static void __init gic_pm_init(struct gic_chip_data *gic)
{
gic->saved_ppi_enable = __alloc_percpu(DIV_ROUND_UP(32, 32) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_enable);
gic->saved_ppi_conf = __alloc_percpu(DIV_ROUND_UP(32, 16) * 4,
sizeof(u32));
BUG_ON(!gic->saved_ppi_conf);
cpu_pm_register_notifier(&gic_notifier_block);
}
void __percpu *__alloc_percpu_gfp(size_t size, size_t align, gfp_t gfp)
{
void __percpu *p;
int i;
/* older kernel do not allow all GFP flags, specifically atomic
* allocation.
*/
if (gfp & ~(GFP_KERNEL | __GFP_ZERO))
return NULL;
p = __alloc_percpu(size, align);
if (!p)
return p;
if (!(gfp & __GFP_ZERO))
return p;
for_each_possible_cpu(i) {
void *d;
d = per_cpu_ptr(p, i);
memset(d, 0, size);
}
return p;
}
/*
* Mempool for percpu memory.
*/
static void *percpu_mempool_alloc_fn(gfp_t gfp_mask, void *data)
{
struct percpu_mempool *pcpu_pool = data;
void __percpu *p;
/*
* Percpu allocator doesn't do NOIO. This makes percpu mempool
* always try reserved elements first, which isn't such a bad idea
* given that percpu allocator is pretty heavy and percpu areas are
* expensive.
*/
if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL)
return NULL;
p = __alloc_percpu(pcpu_pool->size, pcpu_pool->align);
return (void __kernel __force *)p;
}
/**
* percpu_ida_init - initialize a percpu tag pool
* @pool: pool to initialize
* @nr_tags: number of tags that will be available for allocation
*
* Initializes @pool so that it can be used to allocate tags - integers in the
* range [0, nr_tags). Typically, they'll be used by driver code to refer to a
* preallocated array of tag structures.
*
* Allocation is percpu, but sharding is limited by nr_tags - for best
* performance, the workload should not span more cpus than nr_tags / 128.
*/
int __percpu_ida_init(struct percpu_ida *pool, unsigned long nr_tags,
unsigned long max_size, unsigned long batch_size)
{
unsigned i, cpu, order;
memset(pool, 0, sizeof(*pool));
init_waitqueue_head(&pool->wait);
spin_lock_init(&pool->lock);
pool->nr_tags = nr_tags;
pool->percpu_max_size = max_size;
pool->percpu_batch_size = batch_size;
/* Guard against overflow */
if (nr_tags > (unsigned) INT_MAX + 1) {
pr_err("percpu_ida_init(): nr_tags too large\n");
return -EINVAL;
}
order = get_order(nr_tags * sizeof(unsigned));
pool->freelist = (void *) __get_free_pages(GFP_KERNEL, order);
if (!pool->freelist)
return -ENOMEM;
for (i = 0; i < nr_tags; i++)
pool->freelist[i] = i;
pool->nr_free = nr_tags;
pool->tag_cpu = __alloc_percpu(sizeof(struct percpu_ida_cpu) +
pool->percpu_max_size * sizeof(unsigned),
sizeof(unsigned));
if (!pool->tag_cpu)
goto err;
for_each_possible_cpu(cpu)
spin_lock_init(&per_cpu_ptr(pool->tag_cpu, cpu)->lock);
return 0;
err:
percpu_ida_destroy(pool);
return -ENOMEM;
}
static void __init sve_efi_setup(void)
{
if (!IS_ENABLED(CONFIG_EFI))
return;
/*
* alloc_percpu() warns and prints a backtrace if this goes wrong.
* This is evidence of a crippled system and we are returning void,
* so no attempt is made to handle this situation here.
