diff options
| author | Kim Phillips <kim.phillips@freescale.com> | 2012-06-23 04:48:57 +0400 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-06-27 10:42:07 +0400 |
| commit | a0ca6ca022ac197e159bb5d22a08e3c3aebb242c (patch) | |
| tree | fbd194b3c93e8cf2938e1e4317a926578c22bc96 /drivers/crypto | |
| parent | 14a8e29cc2012394d3e886b11402eabd49a4d609 (diff) | |
| download | linux-a0ca6ca022ac197e159bb5d22a08e3c3aebb242c.tar.xz | |
crypto: caam - one tasklet per job ring
there is no noticeable benefit for multiple cores to process one
job ring's output ring: in fact, we can benefit from cache effects
of having the back-half stay on the core that receives a particular
ring's interrupts, and further relax general contention and the
locking involved with reading outring_used, since tasklets run
atomically.
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
| -rw-r--r-- | drivers/crypto/caam/intern.h | 2 | ||||
| -rw-r--r-- | drivers/crypto/caam/jr.c | 13 |
2 files changed, 6 insertions, 9 deletions
diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h index ed2b739f934b..5cd4c1b268a1 100644 --- a/drivers/crypto/caam/intern.h +++ b/drivers/crypto/caam/intern.h @@ -43,7 +43,7 @@ struct caam_drv_private_jr { struct device *parentdev; /* points back to controller dev */ int ridx; struct caam_job_ring __iomem *rregs; /* JobR's register space */ - struct tasklet_struct irqtask[NR_CPUS]; + struct tasklet_struct irqtask; int irq; /* One per queue */ int assign; /* busy/free */ diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index 0adaad1b8cf7..7074a1a29e8b 100644 --- a/drivers/crypto/caam/jr.c +++ b/drivers/crypto/caam/jr.c @@ -43,7 +43,7 @@ static irqreturn_t caam_jr_interrupt(int irq, void *st_dev) wr_reg32(&jrp->rregs->jrintstatus, irqstate); preempt_disable(); - tasklet_schedule(&jrp->irqtask[smp_processor_id()]); + tasklet_schedule(&jrp->irqtask); preempt_enable(); return IRQ_HANDLED; @@ -322,11 +322,9 @@ static int caam_jr_init(struct device *dev) jrp = dev_get_drvdata(dev); - /* Connect job ring interrupt handler. */ - for_each_possible_cpu(i) - tasklet_init(&jrp->irqtask[i], caam_jr_dequeue, - (unsigned long)dev); + tasklet_init(&jrp->irqtask, caam_jr_dequeue, (unsigned long)dev); + /* Connect job ring interrupt handler. */ error = request_irq(jrp->irq, caam_jr_interrupt, IRQF_SHARED, "caam-jobr", dev); if (error) { @@ -416,12 +414,11 @@ int caam_jr_shutdown(struct device *dev) { struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); dma_addr_t inpbusaddr, outbusaddr; - int ret, i; + int ret; ret = caam_reset_hw_jr(dev); - for_each_possible_cpu(i) - tasklet_kill(&jrp->irqtask[i]); + tasklet_kill(&jrp->irqtask); /* Release interrupt */ free_irq(jrp->irq, dev); |