1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright(c) 2020-2021 Intel Corporation. */
3 #ifndef __CXL_MEM_H__
4 #define __CXL_MEM_H__
5 #include <uapi/linux/cxl_mem.h>
6 #include <linux/cdev.h>
7 #include "cxl.h"
8
9 /* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */
10 #define CXLMDEV_STATUS_OFFSET 0x0
11 #define CXLMDEV_DEV_FATAL BIT(0)
12 #define CXLMDEV_FW_HALT BIT(1)
13 #define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2)
14 #define CXLMDEV_MS_NOT_READY 0
15 #define CXLMDEV_MS_READY 1
16 #define CXLMDEV_MS_ERROR 2
17 #define CXLMDEV_MS_DISABLED 3
18 #define CXLMDEV_READY(status) \
19 (FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \
20 CXLMDEV_MS_READY)
21 #define CXLMDEV_MBOX_IF_READY BIT(4)
22 #define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5)
23 #define CXLMDEV_RESET_NEEDED_NOT 0
24 #define CXLMDEV_RESET_NEEDED_COLD 1
25 #define CXLMDEV_RESET_NEEDED_WARM 2
26 #define CXLMDEV_RESET_NEEDED_HOT 3
27 #define CXLMDEV_RESET_NEEDED_CXL 4
28 #define CXLMDEV_RESET_NEEDED(status) \
29 (FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \
30 CXLMDEV_RESET_NEEDED_NOT)
31
32 /**
33 * struct cxl_memdev - CXL bus object representing a Type-3 Memory Device
34 * @dev: driver core device object
35 * @cdev: char dev core object for ioctl operations
36 * @cxlds: The device state backing this device
37 * @detach_work: active memdev lost a port in its ancestry
38 * @id: id number of this memdev instance.
39 */
40 struct cxl_memdev {
41 struct device dev;
42 struct cdev cdev;
43 struct cxl_dev_state *cxlds;
44 struct work_struct detach_work;
45 int id;
46 };
47
to_cxl_memdev(struct device * dev)48 static inline struct cxl_memdev *to_cxl_memdev(struct device *dev)
49 {
50 return container_of(dev, struct cxl_memdev, dev);
51 }
52
cxled_to_port(struct cxl_endpoint_decoder * cxled)53 static inline struct cxl_port *cxled_to_port(struct cxl_endpoint_decoder *cxled)
54 {
55 return to_cxl_port(cxled->cxld.dev.parent);
56 }
57
cxlrd_to_port(struct cxl_root_decoder * cxlrd)58 static inline struct cxl_port *cxlrd_to_port(struct cxl_root_decoder *cxlrd)
59 {
60 return to_cxl_port(cxlrd->cxlsd.cxld.dev.parent);
61 }
62
63 static inline struct cxl_memdev *
cxled_to_memdev(struct cxl_endpoint_decoder * cxled)64 cxled_to_memdev(struct cxl_endpoint_decoder *cxled)
65 {
66 struct cxl_port *port = to_cxl_port(cxled->cxld.dev.parent);
67
68 return to_cxl_memdev(port->uport);
69 }
70
71 bool is_cxl_memdev(struct device *dev);
is_cxl_endpoint(struct cxl_port * port)72 static inline bool is_cxl_endpoint(struct cxl_port *port)
73 {
74 return is_cxl_memdev(port->uport);
75 }
76
77 struct cxl_memdev *devm_cxl_add_memdev(struct cxl_dev_state *cxlds);
78 int devm_cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled,
79 resource_size_t base, resource_size_t len,
80 resource_size_t skipped);
81
cxl_ep_load(struct cxl_port * port,struct cxl_memdev * cxlmd)82 static inline struct cxl_ep *cxl_ep_load(struct cxl_port *port,
83 struct cxl_memdev *cxlmd)
84 {
85 if (!port)
86 return NULL;
87
88 return xa_load(&port->endpoints, (unsigned long)&cxlmd->dev);
89 }
90
91 /**
92 * struct cxl_mbox_cmd - A command to be submitted to hardware.
93 * @opcode: (input) The command set and command submitted to hardware.
94 * @payload_in: (input) Pointer to the input payload.
95 * @payload_out: (output) Pointer to the output payload. Must be allocated by
96 * the caller.
97 * @size_in: (input) Number of bytes to load from @payload_in.
98 * @size_out: (input) Max number of bytes loaded into @payload_out.
99 * (output) Number of bytes generated by the device. For fixed size
100 * outputs commands this is always expected to be deterministic. For
101 * variable sized output commands, it tells the exact number of bytes
102 * written.
103 * @return_code: (output) Error code returned from hardware.
104 *
105 * This is the primary mechanism used to send commands to the hardware.
