From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0EB9B1F7541; Fri, 20 Feb 2026 19:54:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771617299; cv=none; b=nwTM/sVSXgJUE5jmHMAkj9AVo/qqfEKTjOYhIytxd2PonziHAYuoRAN4u2S9Oj+E76lplAldka7hAEO+xaehN89tG3Vu6YwLktBNf52UO51haOamkXmMRuhpOaAT9RAo476uznnz7zyXGels+t387+d4ybMdCPu/ZISc+M2Sb3k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771617299; c=relaxed/simple; bh=G8bBEO/g8w7OleXjDK76ZPJ7XfuuZF81p9PP5s2xJGw=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=UBBWuq4x+ni7HlvlNOkMEmZ3Vl/NaAAqrg/n3DzEz39clBXSxlRjhl4zwnA0DDu2SHSLD15mIZPeMpaT3T6uqGdcMmgdgd/gUvgl0JFBMYhjfnZYe2ynFmYu3iKxCntIgFxcMyvdU84V4OrWKaAwYO1wTckGcHWtSiu53jfN2rw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=EbWQ4DZr; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="EbWQ4DZr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4341C116C6; Fri, 20 Feb 2026 19:54:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771617298; bh=G8bBEO/g8w7OleXjDK76ZPJ7XfuuZF81p9PP5s2xJGw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EbWQ4DZrULRIpfj3CJM7KKV//fsDC8CLhHmiPL0HturNAqFKrFk527trkEU6xhW2f w3SwTGScz1OkFw/9wovoXiC5e/95USuL7WrS9naQxcnv9wrrTqtb/IlHaGMsSezJhm br/QmCkRWyndpOzfSqun5kQUylX2CtCuiuK7FT2+5dCG3hjC1sJ8nNnSFugHlLq2Ht TZ9igfItIvo0leyV6QSa6cea+Ij6FrmhLbopseM+g86V9TQ0DtTZ+E5I37+aJQhFf2 JxupJktMKVQw45FKa3v1BaBYGIxB1QcTI+GrKklrwf6jKjr3cLj4fTR2h2gbQPwZ4D COnH7NWf35U8g== Date: Fri, 20 Feb 2026 11:54:56 -0800 From: Drew Fustini To: yunhui cui Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Radim =?utf-8?B?S3LEjW3DocWZ?= , Samuel Holland , Adrien Ricciardi , Nicolas Pitre , Kornel =?utf-8?Q?Dul=C4=99ba?= , Atish Patra , Atish Kumar Patra , Vasudevan Srinivasan , Ved Shanbhogue , Chen Pei , Liu Zhiwei , Weiwei Li , guo.wenjia23@zte.com.cn, liu.qingtao2@zte.com.cn, Reinette Chatre , Tony Luck , Babu Moger , Peter Newman , Fenghua Yu , James Morse , Ben Horgan , Dave Martin , linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, x86@kernel.org, Rob Herring , "Rafael J. Wysocki" , Len Brown , Robert Moore , Sunil V L , Krzysztof Kozlowski , Conor Dooley , Paul Walmsley , linux-acpi@vger.kernel.org, acpica-devel@lists.linux.dev, devicetree@vger.kernel.org Subject: Re: [External] [PATCH RFC v2 08/17] RISC-V: QoS: add resctrl interface for CBQRI controllers Message-ID: References: <20260128-ssqosid-cbqri-v2-0-dca586b091b9@kernel.org> <20260128-ssqosid-cbqri-v2-8-dca586b091b9@kernel.org> Precedence: bulk X-Mailing-List: acpica-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Mon, Feb 02, 2026 at 12:12:28PM +0800, yunhui cui wrote: > Hi Drew, Hi, thanks for your review, sorry I had this reply in draft for awhile and failed to actually send it. All good points from you and I've been working on fixing up the code. > On Thu, Jan 29, 2026 at 4:28 AM Drew Fustini wrote: > > > > Add interface for