| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Dan J Williams | 1898 | 43.57% | 22 | 36.07% |
| Ira Weiny | 984 | 22.59% | 9 | 14.75% |
| Ben Widawsky | 762 | 17.49% | 8 | 13.11% |
| Alison Schofield | 523 | 12.01% | 10 | 16.39% |
| Jonathan Cameron | 87 | 2.00% | 3 | 4.92% |
| Robert Richter | 57 | 1.31% | 3 | 4.92% |
| Vishal Verma | 39 | 0.90% | 3 | 4.92% |
| Davidlohr Bueso A | 5 | 0.11% | 2 | 3.28% |
| Dan Carpenter | 1 | 0.02% | 1 | 1.64% |
| Total | 4356 | 61 |
// SPDX-License-Identifier: GPL-2.0-only /* Copyright(c) 2020 Intel Corporation. All rights reserved. */ #include <linux/io-64-nonatomic-lo-hi.h> #include <linux/security.h> #include <linux/debugfs.h> #include <linux/ktime.h> #include <linux/mutex.h> #include <cxlmem.h> #include <cxl.h> #include "core.h" #include "trace.h" static bool cxl_raw_allow_all; /** * DOC: cxl mbox * * Core implementation of the CXL 2.0 Type-3 Memory Device Mailbox. The * implementation is used by the cxl_pci driver to initialize the device * and implement the cxl_mem.h IOCTL UAPI. It also implements the * backend of the cxl_pmem_ctl() transport for LIBNVDIMM. */ #define cxl_for_each_cmd(cmd) \ for ((cmd) = &cxl_mem_commands[0]; \ ((cmd) - cxl_mem_commands) < ARRAY_SIZE(cxl_mem_commands); (cmd)++) #define CXL_CMD(_id, sin, sout, _flags) \ [CXL_MEM_COMMAND_ID_##_id] = { \ .info = { \ .id = CXL_MEM_COMMAND_ID_##_id, \ .size_in = sin, \ .size_out = sout, \ }, \ .opcode = CXL_MBOX_OP_##_id, \ .flags = _flags, \ } #define CXL_VARIABLE_PAYLOAD ~0U /* * This table defines the supported mailbox commands for the driver. This table * is made up of a UAPI structure. Non-negative values as parameters in the * table will be validated against the user's input. For example, if size_in is * 0, and the user passed in 1, it is an error. */ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = { CXL_CMD(IDENTIFY, 0, 0x43, CXL_CMD_FLAG_FORCE_ENABLE), #ifdef CONFIG_CXL_MEM_RAW_COMMANDS CXL_CMD(RAW, CXL_VARIABLE_PAYLOAD, CXL_VARIABLE_PAYLOAD, 0), #endif CXL_CMD(GET_SUPPORTED_LOGS, 0, CXL_VARIABLE_PAYLOAD, CXL_CMD_FLAG_FORCE_ENABLE), CXL_CMD(GET_FW_INFO, 0, 0x50, 0), CXL_CMD(GET_PARTITION_INFO, 0, 0x20, 0), CXL_CMD(GET_LSA, 0x8, CXL_VARIABLE_PAYLOAD, 0), CXL_CMD(GET_HEALTH_INFO, 0, 0x12, 0), CXL_CMD(GET_LOG, 0x18, CXL_VARIABLE_PAYLOAD, CXL_CMD_FLAG_FORCE_ENABLE), CXL_CMD(SET_PARTITION_INFO, 0x0a, 0, 0), CXL_CMD(SET_LSA, CXL_VARIABLE_PAYLOAD, 0, 0), CXL_CMD(GET_ALERT_CONFIG, 0, 0x10, 0), CXL_CMD(SET_ALERT_CONFIG, 0xc, 0, 0), CXL_CMD(GET_SHUTDOWN_STATE, 0, 0x1, 0), CXL_CMD(SET_SHUTDOWN_STATE, 0x1, 0, 0), CXL_CMD(GET_POISON, 0x10, CXL_VARIABLE_PAYLOAD, 0), CXL_CMD(INJECT_POISON, 0x8, 0, 0), CXL_CMD(CLEAR_POISON, 0x48, 0, 0), CXL_CMD(GET_SCAN_MEDIA_CAPS, 0x10, 0x4, 0), CXL_CMD(SCAN_MEDIA, 0x11, 0, 0), CXL_CMD(GET_SCAN_MEDIA, 0, CXL_VARIABLE_PAYLOAD, 0), }; /* * Commands that RAW doesn't permit. The rationale for each: * * CXL_MBOX_OP_ACTIVATE_FW: Firmware activation requires adjustment / * coordination of transaction timeout values at the root bridge level. * * CXL_MBOX_OP_SET_PARTITION_INFO: The device memory map may change live * and needs to be coordinated with HDM updates. * * CXL_MBOX_OP_SET_LSA: The label storage area may be cached by the * driver and any writes from userspace invalidates those contents. * * CXL_MBOX_OP_SET_SHUTDOWN_STATE: Set shutdown state assumes no writes * to the device after it is marked clean, userspace can not make that * assertion. * * CXL_MBOX_OP_[GET_]SCAN_MEDIA: The kernel provides a native error list that * is kept up to date with patrol notifications and error management. */ static u16 