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/*
* CXL Utility library for mailbox interface
*
* Copyright(C) 2020 Intel Corporation.
*
* This work is licensed under the terms of the GNU GPL, version 2. See the
* COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "hw/cxl/cxl.h"
#include "hw/pci/pci.h"
#include "qemu/log.h"
#include "qemu/uuid.h"
/*
* How to add a new command, example. The command set FOO, with cmd BAR.
* 1. Add the command set and cmd to the enum.
* FOO = 0x7f,
* #define BAR 0
* 2. Implement the handler
* static ret_code cmd_foo_bar(struct cxl_cmd *cmd,
* CXLDeviceState *cxl_dstate, uint16_t *len)
* 3. Add the command to the cxl_cmd_set[][]
* [FOO][BAR] = { "FOO_BAR", cmd_foo_bar, x, y },
* 4. Implement your handler
* define_mailbox_handler(FOO_BAR) { ... return CXL_MBOX_SUCCESS; }
*
*
* Writing the handler:
* The handler will provide the &struct cxl_cmd, the &CXLDeviceState, and the
* in/out length of the payload. The handler is responsible for consuming the
* payload from cmd->payload and operating upon it as necessary. It must then
* fill the output data into cmd->payload (overwriting what was there),
* setting the length, and returning a valid return code.
*
* XXX: The handler need not worry about endianess. The payload is read out of
* a register interface that already deals with it.
*/
enum {
EVENTS = 0x01,
#define GET_RECORDS 0x0
#define CLEAR_RECORDS 0x1
#define GET_INTERRUPT_POLICY 0x2
#define SET_INTERRUPT_POLICY 0x3
TIMESTAMP = 0x03,
#define GET 0x0
#define SET 0x1
};
/* 8.2.8.4.5.1 Command Return Codes */
typedef enum {
CXL_MBOX_SUCCESS = 0x0,
CXL_MBOX_BG_STARTED = 0x1,
CXL_MBOX_INVALID_INPUT = 0x2,
CXL_MBOX_UNSUPPORTED = 0x3,
CXL_MBOX_INTERNAL_ERROR = 0x4,
CXL_MBOX_RETRY_REQUIRED = 0x5,
CXL_MBOX_BUSY = 0x6,
CXL_MBOX_MEDIA_DISABLED = 0x7,
CXL_MBOX_FW_XFER_IN_PROGRESS = 0x8,
CXL_MBOX_FW_XFER_OUT_OF_ORDER = 0x9,
CXL_MBOX_FW_AUTH_FAILED = 0xa,
CXL_MBOX_FW_INVALID_SLOT = 0xb,
CXL_MBOX_FW_ROLLEDBACK = 0xc,
CXL_MBOX_FW_REST_REQD = 0xd,
CXL_MBOX_INVALID_HANDLE = 0xe,
CXL_MBOX_INVALID_PA = 0xf,
CXL_MBOX_INJECT_POISON_LIMIT = 0x10,
CXL_MBOX_PERMANENT_MEDIA_FAILURE = 0x11,
CXL_MBOX_ABORTED = 0x12,
CXL_MBOX_INVALID_SECURITY_STATE = 0x13,
CXL_MBOX_INCORRECT_PASSPHRASE = 0x14,
CXL_MBOX_UNSUPPORTED_MAILBOX = 0x15,
CXL_MBOX_INVALID_PAYLOAD_LENGTH = 0x16,
CXL_MBOX_MAX = 0x17
} ret_code;
struct cxl_cmd;
typedef ret_code (*opcode_handler)(struct cxl_cmd *cmd,
CXLDeviceState *cxl_dstate, uint16_t *len);
struct cxl_cmd {
const char *name;
opcode_handler handler;
ssize_t in;
uint16_t effect; /* Reported in CEL */
uint8_t *payload;
};
#define DEFINE_MAILBOX_HANDLER_ZEROED(name, size) \
uint16_t __zero##name = size; \
static ret_code cmd_##name(struct cxl_cmd *cmd, \
CXLDeviceState *cxl_dstate, uint16_t *len) \
{ \
*len = __zero##name; \
memset(cmd->payload, 0, *len); \
return CXL_MBOX_SUCCESS; \
}
#define DEFINE_MAILBOX_HANDLER_NOP(name) \
static ret_code cmd_##name(struct cxl_cmd *cmd, \
CXLDeviceState *cxl_dstate, uint16_t *len) \
{ \
return CXL_MBOX_SUCCESS; \
}
DEFINE_MAILBOX_HANDLER_ZEROED(events_get_records, 0x20);
DEFINE_MAILBOX_HANDLER_NOP(events_clear_records);
DEFINE_MAILBOX_HANDLER_ZEROED(events_get_interrupt_policy, 4);
DEFINE_MAILBOX_HANDLER_NOP(events_set_interrupt_policy);
/* 8.2.9.3.1 */
static ret_code cmd_timestamp_get(struct cxl_cmd *cmd,
CXLDeviceState *cxl_dstate,
uint16_t *len)
{
uint64_t time, delta;
uint64_t final_time = 0;
if (cxl_dstate->timestamp.set) {