CBQRI controller drivers to make use of the resctrl > > filesystem. > > > > Co-developed-by: Adrien Ricciardi > > Signed-off-by: Adrien Ricciardi > > Signed-off-by: Drew Fustini > > --- > > arch/riscv/kernel/qos/qos_resctrl.c | 1192 +++++++++++++++++++++++++++++++++++ > > 1 file changed, 1192 insertions(+) > > > > diff --git a/arch/riscv/kernel/qos/qos_resctrl.c b/arch/riscv/kernel/qos/qos_resctrl.c > > new file mode 100644 > > index 000000000000..d500098599d2 > > --- /dev/null > > +++ b/arch/riscv/kernel/qos/qos_resctrl.c > > @@ -0,0 +1,1192 @@ > > +// SPDX-License-Identifier: GPL-2.0-only > > + > > +#define pr_fmt(fmt) "qos: resctrl: " fmt > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include "internal.h" > > + > > +#define MAX_CONTROLLERS 6 > > +static struct cbqri_controller controllers[MAX_CONTROLLERS]; > > Switch to dynamic allocation? Remove MAX_CONTROLLERS. Yes, I am reworking the implementation to dynamically allocate the cbqri_controller array based on the number of controllers actually in the system. > > +int resctrl_arch_rmid_read(struct rdt_resource *r, struct rdt_mon_domain *d, > > + u32 closid, u32 rmid, enum resctrl_event_id eventid, > > + u64 *val, void *arch_mon_ctx) > > +{ > > + /* > > + * The current Qemu implementation of CBQRI capacity and bandwidth > > + * controllers do not emulate the utilization of resources over > > + * time. Therefore, Qemu currently sets the invalid bit in > > + * cc_mon_ctr_val and bc_mon_ctr_val, and there is no meaningful > > + * value other than 0 to return for reading an RMID (e.g. MCID in > > + * CBQRI terminology) > > + */ > > + > > + return 0; > > Implement per the spec's description directly, not as this comment states? Good point that this should actually perform the operation to read the value, even if Qemu is just setting the invalid bit as there is no real value implemented in Qemu. > > +/* > > + * Note: for the purposes of the CBQRI proof-of-concept, debug logging > > + * has been left in this function that detects the properties of CBQRI > > + * capable controllers in the system. pr_info calls would be removed > > + * before submitting non-RFC patches. > > + */ > > +static int cbqri_probe_controller(struct cbqri_controller_info *ctrl_info, > > + struct cbqri_controller *ctrl) > > +{ > > + int err = 0, status; > > + u64 reg; > > + > > + pr_info("controller info: type=%d addr=0x%lx size=%lu max-rcid=%u max-mcid=%u", > > + ctrl_info->type, ctrl_info->addr, ctrl_info->size, > > + ctrl_info->rcid_count, ctrl_info->mcid_count); > > + > > + /* max_rmid is used by resctrl_arch_system_num_rmid_idx() */ > > + max_rmid = ctrl_info->mcid_count; > > Get the min of all controllers? Yes, I will change the logic to do that. > > +static int qos_init_domain_ctrlval(struct rdt_resource *r, struct rdt_ctrl_domain *d) > > +{ > > + struct cbqri_resctrl_res *hw_res; > > + struct