1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright(c) 2020 Intel Corporation. */
7 #include <linux/libnvdimm.h>
8 #include <linux/bitfield.h>
9 #include <linux/bitops.h>
10 #include <linux/log2.h>
16 * The CXL core objects like ports, decoders, and regions are shared
17 * between the subsystem drivers cxl_acpi, cxl_pci, and core drivers
18 * (port-driver, region-driver, nvdimm object-drivers... etc).
21 /* CXL 2.0 8.2.4 CXL Component Register Layout and Definition */
22 #define CXL_COMPONENT_REG_BLOCK_SIZE SZ_64K
24 /* CXL 2.0 8.2.5 CXL.cache and CXL.mem Registers*/
25 #define CXL_CM_OFFSET 0x1000
26 #define CXL_CM_CAP_HDR_OFFSET 0x0
27 #define CXL_CM_CAP_HDR_ID_MASK GENMASK(15, 0)
28 #define CM_CAP_HDR_CAP_ID 1
29 #define CXL_CM_CAP_HDR_VERSION_MASK GENMASK(19, 16)
30 #define CM_CAP_HDR_CAP_VERSION 1
31 #define CXL_CM_CAP_HDR_CACHE_MEM_VERSION_MASK GENMASK(23, 20)
32 #define CM_CAP_HDR_CACHE_MEM_VERSION 1
33 #define CXL_CM_CAP_HDR_ARRAY_SIZE_MASK GENMASK(31, 24)
34 #define CXL_CM_CAP_PTR_MASK GENMASK(31, 20)
36 #define CXL_CM_CAP_CAP_ID_RAS 0x2
37 #define CXL_CM_CAP_CAP_ID_HDM 0x5
38 #define CXL_CM_CAP_CAP_HDM_VERSION 1
40 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */
41 #define CXL_HDM_DECODER_CAP_OFFSET 0x0
42 #define CXL_HDM_DECODER_COUNT_MASK GENMASK(3, 0)
43 #define CXL_HDM_DECODER_TARGET_COUNT_MASK GENMASK(7, 4)
44 #define CXL_HDM_DECODER_INTERLEAVE_11_8 BIT(8)
45 #define CXL_HDM_DECODER_INTERLEAVE_14_12 BIT(9)
46 #define CXL_HDM_DECODER_CTRL_OFFSET 0x4
47 #define CXL_HDM_DECODER_ENABLE BIT(1)
48 #define CXL_HDM_DECODER0_BASE_LOW_OFFSET(i) (0x20 * (i) + 0x10)
49 #define CXL_HDM_DECODER0_BASE_HIGH_OFFSET(i) (0x20 * (i) + 0x14)
50 #define CXL_HDM_DECODER0_SIZE_LOW_OFFSET(i) (0x20 * (i) + 0x18)
51 #define CXL_HDM_DECODER0_SIZE_HIGH_OFFSET(i) (0x20 * (i) + 0x1c)
52 #define CXL_HDM_DECODER0_CTRL_OFFSET(i) (0x20 * (i) + 0x20)
53 #define CXL_HDM_DECODER0_CTRL_IG_MASK GENMASK(3, 0)
54 #define CXL_HDM_DECODER0_CTRL_IW_MASK GENMASK(7, 4)
55 #define CXL_HDM_DECODER0_CTRL_LOCK BIT(8)
56 #define CXL_HDM_DECODER0_CTRL_COMMIT BIT(9)
57 #define CXL_HDM_DECODER0_CTRL_COMMITTED BIT(10)
58 #define CXL_HDM_DECODER0_CTRL_COMMIT_ERROR BIT(11)
59 #define CXL_HDM_DECODER0_CTRL_TYPE BIT(12)
60 #define CXL_HDM_DECODER0_TL_LOW(i) (0x20 * (i) + 0x24)
61 #define CXL_HDM_DECODER0_TL_HIGH(i) (0x20 * (i) + 0x28)
62 #define CXL_HDM_DECODER0_SKIP_LOW(i) CXL_HDM_DECODER0_TL_LOW(i)
63 #define CXL_HDM_DECODER0_SKIP_HIGH(i) CXL_HDM_DECODER0_TL_HIGH(i)
65 /* HDM decoder control register constants CXL 3.0 8.2.5.19.7 */
66 #define CXL_DECODER_MIN_GRANULARITY 256
67 #define CXL_DECODER_MAX_ENCODED_IG 6
69 static inline int cxl_hdm_decoder_count(u32 cap_hdr)
71 int val = FIELD_GET(CXL_HDM_DECODER_COUNT_MASK, cap_hdr);
73 return val ? val * 2 : 1;
76 /* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */
77 static inline int eig_to_granularity(u16 eig, unsigned int *granularity)
79 if (eig > CXL_DECODER_MAX_ENCODED_IG)
81 *granularity = CXL_DECODER_MIN_GRANULARITY << eig;