cxl_disabled_raw_commands[] = { CXL_MBOX_OP_ACTIVATE_FW, CXL_MBOX_OP_SET_PARTITION_INFO, CXL_MBOX_OP_SET_LSA, CXL_MBOX_OP_SET_SHUTDOWN_STATE, CXL_MBOX_OP_SCAN_MEDIA, CXL_MBOX_OP_GET_SCAN_MEDIA, }; /* * Command sets that RAW doesn't permit. All opcodes in this set are * disabled because they pass plain text security payloads over the * user/kernel boundary. This functionality is intended to be wrapped * behind the keys ABI which allows for encrypted payloads in the UAPI */ static u8 security_command_sets[] = { 0x44, /* Sanitize */ 0x45, /* Persistent Memory Data-at-rest Security */ 0x46, /* Security Passthrough */ }; static bool cxl_is_security_command(u16 opcode) { int i; for (i = 0; i < ARRAY_SIZE(security_command_sets); i++) if (security_command_sets[i] == (opcode >> 8)) return true; return false; } static struct cxl_mem_command *cxl_mem_find_command(u16 opcode) { struct cxl_mem_command *c; cxl_for_each_cmd(c) if (c->opcode == opcode) return c; return NULL; } static const char *cxl_mem_opcode_to_name(u16 opcode) { struct cxl_mem_command *c; c = cxl_mem_find_command(opcode); if (!c) return NULL; return cxl_command_names[c->info.id].name; } /** * cxl_internal_send_cmd() - Kernel internal interface to send a mailbox command * @cxlds: The device data for the operation * @mbox_cmd: initialized command to execute * * Context: Any context. * Return: * * %>=0 - Number of bytes returned in @out. * * %-E2BIG - Payload is too large for hardware. * * %-EBUSY - Couldn't acquire exclusive mailbox access. * * %-EFAULT - Hardware error occurred. * * %-ENXIO - Command completed, but device reported an error. * * %-EIO - Unexpected output size. * * Mailbox commands may execute successfully yet the device itself reported an * error. While this distinction can be useful for commands from userspace, the * kernel will only be able to use results when both are successful. */ int cxl_internal_send_cmd(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *mbox_cmd) { size_t out_size, min_out; int rc; if (mbox_cmd->size_in > cxlds->payload_size || mbox_cmd->size_out > cxlds->payload_size) return -E2BIG; out_size = mbox_cmd->size_out; min_out = mbox_cmd->min_out; rc = cxlds->mbox_send(cxlds, mbox_cmd); /* * EIO is reserved for a payload size mismatch and mbox_send() * may not return this error. */ if (WARN_ONCE(rc == -EIO, "Bad return code: -EIO")) return -ENXIO; if (rc) return rc; if (mbox_cmd->return_code != CXL_MBOX_CMD_RC_SUCCESS) return cxl_mbox_cmd_rc2errno(mbox_cmd); if (!out_size) return 0; /* * Variable sized output needs to at least satisfy the caller's * minimum if not the fully requested size. */ if (min_out == 0) min_out = out_size; if (mbox_cmd->size_out < min_out) return -EIO; return 0; } EXPORT_SYMBOL_NS_GPL(cxl_internal_send_cmd, CXL); static bool cxl_mem_raw_command_allowed(u16 opcode) { int i; if (!IS_ENABLED(CONFIG_CXL_MEM_RAW_COMMANDS)) return false; if (security_locked_down(LOCKDOWN_PCI_ACCESS)) return false; if (cxl_raw_allow_all) return true; if (cxl_is_security_command(opcode)) return false; for (i = 0; i < ARRAY_SIZE(cxl_disabled_raw_commands); i++) if (cxl_disabled_raw_commands[i] == opcode) return false; return true; } /** * cxl_payload_from_user_allowed() - Check contents of in_payload. * @opcode: The mailbox command opcode. * @payload_in: Pointer to the input payload passed in from user space. * * Return: * * true - payload_in passes check for @opcode. * * false - payload_in contains invalid or unsupported values. * * The driver may inspect payload contents before sending a mailbox * command from user space to the device. The intent is to reject * commands with input payloads that are known to be unsafe. This * check is not intended to replace the users careful selection of * mailbox command parameters