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 #include <linux/genhd.h>
19 
20 /* Offset of Subsystem Device ID in pci confoguration space */
21 #define PCI_SUBSYSTEM_DEVICEID	0x2E
22 
23 /* offset of Device Control register in PCIe extended capabilites space */
24 #define PCIE_CONFIG_EXT_DEVICE_CONTROL_OFFSET	0x48
25 
26 /* check for erase mode support during secure erase */
27 #define MTIP_SEC_ERASE_MODE     0x2
28 
29 /* # of times to retry timed out/failed IOs */
30 #define MTIP_MAX_RETRIES	2
31 
32 /* Various timeout values in ms */
33 #define MTIP_NCQ_CMD_TIMEOUT_MS      15000
34 #define MTIP_IOCTL_CMD_TIMEOUT_MS    5000
35 #define MTIP_INT_CMD_TIMEOUT_MS      5000
36 #define MTIP_QUIESCE_IO_TIMEOUT_MS   (MTIP_NCQ_CMD_TIMEOUT_MS * \
37 				     (MTIP_MAX_RETRIES + 1))
38 
39 /* check for timeouts every 500ms */
40 #define MTIP_TIMEOUT_CHECK_PERIOD	500
41 
42 /* ftl rebuild */
43 #define MTIP_FTL_REBUILD_OFFSET		142
44 #define MTIP_FTL_REBUILD_MAGIC		0xED51
45 #define MTIP_FTL_REBUILD_TIMEOUT_MS	2400000
46 
47 /* unaligned IO handling */
48 #define MTIP_MAX_UNALIGNED_SLOTS	2
49 
50 /* Macro to extract the tag bit number from a tag value. */
51 #define MTIP_TAG_BIT(tag)	(tag & 0x1F)
52 
53 /*
54  * Macro to extract the tag index from a tag value. The index
55  * is used to access the correct s_active/Command Issue register based
56  * on the tag value.
57  */
58 #define MTIP_TAG_INDEX(tag)	(tag >> 5)
59 
60 /*
61  * Maximum number of scatter gather entries
62  * a single command may have.
63  */
64 #define MTIP_MAX_SG		504
65 
66 /*
67  * Maximum number of slot groups (Command Issue & s_active registers)
68  * NOTE: This is the driver maximum; check dd->slot_groups for actual value.
69  */
70 #define MTIP_MAX_SLOT_GROUPS	8
71 
72 /* Internal command tag. */
73 #define MTIP_TAG_INTERNAL	0
74 
75 /* Micron Vendor ID & P320x SSD Device ID */
76 #define PCI_VENDOR_ID_MICRON    0x1344
77 #define P320H_DEVICE_ID		0x5150
78 #define P320M_DEVICE_ID		0x5151
79 #define P320S_DEVICE_ID		0x5152
80 #define P325M_DEVICE_ID		0x5153
81 #define P420H_DEVICE_ID		0x5160
82 #define P420M_DEVICE_ID		0x5161
83 #define P425M_DEVICE_ID		0x5163
84 
85 /* Driver name and version strings */
86 #define MTIP_DRV_NAME		"mtip32xx"
87 #define MTIP_DRV_VERSION	"1.3.1"
88 
89 /* Maximum number of minor device numbers per device. */
90 #define MTIP_MAX_MINORS		16
91 
92 /* Maximum number of supported command slots. */
93 #define MTIP_MAX_COMMAND_SLOTS	(MTIP_MAX_SLOT_GROUPS * 32)
94 
95 /*
96  * Per-tag bitfield size in longs.
97  * Linux bit manipulation functions
98  * (i.e. test_and_set_bit, find_next_zero_bit)
99  * manipulate memory in longs, so we try to make the math work.
100  * take the slot groups and find the number of longs, rounding up.
101  * Careful! i386 and x86_64 use different size longs!
102  */
103 #define U32_PER_LONG	(sizeof(long) / sizeof(u32))
104 #define SLOTBITS_IN_LONGS ((MTIP_MAX_SLOT_GROUPS + \
105 					(U32_PER_LONG-1))/U32_PER_LONG)
106 
107 /* BAR number used to access the HBA registers. */
108 #define MTIP_ABAR		5
109 
110 #ifdef DEBUG
111  #define dbg_printk(format, arg...)	\
112 	printk(pr_fmt(format), ##arg);
113 #else
114  #define dbg_printk(format, arg...)