85 /* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */
86 static inline int eiw_to_ways(u8 eiw, unsigned int *ways)
93 *ways = 3 << (eiw - 8);
102 static inline int granularity_to_eig(int granularity, u16 *eig)
104 if (granularity > SZ_16K || granularity < CXL_DECODER_MIN_GRANULARITY ||
105 !is_power_of_2(granularity))
107 *eig = ilog2(granularity) - 8;
111 static inline int ways_to_eiw(unsigned int ways, u8 *eiw)
115 if (is_power_of_2(ways)) {
122 if (!is_power_of_2(ways))
124 *eiw = ilog2(ways) + 8;
128 /* RAS Registers CXL 2.0 8.2.5.9 CXL RAS Capability Structure */
129 #define CXL_RAS_UNCORRECTABLE_STATUS_OFFSET 0x0
130 #define CXL_RAS_UNCORRECTABLE_STATUS_MASK (GENMASK(16, 14) | GENMASK(11, 0))
131 #define CXL_RAS_UNCORRECTABLE_MASK_OFFSET 0x4
132 #define CXL_RAS_UNCORRECTABLE_MASK_MASK (GENMASK(16, 14) | GENMASK(11, 0))
133 #define CXL_RAS_UNCORRECTABLE_SEVERITY_OFFSET 0x8
134 #define CXL_RAS_UNCORRECTABLE_SEVERITY_MASK (GENMASK(16, 14) | GENMASK(11, 0))
135 #define CXL_RAS_CORRECTABLE_STATUS_OFFSET 0xC
136 #define CXL_RAS_CORRECTABLE_STATUS_MASK GENMASK(6, 0)
137 #define CXL_RAS_CORRECTABLE_MASK_OFFSET 0x10
138 #define CXL_RAS_CORRECTABLE_MASK_MASK GENMASK(6, 0)
139 #define CXL_RAS_CAP_CONTROL_OFFSET 0x14
140 #define CXL_RAS_CAP_CONTROL_FE_MASK GENMASK(5, 0)
141 #define CXL_RAS_HEADER_LOG_OFFSET 0x18
142 #define CXL_RAS_CAPABILITY_LENGTH 0x58
143 #define CXL_HEADERLOG_SIZE SZ_512
144 #define CXL_HEADERLOG_SIZE_U32 SZ_512 / sizeof(u32)
146 /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */
147 #define CXLDEV_CAP_ARRAY_OFFSET 0x0
148 #define CXLDEV_CAP_ARRAY_CAP_ID 0
149 #define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0)
150 #define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32)
151 /* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */
152 #define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0)
153 /* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */
154 #define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1
155 #define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2
156 #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3
157 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000
159 /* CXL 2.0 8.2.8.4 Mailbox Registers */
160 #define CXLDEV_MBOX_CAPS_OFFSET 0x00
161 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0)
162 #define CXLDEV_MBOX_CTRL_OFFSET 0x04
163 #define CXLDEV_MBOX_CTRL_DOORBELL BIT(0)
164 #define CXLDEV_MBOX_CMD_OFFSET 0x08
165 #define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0)
166 #define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16)
167 #define CXLDEV_MBOX_STATUS_OFFSET 0x10
168 #define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32)
169 #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18
170 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20
173 * Using struct_group() allows for per register-block-type helper routines,
174 * without requiring block-type agnostic code to include the prefix.
