![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>
627 lines
14 KiB
C
627 lines
14 KiB
C
/*
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* PCI Express 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/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 "../pci.h"
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#include "pciehp.h"
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static void interrupt_event_handler(struct work_struct *work);
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static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
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{
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struct event_info *info;
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info = kmalloc(sizeof(*info), GFP_ATOMIC);
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if (!info)
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return -ENOMEM;
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info->event_type = event_type;
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info->p_slot = p_slot;
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INIT_WORK(&info->work, interrupt_event_handler);
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schedule_work(&info->work);
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return 0;
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}
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u8 pciehp_handle_attention_button(struct slot *p_slot)
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{
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u32 event_type;
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struct controller *ctrl = p_slot->ctrl;
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/* Attention Button Change */
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ctrl_dbg(ctrl, "Attention button interrupt received\n");
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/*
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* Button pressed - See if need to TAKE ACTION!!!
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*/
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ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
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event_type = INT_BUTTON_PRESS;
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queue_interrupt_event(p_slot, event_type);
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return 0;
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}
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u8 pciehp_handle_switch_change(struct slot *p_slot)
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{
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u8 getstatus;
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u32 event_type;
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struct controller *ctrl = p_slot->ctrl;
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/* Switch Change */
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ctrl_dbg(ctrl, "Switch interrupt received\n");
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pciehp_get_latch_status(p_slot, &getstatus);
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if (getstatus) {
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/*
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* Switch opened
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*/
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ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
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event_type = INT_SWITCH_OPEN;
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} else {
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/*
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* Switch closed
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*/
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ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
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event_type = INT_SWITCH_CLOSE;
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}
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queue_interrupt_event(p_slot, event_type);
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return 1;
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}
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u8 pciehp_handle_presence_change(struct slot *p_slot)
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{
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u32 event_type;
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u8 presence_save;
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struct controller *ctrl = p_slot->ctrl;
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/* Presence Change */
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ctrl_dbg(ctrl, "Presence/Notify input change\n");
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/* Switch is open, assume a presence change
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* Save the presence state
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*/
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pciehp_get_adapter_status(p_slot, &presence_save);
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if (presence_save) {
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/*
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* Card Present
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*/
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ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
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event_type = INT_PRESENCE_ON;
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} else {
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/*
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* Not Present
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*/
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ctrl_info(ctrl, "Card not present on Slot(%s)\n",
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slot_name(p_slot));
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event_type = INT_PRESENCE_OFF;
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}
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queue_interrupt_event(p_slot, event_type);
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return 1;
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}
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u8 pciehp_handle_power_fault(struct slot *p_slot)
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{
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u32 event_type;
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struct controller *ctrl = p_slot->ctrl;
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/* power fault */
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ctrl_dbg(ctrl, "Power fault interrupt received\n");
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ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
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event_type = INT_POWER_FAULT;
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ctrl_info(ctrl, "Power fault bit %x set\n", 0);
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queue_interrupt_event(p_slot, event_type);
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return 1;
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}
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/* The following routines constitute the bulk of the
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hotplug controller logic
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*/
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static void set_slot_off(struct controller *ctrl, struct slot * pslot)
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{
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/* turn off slot, turn on Amber LED, turn off Green LED if supported*/
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if (POWER_CTRL(ctrl)) {
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if (pciehp_power_off_slot(pslot)) {
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ctrl_err(ctrl,
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"Issue of Slot Power Off command failed\n");
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return;
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}
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/*
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* After turning power off, we must wait for at least 1 second
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* before taking any action that relies on power having been
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* removed from the slot/adapter.
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*/
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msleep(1000);
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}
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if (PWR_LED(ctrl))
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pciehp_green_led_off(pslot);
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if (ATTN_LED(ctrl)) {
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if (pciehp_set_attention_status(pslot, 1)) {
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ctrl_err(ctrl,
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"Issue of Set Attention Led command failed\n");
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return;
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}
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}
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}
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/**
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* board_added - Called after a board has been added to the system.
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* @p_slot: &slot where board is added
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*
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* Turns power on for the board.
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* Configures board.