106 * All the fields except @payload_* correspond exactly to the fields described in
107 * Command Register section of the CXL 2.0 8.2.8.4.5. @payload_in and
108 * @payload_out are written to, and read from the Command Payload Registers
109 * defined in CXL 2.0 8.2.8.4.8.
110 */
111 struct cxl_mbox_cmd {
112 u16 opcode;
113 void *payload_in;
114 void *payload_out;
115 size_t size_in;
116 size_t size_out;
117 u16 return_code;
118 };
119
120 /*
121 * Per CXL 2.0 Section 8.2.8.4.5.1
122 */
123 #define CMD_CMD_RC_TABLE \
124 C(SUCCESS, 0, NULL), \
125 C(BACKGROUND, -ENXIO, "background cmd started successfully"), \
126 C(INPUT, -ENXIO, "cmd input was invalid"), \
127 C(UNSUPPORTED, -ENXIO, "cmd is not supported"), \
128 C(INTERNAL, -ENXIO, "internal device error"), \
129 C(RETRY, -ENXIO, "temporary error, retry once"), \
130 C(BUSY, -ENXIO, "ongoing background operation"), \
131 C(MEDIADISABLED, -ENXIO, "media access is disabled"), \
132 C(FWINPROGRESS, -ENXIO, "one FW package can be transferred at a time"), \
133 C(FWOOO, -ENXIO, "FW package content was transferred out of order"), \
134 C(FWAUTH, -ENXIO, "FW package authentication failed"), \
135 C(FWSLOT, -ENXIO, "FW slot is not supported for requested operation"), \
136 C(FWROLLBACK, -ENXIO, "rolled back to the previous active FW"), \
137 C(FWRESET, -ENXIO, "FW failed to activate, needs cold reset"), \
138 C(HANDLE, -ENXIO, "one or more Event Record Handles were invalid"), \
139 C(PADDR, -ENXIO, "physical address specified is invalid"), \
140 C(POISONLMT, -ENXIO, "poison injection limit has been reached"), \
141 C(MEDIAFAILURE, -ENXIO, "permanent issue with the media"), \
142 C(ABORT, -ENXIO, "background cmd was aborted by device"), \
143 C(SECURITY, -ENXIO, "not valid in the current security state"), \
144 C(PASSPHRASE, -ENXIO, "phrase doesn't match current set passphrase"), \
145 C(MBUNSUPPORTED, -ENXIO, "unsupported on the mailbox it was issued on"),\
146 C(PAYLOADLEN, -ENXIO, "invalid payload length")
147
148 #undef C
149 #define C(a, b, c) CXL_MBOX_CMD_RC_##a
150 enum { CMD_CMD_RC_TABLE };
151 #undef C
152 #define C(a, b, c) { b, c }
153 struct cxl_mbox_cmd_rc {
154 int err;
155 const char *desc;
156 };
157
158 static const
159 struct cxl_mbox_cmd_rc cxl_mbox_cmd_rctable[] ={ CMD_CMD_RC_TABLE };
160 #undef C
161
cxl_mbox_cmd_rc2str(struct cxl_mbox_cmd * mbox_cmd)162 static inline const char *cxl_mbox_cmd_rc2str(struct cxl_mbox_cmd *mbox_cmd)
163 {
164 return cxl_mbox_cmd_rctable[mbox_cmd->return_code].desc;
165 }
166
cxl_mbox_cmd_rc2errno(struct cxl_mbox_cmd * mbox_cmd)167 static inline int cxl_mbox_cmd_rc2errno(struct cxl_mbox_cmd *mbox_cmd)
168 {
169 return cxl_mbox_cmd_rctable[mbox_cmd->return_code].err;
170 }
171
172 /*
173 * CXL 2.0 - Memory capacity multiplier
174 * See Section 8.2.9.5
175 *
176 * Volatile, Persistent, and Partition capacities are specified to be in
177 * multiples of 256MB - define a multiplier to convert to/from bytes.
178 */
179 #define CXL_CAPACITY_MULTIPLIER SZ_256M
180
181 /**
182 * struct cxl_endpoint_dvsec_info - Cached DVSEC info
183 * @mem_enabled: cached value of mem_enabled in the DVSEC, PCIE_DEVICE
184 * @ranges: Number of active HDM ranges this device uses.
185 * @dvsec_range: cached attributes of the ranges in the DVSEC, PCIE_DEVICE
186 */
187 struct cxl_endpoint_dvsec_info {
188 bool mem_enabled;
189 int ranges;
190 struct range dvsec_range[2];
191 };
192
193 /**
194 * struct cxl_dev_state - The driver device state
195 *
196 * cxl_dev_state represents the CXL driver/device state. It provides an
197 * interface to mailbox commands as well as some cached data about the device.
198 * Currently only memory devices are represented.