178 * Common set of CXL Component register block base pointers
179 * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
180 * @ras: CXL 2.0 8.2.5.9 CXL RAS Capability Structure
182 struct_group_tagged(cxl_component_regs, component,
183 void __iomem *hdm_decoder;
187 * Common set of CXL Device register block base pointers
188 * @status: CXL 2.0 8.2.8.3 Device Status Registers
189 * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
190 * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
192 struct_group_tagged(cxl_device_regs, device_regs,
193 void __iomem *status, *mbox, *memdev;
200 unsigned long offset;
204 struct cxl_component_reg_map {
205 struct cxl_reg_map hdm_decoder;
206 struct cxl_reg_map ras;
209 struct cxl_device_reg_map {
210 struct cxl_reg_map status;
211 struct cxl_reg_map mbox;
212 struct cxl_reg_map memdev;
216 * struct cxl_register_map - DVSEC harvested register block mapping parameters
217 * @base: virtual base of the register-block-BAR + @block_offset
218 * @resource: physical resource base of the register block
219 * @max_size: maximum mapping size to perform register search
220 * @reg_type: see enum cxl_regloc_type
221 * @component_map: cxl_reg_map for component registers
222 * @device_map: cxl_reg_maps for device registers
224 struct cxl_register_map {
226 resource_size_t resource;
227 resource_size_t max_size;
230 struct cxl_component_reg_map component_map;
231 struct cxl_device_reg_map device_map;
235 void cxl_probe_component_regs(struct device *dev, void __iomem *base,
236 struct cxl_component_reg_map *map);
237 void cxl_probe_device_regs(struct device *dev, void __iomem *base,
238 struct cxl_device_reg_map *map);
239 int cxl_map_component_regs(struct device *dev, struct cxl_component_regs *regs,
240 struct cxl_register_map *map,
241 unsigned long map_mask);
242 int cxl_map_device_regs(struct device *dev, struct cxl_device_regs *regs,
243 struct cxl_register_map *map);
245 enum cxl_regloc_type;
246 int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type,
247 struct cxl_register_map *map);
253 resource_size_t cxl_rcrb_to_component(struct device *dev,
254 resource_size_t rcrb,
255 enum cxl_rcrb which);
257 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
258 #define CXL_TARGET_STRLEN 20
261 * cxl_decoder flags that define the type of memory / devices this
262 * decoder supports as well as configuration lock status See "CXL 2.0
263 * 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details.
264 * Additionally indicate whether decoder settings were autodetected,
267 #define CXL_DECODER_F_RAM BIT(0)
268 #define CXL_DECODER_F_PMEM BIT(1)
269 #define CXL_DECODER_F_TYPE2 BIT(2)
270 #define CXL_DECODER_F_TYPE3 BIT(3)
271 #define CXL_DECODER_F_LOCK BIT(4)
272 #define CXL_DECODER_F_ENABLE BIT(5)
273 #define CXL_DECODER_F_MASK GENMASK(5, 0)
275 enum cxl_decoder_type {
276 CXL_DECODER_ACCELERATOR = 2,
277 CXL_DECODER_EXPANDER = 3,
281 * Current specification goes up to 8, double that seems a reasonable
282 * software max for the foreseeable future
284 #define CXL_DECODER_MAX_INTERLEAVE 16
288 * struct cxl_decoder - Common CXL HDM Decoder Attributes
289 * @dev: this decoder's device
290 * @id: kernel device name id
291 * @hpa_range: Host physical address range mapped by this decoder
292 * @interleave_ways: number of cxl_dports in this decode
293 * @interleave_granularity: data stride per dport
294 * @target_type: accelerator vs expander (type2 vs type3) selector
295 * @region: currently assigned region for this decoder
296 * @flags: memory type capabilities and locking
297 * @commit: device/decoder-type specific callback to commit settings to hw
298 * @reset: device/decoder-type specific callback to reset hw settings
303 struct range hpa_range;
305 int interleave_granularity;
306 enum cxl_decoder_type target_type;
307 struct cxl_region *region;
309 int (*commit)(struct cxl_decoder *cxld);
310 int (*reset)(struct cxl_decoder *cxld);
314 * CXL_DECODER_DEAD prevents endpoints from being reattached to regions
315 * while cxld_unregister() is running
317 enum cxl_decoder_mode {
325 static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode)
327 static const char * const names[] = {
328 [CXL_DECODER_NONE] = "none",
329 [CXL_DECODER_RAM] = "ram",
330 [CXL_DECODER_PMEM] = "pmem",
331 [CXL_DECODER_MIXED] = "mixed",
334 if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED)
340 * Track whether this decoder is reserved for region autodiscovery, or
341 * free for userspace provisioning.
