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hw/cxl/mbox: Generalize the CCI command processing

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By moving the parts of the mailbox command handling that are CCI type
specific out to the caller, make the main handling code generic. Rename it
to cxl_process_cci_message() to reflect this new generality.

Change the type3 mailbox handling (reused shortly for the switch
mailbox CCI) to take a snapshot of the mailbox input data rather
than operating on it in place.  This reduces the chance of bugs
due to aliasing going forwars.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

Message-Id: <20231023160806.13206-5-Jonathan.Cameron@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jonathan Cameron 2023-10-23 17:07:53 +01:00 • committed by Michael S. Tsirkin
parent cac36a8faf
commit c9460561ed
3 changed files with 57 additions and 43 deletions
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44
hw/cxl/cxl-device-utils.c
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@ -157,7 +157,49 @@ static void mailbox_reg_write(void *opaque, hwaddr offset, uint64_t value,
if (ARRAY_FIELD_EX32(cxl_dstate->mbox_reg_state32, CXL_DEV_MAILBOX_CTRL,
DOORBELL)) {
cxl_process_mailbox(cci);
uint64_t command_reg =
cxl_dstate->mbox_reg_state64[R_CXL_DEV_MAILBOX_CMD];
uint8_t cmd_set = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD,
COMMAND_SET);
uint8_t cmd = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, COMMAND);
size_t len_in = FIELD_EX64(command_reg, CXL_DEV_MAILBOX_CMD, LENGTH);
uint8_t *pl = cxl_dstate->mbox_reg_state + A_CXL_DEV_CMD_PAYLOAD;
/*
* Copy taken to avoid need for individual command handlers to care
* about aliasing.
*/
g_autofree uint8_t *pl_in_copy = NULL;
size_t len_out = 0;
uint64_t status_reg;
bool bg_started = false;
int rc;
pl_in_copy = g_memdup2(pl, len_in);
if (len_in == 0 || pl_in_copy) {
/* Avoid stale data - including from earlier cmds */
memset(pl, 0, CXL_MAILBOX_MAX_PAYLOAD_SIZE);
rc = cxl_process_cci_message(cci, cmd_set, cmd, len_in, pl_in_copy,
&len_out, pl, &bg_started);
} else {
rc = CXL_MBOX_INTERNAL_ERROR;
}
/* Set bg and the return code */
status_reg = FIELD_DP64(0, CXL_DEV_MAILBOX_STS, BG_OP,
bg_started ? 1 : 0);
status_reg = FIELD_DP64(status_reg, CXL_DEV_MAILBOX_STS, ERRNO, rc);
/* Set the return length */
command_reg = FIELD_DP64(0, CXL_DEV_MAILBOX_CMD, COMMAND_SET, cmd_set);
command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD,
COMMAND, cmd);
command_reg = FIELD_DP64(command_reg, CXL_DEV_MAILBOX_CMD,
LENGTH, len_out);
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);
}
}