From bd25b4886ddcebec92591f298ce2ce345d7f2ea9 Mon Sep 17 00:00:00 2001 From: Daniel Jordan Date: Tue, 14 Jul 2020 16:13:51 -0400 Subject: padata: remove start function padata_start() is only used right after pcrypt allocates an instance with all possible CPUs, when PADATA_INVALID can't happen, so there's no need for a separate "start" step. It can be done during allocation to save text, make using padata easier, and avoid unneeded calls in the future. Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu --- include/linux/padata.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux/padata.h') diff --git a/include/linux/padata.h b/include/linux/padata.h index 7302efff5e65..20294cddc739 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -204,6 +204,5 @@ extern void padata_do_serial(struct padata_priv *padata); extern void __init padata_do_multithreaded(struct padata_mt_job *job); extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, cpumask_var_t cpumask); -extern int padata_start(struct padata_instance *pinst); extern void padata_stop(struct padata_instance *pinst); #endif -- cgit v1.2.3 From 350ef051d4edd884e8dea0be9f3685b4b32142fb Mon Sep 17 00:00:00 2001 From: Daniel Jordan Date: Tue, 14 Jul 2020 16:13:52 -0400 Subject: padata: remove stop function padata_stop() has two callers and is unnecessary in both cases. When pcrypt calls it before padata_free(), it's being unloaded so there are no outstanding padata jobs[0]. When __padata_free() calls it, it's either along the same path or else pcrypt initialization failed, which of course means there are also no outstanding jobs. Removing it simplifies padata and saves text. [0] https://lore.kernel.org/linux-crypto/20191119225017.mjrak2fwa5vccazl@gondor.apana.org.au/ Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu --- Documentation/core-api/padata.rst | 16 ++-------------- crypto/pcrypt.c | 12 +++--------- include/linux/padata.h | 1 - kernel/padata.c | 14 -------------- 4 files changed, 5 insertions(+), 38 deletions(-) (limited to 'include/linux/padata.h') diff --git a/Documentation/core-api/padata.rst b/Documentation/core-api/padata.rst index 0830e5b0e821..771d50330e5b 100644 --- a/Documentation/core-api/padata.rst +++ b/Documentation/core-api/padata.rst @@ -31,18 +31,7 @@ padata_instance structure for overall control of how jobs are to be run:: 'name' simply identifies the instance. -There are functions for enabling and disabling the instance:: - - int padata_start(struct padata_instance *pinst); - void padata_stop(struct padata_instance *pinst); - -These functions are setting or clearing the "PADATA_INIT" flag; if that flag is -not set, other functions will refuse to work. padata_start() returns zero on -success (flag set) or -EINVAL if the padata cpumask contains no active CPU -(flag not set). padata_stop() clears the flag and blocks until the padata -instance is unused. - -Finally, complete padata initialization by allocating a padata_shell:: +Then, complete padata initialization by allocating a padata_shell:: struct padata_shell *padata_alloc_shell(struct padata_instance *pinst); @@ -155,11 +144,10 @@ submitted. Destroying ---------- -Cleaning up a padata instance predictably involves calling the three free +Cleaning up a padata instance predictably involves calling the two free functions that correspond to the allocation in reverse:: void padata_free_shell(struct padata_shell *ps); - void padata_stop(struct padata_instance *pinst); void padata_free(struct padata_instance *pinst); It is the user's responsibility to ensure all outstanding jobs are complete diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c index fb9127ec5357..2d4ac9d44902 100644 --- a/crypto/pcrypt.c +++ b/crypto/pcrypt.c @@ -327,12 +327,6 @@ static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) return ret; } -static void pcrypt_fini_padata(struct padata_instance *pinst) -{ - padata_stop(pinst); - padata_free(pinst); -} - static struct crypto_template