![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
378 lines
9.9 KiB
C
378 lines
9.9 KiB
C
/*
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* Standard Hot Plug Controller Driver
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*
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* Copyright (C) 1995,2001 Compaq Computer Corporation
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* Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
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* Copyright (C) 2001 IBM Corp.
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* Copyright (C) 2003-2004 Intel Corporation
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/pci.h>
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#include <linux/workqueue.h>
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#include "shpchp.h"
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/* Global variables */
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int shpchp_debug;
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int shpchp_poll_mode;
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int shpchp_poll_time;
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struct workqueue_struct *shpchp_wq;
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#define DRIVER_VERSION "0.4"
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#define DRIVER_AUTHOR "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
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#define DRIVER_DESC "Standard Hot Plug PCI Controller Driver"
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MODULE_AUTHOR(DRIVER_AUTHOR);
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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module_param(shpchp_debug, bool, 0644);
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module_param(shpchp_poll_mode, bool, 0644);
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module_param(shpchp_poll_time, int, 0644);
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MODULE_PARM_DESC(shpchp_debug, "Debugging mode enabled or not");
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MODULE_PARM_DESC(shpchp_poll_mode, "Using polling mechanism for hot-plug events or not");
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MODULE_PARM_DESC(shpchp_poll_time, "Polling mechanism frequency, in seconds");
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#define SHPC_MODULE_NAME "shpchp"
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static int set_attention_status (struct hotplug_slot *slot, u8 value);
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static int enable_slot (struct hotplug_slot *slot);
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static int disable_slot (struct hotplug_slot *slot);
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static int get_power_status (struct hotplug_slot *slot, u8 *value);
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static int get_attention_status (struct hotplug_slot *slot, u8 *value);
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static int get_latch_status (struct hotplug_slot *slot, u8 *value);
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static int get_adapter_status (struct hotplug_slot *slot, u8 *value);
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static struct hotplug_slot_ops shpchp_hotplug_slot_ops = {
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.set_attention_status = set_attention_status,
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.enable_slot = enable_slot,
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.disable_slot = disable_slot,
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.get_power_status = get_power_status,
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.get_attention_status = get_attention_status,
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.get_latch_status = get_latch_status,
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.get_adapter_status = get_adapter_status,
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};
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/**
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* release_slot - free up the memory used by a slot
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* @hotplug_slot: slot to free
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*/
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static void release_slot(struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = hotplug_slot->private;
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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kfree(slot->hotplug_slot->info);
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kfree(slot->hotplug_slot);
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kfree(slot);
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}
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static int init_slots(struct controller *ctrl)
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{
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struct slot *slot;
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struct hotplug_slot *hotplug_slot;
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struct hotplug_slot_info *info;
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char name[SLOT_NAME_SIZE];
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int retval = -ENOMEM;
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int i;
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for (i = 0; i < ctrl->num_slots; i++) {
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slot = kzalloc(sizeof(*slot), GFP_KERNEL);
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if (!slot)
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goto error;
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hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
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if (!hotplug_slot)
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goto error_slot;
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slot->hotplug_slot = hotplug_slot;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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goto error_hpslot;
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hotplug_slot->info = info;
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slot->hp_slot = i;
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slot->ctrl = ctrl;
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slot->bus = ctrl->pci_dev->subordinate->number;
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slot->device = ctrl->slot_device_offset + i;
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slot->hpc_ops = ctrl->hpc_ops;
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slot->number = ctrl->first_slot + (ctrl->slot_num_inc * i);
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mutex_init(&slot->lock);
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INIT_DELAYED_WORK(&slot->work, shpchp_queue_pushbutton_work);
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/* register this slot with the hotplug pci core */
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hotplug_slot->private = slot;
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hotplug_slot->release = &release_slot;
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snprintf(name, SLOT_NAME_SIZE, "%d", slot->number);
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hotplug_slot->ops = &shpchp_hotplug_slot_ops;
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ctrl_dbg(ctrl, "Registering domain:bus:dev=%04x:%02x:%02x "
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"hp_slot=%x sun=%x slot_device_offset=%x\n",
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pci_domain_nr(ctrl->pci_dev->subordinate),
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slot->bus, slot->device, slot->hp_slot, slot->number,
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ctrl->slot_device_offset);
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retval = pci_hp_register(slot->hotplug_slot,
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ctrl->pci_dev->subordinate, slot->device, name);
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if (retval) {
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ctrl_err(ctrl, "pci_hp_register failed with error %d\n",
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retval);
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goto error_info;
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}
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get_power_status(hotplug_slot, &info->power_status);
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get_attention_status(hotplug_slot, &info->attention_status);
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get_latch_status(hotplug_slot, &info->latch_status);
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get_adapter_status(hotplug_slot, &info->adapter_status);
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list_add(&slot->slot_list, &ctrl->slot_list);
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}
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return 0;
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error_info:
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kfree(info);
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error_hpslot:
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kfree(hotplug_slot);
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error_slot:
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kfree(slot);
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error:
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return retval;
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}
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void cleanup_slots(struct controller *ctrl)
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{
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struct list_head *tmp;
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struct list_head *next;
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struct slot *slot;
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list_for_each_safe(tmp, next, &ctrl->slot_list) {
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slot = list_entry(tmp, struct slot, slot_list);
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list_del(&slot->slot_list);
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cancel_delayed_work(&slot->work);
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flush_scheduled_work();
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flush_workqueue(shpchp_wq);
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pci_hp_deregister(slot->hotplug_slot);
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}
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}