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*/
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static int board_added(struct slot *p_slot)
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{
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int retval = 0;
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struct controller *ctrl = p_slot->ctrl;
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struct pci_bus *parent = ctrl->pcie->port->subordinate;
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if (POWER_CTRL(ctrl)) {
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/* Power on slot */
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retval = pciehp_power_on_slot(p_slot);
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if (retval)
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return retval;
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}
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if (PWR_LED(ctrl))
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pciehp_green_led_blink(p_slot);
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/* Check link training status */
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retval = pciehp_check_link_status(ctrl);
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if (retval) {
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ctrl_err(ctrl, "Failed to check link status\n");
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goto err_exit;
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}
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/* Check for a power fault */
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if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
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ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
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retval = -EIO;
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goto err_exit;
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}
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retval = pciehp_configure_device(p_slot);
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if (retval) {
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ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
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pci_domain_nr(parent), parent->number);
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goto err_exit;
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}
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if (PWR_LED(ctrl))
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pciehp_green_led_on(p_slot);
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return 0;
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err_exit:
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set_slot_off(ctrl, p_slot);
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return retval;
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}
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/**
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* remove_board - Turns off slot and LEDs
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* @p_slot: slot where board is being removed
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*/
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static int remove_board(struct slot *p_slot)
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{
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int retval = 0;
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struct controller *ctrl = p_slot->ctrl;
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retval = pciehp_unconfigure_device(p_slot);
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if (retval)
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return retval;
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if (POWER_CTRL(ctrl)) {
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/* power off slot */
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retval = pciehp_power_off_slot(p_slot);
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if (retval) {
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ctrl_err(ctrl,
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"Issue of Slot Disable command failed\n");
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return retval;
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}
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/*
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* After turning power off, we must wait for at least 1 second
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* before taking any action that relies on power having been
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* removed from the slot/adapter.
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*/
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msleep(1000);
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}
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/* turn off Green LED */
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if (PWR_LED(ctrl))
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pciehp_green_led_off(p_slot);
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return 0;
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}
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struct power_work_info {
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struct slot *p_slot;
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struct work_struct work;
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};
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/**
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* pciehp_power_thread - handle pushbutton events
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* @work: &struct work_struct describing work to be done
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*
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* Scheduled procedure to handle blocking stuff for the pushbuttons.
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* Handles all pending events and exits.
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*/
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static void pciehp_power_thread(struct work_struct *work)
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{
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struct power_work_info *info =
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container_of(work, struct power_work_info, work);
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struct slot *p_slot = info->p_slot;
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mutex_lock(&p_slot->lock);
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switch (p_slot->state) {
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case POWEROFF_STATE:
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mutex_unlock(&p_slot->lock);
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ctrl_dbg(p_slot->ctrl,
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"Disabling domain:bus:device=%04x:%02x:00\n",
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pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
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p_slot->ctrl->pcie->port->subordinate->number);
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pciehp_disable_slot(p_slot);
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mutex_lock(&p_slot->lock);
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p_slot->state = STATIC_STATE;
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break;
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case POWERON_STATE:
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mutex_unlock(&p_slot->lock);