pcrypt_tmpl = { .name = "pcrypt", .create = pcrypt_create, @@ -358,7 +352,7 @@ static int __init pcrypt_init(void) return crypto_register_template(&pcrypt_tmpl); err_deinit_pencrypt: - pcrypt_fini_padata(pencrypt); + padata_free(pencrypt); err_unreg_kset: kset_unregister(pcrypt_kset); err: @@ -369,8 +363,8 @@ static void __exit pcrypt_exit(void) { crypto_unregister_template(&pcrypt_tmpl); - pcrypt_fini_padata(pencrypt); - pcrypt_fini_padata(pdecrypt); + padata_free(pencrypt); + padata_free(pdecrypt); kset_unregister(pcrypt_kset); } diff --git a/include/linux/padata.h b/include/linux/padata.h index 20294cddc739..7d53208b43da 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -204,5 +204,4 @@ extern void padata_do_serial(struct padata_priv *padata); extern void __init padata_do_multithreaded(struct padata_mt_job *job); extern int padata_set_cpumask(struct padata_instance *pinst, int cpumask_type, cpumask_var_t cpumask); -extern void padata_stop(struct padata_instance *pinst); #endif diff --git a/kernel/padata.c b/kernel/padata.c index 931762316612..8f55e717ba50 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -789,19 +789,6 @@ out: } EXPORT_SYMBOL(padata_set_cpumask); -/** - * padata_stop - stop the parallel processing - * - * @pinst: padata instance to stop - */ -void padata_stop(struct padata_instance *pinst) -{ - mutex_lock(&pinst->lock); - __padata_stop(pinst); - mutex_unlock(&pinst->lock); -} -EXPORT_SYMBOL(padata_stop); - #ifdef CONFIG_HOTPLUG_CPU static int __padata_add_cpu(struct padata_instance *pinst, int cpu) @@ -883,7 +870,6 @@ static void __padata_free(struct padata_instance *pinst) WARN_ON(!list_empty(&pinst->pslist)); - padata_stop(pinst); free_cpumask_var(pinst->rcpumask.cbcpu); free_cpumask_var(pinst->rcpumask.pcpu); free_cpumask_var(pinst->cpumask.pcpu); -- cgit v1.2.3 From d69e037bcc4a7e31fdd40ae416aa1bd768dd7d99 Mon Sep 17 00:00:00 2001 From: Daniel Jordan Date: Tue, 14 Jul 2020 16:13:54 -0400 Subject: padata: remove effective cpumasks from the instance A padata instance has effective cpumasks that store the user-supplied masks ANDed with the online mask, but this middleman is unnecessary. parallel_data keeps the same information around. Removing this saves text and code churn in future changes. Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu --- include/linux/padata.h | 2 -- kernel/padata.c | 30 +++--------------------------- 2 files changed, 3 insertions(+), 29 deletions(-) (limited to 'include/linux/padata.h') diff --git a/include/linux/padata.h b/include/linux/padata.h index 7d53208b43da..a941b96b7119 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -167,7 +167,6 @@ struct padata_mt_job { * @serial_wq: The workqueue used for serial work. * @pslist: List of padata_shell objects attached to this instance. * @cpumask: User supplied cpumasks for parallel and serial works. - * @rcpumask: Actual cpumasks based on user cpumask and cpu_online_mask. * @kobj: padata instance kernel object. * @lock: padata instance lock. * @flags: padata flags. @@ -179,7 +178,6 @@ struct padata_instance { struct workqueue_struct *serial_wq; struct list_head pslist; struct padata_cpumask cpumask; - struct padata_cpumask rcpumask; struct kobject kobj; struct mutex lock; u8 flags; diff --git a/kernel/padata.c b/kernel/padata.c index 27f90a3c4dc6..4f0a57e5738c 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -571,13 +571,8 @@ static void padata_init_pqueues(struct parallel_data *pd) static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) { struct padata_instance *pinst = ps->pinst; - const struct cpumask *cbcpumask; - const struct cpumask *pcpumask; struct parallel_data *pd; - cbcpumask = pinst->rcpumask.cbcpu; - pcpumask = pinst->rcpumask.pcpu; - pd = kzalloc(sizeof(struct parallel_data), GFP_KERNEL); if (!pd) goto err; @@ -597,8 +592,8 @@ static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) if (!alloc_cpumask_var(&pd->cpumask.cbcpu, GFP_KERNEL)) goto