From: Anisa Su <anisa...@samsung.com> This patchset adds support for 6 FM API DCD Management commands (0x5600-0x5605) according to the CXL r3.2 Spec. It is based on the following branch: https://gitlab.com/jic23/qemu/-/tree/cxl-2025-02-20.
The code was tested with libcxlmi, which runs in the QEMU VM and sends 56xxh commands to the device (QEMU emulated) through MCTP messages over I2C bus. To perform end-to-end tests, both MCTP and DCD support are needed for the kernel, so the needed MCTP patches are applied on top of Ira's DCD branch https://github.com/weiny2/linux-kernel/tree/dcd-v4-2024-12-11. For the tests of commands 0x5600 (Get DCD Info), 0x5601 (Get Host DC Region Config), and 0x5603 (Get DC Region Extent Lists), DCD kernel code is not involved. The libcxlmi test program is used to send the command to the device and results are collected and verified. For command 0x5602 (Set DC Region Config): device creates an event record with type DC_EVENT_REGION_CONFIG_UPDATED and triggers an interrupt to the host if the configuration changes as a result of the command. Currently, the kernel version used to test this only supports Add/Release type events. Thus, this request essentially gets ignored but did not cause problems besides the host not knowing about the configuration change when tested. For the command 0x5604 (Initiate DC Add) and 0x5605 (Initiate DC Release), the tests involve libcxlmi test program (acting as the FM), kernel DCD code (host) and QEMU device. The test workflow follows that in cxl r3.2 section 7.6.7.6.5 and 7.6.7.6.6. More specifically, the tests involve following steps, 1. Start a VM with CXL topology: https://github.com/moking/cxl-test-tool/blob/main/utils/cxl.py#L54. 2. Load the CXL related drivers in the VM; 3. Create a DC region for the DCD device attached. 4. add/release DC extents by sending 0x5604 and 0x5605 respectively through the out-of-tree libcxlmi test program (https://github.com/anisa-su993/libcxlmi/blob/dcd_management_cmds/tests/test-fmapi.c). 5. Check and verify the extents by retrieving the extents list through command 0x5603 in the test program. The remaining 3 commands in this series (0x5606-0x5608) are related to tags and sharing, thus have not been implemented. Anisa Su (9): cxl/type3: Add supported block sizes bitmask to CXLDCRegion struct cxl-mailbox-utils: 0x5600 - FMAPI Get DCD Info cxl/type3: Add dsmas_flags to CXLDCRegion struct cxl-mailbox-utils: 0x5601 - FMAPI Get Host Region Config cxl_events.h: move definition for dynamic_capacity_uuid and enum for DC event types cxl-mailbox-utils: 0x5602 - FMAPI Set DC Region Config cxl-mailbox-utils: 0x5603 - FMAPI Get DC Region Extent Lists cxl-mailbox-utils: 0x5604 - FMAPI Initiate DC Add cxl-mailbox-utils: 0x5605 - FMAPI Initiate DC Release hw/cxl/cxl-mailbox-utils.c | 615 +++++++++++++++++++++++++++++++++++ hw/cxl/i2c_mctp_cxl.c | 6 +- hw/mem/cxl_type3.c | 30 +- include/hw/cxl/cxl_device.h | 9 + include/hw/cxl/cxl_events.h | 15 + include/hw/cxl/cxl_mailbox.h | 6 + 6 files changed, 660 insertions(+), 21 deletions(-) -- 2.47.2
