linux-kernel - Re: [PATCH v16 05/16] x86/sgx: Implement basic EPC misc cgroup functionality

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Message-ID: <ec3b451f727493fea87298e70aba7c281ca920d4.camel@intel.com>
Date: Tue, 27 Aug 2024 10:21:09 +0000
From: "Huang, Kai" <kai.huang@...el.com>
To: "chenridong@...wei.com" <chenridong@...wei.com>,
	"linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
	"cgroups@...r.kernel.org" <cgroups@...r.kernel.org>, "mkoutny@...e.com"
	<mkoutny@...e.com>, "dave.hansen@...ux.intel.com"
	<dave.hansen@...ux.intel.com>, "haitao.huang@...ux.intel.com"
	<haitao.huang@...ux.intel.com>, "tim.c.chen@...ux.intel.com"
	<tim.c.chen@...ux.intel.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "mingo@...hat.com" <mingo@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>, "tj@...nel.org" <tj@...nel.org>,
	"jarkko@...nel.org" <jarkko@...nel.org>, "Mehta, Sohil"
	<sohil.mehta@...el.com>, "hpa@...or.com" <hpa@...or.com>, "bp@...en8.de"
	<bp@...en8.de>, "x86@...nel.org" <x86@...nel.org>
CC: "mikko.ylinen@...ux.intel.com" <mikko.ylinen@...ux.intel.com>,
	"seanjc@...gle.com" <seanjc@...gle.com>, "anakrish@...rosoft.com"
	<anakrish@...rosoft.com>, "Zhang, Bo" <zhanb@...rosoft.com>,
	"kristen@...ux.intel.com" <kristen@...ux.intel.com>, "yangjie@...rosoft.com"
	<yangjie@...rosoft.com>, "Li, Zhiquan1" <zhiquan1.li@...el.com>,
	"chrisyan@...rosoft.com" <chrisyan@...rosoft.com>
Subject: Re: [PATCH v16 05/16] x86/sgx: Implement basic EPC misc cgroup
 functionality

On Tue, 2024-08-20 at 18:53 -0700, Haitao Huang wrote:
> +/**
> + * Register capacity and ops for SGX cgroup.
> + * Only called at the end of sgx_init() when SGX is ready to handle the ops
> + * callbacks.
> + */

Got this warning when building with W=1:

arch/x86/kernel/cpu/sgx/epc_cgroup.c:420: warning: This comment starts with
'/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-
doc.rst
 * Register capacity and ops for SGX cgroup.

It should be fixed.

> +void __init sgx_cgroup_register(void)
> +{
> +	unsigned int nid = first_node(sgx_numa_mask);
> +	unsigned int first = nid;
> +	u64 capacity = 0;
> +
> +	misc_cg_set_ops(MISC_CG_RES_SGX_EPC, &sgx_cgroup_ops);
> +
> +	/* sgx_numa_mask is not empty when this is called */
> +	do {
> +		capacity += sgx_numa_nodes[nid].size;
> +		nid = next_node_in(nid, sgx_numa_mask);
> +	} while (nid != first);
> +	misc_cg_set_capacity(MISC_CG_RES_SGX_EPC, capacity);
> +}

Nit (leave to you):

Is sgx_cgroup_enable() better?