err_free_pcpu; - cpumask_copy(pd->cpumask.pcpu, pcpumask); - cpumask_copy(pd->cpumask.cbcpu, cbcpumask); + cpumask_and(pd->cpumask.pcpu, pinst->cpumask.pcpu, cpu_online_mask); + cpumask_and(pd->cpumask.cbcpu, pinst->cpumask.cbcpu, cpu_online_mask); padata_init_pqueues(pd); padata_init_squeues(pd); @@ -668,12 +663,6 @@ static int padata_replace(struct padata_instance *pinst) pinst->flags |= PADATA_RESET; - cpumask_and(pinst->rcpumask.pcpu, pinst->cpumask.pcpu, - cpu_online_mask); - - cpumask_and(pinst->rcpumask.cbcpu, pinst->cpumask.cbcpu, - cpu_online_mask); - list_for_each_entry(ps, &pinst->pslist, list) { err = padata_replace_one(ps); if (err) @@ -856,8 +845,6 @@ static void __padata_free(struct padata_instance *pinst) WARN_ON(!list_empty(&pinst->pslist)); - free_cpumask_var(pinst->rcpumask.cbcpu); - free_cpumask_var(pinst->rcpumask.pcpu); free_cpumask_var(pinst->cpumask.pcpu); free_cpumask_var(pinst->cpumask.cbcpu); destroy_workqueue(pinst->serial_wq); @@ -1033,20 +1020,13 @@ static struct padata_instance *padata_alloc(const char *name, !padata_validate_cpumask(pinst, cbcpumask)) goto err_free_masks; - if (!alloc_cpumask_var(&pinst->rcpumask.pcpu, GFP_KERNEL)) - goto err_free_masks; - if (!alloc_cpumask_var(&pinst->rcpumask.cbcpu, GFP_KERNEL)) - goto err_free_rcpumask_pcpu; - INIT_LIST_HEAD(&pinst->pslist); cpumask_copy(pinst->cpumask.pcpu, pcpumask); cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); - cpumask_and(pinst->rcpumask.pcpu, pcpumask, cpu_online_mask); - cpumask_and(pinst->rcpumask.cbcpu, cbcpumask, cpu_online_mask); if (padata_setup_cpumasks(pinst)) - goto err_free_rcpumask_cbcpu; + goto err_free_masks; __padata_start(pinst); @@ -1064,10 +1044,6 @@ static struct padata_instance *padata_alloc(const char *name, return pinst; -err_free_rcpumask_cbcpu: - free_cpumask_var(pinst->rcpumask.cbcpu); -err_free_rcpumask_pcpu: - free_cpumask_var(pinst->rcpumask.pcpu); err_free_masks: free_cpumask_var(pinst->cpumask.pcpu); free_cpumask_var(pinst->cpumask.cbcpu); -- cgit v1.2.3 From 3f257191d31d5eaf154ebdb696efc238837ddd51 Mon Sep 17 00:00:00 2001 From: Daniel Jordan Date: Tue, 14 Jul 2020 16:13:55 -0400 Subject: padata: fold padata_alloc_possible() into padata_alloc() There's no reason to have two interfaces when there's only one caller. Removing _possible saves text and simplifies future changes. Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu --- Documentation/core-api/padata.rst | 2 +- crypto/pcrypt.c | 2 +- include/linux/padata.h | 2 +- kernel/padata.c | 33 +++++---------------------------- 4 files changed, 8 insertions(+), 31 deletions(-) (limited to 'include/linux/padata.h') diff --git a/Documentation/core-api/padata.rst b/Documentation/core-api/padata.rst index 771d50330e5b..35175710b43c 100644 --- a/Documentation/core-api/padata.rst +++ b/Documentation/core-api/padata.rst @@ -27,7 +27,7 @@ padata_instance structure for overall control of how jobs are to be run:: #include - struct padata_instance *padata_alloc_possible(const char *name); + struct padata_instance *padata_alloc(const char *name); 'name' simply identifies the instance. diff --git a/crypto/pcrypt.c b/crypto/pcrypt.c index 2d4ac9d44902..d569c7ed6c80 100644 --- a/crypto/pcrypt.c +++ b/crypto/pcrypt.c @@ -316,7 +316,7 @@ static int pcrypt_init_padata(struct padata_instance **pinst, const char *name) { int ret = -ENOMEM; - *pinst = padata_alloc_possible(name); + *pinst = padata_alloc(name); if (!