1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright(c) 2020 Intel Corporation. */
3
4 #ifndef __CXL_H__
5 #define __CXL_H__
6
7 #include <linux/libnvdimm.h>
8 #include <linux/bitfield.h>
9 #include <linux/notifier.h>
10 #include <linux/bitops.h>
11 #include <linux/log2.h>
12 #include <linux/node.h>
13 #include <linux/io.h>
14
15 extern const struct nvdimm_security_ops *cxl_security_ops;
16
17 /**
18 * DOC: cxl objects
19 *
20 * The CXL core objects like ports, decoders, and regions are shared
21 * between the subsystem drivers cxl_acpi, cxl_pci, and core drivers
22 * (port-driver, region-driver, nvdimm object-drivers... etc).
23 */
24
25 /* CXL 2.0 8.2.4 CXL Component Register Layout and Definition */
26 #define CXL_COMPONENT_REG_BLOCK_SIZE SZ_64K
27
28 /* CXL 2.0 8.2.5 CXL.cache and CXL.mem Registers*/
29 #define CXL_CM_OFFSET 0x1000
30 #define CXL_CM_CAP_HDR_OFFSET 0x0
31 #define CXL_CM_CAP_HDR_ID_MASK GENMASK(15, 0)
32 #define CM_CAP_HDR_CAP_ID 1
33 #define CXL_CM_CAP_HDR_VERSION_MASK GENMASK(19, 16)
34 #define CM_CAP_HDR_CAP_VERSION 1
35 #define CXL_CM_CAP_HDR_CACHE_MEM_VERSION_MASK GENMASK(23, 20)
36 #define CM_CAP_HDR_CACHE_MEM_VERSION 1
37 #define CXL_CM_CAP_HDR_ARRAY_SIZE_MASK GENMASK(31, 24)
38 #define CXL_CM_CAP_PTR_MASK GENMASK(31, 20)
39
40 #define CXL_CM_CAP_CAP_ID_RAS 0x2
41 #define CXL_CM_CAP_CAP_ID_HDM 0x5
42 #define CXL_CM_CAP_CAP_HDM_VERSION 1
43
44 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */
45 #define CXL_HDM_DECODER_CAP_OFFSET 0x0
46 #define CXL_HDM_DECODER_COUNT_MASK GENMASK(3, 0)
47 #define CXL_HDM_DECODER_TARGET_COUNT_MASK GENMASK(7, 4)
48 #define CXL_HDM_DECODER_INTERLEAVE_11_8 BIT(8)
49 #define CXL_HDM_DECODER_INTERLEAVE_14_12 BIT(9)
50 #define CXL_HDM_DECODER_INTERLEAVE_3_6_12_WAY BIT(11)
51 #define CXL_HDM_DECODER_INTERLEAVE_16_WAY BIT(12)
52 #define CXL_HDM_DECODER_CTRL_OFFSET 0x4
53 #define CXL_HDM_DECODER_ENABLE BIT(1)
54 #define CXL_HDM_DECODER0_BASE_LOW_OFFSET(i) (0x20 * (i) + 0x10)
55 #define CXL_HDM_DECODER0_BASE_HIGH_OFFSET(i) (0x20 * (i) + 0x14)
56 #define CXL_HDM_DECODER0_SIZE_LOW_OFFSET(i) (0x20 * (i) + 0x18)
57 #define CXL_HDM_DECODER0_SIZE_HIGH_OFFSET(i) (0x20 * (i) + 0x1c)
58 #define CXL_HDM_DECODER0_CTRL_OFFSET(i) (0x20 * (i) + 0x20)
59 #define CXL_HDM_DECODER0_CTRL_IG_MASK GENMASK(3, 0)
60 #define CXL_HDM_DECODER0_CTRL_IW_MASK GENMASK(7, 4)
61 #define CXL_HDM_DECODER0_CTRL_LOCK BIT(8)
62 #define CXL_HDM_DECODER0_CTRL_COMMIT BIT(9)
63 #define CXL_HDM_DECODER0_CTRL_COMMITTED BIT(10)
64 #define CXL_HDM_DECODER0_CTRL_COMMIT_ERROR BIT(11)
65 #define CXL_HDM_DECODER0_CTRL_HOSTONLY BIT(12)
66 #define CXL_HDM_DECODER0_TL_LOW(i) (0x20 * (i) + 0x24)
67 #define CXL_HDM_DECODER0_TL_HIGH(i) (0x20 * (i) + 0x28)
68 #define CXL_HDM_DECODER0_SKIP_LOW(i) CXL_HDM_DECODER0_TL_LOW(i)
69 #define CXL_HDM_DECODER0_SKIP_HIGH(i) CXL_HDM_DECODER0_TL_HIGH(i)
70
71 /* HDM decoder control register constants CXL 3.0 8.2.5.19.7 */
72 #define CXL_DECODER_MIN_GRANULARITY 256
73 #define CXL_DECODER_MAX_ENCODED_IG 6
74
cxl_hdm_decoder_count(u32 cap_hdr)75 static inline int cxl_hdm_decoder_count(u32 cap_hdr)
76 {
77 int val = FIELD_GET(CXL_HDM_DECODER_COUNT_MASK, cap_hdr);
78
79 return val ? val * 2 : 1;
80 }
81
82 /* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */
eig_to_granularity(u16 eig,unsigned int * granularity)83 static inline int eig_to_granularity(u16 eig, unsigned int *granularity)
84 {
85 if (eig > CXL_DECODER_MAX_ENCODED_IG)
86 return -EINVAL;
87 *granularity = CXL_DECODER_MIN_GRANULARITY << eig;
88 return 0;
89 }
90
91 /* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */
eiw_to_ways(u8 eiw,unsigned int * ways)92 static inline int eiw_to_ways(u8 eiw, unsigned int *ways)
93 {
94 switch (eiw) {
95 case 0 ... 4:
96 *ways = 1 << eiw;
97 break;
98 case 8 ... 10:
99 *ways = 3 << (eiw - 8);
100 break;
101 default:
102 return -EINVAL;
103 }
104
105 return 0;
106 }
107
granularity_to_eig(int granularity,u16 * eig)108 static inline int granularity_to_eig(int granularity, u16 *eig)
