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![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>
304 lines
7.3 KiB
C
304 lines
7.3 KiB
C
/*
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* SN Platform system controller communication support
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 2004-2006 Silicon Graphics, Inc. All rights reserved.
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*/
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/*
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* System controller event handler
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*
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* These routines deal with environmental events arriving from the
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* system controllers.
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*/
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#include <linux/interrupt.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <asm/byteorder.h>
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#include <asm/sn/sn_sal.h>
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#include <asm/unaligned.h>
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#include "snsc.h"
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static struct subch_data_s *event_sd;
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void scdrv_event(unsigned long);
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DECLARE_TASKLET(sn_sysctl_event, scdrv_event, 0);
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/*
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* scdrv_event_interrupt
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*
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* Pull incoming environmental events off the physical link to the
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* system controller and put them in a temporary holding area in SAL.
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* Schedule scdrv_event() to move them along to their ultimate
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* destination.
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*/
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static irqreturn_t
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scdrv_event_interrupt(int irq, void *subch_data)
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{
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struct subch_data_s *sd = subch_data;
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unsigned long flags;
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int status;
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spin_lock_irqsave(&sd->sd_rlock, flags);
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status = ia64_sn_irtr_intr(sd->sd_nasid, sd->sd_subch);
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if ((status > 0) && (status & SAL_IROUTER_INTR_RECV)) {
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tasklet_schedule(&sn_sysctl_event);
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}
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spin_unlock_irqrestore(&sd->sd_rlock, flags);
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return IRQ_HANDLED;
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}
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/*
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* scdrv_parse_event
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*
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* Break an event (as read from SAL) into useful pieces so we can decide
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* what to do with it.
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*/
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static int
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scdrv_parse_event(char *event, int *src, int *code, int *esp_code, char *desc)
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{
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char *desc_end;
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/* record event source address */
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*src = get_unaligned_be32(event);
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event += 4; /* move on to event code */
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/* record the system controller's event code */
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*code = get_unaligned_be32(event);
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event += 4; /* move on to event arguments */
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/* how many arguments are in the packet? */
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if (*event++ != 2) {
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/* if not 2, give up */
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return -1;
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}
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/* parse out the ESP code */
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if (*event++ != IR_ARG_INT) {
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/* not an integer argument, so give up */
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return -1;
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}
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*esp_code = get_unaligned_be32(event);
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event += 4;
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/* parse out the event description */
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if (*event++ != IR_ARG_ASCII) {
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/* not an ASCII string, so give up */
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return -1;
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}
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event[CHUNKSIZE-1] = '\0'; /* ensure this string ends! */
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event += 2; /* skip leading CR/LF */
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desc_end = desc + sprintf(desc, "%s", event);
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/* strip trailing CR/LF (if any) */
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for (desc_end--;
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(desc_end != desc) && ((*desc_end == 0xd) || (*desc_end == 0xa));
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desc_end--) {
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*desc_end = '\0';
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}
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return 0;
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}
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/*
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* scdrv_event_severity
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*
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* Figure out how urgent a message we should write to the console/syslog
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* via printk.
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*/
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static char *
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scdrv_event_severity(int code)
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{
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int ev_class = (code & EV_CLASS_MASK);
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int ev_severity = (code & EV_SEVERITY_MASK);
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char *pk_severity = KERN_NOTICE;
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switch (ev_class) {
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case EV_CLASS_POWER:
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switch (ev_severity) {
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case EV_SEVERITY_POWER_LOW_WARNING:
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case EV_SEVERITY_POWER_HIGH_WARNING:
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pk_severity = KERN_WARNING;
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break;
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case EV_SEVERITY_POWER_HIGH_FAULT:
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case EV_SEVERITY_POWER_LOW_FAULT:
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pk_severity = KERN_ALERT;
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break;
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}
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break;
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case EV_CLASS_FAN:
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switch (ev_severity) {
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case EV_SEVERITY_FAN_WARNING:
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pk_severity = KERN_WARNING;
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break;
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case EV_SEVERITY_FAN_FAULT:
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pk_severity = KERN_CRIT;
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break;
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}
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break;
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case EV_CLASS_TEMP:
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switch (ev_severity) {
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case EV_SEVERITY_TEMP_ADVISORY:
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pk_severity = KERN_WARNING;
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break;
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case EV_SEVERITY_TEMP_CRITICAL:
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pk_severity = KERN_CRIT;
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break;
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case EV_SEVERITY_TEMP_FAULT:
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pk_severity = KERN_ALERT;
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break;
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}
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break;
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case EV_CLASS_ENV:
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pk_severity = KERN_ALERT;
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break;
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case EV_CLASS_TEST_FAULT:
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pk_severity = KERN_ALERT;
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break;
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case EV_CLASS_TEST_WARNING:
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pk_severity = KERN_WARNING;
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break;
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case EV_CLASS_PWRD_NOTIFY:
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pk_severity = KERN_ALERT;
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break;
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}
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return pk_severity;
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}
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/*
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* scdrv_dispatch_event
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*
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* Do the right thing with an incoming event. That's often nothing
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* more than printing it to the system log. For power-down notifications
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* we start a graceful shutdown.