343 enum cxl_decoder_state {
344 CXL_DECODER_STATE_MANUAL,
345 CXL_DECODER_STATE_AUTO,
349 * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder
350 * @cxld: base cxl_decoder_object
351 * @dpa_res: actively claimed DPA span of this decoder
352 * @skip: offset into @dpa_res where @cxld.hpa_range maps
353 * @mode: which memory type / access-mode-partition this decoder targets
354 * @state: autodiscovery state
355 * @pos: interleave position in @cxld.region
357 struct cxl_endpoint_decoder {
358 struct cxl_decoder cxld;
359 struct resource *dpa_res;
360 resource_size_t skip;
361 enum cxl_decoder_mode mode;
362 enum cxl_decoder_state state;
367 * struct cxl_switch_decoder - Switch specific CXL HDM Decoder
368 * @cxld: base cxl_decoder object
369 * @target_lock: coordinate coherent reads of the target list
370 * @nr_targets: number of elements in @target
371 * @target: active ordered target list in current decoder configuration
373 * The 'switch' decoder type represents the decoder instances of cxl_port's that
374 * route from the root of a CXL memory decode topology to the endpoints. They
375 * come in two flavors, root-level decoders, statically defined by platform
376 * firmware, and mid-level decoders, where interleave-granularity,
377 * interleave-width, and the target list are mutable.
379 struct cxl_switch_decoder {
380 struct cxl_decoder cxld;
381 seqlock_t target_lock;
383 struct cxl_dport *target[];
386 struct cxl_root_decoder;
387 typedef struct cxl_dport *(*cxl_calc_hb_fn)(struct cxl_root_decoder *cxlrd,
391 * struct cxl_root_decoder - Static platform CXL address decoder
392 * @res: host / parent resource for region allocations
393 * @region_id: region id for next region provisioning event
394 * @calc_hb: which host bridge covers the n'th position by granularity
395 * @platform_data: platform specific configuration data
396 * @range_lock: sync region autodiscovery by address range
397 * @cxlsd: base cxl switch decoder
399 struct cxl_root_decoder {
400 struct resource *res;
402 cxl_calc_hb_fn calc_hb;
404 struct mutex range_lock;
405 struct cxl_switch_decoder cxlsd;
409 * enum cxl_config_state - State machine for region configuration
410 * @CXL_CONFIG_IDLE: Any sysfs attribute can be written freely
411 * @CXL_CONFIG_INTERLEAVE_ACTIVE: region size has been set, no more
412 * changes to interleave_ways or interleave_granularity
413 * @CXL_CONFIG_ACTIVE: All targets have been added the region is now
415 * @CXL_CONFIG_RESET_PENDING: see commit_store()
416 * @CXL_CONFIG_COMMIT: Soft-config has been committed to hardware
418 enum cxl_config_state {
420 CXL_CONFIG_INTERLEAVE_ACTIVE,
422 CXL_CONFIG_RESET_PENDING,
427 * struct cxl_region_params - region settings
428 * @state: allow the driver to lockdown further parameter changes
429 * @uuid: unique id for persistent regions
430 * @interleave_ways: number of endpoints in the region
431 * @interleave_granularity: capacity each endpoint contributes to a stripe
432 * @res: allocated iomem capacity for this region
433 * @targets: active ordered targets in current decoder configuration
434 * @nr_targets: number of targets
436 * State transitions are protected by the cxl_region_rwsem
438 struct cxl_region_params {
439 enum cxl_config_state state;
442 int interleave_granularity;
443 struct resource *res;
444 struct cxl_endpoint_decoder *targets[CXL_DECODER_MAX_INTERLEAVE];
449 * Flag whether this region needs to have its HPA span synchronized with
450 * CPU cache state at region activation time.
452 #define CXL_REGION_F_INCOHERENT 0
455 * Indicate whether this region has been assembled by autodetection or
456 * userspace assembly. Prevent endpoint decoders outside of automatic
457 * detection from being added to the region.