109 {
110 if (granularity > SZ_16K || granularity < CXL_DECODER_MIN_GRANULARITY ||
111 !is_power_of_2(granularity))
112 return -EINVAL;
113 *eig = ilog2(granularity) - 8;
114 return 0;
115 }
116
ways_to_eiw(unsigned int ways,u8 * eiw)117 static inline int ways_to_eiw(unsigned int ways, u8 *eiw)
118 {
119 if (ways > 16)
120 return -EINVAL;
121 if (is_power_of_2(ways)) {
122 *eiw = ilog2(ways);
123 return 0;
124 }
125 if (ways % 3)
126 return -EINVAL;
127 ways /= 3;
128 if (!is_power_of_2(ways))
129 return -EINVAL;
130 *eiw = ilog2(ways) + 8;
131 return 0;
132 }
133
134 /* RAS Registers CXL 2.0 8.2.5.9 CXL RAS Capability Structure */
135 #define CXL_RAS_UNCORRECTABLE_STATUS_OFFSET 0x0
136 #define CXL_RAS_UNCORRECTABLE_STATUS_MASK (GENMASK(16, 14) | GENMASK(11, 0))
137 #define CXL_RAS_UNCORRECTABLE_MASK_OFFSET 0x4
138 #define CXL_RAS_UNCORRECTABLE_MASK_MASK (GENMASK(16, 14) | GENMASK(11, 0))
139 #define CXL_RAS_UNCORRECTABLE_MASK_F256B_MASK BIT(8)
140 #define CXL_RAS_UNCORRECTABLE_SEVERITY_OFFSET 0x8
141 #define CXL_RAS_UNCORRECTABLE_SEVERITY_MASK (GENMASK(16, 14) | GENMASK(11, 0))
142 #define CXL_RAS_CORRECTABLE_STATUS_OFFSET 0xC
143 #define CXL_RAS_CORRECTABLE_STATUS_MASK GENMASK(6, 0)
144 #define CXL_RAS_CORRECTABLE_MASK_OFFSET 0x10
145 #define CXL_RAS_CORRECTABLE_MASK_MASK GENMASK(6, 0)
146 #define CXL_RAS_CAP_CONTROL_OFFSET 0x14
147 #define CXL_RAS_CAP_CONTROL_FE_MASK GENMASK(5, 0)
148 #define CXL_RAS_HEADER_LOG_OFFSET 0x18
149 #define CXL_RAS_CAPABILITY_LENGTH 0x58
150 #define CXL_HEADERLOG_SIZE SZ_512
151 #define CXL_HEADERLOG_SIZE_U32 SZ_512 / sizeof(u32)
152
153 /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */
154 #define CXLDEV_CAP_ARRAY_OFFSET 0x0
155 #define CXLDEV_CAP_ARRAY_CAP_ID 0
156 #define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0)
157 #define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32)
158 /* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */
159 #define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0)
160 /* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */
161 #define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1
162 #define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2
163 #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3
164 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000
165
166 /* CXL 3.0 8.2.8.3.1 Event Status Register */
167 #define CXLDEV_DEV_EVENT_STATUS_OFFSET 0x00
168 #define CXLDEV_EVENT_STATUS_INFO BIT(0)
169 #define CXLDEV_EVENT_STATUS_WARN BIT(1)
170 #define CXLDEV_EVENT_STATUS_FAIL BIT(2)
171 #define CXLDEV_EVENT_STATUS_FATAL BIT(3)
172
173 #define CXLDEV_EVENT_STATUS_ALL (CXLDEV_EVENT_STATUS_INFO | \
174 CXLDEV_EVENT_STATUS_WARN | \
175 CXLDEV_EVENT_STATUS_FAIL | \
176 CXLDEV_EVENT_STATUS_FATAL)
177
178 /* CXL rev 3.0 section 8.2.9.2.4; Table 8-52 */
179 #define CXLDEV_EVENT_INT_MODE_MASK GENMASK(1, 0)
180 #define CXLDEV_EVENT_INT_MSGNUM_MASK GENMASK(7, 4)
181
182 /* CXL 2.0 8.2.8.4 Mailbox Registers */
183 #define CXLDEV_MBOX_CAPS_OFFSET 0x00
184 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0)
185 #define CXLDEV_MBOX_CAP_BG_CMD_IRQ BIT(6)
186 #define CXLDEV_MBOX_CAP_IRQ_MSGNUM_MASK GENMASK(10, 7)
187 #define CXLDEV_MBOX_CTRL_OFFSET 0x04
188 #define CXLDEV_MBOX_CTRL_DOORBELL BIT(0)
189 #define CXLDEV_MBOX_CTRL_BG_CMD_IRQ BIT(2)
190 #define CXLDEV_MBOX_CMD_OFFSET 0x08
191 #define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0)
192 #define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16)
193 #define CXLDEV_MBOX_STATUS_OFFSET 0x10
194 #define CXLDEV_MBOX_STATUS_BG_CMD BIT(0)
195 #define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32)
196 #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18
197 #define CXLDEV_MBOX_BG_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0)
198 #define CXLDEV_MBOX_BG_CMD_COMMAND_PCT_MASK GENMASK_ULL(22, 16)
199 #define CXLDEV_MBOX_BG_CMD_COMMAND_RC_MASK GENMASK_ULL(47, 32)