199 *
200 * @dev: The device associated with this CXL state
201 * @regs: Parsed register blocks
202 * @cxl_dvsec: Offset to the PCIe device DVSEC
203 * @payload_size: Size of space for payload
204 * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register)
205 * @lsa_size: Size of Label Storage Area
206 * (CXL 2.0 8.2.9.5.1.1 Identify Memory Device)
207 * @mbox_mutex: Mutex to synchronize mailbox access.
208 * @firmware_version: Firmware version for the memory device.
209 * @enabled_cmds: Hardware commands found enabled in CEL.
210 * @exclusive_cmds: Commands that are kernel-internal only
211 * @dpa_res: Overall DPA resource tree for the device
212 * @pmem_res: Active Persistent memory capacity configuration
213 * @ram_res: Active Volatile memory capacity configuration
214 * @total_bytes: sum of all possible capacities
215 * @volatile_only_bytes: hard volatile capacity
216 * @persistent_only_bytes: hard persistent capacity
217 * @partition_align_bytes: alignment size for partition-able capacity
218 * @active_volatile_bytes: sum of hard + soft volatile
219 * @active_persistent_bytes: sum of hard + soft persistent
220 * @next_volatile_bytes: volatile capacity change pending device reset
221 * @next_persistent_bytes: persistent capacity change pending device reset
222 * @component_reg_phys: register base of component registers
223 * @info: Cached DVSEC information about the device.
224 * @serial: PCIe Device Serial Number
225 * @doe_mbs: PCI DOE mailbox array
226 * @mbox_send: @dev specific transport for transmitting mailbox commands
227 *
228 * See section 8.2.9.5.2 Capacity Configuration and Label Storage for
229 * details on capacity parameters.
230 */
231 struct cxl_dev_state {
232 struct device *dev;
233
234 struct cxl_regs regs;
235 int cxl_dvsec;
236
237 size_t payload_size;
238 size_t lsa_size;
239 struct mutex mbox_mutex; /* Protects device mailbox and firmware */
240 char firmware_version[0x10];
241 DECLARE_BITMAP(enabled_cmds, CXL_MEM_COMMAND_ID_MAX);
242 DECLARE_BITMAP(exclusive_cmds, CXL_MEM_COMMAND_ID_MAX);
243
244 struct resource dpa_res;
245 struct resource pmem_res;
246 struct resource ram_res;
247 u64 total_bytes;
248 u64 volatile_only_bytes;
249 u64 persistent_only_bytes;
250 u64 partition_align_bytes;
251
252 u64 active_volatile_bytes;
253 u64 active_persistent_bytes;
254 u64 next_volatile_bytes;
255 u64 next_persistent_bytes;
256
257 resource_size_t component_reg_phys;
258 u64 serial;
259
260 struct xarray doe_mbs;
261
262 int (*mbox_send)(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *cmd);
263 };
264
265 enum cxl_opcode {
266 CXL_MBOX_OP_INVALID = 0x0000,
267 CXL_MBOX_OP_RAW = CXL_MBOX_OP_INVALID,
268 CXL_MBOX_OP_GET_FW_INFO = 0x0200,
269 CXL_MBOX_OP_ACTIVATE_FW = 0x0202,
270 CXL_MBOX_OP_GET_SUPPORTED_LOGS = 0x0400,
271 CXL_MBOX_OP_GET_LOG = 0x0401,
272 CXL_MBOX_OP_IDENTIFY = 0x4000,
273 CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100,
274 CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101,
275 CXL_MBOX_OP_GET_LSA = 0x4102,
276 CXL_MBOX_OP_SET_LSA = 0x4103,
277 CXL_MBOX_OP_GET_HEALTH_INFO = 0x4200,
278 CXL_MBOX_OP_GET_ALERT_CONFIG = 0x4201,
279 CXL_MBOX_OP_SET_ALERT_CONFIG = 0x4202,
280 CXL_MBOX_OP_GET_SHUTDOWN_STATE = 0x4203,
281 CXL_MBOX_OP_SET_SHUTDOWN_STATE = 0x4204,
282 CXL_MBOX_OP_GET_POISON = 0x4300,
283 CXL_MBOX_OP_INJECT_POISON = 0x4301,
284 CXL_MBOX_OP_CLEAR_POISON = 0x4302,
285 CXL_MBOX_OP_GET_SCAN_MEDIA_CAPS = 0x4303,
286 CXL_MBOX_OP_SCAN_MEDIA = 0x4304,
287 CXL_MBOX_OP_GET_SCAN_MEDIA = 0x4305,
288 CXL_MBOX_OP_MAX = 0x10000
289 };
290
291 #define DEFINE_CXL_CEL_UUID \
292 UUID_INIT(0xda9c0b5, 0xbf41, 0x4b78, 0x8f, 0x79, 0x96, 0xb1, 0x62, \
293 0x3b, 0x3f, 0x17)
294
295 #define DEFINE_CXL_VENDOR_DEBUG_UUID \
