Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755491AbZJ3FXf (ORCPT ); Fri, 30 Oct 2009 01:23:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755293AbZJ3FXA (ORCPT ); Fri, 30 Oct 2009 01:23:00 -0400 Received: from e28smtp04.in.ibm.com ([59.145.155.4]:49261 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755247AbZJ3FW5 (ORCPT ); Fri, 30 Oct 2009 01:22:57 -0400 Subject: [PATCH v5 3/4] pseries: Add code to online/offline CPUs of a DLPAR node. To: Nathan Fontenot , Benjamin Herrenschmidt From: Gautham R Shenoy Cc: Peter Zijlstra , Balbir Singh , linux-kernel@vger.kernel.org, Dipankar Sarma , Arun R Bharadwaj , Andrew Morton , Vaidyanathan Srinivasan , linuxppc-dev@lists.ozlabs.org, Ingo Molnar Date: Fri, 30 Oct 2009 10:52:59 +0530 Message-ID: <20091030052258.25493.89919.stgit@sofia.in.ibm.com> In-Reply-To: <20091030052106.25493.42109.stgit@sofia.in.ibm.com> References: <20091030052106.25493.42109.stgit@sofia.in.ibm.com> User-Agent: StGit/0.14.3.384.g9ab0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4292 Lines: 165 Currently the cpu-allocation/deallocation on pSeries is a two step process from the Userspace. - Set the indicators and update the device tree by writing to the sysfs tunable "probe" during allocation and "release" during deallocation. - Online / Offline the CPUs of the allocated/would_be_deallocated node by writing to the sysfs tunable "online". This patch adds kernel code to online/offline the CPUs soon_after/just_before they have been allocated/would_be_deallocated. This way, the userspace tool that performs DLPAR operations would only have to deal with one set of sysfs tunables namely "probe" and release". Signed-off-by: Gautham R Shenoy Signed-off-by: Nathan Fontenot --- arch/powerpc/platforms/pseries/dlpar.c | 101 ++++++++++++++++++++++++++++++++ 1 files changed, 101 insertions(+), 0 deletions(-) diff --git a/arch/powerpc/platforms/pseries/dlpar.c b/arch/powerpc/platforms/pseries/dlpar.c index ceb6d17..8e04a69 100644 --- a/arch/powerpc/platforms/pseries/dlpar.c +++ b/arch/powerpc/platforms/pseries/dlpar.c @@ -19,6 +19,7 @@ #include #include #include +#include "offline_states.h" #include #include @@ -353,6 +354,98 @@ int remove_device_tree_nodes(struct device_node *dn) return rc; } +int online_node_cpus(struct device_node *dn) +{ + int rc = 0; + unsigned int cpu; + int len, nthreads, i; + const u32 *intserv; + + intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); + if (!intserv) + return -EINVAL; + + nthreads = len / sizeof(u32); + + cpu_maps_update_begin(); + for (i = 0; i < nthreads; i++) { + for_each_present_cpu(cpu) { + if (get_hard_smp_processor_id(cpu) != intserv[i]) + continue; + BUG_ON(get_cpu_current_state(cpu) + != CPU_STATE_OFFLINE); + cpu_maps_update_done(); + rc = cpu_up(cpu); + if (rc) + goto out; + cpu_maps_update_begin(); + + break; + } + if (cpu == num_possible_cpus()) + printk(KERN_WARNING "Could not find cpu to online " + "with physical id 0x%x\n", intserv[i]); + } + cpu_maps_update_done(); + +out: + return rc; + +} + +int offline_node_cpus(struct device_node *dn) +{ + int rc = 0; + unsigned int cpu; + int len, nthreads, i; + const u32 *intserv; + + intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", &len); + if (!intserv) + return -EINVAL; + + nthreads = len / sizeof(u32); + + cpu_maps_update_begin(); + for (i = 0; i < nthreads; i++) { + for_each_present_cpu(cpu) { + if (get_hard_smp_processor_id(cpu) != intserv[i]) + continue; + + if (get_cpu_current_state(cpu) == CPU_STATE_OFFLINE) + break; + + if (get_cpu_current_state(cpu) == CPU_STATE_ONLINE) { + cpu_maps_update_done(); + rc = cpu_down(cpu); + if (rc) + goto out; + cpu_maps_update_begin(); + break; + + } + + /* + * The cpu is in CPU_STATE_INACTIVE. + * Upgrade it's state to CPU_STATE_OFFLINE. + */ + set_preferred_offline_state(cpu, CPU_STATE_OFFLINE); + BUG_ON(plpar_hcall_norets(H_PROD, intserv[i]) + != H_SUCCESS); + __cpu_die(cpu); + break; + } + if (cpu == num_possible_cpus()) + printk(KERN_WARNING "Could not find cpu to offline " + "with physical id 0x%x\n", intserv[i]); + } + cpu_maps_update_done(); + +out: + return rc; + +} + #define DR_ENTITY_SENSE 9003 #define DR_ENTITY_PRESENT 1 #define DR_ENTITY_UNUSABLE 2 @@ -447,6 +540,8 @@ static ssize_t cpu_probe_store(struct class *class, const char *buf, if (rc) release_drc(drc_index); + rc = online_node_cpus(dn); + return rc ? -EINVAL : count; } @@ -467,6 +562,11 @@ static ssize_t cpu_release_store(struct class *class, const char *buf, return -EINVAL; } + rc = offline_node_cpus(dn); + + if (rc) + goto out; + rc = release_drc(*drc_index); if (rc) { of_node_put(dn); @@ -478,6 +578,7 @@ static ssize_t cpu_release_store(struct class *class, const char *buf, acquire_drc(*drc_index); of_node_put(dn); +out: return rc ? -EINVAL : count; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/