and makes no guarantee that the user * command will succeed, nor that it is appropriate. * * The specific checks are determined by the opcode. */ static bool cxl_payload_from_user_allowed(u16 opcode, void *payload_in) { switch (opcode) { case CXL_MBOX_OP_SET_PARTITION_INFO: { struct cxl_mbox_set_partition_info *pi = payload_in; if (pi->flags & CXL_SET_PARTITION_IMMEDIATE_FLAG) return false; break; } default: break; } return true; } static int cxl_mbox_cmd_ctor(struct cxl_mbox_cmd *mbox, struct cxl_dev_state *cxlds, u16 opcode, size_t in_size, size_t out_size, u64 in_payload) { *mbox = (struct cxl_mbox_cmd) { .opcode = opcode, .size_in = in_size, }; if (in_size) { mbox->payload_in = vmemdup_user(u64_to_user_ptr(in_payload), in_size); if (IS_ERR(mbox->payload_in)) return PTR_ERR(mbox->payload_in); if (!cxl_payload_from_user_allowed(opcode, mbox->payload_in)) { dev_dbg(cxlds->dev, "%s: input payload not allowed\n", cxl_mem_opcode_to_name(opcode)); kvfree(mbox->payload_in); return -EBUSY; } } /* Prepare to handle a full payload for variable sized output */ if (out_size == CXL_VARIABLE_PAYLOAD) mbox->size_out = cxlds->payload_size; else mbox->size_out = out_size; if (mbox->size_out) { mbox->payload_out = kvzalloc(mbox->size_out, GFP_KERNEL); if (!mbox->payload_out) { kvfree(mbox->payload_in); return -ENOMEM; } } return 0; } static void cxl_mbox_cmd_dtor(struct cxl_mbox_cmd *mbox) { kvfree(mbox->payload_in); kvfree(mbox->payload_out); } static int cxl_to_mem_cmd_raw(struct cxl_mem_command *mem_cmd, const struct cxl_send_command *send_cmd, struct cxl_dev_state *cxlds) { if (send_cmd->raw.rsvd) return -EINVAL; /* * Unlike supported commands, the output size of RAW commands * gets passed along without further checking, so it must be * validated here. */ if (send_cmd->out.size > cxlds->payload_size) return -EINVAL; if (!cxl_mem_raw_command_allowed(send_cmd->raw.opcode)) return -EPERM; dev_WARN_ONCE(cxlds->dev, true, "raw command path used\n"); *mem_cmd = (struct cxl_mem_command) { .info = { .id = CXL_MEM_COMMAND_ID_RAW, .size_in = send_cmd->in.size, .size_out = send_cmd->out.size, }, .opcode = send_cmd->raw.opcode }; return 0; } static int cxl_to_mem_cmd(struct cxl_mem_command *mem_cmd, const struct cxl_send_command *send_cmd, struct cxl_dev_state *cxlds) { struct cxl_mem_command *c = &cxl_mem_commands[send_cmd->id]; const struct cxl_command_info *info = &c->info; if (send_cmd->flags & ~CXL_MEM_COMMAND_FLAG_MASK) return -EINVAL; if (send_cmd->rsvd) return -EINVAL; if (send_cmd->in.rsvd || send_cmd->out.rsvd) return -EINVAL; /* Check that the command is enabled for hardware */ if (!test_bit(info->id, cxlds->enabled_cmds)) return -ENOTTY; /* Check that the command is not claimed for exclusive kernel use */ if (test_bit(info->id, cxlds->exclusive_cmds)) return -EBUSY; /* Check the input buffer is the expected size */ if ((info->size_in != CXL_VARIABLE_PAYLOAD) && (info->size_in != send_cmd->in.size)) return -ENOMEM; /* Check the output buffer is at least large enough */ if ((info->size_out != CXL_VARIABLE_PAYLOAD) && (send_cmd->out.size < info->size_out)) return -ENOMEM; *mem_cmd = (struct cxl_mem_command) { .info = { .id = info->id, .flags = info->flags, .size_in = send_cmd->in.size, .size_out = send_cmd->out.size, }, .opcode = c->opcode }; return 0; } /** * cxl_validate_cmd_from_user() - Check fields for CXL_MEM_SEND_COMMAND. * @mbox_cmd: Sanitized and populated &struct cxl_mbox_cmd. * @cxlds: The device data for the operation * @send_cmd: &struct cxl_send_command copied in from userspace. * * Return: * * %0 - @out_cmd is ready to send. * * %-ENOTTY - Invalid command specified. * * %-EINVAL - Reserved fields or invalid values were