From patchwork Fri Aug 16 13:59:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ira Weiny X-Patchwork-Id: 13766332 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.15]) (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 606451C2301; Fri, 16 Aug 2024 14:00:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723816816; cv=none; b=jl5AD29mFfVjGRDaBrmVFQjlqdqEb4Bla556qIQi62QCZf79v+pyPgng9OdJ10iDDX9MjYAZuLA6ugI6/w6VZbYxaHhigqaH+wA1q/2no2u3sbPkKZrnKf3WXg83BSiPsCdpi4YNdfdFNH9msNjljRbpShyIo0Vd6OT8mTWdbLo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723816816; c=relaxed/simple; bh=vS8COK5ONXmBd+v9Pw/7t83kDsPGQ3h+k3bU/+IWHss=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=TWnnO9PqnY6d5Em2fiJBaYJ3u/eTiLxUlLCfGHI3ZR3EHgtqezUlPQ/scaJIl8wDgdi3694wyAuy5d5sDS2pcdMVLzYdusa/rlTbeNxIsvZ++/ygUpgaBufHC5FjY5vnP0T8txWAeyv3Xanb/YUoaky/6uifXtIq3GT71MNjHr8= 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=CROXyWvX; arc=none smtp.client-ip=192.198.163.15 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="CROXyWvX" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723816814; x=1755352814; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=vS8COK5ONXmBd+v9Pw/7t83kDsPGQ3h+k3bU/+IWHss=; b=CROXyWvXvYM1bxV75fIUEX2RnxtrPQnk9S+9w4iKKth1qnhZsSPqOoym d3hxYxMuMafuvKAr3LTKe3rC45a0bT/bMpjVOH01JjO8I5nzJgb9t5sb3 DkKNI/fGGhoYKyZGc3z49nC703CqAHklez+HJXWBS1TbPetXVBt70f2yz r6kNhSZ4bFhN/LYl4HTcdcycNl3FWU4yIL/fSJuzUELixrWuGpa5rJKyE 6EoaMhKig/0s+OUzV5ZdXSz1g+J/dyv6ZO1Cq4+bnMlMFg2Z7trTERR1S OruuVHIPMzGpBO5rZqKCJl2Z41m9McBY9r/Wpb9pqc1Ut20PQBGgfaJsb Q==; X-CSE-ConnectionGUID: d5iepILuQuyYXrQoOqfeUQ== X-CSE-MsgGUID: 2y2sRz8jS6Sppkpx3+mJSA== X-IronPort-AV: E=McAfee;i="6700,10204,11166"; a="22272792" X-IronPort-AV: E=Sophos;i="6.10,151,1719903600"; d="scan'208";a="22272792" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa109.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2024 07:00:13 -0700 X-CSE-ConnectionGUID: aX7X86weQkidX6zq2mEEng== X-CSE-MsgGUID: fq7/v0buQR6GDmtcIq+mLg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,151,1719903600"; d="scan'208";a="90411267" Received: from iweiny-mobl.amr.corp.intel.com (HELO localhost) ([10.125.111.52]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2024 07:00:13 -0700 From: ira.weiny@intel.com Date: Fri, 16 Aug 2024 08:59:58 -0500 Subject: [PATCH v2 10/25] cxl/port: Add endpoint decoder DC mode support to sysfs Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240816-dcd-type2-upstream-v2-10-20189a10ad7d@intel.com> References: <20240816-dcd-type2-upstream-v2-0-20189a10ad7d@intel.com> In-Reply-To: <20240816-dcd-type2-upstream-v2-0-20189a10ad7d@intel.com> To: Dave Jiang , Fan Ni , Jonathan Cameron , Navneet Singh Cc: Dan Williams , Davidlohr Bueso , Alison Schofield , Vishal Verma , Ira Weiny , linux-btrfs@vger.kernel.org, linux-cxl@vger.kernel.org, linux-kernel@vger.kernel.org X-Mailer: b4 0.13-dev-2d940 X-Developer-Signature: v=1; a=ed25519-sha256; t=1723816790; l=6095; i=ira.weiny@intel.com; s=20221211; h=from:subject:message-id; bh=cMje7vWnYC+ErlwgLy791KZR8UUSe5SVqngdUwWVktE=; b=AfZckVztyTR+L9c31WpxqE/zGjQ7Ur7sO1B51EE2unzCyrF3LgR6wxMkJGXSUfQiUvYSUI4aI