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 * RCD upstream port specific PCIe cap register
241 * @pcie_cap: CXL 3.0 8.2.1.2 RCD Upstream Port RCRB
242 */
243 struct_group_tagged(cxl_rcd_regs, rcd_regs,
244 void __iomem *rcd_pcie_cap;
245 );
246 };
247
248 struct cxl_reg_map {
249 bool valid;
250 int id;
251 unsigned long offset;
252 unsigned long size;
253 };
254
255 struct cxl_component_reg_map {
256 struct cxl_reg_map hdm_decoder;
257 struct cxl_reg_map ras;
258 };
259
260 struct cxl_device_reg_map {
261 struct cxl_reg_map status;
262 struct cxl_reg_map mbox;
263 struct cxl_reg_map memdev;
264 };
265
266 struct cxl_pmu_reg_map {
267 struct cxl_reg_map pmu;
268 };
269
270 /**
271 * struct cxl_register_map - DVSEC harvested register block mapping parameters
272 * @host: device for devm operations and logging
273 * @base: virtual base of the register-block-BAR + @block_offset
274 * @resource: physical resource base of the register block
275 * @max_size: maximum mapping size to perform register search
276 * @reg_type: see enum cxl_regloc_type
277 * @component_map: cxl_reg_map for component registers
278 * @device_map: cxl_reg_maps for device registers
279 * @pmu_map: cxl_reg_maps for CXL Performance Monitoring Units
280 */
281 struct cxl_register_map {
282 struct device *host;
283 void __iomem *base;
284 resource_size_t resource;
285 resource_size_t max_size;
286 u8 reg_type;
287 union {
288 struct cxl_component_reg_map component_map;
289 struct cxl_device_reg_map device_map;
290 struct cxl_pmu_reg_map pmu_map;
291 };
292 };
293
294 void cxl_probe_component_regs(struct device *dev, void __iomem *base,
295 struct cxl_component_reg_map *map);
296 void cxl_probe_device_regs(struct device *dev, void __iomem *base,
297 struct cxl_device_reg_map *map);
298 int cxl_map_component_regs(const struct cxl_register_map *map,
299 struct cxl_component_regs *regs,
300 unsigned long map_mask);
301 int cxl_map_device_regs(const struct cxl_register_map *map,
302 struct cxl_device_regs *regs);
303 int cxl_map_pmu_regs(struct cxl_register_map *map, struct cxl_pmu_regs *regs);
304
305 enum cxl_regloc_type;
306 int cxl_count_regblock(struct pci_dev *pdev, enum cxl_regloc_type type);
307 int cxl_find_regblock_instance(struct pci_dev *pdev, enum cxl_regloc_type type,
308 struct cxl_register_map *map, int index);
309 int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
310 struct cxl_register_map *map);
311 int cxl_setup_regs(struct cxl_register_map *map);
312 struct cxl_dport;
313 resource_size_t cxl_rcd_component_reg_phys(struct device *dev,
314 struct cxl_dport *dport);
315 int cxl_dport_map_rcd_linkcap(struct pci_dev *pdev, struct cxl_dport *dport);
316
317 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
318 #define CXL_TARGET_STRLEN 20
319
320 /*
321 * cxl_decoder flags that define the type of memory / devices this
322 * decoder supports as well as configuration lock status See "CXL 2.0
323 * 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details.
324 * Additionally indicate whether decoder settings were autodetected,
325 * user customized.
