On Thu, Jun 26, 2025 at 10:23:32PM +0000, [email protected] wrote:
> From: Anisa Su <[email protected]>
>
> FM DCD Management command 0x5604 implemented per CXL r3.2 Spec Section
> 7.6.7.6.5
>
> Signed-off-by: Anisa Su <[email protected]>
> ---
Minor comments inline...
> hw/cxl/cxl-mailbox-utils.c | 106 ++++++++++++++++++++++++++++++++++++
> hw/mem/cxl_type3.c | 8 +--
> include/hw/cxl/cxl_device.h | 4 ++
> 3 files changed, 114 insertions(+), 4 deletions(-)
>
> diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> index 382c41c025..787eeaa7b9 100644
> --- a/hw/cxl/cxl-mailbox-utils.c
> +++ b/hw/cxl/cxl-mailbox-utils.c
> @@ -122,6 +122,7 @@ enum {
> #define GET_HOST_DC_REGION_CONFIG 0x1
> #define SET_DC_REGION_CONFIG 0x2
> #define GET_DC_REGION_EXTENT_LIST 0x3
> + #define INITIATE_DC_ADD 0x4
> };
>
> /* CCI Message Format CXL r3.1 Figure 7-19 */
> @@ -3539,6 +3540,104 @@ static CXLRetCode
> cmd_fm_get_dc_region_extent_list(const struct cxl_cmd *cmd,
> return CXL_MBOX_SUCCESS;
> }
>
> +/*
> + * Helper function to convert CXLDCExtentRaw to CXLUpdateDCExtentListInPl
> + * in order to reuse cxl_detect_malformed_extent_list() function which
> accepts
> + * CXLUpdateDCExtentListInPl as a parameter.
> + */
> +static void convert_raw_extents(CXLDCExtentRaw raw_extents[],
> + CXLUpdateDCExtentListInPl *extent_list,
> + int count)
> +{
> + int i;
> +
> + extent_list->num_entries_updated = count;
> +
> + for (i = 0; i < count; i++) {
> + extent_list->updated_entries[i].start_dpa = raw_extents[i].start_dpa;
> + extent_list->updated_entries[i].len = raw_extents[i].len;
> + }
> +}
> +
> +/* CXL r3.2 Section 7.6.7.6.5 Initiate Dynamic Capacity Add (Opcode 5604h) */
Keep the spec reference comments consistent like below,
/* CXL r3.2 Section 7.6.7.6.5: Initiate Dynamic Capacity Add (Opcode 5604h) */
> +static CXLRetCode cmd_fm_initiate_dc_add(const struct cxl_cmd *cmd,
> + uint8_t *payload_in,
> + size_t len_in,
> + uint8_t *payload_out,
> + size_t *len_out,
> + CXLCCI *cci)
> +{
> + struct {
> + uint16_t host_id;
> + uint8_t selection_policy;
> + uint8_t reg_num;
> + uint64_t length;
> + uint8_t tag[0x10];
> + uint32_t ext_count;
> + CXLDCExtentRaw extents[];
> + } QEMU_PACKED *in = (void *)payload_in;
> + CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
> + int i, rc;
> +
> + switch (in->selection_policy) {
> + case CXL_EXTENT_SELECTION_POLICY_PRESCRIPTIVE: {
> + /* Adding extents exceeds device's extent tracking ability. */
> + if (in->ext_count + ct3d->dc.total_extent_count >
> + CXL_NUM_EXTENTS_SUPPORTED) {
> + return CXL_MBOX_RESOURCES_EXHAUSTED;
> + }
> +
> + g_autofree CXLUpdateDCExtentListInPl *list =
This seems not consistent with existing code style. Type declaration
comes first.
> + g_malloc0(sizeof(*list) +
> + in->ext_count * sizeof(*list->updated_entries));
> +
> + convert_raw_extents(in->extents, list, in->ext_count);
> + rc = cxl_detect_malformed_extent_list(ct3d, list);
> +
> + for (i = 0; i < in->ext_count; i++) {
> + CXLDCExtentRaw ext = in->extents[i];
Use pointer as Jonathan mentioned.