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if (pciehp_enable_slot(p_slot) && PWR_LED(p_slot->ctrl))
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pciehp_green_led_off(p_slot);
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mutex_lock(&p_slot->lock);
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p_slot->state = STATIC_STATE;
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break;
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default:
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break;
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}
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mutex_unlock(&p_slot->lock);
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kfree(info);
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}
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void pciehp_queue_pushbutton_work(struct work_struct *work)
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{
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struct slot *p_slot = container_of(work, struct slot, work.work);
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struct power_work_info *info;
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
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__func__);
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return;
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}
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info->p_slot = p_slot;
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INIT_WORK(&info->work, pciehp_power_thread);
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mutex_lock(&p_slot->lock);
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switch (p_slot->state) {
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case BLINKINGOFF_STATE:
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p_slot->state = POWEROFF_STATE;
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break;
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case BLINKINGON_STATE:
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p_slot->state = POWERON_STATE;
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break;
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default:
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kfree(info);
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goto out;
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}
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queue_work(pciehp_wq, &info->work);
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out:
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mutex_unlock(&p_slot->lock);
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}
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/*
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* Note: This function must be called with slot->lock held
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*/
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static void handle_button_press_event(struct slot *p_slot)
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{
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struct controller *ctrl = p_slot->ctrl;
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u8 getstatus;
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switch (p_slot->state) {
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case STATIC_STATE:
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pciehp_get_power_status(p_slot, &getstatus);
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if (getstatus) {
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p_slot->state = BLINKINGOFF_STATE;
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ctrl_info(ctrl,
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"PCI slot #%s - powering off due to button "
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"press.\n", slot_name(p_slot));
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} else {
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p_slot->state = BLINKINGON_STATE;
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ctrl_info(ctrl,
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"PCI slot #%s - powering on due to button "
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"press.\n", slot_name(p_slot));
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}
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/* blink green LED and turn off amber */
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if (PWR_LED(ctrl))
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pciehp_green_led_blink(p_slot);
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if (ATTN_LED(ctrl))
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pciehp_set_attention_status(p_slot, 0);
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schedule_delayed_work(&p_slot->work, 5*HZ);
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break;
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case BLINKINGOFF_STATE:
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case BLINKINGON_STATE:
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/*
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* Cancel if we are still blinking; this means that we
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* press the attention again before the 5 sec. limit
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* expires to cancel hot-add or hot-remove
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*/
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ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
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cancel_delayed_work(&p_slot->work);
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if (p_slot->state == BLINKINGOFF_STATE) {
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if (PWR_LED(ctrl))
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pciehp_green_led_on(p_slot);
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} else {
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if (PWR_LED(ctrl))
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pciehp_green_led_off(p_slot);
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}
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if (ATTN_LED(ctrl))
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pciehp_set_attention_status(p_slot, 0);
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ctrl_info(ctrl, "PCI slot #%s - action canceled "
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"due to button press\n", slot_name(p_slot));
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p_slot->state = STATIC_STATE;
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break;
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case POWEROFF_STATE:
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case POWERON_STATE:
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/*
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* Ignore if the slot is on power-on or power-off state;
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* this means that the previous attention button action
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* to hot-add or hot-remove is undergoing
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*/
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ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
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break;
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default:
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ctrl_warn(ctrl, "Not a valid state\n");
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break;
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}
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}
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/*
