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-rw-r--r--crypto/pcrypt.c191
-rw-r--r--include/linux/padata.h116
-rw-r--r--kernel/padata.c471
3 files changed, 564 insertions, 214 deletions
diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c
index 6036b6de907..c9662e25595 100644
--- a/crypto/pcrypt.c
+++ b/crypto/pcrypt.c
@@ -24,12 +24,38 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/notifier.h>
#include <crypto/pcrypt.h>
-static struct padata_instance *pcrypt_enc_padata;
-static struct padata_instance *pcrypt_dec_padata;
-static struct workqueue_struct *encwq;
-static struct workqueue_struct *decwq;
+struct pcrypt_instance {
+ struct padata_instance *pinst;
+ struct workqueue_struct *wq;
+
+ /*
+ * Cpumask for callback CPUs. It should be
+ * equal to serial cpumask of corresponding padata instance,
+ * so it is updated when padata notifies us about serial
+ * cpumask change.
+ *
+ * cb_cpumask is protected by RCU. This fact prevents us from
+ * using cpumask_var_t directly because the actual type of
+ * cpumsak_var_t depends on kernel configuration(particularly on
+ * CONFIG_CPUMASK_OFFSTACK macro). Depending on the configuration
+ * cpumask_var_t may be either a pointer to the struct cpumask
+ * or a variable allocated on the stack. Thus we can not safely use
+ * cpumask_var_t with RCU operations such as rcu_assign_pointer or
+ * rcu_dereference. So cpumask_var_t is wrapped with struct
+ * pcrypt_cpumask which makes possible to use it with RCU.
+ */
+ struct pcrypt_cpumask {
+ cpumask_var_t mask;
+ } *cb_cpumask;
+ struct notifier_block nblock;
+};
+
+static struct pcrypt_instance pencrypt;
+static struct pcrypt_instance pdecrypt;
+
struct pcrypt_instance_ctx {
struct crypto_spawn spawn;
@@ -42,25 +68,29 @@ struct pcrypt_aead_ctx {
};
static int pcrypt_do_parallel(struct padata_priv *padata, unsigned int *cb_cpu,
- struct padata_instance *pinst)
+ struct pcrypt_instance *pcrypt)
{
unsigned int cpu_index, cpu, i;
+ struct pcrypt_cpumask *cpumask;
cpu = *cb_cpu;
- if (cpumask_test_cpu(cpu, cpu_active_mask))
+ rcu_read_lock_bh();
+ cpumask = rcu_dereference(pcrypt->cb_cpumask);
+ if (cpumask_test_cpu(cpu, cpumask->mask))
goto out;
- cpu_index = cpu % cpumask_weight(cpu_active_mask);
+ cpu_index = cpu % cpumask_weight(cpumask->mask);
- cpu = cpumask_first(cpu_active_mask);
+ cpu = cpumask_first(cpumask->mask);
for (i = 0; i < cpu_index; i++)
- cpu = cpumask_next(cpu, cpu_active_mask);
+ cpu = cpumask_next(cpu, cpumask->mask);
*cb_cpu = cpu;
out:
- return padata_do_parallel(pinst, padata, cpu);
+ rcu_read_unlock_bh();
+ return padata_do_parallel(pcrypt->pinst, padata, cpu);
}
static int pcrypt_aead_setkey(struct crypto_aead *parent,
@@ -142,7 +172,7 @@ static int pcrypt_aead_encrypt(struct aead_request *req)
req->cryptlen, req->iv);
aead_request_set_assoc(creq, req->assoc, req->assoclen);
- err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
+ err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
if (!err)
return -EINPROGRESS;
@@ -184,7 +214,7 @@ static int pcrypt_aead_decrypt(struct aead_request *req)
req->cryptlen, req->iv);
aead_request_set_assoc(creq, req->assoc, req->assoclen);
- err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_dec_padata);
+ err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pdecrypt);
if (!err)
return -EINPROGRESS;
@@ -228,7 +258,7 @@ static int pcrypt_aead_givencrypt(struct aead_givcrypt_request *req)
aead_givcrypt_set_assoc(creq, areq->assoc, areq->assoclen);
aead_givcrypt_set_giv(creq, req->giv, req->seq);
- err = pcrypt_do_parallel(padata, &ctx->cb_cpu, pcrypt_enc_padata);
+ err = pcrypt_do_parallel(padata, &ctx->cb_cpu, &pencrypt);
if (!err)
return -EINPROGRESS;
@@ -370,6 +400,88 @@ static void pcrypt_free(struct crypto_instance *inst)
kfree(inst);
}
+static int pcrypt_cpumask_change_notify(struct notifier_block *self,
+ unsigned long val, void *data)
+{
+ struct pcrypt_instance *pcrypt;
+ struct pcrypt_cpumask *new_mask, *old_mask;
+
+ if (!(val & PADATA_CPU_SERIAL))
+ return 0;
+
+ pcrypt = container_of(self, struct pcrypt_instance, nblock);
+ new_mask = kmalloc(sizeof(*new_mask), GFP_KERNEL);
+ if (!new_mask)
+ return -ENOMEM;
+ if (!alloc_cpumask_var(&new_mask->mask, GFP_KERNEL)) {
+ kfree(new_mask);
+ return -ENOMEM;
+ }
+
+ old_mask = pcrypt->cb_cpumask;
+
+ padata_get_cpumask(pcrypt->pinst, PADATA_CPU_SERIAL, new_mask->mask);
+ rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
+ synchronize_rcu_bh();
+
+ free_cpumask_var(old_mask->mask);
+ kfree(old_mask);
+ return 0;
+}
+
+static int __pcrypt_init_instance(struct pcrypt_instance *pcrypt,
+ const char *name)
+{
+ int ret = -ENOMEM;
+ struct pcrypt_cpumask *mask;
+
+ pcrypt->wq = create_workqueue(name);
+ if (!pcrypt->wq)
+ goto err;
+
+ pcrypt->pinst = padata_alloc(pcrypt->wq);
+ if (!pcrypt->pinst)
+ goto err_destroy_workqueue;
+
+ mask = kmalloc(sizeof(*mask), GFP_KERNEL);