296 UUID_INIT(0xe1819d9, 0x11a9, 0x400c, 0x81, 0x1f, 0xd6, 0x07, 0x19, \
297 0x40, 0x3d, 0x86)
298
299 struct cxl_mbox_get_supported_logs {
300 __le16 entries;
301 u8 rsvd[6];
302 struct cxl_gsl_entry {
303 uuid_t uuid;
304 __le32 size;
305 } __packed entry[];
306 } __packed;
307
308 struct cxl_cel_entry {
309 __le16 opcode;
310 __le16 effect;
311 } __packed;
312
313 struct cxl_mbox_get_log {
314 uuid_t uuid;
315 __le32 offset;
316 __le32 length;
317 } __packed;
318
319 /* See CXL 2.0 Table 175 Identify Memory Device Output Payload */
320 struct cxl_mbox_identify {
321 char fw_revision[0x10];
322 __le64 total_capacity;
323 __le64 volatile_capacity;
324 __le64 persistent_capacity;
325 __le64 partition_align;
326 __le16 info_event_log_size;
327 __le16 warning_event_log_size;
328 __le16 failure_event_log_size;
329 __le16 fatal_event_log_size;
330 __le32 lsa_size;
331 u8 poison_list_max_mer[3];
332 __le16 inject_poison_limit;
333 u8 poison_caps;
334 u8 qos_telemetry_caps;
335 } __packed;
336
337 struct cxl_mbox_get_partition_info {
338 __le64 active_volatile_cap;
339 __le64 active_persistent_cap;
340 __le64 next_volatile_cap;
341 __le64 next_persistent_cap;
342 } __packed;
343
344 struct cxl_mbox_get_lsa {
345 __le32 offset;
346 __le32 length;
347 } __packed;
348
349 struct cxl_mbox_set_lsa {
350 __le32 offset;
351 __le32 reserved;
352 u8 data[];
353 } __packed;
354
355 struct cxl_mbox_set_partition_info {
356 __le64 volatile_capacity;
357 u8 flags;
358 } __packed;
359
360 #define CXL_SET_PARTITION_IMMEDIATE_FLAG BIT(0)
361
362 /**
363 * struct cxl_mem_command - Driver representation of a memory device command
364 * @info: Command information as it exists for the UAPI
365 * @opcode: The actual bits used for the mailbox protocol
366 * @flags: Set of flags effecting driver behavior.
367 *
368 * * %CXL_CMD_FLAG_FORCE_ENABLE: In cases of error, commands with this flag
369 * will be enabled by the driver regardless of what hardware may have
370 * advertised.
371 *
372 * The cxl_mem_command is the driver's internal representation of commands that
373 * are supported by the driver. Some of these commands may not be supported by
374 * the hardware. The driver will use @info to validate the fields passed in by
375 * the user then submit the @opcode to the hardware.
376 *
377 * See struct cxl_command_info.
378 */
379 struct cxl_mem_command {
380 struct cxl_command_info info;
381 enum cxl_opcode opcode;
382 u32 flags;
383 #define CXL_CMD_FLAG_NONE 0
384 #define CXL_CMD_FLAG_FORCE_ENABLE BIT(0)
385 };
386
387 int cxl_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in,
388 size_t in_size, void *out, size_t out_size);
389 int cxl_dev_state_identify(struct cxl_dev_state *cxlds);
390 int cxl_await_media_ready(struct cxl_dev_state *cxlds);
391 int cxl_enumerate_cmds(struct cxl_dev_state *cxlds);
392 int cxl_mem_create_range_info(struct cxl_dev_state *cxlds);
393 struct cxl_dev_state *cxl_dev_state_create(struct device *dev);
394 void set_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds);
395 void clear_exclusive_cxl_commands(struct cxl_dev_state *cxlds, unsigned long *cmds);
396 #ifdef CONFIG_CXL_SUSPEND
397 void cxl_mem_active_inc(void);
398 void cxl_mem_active_dec(void);
399 #else
cxl_mem_active_inc(void)400 static inline void cxl_mem_active_inc(void)
401 {
402 }
cxl_mem_active_dec(void)403 static inline void cxl_mem_active_dec(void)
404 {
405 }
406 #endif
407
408 struct cxl_hdm {
409 struct cxl_component_regs regs;
410 unsigned int decoder_count;
411 unsigned int target_count;
412 unsigned int interleave_mask;
413 struct cxl_port *port;
414 };
415
416 struct seq_file;
417 struct dentry *cxl_debugfs_create_dir(const char *dir);
418 void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds);
419 #endif /* __CXL_MEM_H__ */
420