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/*
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* set_attention_status - Turns the Amber LED for a slot on, off or blink
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*/
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static int set_attention_status (struct hotplug_slot *hotplug_slot, u8 status)
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{
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struct slot *slot = get_slot(hotplug_slot);
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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hotplug_slot->info->attention_status = status;
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slot->hpc_ops->set_attention_status(slot, status);
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return 0;
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}
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static int enable_slot (struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = get_slot(hotplug_slot);
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return shpchp_sysfs_enable_slot(slot);
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}
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static int disable_slot (struct hotplug_slot *hotplug_slot)
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{
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struct slot *slot = get_slot(hotplug_slot);
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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return shpchp_sysfs_disable_slot(slot);
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}
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static int get_power_status (struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = get_slot(hotplug_slot);
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int retval;
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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retval = slot->hpc_ops->get_power_status(slot, value);
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if (retval < 0)
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*value = hotplug_slot->info->power_status;
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return 0;
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}
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static int get_attention_status (struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = get_slot(hotplug_slot);
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int retval;
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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retval = slot->hpc_ops->get_attention_status(slot, value);
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if (retval < 0)
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*value = hotplug_slot->info->attention_status;
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return 0;
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}
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static int get_latch_status (struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = get_slot(hotplug_slot);
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int retval;
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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retval = slot->hpc_ops->get_latch_status(slot, value);
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if (retval < 0)
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*value = hotplug_slot->info->latch_status;
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return 0;
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}
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static int get_adapter_status (struct hotplug_slot *hotplug_slot, u8 *value)
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{
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struct slot *slot = get_slot(hotplug_slot);
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int retval;
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ctrl_dbg(slot->ctrl, "%s: physical_slot = %s\n",
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__func__, slot_name(slot));
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retval = slot->hpc_ops->get_adapter_status(slot, value);
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if (retval < 0)
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*value = hotplug_slot->info->adapter_status;
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return 0;
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}
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static int is_shpc_capable(struct pci_dev *dev)
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{
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if ((dev->vendor == PCI_VENDOR_ID_AMD) || (dev->device ==
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PCI_DEVICE_ID_AMD_GOLAM_7450))
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return 1;
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if (!pci_find_capability(dev, PCI_CAP_ID_SHPC))
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return 0;
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if (get_hp_hw_control_from_firmware(dev))
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return 0;
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return 1;
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}
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static int shpc_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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int rc;
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struct controller *ctrl;
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if (!is_shpc_capable(pdev))
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return -ENODEV;
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ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
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if (!ctrl) {
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dev_err(&pdev->dev, "%s: Out of memory\n", __func__);
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goto err_out_none;
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}
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INIT_LIST_HEAD(&ctrl->slot_list);
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rc = shpc_init(ctrl, pdev);
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if (rc) {
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ctrl_dbg(ctrl, "Controller initialization failed\n");
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goto err_out_free_ctrl;
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}
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pci_set_drvdata(pdev, ctrl);
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/* Setup the slot information structures */
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rc = init_slots(ctrl);
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if (rc) {
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ctrl_err(ctrl, "Slot initialization failed\n");
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goto err_out_release_ctlr;
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}
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rc = shpchp_create_ctrl_files(ctrl);
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if (rc)
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goto err_cleanup_slots;
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return 0;
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err_cleanup_slots:
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cleanup_slots(ctrl);
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err_out_release_ctlr:
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ctrl->hpc_ops->release_ctlr(ctrl);
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err_out_free_ctrl:
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kfree(ctrl);
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err_out_none:
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return -ENODEV;
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}
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static void shpc_remove(struct pci_dev *dev)
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{
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struct controller *ctrl = pci_get_drvdata(dev);
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shpchp_remove_ctrl_files(ctrl);
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ctrl->hpc_ops->release_ctlr(ctrl);
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kfree(ctrl);
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}
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static struct pci_device_id shpcd_pci_tbl[] = {
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{PCI_DEVICE_CLASS(((PCI_CLASS_BRIDGE_PCI << 8) | 0x00), ~0)},
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{ /* end: all zeroes */ }
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};
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MODULE_DEVICE_TABLE(pci, shpcd_pci_tbl);
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static struct pci_driver shpc_driver = {
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.name = SHPC_MODULE_NAME,
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.id_table = shpcd_pci_tbl,
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.probe = shpc_probe,
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.remove = shpc_remove,
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};
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static int __init shpcd_init(void)
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{
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int retval = 0;
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retval = pci_register_driver(&shpc_driver);
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dbg("%s: pci_register_driver = %d\n", __func__, retval);
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info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
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return retval;
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}
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static void __exit shpcd_cleanup(void)
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{
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dbg("unload_shpchpd()\n");
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pci_unregister_driver(&shpc_driver);
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info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
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}
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module_init(shpcd_init);
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module_exit(shpcd_cleanup);
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