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-rw-r--r--crypto/pcrypt.c191
1 files changed, 137 insertions, 54 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);
}