xref: /linux/drivers/cxl/cxl.h (revision b1966a1fd218e1f5d5376bf352f9a4c26aba50b5)
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 	void (*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 void cxl_port_commit_reap(struct cxl_decoder *cxld);
734 struct pci_bus;
735 int devm_cxl_register_pci_bus(struct device *host, struct device *uport_dev,
736 			      struct pci_bus *bus);
737 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port);
738 struct cxl_port *devm_cxl_add_port(struct device *host,
739 				   struct device *uport_dev,
740 				   resource_size_t component_reg_phys,
741 				   struct cxl_dport *parent_dport);
742 struct cxl_root *devm_cxl_add_root(struct device *host,
743 				   const struct cxl_root_ops *ops);
744 struct cxl_root *find_cxl_root(struct cxl_port *port);
745 void put_cxl_root(struct cxl_root *cxl_root);
746 DEFINE_FREE(put_cxl_root, struct cxl_root *, if (_T) put_cxl_root(_T))
747 
748 DEFINE_FREE(put_cxl_port, struct cxl_port *, if (!IS_ERR_OR_NULL(_T)) put_device(&_T->dev))
749 int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd);
750 void cxl_bus_rescan(void);
751 void cxl_bus_drain(void);
752 struct cxl_port *cxl_pci_find_port(struct pci_dev *pdev,
753 				   struct cxl_dport **dport);
754 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd,
755 				   struct cxl_dport **dport);
756 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd);
757 
758 struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
759 				     struct device *dport, int port_id,
760 				     resource_size_t component_reg_phys);
761 struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
762 					 struct device *dport_dev, int port_id,
763 					 resource_size_t rcrb);
764 
765 #ifdef CONFIG_PCIEAER_CXL
766 void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport);
767 void cxl_dport_init_ras_reporting(struct cxl_dport *dport, struct device *host);
768 #else
cxl_dport_init_ras_reporting(struct cxl_dport * dport,struct device * host)769 static inline void cxl_dport_init_ras_reporting(struct cxl_dport *dport,
770 						struct device *host) { }
771 #endif
772 
773 struct cxl_decoder *to_cxl_decoder(struct device *dev);
774 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev);
775 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev);
776 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev);
777 bool is_root_decoder(struct device *dev);
778 bool is_switch_decoder(struct device *dev);
779 bool is_endpoint_decoder(struct device *dev);
780 struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
781 						unsigned int nr_targets);
782 struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port,
783 						    unsigned int nr_targets);
784 int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map);
785 struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port);
786 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map);
787 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld);
cxl_root_decoder_autoremove(struct device * host,struct cxl_root_decoder * cxlrd)788 static inline int cxl_root_decoder_autoremove(struct device *host,
789 					      struct cxl_root_decoder *cxlrd)
790 {
791 	return cxl_decoder_autoremove(host, &cxlrd->cxlsd.cxld);
792 }
793 int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint);
794 
795 /**
796  * struct cxl_endpoint_dvsec_info - Cached DVSEC info
797  * @mem_enabled: cached value of mem_enabled in the DVSEC at init time
798  * @ranges: Number of active HDM ranges this device uses.
799  * @port: endpoint port associated with this info instance
800  * @dvsec_range: cached attributes of the ranges in the DVSEC, PCIE_DEVICE
801  */
802 struct cxl_endpoint_dvsec_info {
803 	bool mem_enabled;
804 	int ranges;
805 	struct cxl_port *port;
806 	struct range dvsec_range[2];
807 };
808 
809 struct cxl_hdm;
810 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port,
811 				   struct cxl_endpoint_dvsec_info *info);
812 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
813 				struct cxl_endpoint_dvsec_info *info);
814 int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
815 int cxl_dvsec_rr_decode(struct device *dev, struct cxl_port *port,
816 			struct cxl_endpoint_dvsec_info *info);
817 
818 bool is_cxl_region(struct device *dev);
819 
820 extern struct bus_type cxl_bus_type;
821 
822 struct cxl_driver {
823 	const char *name;
824 	int (*probe)(struct device *dev);
825 	void (*remove)(struct device *dev);
826 	struct device_driver drv;
827 	int id;
828 };
829 
830 #define to_cxl_drv(__drv)	container_of_const(__drv, struct cxl_driver, drv)
831 
832 int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
833 			  const char *modname);
834 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
835 void cxl_driver_unregister(struct cxl_driver *cxl_drv);
836 
837 #define module_cxl_driver(__cxl_driver) \
838 	module_driver(__cxl_driver, cxl_driver_register, cxl_driver_unregister)
839 
840 #define CXL_DEVICE_NVDIMM_BRIDGE	1
841 #define CXL_DEVICE_NVDIMM		2
842 #define CXL_DEVICE_PORT			3
843 #define CXL_DEVICE_ROOT			4
844 #define CXL_DEVICE_MEMORY_EXPANDER	5
845 #define CXL_DEVICE_REGION		6
846 #define CXL_DEVICE_PMEM_REGION		7
847 #define CXL_DEVICE_DAX_REGION		8
848 #define CXL_DEVICE_PMU			9
849 
850 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
851 #define CXL_MODALIAS_FMT "cxl:t%d"
852 
853 struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev);
854 struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
855 						     struct cxl_port *port);
856 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev);
857 bool is_cxl_nvdimm(struct device *dev);
858 bool is_cxl_nvdimm_bridge(struct device *dev);
859 int devm_cxl_add_nvdimm(struct cxl_port *parent_port, struct cxl_memdev *cxlmd);
860 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_port *port);
861 
862 #ifdef CONFIG_CXL_REGION
863 bool is_cxl_pmem_region(struct device *dev);
864 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev);
865 int cxl_add_to_region(struct cxl_port *root,
866 		      struct cxl_endpoint_decoder *cxled);
867 struct cxl_dax_region *to_cxl_dax_region(struct device *dev);
868 #else
is_cxl_pmem_region(struct device * dev)869 static inline bool is_cxl_pmem_region(struct device *dev)
870 {
871 	return false;
872 }
to_cxl_pmem_region(struct device * dev)873 static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev)
874 {
875 	return NULL;
876 }
cxl_add_to_region(struct cxl_port * root,struct cxl_endpoint_decoder * cxled)877 static inline int cxl_add_to_region(struct cxl_port *root,
878 				    struct cxl_endpoint_decoder *cxled)
879 {
880 	return 0;
881 }
to_cxl_dax_region(struct device * dev)882 static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev)
883 {
884 	return NULL;
885 }
886 #endif
887 
888 void cxl_endpoint_parse_cdat(struct cxl_port *port);
889 void cxl_switch_parse_cdat(struct cxl_port *port);
890 
891 int cxl_endpoint_get_perf_coordinates(struct cxl_port *port,
892 				      struct access_coordinate *coord);
893 void cxl_region_perf_data_calculate(struct cxl_region *cxlr,
894 				    struct cxl_endpoint_decoder *cxled);
895 void cxl_region_shared_upstream_bandwidth_update(struct cxl_region *cxlr);
896 
897 void cxl_memdev_update_perf(struct cxl_memdev *cxlmd);
898 
899 void cxl_coordinates_combine(struct access_coordinate *out,
900 			     struct access_coordinate *c1,
901 			     struct access_coordinate *c2);
902 
903 bool cxl_endpoint_decoder_reset_detected(struct cxl_port *port);
904 
905 /*
906  * Unit test builds overrides this to __weak, find the 'strong' version
907  * of these symbols in tools/testing/cxl/.
908  */
909 #ifndef __mock
910 #define __mock static
911 #endif
912 
913 #endif /* __CXL_H__ */
914