115 #endif
116 
117 #define MTIP_DFS_MAX_BUF_SIZE 1024
118 
119 enum {
120 	/* below are bit numbers in 'flags' defined in mtip_port */
121 	MTIP_PF_IC_ACTIVE_BIT       = 0, /* pio/ioctl */
122 	MTIP_PF_EH_ACTIVE_BIT       = 1, /* error handling */
123 	MTIP_PF_SE_ACTIVE_BIT       = 2, /* secure erase */
124 	MTIP_PF_DM_ACTIVE_BIT       = 3, /* download microcde */
125 	MTIP_PF_TO_ACTIVE_BIT       = 9, /* timeout handling */
126 	MTIP_PF_PAUSE_IO      =	((1 << MTIP_PF_IC_ACTIVE_BIT) |
127 				(1 << MTIP_PF_EH_ACTIVE_BIT) |
128 				(1 << MTIP_PF_SE_ACTIVE_BIT) |
129 				(1 << MTIP_PF_DM_ACTIVE_BIT) |
130 				(1 << MTIP_PF_TO_ACTIVE_BIT)),
131 	MTIP_PF_HOST_CAP_64         = 10, /* cache HOST_CAP_64 */
132 
133 	MTIP_PF_SVC_THD_ACTIVE_BIT  = 4,
134 	MTIP_PF_ISSUE_CMDS_BIT      = 5,
135 	MTIP_PF_REBUILD_BIT         = 6,
136 	MTIP_PF_SVC_THD_STOP_BIT    = 8,
137 
138 	MTIP_PF_SVC_THD_WORK	= ((1 << MTIP_PF_EH_ACTIVE_BIT) |
139 				  (1 << MTIP_PF_ISSUE_CMDS_BIT) |
140 				  (1 << MTIP_PF_REBUILD_BIT) |
141 				  (1 << MTIP_PF_SVC_THD_STOP_BIT) |
142 				  (1 << MTIP_PF_TO_ACTIVE_BIT)),
143 
144 	/* below are bit numbers in 'dd_flag' defined in driver_data */
145 	MTIP_DDF_SEC_LOCK_BIT	    = 0,
146 	MTIP_DDF_REMOVE_PENDING_BIT = 1,
147 	MTIP_DDF_OVER_TEMP_BIT      = 2,
148 	MTIP_DDF_WRITE_PROTECT_BIT  = 3,
149 	MTIP_DDF_CLEANUP_BIT        = 5,
150 	MTIP_DDF_RESUME_BIT         = 6,
151 	MTIP_DDF_INIT_DONE_BIT      = 7,
152 	MTIP_DDF_REBUILD_FAILED_BIT = 8,
153 	MTIP_DDF_REMOVAL_BIT	    = 9,
154 
155 	MTIP_DDF_STOP_IO      = ((1 << MTIP_DDF_REMOVE_PENDING_BIT) |
156 				(1 << MTIP_DDF_SEC_LOCK_BIT) |
157 				(1 << MTIP_DDF_OVER_TEMP_BIT) |
158 				(1 << MTIP_DDF_WRITE_PROTECT_BIT) |
159 				(1 << MTIP_DDF_REBUILD_FAILED_BIT)),
160 
161 };
162 
163 struct smart_attr {
164 	u8 attr_id;
165 	__le16 flags;
166 	u8 cur;
167 	u8 worst;
168 	__le32 data;
169 	u8 res[3];
170 } __packed;
171 
172 struct mtip_work {
173 	struct work_struct work;
174 	void *port;
175 	int cpu_binding;
176 	u32 completed;
177 } ____cacheline_aligned_in_smp;
178 
179 #define DEFINE_HANDLER(group)                                  \
180 	void mtip_workq_sdbf##group(struct work_struct *work)       \
181 	{                                                      \
182 		struct mtip_work *w = (struct mtip_work *) work;         \
183 		mtip_workq_sdbfx(w->port, group, w->completed);     \
184 	}
185 
186 /* Register Frame Information Structure (FIS), host to device. */
187 struct host_to_dev_fis {
188 	/*
189 	 * FIS type.
190 	 * - 27h Register FIS, host to device.
191 	 * - 34h Register FIS, device to host.
192 	 * - 39h DMA Activate FIS, device to host.
193 	 * - 41h DMA Setup FIS, bi-directional.
194 	 * - 46h Data FIS, bi-directional.
195 	 * - 58h BIST Activate FIS, bi-directional.
196 	 * - 5Fh PIO Setup FIS, device to host.
197 	 * - A1h Set Device Bits FIS, device to host.