326 */
327 #define CXL_DECODER_F_RAM BIT(0)
328 #define CXL_DECODER_F_PMEM BIT(1)
329 #define CXL_DECODER_F_TYPE2 BIT(2)
330 #define CXL_DECODER_F_TYPE3 BIT(3)
331 #define CXL_DECODER_F_LOCK BIT(4)
332 #define CXL_DECODER_F_ENABLE BIT(5)
333 #define CXL_DECODER_F_MASK GENMASK(5, 0)
334
335 enum cxl_decoder_type {
336 CXL_DECODER_DEVMEM = 2,
337 CXL_DECODER_HOSTONLYMEM = 3,
338 };
339
340 /*
341 * Current specification goes up to 8, double that seems a reasonable
342 * software max for the foreseeable future
343 */
344 #define CXL_DECODER_MAX_INTERLEAVE 16
345
346 #define CXL_QOS_CLASS_INVALID -1
347
348 /**
349 * struct cxl_decoder - Common CXL HDM Decoder Attributes
350 * @dev: this decoder's device
351 * @id: kernel device name id
352 * @hpa_range: Host physical address range mapped by this decoder
353 * @interleave_ways: number of cxl_dports in this decode
354 * @interleave_granularity: data stride per dport
355 * @target_type: accelerator vs expander (type2 vs type3) selector
356 * @region: currently assigned region for this decoder
357 * @flags: memory type capabilities and locking
358 * @commit: device/decoder-type specific callback to commit settings to hw
359 * @reset: device/decoder-type specific callback to reset hw settings
360 */
361 struct cxl_decoder {
362 struct device dev;
363 int id;
364 struct range hpa_range;
365 int interleave_ways;
366 int interleave_granularity;
367 enum cxl_decoder_type target_type;
368 struct cxl_region *region;
369 unsigned long flags;
370 int (*commit)(struct cxl_decoder *cxld);
371 void (*reset)(struct cxl_decoder *cxld);
372 };
373
374 /*
375 * CXL_DECODER_DEAD prevents endpoints from being reattached to regions
376 * while cxld_unregister() is running
377 */
378 enum cxl_decoder_mode {
379 CXL_DECODER_NONE,
380 CXL_DECODER_RAM,
381 CXL_DECODER_PMEM,
382 CXL_DECODER_MIXED,
383 CXL_DECODER_DEAD,
384 };
385
cxl_decoder_mode_name(enum cxl_decoder_mode mode)386 static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode)
387 {
388 static const char * const names[] = {
389 [CXL_DECODER_NONE] = "none",
390 [CXL_DECODER_RAM] = "ram",
391 [CXL_DECODER_PMEM] = "pmem",
392 [CXL_DECODER_MIXED] = "mixed",
393 };
394
395 if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED)
396 return names[mode];
397 return "mixed";
398 }
399
400 /*
401 * Track whether this decoder is reserved for region autodiscovery, or
402 * free for userspace provisioning.
403 */
404 enum cxl_decoder_state {
405 CXL_DECODER_STATE_MANUAL,
406 CXL_DECODER_STATE_AUTO,
407 };
408
409 /**
410 * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder
411 * @cxld: base cxl_decoder_object
412 * @dpa_res: actively claimed DPA span of this decoder
413 * @skip: offset into @dpa_res where @cxld.hpa_range maps
414 * @mode: which memory type / access-mode-partition this decoder targets
415 * @state: autodiscovery state
416 * @pos: interleave position in @cxld.region
417 */
418 struct cxl_endpoint_decoder {
419 struct cxl_decoder cxld;
420 struct resource *dpa_res;
421 resource_size_t skip;
422 enum cxl_decoder_mode mode;
423 enum cxl_decoder_state state;
424 int pos;
425 };
426
427 /**
428 * struct cxl_switch_decoder - Switch specific CXL HDM Decoder
429 * @cxld: base cxl_decoder object
430 * @nr_targets: number of elements in @target
431 * @target: active ordered target list in current decoder configuration
432 *
433 * The 'switch' decoder type represents the decoder instances of cxl_port's that
434 * route from the root of a CXL memory decode topology to the endpoints. They
435 * come in two flavors, root-level decoders, statically defined by platform
436 * firmware, and mid-level decoders, where interleave-granularity,
437 * interleave-width, and the target list are mutable.
