kernel-aes67/arch/powerpc/oprofile/cell/spu_task_sync.c
Alexey Dobriyan 4e950f6f01 Remove fs.h from mm.h
Remove fs.h from mm.h. For this,
 1) Uninline vma_wants_writenotify(). It's pretty huge anyway.
 2) Add back fs.h or less bloated headers (err.h) to files that need it.

As result, on x86_64 allyesconfig, fs.h dependencies cut down from 3929 files
rebuilt down to 3444 (-12.3%).

Cross-compile tested without regressions on my two usual configs and (sigh):

alpha              arm-mx1ads        mips-bigsur          powerpc-ebony
alpha-allnoconfig  arm-neponset      mips-capcella        powerpc-g5
alpha-defconfig    arm-netwinder     mips-cobalt          powerpc-holly
alpha-up           arm-netx          mips-db1000          powerpc-iseries
arm                arm-ns9xxx        mips-db1100          powerpc-linkstation
arm-assabet        arm-omap_h2_1610  mips-db1200          powerpc-lite5200
arm-at91rm9200dk   arm-onearm        mips-db1500          powerpc-maple
arm-at91rm9200ek   arm-picotux200    mips-db1550          powerpc-mpc7448_hpc2
arm-at91sam9260ek  arm-pleb          mips-ddb5477         powerpc-mpc8272_ads
arm-at91sam9261ek  arm-pnx4008       mips-decstation      powerpc-mpc8313_rdb
arm-at91sam9263ek  arm-pxa255-idp    mips-e55             powerpc-mpc832x_mds
arm-at91sam9rlek   arm-realview      mips-emma2rh         powerpc-mpc832x_rdb
arm-ateb9200       arm-realview-smp  mips-excite          powerpc-mpc834x_itx
arm-badge4         arm-rpc           mips-fulong          powerpc-mpc834x_itxgp
arm-carmeva        arm-s3c2410       mips-ip22            powerpc-mpc834x_mds
arm-cerfcube       arm-shannon       mips-ip27            powerpc-mpc836x_mds
arm-clps7500       arm-shark         mips-ip32            powerpc-mpc8540_ads
arm-collie         arm-simpad        mips-jazz            powerpc-mpc8544_ds
arm-corgi          arm-spitz         mips-jmr3927         powerpc-mpc8560_ads
arm-csb337         arm-trizeps4      mips-malta           powerpc-mpc8568mds
arm-csb637         arm-versatile     mips-mipssim         powerpc-mpc85xx_cds
arm-ebsa110        i386              mips-mpc30x          powerpc-mpc8641_hpcn
arm-edb7211        i386-allnoconfig  mips-msp71xx         powerpc-mpc866_ads
arm-em_x270        i386-defconfig    mips-ocelot          powerpc-mpc885_ads
arm-ep93xx         i386-up           mips-pb1100          powerpc-pasemi
arm-footbridge     ia64              mips-pb1500          powerpc-pmac32
arm-fortunet       ia64-allnoconfig  mips-pb1550          powerpc-ppc64
arm-h3600          ia64-bigsur       mips-pnx8550-jbs     powerpc-prpmc2800
arm-h7201          ia64-defconfig    mips-pnx8550-stb810  powerpc-ps3
arm-h7202          ia64-gensparse    mips-qemu            powerpc-pseries
arm-hackkit        ia64-sim          mips-rbhma4200       powerpc-up
arm-integrator     ia64-sn2          mips-rbhma4500       s390
arm-iop13xx        ia64-tiger        mips-rm200           s390-allnoconfig
arm-iop32x         ia64-up           mips-sb1250-swarm    s390-defconfig
arm-iop33x         ia64-zx1          mips-sead            s390-up
arm-ixp2000        m68k              mips-tb0219          sparc
arm-ixp23xx        m68k-amiga        mips-tb0226          sparc-allnoconfig
arm-ixp4xx         m68k-apollo       mips-tb0287          sparc-defconfig
arm-jornada720     m68k-atari        mips-workpad         sparc-up
arm-kafa           m68k-bvme6000     mips-wrppmc          sparc64
arm-kb9202         m68k-hp300        mips-yosemite        sparc64-allnoconfig
arm-ks8695         m68k-mac          parisc               sparc64-defconfig
arm-lart           m68k-mvme147      parisc-allnoconfig   sparc64-up
arm-lpd270         m68k-mvme16x      parisc-defconfig     um-x86_64
arm-lpd7a400       m68k-q40          parisc-up            x86_64
arm-lpd7a404       m68k-sun3         powerpc              x86_64-allnoconfig
arm-lubbock        m68k-sun3x        powerpc-cell         x86_64-defconfig
arm-lusl7200       mips              powerpc-celleb       x86_64-up
arm-mainstone      mips-atlas        powerpc-chrp32

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-07-29 17:09:29 -07:00

486 lines
13 KiB
C

/*
* Cell Broadband Engine OProfile Support
*
* (C) Copyright IBM Corporation 2006
*
* Author: Maynard Johnson <maynardj@us.ibm.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
/* The purpose of this file is to handle SPU event task switching
* and to record SPU context information into the OProfile
* event buffer.
