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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6B274C56202 for ; Tue, 3 Nov 2020 14:35:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2518E223AC for ; Tue, 3 Nov 2020 14:35:55 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="MYu/Rtt3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728106AbgKCOfy (ORCPT ); Tue, 3 Nov 2020 09:35:54 -0500 Received: from mx2.suse.de ([195.135.220.15]:47298 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728256AbgKCOfc (ORCPT ); Tue, 3 Nov 2020 09:35:32 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1604414130; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=A6DblSDuoyZCKG+RlP90WV3mavoHS83Eo9uEYB8RoOo=; b=MYu/Rtt3FGFpjWn96fxWaWuNAo/h/KN7fDIzQJj4JSyhOp6SMqhZXvUYoYOzojW+Zixl+V yAKr3NooFVvU3ym0LYghuymmjI4dQEl6wNYzfB4FB6jX8mGT5j8/mxaKLEMn7iFVhe8hqV LhKCwOpLPTwLHpaNmWNEyPW5D2Q0clY= Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id D9EBDB2AC for ; Tue, 3 Nov 2020 14:35:29 +0000 (UTC) From: Juergen Gross To: stable@vger.kernel.org Subject: [PATCH v2 11/13] xen/events: use a common cpu hotplug hook for event channels Date: Tue, 3 Nov 2020 15:35:26 +0100 Message-Id: <20201103143528.22780-12-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201103143528.22780-1-jgross@suse.com> References: <20201103143528.22780-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org Today only fifo event channels have a cpu hotplug callback. In order to prepare for more percpu (de)init work move that callback into events_base.c and add percpu_init() and percpu_deinit() hooks to struct evtchn_ops. This is part of XSA-332. This is upstream commit 7beb290caa2adb0a399e735a1e175db9aae0523a Cc: stable@vger.kernel.org Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich Reviewed-by: Wei Liu --- drivers/xen/events/events_base.c | 25 ++++++++++++++++++ drivers/xen/events/events_fifo.c | 39 ++++++++++++++-------------- drivers/xen/events/events_internal.h | 3 +++ 3 files changed, 47 insertions(+), 20 deletions(-) diff --git a/drivers/xen/events/events_base.c b/drivers/xen/events/events_base.c index 2f076d6621b4..afcf2bf9845e 100644 --- a/drivers/xen/events/events_base.c +++ b/drivers/xen/events/events_base.c @@ -33,6 +33,7 @@ #include #include #include +#include #ifdef CONFIG_X86 #include @@ -1833,6 +1834,26 @@ void xen_callback_vector(void) {} static bool fifo_events = true; module_param(fifo_events, bool, 0); +static int xen_evtchn_cpu_prepare(unsigned int cpu) +{ + int ret = 0; + + if (evtchn_ops->percpu_init) + ret = evtchn_ops->percpu_init(cpu); + + return ret; +} + +static int xen_evtchn_cpu_dead(unsigned int cpu) +{ + int ret = 0; + + if (evtchn_ops->percpu_deinit) + ret = evtchn_ops->percpu_deinit(cpu); + + return ret; +} + void __init xen_init_IRQ(void) { int ret = -EINVAL; @@ -1842,6 +1863,10 @@ void __init xen_init_IRQ(void) if (ret < 0) xen_evtchn_2l_init(); + cpuhp_setup_state_nocalls(CPUHP_XEN_EVTCHN_PREPARE, + "CPUHP_XEN_EVTCHN_PREPARE", + xen_evtchn_cpu_prepare, xen_evtchn_cpu_dead); + evtchn_to_irq = kcalloc(EVTCHN_ROW(xen_evtchn_max_channels()), sizeof(*evtchn_to_irq), GFP_KERNEL); BUG_ON(!evtchn_to_irq); diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c index 970a5eb6dca4..2b98cdebacd6 100644 --- a/drivers/xen/events/events_fifo.c +++ b/drivers/xen/events/events_fifo.c @@ -386,21 +386,6 @@ static void evtchn_fifo_resume(void) event_array_pages = 0; } -static const struct evtchn_ops evtchn_ops_fifo = { - .max_channels = evtchn_fifo_max_channels, - .nr_channels = evtchn_fifo_nr_channels, - .setup = evtchn_fifo_setup, - .bind_to_cpu = evtchn_fifo_bind_to_cpu, - .clear_pending = evtchn_fifo_clear_pending, - .set_pending = evtchn_fifo_set_pending, - .is_pending = evtchn_fifo_is_pending, - .test_and_set_mask = evtchn_fifo_test_and_set_mask, - .mask = evtchn_fifo_mask, - .unmask = evtchn_fifo_unmask, - .handle_events = evtchn_fifo_handle_events, - .resume = evtchn_fifo_resume, -}; - static int evtchn_fifo_alloc_control_block(unsigned cpu) { void *control_block = NULL; @@ -423,19 +408,36 @@ static int evtchn_fifo_alloc_control_block(unsigned cpu) return ret; } -static int xen_evtchn_cpu_prepare(unsigned int cpu) +static int evtchn_fifo_percpu_init(unsigned int cpu) { if (!per_cpu(cpu_control_block, cpu)) return evtchn_fifo_alloc_control_block(cpu); return 0; } -static int xen_evtchn_cpu_dead(unsigned int cpu) +static int evtchn_fifo_percpu_deinit(unsigned int cpu) { __evtchn_fifo_handle_events(cpu, true); return 0; } +static const struct evtchn_ops evtchn_ops_fifo = { + .max_channels = evtchn_fifo_max_channels, + .nr_channels = evtchn_fifo_nr_channels, + .setup = evtchn_fifo_setup, + .bind_to_cpu = evtchn_fifo_bind_to_cpu, + .clear_pending = evtchn_fifo_clear_pending, + .set_pending = evtchn_fifo_set_pending, + .is_pending = evtchn_fifo_is_pending, + .test_and_set_mask = evtchn_fifo_test_and_set_mask, + .mask = evtchn_fifo_mask, + .unmask = evtchn_fifo_unmask, + .handle_events = evtchn_fifo_handle_events, + .resume = evtchn_fifo_resume, + .percpu_init = evtchn_fifo_percpu_init, + .percpu_deinit = evtchn_fifo_percpu_deinit, +}; + int __init xen_evtchn_fifo_init(void) { int cpu = get_cpu(); @@ -449,9 +451,6 @@ int __init xen_evtchn_fifo_init(void) evtchn_ops = &evtchn_ops_fifo; - cpuhp_setup_state_nocalls(CPUHP_XEN_EVTCHN_PREPARE, - "CPUHP_XEN_EVTCHN_PREPARE", - xen_evtchn_cpu_prepare, xen_evtchn_cpu_dead); out: put_cpu(); return ret; diff --git a/drivers/xen/events/events_internal.h b/drivers/xen/events/events_internal.h index 50c2050a1e32..980a56d51e4c 100644 --- a/drivers/xen/events/events_internal.h +++ b/drivers/xen/events/events_internal.h @@ -71,6 +71,9 @@ struct evtchn_ops { void (*handle_events)(unsigned cpu); void (*resume)(void); + + int (*percpu_init)(unsigned int cpu); + int (*percpu_deinit)(unsigned int cpu); }; extern const struct evtchn_ops *evtchn_ops; -- 2.26.2