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// 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/mutex.h>
#include <cxlmem.h>
#include <cxl.h>
#include "core.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, \
}
/*
* 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, ~0, ~0, 0),
#endif
CXL_CMD(GET_SUPPORTED_LOGS, 0, ~0, 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, ~0, 0),
CXL_CMD(GET_HEALTH_INFO, 0, 0x12, 0),
CXL_CMD(GET_LOG, 0x18, ~0, CXL_CMD_FLAG_FORCE_ENABLE),
CXL_CMD(SET_PARTITION_INFO, 0x0a, 0, 0),
CXL_CMD(SET_LSA, ~0, 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, ~0, 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, ~0, 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;
}
/**
* cxl_mbox_send_cmd() - Send a mailbox command to a device.
* @cxlds: The device data for the operation
* @opcode: Opcode for the mailbox command.
* @in: The input payload for the mailbox command.
* @in_size: The length of the input payload
* @out: Caller allocated buffer for the output.
* @out_size: Expected size of output.
*
* Context: Any context. Will acquire and release mbox_mutex.
* 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_mbox_send_cmd(struct cxl_dev_state *cxlds, u16 opcode, void *in,
size_t in_size, void *out, size_t out_size)
{
const struct cxl_mem_command *cmd = cxl_mem_find_command(opcode);
struct cxl_mbox_cmd mbox_cmd = {
.opcode = opcode,
.payload_in = in,
.size_in = in_size,
.size_out = out_size,
.payload_out = out,
};
int rc;
if (out_size > cxlds->payload_size)
return -E2BIG;
rc = cxlds->mbox_send(cxlds, &mbox_cmd);
if (rc)
return rc;
/* TODO: Map return code to proper kernel style errno */
if (mbox_cmd.return_code != CXL_MBOX_SUCCESS)
return -ENXIO;
/*
* Variable sized commands can't be validated and so it's up to the
* caller to do that if they wish.
*/
if (cmd->info.size_out >= 0 && mbox_cmd.size_out != out_size)
return -EIO;
return 0;
}
EXPORT_SYMBOL_NS_GPL(cxl_mbox_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_validate_cmd_from_user() - Check fields for CXL_MEM_SEND_COMMAND.
* @cxlds: The device data for the operation
* @send_cmd: &struct cxl_send_command copied in from userspace.
* @out_cmd: Sanitized and populated &struct cxl_mem_command.
*
* 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 @out_cmd that is
* safe to send to the hardware.
*
* See handle_mailbox_cmd_from_user()
*/
static int cxl_validate_cmd_from_user(struct cxl_dev_state *cxlds,
const struct cxl_send_command *send_cmd,
struct cxl_mem_command *out_cmd)
{
const struct cxl_command_info *info;
struct cxl_mem_command *c;
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;
/*
* Checks are bypassed for raw commands but a WARN/taint will occur
* later in the callchain
*/
if (send_cmd->id == CXL_MEM_COMMAND_ID_RAW) {
const struct cxl_mem_command temp = {
.info = {
.id = CXL_MEM_COMMAND_ID_RAW,
.flags = 0,
.size_in = send_cmd->in.size,
.size_out = send_cmd->out.size,
},
.opcode = send_cmd->raw.opcode
};
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;
memcpy(out_cmd, &temp, sizeof(temp));
return 0;
}
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;
/* Convert user's command into the internal representation */
c = &cxl_mem_commands[send_cmd->id];
info = &c->info;
/* 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 >= 0 && info->size_in != send_cmd->in.size)
return -ENOMEM;
/* Check the output buffer is at least large enough */
if (info->size_out >= 0 && send_cmd->out.size < info->size_out)
return -ENOMEM;
memcpy(out_cmd, c, sizeof(*c));
out_cmd->info.size_in = send_cmd->in.size;
/*
* XXX: out_cmd->info.size_out will be controlled by the driver, and the
* specified number of bytes @send_cmd->out.size will be copied back out
* to userspace.
*/
return 0;
}
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) {
const struct cxl_command_info *info = &cmd->info;
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
* @cmd: The validated command.
* @in_payload: Pointer to userspace's input payload.
* @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.
*
* Creates the appropriate mailbox command and dispatches it on behalf of a
* userspace request. The input and output payloads are copied between
* userspace.
*
* See cxl_send_cmd().