> + /* Check requested extents do not overlap with pending
> extents. */
shorten the comments like
Extents to add cannot overlap with pending extents
> + if
> (cxl_extent_groups_overlaps_dpa_range(&ct3d->dc.extents_pending,
> + ext.start_dpa,
> ext.len)) {
> + return CXL_MBOX_INVALID_EXTENT_LIST;
> + }
> + /* Check requested extents do not overlap with existing
> extents. */
Not allowed to add extents already existing
> + if (cxl_extents_overlaps_dpa_range(&ct3d->dc.extents,
> + ext.start_dpa, ext.len)) {
> + return CXL_MBOX_INVALID_EXTENT_LIST;
> + }
> + }
> +
> + if (rc) {
> + return rc;
> + }
> +
> + CXLDCExtentGroup *group = NULL;
> + for (i = 0; i < in->ext_count; i++) {
> + group = cxl_insert_extent_to_extent_group(group,
> +
> in->extents[i].start_dpa,
> + in->extents[i].len,
> + in->extents[i].tag,
> +
> in->extents[i].shared_seq);
Shorten the lines as Jonathan suggested.
Fan
> + }
> +
> + cxl_extent_group_list_insert_tail(&ct3d->dc.extents_pending,
> group);
> + ct3d->dc.total_extent_count += in->ext_count;
> + cxl_create_dc_event_records_for_extents(ct3d,
> + DC_EVENT_ADD_CAPACITY,
> + in->extents,
> + in->ext_count);
> +
> + return CXL_MBOX_SUCCESS;
> + }
> + default: {
> + qemu_log_mask(LOG_UNIMP,
> + "CXL extent selection policy not supported.\n");
> + return CXL_MBOX_INVALID_INPUT;
> + }
> + }
> +}
> +
> static const struct cxl_cmd cxl_cmd_set[256][256] = {
> [INFOSTAT][BACKGROUND_OPERATION_ABORT] = { "BACKGROUND_OPERATION_ABORT",
> cmd_infostat_bg_op_abort, 0, 0 },
> @@ -3666,6 +3765,13 @@ static const struct cxl_cmd
> cxl_cmd_set_fm_dcd[256][256] = {
> CXL_MBOX_IMMEDIATE_DATA_CHANGE) },
> [FMAPI_DCD_MGMT][GET_DC_REGION_EXTENT_LIST] = {
> "GET_DC_REGION_EXTENT_LIST",
> cmd_fm_get_dc_region_extent_list, 12, 0 },
> + [FMAPI_DCD_MGMT][INITIATE_DC_ADD] = { "INIT_DC_ADD",
> + cmd_fm_initiate_dc_add, ~0,
> + (CXL_MBOX_CONFIG_CHANGE_COLD_RESET |
> + CXL_MBOX_CONFIG_CHANGE_CONV_RESET |
> + CXL_MBOX_CONFIG_CHANGE_CXL_RESET |
> + CXL_MBOX_IMMEDIATE_CONFIG_CHANGE |
> + CXL_MBOX_IMMEDIATE_DATA_CHANGE) },
> };
>
> /*
> diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c
> index 9c2b9d197b..7676d785c2 100644
> --- a/hw/mem/cxl_type3.c
> +++ b/hw/mem/cxl_type3.c
> @@ -1885,8 +1885,8 @@ void qmp_cxl_inject_memory_module_event(const char
> *path, CxlEventLog log,
> * the list.
> * Return value: return true if has overlaps; otherwise, return false
> */
> -static bool cxl_extents_overlaps_dpa_range(CXLDCExtentList *list,
> - uint64_t dpa, uint64_t len)
> +bool cxl_extents_overlaps_dpa_range(CXLDCExtentList *list,
> + uint64_t dpa, uint64_t len)
> {
> CXLDCExtent *ent;
> Range range1, range2;
> @@ -1931,8 +1931,8 @@ bool cxl_extents_contains_dpa_range(CXLDCExtentList
> *list,
> return false;
> }
>
> -static bool cxl_extent_groups_overlaps_dpa_range(CXLDCExtentGroupList *list,
> - uint64_t dpa, uint64_t len)
> +bool cxl_extent_groups_overlaps_dpa_range(CXLDCExtentGroupList *list,
> + uint64_t dpa, uint64_t len)
> {
> CXLDCExtentGroup *group;
>
> diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h
> index 91ec1ba299..7be68d98c6 100644
> --- a/include/hw/cxl/cxl_device.h
> +++ b/include/hw/cxl/cxl_device.h
> @@ -736,4 +736,8 @@ void cxl_create_dc_event_records_for_extents(CXLType3Dev
> *ct3d,
> CXLDCEventType type,
> CXLDCExtentRaw extents[],
> uint32_t ext_count);
> +bool cxl_extents_overlaps_dpa_range(CXLDCExtentList *list,
> + uint64_t dpa, uint64_t len);
> +bool cxl_extent_groups_overlaps_dpa_range(CXLDCExtentGroupList *list,
> + uint64_t dpa, uint64_t len);
> #endif
> --
> 2.47.2
>
--
Fan Ni (From gmail)