cbqri_resctrl_dom *hw_dom; > > + u64 *dc; > > + int err = 0; > > + int i; > > + > > + hw_res = container_of(r, struct cbqri_resctrl_res, resctrl_res); > > + if (!hw_res) > > + return -ENOMEM; > > + > > + hw_dom = container_of(d, struct cbqri_resctrl_dom, resctrl_ctrl_dom); > > + if (!hw_dom) > > + return -ENOMEM; > > + > > + dc = kmalloc_array(hw_res->max_rcid, sizeof(*hw_dom->ctrl_val), > > + GFP_KERNEL); > > + if (!dc) > > + return -ENOMEM; > > + > > + hw_dom->ctrl_val = dc; > > + > > + for (i = 0; i < hw_res->max_rcid; i++, dc++) { > > + err = resctrl_arch_update_one(r, d, i, 0, resctrl_get_default_ctrl(r)); > > + if (err) > > + return 0; > > return 0 ? Ah, yes, I will update to return error instead of silencing it. > > +static int qos_resctrl_add_controller_domain(struct cbqri_controller *ctrl, int *id) > > +{ > > + struct rdt_ctrl_domain *domain = NULL; > > + struct cbqri_resctrl_res *cbqri_res = NULL; > > + struct rdt_resource *res = NULL; > > + int internal_id = *id; > > + int err = 0; > > + > > + domain = qos_new_domain(ctrl); > > + if (!domain) > > + return -ENOSPC; > > + if (ctrl->ctrl_info->type == CBQRI_CONTROLLER_TYPE_CAPACITY) { > > + cpumask_copy(&domain->hdr.cpu_mask, &ctrl->ctrl_info->cache.cpu_mask); > > + if (ctrl->ctrl_info->cache.cache_level == 2) { > > + cbqri_res = &cbqri_resctrl_resources[RDT_RESOURCE_L2]; > > + cbqri_res->max_rcid = ctrl->ctrl_info->rcid_count; > > + cbqri_res->max_mcid = ctrl->ctrl_info->mcid_count; > > + res = &cbqri_res->resctrl_res; > > + res->mon.num_rmid = ctrl->ctrl_info->mcid_count; > > + res->rid = RDT_RESOURCE_L2; > > + res->name = "L2"; > > + res->alloc_capable = ctrl->alloc_capable; > > + res->mon_capable = ctrl->mon_capable; > > + res->schema_fmt = RESCTRL_SCHEMA_BITMAP; > > + res->ctrl_scope = RESCTRL_L2_CACHE; > > + res->cache.arch_has_sparse_bitmasks = false; > > + res->cache.arch_has_per_cpu_cfg = false; > > + res->cache.cbm_len = ctrl->cc.ncblks; > > + res->cache.shareable_bits = resctrl_get_default_ctrl(res); > > + res->cache.min_cbm_bits = 1; > > + } else if (ctrl->ctrl_info->cache.cache_level == 3) { > > + cbqri_res = &cbqri_resctrl_resources[RDT_RESOURCE_L3]; > > + cbqri_res->max_rcid = ctrl->ctrl_info->rcid_count; > > + cbqri_res->max_mcid = ctrl->ctrl_info->mcid_count; > > + res = &cbqri_res->resctrl_res; > > + res->mon.num_rmid = ctrl->ctrl_info->mcid_count; > > + res->rid = RDT_RESOURCE_L3; > > + res->name = "L3"; > > + res->schema_fmt = RESCTRL_SCHEMA_BITMAP; > > + res->ctrl_scope = RESCTRL_L3_CACHE; > > + res->alloc_capable = ctrl->alloc_capable; > > + res->mon_capable = ctrl->mon_capable; > > + res->cache.arch_has_sparse_bitmasks = false; > > + res->cache.arch_has_per_cpu_cfg = false; > > + res->cache.cbm_len = ctrl->cc.ncblks; > > + res->cache.shareable_bits = resctrl_get_default_ctrl(res); > > + res->cache.min_cbm_bits = 1; > > + } else { > > + pr_warn("%s(): unknown cache level %d", __func__, > > + ctrl->ctrl_info->cache.cache_level); > > + err = -ENODEV; > > + goto err_free_domain; > > + } > > + } else if (ctrl->ctrl_info->type == CBQRI_CONTROLLER_TYPE_BANDWIDTH) { > > + if (ctrl->alloc_capable) { > > + cbqri_res = &cbqri_resctrl_resources[RDT_RESOURCE_MBA]; > > + cbqri_res->max_rcid = ctrl->ctrl_info->rcid_count; > > + cbqri_res->max_mcid = ctrl->ctrl_info->mcid_count; > > + res = &cbqri_res->resctrl_res; > > + res->mon.num_rmid = ctrl->ctrl_info->mcid_count; > > + res->rid = RDT_RESOURCE_MBA; > > + res->name = "MB"; > > + res->schema_fmt = RESCTRL_SCHEMA_RANGE; > > + res->ctrl_scope = RESCTRL_L3_CACHE; > > + res->alloc_capable = ctrl->alloc_capable; > > + res->mon_capable = false; > > + res->membw.delay_linear = true; > > + res->membw.arch_needs_linear = true; > > + res->membw.throttle_mode = THREAD_THROTTLE_UNDEFINED; > > + // The minimum percentage allowed by the CBQRI spec > > + res->membw.min_bw = 1; > > + // The maximum percentage allowed by the CBQRI spec > > + res->membw.max_bw = 80; > > + res->membw.bw_gran = 1; > > + } > > Wrap a function. I am guessing you mean to break up this long function into a couple of smaller functions? I will give that a try for the next rev. > > + } else { > > + pr_warn("%s(): unknown resource %d", __func__, ctrl->ctrl_info->type); > > + err = -ENODEV; > > + goto err_free_domain; > > + } > > + > > + domain->hdr.id = internal_id; > > + err = qos_init_domain_ctrlval(res, domain); > > + if (err) > > + goto err_free_domain; > > + > > + if (cbqri_res) { > > + list_add_tail(&domain->hdr.list, &cbqri_res->resctrl_res.ctrl_domains); > > + *id = internal_id; > > + err = resctrl_online_ctrl_domain(res, domain); > > + if (err) { > > + pr_warn("%s(): failed to online cbqri_res domain", __func__); > > + goto err_free_domain; > > + } > > + } > > + > > + return 0; > > + > > +err_free_domain: > > + pr_warn("%s(): err_free_domain", __func__); > > + kfree(container_of(domain, struct cbqri_resctrl_dom, resctrl_ctrl_dom)); > > free hw_dom->ctrl_val ？ I'll take a closer look at the error cleanup path and fix in the next rev. Thanks, Drew From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 2F77AC5AE49 for ; Fri, 20 Feb 2026 19:55:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qVILohPQaEEwOiNbCctGXTe/wzUfFw9GKcBYa9DqoVw=; b=oHIXyENfAHSNSV CH2jW2WKq3s9v5EsrpZm6o+kq/GLpsb61M2rTK45ztcOeGBt+Y/1tBVUInP9ukOqPRFs0F3xeEo7N xcKN8KTkQk9mZfQnZCWfuBtb0udw6iLibZGuc08IK62yL+mhWGNGccqOO+JCLcZt5Q4AvHYfG9Cch AQe/z7TPB4Mwyvzpde1q9pQGjICXA7Lile3W9/qd+J4TKdQ/XHoRyovWKR/w+toZIyF1U66wD9WmF h2JJ4YumYhg0+tQOZrCOIkBiKLuup9MQ2v2A8hhw3xBzLhDJlmgHgDlQuIhNtxD8yBX3DCWDRPBO6 hwX0jDgxGnwi1SdGXmEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vtWac-0000000FXbv-48a6; Fri, 20 Feb 2026 19:55:02 +0000 Received: from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vtWaa-0000000FXb9-3lcm