557a79c83e
Errata F4 to CXL 2.0 clarified the meaning of the timer as the sum of the value set with the timestamp set command and the number of nano seconds since it was last set. Signed-off-by: Ben Widawsky <ben.widawsky@intel.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Message-Id: <20220429144110.25167-10-Jonathan.Cameron@huawei.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
232 lines
8.2 KiB
C
232 lines
8.2 KiB
C
/*
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* CXL Utility library for mailbox interface
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*
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* Copyright(C) 2020 Intel Corporation.
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See the
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* COPYING file in the top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "hw/cxl/cxl.h"
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#include "hw/pci/pci.h"
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#include "qemu/log.h"
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#include "qemu/uuid.h"
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/*
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* How to add a new command, example. The command set FOO, with cmd BAR.
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* 1. Add the command set and cmd to the enum.
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* FOO = 0x7f,
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* #define BAR 0
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* 2. Implement the handler
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* static ret_code cmd_foo_bar(struct cxl_cmd *cmd,
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* CXLDeviceState *cxl_dstate, uint16_t *len)
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* 3. Add the command to the cxl_cmd_set[][]
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* [FOO][BAR] = { "FOO_BAR", cmd_foo_bar, x, y },
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* 4. Implement your handler
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* define_mailbox_handler(FOO_BAR) { ... return CXL_MBOX_SUCCESS; }
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*
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*
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* Writing the handler:
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* The handler will provide the &struct cxl_cmd, the &CXLDeviceState, and the
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* in/out length of the payload. The handler is responsible for consuming the
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* payload from cmd->payload and operating upon it as necessary. It must then
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* fill the output data into cmd->payload (overwriting what was there),
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* setting the length, and returning a valid return code.
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*
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* XXX: The handler need not worry about endianess. The payload is read out of
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* a register interface that already deals with it.
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*/
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enum {
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EVENTS = 0x01,
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#define GET_RECORDS 0x0
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#define CLEAR_RECORDS 0x1
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#define GET_INTERRUPT_POLICY 0x2
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#define SET_INTERRUPT_POLICY 0x3
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TIMESTAMP = 0x03,
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#define GET 0x0
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#define SET 0x1
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};
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/* 8.2.8.4.5.1 Command Return Codes */
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typedef enum {
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CXL_MBOX_SUCCESS = 0x0,
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CXL_MBOX_BG_STARTED = 0x1,
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CXL_MBOX_INVALID_INPUT = 0x2,
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CXL_MBOX_UNSUPPORTED = 0x3,
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CXL_MBOX_INTERNAL_ERROR = 0x4,
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CXL_MBOX_RETRY_REQUIRED = 0x5,
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CXL_MBOX_BUSY = 0x6,
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CXL_MBOX_MEDIA_DISABLED = 0x7,
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CXL_MBOX_FW_XFER_IN_PROGRESS = 0x8,
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CXL_MBOX_FW_XFER_OUT_OF_ORDER = 0x9,
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CXL_MBOX_FW_AUTH_FAILED = 0xa,
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CXL_MBOX_FW_INVALID_SLOT = 0xb,
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CXL_MBOX_FW_ROLLEDBACK = 0xc,
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CXL_MBOX_FW_REST_REQD = 0xd,
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CXL_MBOX_INVALID_HANDLE = 0xe,
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CXL_MBOX_INVALID_PA = 0xf,
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CXL_MBOX_INJECT_POISON_LIMIT = 0x10,
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CXL_MBOX_PERMANENT_MEDIA_FAILURE = 0x11,
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CXL_MBOX_ABORTED = 0x12,
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CXL_MBOX_INVALID_SECURITY_STATE = 0x13,
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CXL_MBOX_INCORRECT_PASSPHRASE = 0x14,
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CXL_MBOX_UNSUPPORTED_MAILBOX = 0x15,
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CXL_MBOX_INVALID_PAYLOAD_LENGTH = 0x16,
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CXL_MBOX_MAX = 0x17
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} ret_code;
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struct cxl_cmd;
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typedef ret_code (*opcode_handler)(struct cxl_cmd *cmd,
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CXLDeviceState *cxl_dstate, uint16_t *len);
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struct cxl_cmd {
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const char *name;
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opcode_handler handler;
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ssize_t in;
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uint16_t effect; /* Reported in CEL */
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uint8_t *payload;
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};
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#define DEFINE_MAILBOX_HANDLER_ZEROED(name, size) \
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uint16_t __zero##name = size; \
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static ret_code cmd_##name(struct cxl_cmd *cmd, \
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CXLDeviceState *cxl_dstate, uint16_t *len) \
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{ \
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*len = __zero##name; \
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memset(cmd->payload, 0, *len); \
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return CXL_MBOX_SUCCESS; \
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}
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#define DEFINE_MAILBOX_HANDLER_NOP(name) \
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static ret_code cmd_##name(struct cxl_cmd *cmd, \
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CXLDeviceState *cxl_dstate, uint16_t *len) \
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{ \
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return CXL_MBOX_SUCCESS; \
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}
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DEFINE_MAILBOX_HANDLER_ZEROED(events_get_records, 0x20);
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DEFINE_MAILBOX_HANDLER_NOP(events_clear_records);
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DEFINE_MAILBOX_HANDLER_ZEROED(events_get_interrupt_policy, 4);
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DEFINE_MAILBOX_HANDLER_NOP(events_set_interrupt_policy);
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/* 8.2.9.3.1 */
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static ret_code cmd_timestamp_get(struct cxl_cmd *cmd,