*pinst) return ret; diff --git a/include/linux/padata.h b/include/linux/padata.h index a941b96b7119..070a7d43e8af 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -192,7 +192,7 @@ extern void __init padata_init(void); static inline void __init padata_init(void) {} #endif -extern struct padata_instance *padata_alloc_possible(const char *name); +extern struct padata_instance *padata_alloc(const char *name); extern void padata_free(struct padata_instance *pinst); extern struct padata_shell *padata_alloc_shell(struct padata_instance *pinst); extern void padata_free_shell(struct padata_shell *ps); diff --git a/kernel/padata.c b/kernel/padata.c index 4f0a57e5738c..1c0b97891edb 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -979,18 +979,12 @@ static struct kobj_type padata_attr_type = { }; /** - * padata_alloc - allocate and initialize a padata instance and specify - * cpumasks for serial and parallel workers. - * + * padata_alloc - allocate and initialize a padata instance * @name: used to identify the instance - * @pcpumask: cpumask that will be used for padata parallelization - * @cbcpumask: cpumask that will be used for padata serialization * * Return: new instance on success, NULL on error */ -static struct padata_instance *padata_alloc(const char *name, - const struct cpumask *pcpumask, - const struct cpumask *cbcpumask) +struct padata_instance *padata_alloc(const char *name) { struct padata_instance *pinst; @@ -1016,14 +1010,11 @@ static struct padata_instance *padata_alloc(const char *name, free_cpumask_var(pinst->cpumask.pcpu); goto err_free_serial_wq; } - if (!padata_validate_cpumask(pinst, pcpumask) || - !padata_validate_cpumask(pinst, cbcpumask)) - goto err_free_masks; INIT_LIST_HEAD(&pinst->pslist); - cpumask_copy(pinst->cpumask.pcpu, pcpumask); - cpumask_copy(pinst->cpumask.cbcpu, cbcpumask); + cpumask_copy(pinst->cpumask.pcpu, cpu_possible_mask); + cpumask_copy(pinst->cpumask.cbcpu, cpu_possible_mask); if (padata_setup_cpumasks(pinst)) goto err_free_masks; @@ -1057,21 +1048,7 @@ err_free_inst: err: return NULL; } - -/** - * padata_alloc_possible - Allocate and initialize padata instance. - * Use the cpu_possible_mask for serial and - * parallel workers. - * - * @name: used to identify the instance - * - * Return: new instance on success, NULL on error - */ -struct padata_instance *padata_alloc_possible(const char *name) -{ - return padata_alloc(name, cpu_possible_mask, cpu_possible_mask); -} -EXPORT_SYMBOL(padata_alloc_possible); +EXPORT_SYMBOL(padata_alloc); /** * padata_free - free a padata instance -- cgit v1.2.3 From f601c725a6ac072608f47083e7c8115a3f504f95 Mon Sep 17 00:00:00 2001 From: Daniel Jordan Date: Tue, 14 Jul 2020 16:13:56 -0400 Subject: padata: remove padata_parallel_queue Only its reorder field is actually used now, so remove the struct and embed @reorder directly in parallel_data. No functional change, just a cleanup. Signed-off-by: Daniel Jordan Cc: Herbert Xu Cc: Steffen Klassert Cc: linux-crypto@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Herbert Xu --- include/linux/padata.h | 15 ++------------- kernel/padata.c | 46 ++++++++++++++++++++-------------------------- 2 files changed, 22 insertions(+), 39 deletions(-) (limited to 'include/linux/padata.h') diff --git a/include/linux/padata.h b/include/linux/padata.h index 070a7d43e8af..a433f13fc4bf 100644 --- a/include/linux/padata.h +++ b/include/linux/padata.h @@ -66,17 +66,6 @@ struct padata_serial_queue { struct parallel_data *pd; }; -/** - * struct padata_parallel_queue - The percpu padata parallel queue - * - * @reorder: List to wait for reordering after parallel processing. - * @num_obj: Number of objects that are processed by this cpu. - */ -struct padata_parallel_queue { - struct padata_list reorder; - atomic_t num_obj; -}; - /** * struct padata_cpumask - The cpumasks for the parallel/serial workers * @@ -93,7 +82,7 @@ struct padata_cpumask { * that depends on the cpumask in use. * * @ps: padata_shell object. - * @pqueue: percpu padata queues used for parallelization. + * @reorder_list: percpu reorder lists * @squeue: percpu padata queues used for serialuzation. * @refcnt: Number of objects holding a reference on this parallel_data. * @seq_nr: Sequence number of the parallelized data object. @@ -105,7 +94,7 @@ struct padata_cpumask { */ struct parallel_data { struct padata_shell *ps; - struct padata_parallel_queue __percpu *pqueue; + struct padata_list __percpu *reorder_list; struct padata_serial_queue __percpu *squeue; atomic_t refcnt; unsigned