438 */
439 struct cxl_switch_decoder {
440 struct cxl_decoder cxld;
441 int nr_targets;
442 struct cxl_dport *target[];
443 };
444
445 struct cxl_root_decoder;
446 typedef u64 (*cxl_hpa_to_spa_fn)(struct cxl_root_decoder *cxlrd, u64 hpa);
447
448 /**
449 * struct cxl_root_decoder - Static platform CXL address decoder
450 * @res: host / parent resource for region allocations
451 * @region_id: region id for next region provisioning event
452 * @hpa_to_spa: translate CXL host-physical-address to Platform system-physical-address
453 * @platform_data: platform specific configuration data
454 * @range_lock: sync region autodiscovery by address range
455 * @qos_class: QoS performance class cookie
456 * @cxlsd: base cxl switch decoder
457 */
458 struct cxl_root_decoder {
459 struct resource *res;
460 atomic_t region_id;
461 cxl_hpa_to_spa_fn hpa_to_spa;
462 void *platform_data;
463 struct mutex range_lock;
464 int qos_class;
465 struct cxl_switch_decoder cxlsd;
466 };
467
468 /*
469 * enum cxl_config_state - State machine for region configuration
470 * @CXL_CONFIG_IDLE: Any sysfs attribute can be written freely
471 * @CXL_CONFIG_INTERLEAVE_ACTIVE: region size has been set, no more
472 * changes to interleave_ways or interleave_granularity
473 * @CXL_CONFIG_ACTIVE: All targets have been added the region is now
474 * active
475 * @CXL_CONFIG_RESET_PENDING: see commit_store()
476 * @CXL_CONFIG_COMMIT: Soft-config has been committed to hardware
477 */
478 enum cxl_config_state {
479 CXL_CONFIG_IDLE,
480 CXL_CONFIG_INTERLEAVE_ACTIVE,
481 CXL_CONFIG_ACTIVE,
482 CXL_CONFIG_RESET_PENDING,
483 CXL_CONFIG_COMMIT,
484 };
485
486 /**
487 * struct cxl_region_params - region settings
488 * @state: allow the driver to lockdown further parameter changes
489 * @uuid: unique id for persistent regions
490 * @interleave_ways: number of endpoints in the region
491 * @interleave_granularity: capacity each endpoint contributes to a stripe
492 * @res: allocated iomem capacity for this region
493 * @targets: active ordered targets in current decoder configuration
494 * @nr_targets: number of targets
495 *
496 * State transitions are protected by the cxl_region_rwsem
497 */
498 struct cxl_region_params {
499 enum cxl_config_state state;
500 uuid_t uuid;
501 int interleave_ways;
502 int interleave_granularity;
503 struct resource *res;
504 struct cxl_endpoint_decoder *targets[CXL_DECODER_MAX_INTERLEAVE];
505 int nr_targets;
506 };
507
508 /*
509 * Indicate whether this region has been assembled by autodetection or
510 * userspace assembly. Prevent endpoint decoders outside of automatic
511 * detection from being added to the region.
512 */
513 #define CXL_REGION_F_AUTO 0
514
515 /*
516 * Require that a committed region successfully complete a teardown once
517 * any of its associated decoders have been torn down. This maintains
518 * the commit state for the region since there are committed decoders,
519 * but blocks cxl_region_probe().
520 */
521 #define CXL_REGION_F_NEEDS_RESET 1
522
523 /**
524 * struct cxl_region - CXL region
525 * @dev: This region's device
526 * @id: This region's id. Id is globally unique across all regions
527 * @mode: Endpoint decoder allocation / access mode
528 * @type: Endpoint decoder target type
529 * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown
530 * @cxlr_pmem: (for pmem regions) cached copy of the nvdimm bridge
531 * @flags: Region state flags
532 * @params: active + config params for the region
533 * @coord: QoS access coordinates for the region
534 * @memory_notifier: notifier for setting the access coordinates to node
535 * @adist_notifier: notifier for calculating the abstract distance of node
536 */
537 struct cxl_region {
538 struct device dev;
539 int id;
540 enum cxl_decoder_mode mode;
541 enum cxl_decoder_type type;
542 struct cxl_nvdimm_bridge *cxl_nvb;
543 struct cxl_pmem_region *cxlr_pmem;
544 unsigned long flags;
545 struct cxl_region_params params;
546 struct access_coordinate coord[ACCESS_COORDINATE_MAX];
547 struct notifier_block memory_notifier;
548 struct notifier_block adist_notifier;
549 };
550
551 struct cxl_nvdimm_bridge {
552 int id;
553 struct device dev;
554 struct cxl_port *port;
555 struct nvdimm_bus *nvdimm_bus;
556 struct nvdimm_bus_descriptor nd_desc;
557 };
558
559 #define CXL_DEV_ID_LEN 19
560
561 struct cxl_nvdimm {
562 struct device dev;
563 struct cxl_memdev *cxlmd;
564 u8 dev_id[CXL_DEV_ID_LEN]; /* for nvdimm, string of 'serial' */
565 };
566
567 struct cxl_pmem_region_mapping {
568 struct cxl_memdev *cxlmd;
569 struct cxl_nvdimm *cxl_nvd;
570 u64 start;
571 u64 size;
572 int position;
573 };
574
575 struct cxl_pmem_region {
576 struct device dev;
577 struct cxl_region *cxlr;
578 struct nd_region *nd_region;
579 struct range hpa_range;
580 int nr_mappings;
581 struct cxl_pmem_region_mapping mapping[];
582 };
583
584 struct cxl_dax_region {
585 struct device dev;
586 struct cxl_region *cxlr;
587 struct range hpa_range;
588 };
589
590 /**
591 * struct cxl_port - logical collection of upstream port devices and
592 * downstream port devices to construct a CXL memory
593 * decode hierarchy.