200 #define CXLDEV_MBOX_BG_CMD_COMMAND_VENDOR_MASK GENMASK_ULL(63, 48)
201 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20
202
203 /*
204 * Using struct_group() allows for per register-block-type helper routines,
205 * without requiring block-type agnostic code to include the prefix.
206 */
207 struct cxl_regs {
208 /*
209 * Common set of CXL Component register block base pointers
210 * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
211 * @ras: CXL 2.0 8.2.5.9 CXL RAS Capability Structure
212 */
213 struct_group_tagged(cxl_component_regs, component,
214 void __iomem *hdm_decoder;
215 void __iomem *ras;
216 );
217 /*
218 * Common set of CXL Device register block base pointers
219 * @status: CXL 2.0 8.2.8.3 Device Status Registers
220 * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
221 * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
222 */
223 struct_group_tagged(cxl_device_regs, device_regs,
224 void __iomem *status, *mbox, *memdev;
225 );
226
227 struct_group_tagged(cxl_pmu_regs, pmu_regs,
228 void __iomem *pmu;
229 );
230
231 /*
232 * RCH downstream port specific RAS register
233 * @aer: CXL 3.0 8.2.1.1 RCH Downstream Port RCRB
234 */
235 struct_group_tagged(cxl_rch_regs, rch_regs,
236 void __iomem *dport_aer;
237 );
238 };
239
240 struct cxl_reg_map {
241 bool valid;
242 int id;
243 unsigned long offset;
244 unsigned long size;
245 };
246
247 struct cxl_component_reg_map {
248 struct cxl_reg_map hdm_decoder;
249 struct cxl_reg_map ras;
250 };
251
252 struct cxl_device_reg_map {
253 struct cxl_reg_map status;
254 struct cxl_reg_map mbox;
255 struct cxl_reg_map memdev;
256 };
257
258 struct cxl_pmu_reg_map {
259 struct cxl_reg_map pmu;
260 };
261
262 /**
263 * struct cxl_register_map - DVSEC harvested register block mapping parameters
264 * @host: device for devm operations and logging
265 * @base: virtual base of the register-block-BAR + @block_offset
266 * @resource: physical resource base of the register block
267 * @max_size: maximum mapping size to perform register search
268 * @reg_type: see enum cxl_regloc_type
269 * @component_map: cxl_reg_map for component registers
270 * @device_map: cxl_reg_maps for device registers
271 * @pmu_map: cxl_reg_maps for CXL Performance Monitoring Units
272 */
273 struct cxl_register_map {
274 struct device *host;
275 void __iomem *base;
276 resource_size_t resource;
277 resource_size_t max_size;
278 u8 reg_type;
279 union {
280 struct cxl_component_reg_map component_map;
281 struct cxl_device_reg_map device_map;
282 struct cxl_pmu_reg_map pmu_map;
283 };
284 };
285
286 void cxl_probe_component_regs(struct device *dev, void __iomem *base,
287 struct cxl_component_reg_map *map);
288 void cxl_probe_device_regs(struct device *dev, void __iomem *base,
289 struct cxl_device_reg_map *map);
290 int cxl_map_component_regs(const struct cxl_register_map *map,
291 struct cxl_component_regs *regs,
292 unsigned long map_mask);
293 int cxl_map_device_regs(const struct cxl_register_map *map,
294 struct cxl_device_regs *regs);
295 int cxl_map_pmu_regs(struct cxl_register_map *map, struct cxl_pmu_regs *regs);
296
297 enum cxl_regloc_type;
298 int cxl_count_regblock(struct pci_dev *pdev, enum cxl_regloc_type type);
299 int cxl_find_regblock_instance(struct pci_dev *pdev, enum cxl_regloc_type type,
300 struct cxl_register_map *map, int index);
301 int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
302 struct cxl_register_map *map);
303 int cxl_setup_regs(struct cxl_register_map *map);
304 struct cxl_dport;
305 resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
306 struct cxl_dport *dport);
307
308 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
309 #define CXL_TARGET_STRLEN 20
310
311 /*
312 * cxl_decoder flags that define the type of memory / devices this
313 * decoder supports as well as configuration lock status See "CXL 2.0
314 * 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details.