*/
if (!sve_vl_valid(sve_max_vl))
goto fail;
efi_sve_state = __alloc_percpu(
SVE_SIG_REGS_SIZE(sve_vq_from_vl(sve_max_vl)), SVE_VQ_BYTES);
if (!efi_sve_state)
goto fail;
return;
fail:
panic("Cannot allocate percpu memory for EFI SVE save/restore");
}
static int
pcpu_alloc_test(void)
{
int rv = 0;
#ifndef CONFIG_NEED_PER_CPU_KM
void __percpu **pcpu;
size_t size, align;
int i;
pcpu = vmalloc(sizeof(void __percpu *) * 35000);
if (!pcpu)
return -1;
for (i = 0; i < 35000; i++) {
unsigned int r;
get_random_bytes(&r, sizeof(i));
size = (r % (PAGE_SIZE / 4)) + 1;
/*
* Maximum PAGE_SIZE
*/
get_random_bytes(&r, sizeof(i));
align = 1 << ((i % 11) + 1);
pcpu[i] = __alloc_percpu(size, align);
if (!pcpu[i])
rv = -1;
}
for (i = 0; i < 35000; i++)
free_percpu(pcpu[i]);
vfree(pcpu);
#endif
return rv;
}
static int __init xen_guest_init(void)
{
struct xen_add_to_physmap xatp;
static struct shared_info *shared_info_page = 0;
struct device_node *node;
int len;
const char *s = NULL;
const char *version = NULL;
const char *xen_prefix = "xen,xen-";
struct resource res;
node = of_find_compatible_node(NULL, NULL, "xen,xen");
if (!node) {
pr_debug("No Xen support\n");
return 0;
}
s = of_get_property(node, "compatible", &len);
if (strlen(xen_prefix) + 3 < len &&
!strncmp(xen_prefix, s, strlen(xen_prefix)))
version = s + strlen(xen_prefix);
if (version == NULL) {
pr_debug("Xen version not found\n");
return 0;
}
if (of_address_to_resource(node, GRANT_TABLE_PHYSADDR, &res))
return 0;
xen_hvm_resume_frames = res.start >> PAGE_SHIFT;
xen_events_irq = irq_of_parse_and_map(node, 0);
pr_info("Xen %s support found, events_irq=%d gnttab_frame_pfn=%lx\n",
version, xen_events_irq, xen_hvm_resume_frames);
xen_domain_type = XEN_HVM_DOMAIN;
xen_setup_features();
if (xen_feature(XENFEAT_dom0))
xen_start_info->flags |= SIF_INITDOMAIN|SIF_PRIVILEGED;
else
xen_start_info->flags &= ~(SIF_INITDOMAIN|SIF_PRIVILEGED);
if (!shared_info_page)
shared_info_page = (struct shared_info *)
get_zeroed_page(GFP_KERNEL);
if (!shared_info_page) {
pr_err("not enough memory\n");
return -ENOMEM;
}
xatp.domid = DOMID_SELF;
xatp.idx = 0;
xatp.space = XENMAPSPACE_shared_info;
xatp.gpfn = __pa(shared_info_page) >> PAGE_SHIFT;
if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
BUG();
HYPERVISOR_shared_info = (struct shared_info *)shared_info_page;
/* xen_vcpu is a pointer to the vcpu_info struct in the shared_info
* page, we use it in the event channel upcall and in some pvclock
* related functions.
* The shared info contains exactly 1 CPU (the boot CPU). The guest
* is required to use VCPUOP_register_vcpu_info to place vcpu info
* for secondary CPUs as they are brought up.
* For uniformity we use VCPUOP_register_vcpu_info even on cpu0.
*/
xen_vcpu_info = __alloc_percpu(sizeof(struct vcpu_info),
sizeof(struct vcpu_info));
if (xen_vcpu_info == NULL)
return -ENOMEM;
gnttab_init();
if (!xen_initial_domain())
xenbus_probe(NULL);
return 0;
}
struct net_device *batadv_softif_create(const char *name)
{
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
int ret;
size_t cnt_len = sizeof(uint64_t) * BATADV_CNT_NUM;
soft_iface = alloc_netdev(sizeof(*bat_priv), name,
batadv_interface_setup);
if (!soft_iface)
goto out;
bat_priv = netdev_priv(soft_iface);
bat_priv->soft_iface = soft_iface;
INIT_WORK(&bat_priv->cleanup_work, batadv_softif_destroy_finish);
/* batadv_interface_stats() needs to be available as soon as
* register_netdevice() has been called
*/
bat_priv->bat_counters = __alloc_percpu(cnt_len, __alignof__(uint64_t));
if (!bat_priv->bat_counters)
goto free_soft_iface;
ret = register_netdevice(soft_iface);
if (ret < 0) {
pr_err("Unable to register the batman interface '%s': %i\n",
name, ret);
goto free_bat_counters;
}
atomic_set(&bat_priv->aggregated_ogms, 1);
atomic_set(&bat_priv->bonding, 0);
#ifdef CONFIG_BATMAN_ADV_BLA
atomic_set(&bat_priv->bridge_loop_avoidance, 0);
#endif
#ifdef CONFIG_BATMAN_ADV_DAT
atomic_set(&bat_priv->distributed_arp_table, 1);
#endif