used. * * %-ENOMEM - Input or output buffer wasn't sized properly. * * %-EPERM - Attempted to use a protected command. * * %-EBUSY - Kernel has claimed exclusive access to this opcode * * The result of this command is a fully validated command in @mbox_cmd that is * safe to send to the hardware. */ static int cxl_validate_cmd_from_user(struct cxl_mbox_cmd *mbox_cmd, struct cxl_dev_state *cxlds, const struct cxl_send_command *send_cmd) { struct cxl_mem_command mem_cmd; int rc; if (send_cmd->id == 0 || send_cmd->id >= CXL_MEM_COMMAND_ID_MAX) return -ENOTTY; /* * The user can never specify an input payload larger than what hardware * supports, but output can be arbitrarily large (simply write out as * much data as the hardware provides). */ if (send_cmd->in.size > cxlds->payload_size) return -EINVAL; /* Sanitize and construct a cxl_mem_command */ if (send_cmd->id == CXL_MEM_COMMAND_ID_RAW) rc = cxl_to_mem_cmd_raw(&mem_cmd, send_cmd, cxlds); else rc = cxl_to_mem_cmd(&mem_cmd, send_cmd, cxlds); if (rc) return rc; /* Sanitize and construct a cxl_mbox_cmd */ return cxl_mbox_cmd_ctor(mbox_cmd, cxlds, mem_cmd.opcode, mem_cmd.info.size_in, mem_cmd.info.size_out, send_cmd->in.payload); } int cxl_query_cmd(struct cxl_memdev *cxlmd, struct cxl_mem_query_commands __user *q) { struct device *dev = &cxlmd->dev; struct cxl_mem_command *cmd; u32 n_commands; int j = 0; dev_dbg(dev, "Query IOCTL\n"); if (get_user(n_commands, &q->n_commands)) return -EFAULT; /* returns the total number if 0 elements are requested. */ if (n_commands == 0) return put_user(ARRAY_SIZE(cxl_mem_commands), &q->n_commands); /* * otherwise, return max(n_commands, total commands) cxl_command_info * structures. */ cxl_for_each_cmd(cmd) { struct cxl_command_info info = cmd->info; if (test_bit(info.id, cxlmd->cxlds->enabled_cmds)) info.flags |= CXL_MEM_COMMAND_FLAG_ENABLED; if (test_bit(info.id, cxlmd->cxlds->exclusive_cmds)) info.flags |= CXL_MEM_COMMAND_FLAG_EXCLUSIVE; if (copy_to_user(&q->commands[j++], &info, sizeof(info))) return -EFAULT; if (j == n_commands) break; } return 0; } /** * handle_mailbox_cmd_from_user() - Dispatch a mailbox command for userspace. * @cxlds: The device data for the operation * @mbox_cmd: The validated mailbox command. * @out_payload: Pointer to userspace's output payload. * @size_out: (Input) Max payload size to copy out. * (Output) Payload size hardware generated. * @retval: Hardware generated return code from the operation. * * Return: * * %0 - Mailbox transaction succeeded. This implies the mailbox * protocol completed successfully not that the operation itself * was successful. * * %-ENOMEM - Couldn't allocate a bounce buffer. * * %-EFAULT - Something happened with copy_to/from_user. * * %-EINTR - Mailbox acquisition interrupted. * * %-EXXX - Transaction level failures. * * Dispatches a mailbox command on behalf of a userspace request. * The output payload is copied to userspace. * * See cxl_send_cmd(). */ static int handle_mailbox_cmd_from_user(struct cxl_dev_state *cxlds, struct cxl_mbox_cmd *mbox_cmd, u64 out_payload, s32 *size_out, u32 *retval) { struct device *dev = cxlds->dev; int rc; dev_dbg(dev, "Submitting %s command for user\n" "\topcode: %x\n" "\tsize: %zx\n", cxl_mem_opcode_to_name(mbox_cmd->opcode), mbox_cmd->opcode, mbox_cmd->size_in); rc = cxlds->mbox_send(cxlds, mbox_cmd); if (rc) goto out; /* * @size_out contains the max size that's allowed to be written back out * to userspace. While the payload may have written more output than * this it will have to be ignored. */ if (mbox_cmd->size_out) { dev_WARN_ONCE(dev, mbox_cmd->size_out > *size_out, "Invalid return size\n"); if (copy_to_user(u64_to_user_ptr(out_payload), mbox_cmd->payload_out, mbox_cmd->size_out)) { rc = -EFAULT; goto out; } } *size_out = mbox_cmd->size_out; *retval = mbox_cmd->return_code; out: cxl_mbox_cmd_dtor(mbox_cmd); return rc; } int cxl_send_cmd(struct cxl_memdev *cxlmd, struct cxl_send_command __user *s) { struct cxl_dev_state *cxlds = cxlmd->cxlds; struct device *dev = &cxlmd->dev; struct cxl_send_command send; struct cxl_mbox_cmd mbox_cmd; int rc; dev_dbg(dev, "Send IOCTL\n"); if (copy_from_user(&send, s, sizeof(send))) return -EFAULT; rc = cxl_validate_cmd_from_user(&mbox_cmd, cxlmd->cxlds, &send); if (rc) return rc; rc = handle_mailbox_cmd_from_user(cxlds, &mbox_cmd, send.out.payload, &send.out.size, &send.retval); if (rc) return rc; if (copy_to_user(s, &send, sizeof(send))) return -EFAULT; return 0; } static int cxl_xfer_log(struct cxl_dev_state *cxlds, uuid_t *uuid, u32 *size, u8 *out) { u32 remaining = *size; u32 offset = 0; while (remaining) { u32 xfer_size = min_t(u32, remaining, cxlds->payload_size); struct cxl_mbox_cmd mbox_cmd; struct cxl_mbox_get_log log; int rc; log = (struct cxl_mbox_get_log) { .uuid = *uuid, .offset = cpu_to_le32(offset), .length = cpu_to_le32(xfer_size), }; mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_GET_LOG, .size_in = sizeof(log), .payload_in = &log, .size_out = xfer_size, .payload_out = out, }; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); /* * The output payload length that indicates the number * of valid bytes can be smaller than the Log buffer * size. */ if (rc == -EIO && mbox_cmd.size_out < xfer_size) { offset += mbox_cmd.size_out; break; } if (rc < 0) return rc; out += xfer_size; remaining -= xfer_size; offset += xfer_size; } *size = offset; return 0; } /** * cxl_walk_cel() - Walk through the Command Effects Log. * @cxlds: The device data for the operation * @size: Length of the Command Effects Log. * @cel: CEL * * Iterate over each entry in the CEL and determine if the driver supports the * command. If so, the command is enabled for the device and can be used later. */ static void cxl_walk_cel(struct cxl_dev_state *cxlds, size_t size, u8 *cel) { struct cxl_cel_entry *cel_entry; const int cel_entries = size / sizeof(*cel_entry); int i; cel_entry = (struct cxl_cel_entry *) cel; for (i = 0; i < cel_entries; i++) { u16 opcode = le16_to_cpu(cel_entry[i].opcode); struct cxl_mem_command *cmd = cxl_mem_find_command(opcode); if (!cmd) { dev_dbg(cxlds->dev, "Opcode 0x%04x unsupported by driver\n", opcode); continue; } set_bit(cmd->info.id, cxlds->enabled_cmds); dev_dbg(cxlds->dev, "Opcode 0x%04x enabled\n", opcode); } } static struct cxl_mbox_get_supported_logs *cxl_get_gsl(struct cxl_dev_state *cxlds) { struct cxl_mbox_get_supported_logs *ret; struct cxl_mbox_cmd mbox_cmd; int rc; ret = kvmalloc(cxlds->payload_size, GFP_KERNEL); if (!ret) return ERR_PTR(-ENOMEM); mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_GET_SUPPORTED_LOGS, .size_out = cxlds->payload_size, .payload_out = ret, /* At least the record number field must be valid */ .min_out = 2, }; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc < 0) { kvfree(ret); return ERR_PTR(rc); } return ret; } enum { CEL_UUID, VENDOR_DEBUG_UUID, }; /* See CXL 2.0 Table 170. Get Log Input Payload */ static const uuid_t log_uuid[] = { [CEL_UUID] = DEFINE_CXL_CEL_UUID, [VENDOR_DEBUG_UUID] = DEFINE_CXL_VENDOR_DEBUG_UUID, }; /** * cxl_enumerate_cmds() - Enumerate commands for a device. * @cxlds: The device data for the operation * * Returns 0 if enumerate completed successfully. * * CXL devices have optional support for certain commands. This function will * determine the set of supported commands for the hardware and update the * enabled_cmds bitmap in the @cxlds. */ int cxl_enumerate_cmds(struct cxl_dev_state *cxlds) { struct cxl_mbox_get_supported_logs *gsl; struct device *dev = cxlds->dev; struct cxl_mem_command *cmd; int i, rc; gsl = cxl_get_gsl(cxlds); if (IS_ERR(gsl)) return PTR_ERR(gsl); rc = -ENOENT; for (i = 0; i < le16_to_cpu(gsl->entries); i++) { u32 size = le32_to_cpu(gsl->entry[i].size); uuid_t uuid = gsl->entry[i].uuid; u8 *log; dev_dbg(dev, "Found LOG type %pU of size %d", &uuid, size); if (!uuid_equal(&uuid, &log_uuid[CEL_UUID])) continue; log = kvmalloc(size, GFP_KERNEL); if (!log) { rc = -ENOMEM; goto out; } rc = cxl_xfer_log(cxlds, &uuid, &size, log); if (rc) { kvfree(log); goto out; } cxl_walk_cel(cxlds, size, log); kvfree(log); /* In case CEL was bogus, enable some default commands. */ cxl_for_each_cmd(cmd) if (cmd->flags & CXL_CMD_FLAG_FORCE_ENABLE) set_bit(cmd->info.id, cxlds->enabled_cmds); /* Found the required CEL */ rc = 0; } out: kvfree(gsl); return rc; } EXPORT_SYMBOL_NS_GPL(cxl_enumerate_cmds, CXL); /* * General Media Event Record * CXL rev 3.0 Section 8.2.9.2.1.1; Table 8-43 */ static const uuid_t gen_media_event_uuid = UUID_INIT(0xfbcd0a77, 0xc260, 0x417f, 0x85, 0xa9, 0x08, 0x8b, 0x16, 0x21, 0xeb, 0xa6); /* * DRAM Event Record * CXL rev 3.0 section 8.2.9.2.1.2; Table 8-44 */ static const uuid_t dram_event_uuid = UUID_INIT(0x601dcbb3, 0x9c06, 0x4eab, 0xb8, 0xaf, 0x4e, 0x9b, 0xfb, 0x5c, 0x96, 0x24); /* * Memory Module Event Record * CXL rev 3.0 section 8.2.9.2.1.3; Table 8-45 */ static const uuid_t mem_mod_event_uuid = UUID_INIT(0xfe927475, 0xdd59, 0x4339, 0xa5, 0x86, 0x79, 0xba, 0xb1, 0x13, 0xb7, 0x74); static void cxl_event_trace_record(const struct cxl_memdev *cxlmd, enum cxl_event_log_type type, struct cxl_event_record_raw *record) { uuid_t *id = &record->hdr.id; if (uuid_equal(id, &gen_media_event_uuid)) { struct cxl_event_gen_media *rec = (struct cxl_event_gen_media *)record; trace_cxl_general_media(cxlmd, type, rec); } else if (uuid_equal(id, &dram_event_uuid)) { struct cxl_event_dram *rec = (struct cxl_event_dram *)record; trace_cxl_dram(cxlmd, type, rec); } else if (uuid_equal(id, &mem_mod_event_uuid)) { struct cxl_event_mem_module *rec = (struct cxl_event_mem_module *)record; trace_cxl_memory_module(cxlmd, type, rec); } else { /* For unknown record types print just the header */ trace_cxl_generic_event(cxlmd, type, record); } } static int cxl_clear_event_record(struct cxl_dev_state *cxlds, enum cxl_event_log_type log, struct cxl_get_event_payload *get_pl) { struct cxl_mbox_clear_event_payload *payload; u16 total = le16_to_cpu(get_pl->record_count); u8 max_handles = CXL_CLEAR_EVENT_MAX_HANDLES; size_t pl_size = struct_size(payload, handles, max_handles); struct cxl_mbox_cmd mbox_cmd; u16 cnt; int rc = 0; int i; /* Payload size may limit the max handles */ if (pl_size > cxlds->payload_size) { max_handles = (cxlds->payload_size - sizeof(*payload)) / sizeof(__le16); pl_size = struct_size(payload, handles, max_handles); } payload = kvzalloc(pl_size, GFP_KERNEL); if (!payload) return -ENOMEM; *payload = (struct cxl_mbox_clear_event_payload) { .event_log = log, }; mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_CLEAR_EVENT_RECORD, .payload_in = payload, .size_in = pl_size, }; /* * Clear Event Records uses u8 for the handle cnt while Get Event * Record can return up to 0xffff records. */ i = 0; for (cnt = 0; cnt < total; cnt++) { payload->handles[i++] = get_pl->records[cnt].hdr.handle; dev_dbg(cxlds->dev, "Event log '%d': Clearing %u\n", log, le16_to_cpu(payload->handles[i])); if (i == max_handles) { payload->nr_recs = i; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc) goto free_pl; i = 0; } } /* Clear what is left if any */ if (i) { payload->nr_recs = i; mbox_cmd.size_in = struct_size(payload, handles, i); rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc) goto free_pl; } free_pl: kvfree(payload); return rc; } static void cxl_mem_get_records_log(struct cxl_dev_state *cxlds, enum cxl_event_log_type type) { struct cxl_get_event_payload *payload; struct cxl_mbox_cmd mbox_cmd; u8 log_type = type; u16 nr_rec; mutex_lock(&cxlds->event.log_lock); payload = cxlds->event.buf; mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_GET_EVENT_RECORD, .payload_in = &log_type, .size_in = sizeof(log_type), .payload_out = payload, .size_out = cxlds->payload_size, .min_out = struct_size(payload, records, 0), }; do { int rc, i; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc) { dev_err_ratelimited(cxlds->dev, "Event log '%d': Failed to query event records : %d", type, rc); break; } nr_rec = le16_to_cpu(payload->record_count); if (!nr_rec) break; for (i = 0; i < nr_rec; i++) cxl_event_trace_record(cxlds->cxlmd, type, &payload->records[i]); if (payload->flags & CXL_GET_EVENT_FLAG_OVERFLOW) trace_cxl_overflow(cxlds->cxlmd, type, payload); rc = cxl_clear_event_record(cxlds, type, payload); if (rc) { dev_err_ratelimited(cxlds->dev, "Event log '%d': Failed to clear events : %d", type, rc); break; } } while (nr_rec); mutex_unlock(&cxlds->event.log_lock); } /** * cxl_mem_get_event_records - Get Event Records from the device * @cxlds: The device data for the operation * @status: Event Status register value identifying which events are available. * * Retrieve all event records available on the device, report them as trace * events, and clear them. * * See CXL rev 3.0 @8.2.9.2.2 Get Event Records * See CXL rev 3.0 @8.2.9.2.3 Clear Event Records */ void cxl_mem_get_event_records(struct cxl_dev_state *cxlds, u32 status) { dev_dbg(cxlds->dev, "Reading event logs: %x\n", status); if (status & CXLDEV_EVENT_STATUS_FATAL) cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_FATAL); if (status & CXLDEV_EVENT_STATUS_FAIL) cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_FAIL); if (status & CXLDEV_EVENT_STATUS_WARN) cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_WARN); if (status & CXLDEV_EVENT_STATUS_INFO) cxl_mem_get_records_log(cxlds, CXL_EVENT_TYPE_INFO); } EXPORT_SYMBOL_NS_GPL(cxl_mem_get_event_records, CXL); /** * cxl_mem_get_partition_info - Get partition info * @cxlds: The device data for the operation * * Retrieve the current partition info for the device specified. The active * values are the current capacity in bytes. If not 0, the 'next' values are * the pending values, in bytes, which take affect on next cold reset. * * Return: 0 if no error: or the result of the mailbox command. * * See CXL @8.2.9.5.2.1 Get Partition Info */ static int cxl_mem_get_partition_info(struct cxl_dev_state *cxlds) { struct cxl_mbox_get_partition_info pi; struct cxl_mbox_cmd mbox_cmd; int rc; mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_GET_PARTITION_INFO, .size_out = sizeof(pi), .payload_out = &pi, }; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc) return rc; cxlds->active_volatile_bytes = le64_to_cpu(pi.active_volatile_cap) * CXL_CAPACITY_MULTIPLIER; cxlds->active_persistent_bytes = le64_to_cpu(pi.active_persistent_cap) * CXL_CAPACITY_MULTIPLIER; cxlds->next_volatile_bytes = le64_to_cpu(pi.next_volatile_cap) * CXL_CAPACITY_MULTIPLIER; cxlds->next_persistent_bytes = le64_to_cpu(pi.next_volatile_cap) * CXL_CAPACITY_MULTIPLIER; return 0; } /** * cxl_dev_state_identify() - Send the IDENTIFY command to the device. * @cxlds: The device data for the operation * * Return: 0 if identify was executed successfully. * * This will dispatch the identify command to the