int seq_nr; diff --git a/kernel/padata.c b/kernel/padata.c index 1c0b97891edb..16cb894dc272 100644 --- a/kernel/padata.c +++ b/kernel/padata.c @@ -250,13 +250,11 @@ EXPORT_SYMBOL(padata_do_parallel); static struct padata_priv *padata_find_next(struct parallel_data *pd, bool remove_object) { - struct padata_parallel_queue *next_queue; struct padata_priv *padata; struct padata_list *reorder; int cpu = pd->cpu; - next_queue = per_cpu_ptr(pd->pqueue, cpu); - reorder = &next_queue->reorder; + reorder = per_cpu_ptr(pd->reorder_list, cpu); spin_lock(&reorder->lock); if (list_empty(&reorder->list)) { @@ -291,7 +289,7 @@ static void padata_reorder(struct parallel_data *pd) int cb_cpu; struct padata_priv *padata; struct padata_serial_queue *squeue; - struct padata_parallel_queue *next_queue; + struct padata_list *reorder; /* * We need to ensure that only one cpu can work on dequeueing of @@ -339,9 +337,8 @@ static void padata_reorder(struct parallel_data *pd) */ smp_mb(); - next_queue = per_cpu_ptr(pd->pqueue, pd->cpu); - if (!list_empty(&next_queue->reorder.list) && - padata_find_next(pd, false)) + reorder = per_cpu_ptr(pd->reorder_list, pd->cpu); + if (!list_empty(&reorder->list) && padata_find_next(pd, false)) queue_work(pinst->serial_wq, &pd->reorder_work); } @@ -401,17 +398,16 @@ void padata_do_serial(struct padata_priv *padata) { struct parallel_data *pd = padata->pd; int hashed_cpu = padata_cpu_hash(pd, padata->seq_nr); - struct padata_parallel_queue *pqueue = per_cpu_ptr(pd->pqueue, - hashed_cpu); + struct padata_list *reorder = per_cpu_ptr(pd->reorder_list, hashed_cpu); struct padata_priv *cur; - spin_lock(&pqueue->reorder.lock); + spin_lock(&reorder->lock); /* Sort in ascending order of sequence number. */ - list_for_each_entry_reverse(cur, &pqueue->reorder.list, list) + list_for_each_entry_reverse(cur, &reorder->list, list) if (cur->seq_nr < padata->seq_nr) break; list_add(&padata->list, &cur->list); - spin_unlock(&pqueue->reorder.lock); + spin_unlock(&reorder->lock); /* * Ensure the addition to the reorder list is ordered correctly @@ -553,17 +549,15 @@ static void padata_init_squeues(struct parallel_data *pd) } } -/* Initialize all percpu queues used by parallel workers */ -static void padata_init_pqueues(struct parallel_data *pd) +/* Initialize per-CPU reorder lists */ +static void padata_init_reorder_list(struct parallel_data *pd) { int cpu; - struct padata_parallel_queue *pqueue; + struct padata_list *list; for_each_cpu(cpu, pd->cpumask.pcpu) { - pqueue = per_cpu_ptr(pd->pqueue, cpu); - - __padata_list_init(&pqueue->reorder); - atomic_set(&pqueue->num_obj, 0); + list = per_cpu_ptr(pd->reorder_list, cpu); + __padata_list_init(list); } } @@ -577,13 +571,13 @@ static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) if (!pd) goto err; - pd->pqueue = alloc_percpu(struct padata_parallel_queue); - if (!pd->pqueue) + pd->reorder_list = alloc_percpu(struct padata_list); + if (!pd->reorder_list) goto err_free_pd; pd->squeue = alloc_percpu(struct padata_serial_queue); if (!pd->squeue) - goto err_free_pqueue; + goto err_free_reorder_list; pd->ps = ps; @@ -595,7 +589,7 @@ static struct parallel_data *padata_alloc_pd(struct padata_shell *ps) cpumask_and(pd->cpumask.pcpu, pinst->cpumask.pcpu, cpu_online_mask); cpumask_and(pd->cpumask.cbcpu, pinst->cpumask.cbcpu, cpu_online_mask); - padata_init_pqueues(pd); + padata_init_reorder_list(pd); padata_init_squeues(pd); pd->seq_nr = -1; atomic_set(&pd->refcnt, 1); @@ -609,8 +603,8 @@ err_free_pcpu: free_cpumask_var(pd->cpumask.pcpu); err_free_squeue: free_percpu(pd->squeue); -err_free_pqueue: - free_percpu(pd->pqueue); +err_free_reorder_list: + free_percpu(pd->reorder_list); err_free_pd: kfree(pd); err: @@ -621,7 +615,7 @@ static void padata_free_pd(struct parallel_data *pd) { free_cpumask_var(pd->cpumask.pcpu); free_cpumask_var(pd->cpumask.cbcpu); - free_percpu(pd->pqueue); + free_percpu(pd->reorder_list); free_percpu(pd->squeue); kfree(pd); } -- cgit v1.2.3