for linux-riscv@lists.infradead.org; Fri, 20 Feb 2026 19:55:02 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id D6DA743A15; Fri, 20 Feb 2026 19:54:58 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4341C116C6; Fri, 20 Feb 2026 19:54:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771617298; bh=G8bBEO/g8w7OleXjDK76ZPJ7XfuuZF81p9PP5s2xJGw=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=EbWQ4DZrULRIpfj3CJM7KKV//fsDC8CLhHmiPL0HturNAqFKrFk527trkEU6xhW2f w3SwTGScz1OkFw/9wovoXiC5e/95USuL7WrS9naQxcnv9wrrTqtb/IlHaGMsSezJhm br/QmCkRWyndpOzfSqun5kQUylX2CtCuiuK7FT2+5dCG3hjC1sJ8nNnSFugHlLq2Ht TZ9igfItIvo0leyV6QSa6cea+Ij6FrmhLbopseM+g86V9TQ0DtTZ+E5I37+aJQhFf2 JxupJktMKVQw45FKa3v1BaBYGIxB1QcTI+GrKklrwf6jKjr3cLj4fTR2h2gbQPwZ4D COnH7NWf35U8g== Date: Fri, 20 Feb 2026 11:54:56 -0800 From: Drew Fustini To: yunhui cui Subject: Re: [External] [PATCH RFC v2 08/17] RISC-V: QoS: add resctrl interface for CBQRI controllers Message-ID: References: <20260128-ssqosid-cbqri-v2-0-dca586b091b9@kernel.org> <20260128-ssqosid-cbqri-v2-8-dca586b091b9@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260220_115500_982425_0CDDB9CC X-CRM114-Status: GOOD ( 35.78 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Atish Patra , Adrien Ricciardi , Atish Kumar Patra , Conor Dooley , Nicolas Pitre , devicetree@vger.kernel.org, Liu Zhiwei , guo.wenjia23@zte.com.cn, linux-riscv@lists.infradead.org, Rob Herring , Peter Newman , x86@kernel.org, acpica-devel@lists.linux.dev, Robert Moore , liu.qingtao2@zte.com.cn, linux-acpi@vger.kernel.org, Ben Horgan , James Morse , Radim =?utf-8?B?S3LEjW3DocWZ?= , Dave Martin , Len Brown , Fenghua Yu , Chen Pei , Albert Ou , Kornel =?utf-8?Q?Dul=C4=99ba?= , Babu Moger , Weiwei Li , Paul Walmsley , Ved Shanbhogue , Reinette Chatre , Vasudevan Srinivasan , Tony Luck , Alexandre Ghiti , linux-kernel@vger.kernel.org, Samuel Holland , Krzysztof Kozlowski , Palmer Dabbelt , "Rafael J. Wysocki" , Paul Walmsley Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org T24gTW9uLCBGZWIgMDIsIDIwMjYgYXQgMTI6MTI6MjhQTSArMDgwMCwgeXVuaHVpIGN1aSB3cm90 ZToKPiBIaSBEcmV3LAoKSGksIHRoYW5rcyBmb3IgeW91ciByZXZpZXcsIHNvcnJ5IEkgaGFkIHRo aXMgcmVwbHkgaW4gZHJhZnQgZm9yIGF3aGlsZQphbmQgZmFpbGVkIHRvIGFjdHVhbGx5IHNlbmQg aXQuIEFsbCBnb29kIHBvaW50cyBmcm9tIHlvdSBhbmQgSSd2ZSBiZWVuCndvcmtpbmcgb24gZml4 aW5nIHVwIHRoZSBjb2RlLgoKPiBPbiBUaHUsIEphbiAyOSwgMjAyNiBhdCA0OjI44oCvQU0gRHJl dyBGdXN0aW5pIDxmdXN0aW5pQGtlcm5lbC5vcmc+IHdyb3RlOgo+ID4KPiA+IEFkZCBpbnRlcmZh Y2UgZm9yIENCUVJJIGNvbnRyb2xsZXIgZHJpdmVycyB0byBtYWtlIHVzZSBvZiB0aGUgcmVzY3Ry bAo+ID4gZmlsZXN5c3RlbS4KPiA+Cj4gPiBDby1kZXZlbG9wZWQtYnk6IEFkcmllbiBSaWNjaWFy ZGkgPGFyaWNjaWFyZGlAYmF5bGlicmUuY29tPgo+ID4gU2lnbmVkLW9mZi1ieTogQWRyaWVuIFJp Y2NpYXJkaSA8YXJpY2NpYXJkaUBiYXlsaWJyZS5jb20+Cj4gPiBTaWduZWQtb2ZmLWJ5OiBEcmV3 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