+ if (!mask)
+ goto err_free_padata;
+ if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
+ kfree(mask);
+ goto err_free_padata;
+ }
+
+ padata_get_cpumask(pcrypt->pinst, PADATA_CPU_SERIAL, mask->mask);
+ rcu_assign_pointer(pcrypt->cb_cpumask, mask);
+
+ pcrypt->nblock.notifier_call = pcrypt_cpumask_change_notify;
+ ret = padata_register_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
+ if (ret)
+ goto err_free_cpumask;
+
+ return ret;
+err_free_cpumask:
+ free_cpumask_var(mask->mask);
+ kfree(mask);
+err_free_padata:
+ padata_free(pcrypt->pinst);
+err_destroy_workqueue:
+ destroy_workqueue(pcrypt->wq);
+err:
+ return ret;
+}
+
+static void __pcrypt_deinit_instance(struct pcrypt_instance *pcrypt)
+{
+ free_cpumask_var(pcrypt->cb_cpumask->mask);
+ kfree(pcrypt->cb_cpumask);
+
+ padata_stop(pcrypt->pinst);
+ padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
+ destroy_workqueue(pcrypt->wq);
+ padata_free(pcrypt->pinst);
+}
+
static struct crypto_template pcrypt_tmpl = {
.name = "pcrypt",
.alloc = pcrypt_alloc,
@@ -379,60 +491,31 @@ static struct crypto_template pcrypt_tmpl = {
static int __init pcrypt_init(void)
{
- int err = -ENOMEM;
- encwq = create_workqueue("pencrypt");
- if (!encwq)
- goto err;
-
- decwq = create_workqueue("pdecrypt");
- if (!decwq)
- goto err_destroy_encwq;
-
-
- pcrypt_enc_padata = padata_alloc(cpu_possible_mask, encwq);
- if (!pcrypt_enc_padata)
- goto err_destroy_decwq;
-
- pcrypt_dec_padata = padata_alloc(cpu_possible_mask, decwq);
- if (!pcrypt_dec_padata)
- goto err_free_enc_padata;
+ int err;
- err = padata_start(pcrypt_enc_padata);
+ err = __pcrypt_init_instance(&pencrypt, "pencrypt");
if (err)
- goto err_free_dec_padata;
+ goto err;
- err = padata_start(pcrypt_dec_padata);
+ err = __pcrypt_init_instance(&pdecrypt, "pdecrypt");
if (err)
- goto err_free_dec_padata;
-
- return crypto_register_template(&pcrypt_tmpl);
-
-err_free_dec_padata:
- padata_free(pcrypt_dec_padata);
+ goto err_deinit_pencrypt;
-err_free_enc_padata:
- padata_free(pcrypt_enc_padata);
+ padata_start(pencrypt.pinst);
+ padata_start(pdecrypt.pinst);
-err_destroy_decwq:
- destroy_workqueue(decwq);
-
-err_destroy_encwq:
- destroy_workqueue(encwq);
+ return crypto_register_template(&pcrypt_tmpl);
+err_deinit_pencrypt:
+ __pcrypt_deinit_instance(&pencrypt);
err:
return err;
}
static void __exit pcrypt_exit(void)
{
- padata_stop(pcrypt_enc_padata);
- padata_stop(pcrypt_dec_padata);
-
- destroy_workqueue(encwq);
- destroy_workqueue(decwq);
-
- padata_free(pcrypt_enc_padata);
- padata_free(pcrypt_dec_padata);
+ __pcrypt_deinit_instance(&pencrypt);
+ __pcrypt_deinit_instance(&pdecrypt);
crypto_unregister_template(&pcrypt_tmpl);
}
diff --git a/include/linux/padata.h b/include/linux/padata.h
index 8844b851191..621e7736690 100644
--- a/include/linux/padata.h
+++ b/include/linux/padata.h
@@ -25,6 +25,10 @@
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/timer.h>
+#include <linux/notifier.h>
+
+#define PADATA_CPU_SERIAL 0x01
+#define PADATA_CPU_PARALLEL 0x02
/**
* struct padata_priv - Embedded to the users data structure.
@@ -59,7 +63,20 @@ struct padata_list {
};
/**
- * struct padata_queue - The percpu padata queues.
+* struct padata_serial_queue - The percpu padata serial queue
+*
+* @serial: List to wait for serialization after reordering.
+* @work: work struct for serialization.
+* @pd: Backpointer to the internal control structure.
+*/
+struct padata_serial_queue {
+ struct padata_list serial;
+ struct work_struct work;
+ struct parallel_data *pd;
+};
+
+/**
+ * struct padata_parallel_queue - The percpu padata parallel queue
*
* @parallel: List to wait for parallelization.
* @reorder: List to wait for reordering after parallel processing.
@@ -67,44 +84,52 @@ struct padata_list {
* @pwork: work struct for parallelization.
* @swork: work struct for serialization.
* @pd: Backpointer to the internal control structure.
+ * @work: work struct for parallelization.
+ * @num_obj: Number of objects that are processed by this cpu.
* @cpu_index: Index of the cpu.
*/
-struct padata_queue {
- struct padata_list parallel;
- struct padata_list reorder;
- struct padata_list serial;
- struct work_struct pwork;
- struct work_struct swork;
- struct parallel_data *pd;
- int cpu_index;
+struct padata_parallel_queue {
+ struct padata_list parallel;
+ struct padata_list reorder;
+ struct parallel_data *pd;
+ struct work_struct work;
+ atomic_t num_obj;
+ int cpu_index;
};
+
/**
* struct parallel_data - Internal control structure, covers everything
* that depends on the cpumask in use.
*
* @pinst: padata instance.
- * @queue: percpu padata queues.
+ * @pqueue: percpu padata queues used for parallelization.
+ * @squeue: percpu padata queues used for serialuzation.
* @seq_nr: The sequence number that will be attached to the next object.
* @reorder_objects: Number of objects waiting in the reorder queues.