315 * Additionally indicate whether decoder settings were autodetected,
316 * user customized.
317 */
318 #define CXL_DECODER_F_RAM BIT(0)
319 #define CXL_DECODER_F_PMEM BIT(1)
320 #define CXL_DECODER_F_TYPE2 BIT(2)
321 #define CXL_DECODER_F_TYPE3 BIT(3)
322 #define CXL_DECODER_F_LOCK BIT(4)
323 #define CXL_DECODER_F_ENABLE BIT(5)
324 #define CXL_DECODER_F_MASK GENMASK(5, 0)
325
326 enum cxl_decoder_type {
327 CXL_DECODER_DEVMEM = 2,
328 CXL_DECODER_HOSTONLYMEM = 3,
329 };
330
331 /*
332 * Current specification goes up to 8, double that seems a reasonable
333 * software max for the foreseeable future
334 */
335 #define CXL_DECODER_MAX_INTERLEAVE 16
336
337 #define CXL_QOS_CLASS_INVALID -1
338
339 /**
340 * struct cxl_decoder - Common CXL HDM Decoder Attributes
341 * @dev: this decoder's device
342 * @id: kernel device name id
343 * @hpa_range: Host physical address range mapped by this decoder
344 * @interleave_ways: number of cxl_dports in this decode
345 * @interleave_granularity: data stride per dport
346 * @target_type: accelerator vs expander (type2 vs type3) selector
347 * @region: currently assigned region for this decoder
348 * @flags: memory type capabilities and locking
349 * @commit: device/decoder-type specific callback to commit settings to hw
350 * @reset: device/decoder-type specific callback to reset hw settings
351 */
352 struct cxl_decoder {
353 struct device dev;
354 int id;
355 struct range hpa_range;
356 int interleave_ways;
357 int interleave_granularity;
358 enum cxl_decoder_type target_type;
359 struct cxl_region *region;
360 unsigned long flags;
361 int (*commit)(struct cxl_decoder *cxld);
362 int (*reset)(struct cxl_decoder *cxld);
363 };
364
365 /*
366 * CXL_DECODER_DEAD prevents endpoints from being reattached to regions
367 * while cxld_unregister() is running
368 */
369 enum cxl_decoder_mode {
370 CXL_DECODER_NONE,
371 CXL_DECODER_RAM,
372 CXL_DECODER_PMEM,
373 CXL_DECODER_MIXED,
374 CXL_DECODER_DEAD,
375 };
376
cxl_decoder_mode_name(enum cxl_decoder_mode mode)377 static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode)
378 {
379 static const char * const names[] = {
380 [CXL_DECODER_NONE] = "none",
381 [CXL_DECODER_RAM] = "ram",
382 [CXL_DECODER_PMEM] = "pmem",
383 [CXL_DECODER_MIXED] = "mixed",
384 };
385
386 if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED)
387 return names[mode];
388 return "mixed";
389 }
390
391 /*
392 * Track whether this decoder is reserved for region autodiscovery, or
393 * free for userspace provisioning.