*
* Additionally, the spu_sync_buffer function is provided as a helper
* for recoding actual SPU program counter samples to the event buffer.
*/
#include <linux/dcookies.h>
#include <linux/kref.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/notifier.h>
#include <linux/numa.h>
#include <linux/oprofile.h>
#include <linux/spinlock.h>
#include "pr_util.h"
#define RELEASE_ALL 9999
static DEFINE_SPINLOCK(buffer_lock);
static DEFINE_SPINLOCK(cache_lock);
static int num_spu_nodes;
int spu_prof_num_nodes;
int last_guard_val[MAX_NUMNODES * 8];
/* Container for caching information about an active SPU task. */
struct cached_info {
struct vma_to_fileoffset_map *map;
struct spu *the_spu; /* needed to access pointer to local_store */
struct kref cache_ref;
};
static struct cached_info *spu_info[MAX_NUMNODES * 8];
static void destroy_cached_info(struct kref *kref)
{
struct cached_info *info;
info = container_of(kref, struct cached_info, cache_ref);
vma_map_free(info->map);
kfree(info);
module_put(THIS_MODULE);
}
/* Return the cached_info for the passed SPU number.
* ATTENTION: Callers are responsible for obtaining the
* cache_lock if needed prior to invoking this function.
*/
static struct cached_info *get_cached_info(struct spu *the_spu, int spu_num)
{
struct kref *ref;
struct cached_info *ret_info;
if (spu_num >= num_spu_nodes) {
printk(KERN_ERR "SPU_PROF: "
"%s, line %d: Invalid index %d into spu info cache\n",
__FUNCTION__, __LINE__, spu_num);
ret_info = NULL;
goto out;
}
if (!spu_info[spu_num] && the_spu) {
ref = spu_get_profile_private_kref(the_spu->ctx);
if (ref) {
spu_info[spu_num] = container_of(ref, struct cached_info, cache_ref);
kref_get(&spu_info[spu_num]->cache_ref);
}
}
ret_info = spu_info[spu_num];
out:
return ret_info;
}
/* Looks for cached info for the passed spu. If not found, the
* cached info is created for the passed spu.
* Returns 0 for success; otherwise, -1 for error.
*/
static int
prepare_cached_spu_info(struct spu *spu, unsigned long objectId)
{
unsigned long flags;
struct vma_to_fileoffset_map *new_map;
int retval = 0;
struct cached_info *info;
/* We won't bother getting cache_lock here since
* don't do anything with the cached_info that's returned.
*/
info = get_cached_info(spu, spu->number);
if (info) {
pr_debug("Found cached SPU info.\n");
goto out;
}
/* Create cached_info and set spu_info[spu->number] to point to it.
* spu->number is a system-wide value, not a per-node value.
*/
info = kzalloc(sizeof(struct cached_info), GFP_KERNEL);
if (!info) {
printk(KERN_ERR "SPU_PROF: "
"%s, line %d: create vma_map failed\n",
__FUNCTION__, __LINE__);
retval = -ENOMEM;
goto err_alloc;
}
new_map = create_vma_map(spu, objectId);
if (!new_map) {
printk(KERN_ERR "SPU_PROF: "
"%s, line %d: create vma_map failed\n",
__FUNCTION__, __LINE__);
retval = -ENOMEM;
goto err_alloc;
}
pr_debug("Created vma_map\n");
info->map = new_map;
info->the_spu = spu;
kref_init(&info->cache_ref);
spin_lock_irqsave(&cache_lock, flags);
spu_info[spu->number] = info;
/* Increment count before passing off ref to SPUFS. */
kref_get(&info->cache_ref);
/* We increment the module refcount here since SPUFS is
* responsible for the final destruction of the cached_info,
* and it must be able to access the destroy_cached_info()
* function defined in the OProfile module. We decrement
* the module refcount in destroy_cached_info.
*/
try_module_get(THIS_MODULE);
spu_set_profile_private_kref(spu->ctx, &info->cache_ref,
destroy_cached_info);
spin_unlock_irqrestore(&cache_lock, flags);
goto out;
err_alloc:
kfree(info);
out:
return retval;
}
/*
* NOTE: The caller is responsible for locking the
* cache_lock prior to calling this function.
