From patchwork Wed Apr 10 18:25:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Haitao Huang X-Patchwork-Id: 13624981 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (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 CC01B1802B6; Wed, 10 Apr 2024 18:26:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712773563; cv=none; b=eQqxrwYk+KBq64uFBY11qzokwsPpSYW0t8VTSnzA0UpZ3W79cVtDysQ0oqhcdAciLw+aKO7DvEwmAOKCsV3oYZ+qrADJshX77elhDXSmGSVRKXIKR25qygyg0bRrfdo5FKTt1Dy0VDIPXmZPtBqQMmrP9O+obO+sL+vdyT0h9kM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712773563; c=relaxed/simple; bh=5XKMm7iAyk+4jHOl9eoo4wXlJ4GqFGrkqvRn/fGe17o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=hc6iMf8LVrE47s2FonSGZeBURy9rm+iGQVJQvcjx2i+Zk5Stg5xbeEI6y4Tn2j3bijYUfPA1bGRKnKRTesD128OvMwo4V81rijWe9CxBucqxWp93rtGNwVQvMBLzQe37k8TRfv3uHeHVRRR9gDXv3mUz9mWK4Ixy1S2CUYUntHo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=none smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=dzWOfNaV; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="dzWOfNaV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1712773562; x=1744309562; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=5XKMm7iAyk+4jHOl9eoo4wXlJ4GqFGrkqvRn/fGe17o=; b=dzWOfNaV87UvUhtClKu7fVIAKBgOTEc9uqjWtGyVC35WRSqtZrGR4wlY GYXhjTOI8LgvZ/SexlhueTDDq3dhOp7dKPJuSlM2faHZRrYvw3buKU8U8 avsHQB30CcCtTHvz406f5DPE/FRius0i5D2IhQ/wJ6cUeKj0bQ8fgL/CT v4ugUZVwEkQCSutJA7H+q3zhF5PyH0WMBNcYaS/0SMD5VOcfsGzfSg8qw jyZPEtzWqw/Od9Z8P5vi8Rr2Ah/SWWbU20J1F8Zacwsbgq9kMYmFCoOAD DKY+z2eWy6/dArReZ1zLoxAFw1VnS5LKP2LoAWkL/1lxp7OVWyTFwePjd A==; X-CSE-ConnectionGUID: j4MKBZb+RAOsneI6CGB77w== X-CSE-MsgGUID: 9v+uVPseTASobNd6pWX9dw== X-IronPort-AV: E=McAfee;i="6600,9927,11039"; a="19583644" X-IronPort-AV: E=Sophos;i="6.07,191,1708416000"; d="scan'208";a="19583644" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2024 11:25:59 -0700 X-CSE-ConnectionGUID: wrNqpSe3RheEcvSbX+Tjyg== X-CSE-MsgGUID: 5XBkxB8TRfqYRRT6whGbEg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.07,191,1708416000"; d="scan'208";a="21232408" Received: from b4969161e530.jf.intel.com ([10.165.56.46]) by orviesa008.jf.intel.com with ESMTP; 10 Apr 2024 11:25:58 -0700 From: Haitao Huang To: jarkko@kernel.org, dave.hansen@linux.intel.com, kai.huang@intel.com, tj@kernel.org, mkoutny@suse.com, linux-kernel@vger.kernel.org, linux-sgx@vger.kernel.org, x86@kernel.org, cgroups@vger.kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, sohil.mehta@intel.com, tim.c.chen@linux.intel.com Cc: zhiquan1.li@intel.com, kristen@linux.intel.com, seanjc@google.com, zhanb@microsoft.com, anakrish@microsoft.com, mikko.ylinen@linux.intel.com, yangjie@microsoft.com, chrisyan@microsoft.com Subject: [PATCH v11 02/14] cgroup/misc: Add per resource callbacks for CSS events Date: Wed, 10 Apr 2024 11:25:46 -0700 Message-Id: <20240410182558.41467-3-haitao.huang@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240410182558.41467-1-haitao.huang@linux.intel.com> References: <20240410182558.41467-1-haitao.huang@linux.intel.com> Precedence: bulk X-Mailing-List: linux-sgx@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Kristen Carlson Accardi The misc cgroup controller (subsystem) currently does not perform resource type specific action for Cgroups Subsystem State (CSS) events: the 'css_alloc' event when a cgroup is created and the 'css_free' event when a cgroup is destroyed. Define callbacks for those events and allow resource providers to register the callbacks per resource type as needed. This will be utilized later by the EPC misc cgroup support implemented in the SGX driver. Signed-off-by: Kristen Carlson Accardi Co-developed-by: Haitao Huang Signed-off-by: Haitao Huang Reviewed-by: Jarkko Sakkinen Reviewed-by: Tejun Heo Reviewed-by: Kai Huang --- V8: - Abstract out _misc_cg_res_free() and _misc_cg_res_alloc() (Jarkko) V7: - Make ops one per resource type and store them in array (Michal) - Rename the ops struct to misc_res_ops, and enforce the constraints of required callback functions (Jarkko) - Moved addition of priv field to patch 4 where it was used first. (Jarkko) V6: - Create ops struct for per resource callbacks (Jarkko) - Drop max_write callback (Dave, Michal) - Style fixes (Kai) --- include/linux/misc_cgroup.h | 