394 */
395 enum cxl_decoder_state {
396 CXL_DECODER_STATE_MANUAL,
397 CXL_DECODER_STATE_AUTO,
398 };
399
400 /**
401 * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder
402 * @cxld: base cxl_decoder_object
403 * @dpa_res: actively claimed DPA span of this decoder
404 * @skip: offset into @dpa_res where @cxld.hpa_range maps
405 * @mode: which memory type / access-mode-partition this decoder targets
406 * @state: autodiscovery state
407 * @pos: interleave position in @cxld.region
408 */
409 struct cxl_endpoint_decoder {
410 struct cxl_decoder cxld;
411 struct resource *dpa_res;
412 resource_size_t skip;
413 enum cxl_decoder_mode mode;
414 enum cxl_decoder_state state;
415 int pos;
416 };
417
418 /**
419 * struct cxl_switch_decoder - Switch specific CXL HDM Decoder
420 * @cxld: base cxl_decoder object
421 * @nr_targets: number of elements in @target
422 * @target: active ordered target list in current decoder configuration
423 *
424 * The 'switch' decoder type represents the decoder instances of cxl_port's that
425 * route from the root of a CXL memory decode topology to the endpoints. They
426 * come in two flavors, root-level decoders, statically defined by platform
427 * firmware, and mid-level decoders, where interleave-granularity,
428 * interleave-width, and the target list are mutable.
429 */
430 struct cxl_switch_decoder {
431 struct cxl_decoder cxld;
432 int nr_targets;
433 struct cxl_dport *target[];
434 };
435
436 struct cxl_root_decoder;
437 typedef u64 (*cxl_hpa_to_spa_fn)(struct cxl_root_decoder *cxlrd, u64 hpa);
438
439 /**
440 * struct cxl_root_decoder - Static platform CXL address decoder
441 * @res: host / parent resource for region allocations
442 * @region_id: region id for next region provisioning event
443 * @hpa_to_spa: translate CXL host-physical-address to Platform system-physical-address
444 * @platform_data: platform specific configuration data
445 * @range_lock: sync region autodiscovery by address range
446 * @qos_class: QoS performance class cookie
447 * @cxlsd: base cxl switch decoder
448 */
449 struct cxl_root_decoder {
450 struct resource *res;
451 atomic_t region_id;
452 cxl_hpa_to_spa_fn hpa_to_spa;
453 void *platform_data;
454 struct mutex range_lock;
455 int qos_class;
456 struct cxl_switch_decoder cxlsd;
457 };
458
459 /*
460 * enum cxl_config_state - State machine for region configuration
461 * @CXL_CONFIG_IDLE: Any sysfs attribute can be written freely
462 * @CXL_CONFIG_INTERLEAVE_ACTIVE: region size has been set, no more
463 * changes to interleave_ways or interleave_granularity
464 * @CXL_CONFIG_ACTIVE: All targets have been added the region is now
465 * active
466 * @CXL_CONFIG_RESET_PENDING: see commit_store()
467 * @CXL_CONFIG_COMMIT: Soft-config has been committed to hardware
468 */
469 enum cxl_config_state {
470 CXL_CONFIG_IDLE,
471 CXL_CONFIG_INTERLEAVE_ACTIVE,
472 CXL_CONFIG_ACTIVE,
473 CXL_CONFIG_RESET_PENDING,
474 CXL_CONFIG_COMMIT,
475 };
476
477 /**
478 * struct cxl_region_params - region settings
479 * @state: allow the driver to lockdown further parameter changes
480 * @uuid: unique id for persistent regions
481 * @interleave_ways: number of endpoints in the region
482 * @interleave_granularity: capacity each endpoint contributes to a stripe
483 * @res: allocated iomem capacity for this region
484 * @targets: active ordered targets in current decoder configuration
485 * @nr_targets: number of targets
486 *
487 * State transitions are protected by the cxl_region_rwsem
488 */
489 struct cxl_region_params {
490 enum cxl_config_state state;
491 uuid_t uuid;
492 int interleave_ways;
493 int interleave_granularity;
494 struct resource *res;
495 struct cxl_endpoint_decoder *targets[CXL_DECODER_MAX_INTERLEAVE];
496 int nr_targets;
497 };
498
499 /*
500 * Indicate whether this region has been assembled by autodetection or
501 * userspace assembly. Prevent endpoint decoders outside of automatic
502 * detection from being added to the region.
503 */
504 #define CXL_REGION_F_AUTO 0
505
506 /*
507 * Require that a committed region successfully complete a teardown once
508 * any of its associated decoders have been torn down. This maintains
509 * the commit state for the region since there are committed decoders,
510 * but blocks cxl_region_probe().