459 #define CXL_REGION_F_AUTO 1
462 * struct cxl_region - CXL region
463 * @dev: This region's device
464 * @id: This region's id. Id is globally unique across all regions
465 * @mode: Endpoint decoder allocation / access mode
466 * @type: Endpoint decoder target type
467 * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown
468 * @cxlr_pmem: (for pmem regions) cached copy of the nvdimm bridge
469 * @flags: Region state flags
470 * @params: active + config params for the region
475 enum cxl_decoder_mode mode;
476 enum cxl_decoder_type type;
477 struct cxl_nvdimm_bridge *cxl_nvb;
478 struct cxl_pmem_region *cxlr_pmem;
480 struct cxl_region_params params;
483 struct cxl_nvdimm_bridge {
486 struct cxl_port *port;
487 struct nvdimm_bus *nvdimm_bus;
488 struct nvdimm_bus_descriptor nd_desc;
491 #define CXL_DEV_ID_LEN 19
495 struct cxl_memdev *cxlmd;
496 u8 dev_id[CXL_DEV_ID_LEN]; /* for nvdimm, string of 'serial' */
499 struct cxl_pmem_region_mapping {
500 struct cxl_memdev *cxlmd;
501 struct cxl_nvdimm *cxl_nvd;
507 struct cxl_pmem_region {
509 struct cxl_region *cxlr;
510 struct nd_region *nd_region;
511 struct range hpa_range;
513 struct cxl_pmem_region_mapping mapping[];
516 struct cxl_dax_region {
518 struct cxl_region *cxlr;
519 struct range hpa_range;
523 * struct cxl_port - logical collection of upstream port devices and
524 * downstream port devices to construct a CXL memory
526 * @dev: this port's device
527 * @uport: PCI or platform device implementing the upstream port capability
528 * @host_bridge: Shortcut to the platform attach point for this port
529 * @id: id for port device-name
530 * @dports: cxl_dport instances referenced by decoders
531 * @endpoints: cxl_ep instances, endpoints that are a descendant of this port
532 * @regions: cxl_region_ref instances, regions mapped by this port
533 * @parent_dport: dport that points to this port in the parent
534 * @decoder_ida: allocator for decoder ids
535 * @nr_dports: number of entries in @dports
536 * @hdm_end: track last allocated HDM decoder instance for allocation ordering
537 * @commit_end: cursor to track highest committed decoder for commit ordering
538 * @component_reg_phys: component register capability base address (optional)
539 * @dead: last ep has been removed, force port re-creation
540 * @depth: How deep this port is relative to the root. depth 0 is the root.
541 * @cdat: Cached CDAT data
542 * @cdat_available: Should a CDAT attribute be available in sysfs
546 struct device *uport;
547 struct device *host_bridge;
549 struct xarray dports;
550 struct xarray endpoints;
551 struct xarray regions;
552 struct cxl_dport *parent_dport;
553 struct ida decoder_ida;
557 resource_size_t component_reg_phys;
567 static inline struct cxl_dport *
568 cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev)
570 return xa_load(&port->dports, (unsigned long)dport_dev);
574 * struct cxl_dport - CXL downstream port
575 * @dport: PCI bridge or firmware device representing the downstream link
576 * @port_id: unique hardware identifier for dport in decoder target list
577 * @component_reg_phys: downstream port component registers
578 * @rcrb: base address for the Root Complex Register Block
579 * @rch: Indicate whether this dport was enumerated in RCH or VH mode
580 * @port: reference to cxl_port that contains this downstream port
583 struct device *dport;
585 resource_size_t component_reg_phys;
586 resource_size_t rcrb;
588 struct cxl_port *port;
592 * struct cxl_ep - track an endpoint's interest in a port
593 * @ep: device that hosts a generic CXL endpoint (expander or accelerator)
594 * @dport: which dport routes to this endpoint on @port
595 * @next: cxl switch port across the link attached to @dport NULL if
596 * attached to an endpoint
600 struct cxl_dport *dport;
601 struct cxl_port *next;
605 * struct cxl_region_ref - track a region's interest in a port
606 * @port: point in topology to install this reference
607 * @decoder: decoder assigned for @region in @port
608 * @region: region for this reference
609 * @endpoints: cxl_ep references for region members beneath @port
610 * @nr_targets_set: track how many targets have been programmed during setup
611 * @nr_eps: number of endpoints beneath @port
612 * @nr_targets: number of distinct targets needed to reach @nr_eps
614 struct cxl_region_ref {
615 struct cxl_port *port;
616 struct cxl_decoder *decoder;
617 struct cxl_region *region;
618 struct xarray endpoints;
625 * The platform firmware device hosting the root is also the top of the
626 * CXL port topology. All other CXL ports have another CXL port as their