* @refcnt: Number of objects holding a reference on this parallel_data.
* @max_seq_nr: Maximal used sequence number.
- * @cpumask: cpumask in use.
+ * @cpumask: Contains two cpumasks: pcpu and cbcpu for
+ * parallel and serial workers respectively.
* @lock: Reorder lock.
* @processed: Number of already processed objects.
* @timer: Reorder timer.
*/
struct parallel_data {
- struct padata_instance *pinst;
- struct padata_queue *queue;
- atomic_t seq_nr;
- atomic_t reorder_objects;
- atomic_t refcnt;
- unsigned int max_seq_nr;
- cpumask_var_t cpumask;
- spinlock_t lock ____cacheline_aligned;
- unsigned int processed;
- struct timer_list timer;
+ struct padata_instance *pinst;
+ struct padata_parallel_queue *pqueue;
+ struct padata_serial_queue *squeue;
+ atomic_t seq_nr;
+ atomic_t reorder_objects;
+ atomic_t refcnt;
+ unsigned int max_seq_nr;
+ struct {
+ cpumask_var_t pcpu;
+ cpumask_var_t cbcpu;
+ } cpumask;
+ spinlock_t lock ____cacheline_aligned;
+ unsigned int processed;
+ struct timer_list timer;
};
/**
@@ -113,32 +138,51 @@ struct parallel_data {
* @cpu_notifier: cpu hotplug notifier.
* @wq: The workqueue in use.
* @pd: The internal control structure.
- * @cpumask: User supplied cpumask.
+ * @cpumask: User supplied cpumask. Contains two cpumasks: pcpu and
+ * cbcpu for parallel and serial works respectivly.
+ * @cpumask_change_notifier: Notifiers chain for user-defined notify
+ * callbacks that will be called when either @pcpu or @cbcpu
+ * or both cpumasks change.
* @lock: padata instance lock.
* @flags: padata flags.
*/
struct padata_instance {
- struct notifier_block cpu_notifier;
- struct workqueue_struct *wq;
- struct parallel_data *pd;
- cpumask_var_t cpumask;
- struct mutex lock;
- u8 flags;
-#define PADATA_INIT 1
-#define PADATA_RESET 2
-#define PADATA_INVALID 4
+ struct notifier_block cpu_notifier;
+ struct workqueue_struct *wq;
+ struct parallel_data *pd;
+ struct {
+ cpumask_var_t pcpu;
+ cpumask_var_t cbcpu;
+ } cpumask;
+ struct blocking_notifier_head cpumask_change_notifier;
+ struct mutex lock;
+ u8 flags;
+#define PADATA_INIT 1
+#define PADATA_RESET 2
+#define PADATA_INVALID 4
};
-extern struct padata_instance *padata_alloc(const struct cpumask *cpumask,
- struct workqueue_struct *wq);
+extern struct padata_instance *padata_alloc(struct workqueue_struct *wq);
+extern struct padata_instance *__padata_alloc(struct workqueue_struct *wq,
+ const struct cpumask *pcpumask,
+ const struct cpumask *cbcpumask);
extern void padata_free(struct padata_instance *pinst);
extern int padata_do_parallel(struct padata_instance *pinst,
struct padata_priv *padata, int cb_cpu);
extern void padata_do_serial(struct padata_priv *padata);
-extern int padata_set_cpumask(struct padata_instance *pinst,
+extern int padata_get_cpumask(struct padata_instance *pinst,
+ int cpumask_type, struct cpumask *out_mask);
+extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
cpumask_var_t cpumask);
-extern int padata_add_cpu(struct padata_instance *pinst, int cpu);
-extern int padata_remove_cpu(struct padata_instance *pinst, int cpu);
+extern int __padata_set_cpumasks(struct padata_instance *pinst,
+ cpumask_var_t pcpumask,
+ cpumask_var_t cbcpumask);
+extern int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask);
+extern int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask);
extern int padata_start(struct padata_instance *pinst);
extern void padata_stop(struct padata_instance *pinst);
+extern int padata_register_cpumask_notifier(struct padata_instance *pinst,
+ struct notifier_block *nblock);
+extern int padata_unregister_cpumask_notifier(struct padata_instance *pinst,
+ struct notifier_block *nblock);
#endif
diff --git a/kernel/padata.c b/kernel/padata.c
index 450d67d394b..84d0ca9dac9 100644
--- a/kernel/padata.c
+++ b/kernel/padata.c
@@ -35,9 +35,9 @@ static int padata_index_to_cpu(struct parallel_data *pd, int cpu_index)
{
int cpu, target_cpu;
- target_cpu = cpumask_first(pd->cpumask);
+ target_cpu = cpumask_first(pd->cpumask.pcpu);
for (cpu = 0; cpu < cpu_index; cpu++)
- target_cpu = cpumask_next(target_cpu, pd->cpumask);
+ target_cpu = cpumask_next(target_cpu, pd->cpumask.pcpu);
return target_cpu;
}
@@ -53,26 +53,27 @@ static int padata_cpu_hash(struct padata_priv *padata)
* Hash the sequence numbers to the cpus by taking
* seq_nr mod. number of cpus in use.
*/
- cpu_index = padata->seq_nr % cpumask_weight(pd->cpumask);
+ cpu_index = padata->seq_nr % cpumask_weight(pd->cpumask.pcpu);
return padata_index_to_cpu(pd, cpu_index);
}
-static void padata_parallel_worker(struct work_struct *work)
+static void padata_parallel_worker(struct work_struct *parallel_work)
{
- struct padata_queue *queue;
+ struct padata_parallel_queue *pqueue;
struct parallel_data *pd;
struct padata_instance *pinst;
LIST_HEAD(local_list);
local_bh_disable();
- queue = container_of(work, struct padata_queue, pwork);
- pd = queue->pd;
+ pqueue = container_of(parallel_work,
+ struct padata_parallel_queue, work);
+ pd = pqueue->pd;
pinst = pd->pinst;
- spin_lock(&queue->parallel.lock);
- list_replace_init(&queue->parallel.list, &local_list);
- spin_unlock(&queue->parallel.lock);
+ spin_lock(&pqueue->parallel.lock);
+ list_replace_init(&pqueue->parallel.list, &local_list);
+ spin_unlock(&pqueue->parallel.lock);
while (!list_empty(&local_list)) {
struct padata_priv *padata;
@@ -94,7 +95,7 @@ static void padata_parallel_worker(struct work_struct *work)
* @pinst: padata instance
* @padata: object to be parallelized
* @cb_cpu: cpu the serialization callback function will run on,
- * must be in the cpumask of padata.