511 */
512 #define CXL_REGION_F_NEEDS_RESET 1
513
514 /**
515 * struct cxl_region - CXL region
516 * @dev: This region's device
517 * @id: This region's id. Id is globally unique across all regions
518 * @mode: Endpoint decoder allocation / access mode
519 * @type: Endpoint decoder target type
520 * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown
521 * @cxlr_pmem: (for pmem regions) cached copy of the nvdimm bridge
522 * @flags: Region state flags
523 * @params: active + config params for the region
524 * @coord: QoS access coordinates for the region
525 * @memory_notifier: notifier for setting the access coordinates to node
526 * @adist_notifier: notifier for calculating the abstract distance of node
527 */
528 struct cxl_region {
529 struct device dev;
530 int id;
531 enum cxl_decoder_mode mode;
532 enum cxl_decoder_type type;
533 struct cxl_nvdimm_bridge *cxl_nvb;
534 struct cxl_pmem_region *cxlr_pmem;
535 unsigned long flags;
536 struct cxl_region_params params;
537 struct access_coordinate coord[ACCESS_COORDINATE_MAX];
538 struct notifier_block memory_notifier;
539 struct notifier_block adist_notifier;
540 };
541
542 struct cxl_nvdimm_bridge {
543 int id;
544 struct device dev;
545 struct cxl_port *port;
546 struct nvdimm_bus *nvdimm_bus;
547 struct nvdimm_bus_descriptor nd_desc;
548 };
549
550 #define CXL_DEV_ID_LEN 19
551
552 struct cxl_nvdimm {
553 struct device dev;
554 struct cxl_memdev *cxlmd;
555 u8 dev_id[CXL_DEV_ID_LEN]; /* for nvdimm, string of 'serial' */
556 };
557
558 struct cxl_pmem_region_mapping {
559 struct cxl_memdev *cxlmd;
560 struct cxl_nvdimm *cxl_nvd;
561 u64 start;
562 u64 size;
563 int position;
564 };
565
566 struct cxl_pmem_region {
567 struct device dev;
568 struct cxl_region *cxlr;
569 struct nd_region *nd_region;
570 struct range hpa_range;
571 int nr_mappings;
572 struct cxl_pmem_region_mapping mapping[];
573 };
574
575 struct cxl_dax_region {
576 struct device dev;
577 struct cxl_region *cxlr;
578 struct range hpa_range;
579 };
580
581 /**
582 * struct cxl_port - logical collection of upstream port devices and
583 * downstream port devices to construct a CXL memory
584 * decode hierarchy.
585 * @dev: this port's device
586 * @uport_dev: PCI or platform device implementing the upstream port capability
587 * @host_bridge: Shortcut to the platform attach point for this port
588 * @id: id for port device-name
589 * @dports: cxl_dport instances referenced by decoders
590 * @endpoints: cxl_ep instances, endpoints that are a descendant of this port
591 * @regions: cxl_region_ref instances, regions mapped by this port
592 * @parent_dport: dport that points to this port in the parent
593 * @decoder_ida: allocator for decoder ids
594 * @reg_map: component and ras register mapping parameters
595 * @nr_dports: number of entries in @dports
596 * @hdm_end: track last allocated HDM decoder instance for allocation ordering
597 * @commit_end: cursor to track highest committed decoder for commit ordering
598 * @dead: last ep has been removed, force port re-creation
599 * @depth: How deep this port is relative to the root. depth 0 is the root.
600 * @cdat: Cached CDAT data
601 * @cdat_available: Should a CDAT attribute be available in sysfs
602 * @pci_latency: Upstream latency in picoseconds
603 */
604 struct cxl_port {
605 struct device dev;
606 struct device *uport_dev;
607 struct device *host_bridge;
608 int id;
609 struct xarray dports;
610 struct xarray endpoints;
611 struct xarray regions;
612 struct cxl_dport *parent_dport;
613 struct ida decoder_ida;
614 struct cxl_register_map reg_map;
615 int nr_dports;
616 int hdm_end;
617 int commit_end;
618 bool dead;
619 unsigned int depth;
620 struct cxl_cdat {
621 void *table;
622 size_t length;
623 } cdat;
624 bool cdat_available;
625 long pci_latency;
626 };
627
628 /**
629 * struct cxl_root - logical collection of root cxl_port items
630 *
631 * @port: cxl_port member
632 * @ops: cxl root operations
633 */
634 struct cxl_root {
635 struct cxl_port port;
636 const struct cxl_root_ops *ops;
637 };
638
639 static inline struct cxl_root *
to_cxl_root(const struct cxl_port * port)640 to_cxl_root(const struct cxl_port *port)
641 {
642 return container_of(port, struct cxl_root, port);
643 }
644
645 struct cxl_root_ops {
646 int (*qos_class)(struct cxl_root *cxl_root,
647 struct access_coordinate *coord, int entries,
648 int *qos_class);
649 };
650
651 static inline struct cxl_dport *
cxl_find_dport_by_dev(struct cxl_port * port,const struct device * dport_dev)652 cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev)
653 {
654 return xa_load(&port->dports, (unsigned long)dport_dev);
655 }
656
657 struct cxl_rcrb_info {
658 resource_size_t base;
659 u16 aer_cap;
660 };
661
662 /**
663 * struct cxl_dport - CXL downstream port
664 * @dport_dev: PCI bridge or firmware device representing the downstream link
665 * @reg_map: component and ras register mapping parameters
666 * @port_id: unique hardware identifier for dport in decoder target list
667 * @rcrb: Data about the Root Complex Register Block layout
668 * @rch: Indicate whether this dport was enumerated in RCH or VH mode
669 * @port: reference to cxl_port that contains this downstream port
