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crypto: pcrypt - remove padata cpumask notifier

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Now that padata_do_parallel takes care of finding an alternate callback
CPU, there's no need for pcrypt's callback cpumask, so remove it and the
notifier callback that keeps it in sync.

Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: linux-crypto@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Daniel Jordan 2019-09-05 21:40:25 -04:00 committed by Herbert Xu
parent e6ce0e0807
commit 63d3578892
1 changed files with 18 additions and 107 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

125
crypto/pcrypt.c
View file

@ -18,33 +18,8 @@
#include <linux/cpu.h> #include <linux/cpu.h>
#include <crypto/pcrypt.h> #include <crypto/pcrypt.h>
struct padata_pcrypt { static struct padata_instance *pencrypt;
struct padata_instance *pinst; static struct padata_instance *pdecrypt;
/*
* 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 padata_pcrypt pencrypt;
static struct padata_pcrypt pdecrypt;
static struct kset *pcrypt_kset; static struct kset *pcrypt_kset;
struct pcrypt_instance_ctx { struct pcrypt_instance_ctx {
@ -128,7 +103,7 @@ static int pcrypt_aead_encrypt(struct aead_request *req)
req->cryptlen, req->iv); req->cryptlen, req->iv);
aead_request_set_ad(creq, req->assoclen); aead_request_set_ad(creq, req->assoclen);
err = padata_do_parallel(pencrypt.pinst, padata, &ctx->cb_cpu); err = padata_do_parallel(pencrypt, padata, &ctx->cb_cpu);
if (!err) if (!err)
return -EINPROGRESS; return -EINPROGRESS;
@ -170,7 +145,7 @@ static int pcrypt_aead_decrypt(struct aead_request *req)
req->cryptlen, req->iv); req->cryptlen, req->iv);
aead_request_set_ad(creq, req->assoclen); aead_request_set_ad(creq, req->assoclen);
err = padata_do_parallel(pdecrypt.pinst, padata, &ctx->cb_cpu); err = padata_do_parallel(pdecrypt, padata, &ctx->cb_cpu);
if (!err) if (!err)
return -EINPROGRESS; return -EINPROGRESS;
@ -317,36 +292,6 @@ static int pcrypt_create(struct crypto_template *tmpl, struct rtattr **tb)
return -EINVAL; return -EINVAL;
} }
static int pcrypt_cpumask_change_notify(struct notifier_block *self,
unsigned long val, void *data)
{
struct padata_pcrypt *pcrypt;
struct pcrypt_cpumask *new_mask, *old_mask;
struct padata_cpumask *cpumask = (struct padata_cpumask *)data;
if (!(val & PADATA_CPU_SERIAL))
return 0;
pcrypt = container_of(self, struct padata_pcrypt, 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;
cpumask_copy(new_mask->mask, cpumask->cbcpu);
rcu_assign_pointer(pcrypt->cb_cpumask, new_mask);
synchronize_rcu();
free_cpumask_var(old_mask->mask);
kfree(old_mask);
return 0;
}
static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name) static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
{ {
int ret; int ret;
@ -359,63 +304,29 @@ static int pcrypt_sysfs_add(struct padata_instance *pinst, const char *name)
return ret; return ret;
} }
static int pcrypt_init_padata(struct padata_pcrypt *pcrypt, static int pcrypt_init_padata(struct padata_instance **pinst, const char *name)
const char *name)
{ {
int ret = -ENOMEM; int ret = -ENOMEM;
struct pcrypt_cpumask *mask;
get_online_cpus(); get_online_cpus();
pcrypt->pinst = padata_alloc_possible(name); *pinst = padata_alloc_possible(name);
if (!pcrypt->pinst) if (!*pinst)
goto err; return ret;
mask = kmalloc(sizeof(*mask), GFP_KERNEL); ret = pcrypt_sysfs_add(*pinst, name);
if (!mask)
goto err_free_padata;
if (!alloc_cpumask_var(&mask->mask, GFP_KERNEL)) {
kfree(mask);
goto err_free_padata;
}
cpumask_and(mask->mask, cpu_possible_mask, cpu_online_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) if (ret)
goto err_free_cpumask; padata_free(*pinst);
ret = pcrypt_sysfs_add(pcrypt->pinst, name);
if (ret)
goto err_unregister_notifier;
put_online_cpus();
return ret;
err_unregister_notifier:
padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
err_free_cpumask:
free_cpumask_var(mask->mask);
kfree(mask);
err_free_padata:
padata_free(pcrypt->pinst);
err:
put_online_cpus(); put_online_cpus();
return ret; return ret;
} }
static void pcrypt_fini_padata(struct padata_pcrypt *pcrypt) static void pcrypt_fini_padata(struct padata_instance *pinst)
{ {
free_cpumask_var(pcrypt->cb_cpumask->mask); padata_stop(pinst);
kfree(pcrypt->cb_cpumask); padata_free(pinst);
padata_stop(pcrypt->pinst);
padata_unregister_cpumask_notifier(pcrypt->pinst, &pcrypt->nblock);
padata_free(pcrypt->pinst);
} }
static struct crypto_template pcrypt_tmpl = { static struct crypto_template pcrypt_tmpl = {
@ -440,13 +351,13 @@ static int __init pcrypt_init(void)
if (err) if (err)
goto err_deinit_pencrypt; goto err_deinit_pencrypt;
padata_start(pencrypt.pinst); padata_start(pencrypt);
padata_start(pdecrypt.pinst); padata_start(pdecrypt);
return crypto_register_template(&pcrypt_tmpl); return crypto_register_template(&pcrypt_tmpl);
err_deinit_pencrypt: err_deinit_pencrypt:
pcrypt_fini_padata(&pencrypt); pcrypt_fini_padata(pencrypt);
err_unreg_kset: err_unreg_kset:
kset_unregister(pcrypt_kset); kset_unregister(pcrypt_kset);
err: err:
@ -455,8 +366,8 @@ static int __init pcrypt_init(void)
static void __exit pcrypt_exit(void) static void __exit pcrypt_exit(void)
{ {
pcrypt_fini_padata(&pencrypt); pcrypt_fini_padata(pencrypt);
pcrypt_fini_padata(&pdecrypt); pcrypt_fini_padata(pdecrypt);
kset_unregister(pcrypt_kset); kset_unregister(pcrypt_kset);
crypto_unregister_template(&pcrypt_tmpl); crypto_unregister_template(&pcrypt_tmpl);