+ * must be in the serial cpumask of padata(i.e. cpumask.cbcpu).
*
* The parallelization callback function will run with BHs off.
* Note: Every object which is parallelized by padata_do_parallel
@@ -104,7 +105,7 @@ int padata_do_parallel(struct padata_instance *pinst,
struct padata_priv *padata, int cb_cpu)
{
int target_cpu, err;
- struct padata_queue *queue;
+ struct padata_parallel_queue *queue;
struct parallel_data *pd;
rcu_read_lock_bh();
@@ -115,7 +116,7 @@ int padata_do_parallel(struct padata_instance *pinst,
if (!(pinst->flags & PADATA_INIT))
goto out;
- if (!cpumask_test_cpu(cb_cpu, pd->cpumask))
+ if (!cpumask_test_cpu(cb_cpu, pd->cpumask.cbcpu))
goto out;
err = -EBUSY;
@@ -136,13 +137,13 @@ int padata_do_parallel(struct padata_instance *pinst,
padata->seq_nr = atomic_inc_return(&pd->seq_nr);
target_cpu = padata_cpu_hash(padata);
- queue = per_cpu_ptr(pd->queue, target_cpu);
+ queue = per_cpu_ptr(pd->pqueue, target_cpu);
spin_lock(&queue->parallel.lock);
list_add_tail(&padata->list, &queue->parallel.list);
spin_unlock(&queue->parallel.lock);
- queue_work_on(target_cpu, pinst->wq, &queue->pwork);
+ queue_work_on(target_cpu, pinst->wq, &queue->work);
out:
rcu_read_unlock_bh();
@@ -172,11 +173,11 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
{
int cpu, num_cpus;
int next_nr, next_index;
- struct padata_queue *queue, *next_queue;
+ struct padata_parallel_queue *queue, *next_queue;
struct padata_priv *padata;
struct padata_list *reorder;
- num_cpus = cpumask_weight(pd->cpumask);
+ num_cpus = cpumask_weight(pd->cpumask.pcpu);
/*
* Calculate the percpu reorder queue and the sequence
@@ -185,13 +186,13 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
next_nr = pd->processed;
next_index = next_nr % num_cpus;
cpu = padata_index_to_cpu(pd, next_index);
- next_queue = per_cpu_ptr(pd->queue, cpu);
+ next_queue = per_cpu_ptr(pd->pqueue, cpu);
if (unlikely(next_nr > pd->max_seq_nr)) {
next_nr = next_nr - pd->max_seq_nr - 1;
next_index = next_nr % num_cpus;
cpu = padata_index_to_cpu(pd, next_index);
- next_queue = per_cpu_ptr(pd->queue, cpu);
+ next_queue = per_cpu_ptr(pd->pqueue, cpu);
pd->processed = 0;
}
@@ -215,7 +216,7 @@ static struct padata_priv *padata_get_next(struct parallel_data *pd)
goto out;
}
- queue = per_cpu_ptr(pd->queue, smp_processor_id());
+ queue = per_cpu_ptr(pd->pqueue, smp_processor_id());
if (queue->cpu_index == next_queue->cpu_index) {
padata = ERR_PTR(-ENODATA);
goto out;
@@ -229,7 +230,7 @@ out:
static void padata_reorder(struct parallel_data *pd)
{
struct padata_priv *padata;
- struct padata_queue *queue;
+ struct padata_serial_queue *squeue;
struct padata_instance *pinst = pd->pinst;
/*
@@ -268,13 +269,13 @@ static void padata_reorder(struct parallel_data *pd)
return;
}
- queue = per_cpu_ptr(pd->queue, padata->cb_cpu);
+ squeue = per_cpu_ptr(pd->squeue, padata->cb_cpu);
- spin_lock(&queue->serial.lock);
- list_add_tail(&padata->list, &queue->serial.list);
- spin_unlock(&queue->serial.lock);
+ spin_lock(&squeue->serial.lock);
+ list_add_tail(&padata->list, &squeue->serial.list);
+ spin_unlock(&squeue->serial.lock);
- queue_work_on(padata->cb_cpu, pinst->wq, &queue->swork);
+ queue_work_on(padata->cb_cpu, pinst->wq, &squeue->work);
}
spin_unlock_bh(&pd->lock);
@@ -300,19 +301,19 @@ static void padata_reorder_timer(unsigned long arg)
padata_reorder(pd);
}
-static void padata_serial_worker(struct work_struct *work)
+static void padata_serial_worker(struct work_struct *serial_work)
{
- struct padata_queue *queue;
+ struct padata_serial_queue *squeue;
struct parallel_data *pd;
LIST_HEAD(local_list);
local_bh_disable();
- queue = container_of(work, struct padata_queue, swork);
- pd = queue->pd;
+ squeue = container_of(serial_work, struct padata_serial_queue, work);
+ pd = squeue->pd;
- spin_lock(&queue->serial.lock);
- list_replace_init(&queue->serial.list, &local_list);
- spin_unlock(&queue->serial.lock);
+ spin_lock(&squeue->serial.lock);
+ list_replace_init(&squeue->serial.list, &local_list);
+ spin_unlock(&squeue->serial.lock);
while (!list_empty(&local_list)) {
struct padata_priv *padata;
@@ -339,18 +340,18 @@ static void padata_serial_worker(struct work_struct *work)
void padata_do_serial(struct padata_priv *padata)
{
int cpu;
- struct padata_queue *queue;
+ struct padata_parallel_queue *pqueue;
struct parallel_data *pd;
pd = padata->pd;
cpu = get_cpu();