627 * parent and their ->uport / host device is out-of-line of the port
630 static inline bool is_cxl_root(struct cxl_port *port)
632 return port->uport == port->dev.parent;
635 bool is_cxl_port(struct device *dev);
636 struct cxl_port *to_cxl_port(struct device *dev);
638 int devm_cxl_register_pci_bus(struct device *host, struct device *uport,
639 struct pci_bus *bus);
640 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port);
641 struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport,
642 resource_size_t component_reg_phys,
643 struct cxl_dport *parent_dport);
644 struct cxl_port *find_cxl_root(struct device *dev);
645 int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd);
646 void cxl_bus_rescan(void);
647 void cxl_bus_drain(void);
648 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd,
649 struct cxl_dport **dport);
650 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd);
652 struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port,
653 struct device *dport, int port_id,
654 resource_size_t component_reg_phys);
655 struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port,
656 struct device *dport_dev, int port_id,
657 resource_size_t component_reg_phys,
658 resource_size_t rcrb);
660 struct cxl_decoder *to_cxl_decoder(struct device *dev);
661 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev);
662 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev);
663 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev);
664 bool is_root_decoder(struct device *dev);
665 bool is_switch_decoder(struct device *dev);
666 bool is_endpoint_decoder(struct device *dev);
667 struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port,
668 unsigned int nr_targets,
669 cxl_calc_hb_fn calc_hb);
670 struct cxl_dport *cxl_hb_modulo(struct cxl_root_decoder *cxlrd, int pos);
671 struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port,
672 unsigned int nr_targets);
673 int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map);
674 struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port);
675 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map);
676 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld);
677 int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint);
680 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port);
681 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm);
682 int devm_cxl_add_passthrough_decoder(struct cxl_port *port);
684 bool is_cxl_region(struct device *dev);
686 extern struct bus_type cxl_bus_type;
690 int (*probe)(struct device *dev);
691 void (*remove)(struct device *dev);
692 struct device_driver drv;
696 static inline struct cxl_driver *to_cxl_drv(struct device_driver *drv)
698 return container_of(drv, struct cxl_driver, drv);
701 int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
702 const char *modname);
703 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
704 void cxl_driver_unregister(struct cxl_driver *cxl_drv);
706 #define module_cxl_driver(__cxl_driver) \
707 module_driver(__cxl_driver, cxl_driver_register, cxl_driver_unregister)
709 #define CXL_DEVICE_NVDIMM_BRIDGE 1
710 #define CXL_DEVICE_NVDIMM 2
711 #define CXL_DEVICE_PORT 3
712 #define CXL_DEVICE_ROOT 4
713 #define CXL_DEVICE_MEMORY_EXPANDER 5
714 #define CXL_DEVICE_REGION 6
715 #define CXL_DEVICE_PMEM_REGION 7
716 #define CXL_DEVICE_DAX_REGION 8
718 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
719 #define CXL_MODALIAS_FMT "cxl:t%d"
721 struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev);
722 struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
723 struct cxl_port *port);
724 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev);
725 bool is_cxl_nvdimm(struct device *dev);
726 bool is_cxl_nvdimm_bridge(struct device *dev);
727 int devm_cxl_add_nvdimm(struct cxl_memdev *cxlmd);
728 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct device *dev);
730 #ifdef CONFIG_CXL_REGION
731 bool is_cxl_pmem_region(struct device *dev);
732 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev);
733 int cxl_add_to_region(struct cxl_port *root,
734 struct cxl_endpoint_decoder *cxled);
735 struct cxl_dax_region *to_cxl_dax_region(struct device *dev);
737 static inline bool is_cxl_pmem_region(struct device *dev)
741 static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev)
745 static inline int cxl_add_to_region(struct cxl_port *root,
746 struct cxl_endpoint_decoder *cxled)
750 static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev)
757 * Unit test builds overrides this to __weak, find the 'strong' version
758 * of these symbols in tools/testing/cxl/.
761 #define __mock static
764 #endif /* __CXL_H__ */