11 +++++ kernel/cgroup/misc.c | 84 +++++++++++++++++++++++++++++++++---- 2 files changed, 87 insertions(+), 8 deletions(-) diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h index e799b1f8d05b..0806d4436208 100644 --- a/include/linux/misc_cgroup.h +++ b/include/linux/misc_cgroup.h @@ -27,6 +27,16 @@ struct misc_cg; #include +/** + * struct misc_res_ops: per resource type callback ops. + * @alloc: invoked for resource specific initialization when cgroup is allocated. + * @free: invoked for resource specific cleanup when cgroup is deallocated. + */ +struct misc_res_ops { + int (*alloc)(struct misc_cg *cg); + void (*free)(struct misc_cg *cg); +}; + /** * struct misc_res: Per cgroup per misc type resource * @max: Maximum limit on the resource. @@ -56,6 +66,7 @@ struct misc_cg { u64 misc_cg_res_total_usage(enum misc_res_type type); int misc_cg_set_capacity(enum misc_res_type type, u64 capacity); +int misc_cg_set_ops(enum misc_res_type type, const struct misc_res_ops *ops); int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg, u64 amount); void misc_cg_uncharge(enum misc_res_type type, struct misc_cg *cg, u64 amount); diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c index 79a3717a5803..14ab13ef3bc7 100644 --- a/kernel/cgroup/misc.c +++ b/kernel/cgroup/misc.c @@ -39,6 +39,9 @@ static struct misc_cg root_cg; */ static u64 misc_res_capacity[MISC_CG_RES_TYPES]; +/* Resource type specific operations */ +static const struct misc_res_ops *misc_res_ops[MISC_CG_RES_TYPES]; + /** * parent_misc() - Get the parent of the passed misc cgroup. * @cgroup: cgroup whose parent needs to be fetched. @@ -105,6 +108,36 @@ int misc_cg_set_capacity(enum misc_res_type type, u64 capacity) } EXPORT_SYMBOL_GPL(misc_cg_set_capacity); +/** + * misc_cg_set_ops() - set resource specific operations. + * @type: Type of the misc res. + * @ops: Operations for the given type. + * + * Context: Any context. + * Return: + * * %0 - Successfully registered the operations. + * * %-EINVAL - If @type is invalid, or the operations missing any required callbacks. + */ +int misc_cg_set_ops(enum misc_res_type type, const struct misc_res_ops *ops) +{ + if (!valid_type(type)) + return -EINVAL; + + if (!ops->alloc) { + pr_err("%s: alloc missing\n", __func__); + return -EINVAL; + } + + if (!ops->free) { + pr_err("%s: free missing\n", __func__); + return -EINVAL; + } + + misc_res_ops[type] = ops; + return 0; +} +EXPORT_SYMBOL_GPL(misc_cg_set_ops); + /** * misc_cg_cancel_charge() - Cancel the charge from the misc cgroup. * @type: Misc res type in misc cg to cancel the charge from. @@ -371,6 +404,33 @@ static struct cftype misc_cg_files[] = { {} }; +static inline int _misc_cg_res_alloc(struct misc_cg *cg) +{ + enum misc_res_type i; + int ret; + + for (i = 0; i < MISC_CG_RES_TYPES; i++) { + WRITE_ONCE(cg->res[i].max, MAX_NUM); + atomic64_set(&cg->res[i].usage, 0); + if (misc_res_ops[i]) { + ret = misc_res_ops[i]->alloc(cg); + if (ret) + return ret; + } + } + + return 0; +} + +static inline void _misc_cg_res_free(struct misc_cg *cg) +{ + enum misc_res_type i; + + for (i = 0; i < MISC_CG_RES_TYPES; i++) + if (misc_res_ops[i]) + misc_res_ops[i]->free(cg); +} + /** * misc_cg_alloc() - Allocate misc cgroup. * @parent_css: Parent cgroup. @@ -383,20 +443,25 @@ static struct cftype misc_cg_files[] = { static struct cgroup_subsys_state * misc_cg_alloc(struct cgroup_subsys_state *parent_css) { - enum misc_res_type i; - struct misc_cg *cg; + struct misc_cg *parent_cg, *cg; + int ret; - if (!parent_css) { - cg = &root_cg; + if (unlikely(!parent_css)) { + parent_cg = cg = &root_cg; } else { cg = kzalloc(sizeof(*cg), GFP_KERNEL); if (!cg) return ERR_PTR(-ENOMEM); + parent_cg = css_misc(parent_css); } - for (i = 0; i < MISC_CG_RES_TYPES; i++) { - WRITE_ONCE(cg->res[i].max, MAX_NUM); - atomic64_set(&cg->res[i].usage, 0); + ret = _misc_cg_res_alloc(cg); + if (ret) { + _misc_cg_res_free(cg); + if (likely(parent_css)) + kfree(cg); + + return ERR_PTR(ret); } return &cg->css; @@ -410,7 +475,10 @@ misc_cg_alloc(struct cgroup_subsys_state *parent_css) */ static void misc_cg_free(struct cgroup_subsys_state *css) { - kfree(css_misc(css)); + struct misc_cg *cg = css_misc(css); + + _misc_cg_res_free(cg); + kfree(cg); } /* Cgroup controller callbacks */