- queue = per_cpu_ptr(pd->queue, cpu);
+ pqueue = per_cpu_ptr(pd->pqueue, cpu);
- spin_lock(&queue->reorder.lock);
+ spin_lock(&pqueue->reorder.lock);
atomic_inc(&pd->reorder_objects);
- list_add_tail(&padata->list, &queue->reorder.list);
- spin_unlock(&queue->reorder.lock);
+ list_add_tail(&padata->list, &pqueue->reorder.list);
+ spin_unlock(&pqueue->reorder.lock);
put_cpu();
@@ -358,51 +359,88 @@ void padata_do_serial(struct padata_priv *padata)
}
EXPORT_SYMBOL(padata_do_serial);
-/* Allocate and initialize the internal cpumask dependend resources. */
-static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
- const struct cpumask *cpumask)
+static int padata_setup_cpumasks(struct parallel_data *pd,
+ const struct cpumask *pcpumask,
+ const struct cpumask *cbcpumask)
{
- int cpu, cpu_index, num_cpus;
- struct padata_queue *queue;
- struct parallel_data *pd;
+ if (!alloc_cpumask_var(&pd->cpumask.pcpu, GFP_KERNEL))
+ return -ENOMEM;
- cpu_index = 0;
+ cpumask_and(pd->cpumask.pcpu, pcpumask, cpu_active_mask);
+ if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) {
+ free_cpumask_var(pd->cpumask.cbcpu);
+ return -ENOMEM;
+ }
- pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL);
- if (!pd)
- goto err;
+ cpumask_and(pd->cpumask.cbcpu, cbcpumask, cpu_active_mask);
+ return 0;
+}
- pd->queue = alloc_percpu(struct padata_queue);
- if (!pd->queue)
- goto err_free_pd;
+static void __padata_list_init(struct padata_list *pd_list)
+{
+ INIT_LIST_HEAD(&pd_list->list);
+ spin_lock_init(&pd_list->lock);
+}
- if (!alloc_cpumask_var(&pd->cpumask, GFP_KERNEL))
- goto err_free_queue;
+/* Initialize all percpu queues used by serial workers */
+static void padata_init_squeues(struct parallel_data *pd)
+{
+ int cpu;
+ struct padata_serial_queue *squeue;
- cpumask_and(pd->cpumask, cpumask, cpu_active_mask);
+ for_each_cpu(cpu, pd->cpumask.cbcpu) {
+ squeue = per_cpu_ptr(pd->squeue, cpu);
+ squeue->pd = pd;
+ __padata_list_init(&squeue->serial);
+ INIT_WORK(&squeue->work, padata_serial_worker);
+ }
+}
- for_each_cpu(cpu, pd->cpumask) {
- queue = per_cpu_ptr(pd->queue, cpu);
+/* Initialize all percpu queues used by parallel workers */
+static void padata_init_pqueues(struct parallel_data *pd)
+{
+ int cpu_index, num_cpus, cpu;
+ struct padata_parallel_queue *pqueue;
- queue->pd = pd;
+ cpu_index = 0;
+ for_each_cpu(cpu, pd->cpumask.pcpu) {
+ pqueue = per_cpu_ptr(pd->pqueue, cpu);
+ pqueue->pd = pd;
+ pqueue->cpu_index = cpu_index;
+
+ __padata_list_init(&pqueue->reorder);
+ __padata_list_init(&pqueue->parallel);
+ INIT_WORK(&pqueue->work, padata_parallel_worker);
+ atomic_set(&pqueue->num_obj, 0);
+ }
- queue->cpu_index = cpu_index;
- cpu_index++;
+ num_cpus = cpumask_weight(pd->cpumask.pcpu);
+ pd->max_seq_nr = (MAX_SEQ_NR / num_cpus) * num_cpus - 1;
+}
- INIT_LIST_HEAD(&queue->reorder.list);
- INIT_LIST_HEAD(&queue->parallel.list);
- INIT_LIST_HEAD(&queue->serial.list);
- spin_lock_init(&queue->reorder.lock);
- spin_lock_init(&queue->parallel.lock);
- spin_lock_init(&queue->serial.lock);
+/* Allocate and initialize the internal cpumask dependend resources. */
+static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
+ const struct cpumask *pcpumask,
+ const struct cpumask *cbcpumask)
+{
+ struct parallel_data *pd;
- INIT_WORK(&queue->pwork, padata_parallel_worker);
- INIT_WORK(&queue->swork, padata_serial_worker);
- }
+ pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL);
+ if (!pd)
+ goto err;
- num_cpus = cpumask_weight(pd->cpumask);
- pd->max_seq_nr = (MAX_SEQ_NR / num_cpus) * num_cpus - 1;
+ pd->pqueue = alloc_percpu(struct padata_parallel_queue);
+ if (!pd->pqueue)
+ goto err_free_pd;
+
+ pd->squeue = alloc_percpu(struct padata_serial_queue);
+ if (!pd->squeue)
+ goto err_free_pqueue;
+ if (padata_setup_cpumasks(pd, pcpumask, cbcpumask) < 0)
+ goto err_free_squeue;
+ padata_init_pqueues(pd);
+ padata_init_squeues(pd);
setup_timer(&pd->timer, padata_reorder_timer, (unsigned long)pd);
atomic_set(&pd->seq_nr, -1);
atomic_set(&pd->reorder_objects, 0);
@@ -412,8 +450,10 @@ static struct parallel_data *padata_alloc_pd(struct padata_instance *pinst,
return pd;
-err_free_queue:
- free_percpu(pd->queue);
+err_free_squeue:
+ free_percpu(pd->squeue);
+err_free_pqueue:
+ free_percpu(pd->pqueue);
err_free_pd:
kfree(pd);
err:
@@ -422,8 +462,10 @@ err:
static void padata_free_pd(struct parallel_data *pd)
{
- free_cpumask_var(pd->cpumask);
