On Tue, May 20, 2025 at 12:56:43PM -0700, [email protected] wrote:
> From: Fan Ni
>
> Per cxl r3.2 Section 9.13.3.3, extent capacity tracking should include
> extents in different states including added, pending, etc.
>
> Before the change, for the in-device extent number tracking purpose, we only
> have "total_extent_count" defined, which only tracks the number of
> extents accepted. However, we need to track number of extents in other
> states also, for now it is extents pending-to-add.
>
> To fix that, we introduce a new counter for dynamic capacity
> "nr_extents_accepted" which explicitly tracks number of the extents
> accepted by the hosts, and fix "total_extent_count" to include
> both accepted and pending extents counting.
>
> Signed-off-by: Fan Ni
Ping ...
Hi Jonathan,
The FM DCD management mailbox patches needs to be on top of this fix.
Fan
> ---
> hw/cxl/cxl-mailbox-utils.c | 26 ++
> hw/mem/cxl_type3.c | 1 +
> include/hw/cxl/cxl_device.h | 3 ++-
> 3 files changed, 21 insertions(+), 9 deletions(-)
>
> diff --git a/hw/cxl/cxl-mailbox-utils.c b/hw/cxl/cxl-mailbox-utils.c
> index 299f232f26..0b615ea37a 100644
> --- a/hw/cxl/cxl-mailbox-utils.c
> +++ b/hw/cxl/cxl-mailbox-utils.c
> @@ -2750,7 +2750,7 @@ static CXLRetCode cmd_dcd_get_dyn_cap_ext_list(const
> struct cxl_cmd *cmd,
> uint16_t out_pl_len, size;
> CXLDCExtent *ent;
>
> -if (start_extent_id > ct3d->dc.total_extent_count) {
> +if (start_extent_id > ct3d->dc.nr_extents_accepted) {
> return CXL_MBOX_INVALID_INPUT;
> }
>
> @@ -2761,7 +2761,7 @@ static CXLRetCode cmd_dcd_get_dyn_cap_ext_list(const
> struct cxl_cmd *cmd,
> out_pl_len = sizeof(*out) + record_count * sizeof(out->records[0]);
>
> stl_le_p(&out->count, record_count);
> -stl_le_p(&out->total_extents, ct3d->dc.total_extent_count);
> +stl_le_p(&out->total_extents, ct3d->dc.nr_extents_accepted);
> stl_le_p(&out->generation_num, ct3d->dc.ext_list_gen_seq);
>
> if (record_count > 0) {
> @@ -2883,16 +2883,20 @@ void
> cxl_extent_group_list_insert_tail(CXLDCExtentGroupList *list,
> QTAILQ_INSERT_TAIL(list, group, node);
> }
>
> -void cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list)
> +uint32_t cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list)
> {
> CXLDCExtent *ent, *ent_next;
> CXLDCExtentGroup *group = QTAILQ_FIRST(list);
> +uint32_t extents_deleted = 0;
>
> QTAILQ_REMOVE(list, group, node);
> QTAILQ_FOREACH_SAFE(ent, &group->list, node, ent_next) {
> cxl_remove_extent_from_extent_list(&group->list, ent);
> +extents_deleted++;
> }
> g_free(group);
> +
> +return extents_deleted;
> }
>
> /*
> @@ -3011,7 +3015,7 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const struct
> cxl_cmd *cmd,
> CXLUpdateDCExtentListInPl *in = (void *)payload_in;
> CXLType3Dev *ct3d = CXL_TYPE3(cci->d);
> CXLDCExtentList *extent_list = &ct3d->dc.extents;
> -uint32_t i;
> +uint32_t i, num;
> uint64_t dpa, len;
> CXLRetCode ret;
>
> @@ -3020,7 +3024,8 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const struct
> cxl_cmd *cmd,
> }
>
> if (in->num_entries_updated == 0) {
> -cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending);
> +num = cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending);
> +ct3d->dc.total_extent_count -= num;
> return CXL_MBOX_SUCCESS;
> }
>
> @@ -3051,10 +3056,12 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const
> struct cxl_cmd *cmd,
>
> cxl_insert_extent_to_extent_list(extent_list, dpa, len, NULL, 0);
> ct3d->dc.total_extent_count += 1;
> +ct3d->dc.nr_extents_accepted += 1;
> ct3_set_region_block_backed(ct3d, dpa, len);
> }
> /* Remove the first extent group in the pending list */
> -cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending);
> +num = cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending);
> +ct3d->dc.total_extent_count -= num;
>
> return CXL_MBOX_SUCCESS;
> }
> @@ -3160,7 +3167,7 @@ free_and_exit:
> }
> *updated_list_size = 0;
> } else {
> -*updated_list_size = ct3d->dc.total_extent_count + cnt_delta;
> +*updated_list_size = ct3d->dc.nr_extents_accepted + cnt_delta;
> }
>
> return ret;
> @@ -3222,7 +3229,10 @@ static CXLRetCode cmd_dcd_release_dyn_cap(const struct
> cxl_cmd *cmd,
> ct3_set_region_block_backed(ct3d, ent->start_dpa, ent->len);
> cxl_remove_extent_from_extent_list(&updated_list, ent);
> }
> -ct3d->dc.total_extent_count = updated_list_size;
> +ct3d->dc.total_extent_count += (updated_list_size -
> +ct3d->dc.nr_extents_accepted);
> +
> +ct3d->dc.nr_extents_accepted = updated_list_size;
>
> return CXL_MBOX_SUCCESS;
> }
> diff --git a/hw/mem/cxl_type
