	struct workqueue_struct *isr_workq;
458 
459 	atomic_t irq_workers_active;
460 
461 	struct mtip_work work[MTIP_MAX_SLOT_GROUPS];
462 
463 	int isr_binding;
464 
465 	struct list_head online_list; /* linkage for online list */
466 
467 	struct list_head remove_list; /* linkage for removing list */
468 
469 	int unal_qdepth; /* qdepth of unaligned IO queue */
470 };
471 
472 #endif
473