- free_percpu(pd->queue);
+ free_cpumask_var(pd->cpumask.pcpu);
+ free_cpumask_var(pd->cpumask.cbcpu);
+ free_percpu(pd->pqueue);
+ free_percpu(pd->squeue);
kfree(pd);
}
@@ -431,11 +473,12 @@ static void padata_free_pd(struct parallel_data *pd)
static void padata_flush_queues(struct parallel_data *pd)
{
int cpu;
- struct padata_queue *queue;
+ struct padata_parallel_queue *pqueue;
+ struct padata_serial_queue *squeue;
- for_each_cpu(cpu, pd->cpumask) {
- queue = per_cpu_ptr(pd->queue, cpu);
- flush_work(&queue->pwork);
+ for_each_cpu(cpu, pd->cpumask.pcpu) {
+ pqueue = per_cpu_ptr(pd->pqueue, cpu);
+ flush_work(&pqueue->work);
}
del_timer_sync(&pd->timer);
@@ -443,9 +486,9 @@ static void padata_flush_queues(struct parallel_data *pd)
if (atomic_read(&pd->reorder_objects))
padata_reorder(pd);
- for_each_cpu(cpu, pd->cpumask) {
- queue = per_cpu_ptr(pd->queue, cpu);
- flush_work(&queue->swork);
+ for_each_cpu(cpu, pd->cpumask.cbcpu) {
+ squeue = per_cpu_ptr(pd->squeue, cpu);
+ flush_work(&squeue->work);
}
BUG_ON(atomic_read(&pd->refcnt) != 0);
@@ -475,21 +518,63 @@ static void padata_replace(struct padata_instance *pinst,
struct parallel_data *pd_new)
{
struct parallel_data *pd_old = pinst->pd;
+ int notification_mask = 0;
pinst->flags |= PADATA_RESET;
rcu_assign_pointer(pinst->pd, pd_new);
synchronize_rcu();
+ if (!pd_old)
+ goto out;
- if (pd_old) {
- padata_flush_queues(pd_old);
- padata_free_pd(pd_old);
- }
+ padata_flush_queues(pd_old);
+ if (!cpumask_equal(pd_old->cpumask.pcpu, pd_new->cpumask.pcpu))
+ notification_mask |= PADATA_CPU_PARALLEL;
+ if (!cpumask_equal(pd_old->cpumask.cbcpu, pd_new->cpumask.cbcpu))
+ notification_mask |= PADATA_CPU_SERIAL;
+
+ padata_free_pd(pd_old);
+ if (notification_mask)
+ blocking_notifier_call_chain(&pinst->cpumask_change_notifier,
+ notification_mask, pinst);
+out:
pinst->flags &= ~PADATA_RESET;
}
+/**
+ * padata_register_cpumask_notifier - Registers a notifier that will be called
+ * if either pcpu or cbcpu or both cpumasks change.
+ *
+ * @pinst: A poineter to padata instance
+ * @nblock: A pointer to notifier block.
+ */
+int padata_register_cpumask_notifier(struct padata_instance *pinst,
+ struct notifier_block *nblock)
+{
+ return blocking_notifier_chain_register(&pinst->cpumask_change_notifier,
+ nblock);
+}
+EXPORT_SYMBOL(padata_register_cpumask_notifier);
+
+/**
+ * padata_unregister_cpumask_notifier - Unregisters cpumask notifier
+ * registered earlier using padata_register_cpumask_notifier
+ *
+ * @pinst: A pointer to data instance.
+ * @nlock: A pointer to notifier block.
+ */
+int padata_unregister_cpumask_notifier(struct padata_instance *pinst,
+ struct notifier_block *nblock)
+{
+ return blocking_notifier_chain_unregister(
+ &pinst->cpumask_change_notifier,
+ nblock);
+}
+EXPORT_SYMBOL(padata_unregister_cpumask_notifier);
+
+
/* If cpumask contains no active cpu, we mark the instance as invalid. */
static bool padata_validate_cpumask(struct padata_instance *pinst,
const struct cpumask *cpumask)
@@ -504,13 +589,82 @@ static bool padata_validate_cpumask(struct padata_instance *pinst,
}
/**
- * padata_set_cpumask - set the cpumask that padata should use
+ * padata_get_cpumask: Fetch serial or parallel cpumask from the
+ * given padata instance and copy it to @out_mask
+ *
+ * @pinst: A pointer to padata instance
+ * @cpumask_type: Specifies which cpumask will be copied.
+ * Possible values are PADATA_CPU_SERIAL *or* PADATA_CPU_PARALLEL
+ * corresponding to serial and parallel cpumask respectively.
+ * @out_mask: A pointer to cpumask structure where selected
+ * cpumask will be copied.
+ */
+int padata_get_cpumask(struct padata_instance *pinst,
+ int cpumask_type, struct cpumask *out_mask)
+{
+ struct parallel_data *pd;
+ int ret = 0;
+
+ rcu_read_lock_bh();
+ pd = rcu_dereference(pinst->pd);
+ switch (cpumask_type) {
+ case PADATA_CPU_SERIAL:
+ cpumask_copy(out_mask, pd->cpumask.cbcpu);
+ break;
+ case PADATA_CPU_PARALLEL:
+ cpumask_copy(out_mask, pd->cpumask.pcpu);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ rcu_read_unlock_bh();
+ return ret;
+}
+EXPORT_SYMBOL(padata_get_cpumask);
+
+/**
+ * padata_set_cpumask: Sets specified by @cpumask_type cpumask to the value
+ * equivalent to @cpumask.
*
* @pinst: padata instance
+ * @cpumask_type: PADATA_CPU_SERIAL or PADATA_CPU_PARALLEL corresponding
+ * to parallel and serial cpumasks respectively.
