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Thu, 29 May 2025 09:40:19 -0700 (PDT) From: nifan.cxl@gmail.com To: jonathan.cameron@huawei.com, qemu-devel@nongnu.org Cc: linux-cxl@vger.kernel.org, a.manzanares@samsung.com, dave@stgolabs.net, nmtadam.samsung@gmail.com, nifan.cxl@gmail.com, anisa.su887@gmail.com, gourry@gourry.net, fan.ni@samsung.com, mst@redhat.com, Jonathan Cameron Subject: [Qemu PATCH v2] hw/cxl: fix DC extent capacity tracking Date: Thu, 29 May 2025 16:34:25 +0000 Message-ID: <20250529163925.2916725-1-nifan.cxl@gmail.com> X-Mailer: git-send-email 2.47.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::62a; envelope-from=nifan.cxl@gmail.com; helo=mail-pl1-x62a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1748536868972116600 Content-Type: text/plain; charset="utf-8" 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 Reviewed-by: Jonathan Cameron --- v2: 1) No functional changes; 2) Rebased the code to ToT of master branch; 3) Picked up tag; v1: https://lore.kernel.org/linux-cxl/20250520195741.789841-1-nifan.cxl@gmail.c= om/ --- 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; =20 - if (start_extent_id > ct3d->dc.total_extent_count) { + if (start_extent_id > ct3d->dc.nr_extents_accepted) { return CXL_MBOX_INVALID_INPUT; } =20 @@ -2761,7 +2761,7 @@ static CXLRetCode cmd_dcd_get_dyn_cap_ext_list(const = struct cxl_cmd *cmd, out_pl_len =3D sizeof(*out) + record_count * sizeof(out->records[0]); =20 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); =20 if (record_count > 0) { @@ -2883,16 +2883,20 @@ void cxl_extent_group_list_insert_tail(CXLDCExtentG= roupList *list, QTAILQ_INSERT_TAIL(list, group, node); } =20 -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 =3D QTAILQ_FIRST(list); + uint32_t extents_deleted =3D 0; =20 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; } =20 /* @@ -3011,7 +3015,7 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const struc= t cxl_cmd *cmd, CXLUpdateDCExtentListInPl *in =3D (void *)payload_in; CXLType3Dev *ct3d =3D CXL_TYPE3(cci->d); CXLDCExtentList *extent_list =3D &ct3d->dc.extents; - uint32_t i; + uint32_t i, num; uint64_t dpa, len; CXLRetCode ret; =20 @@ -3020,7 +3024,8 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const struc= t cxl_cmd *cmd, } =20 if (in->num_entries_updated =3D=3D 0) { - cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending); + num =3D cxl_extent_group_list_delete_front(&ct3d->dc.extents_pendi= ng); + ct3d->dc.total_extent_count -=3D num; return CXL_MBOX_SUCCESS; } =20 @@ -3051,10 +3056,12 @@ static CXLRetCode cmd_dcd_add_dyn_cap_rsp(const str= uct cxl_cmd *cmd, =20 cxl_insert_extent_to_extent_list(extent_list, dpa, len, NULL, 0); ct3d->dc.total_extent_count +=3D 1; + ct3d->dc.nr_extents_accepted +=3D 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 =3D cxl_extent_group_list_delete_front(&ct3d->dc.extents_pending); + ct3d->dc.total_extent_count -=3D num; =20 return CXL_MBOX_SUCCESS; } @@ -3160,7 +3167,7 @@ free_and_exit: } *updated_list_size =3D 0; } else { - *updated_list_size =3D ct3d->dc.total_extent_count + cnt_delta; + *updated_list_size =3D ct3d->dc.nr_extents_accepted + cnt_delta; } =20 return ret; @@ -3222,7 +3229,10 @@ static CXLRetCode cmd_dcd_release_dyn_cap(const stru= ct 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 =3D updated_list_size; + ct3d->dc.total_extent_count +=3D (updated_list_size - + ct3d->dc.nr_extents_accepted); + + ct3d->dc.nr_extents_accepted =3D updated_list_size; =20 return CXL_MBOX_SUCCESS; } diff --git a/hw/mem/cxl_type3.c b/hw/mem/cxl_type3.c index 94e7274912..f283178d88 100644 --- a/hw/mem/cxl_type3.c +++ b/hw/mem/cxl_type3.c @@ -2076,6 +2076,7 @@ static void qmp_cxl_process_dynamic_capacity_prescrip= tive(const char *path, } if (group) { cxl_extent_group_list_insert_tail(&dcd->dc.extents_pending, group); + dcd->dc.total_extent_count +=3D num_extents; } =20 /* diff --git a/include/hw/cxl/cxl_device.h b/include/hw/cxl/cxl_device.h index ed6cd50c67..a151e19da8 100644 --- a/include/hw/cxl/cxl_device.h +++ b/include/hw/cxl/cxl_device.h @@ -618,6 +618,7 @@ struct CXLType3Dev { CXLDCExtentList extents; CXLDCExtentGroupList extents_pending; uint32_t total_extent_count; + uint32_t nr_extents_accepted; uint32_t ext_list_gen_seq; =20 uint8_t num_regions; /* 0-8 regions */ @@ -696,7 +697,7 @@ CXLDCExtentGroup *cxl_insert_extent_to_extent_group(CXL= DCExtentGroup *group, uint16_t shared_seq); void cxl_extent_group_list_insert_tail(CXLDCExtentGroupList *list, CXLDCExtentGroup *group); -void cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list); +uint32_t cxl_extent_group_list_delete_front(CXLDCExtentGroupList *list); void ct3_set_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa, uint64_t len); void ct3_clear_region_block_backed(CXLType3Dev *ct3d, uint64_t dpa, --=20 2.47.2