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*/
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static void
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scdrv_dispatch_event(char *event, int len)
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{
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static int snsc_shutting_down = 0;
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int code, esp_code, src, class;
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char desc[CHUNKSIZE];
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char *severity;
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if (scdrv_parse_event(event, &src, &code, &esp_code, desc) < 0) {
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/* ignore uninterpretible event */
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return;
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}
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/* how urgent is the message? */
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severity = scdrv_event_severity(code);
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class = (code & EV_CLASS_MASK);
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if (class == EV_CLASS_PWRD_NOTIFY || code == ENV_PWRDN_PEND) {
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if (snsc_shutting_down)
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return;
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snsc_shutting_down = 1;
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/* give a message for each type of event */
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if (class == EV_CLASS_PWRD_NOTIFY)
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printk(KERN_NOTICE "Power off indication received."
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" Sending SIGPWR to init...\n");
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else if (code == ENV_PWRDN_PEND)
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printk(KERN_CRIT "WARNING: Shutting down the system"
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" due to a critical environmental condition."
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" Sending SIGPWR to init...\n");
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/* give a SIGPWR signal to init proc */
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kill_cad_pid(SIGPWR, 0);
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} else {
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/* print to system log */
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printk("%s|$(0x%x)%s\n", severity, esp_code, desc);
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}
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}
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/*
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* scdrv_event
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*
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* Called as a tasklet when an event arrives from the L1. Read the event
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* from where it's temporarily stored in SAL and call scdrv_dispatch_event()
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* to send it on its way. Keep trying to read events until SAL indicates
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* that there are no more immediately available.
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*/
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void
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scdrv_event(unsigned long dummy)
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{
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int status;
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int len;
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unsigned long flags;
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struct subch_data_s *sd = event_sd;
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/* anything to read? */
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len = CHUNKSIZE;
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spin_lock_irqsave(&sd->sd_rlock, flags);
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status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
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sd->sd_rb, &len);
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while (!(status < 0)) {
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spin_unlock_irqrestore(&sd->sd_rlock, flags);
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scdrv_dispatch_event(sd->sd_rb, len);
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len = CHUNKSIZE;
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spin_lock_irqsave(&sd->sd_rlock, flags);
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status = ia64_sn_irtr_recv(sd->sd_nasid, sd->sd_subch,
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sd->sd_rb, &len);
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}
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spin_unlock_irqrestore(&sd->sd_rlock, flags);
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}
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/*
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* scdrv_event_init
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*
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* Sets up a system controller subchannel to begin receiving event
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* messages. This is sort of a specialized version of scdrv_open()
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* in drivers/char/sn_sysctl.c.
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*/
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void
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scdrv_event_init(struct sysctl_data_s *scd)
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{
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int rv;
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event_sd = kzalloc(sizeof (struct subch_data_s), GFP_KERNEL);
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if (event_sd == NULL) {
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printk(KERN_WARNING "%s: couldn't allocate subchannel info"
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" for event monitoring\n", __func__);
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return;
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}
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/* initialize subch_data_s fields */
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event_sd->sd_nasid = scd->scd_nasid;
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spin_lock_init(&event_sd->sd_rlock);
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/* ask the system controllers to send events to this node */
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event_sd->sd_subch = ia64_sn_sysctl_event_init(scd->scd_nasid);
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if (event_sd->sd_subch < 0) {
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kfree(event_sd);
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printk(KERN_WARNING "%s: couldn't open event subchannel\n",
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__func__);
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return;
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}
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/* hook event subchannel up to the system controller interrupt */
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rv = request_irq(SGI_UART_VECTOR, scdrv_event_interrupt,
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IRQF_SHARED | IRQF_DISABLED,
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"system controller events", event_sd);
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if (rv) {
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printk(KERN_WARNING "%s: irq request failed (%d)\n",
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__func__, rv);
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ia64_sn_irtr_close(event_sd->sd_nasid, event_sd->sd_subch);
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kfree(event_sd);
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return;
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}
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}
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