*/
static int handle_mailbox_cmd_from_user(struct cxl_dev_state *cxlds,
const struct cxl_mem_command *cmd,
u64 in_payload, u64 out_payload,
s32 *size_out, u32 *retval)
{
struct device *dev = cxlds->dev;
struct cxl_mbox_cmd mbox_cmd = {
.opcode = cmd->opcode,
.size_in = cmd->info.size_in,
.size_out = cmd->info.size_out,
};
int rc;
if (cmd->info.size_out) {
mbox_cmd.payload_out = kvzalloc(cmd->info.size_out, GFP_KERNEL);
if (!mbox_cmd.payload_out)
return -ENOMEM;
}
if (cmd->info.size_in) {
mbox_cmd.payload_in = vmemdup_user(u64_to_user_ptr(in_payload),
cmd->info.size_in);
if (IS_ERR(mbox_cmd.payload_in)) {
kvfree(mbox_cmd.payload_out);
return PTR_ERR(mbox_cmd.payload_in);
}
}
dev_dbg(dev,
"Submitting %s command for user\n"
"\topcode: %x\n"
"\tsize: %ub\n",
cxl_command_names[cmd->info.id].name, mbox_cmd.opcode,
cmd->info.size_in);
dev_WARN_ONCE(dev, cmd->info.id == CXL_MEM_COMMAND_ID_RAW,
"raw command path used\n");
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:
kvfree(mbox_cmd.payload_in);
kvfree(mbox_cmd.payload_out);
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_mem_command c;
int rc;
dev_dbg(dev, "Send IOCTL\n");
if (copy_from_user(&send, s, sizeof(send)))
return -EFAULT;
rc = cxl_validate_cmd_from_user(cxlmd->cxlds, &send, &c);
if (rc)
return rc;
/* Prepare to handle a full payload for variable sized output */
if (c.info.size_out < 0)
c.info.size_out = cxlds->payload_size;
rc = handle_mailbox_cmd_from_user(cxlds, &c, send.in.payload,
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_get_log log = {
.uuid = *uuid,
.offset = cpu_to_le32(offset),
.length = cpu_to_le32(xfer_size)
};
int rc;
rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_LOG, &log, sizeof(log),
out, xfer_size);
if (rc < 0)
return rc;
out += xfer_size;
remaining -= xfer_size;
offset += xfer_size;
}
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", opcode);
continue;
}
set_bit(cmd->info.id, cxlds->enabled_cmds);
}
}
static struct cxl_mbox_get_supported_logs *cxl_get_gsl(struct cxl_dev_state *cxlds)
{
struct cxl_mbox_get_supported_logs *ret;
int rc;
ret = kvmalloc(cxlds->payload_size, GFP_KERNEL);
if (!ret)
return ERR_PTR(-ENOMEM);
rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_SUPPORTED_LOGS, NULL, 0, ret,
cxlds->payload_size);
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);
/**
* 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 {
__le64 active_volatile_cap;
__le64 active_persistent_cap;
__le64 next_volatile_cap;
__le64 next_persistent_cap;
} __packed pi;
int rc;
rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_GET_PARTITION_INFO, NULL, 0,
&pi, sizeof(pi));
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;
int rc;
rc = cxl_mbox_send_cmd(cxlds, CXL_MBOX_OP_IDENTIFY, NULL, 0, &id,
sizeof(id));
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;
dev_dbg(cxlds->dev,
"Identify Memory Device\n"
" total_bytes = %#llx\n"
" volatile_only_bytes = %#llx\n"
" persistent_only_bytes = %#llx\n"
" partition_align_bytes = %#llx\n",
cxlds->total_bytes, cxlds->volatile_only_bytes,
cxlds->persistent_only_bytes, cxlds->partition_align_bytes);
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);
int cxl_mem_create_range_info(struct cxl_dev_state *cxlds)
{
int rc;
if (cxlds->partition_align_bytes == 0) {
cxlds->ram_range.start = 0;
cxlds->ram_range.end = cxlds->volatile_only_bytes - 1;
cxlds->pmem_range.start = cxlds->volatile_only_bytes;
cxlds->pmem_range.end = cxlds->volatile_only_bytes +
cxlds->persistent_only_bytes - 1;
return 0;
}
rc = cxl_mem_get_partition_info(cxlds);
if (rc) {
dev_err(cxlds->dev, "Failed to query partition information\n");
return rc;
}
dev_dbg(cxlds->dev,
"Get Partition Info\n"
" active_volatile_bytes = %#llx\n"
" active_persistent_bytes = %#llx\n"
" next_volatile_bytes = %#llx\n"
" next_persistent_bytes = %#llx\n",
cxlds->active_volatile_bytes, cxlds->active_persistent_bytes,
cxlds->next_volatile_bytes, cxlds->next_persistent_bytes);
cxlds->ram_range.start = 0;
cxlds->ram_range.end = cxlds->active_volatile_bytes - 1;
cxlds->pmem_range.start = cxlds->active_volatile_bytes;
cxlds->pmem_range.end =
cxlds->active_volatile_bytes + cxlds->active_persistent_bytes - 1;
return 0;
}
EXPORT_SYMBOL_NS_GPL(cxl_mem_create_range_info, 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);
cxlds->dev = dev;
return cxlds;
}
EXPORT_SYMBOL_NS_GPL(cxl_dev_state_create, CXL);
static struct dentry *cxl_debugfs;
void __init cxl_mbox_init(void)
{
struct dentry *mbox_debugfs;
cxl_debugfs = debugfs_create_dir("cxl", NULL);
mbox_debugfs = debugfs_create_dir("mbox", cxl_debugfs);
debugfs_create_bool("raw_allow_all", 0600, mbox_debugfs,
&cxl_raw_allow_all);
}
void cxl_mbox_exit(void)
{
debugfs_remove_recursive(cxl_debugfs);
}