670 * @regs: Dport parsed register blocks
671 * @coord: access coordinates (bandwidth and latency performance attributes)
672 * @link_latency: calculated PCIe downstream latency
673 */
674 struct cxl_dport {
675 struct device *dport_dev;
676 struct cxl_register_map reg_map;
677 int port_id;
678 struct cxl_rcrb_info rcrb;
679 bool rch;
680 struct cxl_port *port;
681 struct cxl_regs regs;
682 struct access_coordinate coord[ACCESS_COORDINATE_MAX];
683 long link_latency;
684 };
685
686 /**
687 * struct cxl_ep - track an endpoint's interest in a port
688 * @ep: device that hosts a generic CXL endpoint (expander or accelerator)
689 * @dport: which dport routes to this endpoint on @port
690 * @next: cxl switch port across the link attached to @dport NULL if
691 * attached to an endpoint
692 */
693 struct cxl_ep {
694 struct device *ep;
695 struct cxl_dport *dport;
696 struct cxl_port *next;
697 };
698
699 /**
700 * struct cxl_region_ref - track a region's interest in a port
701 * @port: point in topology to install this reference
702 * @decoder: decoder assigned for @region in @port
703 * @region: region for this reference
704 * @endpoints: cxl_ep references for region members beneath @port
705 * @nr_targets_set: track how many targets have been programmed during setup
706 * @nr_eps: number of endpoints beneath @port
707 * @nr_targets: number of distinct targets needed to reach @nr_eps
708 */
709 struct cxl_region_ref {
710 struct cxl_port *port;
711 struct cxl_decoder *decoder;
712 struct cxl_region *region;
713 struct xarray endpoints;
714 int nr_targets_set;
715 int nr_eps;
716 int nr_targets;
717 };
718
719 /*
720 * The platform firmware device hosting the root is also the top of the
721 * CXL port topology. All other CXL ports have another CXL port as their
722 * parent and their ->uport_dev / host device is out-of-line of the port
723 * ancestry.
724 */
is_cxl_root(struct cxl_port * port)725 static inline bool is_cxl_root(struct cxl_port *port)
726 {
727 return port->uport_dev == port->dev.parent;
728 }
729
730 int cxl_num_decoders_committed(struct cxl_port *port);
731 bool is_cxl_port(const struct device *dev);
732 struct cxl_port *to_cxl_port(const struct device *dev);
733 struct pci_bus;
734 int devm_cxl_register_pci_bus(struct device *host, struct device *uport_dev,
735 struct pci_bus *bus);
736 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port);
737 struct cxl_port *devm_cxl_add_port(struct device *host,
738 struct device *uport_dev,
739 resource_size_t component_reg_phys,
740 struct cxl_dport *parent_dport);
741 struct cxl_root *devm_cxl_add_root(struct device *host,
742 const struct cxl_root_ops *ops);
743 struct cxl_root *find_cxl_root(struct cxl_port *port);
744 void put_cxl_root(struct cxl_root *cxl_root);
745 DEFINE_FREE(put_cxl_root, struct cxl_root *, if (_T) put_cxl_root(_T))
746
747 int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd);
748 void cxl_bus_rescan(void);
749 void cxl_bus_drain(void);
750 struct cxl_port *cxl_pci_find_port(struct pci_dev *pdev,
751 struct cxl_dport **dport);
752 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd,
753 struct cxl_dport **dport);
754 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd);
755
756 struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
757 struct device *dport, int port_id,
758 resource_size_t component_reg_phys);
759 struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
760 struct device *dport_dev, int port_id,
761 resource_size_t rcrb);
762
763 #ifdef CONFIG_PCIEAER_CXL
764 void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport);
765 #else
cxl_setup_parent_dport(struct device * host,struct cxl_dport * dport)766 static inline void cxl_setup_parent_dport(struct device *host,
767 struct cxl_dport *dport) { }
768 #endif
769
770 struct cxl_decoder *to_cxl_decoder(struct device *dev);
771 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev);
772 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev);
773 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev);
774 bool is_root_decoder(struct device *dev);
775 bool is_switch_decoder(struct device *dev);
776 bool is_endpoint_decoder(struct device *dev);
777 struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
778 unsigned int nr_targets);
779 struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port,
780 unsigned int nr_targets);
781 int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map);
782 struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port);
783 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map);
784 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld);
cxl_root_decoder_autoremove(struct device * host,struct cxl_root_decoder * cxlrd)785 static inline int cxl_root_decoder_autoremove(struct device *host,
786 struct cxl_root_decoder *cxlrd)
787 {
788 return cxl_decoder_autoremove(host, &cxlrd->cxlsd.cxld);
789 }
790 int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint);
791
792 /**
793 * struct cxl_endpoint_dvsec_info - Cached DVSEC info
794 * @mem_enabled: cached value of mem_enabled in the DVSEC at init time
795 * @ranges: Number of active HDM ranges this device uses.
