From nobody Wed Nov 27 23:32:05 2024 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (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 A7BCD193061; Mon, 7 Oct 2024 23:17:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728343039; cv=none; b=tXNCrkRv0HsxcDwmCeZ9RDfijxXAxX+9aCsreAIgjhZxjcCb7yGAiV4VQUD8H+SkhAaJZpNULQDQaM8OYeS8eHIu50B7JX7gAYGQRX64fjghCKqD13OImpkTXMAd/qk4KpX0JTr/eSjdIDN6Fls0tufKd9x1z+g7zhz4heCUST8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728343039; c=relaxed/simple; bh=qM1m2pUoXc1sppU1JLZj43ZFqNMSdAopy9UnAspqefc=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=bv6nbRKspKJ4yxns4JobsED4ryrFTbW4pyFLoAtnn383s3pFGszhAutxLM0b/NTsArvhEdvJIII5Dlc9v7mQ/nX+Dtsao5Q6KG6QUHGAH5F1CyTR901ttAqGmim3gKlRL+LgTJlyCSGxuZEv75M1ueqV9I3fMRIWOEhGlHLA9XU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=mlGsR9N0; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="mlGsR9N0" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1728343038; x=1759879038; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=qM1m2pUoXc1sppU1JLZj43ZFqNMSdAopy9UnAspqefc=; b=mlGsR9N0sc8ZDjm771rhcBPnis9wIwqsJOygpGNjj1xI+FWtdx9wEBgO B8BqPVEEPC9PILSF8Ie3YbYQmFSqR9F0MiCyAG9WLQp+E9DAQx1emy9qF iUH0idT2Bb1rJ+dXQ/hrmEvB5A0+3gvZEOTv9p9DbPrNZAJsdPg9wQ9Ql HetE6ii4xT2qniGaRbwu2GEEzAN6omfQGOMDZ7hr7T5lPmNvZ5tz/2DWy 5BZW04lGBMzgu+dqfdOR0PWQWZyH7Fv55D4FmBrayEdNuEzO7DfoNzM2W 9ccjLaUp0bYiigEXh4x50t5MmFBMb+velEfj3tMBSIO0j9Qk56X2YdpxE Q==; X-CSE-ConnectionGUID: u6HWV/iuSBCSoKUH9ztmcg== X-CSE-MsgGUID: 6Ddg85hxT5S3aKXpJl/Jrg== X-IronPort-AV: E=McAfee;i="6700,10204,11218"; a="45036933" X-IronPort-AV: E=Sophos;i="6.11,185,1725346800"; d="scan'208";a="45036933" Received: from fmviesa007.fm.intel.com ([10.60.135.147]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Oct 2024 16:16:56 -0700 X-CSE-ConnectionGUID: Dt9TywtCSseXAQLBDOVlYw== X-CSE-MsgGUID: DScO9GQAQNqI8BhRan2C2w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.11,185,1725346800"; d="scan'208";a="75309125" Received: from ldmartin-desk2.corp.intel.com (HELO localhost) ([10.125.110.112]) by fmviesa007-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Oct 2024 16:16:53 -0700 From: ira.weiny@intel.com Date: Mon, 07 Oct 2024 18:16:20 -0500 Subject: [PATCH v4 14/28] cxl/port: Add endpoint decoder DC mode support to sysfs Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20241007-dcd-type2-upstream-v4-14-c261ee6eeded@intel.com> References: <20241007-dcd-type2-upstream-v4-0-c261ee6eeded@intel.com> In-Reply-To: <20241007-dcd-type2-upstream-v4-0-c261ee6eeded@intel.com> To: Dave Jiang , Fan Ni , Jonathan Cameron , Navneet Singh , Jonathan Corbet , Andrew Morton Cc: Dan Williams , Davidlohr Bueso , Alison Schofield , Vishal Verma , Ira Weiny , linux-btrfs@vger.kernel.org, linux-cxl@vger.kernel.org, linux-doc@vger.kernel.org, nvdimm@lists.linux.dev, linux-kernel@vger.kernel.org X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=ed25519-sha256; t=1728342968; l=6365; i=ira.weiny@intel.com; s=20221211; h=from:subject:message-id; bh=Wwal7/W3GJZGdURNsctdKcS4fKs7rhYXMIZP02QRH3o=; b=zdEvJtKSunr0PYy8vb9F9YYsIOWBWEPxjtGNZRbAxN3Rf+sbfGW1Yv5dkQ54KwwT/BTgO7Jnr