Z34dK5wmdywCm2eF0VvWKHBPn8GON+WMKweNOwosQUE1c2W2SThSyue 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: [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_mode()] [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 | 10 ++++++++++ drivers/cxl/core/port.c | 10 +++++----- drivers/cxl/cxl.h | 35 ++++++++++++++++++--------------- 4 files changed, 45 insertions(+), 31 deletions(-) diff --git a/Documentation/ABI/testing/sysfs-bus-cxl b/Documentation/ABI/testing/sysfs-bus-cxl index 3f5627a1210a..957717264709 100644 --- a/Documentation/ABI/testing/sysfs-bus-cxl +++ b/Documentation/ABI/testing/sysfs-bus-cxl @@ -316,23 +316,24 @@ Description: 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. '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. What: /sys/bus/cxl/devices/decoderX.Y/dpa_resource diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c index b4a517c6d283..ceca0b3d3e5c 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 +579,15 @@ int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled, goto out; } + if (mode >= CXL_DECODER_DC0 && mode <= CXL_DECODER_DC7) { + rc = dc_mode_to_region_index(mode); + if (!resource_size(&cxlds->dc_res[rc])) { + dev_dbg(dev, "no available dynamic capacity\n"); + rc = -ENXIO; + goto out; + } + } + cxled->mode = mode; rc = 0; out: diff --git a/drivers/cxl/core/port.c b/drivers/cxl/core/port.c index 8054cbaac9f6..222aa0aeeef7 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; - if (sysfs_streq(buf, "pmem")) - mode = CXL_DECODER_PMEM; - else if (sysfs_streq(buf, "ram")) - mode = CXL_DECODER_RAM; - else + for (mode = CXL_DECODER_RAM; mode < CXL_DECODER_MIXED; mode++) + if (sysfs_streq(buf, cxl_decoder_mode_names[mode])) + break; + + if (mode >= CXL_DECODER_MIXED) return -EINVAL; rc = cxl_dpa_set_mode(cxled, mode); diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h index 53b666ef4097..cda7e40b9a48 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, }; +static const char * const cxl_decoder_mode_names[] = { + [CXL_DECODER_NONE] = "none", + [CXL_DECODER_RAM] = "ram", + [CXL_DECODER_PMEM] = "pmem", + [CXL_DECODER_DC0] = "dc0", + [CXL_DECODER_DC1] = "dc1", + [CXL_DECODER_DC2] = "dc2", + [CXL_DECODER_DC3] = "dc3", + [CXL_DECODER_DC4] = "dc4", + [CXL_DECODER_DC5] = "dc5", + [CXL_DECODER_DC6] = "dc6", + [CXL_DECODER_DC7] = "dc7", + [CXL_DECODER_MIXED] = "mixed", +}; + static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode) { - static const char * const names[] = { - [CXL_DECODER_NONE] = "none", - [CXL_DECODER_RAM] = "ram", - [CXL_DECODER_PMEM] = "pmem", - [CXL_DECODER_DC0] = "dc0", - [CXL_DECODER_DC1] = "dc1", - [CXL_DECODER_DC2] = "dc2", - [CXL_DECODER_DC3] = "dc3", - [CXL_DECODER_DC4] = "dc4", - [CXL_DECODER_DC5] = "dc5", - [CXL_DECODER_DC6] = "dc6", - [CXL_DECODER_DC7] = "dc7", - [CXL_DECODER_MIXED] = "mixed", - }; - if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED) - return names[mode]; + return cxl_decoder_mode_names[mode]; return "mixed"; }