* @cpumask: the cpumask to use
*/
-int padata_set_cpumask(struct padata_instance *pinst,
- cpumask_var_t cpumask)
+int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type,
+ cpumask_var_t cpumask)
+{
+ struct cpumask *serial_mask, *parallel_mask;
+
+ switch (cpumask_type) {
+ case PADATA_CPU_PARALLEL:
+ serial_mask = pinst->cpumask.cbcpu;
+ parallel_mask = cpumask;
+ break;
+ case PADATA_CPU_SERIAL:
+ parallel_mask = pinst->cpumask.pcpu;
+ serial_mask = cpumask;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return __padata_set_cpumasks(pinst, parallel_mask, serial_mask);
+}
+EXPORT_SYMBOL(padata_set_cpumask);
+
+/**
+ * __padata_set_cpumasks - Set both parallel and serial cpumasks. The first
+ * one is used by parallel workers and the second one
+ * by the wokers doing serialization.
+ *
+ * @pinst: padata instance
+ * @pcpumask: the cpumask to use for parallel workers
+ * @cbcpumask: the cpumsak to use for serial workers
+ */
+int __padata_set_cpumasks(struct padata_instance *pinst,
+ cpumask_var_t pcpumask, cpumask_var_t cbcpumask)
{
int valid;
int err = 0;
@@ -518,7 +672,13 @@ int padata_set_cpumask(struct padata_instance *pinst,
mutex_lock(&pinst->lock);
- valid = padata_validate_cpumask(pinst, cpumask);
+ valid = padata_validate_cpumask(pinst, pcpumask);
+ if (!valid) {
+ __padata_stop(pinst);
+ goto out_replace;
+ }
+
+ valid = padata_validate_cpumask(pinst, cbcpumask);
if (!valid) {
__padata_stop(pinst);
goto out_replace;
@@ -526,14 +686,15 @@ int padata_set_cpumask(struct padata_instance *pinst,
get_online_cpus();
- pd = padata_alloc_pd(pinst, cpumask);
+ pd = padata_alloc_pd(pinst, pcpumask, cbcpumask);
if (!pd) {
err = -ENOMEM;
goto out;
}
out_replace:
- cpumask_copy(pinst->cpumask, cpumask);
+ cpumask_copy(pinst->cpumask.pcpu, pcpumask);
+ cpumask_copy(pinst->cpumask.cbcpu, cbcpumask);
padata_replace(pinst, pd);
@@ -546,41 +707,57 @@ out:
mutex_unlock(&pinst->lock);
return err;
+
}
-EXPORT_SYMBOL(padata_set_cpumask);
+EXPORT_SYMBOL(__padata_set_cpumasks);
static int __padata_add_cpu(struct padata_instance *pinst, int cpu)
{
struct parallel_data *pd;
if (cpumask_test_cpu(cpu, cpu_active_mask)) {
- pd = padata_alloc_pd(pinst, pinst->cpumask);
+ pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu,
+ pinst->cpumask.cbcpu);
if (!pd)
return -ENOMEM;
padata_replace(pinst, pd);
- if (padata_validate_cpumask(pinst, pinst->cpumask))
+ if (padata_validate_cpumask(pinst, pinst->cpumask.pcpu) &&
+ padata_validate_cpumask(pinst, pinst->cpumask.cbcpu))
__padata_start(pinst);
}
return 0;
}
-/**
- * padata_add_cpu - add a cpu to the padata cpumask
+ /**
+ * padata_add_cpu - add a cpu to one or both(parallel and serial)
+ * padata cpumasks.
*
* @pinst: padata instance
* @cpu: cpu to add
+ * @mask: bitmask of flags specifying to which cpumask @cpu shuld be added.
+ * The @mask may be any combination of the following flags:
+ * PADATA_CPU_SERIAL - serial cpumask
+ * PADATA_CPU_PARALLEL - parallel cpumask
*/
-int padata_add_cpu(struct padata_instance *pinst, int cpu)
+
+int padata_add_cpu(struct padata_instance *pinst, int cpu, int mask)
{
int err;
+ if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL)))
+ return -EINVAL;
+
mutex_lock(&pinst->lock);
get_online_cpus();
- cpumask_set_cpu(cpu, pinst->cpumask);
+ if (mask & PADATA_CPU_SERIAL)
+ cpumask_set_cpu(cpu, pinst->cpumask.cbcpu);
+ if (mask & PADATA_CPU_PARALLEL)
+ cpumask_set_cpu(cpu, pinst->cpumask.pcpu);
+
err = __padata_add_cpu(pinst, cpu);
put_online_cpus();
@@ -596,13 +773,15 @@ static int __padata_remove_cpu(struct padata_instance *pinst, int cpu)
if (cpumask_test_cpu(cpu, cpu_online_mask)) {
- if (!padata_validate_cpumask(pinst, pinst->cpumask)) {
+ if (!padata_validate_cpumask(pinst, pinst->cpumask.pcpu) ||
+ !padata_validate_cpumask(pinst, pinst->cpumask.cbcpu)) {
__padata_stop(pinst);
padata_replace(pinst, pd);
goto out;
}
- pd = padata_alloc_pd(pinst, pinst->cpumask);
+ pd = padata_alloc_pd(pinst, pinst->cpumask.pcpu,
+ pinst->cpumask.cbcpu);
if (!pd)
return -ENOMEM;
@@ -613,20 +792,32 @@ out:
return 0;
}
-/**
- * padata_remove_cpu - remove a cpu from the padata cpumask
+ /**
+ * padata_remove_cpu - remove a cpu from the one or both(serial and paralell)
+ * padata cpumasks.