atomic_set(&bat_priv->ap_isolation, 0);
atomic_set(&bat_priv->vis_mode, BATADV_VIS_TYPE_CLIENT_UPDATE);
atomic_set(&bat_priv->gw_mode, BATADV_GW_MODE_OFF);
atomic_set(&bat_priv->gw_sel_class, 20);
atomic_set(&bat_priv->gw_bandwidth, 41);
atomic_set(&bat_priv->orig_interval, 1000);
atomic_set(&bat_priv->hop_penalty, 30);
#ifdef CONFIG_BATMAN_ADV_DEBUG
atomic_set(&bat_priv->log_level, 0);
#endif
atomic_set(&bat_priv->fragmentation, 1);
atomic_set(&bat_priv->bcast_queue_left, BATADV_BCAST_QUEUE_LEN);
atomic_set(&bat_priv->batman_queue_left, BATADV_BATMAN_QUEUE_LEN);
atomic_set(&bat_priv->mesh_state, BATADV_MESH_INACTIVE);
atomic_set(&bat_priv->bcast_seqno, 1);
atomic_set(&bat_priv->tt.vn, 0);
atomic_set(&bat_priv->tt.local_changes, 0);
atomic_set(&bat_priv->tt.ogm_append_cnt, 0);
#ifdef CONFIG_BATMAN_ADV_BLA
atomic_set(&bat_priv->bla.num_requests, 0);
#endif
bat_priv->tt.last_changeset = NULL;
bat_priv->tt.last_changeset_len = 0;
bat_priv->primary_if = NULL;
bat_priv->num_ifaces = 0;
ret = batadv_algo_select(bat_priv, batadv_routing_algo);
if (ret < 0)
goto unreg_soft_iface;
ret = batadv_sysfs_add_meshif(soft_iface);
if (ret < 0)
goto unreg_soft_iface;
ret = batadv_debugfs_add_meshif(soft_iface);
if (ret < 0)
goto unreg_sysfs;
ret = batadv_mesh_init(soft_iface);
if (ret < 0)
goto unreg_debugfs;
return soft_iface;
unreg_debugfs:
batadv_debugfs_del_meshif(soft_iface);
unreg_sysfs:
batadv_sysfs_del_meshif(soft_iface);
unreg_soft_iface:
free_percpu(bat_priv->bat_counters);
unregister_netdevice(soft_iface);
return NULL;
free_bat_counters:
free_percpu(bat_priv->bat_counters);
free_soft_iface:
free_netdev(soft_iface);
out:
return NULL;
}
/*
* Setup everything required to start tracing
*/
int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
struct blk_user_trace_setup *buts)
{
struct blk_trace *old_bt, *bt = NULL;
struct dentry *dir = NULL;
int ret, i;
if (!buts->buf_size || !buts->buf_nr)
return -EINVAL;
strncpy(buts->name, name, BLKTRACE_BDEV_SIZE);
buts->name[BLKTRACE_BDEV_SIZE - 1] = '\0';
/*
* some device names have larger paths - convert the slashes
* to underscores for this to work as expected
*/
for (i = 0; i < strlen(buts->name); i++)
if (buts->name[i] == '/')
buts->name[i] = '_';
ret = -ENOMEM;
bt = kzalloc(sizeof(*bt), GFP_KERNEL);
if (!bt)
goto err;
bt->sequence = alloc_percpu(unsigned long);
if (!bt->sequence)
goto err;
bt->msg_data = __alloc_percpu(BLK_TN_MAX_MSG);
if (!bt->msg_data)
goto err;
ret = -ENOENT;
if (!blk_tree_root) {
blk_tree_root = debugfs_create_dir("block", NULL);
if (!blk_tree_root)
return -ENOMEM;
}
dir = debugfs_create_dir(buts->name, blk_tree_root);
if (!dir)
goto err;
bt->dir = dir;
bt->dev = dev;
atomic_set(&bt->dropped, 0);
ret = -EIO;
bt->dropped_file = debugfs_create_file("dropped", 0444, dir, bt, &blk_dropped_fops);
if (!bt->dropped_file)
goto err;
bt->msg_file = debugfs_create_file("msg", 0222, dir, bt, &blk_msg_fops);
if (!bt->msg_file)
goto err;
bt->rchan = relay_open("trace", dir, buts->buf_size,
buts->buf_nr, &blk_relay_callbacks, bt);
if (!bt->rchan)
goto err;
bt->act_mask = buts->act_mask;
if (!bt->act_mask)
bt->act_mask = (u16) -1;
bt->start_lba = buts->start_lba;
bt->end_lba = buts->end_lba;
if (!bt->end_lba)
bt->end_lba = -1ULL;
bt->pid = buts->pid;
bt->trace_state = Blktrace_setup;
mutex_lock(&blk_probe_mutex);
if (atomic_add_return(1, &blk_probes_ref) == 1) {
ret = blk_register_tracepoints();
if (ret)
goto probe_err;
}
mutex_unlock(&blk_probe_mutex);
ret = -EBUSY;
old_bt = xchg(&q->blk_trace, bt);
if (old_bt) {
(void) xchg(&q->blk_trace, old_bt);
goto err;
}
return 0;
probe_err:
atomic_dec(&blk_probes_ref);
mutex_unlock(&blk_probe_mutex);
err:
if (bt) {
if (bt->msg_file)
debugfs_remove(bt->msg_file);
if (bt->dropped_file)
debugfs_remove(bt->dropped_file);
free_percpu(bt->sequence);
free_percpu(bt->msg_data);
if (bt->rchan)
relay_close(bt->rchan);
kfree(bt);
}
return ret;
}
/* kernel commit f2a8205c */
void foo (void) {
(void) __alloc_percpu(sizeof(int), 8);
}