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CXLDeviceState *cxl_dstate,
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uint16_t *len)
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{
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uint64_t time, delta;
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uint64_t final_time = 0;
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if (cxl_dstate->timestamp.set) {
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/* First find the delta from the last time the host set the time. */
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time = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
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delta = time - cxl_dstate->timestamp.last_set;
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final_time = cxl_dstate->timestamp.host_set + delta;
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}
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/* Then adjust the actual time */
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stq_le_p(cmd->payload, final_time);
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*len = 8;
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return CXL_MBOX_SUCCESS;
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}
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/* 8.2.9.3.2 */
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static ret_code cmd_timestamp_set(struct cxl_cmd *cmd,
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CXLDeviceState *cxl_dstate,
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uint16_t *len)
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{
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cxl_dstate->timestamp.set = true;
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cxl_dstate->timestamp.last_set = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
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cxl_dstate->timestamp.host_set = le64_to_cpu(*(uint64_t *)cmd->payload);
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*len = 0;
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return CXL_MBOX_SUCCESS;
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}
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static QemuUUID cel_uuid;
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#define IMMEDIATE_CONFIG_CHANGE (1 << 1)
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#define IMMEDIATE_POLICY_CHANGE (1 << 3)
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#define IMMEDIATE_LOG_CHANGE (1 << 4)
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static struct cxl_cmd cxl_cmd_set[256][256] = {
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[EVENTS][GET_RECORDS] = { "EVENTS_GET_RECORDS",
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cmd_events_get_records, 1, 0 },
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[EVENTS][CLEAR_RECORDS] = { "EVENTS_CLEAR_RECORDS",
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cmd_events_clear_records, ~0, IMMEDIATE_LOG_CHANGE },
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[EVENTS][GET_INTERRUPT_POLICY] = { "EVENTS_GET_INTERRUPT_POLICY",
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cmd_events_get_interrupt_policy, 0, 0 },
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[EVENTS][SET_INTERRUPT_POLICY] = { "EVENTS_SET_INTERRUPT_POLICY",
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cmd_events_set_interrupt_policy, 4, IMMEDIATE_CONFIG_CHANGE },
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[TIMESTAMP][GET] = { "TIMESTAMP_GET", cmd_timestamp_get, 0, 0 },
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[TIMESTAMP][SET] = { "TIMESTAMP_SET", cmd_timestamp_set, 8, IMMEDIATE_POLICY_CHANGE },
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};
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void cxl_process_mailbox(CXLDeviceState *cxl_dstate)
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{
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uint16_t ret = CXL_MBOX_SUCCESS;
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struct cxl_cmd *cxl_cmd;
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uint64_t status_reg;
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opcode_handler h;
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uint64_t command_reg = cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_CMD];
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uint8_t set = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND_SET);
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uint8_t cmd = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND);
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uint16_t len = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, LENGTH);
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cxl_cmd = &cxl_cmd_set[set][cmd];
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h = cxl_cmd->handler;
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if (h) {
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if (len == cxl_cmd->in) {
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cxl_cmd->payload = cxl_dstate->mbox_reg_state +
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A_CXL_DEV_CMD_PAYLOAD;
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ret = (*h)(cxl_cmd, cxl_dstate, &len);
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assert(len <= cxl_dstate->payload_size);
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} else {
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ret = CXL_MBOX_INVALID_PAYLOAD_LENGTH;
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}
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} else {
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qemu_log_mask(LOG_UNIMP, "Command %04xh not implemented\n",
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set << 8 | cmd);
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ret = CXL_MBOX_UNSUPPORTED;
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}
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/* Set the return code */
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status_reg = FIELD_DP64(0, CXL_DEV_MAILBOX_STS, ERRNO, ret);
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/* Set the return length */
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command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND_SET, 0);
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command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND, 0);
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command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD, LENGTH, len);
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cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_CMD] = command_reg;
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cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_STS] = status_reg;
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/* Tell the host we're done */
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ARRAY_FIELD_DP32(cxl_dstate->mbox_reg_state32, CXL_DEV_MAILBOX_CTRL,
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DOORBELL, 0);
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}
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int cxl_initialize_mailbox(CXLDeviceState *cxl_dstate)
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{
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/* CXL 2.0: Table 169 Get Supported Logs Log Entry */
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const char *cel_uuidstr = "0da9c0b5-bf41-4b78-8f79-96b1623b3f17";
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for (int set = 0; set < 256; set++) {
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for (int cmd = 0; cmd < 256; cmd++) {
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if (cxl_cmd_set[set][cmd].handler) {
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struct cxl_cmd *c = &cxl_cmd_set[set][cmd];
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struct cel_log *log =
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&cxl_dstate->cel_log[cxl_dstate->cel_size];
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log->opcode = (set << 8) | cmd;
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log->effect = c->effect;
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cxl_dstate->cel_size++;
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}
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}
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}
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return qemu_uuid_parse(cel_uuidstr, &cel_uuid);
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}
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