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crypto: caam/qi - simplify CGR allocation, freeing

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CGRs (Congestion Groups) have to be freed by the same CPU that
initialized them.
This is why currently the driver takes special measures; however, using
set_cpus_allowed_ptr() is incorrect - as reported by Sebastian.

Instead of the generic solution of replacing set_cpus_allowed_ptr() with
work_on_cpu_safe(), we use the qman_delete_cgr_safe() QBMan API instead
of qman_delete_cgr() - which internally takes care of proper CGR
deletion.

Link: https://lkml.kernel.org/r/20181005125443.dfhd2asqktm22ney@linutronix.de
Reported-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Horia Geantă 2018-10-08 14:09:37 +03:00 committed by Herbert Xu
parent 58c8a86355
commit 29e83c7570
2 changed files with 5 additions and 40 deletions
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43
drivers/crypto/caam/qi.c
View file

@ -83,13 +83,6 @@ EXPORT_SYMBOL(caam_congested);
static u64 times_congested;
#endif
/*
* CPU from where the module initialised. This is required because QMan driver
* requires CGRs to be removed from same CPU from where they were originally
* allocated.
*/
static int mod_init_cpu;
/*
* This is a a cache of buffers, from which the users of CAAM QI driver
* can allocate short (CAAM_QI_MEMCACHE_SIZE) buffers. It's faster than
@ -492,12 +485,11 @@ void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx)
}
EXPORT_SYMBOL(caam_drv_ctx_rel);
int caam_qi_shutdown(struct device *qidev)
void caam_qi_shutdown(struct device *qidev)
{
int i, ret;
int i;
struct caam_qi_priv *priv = dev_get_drvdata(qidev);
const cpumask_t *cpus = qman_affine_cpus();
struct cpumask old_cpumask = current->cpus_allowed;
for_each_cpu(i, cpus) {
struct napi_struct *irqtask;
@ -510,26 +502,12 @@ int caam_qi_shutdown(struct device *qidev)
dev_err(qidev, "Rsp FQ kill failed, cpu: %d\n", i);
}
/*
* QMan driver requires CGRs to be deleted from same CPU from where they
* were instantiated. Hence we get the module removal execute from the
* same CPU from where it was originally inserted.
*/
set_cpus_allowed_ptr(current, get_cpu_mask(mod_init_cpu));
ret = qman_delete_cgr(&priv->cgr);
if (ret)
dev_err(qidev, "Deletion of CGR failed: %d\n", ret);
else
qman_release_cgrid(priv->cgr.cgrid);
qman_delete_cgr_safe(&priv->cgr);
qman_release_cgrid(priv->cgr.cgrid);
kmem_cache_destroy(qi_cache);
/* Now that we're done with the CGRs, restore the cpus allowed mask */
set_cpus_allowed_ptr(current, &old_cpumask);
platform_device_unregister(priv->qi_pdev);
return ret;
}
static void cgr_cb(struct qman_portal *qm, struct qman_cgr *cgr, int congested)
@ -718,22 +696,11 @@ int caam_qi_init(struct platform_device *caam_pdev)
struct device *ctrldev = &caam_pdev->dev, *qidev;
struct caam_drv_private *ctrlpriv;
const cpumask_t *cpus = qman_affine_cpus();
struct cpumask old_cpumask = current->cpus_allowed;
static struct platform_device_info qi_pdev_info = {
.name = "caam_qi",
.id = PLATFORM_DEVID_NONE
};
/*
* QMAN requires CGRs to be removed from same CPU+portal from where it
* was originally allocated. Hence we need to note down the
* initialisation CPU and use the same CPU for module exit.
* We select the first CPU to from the list of portal owning CPUs.
* Then we pin module init to this CPU.
*/
mod_init_cpu = cpumask_first(cpus);
set_cpus_allowed_ptr(current, get_cpu_mask(mod_init_cpu));
qi_pdev_info.parent = ctrldev;
qi_pdev_info.dma_mask = dma_get_mask(ctrldev);
qi_pdev = platform_device_register_full(&qi_pdev_info);
@ -795,8 +762,6 @@ int caam_qi_init(struct platform_device *caam_pdev)
return -ENOMEM;
}
/* Done with the CGRs; restore the cpus allowed mask */
set_cpus_allowed_ptr(current, &old_cpumask);
#ifdef CONFIG_DEBUG_FS
debugfs_create_file("qi_congested", 0444, ctrlpriv->ctl,
&times_congested, &caam_fops_u64_ro);

2
drivers/crypto/caam/qi.h
View file

@ -173,7 +173,7 @@ int caam_drv_ctx_update(struct caam_drv_ctx *drv_ctx, u32 *sh_desc);
void caam_drv_ctx_rel(struct caam_drv_ctx *drv_ctx);
int caam_qi_init(struct platform_device *pdev);
int caam_qi_shutdown(struct device *dev);
void caam_qi_shutdown(struct device *dev);
/**
* qi_cache_alloc - Allocate buffers from CAAM-QI cache