594 * @dev: this port's device
595 * @uport_dev: PCI or platform device implementing the upstream port capability
596 * @host_bridge: Shortcut to the platform attach point for this port
597 * @id: id for port device-name
598 * @dports: cxl_dport instances referenced by decoders
599 * @endpoints: cxl_ep instances, endpoints that are a descendant of this port
600 * @regions: cxl_region_ref instances, regions mapped by this port
601 * @parent_dport: dport that points to this port in the parent
602 * @decoder_ida: allocator for decoder ids
603 * @reg_map: component and ras register mapping parameters
604 * @nr_dports: number of entries in @dports
605 * @hdm_end: track last allocated HDM decoder instance for allocation ordering
606 * @commit_end: cursor to track highest committed decoder for commit ordering
607 * @dead: last ep has been removed, force port re-creation
608 * @depth: How deep this port is relative to the root. depth 0 is the root.
609 * @cdat: Cached CDAT data
610 * @cdat_available: Should a CDAT attribute be available in sysfs
611 * @pci_latency: Upstream latency in picoseconds
612 */
613 struct cxl_port {
614 struct device dev;
615 struct device *uport_dev;
616 struct device *host_bridge;
617 int id;
618 struct xarray dports;
619 struct xarray endpoints;
620 struct xarray regions;
621 struct cxl_dport *parent_dport;
622 struct ida decoder_ida;
623 struct cxl_register_map reg_map;
624 int nr_dports;
625 int hdm_end;
626 int commit_end;
627 bool dead;
628 unsigned int depth;
629 struct cxl_cdat {
630 void *table;
631 size_t length;
632 } cdat;
633 bool cdat_available;
634 long pci_latency;
635 };
636
637 /**
638 * struct cxl_root - logical collection of root cxl_port items
639 *
640 * @port: cxl_port member
641 * @ops: cxl root operations
642 */
643 struct cxl_root {
644 struct cxl_port port;
645 const struct cxl_root_ops *ops;
646 };
647
648 static inline struct cxl_root *
to_cxl_root(const struct cxl_port * port)649 to_cxl_root(const struct cxl_port *port)
650 {
651 return container_of(port, struct cxl_root, port);
652 }
653
654 struct cxl_root_ops {
655 int (*qos_class)(struct cxl_root *cxl_root,
656 struct access_coordinate *coord, int entries,
657 int *qos_class);
658 };
659
660 static inline struct cxl_dport *
cxl_find_dport_by_dev(struct cxl_port * port,const struct device * dport_dev)661 cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev)
662 {
663 return xa_load(&port->dports, (unsigned long)dport_dev);
664 }
665
666 struct cxl_rcrb_info {
667 resource_size_t base;
668 u16 aer_cap;
669 };
670
671 /**
672 * struct cxl_dport - CXL downstream port
673 * @dport_dev: PCI bridge or firmware device representing the downstream link
674 * @reg_map: component and ras register mapping parameters
675 * @port_id: unique hardware identifier for dport in decoder target list
676 * @rcrb: Data about the Root Complex Register Block layout
677 * @rch: Indicate whether this dport was enumerated in RCH or VH mode
678 * @port: reference to cxl_port that contains this downstream port
679 * @regs: Dport parsed register blocks
680 * @coord: access coordinates (bandwidth and latency performance attributes)
681 * @link_latency: calculated PCIe downstream latency
682 */
683 struct cxl_dport {
684 struct device *dport_dev;
685 struct cxl_register_map reg_map;
686 int port_id;
687 struct cxl_rcrb_info rcrb;
688 bool rch;
689 struct cxl_port *port;
690 struct cxl_regs regs;
691 struct access_coordinate coord[ACCESS_COORDINATE_MAX];
692 long link_latency;
693 };
694
695 /**
696 * struct cxl_ep - track an endpoint's interest in a port
697 * @ep: device that hosts a generic CXL endpoint (expander or accelerator)
698 * @dport: which dport routes to this endpoint on @port
699 * @next: cxl switch port across the link attached to @dport NULL if
700 * attached to an endpoint
701 */
702 struct cxl_ep {
703 struct device *ep;
704 struct cxl_dport *dport;
705 struct cxl_port *next;
706 };
707
708 /**
709 * struct cxl_region_ref - track a region's interest in a port
710 * @port: point in topology to install this reference
711 * @decoder: decoder assigned for @region in @port
712 * @region: region for this reference
713 * @endpoints: cxl_ep references for region members beneath @port
714 * @nr_targets_set: track how many targets have been programmed during setup
715 * @nr_eps: number of endpoints beneath @port
716 * @nr_targets: number of distinct targets needed to reach @nr_eps
717 */
718 struct cxl_region_ref {
719 struct cxl_port *port;
720 struct cxl_decoder *decoder;
721 struct cxl_region *region;
722 struct xarray endpoints;
723 int nr_targets_set;
724 int nr_eps;
725 int nr_targets;
726 };
727
728 /*
729 * The platform firmware device hosting the root is also the top of the
730 * CXL port topology. All other CXL ports have another CXL port as their
731 * parent and their ->uport_dev / host device is out-of-line of the port
732 * ancestry.