198 	 */
199 	unsigned char type;
200 	unsigned char opts;
201 	unsigned char command;
202 	unsigned char features;
203 
204 	union {
205 		unsigned char lba_low;
206 		unsigned char sector;
207 	};
208 	union {
209 		unsigned char lba_mid;
210 		unsigned char cyl_low;
211 	};
212 	union {
213 		unsigned char lba_hi;
214 		unsigned char cyl_hi;
215 	};
216 	union {
217 		unsigned char device;
218 		unsigned char head;
219 	};
220 
221 	union {
222 		unsigned char lba_low_ex;
223 		unsigned char sector_ex;
224 	};
225 	union {
226 		unsigned char lba_mid_ex;
227 		unsigned char cyl_low_ex;
228 	};
229 	union {
230 		unsigned char lba_hi_ex;
231 		unsigned char cyl_hi_ex;
232 	};
233 	unsigned char features_ex;
234 
235 	unsigned char sect_count;
236 	unsigned char sect_cnt_ex;
237 	unsigned char res2;
238 	unsigned char control;
239 
240 	unsigned int res3;
241 };
242 
243 /* Command header structure. */
244 struct mtip_cmd_hdr {
245 	/*
246 	 * Command options.
247 	 * - Bits 31:16 Number of PRD entries.
248 	 * - Bits 15:8 Unused in this implementation.
249 	 * - Bit 7 Prefetch bit, informs the drive to prefetch PRD entries.
250 	 * - Bit 6 Write bit, should be set when writing data to the device.
251 	 * - Bit 5 Unused in this implementation.
252 	 * - Bits 4:0 Length of the command FIS in DWords (DWord = 4 bytes).
253 	 */
254 	__le32 opts;
255 	/* This field is unsed when using NCQ. */
256 	union {
257 		__le32 byte_count;
258 		__le32 status;
259 	};
260 	/*
261 	 * Lower 32 bits of the command table address associated with this
262 	 * header. The command table addresses must be 128 byte aligned.
263 	 */
264 	__le32 ctba;
265 	/*
266 	 * If 64 bit addressing is used this field is the upper 32 bits
267 	 * of the command table address associated with this command.
268 	 */
269 	__le32 ctbau;
270 	/* Reserved and unused. */
271 	u32 res[4];
272 };
273 
274 /* Command scatter gather structure (PRD). */
275 struct mtip_cmd_sg {
276 	/*
277 	 * Low 32 bits of the data buffer address. For P320 this
278 	 * address must be 8 byte aligned signified by bits 2:0 being
279 	 * set to 0.
280 	 */
281 	__le32 dba;
282 	/*
283 	 * When 64 bit addressing is used this field is the upper
284 	 * 32 bits of the data buffer address.
285 	 */
286 	__le32 dba_upper;
287 	/* Unused. */
288 	__le32 reserved;
289 	/*
290 	 * Bit 31: interrupt when this data block has been transferred.
291 	 * Bits 30..22: reserved
292 	 * Bits 21..0: byte count (minus 1).  For P320 the byte count must be
293 	 * 8 byte aligned signified by bits 2:0 being set to 1.
294 	 */
295 	__le32 info;
296 };
297 struct mtip_port;
298 
299 struct mtip_int_cmd;
300 
301 /* Structure used to describe a command. */
302 struct mtip_cmd {
303 	void *command; /* ptr to command table entry */
304 
305 	dma_addr_t command_dma; /* corresponding physical address */
306 
307 	int scatter_ents; /* Number of scatter list entries used */
308 
309 	int unaligned; /* command is unaligned on 4k boundary */
310 
311 	union {
312 		struct scatterlist sg[MTIP_MAX_SG]; /* Scatter list entries */
313 		struct mtip_int_cmd *icmd;
314 	};
315 
316 	int retries; /* The number of retries left for this command. */
317 
318 	int direction; /* Data transfer direction */
319 	blk_status_t status;
320 };
321 
322 /* Structure used to describe a port. */
323 struct mtip_port {
324 	/* Pointer back to the driver data for this port. */
325 	struct driver_data *dd;
326 	/*
327 	 * Used to determine if the data pointed to by the
328 	 * identify field is valid.
329 	 */
330 	unsigned long identify_valid;
331 	/* Base address of the memory mapped IO for the port. */
332 	void __iomem *mmio;
333 	/* Array of pointers to the memory mapped s_active registers. */
334 	void __iomem *s_active[MTIP_MAX_SLOT_GROUPS];
335 	/* Array of pointers to the memory mapped completed registers. */
336 	void __iomem *completed[MTIP_MAX_SLOT_GROUPS];
337 	/* Array of pointers to the memory mapped Command Issue registers. */
338 	void __iomem *cmd_issue[MTIP_MAX_SLOT_GROUPS];
339 	/*
340 	 * Pointer to the beginning of the command header memory as used
341 	 * by the driver.