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* Note: This function must be called with slot->lock held
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*/
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static void handle_surprise_event(struct slot *p_slot)
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{
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u8 getstatus;
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struct power_work_info *info;
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info = kmalloc(sizeof(*info), GFP_KERNEL);
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if (!info) {
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ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
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__func__);
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return;
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}
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info->p_slot = p_slot;
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INIT_WORK(&info->work, pciehp_power_thread);
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pciehp_get_adapter_status(p_slot, &getstatus);
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if (!getstatus)
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p_slot->state = POWEROFF_STATE;
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else
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p_slot->state = POWERON_STATE;
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queue_work(pciehp_wq, &info->work);
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}
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static void interrupt_event_handler(struct work_struct *work)
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{
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struct event_info *info = container_of(work, struct event_info, work);
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struct slot *p_slot = info->p_slot;
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struct controller *ctrl = p_slot->ctrl;
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mutex_lock(&p_slot->lock);
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switch (info->event_type) {
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case INT_BUTTON_PRESS:
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handle_button_press_event(p_slot);
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break;
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case INT_POWER_FAULT:
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if (!POWER_CTRL(ctrl))
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break;
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if (ATTN_LED(ctrl))
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pciehp_set_attention_status(p_slot, 1);
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if (PWR_LED(ctrl))
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pciehp_green_led_off(p_slot);
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break;
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case INT_PRESENCE_ON:
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case INT_PRESENCE_OFF:
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if (!HP_SUPR_RM(ctrl))
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break;
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ctrl_dbg(ctrl, "Surprise Removal\n");
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handle_surprise_event(p_slot);
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break;
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default:
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break;
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}
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mutex_unlock(&p_slot->lock);
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kfree(info);
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}
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int pciehp_enable_slot(struct slot *p_slot)
|
|
{
|
|
u8 getstatus = 0;
|
|
int rc;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
rc = pciehp_get_adapter_status(p_slot, &getstatus);
|
|
if (rc || !getstatus) {
|
|
ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
|
|
return -ENODEV;
|
|
}
|
|
if (MRL_SENS(p_slot->ctrl)) {
|
|
rc = pciehp_get_latch_status(p_slot, &getstatus);
|
|
if (rc || getstatus) {
|
|
ctrl_info(ctrl, "Latch open on slot(%s)\n",
|
|
slot_name(p_slot));
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (POWER_CTRL(p_slot->ctrl)) {
|
|
rc = pciehp_get_power_status(p_slot, &getstatus);
|
|
if (rc || getstatus) {
|
|
ctrl_info(ctrl, "Already enabled on slot(%s)\n",
|
|
slot_name(p_slot));
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
pciehp_get_latch_status(p_slot, &getstatus);
|
|
|
|
rc = board_added(p_slot);
|
|
if (rc) {
|
|
pciehp_get_latch_status(p_slot, &getstatus);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
|
|
int pciehp_disable_slot(struct slot *p_slot)
|
|
{
|
|
u8 getstatus = 0;
|
|
int ret = 0;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
if (!p_slot->ctrl)
|
|
return 1;
|
|
|
|
if (!HP_SUPR_RM(p_slot->ctrl)) {
|
|
ret = pciehp_get_adapter_status(p_slot, &getstatus);
|
|
if (ret || !getstatus) {
|
|
ctrl_info(ctrl, "No adapter on slot(%s)\n",
|
|
slot_name(p_slot));
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (MRL_SENS(p_slot->ctrl)) {
|
|
ret = pciehp_get_latch_status(p_slot, &getstatus);
|
|
if (ret || getstatus) {
|
|
ctrl_info(ctrl, "Latch open on slot(%s)\n",
|
|
slot_name(p_slot));
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (POWER_CTRL(p_slot->ctrl)) {
|
|
ret = pciehp_get_power_status(p_slot, &getstatus);
|
|
if (ret || !getstatus) {
|
|
ctrl_info(ctrl, "Already disabled on slot(%s)\n",
|
|
slot_name(p_slot));
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
return remove_board(p_slot);
|
|
}
|
|
|
|
int pciehp_sysfs_enable_slot(struct slot *p_slot)
|
|
{
|
|
int retval = -ENODEV;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
mutex_lock(&p_slot->lock);
|
|
switch (p_slot->state) {
|
|
case BLINKINGON_STATE:
|
|
cancel_delayed_work(&p_slot->work);
|
|
case STATIC_STATE:
|
|
p_slot->state = POWERON_STATE;
|
|
mutex_unlock(&p_slot->lock);
|
|
retval = pciehp_enable_slot(p_slot);
|
|
mutex_lock(&p_slot->lock);
|
|
p_slot->state = STATIC_STATE;
|
|
break;
|
|
case POWERON_STATE:
|
|
ctrl_info(ctrl, "Slot %s is already in powering on state\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
case BLINKINGOFF_STATE:
|
|
case POWEROFF_STATE:
|
|
ctrl_info(ctrl, "Already enabled on slot %s\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Not a valid state on slot %s\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
}
|
|
mutex_unlock(&p_slot->lock);
|
|
|
|
return retval;
|
|
}
|
|
|
|
int pciehp_sysfs_disable_slot(struct slot *p_slot)
|
|
{
|
|
int retval = -ENODEV;
|
|
struct controller *ctrl = p_slot->ctrl;
|
|
|
|
mutex_lock(&p_slot->lock);
|
|
switch (p_slot->state) {
|
|
case BLINKINGOFF_STATE:
|
|
cancel_delayed_work(&p_slot->work);
|
|
case STATIC_STATE:
|
|
p_slot->state = POWEROFF_STATE;
|
|
mutex_unlock(&p_slot->lock);
|
|
retval = pciehp_disable_slot(p_slot);
|
|
mutex_lock(&p_slot->lock);
|
|
p_slot->state = STATIC_STATE;
|
|
break;
|
|
case POWEROFF_STATE:
|
|
ctrl_info(ctrl, "Slot %s is already in powering off state\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
case BLINKINGON_STATE:
|
|
case POWERON_STATE:
|
|
ctrl_info(ctrl, "Already disabled on slot %s\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
default:
|
|
ctrl_err(ctrl, "Not a valid state on slot %s\n",
|
|
slot_name(p_slot));
|
|
break;
|
|
}
|
|
mutex_unlock(&p_slot->lock);
|
|
|
|
return retval;
|
|
}
|