*
* @pinst: padata instance
* @cpu: cpu to remove
+ * @mask: bitmask specifying from which cpumask @cpu should be removed
+ * The @mask may be any combination of the following flags:
+ * PADATA_CPU_SERIAL - serial cpumask
+ * PADATA_CPU_PARALLEL - parallel cpumask
*/
-int padata_remove_cpu(struct padata_instance *pinst, int cpu)
+int padata_remove_cpu(struct padata_instance *pinst, int cpu, int mask)
{
int err;
+ if (!(mask & (PADATA_CPU_SERIAL | PADATA_CPU_PARALLEL)))
+ return -EINVAL;
+
mutex_lock(&pinst->lock);
get_online_cpus();
- cpumask_clear_cpu(cpu, pinst->cpumask);
+ if (mask & PADATA_CPU_SERIAL)
+ cpumask_clear_cpu(cpu, pinst->cpumask.cbcpu);
+ if (mask & PADATA_CPU_PARALLEL)
+ cpumask_clear_cpu(cpu, pinst->cpumask.pcpu);
+
err = __padata_remove_cpu(pinst, cpu);
put_online_cpus();
@@ -672,6 +863,14 @@ void padata_stop(struct padata_instance *pinst)
EXPORT_SYMBOL(padata_stop);
#ifdef CONFIG_HOTPLUG_CPU
+
+static inline int pinst_has_cpu(struct padata_instance *pinst, int cpu)
+{
+ return cpumask_test_cpu(cpu, pinst->cpumask.pcpu) ||
+ cpumask_test_cpu(cpu, pinst->cpumask.cbcpu);
+}
+
+
static int padata_cpu_callback(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
@@ -684,7 +883,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
switch (action) {
case CPU_ONLINE:
case CPU_ONLINE_FROZEN:
- if (!cpumask_test_cpu(cpu, pinst->cpumask))
+ if (!pinst_has_cpu(pinst, cpu))
break;
mutex_lock(&pinst->lock);
err = __padata_add_cpu(pinst, cpu);
@@ -695,7 +894,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
case CPU_DOWN_PREPARE:
case CPU_DOWN_PREPARE_FROZEN:
- if (!cpumask_test_cpu(cpu, pinst->cpumask))
+ if (!pinst_has_cpu(pinst, cpu))
break;
mutex_lock(&pinst->lock);
err = __padata_remove_cpu(pinst, cpu);
@@ -706,7 +905,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
- if (!cpumask_test_cpu(cpu, pinst->cpumask))
+ if (!pinst_has_cpu(pinst, cpu))
break;
mutex_lock(&pinst->lock);
__padata_remove_cpu(pinst, cpu);
@@ -714,7 +913,7 @@ static int padata_cpu_callback(struct notifier_block *nfb,
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN:
- if (!cpumask_test_cpu(cpu, pinst->cpumask))
+ if (!pinst_has_cpu(pinst, cpu))
break;
mutex_lock(&pinst->lock);
__padata_add_cpu(pinst, cpu);
@@ -726,13 +925,29 @@ static int padata_cpu_callback(struct notifier_block *nfb,
#endif
/**
- * padata_alloc - allocate and initialize a padata instance
+ * padata_alloc - Allocate and initialize padata instance.
+ * Use default cpumask(cpu_possible_mask)
+ * for serial and parallel workes.
+ *
+ * @wq: workqueue to use for the allocated padata instance
+ */
+struct padata_instance *padata_alloc(struct workqueue_struct *wq)
+{
+ return __padata_alloc(wq, cpu_possible_mask, cpu_possible_mask);
+}
+EXPORT_SYMBOL(padata_alloc);
+
+/**
+ * __padata_alloc - allocate and initialize a padata instance
+ * and specify cpumasks for serial and parallel workers.
*
- * @cpumask: cpumask that padata uses for parallelization
* @wq: workqueue to use for the allocated padata instance
+ * @pcpumask: cpumask that will be used for padata parallelization
+ * @cbcpumask: cpumask that will be used for padata serialization
*/
-struct padata_instance *padata_alloc(const struct cpumask *cpumask,
- struct workqueue_struct *wq)
+struct padata_instance *__padata_alloc(struct workqueue_struct *wq,
+ const struct cpumask *pcpumask,
+ const struct cpumask *cbcpumask)
{
struct padata_instance *pinst;
struct parallel_data *pd = NULL;
@@ -742,21 +957,26 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
goto err;
get_online_cpus();
-
- if (!alloc_cpumask_var(&pinst->cpumask, GFP_KERNEL))
+ if (!alloc_cpumask_var(&pinst->cpumask.pcpu, GFP_KERNEL))
+ goto err_free_inst;
+ if (!alloc_cpumask_var(&pinst->cpumask.cbcpu, GFP_KERNEL)) {
+ free_cpumask_var(pinst->cpumask.pcpu);
goto err_free_inst;
-
- if (padata_validate_cpumask(pinst, cpumask)) {
- pd = padata_alloc_pd(pinst, cpumask);
- if (!pd)
- goto err_free_mask;
}
+ if (!padata_validate_cpumask(pinst, pcpumask) ||
+ !padata_validate_cpumask(pinst, cbcpumask))
+ goto err_free_masks;
+
+ pd = padata_alloc_pd(pinst, pcpumask, cbcpumask);
+ if (!pd)
+ goto err_free_masks;
rcu_assign_pointer(pinst->pd, pd);
pinst->wq = wq;
- cpumask_copy(pinst->cpumask, cpumask);
+ cpumask_copy(pinst->cpumask.pcpu, pcpumask);
+ cpumask_copy(pinst->cpumask.cbcpu, cbcpumask);
pinst->flags = 0;
@@ -768,19 +988,21 @@ struct padata_instance *padata_alloc(const struct cpumask *cpumask,
put_online_cpus();
+ BLOCKING_INIT_NOTIFIER_HEAD(&pinst->cpumask_change_notifier);
mutex_init(&pinst->lock);
return pinst;
-err_free_mask:
- free_cpumask_var(pinst->cpumask);
+err_free_masks:
+ free_cpumask_var(pinst->cpumask.pcpu);
+ free_cpumask_var(pinst->cpumask.cbcpu);
err_free_inst:
kfree(pinst);
put_online_cpus();
err:
return NULL;
}
-EXPORT_SYMBOL(padata_alloc);
+EXPORT_SYMBOL(__padata_alloc);
/**
* padata_free - free a padata instance
@@ -795,7 +1017,8 @@ void padata_free(struct padata_instance *pinst)
padata_stop(pinst);
padata_free_pd(pinst->pd);
- free_cpumask_var(pinst->cpumask);
+ free_cpumask_var(pinst->cpumask.pcpu);
+ free_cpumask_var(pinst->cpumask.cbcpu);
kfree(pinst);
}
EXPORT_SYMBOL(padata_free);