E5y0bPWJHm4B1ovwrsmGjlnFd32E1R9YcDePGRW4w0j81Ifygsdcoxt X-Developer-Key: i=ira.weiny@intel.com; a=ed25519; pk=noldbkG+Wp1qXRrrkfY1QJpDf7QsOEthbOT7vm0PqsE= From: Navneet Singh Endpoint decoder mode is used to represent the partition the decoder points to such as ram or pmem. Expand the mode to allow a decoder to point to a specific DC partition (Region). Signed-off-by: Navneet Singh Co-developed-by: Ira Weiny Signed-off-by: Ira Weiny --- Changes: [iweiny: prevent creation of region on shareable DC partitions] [Fan: change mode range logic] [Fan: use !resource_size()] [djiang: use the static mode name string array in mode_store()] [Jonathan: remove rc check from mode to region index] [Jonathan: clarify decoder mode 'mixed'] [djbw: drop cleanup patch and just follow the convention in cxl_dpa_set_mod= e()] [fan: make dcd resource size check similar to other partitions] [djbw, jonathan, fan: remove mode range check from dc_mode_to_region_index] [iweiny: push sysfs versions to 6.12] --- Documentation/ABI/testing/sysfs-bus-cxl | 21 ++++++++++---------- drivers/cxl/core/hdm.c | 17 ++++++++++++++++ drivers/cxl/core/port.c | 10 +++++----- drivers/cxl/cxl.h | 35 ++++++++++++++++++-----------= ---- 4 files changed, 52 insertions(+), 31 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/te= sting/sysfs-bus-cxl index b865eefdb74c..661dab99183f 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -361,23 +361,24 @@ Description: =20 =20 What: /sys/bus/cxl/devices/decoderX.Y/mode -Date: May, 2022 -KernelVersion: v6.0 +Date: May, 2022, October 2024 +KernelVersion: v6.0, v6.12 (dcY) Contact: linux-cxl@vger.kernel.org Description: (RW) When a CXL decoder is of devtype "cxl_decoder_endpoint" it translates from a host physical address range, to a device local address range. Device-local address ranges are further split - into a 'ram' (volatile memory) range and 'pmem' (persistent - memory) range. The 'mode' attribute emits one of 'ram', 'pmem', - 'mixed', or 'none'. The 'mixed' indication is for error cases - when a decoder straddles the volatile/persistent partition - boundary, and 'none' indicates the decoder is not actively - decoding, or no DPA allocation policy has been set. + into a 'ram' (volatile memory) range, 'pmem' (persistent + memory) range, or Dynamic Capacity (DC) range. The 'mode' + attribute emits one of 'ram', 'pmem', 'dcY', 'mixed', or + 'none'. The 'mixed' indication is for error cases when a + decoder straddles partition boundaries, and 'none' indicates + the decoder is not actively decoding, or no DPA allocation + policy has been set. =20 'mode' can be written, when the decoder is in the 'disabled' - state, with either 'ram' or 'pmem' to set the boundaries for the - next allocation. + state, with 'ram', 'pmem', or 'dcY' to set the boundaries for + the next allocation. =20 =20 What: /sys/bus/cxl/devices/decoderX.Y/dpa_resource diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index 8c7f941eaba1..b368babb55d9 100644 --- a/drivers/cxl/core/hdm.c +++ b/drivers/cxl/core/hdm.c @@ -551,6 +551,7 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled, switch (mode) { case CXL_DECODER_RAM: case CXL_DECODER_PMEM: + case CXL_DECODER_DC0 ... CXL_DECODER_DC7: break; default: dev_dbg(dev, "unsupported mode: %d\n", mode); @@ -578,6 +579,22 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxle= d, goto out; } =20 + if (mode >=3D CXL_DECODER_DC0 && mode <=3D CXL_DECODER_DC7) { + struct cxl_memdev_state *mds =3D to_cxl_memdev_state(cxlds); + + rc =3D dc_mode_to_region_index(mode); + if (!resource_size(&cxlds->dc_res[rc])) { + dev_dbg(dev, "no available dynamic capacity\n"); + rc =3D -ENXIO; + goto out; + } + if (mds->dc_region[rc].shareable) { + dev_err(dev, "DC region %d is shareable\n", rc); + rc =3D -EINVAL; + goto out; + } + } + cxled->mode =3D mode; rc =3D 0; out: diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 85b912c11f04..23b4f266a83a 100644 --- a/drivers/cxl/core/port.c +++ b/drivers/cxl/core/port.c @@ -205,11 +205,11 @@ static ssize_t mode_store(struct device *dev, struct = device_attribute *attr, enum cxl_decoder_mode mode; ssize_t rc; =20 - if (sysfs_streq(buf, "pmem")) - mode =3D CXL_DECODER_PMEM; - else if (sysfs_streq(buf, "ram")) - mode =3D CXL_DECODER_RAM; - else + for (mode =3D CXL_DECODER_RAM; mode < CXL_DECODER_MIXED; mode++) + if (sysfs_streq(buf, cxl_decoder_mode_names[mode])) + break; + + if (mode >=3D CXL_DECODER_MIXED) return -EINVAL; =20 rc =3D cxl_dpa_set_mode(cxled, mode); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 8b7099c38a40..cbaacbe0f36d 100644 --- a/drivers/cxl/cxl.h +++ b/drivers/cxl/cxl.h @@ -365,6 +365,9 @@ struct cxl_decoder { /* * CXL_DECODER_DEAD prevents endpoints from being reattached to regions * while cxld_unregister() is running + * + * NOTE: CXL_DECODER_RAM must be second and CXL_DECODER_MIXED must be last. + * See mode_store() */ enum cxl_decoder_mode { CXL_DECODER_NONE, @@ -382,25 +385,25 @@ enum cxl_decoder_mode { CXL_DECODER_DEAD, }; =20 +static const char * const cxl_decoder_mode_names[] =3D { + [CXL_DECODER_NONE] =3D "none", + [CXL_DECODER_RAM] =3D "ram", + [CXL_DECODER_PMEM] =3D "pmem", + [CXL_DECODER_DC0] =3D "dc0", + [CXL_DECODER_DC1] =3D "dc1", + [CXL_DECODER_DC2] =3D "dc2", + [CXL_DECODER_DC3] =3D "dc3", + [CXL_DECODER_DC4] =3D "dc4", + [CXL_DECODER_DC5] =3D "dc5", + [CXL_DECODER_DC6] =3D "dc6", + [CXL_DECODER_DC7] =3D "dc7", + [CXL_DECODER_MIXED] =3D "mixed", +}; + static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode) { - static const char * const names[] =3D { - [CXL_DECODER_NONE] =3D "none", - [CXL_DECODER_RAM] =3D "ram", - [CXL_DECODER_PMEM] =3D "pmem", - [CXL_DECODER_DC0] =3D "dc0", - [CXL_DECODER_DC1] =3D "dc1", - [CXL_DECODER_DC2] =3D "dc2", - [CXL_DECODER_DC3] =3D "dc3", - [CXL_DECODER_DC4] =3D "dc4", - [CXL_DECODER_DC5] =3D "dc5", - [CXL_DECODER_DC6] =3D "dc6", - [CXL_DECODER_DC7] =3D "dc7", - [CXL_DECODER_MIXED] =3D "mixed", - }; - if (mode >=3D CXL_DECODER_NONE && mode <=3D CXL_DECODER_MIXED) - return names[mode]; + return cxl_decoder_mode_names[mode]; return "mixed"; } =20 --=20 2.46.0