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Tue, 02 Jun 2020 04:31:43 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22036.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 0524VgCG16188330 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 2 Jun 2020 04:31:42 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8CC16AC060; Tue, 2 Jun 2020 04:31:42 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4E204AC05E; Tue, 2 Jun 2020 04:31:42 +0000 (GMT) Received: from localhost (unknown [9.160.98.233]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 2 Jun 2020 04:31:42 +0000 (GMT) From: Nathan Lynch To: linuxppc-dev@lists.ozlabs.org Subject: [PATCH 2/2] powerpc/rtas: don't online CPUs for partition suspend Date: Mon, 1 Jun 2020 23:31:40 -0500 Message-Id: <20200602043140.397746-3-nathanl@linux.ibm.com> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20200602043140.397746-1-nathanl@linux.ibm.com> References: <20200602043140.397746-1-nathanl@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-02_04:2020-06-01, 2020-06-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 suspectscore=3 mlxlogscore=999 clxscore=1015 spamscore=0 cotscore=-2147483648 adultscore=0 priorityscore=1501 impostorscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006020023 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: svaidy@linux.vnet.ibm.com, npiggin@gmail.com, ego@linux.vnet.ibm.com Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Partition suspension, used for hibernation and migration, requires that the OS place all but one of the LPAR's processor threads into one of two states prior to calling the ibm,suspend-me RTAS function: * the architected offline state (via RTAS stop-self); or * the H_JOIN hcall, which does not return until the partition resumes execution Using H_CEDE as the offline mode, introduced by commit 3aa565f53c39 ("powerpc/pseries: Add hooks to put the CPU into an appropriate offline state"), means that any threads which are offline from Linux's point of view must be moved to one of those two states before a partition suspension can proceed. This was eventually addressed in commit 120496ac2d2d ("powerpc: Bring all threads online prior to migration/hibernation"), which added code to temporarily bring up any offline processor threads so they can call H_JOIN. Conceptually this is fine, but the implementation has had multiple races with cpu hotplug operations initiated from user space[1][2][3], the error handling is fragile, and it generates user-visible cpu hotplug events which is a lot of noise for a platform feature that's supposed to minimize disruption to workloads. With commit 3aa565f53c39 ("powerpc/pseries: Add hooks to put the CPU into an appropriate offline state") reverted, this code becomes unnecessary, so remove it. Since any offline CPUs now are truly offline from the platform's point of view, it is no longer necessary to bring up CPUs only to have them call H_JOIN and then go offline again upon resuming. Only active threads are required to call H_JOIN; stopped threads can be left alone. [1] commit a6717c01ddc2 ("powerpc/rtas: use device model APIs and serialization during LPM") [2] commit 9fb603050ffd ("powerpc/rtas: retry when cpu offline races with suspend/migration") [3] commit dfd718a2ed1f ("powerpc/rtas: Fix a potential race between CPU-Offline & Migration") Fixes: 120496ac2d2d ("powerpc: Bring all threads online prior to migration/hibernation") Signed-off-by: Nathan Lynch --- arch/powerpc/include/asm/rtas.h | 2 - arch/powerpc/kernel/rtas.c | 122 +---------------------- arch/powerpc/platforms/pseries/suspend.c | 22 +--- 3 files changed, 3 insertions(+), 143 deletions(-) diff --git a/arch/powerpc/include/asm/rtas.h b/arch/powerpc/include/asm/rtas.h index 3c1887351c71..bd227e0eab07 100644 --- a/arch/powerpc/include/asm/rtas.h +++ b/arch/powerpc/include/asm/rtas.h @@ -368,8 +368,6 @@ extern int rtas_set_indicator_fast(int indicator, int index, int new_value); extern void rtas_progress(char *s, unsigned short hex); extern int rtas_suspend_cpu(struct rtas_suspend_me_data *data); extern int rtas_suspend_last_cpu(struct rtas_suspend_me_data *data); -extern int rtas_online_cpus_mask(cpumask_var_t cpus); -extern int rtas_offline_cpus_mask(cpumask_var_t cpus); extern int rtas_ibm_suspend_me(u64 handle); struct rtc_time; diff --git a/arch/powerpc/kernel/rtas.c b/arch/powerpc/kernel/rtas.c index c5fa251b8950..01210593d60c 100644 --- a/arch/powerpc/kernel/rtas.c +++ b/arch/powerpc/kernel/rtas.c @@ -842,96 +842,6 @@ static void rtas_percpu_suspend_me(void *info) __rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1); } -enum rtas_cpu_state { - DOWN, - UP, -}; - -#ifndef CONFIG_SMP -static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, - cpumask_var_t cpus) -{ - if (!cpumask_empty(cpus)) { - cpumask_clear(cpus); - return -EINVAL; - } else - return 0; -} -#else -/* On return cpumask will be altered to indicate CPUs changed. - * CPUs with states changed will be set in the mask, - * CPUs with status unchanged will be unset in the mask. */ -static int rtas_cpu_state_change_mask(enum rtas_cpu_state state, - cpumask_var_t cpus) -{ - int cpu; - int cpuret = 0; - int ret = 0; - - if (cpumask_empty(cpus)) - return 0; - - for_each_cpu(cpu, cpus) { - struct device *dev = get_cpu_device(cpu); - - switch (state) { - case DOWN: - cpuret = device_offline(dev); - break; - case UP: - cpuret = device_online(dev); - break; - } - if (cpuret < 0) { - pr_debug("%s: cpu_%s for cpu#%d returned %d.\n", - __func__, - ((state == UP) ? "up" : "down"), - cpu, cpuret); - if (!ret) - ret = cpuret; - if (state == UP) { - /* clear bits for unchanged cpus, return */ - cpumask_shift_right(cpus, cpus, cpu); - cpumask_shift_left(cpus, cpus, cpu); - break; - } else { - /* clear bit for unchanged cpu, continue */ - cpumask_clear_cpu(cpu, cpus); - } - } - cond_resched(); - } - - return ret; -} -#endif - -int rtas_online_cpus_mask(cpumask_var_t cpus) -{ - int ret; - - ret = rtas_cpu_state_change_mask(UP, cpus); - - if (ret) { - cpumask_var_t tmp_mask; - - if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL)) - return ret; - - /* Use tmp_mask to preserve cpus mask from first failure */ - cpumask_copy(tmp_mask, cpus); - rtas_offline_cpus_mask(tmp_mask); - free_cpumask_var(tmp_mask); - } - - return ret; -} - -int rtas_offline_cpus_mask(cpumask_var_t cpus) -{ - return rtas_cpu_state_change_mask(DOWN, cpus); -} - int rtas_ibm_suspend_me(u64 handle) { long state; @@ -939,8 +849,6 @@ int rtas_ibm_suspend_me(u64 handle) unsigned long retbuf[PLPAR_HCALL_BUFSIZE]; struct rtas_suspend_me_data data; DECLARE_COMPLETION_ONSTACK(done); - cpumask_var_t offline_mask; - int cpuret; if (!rtas_service_present("ibm,suspend-me")) return -ENOSYS; @@ -961,9 +869,6 @@ int rtas_ibm_suspend_me(u64 handle) return -EIO; } - if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL)) - return -ENOMEM; - atomic_set(&data.working, 0); atomic_set(&data.done, 0); atomic_set(&data.error, 0); @@ -972,24 +877,8 @@ int rtas_ibm_suspend_me(u64 handle) lock_device_hotplug(); - /* All present CPUs must be online */ - cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask); - cpuret = rtas_online_cpus_mask(offline_mask); - if (cpuret) { - pr_err("%s: Could not bring present CPUs online.\n", __func__); - atomic_set(&data.error, cpuret); - goto out; - } - cpu_hotplug_disable(); - /* Check if we raced with a CPU-Offline Operation */ - if (!cpumask_equal(cpu_present_mask, cpu_online_mask)) { - pr_info("%s: Raced against a concurrent CPU-Offline\n", __func__); - atomic_set(&data.error, -EAGAIN); - goto out_hotplug_enable; - } - /* Call function on all CPUs. One of us will make the * rtas call */ @@ -1000,18 +889,11 @@ int rtas_ibm_suspend_me(u64 handle) if (atomic_read(&data.error) != 0) printk(KERN_ERR "Error doing global join\n"); -out_hotplug_enable: - cpu_hotplug_enable(); - /* Take down CPUs not online prior to suspend */ - cpuret = rtas_offline_cpus_mask(offline_mask); - if (cpuret) - pr_warn("%s: Could not restore CPUs to offline state.\n", - __func__); + cpu_hotplug_enable(); -out: unlock_device_hotplug(); - free_cpumask_var(offline_mask); + return atomic_read(&data.error); } #else /* CONFIG_PPC_PSERIES */ diff --git a/arch/powerpc/platforms/pseries/suspend.c b/arch/powerpc/platforms/pseries/suspend.c index 0a24a5a185f0..f789693f61f4 100644 --- a/arch/powerpc/platforms/pseries/suspend.c +++ b/arch/powerpc/platforms/pseries/suspend.c @@ -132,15 +132,11 @@ static ssize_t store_hibernate(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { - cpumask_var_t offline_mask; int rc; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL)) - return -ENOMEM; - stream_id = simple_strtoul(buf, NULL, 16); do { @@ -150,32 +146,16 @@ static ssize_t store_hibernate(struct device *dev, } while (rc == -EAGAIN); if (!rc) { - /* All present CPUs must be online */ - cpumask_andnot(offline_mask, cpu_present_mask, - cpu_online_mask); - rc = rtas_online_cpus_mask(offline_mask); - if (rc) { - pr_err("%s: Could not bring present CPUs online.\n", - __func__); - goto out; - } - stop_topology_update(); rc = pm_suspend(PM_SUSPEND_MEM); start_topology_update(); - - /* Take down CPUs not online prior to suspend */ - if (!rtas_offline_cpus_mask(offline_mask)) - pr_warn("%s: Could not restore CPUs to offline " - "state.\n", __func__); } stream_id = 0; if (!rc) rc = count; -out: - free_cpumask_var(offline_mask); + return rc; } -- 2.25.4