From patchwork Wed Aug 10 23:09:04 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Verma, Vishal L" X-Patchwork-Id: 12940994 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 28E004A05 for ; Wed, 10 Aug 2022 23:09:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1660172975; x=1691708975; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=IgDPZkTj8OWicxyeDb2nka/I4dLrq3fbpj7i9AcVc+0=; b=LkKev9+3ic7TtQvnRj1KJ4yX1B0/osvQTYvTGbTO9iAIA8xhSX1sruOG TyJecItpbay5YpkSM4eDYvzrVxc7iBwBCPPriX/qjPqU75wE4F4KR7I76 66uoJWnmPQfibrTgR+PQNAejv2nXVXGjBmmn+E6aAcBlos8TpSrS4nVTa RaK3uC9r9GadkIH3gdqPL9zMfUhPa4zXRGhZASPr6/msvOOlWAbpExqU2 uoYNQoooyXUIqigstDKpw5R0drGqm7EV5DsuJAZam48dgWnQ3xZiKXkJw rNfkDonJ0pbDMlVAWzvSIaB1zKvCGk66UXCEqecjsCUoa7FBfqq1iJHex A==; X-IronPort-AV: E=McAfee;i="6400,9594,10435"; a="292471270" X-IronPort-AV: E=Sophos;i="5.93,228,1654585200"; d="scan'208";a="292471270" Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Aug 2022 16:09:32 -0700 X-IronPort-AV: E=Sophos;i="5.93,228,1654585200"; d="scan'208";a="581429410" Received: from maughenb-mobl.amr.corp.intel.com (HELO vverma7-desk1.intel.com) ([10.209.94.5]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Aug 2022 16:09:30 -0700 From: Vishal Verma To: Cc: , Dan Williams , Alison Schofield , Ira Weiny , Dave Jiang , Vishal Verma Subject: [ndctl PATCH v2 00/10] cxl: add region management Date: Wed, 10 Aug 2022 17:09:04 -0600 Message-Id: <20220810230914.549611-1-vishal.l.verma@intel.com> X-Mailer: git-send-email 2.37.1 Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5805; h=from:subject; bh=IgDPZkTj8OWicxyeDb2nka/I4dLrq3fbpj7i9AcVc+0=; b=owGbwMvMwCXGf25diOft7jLG02pJDElfrKb8i34rxxl4REllksfUPQ49s+t0LtvEK7VEezyRyD6f XaXYUcrCIMbFICumyPJ3z0fGY3Lb83kCExxh5rAygQxh4OIUgIkkVzAyzH3+ycu7ccvik5bWcncnh+ ud2XIqr23+6a//uufsyfm38SDDPwupGed7tr1j+XR0+YRHyzc8FfC39ktm5VJZ7mJ5W9EgnwcA X-Developer-Key: i=vishal.l.verma@intel.com; a=openpgp; fpr=F8682BE134C67A12332A2ED07AFA61BEA3B84DFF Changes since v1[1]: - Collect review tags - Fix order of setting region size vs UUID (Dan) - Rename region_{commit,decommit} to region_decode{commit,reset} everywhere (Dan) - Add a -b option to all region management commands - Add a cxl-create-region unit test - Use walk_children pattern for root decoders vs. regions (Dan) - Add bus, port, and (root) decoder based filters for regions (Dan) - Add a 'REGIONS' section to the libcxl(3) documentation (Dan) - s/--interleave-ways/--ways/ and s/interleave-granularity/--granularity/ (Dan) - Rename and clarify memdev_match_set_size() with a comment (Dan) - Remove a double init in memdev_match_set_size() (Dan) - Rework granularity determination (Dan) - Ensure ep_decoder is free before changing its mode (Dan) - Fix a mid-series compile breakage in region_action() (Dan) - Fix missing whitespace in region_action() (Dan) - Refactor region_action for too much indentation (Dan) - Save error state from multi-region operations in region_action() - Free leaky region objects (when the parent decoder is freed) - Consider root decoder's available size before creating a region (Dan) [1]: https://lore.kernel.org/linux-cxl/20220715062550.789736-1-vishal.l.verma@intel.com/ --- Introduce the first cut at a 'cxl create-region' command, which uses the ABI merged in the kernel in [2], and builds on the create-region foundation laid out in [3]. This introduces libcxl objects for regions and their memdev mappings, adds listing support for them, and libcxl APIs to create, enable, disable, and