/* First find the delta from the last time the host set the time. */
time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
delta = time - cxl_dstate->timestamp.last_set;
final_time = cxl_dstate->timestamp.host_set + delta;
}
/* Then adjust the actual time */
stq_le_p(cmd->payload, final_time);
*len = 8;
return CXL_MBOX_SUCCESS;
}
/* 8.2.9.3.2 */
static ret_code cmd_timestamp_set(struct cxl_cmd *cmd,
CXLDeviceState *cxl_dstate,
uint16_t *len)
{
cxl_dstate->timestamp.set = true;
cxl_dstate->timestamp.last_set = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
cxl_dstate->timestamp.host_set = le64_to_cpu(*(uint64_t *)cmd->payload);
*len = 0;
return CXL_MBOX_SUCCESS;
}
static QemuUUID cel_uuid;
#define IMMEDIATE_CONFIG_CHANGE (1 << 1)
#define IMMEDIATE_POLICY_CHANGE (1 << 3)
#define IMMEDIATE_LOG_CHANGE (1 << 4)
static struct cxl_cmd cxl_cmd_set[256][256] = {
[EVENTS][GET_RECORDS] = { "EVENTS_GET_RECORDS",
cmd_events_get_records, 1, 0 },
[EVENTS][CLEAR_RECORDS] = { "EVENTS_CLEAR_RECORDS",
cmd_events_clear_records, ~0, IMMEDIATE_LOG_CHANGE },
[EVENTS][GET_INTERRUPT_POLICY] = { "EVENTS_GET_INTERRUPT_POLICY",
cmd_events_get_interrupt_policy, 0, 0 },
[EVENTS][SET_INTERRUPT_POLICY] = { "EVENTS_SET_INTERRUPT_POLICY",
cmd_events_set_interrupt_policy, 4, IMMEDIATE_CONFIG_CHANGE },
[TIMESTAMP][GET] = { "TIMESTAMP_GET", cmd_timestamp_get, 0, 0 },
[TIMESTAMP][SET] = { "TIMESTAMP_SET", cmd_timestamp_set, 8, IMMEDIATE_POLICY_CHANGE },
};
void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
{
uint16_t ret = CXL_MBOX_SUCCESS;
struct cxl_cmd *cxl_cmd;
uint64_t status_reg;
opcode_handler h;
uint64_t command_reg = cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_CMD];
uint8_t set = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND_SET);
uint8_t cmd = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND);
uint16_t len = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, LENGTH);
cxl_cmd = &cxl_cmd_set[set][cmd];
h = cxl_cmd->handler;
if (h) {
if (len == cxl_cmd->in) {
cxl_cmd->payload = cxl_dstate->mbox_reg_state +
A_CXL_DEV_CMD_PAYLOAD;
ret = (*h)(cxl_cmd, cxl_dstate, &len);
assert(len <= cxl_dstate->payload_size);
} else {
ret = CXL_MBOX_INVALID_PAYLOAD_LENGTH;
}
} else {
qemu_log_mask(LOG_UNIMP, "Command %04xh not implemented\n",
set << 8 | cmd);
ret = CXL_MBOX_UNSUPPORTED;
}
/* Set the return code */
status_reg = FIELD_DP64(0, CXL_DEV_MAILBOX_STS, ERRNO, ret);
/* Set the return length */
command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND_SET, 0);
command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND, 0);
command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD, LENGTH, len);
cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_CMD] = command_reg;
cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_STS] = status_reg;
/* Tell the host we're done */
ARRAY_FIELD_DP32(cxl_dstate->mbox_reg_state32, CXL_DEV_MAILBOX_CTRL,
DOORBELL, 0);
}
int cxl_initialize_mailbox(CXLDeviceState *cxl_dstate)
{
/* CXL 2.0: Table 169 Get Supported Logs Log Entry */
const char *cel_uuidstr = "0da9c0b5-bf41-4b78-8f79-96b1623b3f17";
for (int set = 0; set < 256; set++) {
for (int cmd = 0; cmd < 256; cmd++) {
if (cxl_cmd_set[set][cmd].handler) {
struct cxl_cmd *c = &cxl_cmd_set[set][cmd];
struct cel_log *log =
&cxl_dstate->cel_log[cxl_dstate->cel_size];
log->opcode = (set << 8) | cmd;
log->effect = c->effect;
cxl_dstate->cel_size++;
}
}
}
return qemu_uuid_parse(cel_uuidstr, &cel_uuid);
}
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