[NDCTL PATCH v3 0/3] ndctl: Add support of qos_class for CXL CLI

From: Dave Jiang <dave.jiang@intel.com>
To: linux-cxl@vger.kernel.org, nvdimm@lists.linux.dev
Cc: vishal.l.verma@intel.com
Subject: [NDCTL PATCH v3 0/3] ndctl: Add support of qos_class for CXL CLI
Date: Wed, 24 Jan 2024 13:54:35 -0700	[thread overview]
Message-ID: <170612961495.2745924.4942817284170536877.stgit@djiang5-mobl3> (raw)

Hi Vishal,
With the QoS class series merged to the v6.8 kernel, can you please review and
apply this series to ndctl if acceptable?

v3:
- Rebase against latest ndctl/pending branch.

The series adds support for the kernel enabling of QoS class in the v6.8
kernel. The kernel exports a qos_class token for the root decoders (CFMWS) and as
well as for the CXL memory devices. The qos_class exported for a device is
calculated by the driver during device probe. Currently a qos_class is exported
for the volatile partition (ram) and another for the persistent partition (pmem).
In the future qos_class will be exported for DCD regions. Display of qos_class is
through the CXL CLI list command with -vvv for extra verbose.

A qos_class check as also been added for region creation. A warning is emitted
when the qos_class of a memory range of a CXL memory device being included in
the CXL region assembly does not match the qos_class of the root decoder. Options
are available to suppress the warning or to fail the region creation. This
enabling provides a guidance on flagging memory ranges being used is not
optimal for performance for the CXL region to be formed.

---

Dave Jiang (3):
      ndctl: cxl: Add QoS class retrieval for the root decoder
      ndctl: cxl: Add QoS class support for the memory device
      ndctl: cxl: add QoS class check for CXL region creation

 Documentation/cxl/cxl-create-region.txt |  9 ++++
 cxl/filter.h                            |  4 ++
 cxl/json.c                              | 46 ++++++++++++++++-
 cxl/lib/libcxl.c                        | 62 +++++++++++++++++++++++
 cxl/lib/libcxl.sym                      |  3 ++
 cxl/lib/private.h                       |  3 ++
 cxl/libcxl.h                            | 10 ++++
 cxl/list.c                              |  1 +
 cxl/region.c                            | 67 ++++++++++++++++++++++++-
 util/json.h                             |  1 +
 10 files changed, 204 insertions(+), 2 deletions(-)

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