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hw/cxl: Support get/set mctp response payload size

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Add Get/Set Response Message Limit commands.

Signed-off-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Fan Ni <fan.ni@samsung.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Message-Id: <20250305092501.191929-3-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:
Davidlohr Bueso 2025-03-05 09:24:53 +00:00 • committed by Michael S. Tsirkin
parent 98cbac128f
commit 1000158f03
1 changed files with 56 additions and 2 deletions
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58
hw/cxl/cxl-mailbox-utils.c
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@ -7,6 +7,8 @@
* COPYING file in the top-level directory.
*/
#include <math.h>
#include "qemu/osdep.h"
#include "hw/pci/msi.h"
#include "hw/pci/msix.h"
@ -56,6 +58,8 @@ enum {
INFOSTAT = 0x00,
#define IS_IDENTIFY 0x1
#define BACKGROUND_OPERATION_STATUS 0x2
#define GET_RESPONSE_MSG_LIMIT 0x3
#define SET_RESPONSE_MSG_LIMIT 0x4
#define BACKGROUND_OPERATION_ABORT 0x5
EVENTS = 0x01,
#define GET_RECORDS 0x0
@ -413,12 +417,58 @@ static CXLRetCode cmd_infostat_identify(const struct cxl_cmd *cmd,
is_identify->component_type = 0x3; /* Type 3 */
}
/* TODO: Allow this to vary across different CCIs */
is_identify->max_message_size = 9; /* 512 bytes - MCTP_CXL_MAILBOX_BYTES */
is_identify->max_message_size = (uint8_t)log2(cci->payload_max);
*len_out = sizeof(*is_identify);
return CXL_MBOX_SUCCESS;
}
/* CXL r3.1 section 8.2.9.1.3: Get Response Message Limit (Opcode 0003h) */
static CXLRetCode cmd_get_response_msg_limit(const struct cxl_cmd *cmd,
uint8_t *payload_in,
size_t len_in,
uint8_t *payload_out,
size_t *len_out,
CXLCCI *cci)
{
struct {
uint8_t rsp_limit;
} QEMU_PACKED *get_rsp_msg_limit = (void *)payload_out;
QEMU_BUILD_BUG_ON(sizeof(*get_rsp_msg_limit) != 1);
get_rsp_msg_limit->rsp_limit = (uint8_t)log2(cci->payload_max);
*len_out = sizeof(*get_rsp_msg_limit);
return CXL_MBOX_SUCCESS;
}
/* CXL r3.1 section 8.2.9.1.4: Set Response Message Limit (Opcode 0004h) */
static CXLRetCode cmd_set_response_msg_limit(const struct cxl_cmd *cmd,
uint8_t *payload_in,
size_t len_in,
uint8_t *payload_out,
size_t *len_out,
CXLCCI *cci)
{
struct {
uint8_t rsp_limit;
} QEMU_PACKED *in = (void *)payload_in;
QEMU_BUILD_BUG_ON(sizeof(*in) != 1);
struct {
uint8_t rsp_limit;
} QEMU_PACKED *out = (void *)payload_out;
QEMU_BUILD_BUG_ON(sizeof(*out) != 1);
if (in->rsp_limit < 8 || in->rsp_limit > 10) {
return CXL_MBOX_INVALID_INPUT;
}
cci->payload_max = 1 << in->rsp_limit;
out->rsp_limit = in->rsp_limit;
*len_out = sizeof(*out);
return CXL_MBOX_SUCCESS;
}
static void cxl_set_dsp_active_bm(PCIBus *b, PCIDevice *d,
void *private)
{
@ -3105,6 +3155,10 @@ void cxl_initialize_t3_ld_cci(CXLCCI *cci, DeviceState *d, DeviceState *intf,
static const struct cxl_cmd cxl_cmd_set_t3_fm_owned_ld_mctp[256][256] = {
[INFOSTAT][IS_IDENTIFY] = { "IDENTIFY", cmd_infostat_identify, 0, 0},
[INFOSTAT][GET_RESPONSE_MSG_LIMIT] = { "GET_RESPONSE_MSG_LIMIT",
cmd_get_response_msg_limit, 0, 0 },
[INFOSTAT][SET_RESPONSE_MSG_LIMIT] = { "SET_RESPONSE_MSG_LIMIT",
cmd_set_response_msg_limit, 1, 0 },
[LOGS][GET_SUPPORTED] = { "LOGS_GET_SUPPORTED", cmd_logs_get_supported, 0,
0 },
[LOGS][GET_LOG] = { "LOGS_GET_LOG", cmd_logs_get_log, 0x18, 0 },