Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934610AbYCFSyo (ORCPT ); Thu, 6 Mar 2008 13:54:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755889AbYCFSye (ORCPT ); Thu, 6 Mar 2008 13:54:34 -0500 Received: from e32.co.us.ibm.com ([32.97.110.150]:35450 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756107AbYCFSyd (ORCPT ); Thu, 6 Mar 2008 13:54:33 -0500 Subject: [PATCH 3/5] [PPC] hotplug memory notifications for ppc From: Badari Pulavarty To: lkml Cc: linuxppc-dev@ozlabs.org, paulus@samba.org, Yasunori Goto , Andrew Morton In-Reply-To: <1204829673.7939.59.camel@dyn9047017100.beaverton.ibm.com> References: <1204829673.7939.59.camel@dyn9047017100.beaverton.ibm.com> Content-Type: text/plain Date: Thu, 06 Mar 2008 10:57:50 -0800 Message-Id: <1204829870.6272.0.camel@dyn9047017100.beaverton.ibm.com> Mime-Version: 1.0 X-Mailer: Evolution 2.0.4 (2.0.4-4) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4320 Lines: 135 Hotplug memory notifier for ppc64. This gets invoked by writing the device-node that needs to be removed to /proc/ppc64/ofdt. We need to adjust the sections and remove sysfs entries by calling __remove_pages(). Then call arch specific code to get rid of htab mappings for the section of memory. Signed-off-by: Badari Pulavarty Reviewed-by: Michael Ellerman --- arch/powerpc/platforms/pseries/Makefile | 1 arch/powerpc/platforms/pseries/hotplug-memory.c | 98 ++++++++++++++++++++++++ 2 files changed, 99 insertions(+) Index: linux-2.6.25-rc2/arch/powerpc/platforms/pseries/hotplug-memory.c =================================================================== --- /dev/null 1970-01-01 00:00:00.000000000 +0000 +++ linux-2.6.25-rc2/arch/powerpc/platforms/pseries/hotplug-memory.c 2008-02-29 09:25:14.000000000 -0800 @@ -0,0 +1,98 @@ +/* + * pseries Memory Hotplug infrastructure. + * + * Copyright (C) 2008 Badari Pulavarty, IBM Corporation + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#include +#include +#include +#include + +static int pseries_remove_memory(struct device_node *np) +{ + const char *type; + const unsigned int *my_index; + const unsigned int *regs; + u64 start_pfn, start; + struct zone *zone; + int ret = -EINVAL; + + /* + * Check to see if we are actually removing memory + */ + type = of_get_property(np, "device_type", NULL); + if (type == NULL || strcmp(type, "memory") != 0) + return 0; + + /* + * Find the memory index and size of the removing section + */ + my_index = of_get_property(np, "ibm,my-drc-index", NULL); + if (!my_index) + return ret; + + regs = of_get_property(np, "reg", NULL); + if (!regs) + return ret; + + start_pfn = section_nr_to_pfn(*my_index & 0xffff); + zone = page_zone(pfn_to_page(start_pfn)); + + /* + * Remove section mappings and sysfs entries for the + * section of the memory we are removing. + * + * NOTE: Ideally, this should be done in generic code like + * remove_memory(). But remove_memory() gets called by writing + * to sysfs "state" file and we can't remove sysfs entries + * while writing to it. So we have to defer it to here. + */ + ret = __remove_pages(zone, start_pfn, regs[3] >> PAGE_SHIFT); + if (ret) + return ret; + + /* + * Remove htab bolted mappings for this section of memory + */ + start = (unsigned long)__va(start_pfn << PAGE_SHIFT); + ret = remove_section_mapping(start, start + regs[3]); + return ret; +} + +static int pseries_memory_notifier(struct notifier_block *nb, + unsigned long action, void *node) +{ + int err = NOTIFY_OK; + + switch (action) { + case PSERIES_RECONFIG_ADD: + break; + case PSERIES_RECONFIG_REMOVE: + if (pseries_remove_memory(node)) + err = NOTIFY_BAD; + break; + default: + err = NOTIFY_DONE; + break; + } + return err; +} + +static struct notifier_block pseries_mem_nb = { + .notifier_call = pseries_memory_notifier, +}; + +static int __init pseries_memory_hotplug_init(void) +{ + if (firmware_has_feature(FW_FEATURE_LPAR)) + pSeries_reconfig_notifier_register(&pseries_mem_nb); + + return 0; +} +machine_device_initcall(pseries, pseries_memory_hotplug_init); Index: linux-2.6.25-rc2/arch/powerpc/platforms/pseries/Makefile =================================================================== --- linux-2.6.25-rc2.orig/arch/powerpc/platforms/pseries/Makefile 2008-02-28 08:15:53.000000000 -0800 +++ linux-2.6.25-rc2/arch/powerpc/platforms/pseries/Makefile 2008-02-28 08:17:57.000000000 -0800 @@ -14,6 +14,7 @@ obj-$(CONFIG_PCI) += pci.o pci_dlpar.o obj-$(CONFIG_PCI_MSI) += msi.o obj-$(CONFIG_HOTPLUG_CPU) += hotplug-cpu.o +obj-$(CONFIG_MEMORY_HOTPLUG) += hotplug-memory.o obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o obj-$(CONFIG_HVCS) += hvcserver.o -- 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/