destroy regions. These are consumed by respective cxl-cli commands to perform the same region management operations. The 'cxl create-region' command deserves a bit more detail. Its current version can be considered a fundamental 'plumbing' implementation. It allows, and in some cases, requires the user to specify the parameters for the region being created. Future enhancements to this will allow a simple 'cxl create-region' invocation to automatically pick suitable root decoders, memdev endpoints, and interleave settings to create a maximally sized and interleaved region. Today, the create-region command requires the following from the user: -d : the root decoder (CFMWS window) under which to create the region -m or -e : the memdev or endpoint decoder targets that will form the new region It can pick the following settings automatically (though the user can also override these if desired): -w : interleave ways - picked based on the number of memdev / endpoint decoder targets supplied -g : interleave granularity - selects the interleave granularity advertised by the root decoder -t : type of region - defaults to pmem. The ram (volatile) type is not supported yet. -s : size of region - deduced based on sizes of the specified targets [2]: https://git.kernel.org/torvalds/c/c235698355fa94df7073b51befda7d4be00a0e23 [3]: https://lore.kernel.org/linux-cxl/165781810717.1555691.1411727384567016588.stgit@dwillia2-xfh.jf.intel.com/ Vishal Verma (10): libcxl: add a depth attribute to cxl_port cxl/port: Consolidate the debug option in cxl-port man pages libcxl: Introduce libcxl region and mapping objects cxl-cli: add region listing support libcxl: add low level APIs for region creation cxl: add a 'create-region' command cxl: add commands to {enable,disable,destroy}-region cxl/list: make memdevs and regions the default listing test: add a cxl-create-region test cxl/decoder: add a max_available_extent attribute Documentation/cxl/bus-option.txt | 5 + Documentation/cxl/cxl-create-region.txt | 114 +++ Documentation/cxl/cxl-destroy-region.txt | 41 ++ Documentation/cxl/cxl-disable-port.txt | 5 +- Documentation/cxl/cxl-disable-region.txt | 36 + Documentation/cxl/cxl-enable-port.txt | 5 +- Documentation/cxl/cxl-enable-region.txt | 36 + Documentation/cxl/cxl-list.txt | 13 +- Documentation/cxl/debug-option.txt | 4 + Documentation/cxl/decoder-option.txt | 6 + Documentation/cxl/lib/libcxl.txt | 69 ++ Documentation/cxl/region-description.txt | 7 + cxl/lib/private.h | 38 + cxl/lib/libcxl.c | 889 ++++++++++++++++++++++- cxl/builtin.h | 4 + cxl/filter.h | 6 + cxl/json.h | 5 + cxl/libcxl.h | 67 +- cxl/cxl.c | 4 + cxl/filter.c | 158 +++- cxl/json.c | 131 ++++ cxl/list.c | 26 +- cxl/region.c | 797 ++++++++++++++++++++ .clang-format | 2 + Documentation/cxl/meson.build | 7 + cxl/lib/libcxl.sym | 37 + cxl/meson.build | 1 + test/cxl-create-region.sh | 126 ++++ test/meson.build | 2 + 29 files changed, 2598 insertions(+), 43 deletions(-) create mode 100644 Documentation/cxl/bus-option.txt create mode 100644 Documentation/cxl/cxl-create-region.txt create mode 100644 Documentation/cxl/cxl-destroy-region.txt create mode 100644 Documentation/cxl/cxl-disable-region.txt create mode 100644 Documentation/cxl/cxl-enable-region.txt create mode 100644 Documentation/cxl/debug-option.txt create mode 100644 Documentation/cxl/decoder-option.txt create mode 100644 Documentation/cxl/region-description.txt create mode 100644 cxl/region.c create mode 100644 test/cxl-create-region.sh