733 */
is_cxl_root(struct cxl_port * port)734 static inline bool is_cxl_root(struct cxl_port *port)
735 {
736 return port->uport_dev == port->dev.parent;
737 }
738
739 int cxl_num_decoders_committed(struct cxl_port *port);
740 bool is_cxl_port(const struct device *dev);
741 struct cxl_port *to_cxl_port(const struct device *dev);
742 void cxl_port_commit_reap(struct cxl_decoder *cxld);
743 struct pci_bus;
744 int devm_cxl_register_pci_bus(struct device *host, struct device *uport_dev,
745 struct pci_bus *bus);
746 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port);
747 struct cxl_port *devm_cxl_add_port(struct device *host,
748 struct device *uport_dev,
749 resource_size_t component_reg_phys,
750 struct cxl_dport *parent_dport);
751 struct cxl_root *devm_cxl_add_root(struct device *host,
752 const struct cxl_root_ops *ops);
753 struct cxl_root *find_cxl_root(struct cxl_port *port);
754 void put_cxl_root(struct cxl_root *cxl_root);
755 DEFINE_FREE(put_cxl_root, struct cxl_root *, if (_T) put_cxl_root(_T))
756
757 DEFINE_FREE(put_cxl_port, struct cxl_port *, if (!IS_ERR_OR_NULL(_T)) put_device(&_T->dev))
758 int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd);
759 void cxl_bus_rescan(void);
760 void cxl_bus_drain(void);
761 struct cxl_port *cxl_pci_find_port(struct pci_dev *pdev,
762 struct cxl_dport **dport);
763 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd,
764 struct cxl_dport **dport);
765 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd);
766
767 struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
768 struct device *dport, int port_id,
769 resource_size_t component_reg_phys);
770 struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
771 struct device *dport_dev, int port_id,
772 resource_size_t rcrb);
773
774 #ifdef CONFIG_PCIEAER_CXL
775 void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport);
776 void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host);
777 #else
cxl_dport_init_ras_reporting(struct cxl_dport * dport,struct device * host)778 static inline void cxl_dport_init_ras_reporting(struct cxl_dport *dport,
779 struct device *host) { }
780 #endif
781
782 struct cxl_decoder *to_cxl_decoder(struct device *dev);
783 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev);
784 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev);
785 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev);
786 bool is_root_decoder(struct device *dev);
787 bool is_switch_decoder(struct device *dev);
788 bool is_endpoint_decoder(struct device *dev);
789 struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
790 unsigned int nr_targets);
791 struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port,
792 unsigned int nr_targets);
793 int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map);
794 struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port);
795 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map);
796 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld);
cxl_root_decoder_autoremove(struct device * host,struct cxl_root_decoder * cxlrd)797 static inline int cxl_root_decoder_autoremove(struct device *host,
798 struct cxl_root_decoder *cxlrd)
799 {
800 return cxl_decoder_autoremove(host, &cxlrd->cxlsd.cxld);
801 }
802 int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint);
803
804 /**
805 * struct cxl_endpoint_dvsec_info - Cached DVSEC info
806 * @mem_enabled: cached value of mem_enabled in the DVSEC at init time
807 * @ranges: Number of active HDM ranges this device uses.