device and on success populate * structures to be exported to sysfs. */ int cxl_dev_state_identify(struct cxl_dev_state *cxlds) { /* See CXL 2.0 Table 175 Identify Memory Device Output Payload */ struct cxl_mbox_identify id; struct cxl_mbox_cmd mbox_cmd; int rc; mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_IDENTIFY, .size_out = sizeof(id), .payload_out = &id, }; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); if (rc < 0) return rc; cxlds->total_bytes = le64_to_cpu(id.total_capacity) * CXL_CAPACITY_MULTIPLIER; cxlds->volatile_only_bytes = le64_to_cpu(id.volatile_capacity) * CXL_CAPACITY_MULTIPLIER; cxlds->persistent_only_bytes = le64_to_cpu(id.persistent_capacity) * CXL_CAPACITY_MULTIPLIER; cxlds->partition_align_bytes = le64_to_cpu(id.partition_align) * CXL_CAPACITY_MULTIPLIER; cxlds->lsa_size = le32_to_cpu(id.lsa_size); memcpy(cxlds->firmware_version, id.fw_revision, sizeof(id.fw_revision)); return 0; } EXPORT_SYMBOL_NS_GPL(cxl_dev_state_identify, CXL); static int add_dpa_res(struct device *dev, struct resource *parent, struct resource *res, resource_size_t start, resource_size_t size, const char *type) { int rc; res->name = type; res->start = start; res->end = start + size - 1; res->flags = IORESOURCE_MEM; if (resource_size(res) == 0) { dev_dbg(dev, "DPA(%s): no capacity\n", res->name); return 0; } rc = request_resource(parent, res); if (rc) { dev_err(dev, "DPA(%s): failed to track %pr (%d)\n", res->name, res, rc); return rc; } dev_dbg(dev, "DPA(%s): %pr\n", res->name, res); return 0; } int cxl_mem_create_range_info(struct cxl_dev_state *cxlds) { struct device *dev = cxlds->dev; int rc; cxlds->dpa_res = (struct resource)DEFINE_RES_MEM(0, cxlds->total_bytes); if (cxlds->partition_align_bytes == 0) { rc = add_dpa_res(dev, &cxlds->dpa_res, &cxlds->ram_res, 0, cxlds->volatile_only_bytes, "ram"); if (rc) return rc; return add_dpa_res(dev, &cxlds->dpa_res, &cxlds->pmem_res, cxlds->volatile_only_bytes, cxlds->persistent_only_bytes, "pmem"); } rc = cxl_mem_get_partition_info(cxlds); if (rc) { dev_err(dev, "Failed to query partition information\n"); return rc; } rc = add_dpa_res(dev, &cxlds->dpa_res, &cxlds->ram_res, 0, cxlds->active_volatile_bytes, "ram"); if (rc) return rc; return add_dpa_res(dev, &cxlds->dpa_res, &cxlds->pmem_res, cxlds->active_volatile_bytes, cxlds->active_persistent_bytes, "pmem"); } EXPORT_SYMBOL_NS_GPL(cxl_mem_create_range_info, CXL); int cxl_set_timestamp(struct cxl_dev_state *cxlds) { struct cxl_mbox_cmd mbox_cmd; struct cxl_mbox_set_timestamp_in pi; int rc; pi.timestamp = cpu_to_le64(ktime_get_real_ns()); mbox_cmd = (struct cxl_mbox_cmd) { .opcode = CXL_MBOX_OP_SET_TIMESTAMP, .size_in = sizeof(pi), .payload_in = &pi, }; rc = cxl_internal_send_cmd(cxlds, &mbox_cmd); /* * Command is optional. Devices may have another way of providing * a timestamp, or may return all 0s in timestamp fields. * Don't report an error if this command isn't supported */ if (rc && (mbox_cmd.return_code != CXL_MBOX_CMD_RC_UNSUPPORTED)) return rc; return 0; } EXPORT_SYMBOL_NS_GPL(cxl_set_timestamp, CXL); struct cxl_dev_state *cxl_dev_state_create(struct device *dev) { struct cxl_dev_state *cxlds; cxlds = devm_kzalloc(dev, sizeof(*cxlds), GFP_KERNEL); if (!cxlds) { dev_err(dev, "No memory available\n"); return ERR_PTR(-ENOMEM); } mutex_init(&cxlds->mbox_mutex); mutex_init(&cxlds->event.log_lock); cxlds->dev = dev; return cxlds; } EXPORT_SYMBOL_NS_GPL(cxl_dev_state_create, CXL); void __init cxl_mbox_init(void) { struct dentry *mbox_debugfs; mbox_debugfs = cxl_debugfs_create_dir("mbox"); debugfs_create_bool("raw_allow_all", 0600, mbox_debugfs, &cxl_raw_allow_all); }
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