342 	 */
343 	void *command_list;
344 	/*
345 	 * Pointer to the beginning of the command header memory as used
346 	 * by the DMA.
347 	 */
348 	dma_addr_t command_list_dma;
349 	/*
350 	 * Pointer to the beginning of the RX FIS memory as used
351 	 * by the driver.
352 	 */
353 	void *rxfis;
354 	/*
355 	 * Pointer to the beginning of the RX FIS memory as used
356 	 * by the DMA.
357 	 */
358 	dma_addr_t rxfis_dma;
359 	/*
360 	 * Pointer to the DMA region for RX Fis, Identify, RLE10, and SMART
361 	 */
362 	void *block1;
363 	/*
364 	 * DMA address of region for RX Fis, Identify, RLE10, and SMART
365 	 */
366 	dma_addr_t block1_dma;
367 	/*
368 	 * Pointer to the beginning of the identify data memory as used
369 	 * by the driver.
370 	 */
371 	u16 *identify;
372 	/*
373 	 * Pointer to the beginning of the identify data memory as used
374 	 * by the DMA.
375 	 */
376 	dma_addr_t identify_dma;
377 	/*
378 	 * Pointer to the beginning of a sector buffer that is used
379 	 * by the driver when issuing internal commands.
380 	 */
381 	u16 *sector_buffer;
382 	/*
383 	 * Pointer to the beginning of a sector buffer that is used
384 	 * by the DMA when the driver issues internal commands.
385 	 */
386 	dma_addr_t sector_buffer_dma;
387 
388 	u16 *log_buf;
389 	dma_addr_t log_buf_dma;
390 
391 	u8 *smart_buf;
392 	dma_addr_t smart_buf_dma;
393 
394 	/*
395 	 * used to queue commands when an internal command is in progress
396 	 * or error handling is active
397 	 */
398 	unsigned long cmds_to_issue[SLOTBITS_IN_LONGS];
399 	/* Used by mtip_service_thread to wait for an event */
400 	wait_queue_head_t svc_wait;
401 	/*
402 	 * indicates the state of the port. Also, helps the service thread
403 	 * to determine its action on wake up.
404 	 */
405 	unsigned long flags;
406 	/*
407 	 * Timer used to complete commands that have been active for too long.
408 	 */
409 	unsigned long ic_pause_timer;
410 
411 	/* Counter to control queue depth of unaligned IOs */
412 	atomic_t cmd_slot_unal;
413 
414 	/* Spinlock for working around command-issue bug. */
415 	spinlock_t cmd_issue_lock[MTIP_MAX_SLOT_GROUPS];
416 };
417 
418 /*
419  * Driver private data structure.
420  *
421  * One structure is allocated per probed device.
422  */
423 struct driver_data {
424 	void __iomem *mmio; /* Base address of the HBA registers. */
425 
426 	int major; /* Major device number. */
427 
428 	int instance; /* Instance number. First device probed is 0, ... */
429 
430 	struct gendisk *disk; /* Pointer to our gendisk structure. */
431 
432 	struct pci_dev *pdev; /* Pointer to the PCI device structure. */
433 
434 	struct request_queue *queue; /* Our request queue. */
435 
436 	struct blk_mq_tag_set tags; /* blk_mq tags */
437 
438 	struct mtip_port *port; /* Pointer to the port data structure. */
439 
440 	unsigned product_type; /* magic value declaring the product type */
441 
442 	unsigned slot_groups; /* number of slot groups the product supports */
443 
444 	unsigned long index; /* Index to determine the disk name */
445 
446 	unsigned long dd_flag; /* NOTE: use atomic bit operations on this */
447 
448 	struct task_struct *mtip_svc_handler; /* task_struct of svc thd */
449 
450 	struct dentry *dfs_node;
451 
452 	bool sr;
453 
454 	int numa_node; /* NUMA support */
455 
456 	char workq_name[32];
457 
458 	struct workqueue_struct *isr_workq;
459 
460 	atomic_t irq_workers_active;
461 
462 	struct mtip_work work[MTIP_MAX_SLOT_GROUPS];
463 
464 	int isr_binding;
465 
466 	struct block_device *bdev;
467 
468 	struct list_head online_list; /* linkage for online list */
469 
470 	struct list_head remove_list; /* linkage for removing list */
471 
472 	int unal_qdepth; /* qdepth of unaligned IO queue */
473 };
474 
475 #endif
476