808 * @port: endpoint port associated with this info instance
809 * @dvsec_range: cached attributes of the ranges in the DVSEC, PCIE_DEVICE
810 */
811 struct cxl_endpoint_dvsec_info {
812 bool mem_enabled;
813 int ranges;
814 struct cxl_port *port;
815 struct range dvsec_range[2];
816 };
817
818 struct cxl_hdm;
819 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
820 struct cxl_endpoint_dvsec_info *info);
821 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
822 struct cxl_endpoint_dvsec_info *info);
823 int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
824 int cxl_dvsec_rr_decode(struct device *dev, struct cxl_port *port,
825 struct cxl_endpoint_dvsec_info *info);
826
827 bool is_cxl_region(struct device *dev);
828
829 extern struct bus_type cxl_bus_type;
830
831 struct cxl_driver {
832 const char *name;
833 int (*probe)(struct device *dev);
834 void (*remove)(struct device *dev);
835 struct device_driver drv;
836 int id;
837 };
838
839 #define to_cxl_drv(__drv) container_of_const(__drv, struct cxl_driver, drv)
840
841 int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
842 const char *modname);
843 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
844 void cxl_driver_unregister(struct cxl_driver *cxl_drv);
845
846 #define module_cxl_driver(__cxl_driver) \
847 module_driver(__cxl_driver, cxl_driver_register, cxl_driver_unregister)
848
849 #define CXL_DEVICE_NVDIMM_BRIDGE 1
850 #define CXL_DEVICE_NVDIMM 2
851 #define CXL_DEVICE_PORT 3
852 #define CXL_DEVICE_ROOT 4
853 #define CXL_DEVICE_MEMORY_EXPANDER 5
854 #define CXL_DEVICE_REGION 6
855 #define CXL_DEVICE_PMEM_REGION 7
856 #define CXL_DEVICE_DAX_REGION 8
857 #define CXL_DEVICE_PMU 9
858
859 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
860 #define CXL_MODALIAS_FMT "cxl:t%d"
861
862 struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev);
863 struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
864 struct cxl_port *port);
865 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev);
866 bool is_cxl_nvdimm(struct device *dev);
867 bool is_cxl_nvdimm_bridge(struct device *dev);
868 int devm_cxl_add_nvdimm(struct cxl_port *parent_port, struct cxl_memdev *cxlmd);
869 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_port *port);
870
871 #ifdef CONFIG_CXL_REGION
872 bool is_cxl_pmem_region(struct device *dev);
873 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev);
874 int cxl_add_to_region(struct cxl_port *root,
875 struct cxl_endpoint_decoder *cxled);
876 struct cxl_dax_region *to_cxl_dax_region(struct device *dev);
877 #else
is_cxl_pmem_region(struct device * dev)878 static inline bool is_cxl_pmem_region(struct device *dev)
879 {
880 return false;
881 }
to_cxl_pmem_region(struct device * dev)882 static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev)
883 {
884 return NULL;
885 }
cxl_add_to_region(struct cxl_port * root,struct cxl_endpoint_decoder * cxled)886 static inline int cxl_add_to_region(struct cxl_port *root,
887 struct cxl_endpoint_decoder *cxled)
888 {
889 return 0;
890 }
to_cxl_dax_region(struct device * dev)891 static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev)
892 {
893 return NULL;
894 }
895 #endif
896
897 void cxl_endpoint_parse_cdat(struct cxl_port *port);
898 void cxl_switch_parse_cdat(struct cxl_port *port);
899
900 int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
901 struct access_coordinate *coord);
902 void cxl_region_perf_data_calculate(struct cxl_region *cxlr,
903 struct cxl_endpoint_decoder *cxled);
904 void cxl_region_shared_upstream_bandwidth_update(struct cxl_region *cxlr);
905
906 void cxl_memdev_update_perf(struct cxl_memdev *cxlmd);
907
908 void cxl_coordinates_combine(struct access_coordinate *out,
909 struct access_coordinate *c1,
910 struct access_coordinate *c2);
911
912 bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port);
913
914 /*
915 * Unit test builds overrides this to __weak, find the 'strong' version
916 * of these symbols in tools/testing/cxl/.
917 */
918 #ifndef __mock
919 #define __mock static
920 #endif
921
922 #endif /* __CXL_H__ */
923