796 * @port: endpoint port associated with this info instance
797 * @dvsec_range: cached attributes of the ranges in the DVSEC, PCIE_DEVICE
798 */
799 struct cxl_endpoint_dvsec_info {
800 bool mem_enabled;
801 int ranges;
802 struct cxl_port *port;
803 struct range dvsec_range[2];
804 };
805
806 struct cxl_hdm;
807 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
808 struct cxl_endpoint_dvsec_info *info);
809 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
810 struct cxl_endpoint_dvsec_info *info);
811 int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
812 int cxl_dvsec_rr_decode(struct device *dev, int dvsec,
813 struct cxl_endpoint_dvsec_info *info);
814
815 bool is_cxl_region(struct device *dev);
816
817 extern struct bus_type cxl_bus_type;
818
819 struct cxl_driver {
820 const char *name;
821 int (*probe)(struct device *dev);
822 void (*remove)(struct device *dev);
823 struct device_driver drv;
824 int id;
825 };
826
827 #define to_cxl_drv(__drv) container_of_const(__drv, struct cxl_driver, drv)
828
829 int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
830 const char *modname);
831 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
832 void cxl_driver_unregister(struct cxl_driver *cxl_drv);
833
834 #define module_cxl_driver(__cxl_driver) \
835 module_driver(__cxl_driver, cxl_driver_register, cxl_driver_unregister)
836
837 #define CXL_DEVICE_NVDIMM_BRIDGE 1
838 #define CXL_DEVICE_NVDIMM 2
839 #define CXL_DEVICE_PORT 3
840 #define CXL_DEVICE_ROOT 4
841 #define CXL_DEVICE_MEMORY_EXPANDER 5
842 #define CXL_DEVICE_REGION 6
843 #define CXL_DEVICE_PMEM_REGION 7
844 #define CXL_DEVICE_DAX_REGION 8
845 #define CXL_DEVICE_PMU 9
846
847 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
848 #define CXL_MODALIAS_FMT "cxl:t%d"
849
850 struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev);
851 struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
852 struct cxl_port *port);
853 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev);
854 bool is_cxl_nvdimm(struct device *dev);
855 bool is_cxl_nvdimm_bridge(struct device *dev);
856 int devm_cxl_add_nvdimm(struct cxl_port *parent_port, struct cxl_memdev *cxlmd);
857 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_port *port);
858
859 #ifdef CONFIG_CXL_REGION
860 bool is_cxl_pmem_region(struct device *dev);
861 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev);
862 int cxl_add_to_region(struct cxl_port *root,
863 struct cxl_endpoint_decoder *cxled);
864 struct cxl_dax_region *to_cxl_dax_region(struct device *dev);
865 #else
is_cxl_pmem_region(struct device * dev)866 static inline bool is_cxl_pmem_region(struct device *dev)
867 {
868 return false;
869 }
to_cxl_pmem_region(struct device * dev)870 static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev)
871 {
872 return NULL;
873 }
cxl_add_to_region(struct cxl_port * root,struct cxl_endpoint_decoder * cxled)874 static inline int cxl_add_to_region(struct cxl_port *root,
875 struct cxl_endpoint_decoder *cxled)
876 {
877 return 0;
878 }
to_cxl_dax_region(struct device * dev)879 static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev)
880 {
881 return NULL;
882 }
883 #endif
884
885 void cxl_endpoint_parse_cdat(struct cxl_port *port);
886 void cxl_switch_parse_cdat(struct cxl_port *port);
887
888 int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
889 struct access_coordinate *coord);
890 void cxl_region_perf_data_calculate(struct cxl_region *cxlr,
891 struct cxl_endpoint_decoder *cxled);
892
893 void cxl_memdev_update_perf(struct cxl_memdev *cxlmd);
894
895 void cxl_coordinates_combine(struct access_coordinate *out,
896 struct access_coordinate *c1,
897 struct access_coordinate *c2);
898
899 bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port);
900
901 /*
902 * Unit test builds overrides this to __weak, find the 'strong' version
903 * of these symbols in tools/testing/cxl/.
904 */
905 #ifndef __mock
906 #define __mock static
907 #endif
908
909 #endif /* __CXL_H__ */
910