*/
static int release_cached_info(int spu_index)
{
int index, end;
if (spu_index == RELEASE_ALL) {
end = num_spu_nodes;
index = 0;
} else {
if (spu_index >= num_spu_nodes) {
printk(KERN_ERR "SPU_PROF: "
"%s, line %d: "
"Invalid index %d into spu info cache\n",
__FUNCTION__, __LINE__, spu_index);
goto out;
}
end = spu_index + 1;
index = spu_index;
}
for (; index < end; index++) {
if (spu_info[index]) {
kref_put(&spu_info[index]->cache_ref,
destroy_cached_info);
spu_info[index] = NULL;
}
}
out:
return 0;
}
/* The source code for fast_get_dcookie was "borrowed"
* from drivers/oprofile/buffer_sync.c.
*/
/* Optimisation. We can manage without taking the dcookie sem
* because we cannot reach this code without at least one
* dcookie user still being registered (namely, the reader
* of the event buffer).
*/
static inline unsigned long fast_get_dcookie(struct dentry *dentry,
struct vfsmount *vfsmnt)
{
unsigned long cookie;
if (dentry->d_cookie)
return (unsigned long)dentry;
get_dcookie(dentry, vfsmnt, &cookie);
return cookie;
}
/* Look up the dcookie for the task's first VM_EXECUTABLE mapping,
* which corresponds loosely to "application name". Also, determine
* the offset for the SPU ELF object. If computed offset is
* non-zero, it implies an embedded SPU object; otherwise, it's a
* separate SPU binary, in which case we retrieve it's dcookie.
* For the embedded case, we must determine if SPU ELF is embedded
* in the executable application or another file (i.e., shared lib).
* If embedded in a shared lib, we must get the dcookie and return
* that to the caller.
*/
static unsigned long
get_exec_dcookie_and_offset(struct spu *spu, unsigned int *offsetp,
unsigned long *spu_bin_dcookie,
unsigned long spu_ref)
{
unsigned long app_cookie = 0;
unsigned int my_offset = 0;
struct file *app = NULL;
struct vm_area_struct *vma;
struct mm_struct *mm = spu->mm;
if (!mm)
goto out;
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (!vma->vm_file)
continue;
if (!(vma->vm_flags & VM_EXECUTABLE))
continue;
app_cookie = fast_get_dcookie(vma->vm_file->f_dentry,
vma->vm_file->f_vfsmnt);
pr_debug("got dcookie for %s\n",
vma->vm_file->f_dentry->d_name.name);
app = vma->vm_file;
break;
}
for (vma = mm->mmap; vma; vma = vma->vm_next) {
if (vma->vm_start > spu_ref || vma->vm_end <= spu_ref)
continue;
my_offset = spu_ref - vma->vm_start;
if (!vma->vm_file)
goto fail_no_image_cookie;
pr_debug("Found spu ELF at %X(object-id:%lx) for file %s\n",
my_offset, spu_ref,
vma->vm_file->f_dentry->d_name.name);
*offsetp = my_offset;
break;
}
*spu_bin_dcookie = fast_get_dcookie(vma->vm_file->f_dentry,
vma->vm_file->f_vfsmnt);
pr_debug("got dcookie for %s\n", vma->vm_file->f_dentry->d_name.name);
up_read(&mm->mmap_sem);
out:
return app_cookie;
fail_no_image_cookie:
up_read(&mm->mmap_sem);
printk(KERN_ERR "SPU_PROF: "
"%s, line %d: Cannot find dcookie for SPU binary\n",
__FUNCTION__, __LINE__);
goto out;
}
/* This function finds or creates cached context information for the
* passed SPU and records SPU context information into the OProfile
* event buffer.
*/
static int process_context_switch(struct spu *spu, unsigned long objectId)
{
unsigned long flags;
int retval;
unsigned int offset = 0;
unsigned long spu_cookie = 0, app_dcookie;
retval = prepare_cached_spu_info(spu, objectId);
if (retval)
goto out;
/* Get dcookie first because a mutex_lock is taken in that
* code path, so interrupts must not be disabled.
*/
app_dcookie = get_exec_dcookie_and_offset(spu, &offset, &spu_cookie, objectId);
if (!app_dcookie || !spu_cookie) {
retval = -ENOENT;
goto out;
}
/* Record context info in event buffer */
spin_lock_irqsave(&buffer_lock, flags);
add_event_entry(ESCAPE_CODE);
add_event_entry(SPU_CTX_SWITCH_CODE);
add_event_entry(spu->number);
add_event_entry(spu->pid);
add_event_entry(spu->tgid);
add_event_entry(app_dcookie);
add_event_entry(spu_cookie);
add_event_entry(offset);
spin_unlock_irqrestore(&buffer_lock, flags);
smp_wmb(); /* insure spu event buffer updates are written */
/* don't want entries intermingled... */
out:
return retval;
}
/*
* This function is invoked on either a bind_context or unbind_context.
* If called for an unbind_context, the val arg is 0; otherwise,
* it is the object-id value for the spu context.
* The data arg is of type 'struct spu *'.
*/
static int spu_active_notify(struct notifier_block *self, unsigned long val,
void *data)
{
int retval;
unsigned long flags;
struct spu *the_spu = data;
pr_debug("SPU event notification arrived\n");
if (!val) {
spin_lock_irqsave(&cache_lock, flags);
retval = release_cached_info(the_spu->number);
spin_unlock_irqrestore(&cache_lock, flags);
} else {
retval = process_context_switch(the_spu, val);
}
return retval;
}
static struct notifier_block spu_active = {
.notifier_call = spu_active_notify,
};
static int number_of_online_nodes(void)
{
u32 cpu; u32 tmp;
int nodes = 0;
for_each_online_cpu(cpu) {
tmp = cbe_cpu_to_node(cpu) + 1;
if (tmp > nodes)
nodes++;
}
return nodes;
}
/* The main purpose of this function is to synchronize
* OProfile with SPUFS by registering to be notified of
* SPU task switches.
*
* NOTE: When profiling SPUs, we must ensure that only
* spu_sync_start is invoked and not the generic sync_start
* in drivers/oprofile/oprof.c. A return value of
* SKIP_GENERIC_SYNC or SYNC_START_ERROR will
* accomplish this.
*/
int spu_sync_start(void)
{
int k;
int ret = SKIP_GENERIC_SYNC;
int register_ret;
unsigned long flags = 0;
spu_prof_num_nodes = number_of_online_nodes();
num_spu_nodes = spu_prof_num_nodes * 8;
spin_lock_irqsave(&buffer_lock, flags);
add_event_entry(ESCAPE_CODE);
add_event_entry(SPU_PROFILING_CODE);
add_event_entry(num_spu_nodes);
spin_unlock_irqrestore(&buffer_lock, flags);
/* Register for SPU events */
register_ret = spu_switch_event_register(&spu_active);
if (register_ret) {
ret = SYNC_START_ERROR;
goto out;
}
for (k = 0; k < (MAX_NUMNODES * 8); k++)
last_guard_val[k] = 0;
pr_debug("spu_sync_start -- running.\n");
out:
return ret;
}
/* Record SPU program counter samples to the oprofile event buffer. */
void spu_sync_buffer(int spu_num, unsigned int *samples,
int num_samples)
{
unsigned long long file_offset;
unsigned long flags;
int i;
struct vma_to_fileoffset_map *map;
struct spu *the_spu;
unsigned long long spu_num_ll = spu_num;
unsigned long long spu_num_shifted = spu_num_ll << 32;
struct cached_info *c_info;
/* We need to obtain the cache_lock here because it's
* possible that after getting the cached_info, the SPU job
* corresponding to this cached_info may end, thus resulting
* in the destruction of the cached_info.
*/
spin_lock_irqsave(&cache_lock, flags);
c_info = get_cached_info(NULL, spu_num);
if (!c_info) {
/* This legitimately happens when the SPU task ends before all
* samples are recorded.
* No big deal -- so we just drop a few samples.
*/
pr_debug("SPU_PROF: No cached SPU contex "
"for SPU #%d. Dropping samples.\n", spu_num);
goto out;
}
map = c_info->map;
the_spu = c_info->the_spu;
spin_lock(&buffer_lock);
for (i = 0; i < num_samples; i++) {
unsigned int sample = *(samples+i);
int grd_val = 0;
file_offset = 0;
if (sample == 0)
continue;
file_offset = vma_map_lookup( map, sample, the_spu, &grd_val);
/* If overlays are used by this SPU application, the guard
* value is non-zero, indicating which overlay section is in
* use. We need to discard samples taken during the time
* period which an overlay occurs (i.e., guard value changes).
*/
if (grd_val && grd_val != last_guard_val[spu_num]) {
last_guard_val[spu_num] = grd_val;
/* Drop the rest of the samples. */
break;
}
add_event_entry(file_offset | spu_num_shifted);
}
spin_unlock(&buffer_lock);
out:
spin_unlock_irqrestore(&cache_lock, flags);
}
int spu_sync_stop(void)
{
unsigned long flags = 0;
int ret = spu_switch_event_unregister(&spu_active);
if (ret) {
printk(KERN_ERR "SPU_PROF: "
"%s, line %d: spu_switch_event_unregister returned %d\n",
__FUNCTION__, __LINE__, ret);
goto out;
}
spin_lock_irqsave(&cache_lock, flags);
ret = release_cached_info(RELEASE_ALL);
spin_unlock_irqrestore(&cache_lock, flags);
out:
pr_debug("spu_sync_stop -- done.\n");
return ret;
}