Acked-by: Ruchika Gupta <ruchika.gu...@freescale.com> > -----Original Message----- > From: Yashpal Dutta [mailto:yashpal.du...@freescale.com] > Sent: Friday, March 21, 2014 12:21 AM > To: linux-crypto@vger.kernel.org; Geanta Neag Horia Ioan-B05471; Garg Vakul- > B16394; Gupta Ruchika-R66431 > Cc: Dutta Yashpal-B05456; sta...@vger.kernel.org > Subject: [PATCH v3] crypto: caam - power management support for caam job- > ring > > Job ring is suspended gracefully and resume afresh. > > Both Sleep (where device will remain powered-on) and Deep-sleep (where > device will be powered-down are handled gracefully. Persistance sessions are > not supported across deep-sleep. > > Cc: sta...@vger.kernel.org > Signed-off-by: Yashpal Dutta <yashpal.du...@freescale.com> > --- > drivers/crypto/caam/intern.h | 2 + > drivers/crypto/caam/jr.c | 257 +++++++++++++++++++++++++++++++--------- > --- > 2 files changed, 190 insertions(+), 69 deletions(-) > > diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h > index 6d85fcc..0d41d05 100644 > --- a/drivers/crypto/caam/intern.h > +++ b/drivers/crypto/caam/intern.h > @@ -54,6 +54,8 @@ struct caam_drv_private_jr { > int inp_ring_write_index; /* Input index "tail" */ > int head; /* entinfo (s/w ring) head index */ > dma_addr_t *inpring; /* Base of input ring, alloc DMA-safe */ > + dma_addr_t inpbusaddr; /* Input ring physical address */ > + dma_addr_t outbusaddr; /* Output ring physical address */ > spinlock_t outlock ____cacheline_aligned; /* Output ring index lock > */ > int out_ring_read_index; /* Output index "tail" */ > int tail; /* entinfo (s/w ring) tail index */ > diff --git a/drivers/crypto/caam/jr.c b/drivers/crypto/caam/jr.c index > 1d80bd3..2a79218 100644 > --- a/drivers/crypto/caam/jr.c > +++ b/drivers/crypto/caam/jr.c > @@ -68,7 +68,6 @@ static int caam_reset_hw_jr(struct device *dev) int > caam_jr_shutdown(struct device *dev) { > struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); > - dma_addr_t inpbusaddr, outbusaddr; > int ret; > > ret = caam_reset_hw_jr(dev); > @@ -78,13 +77,10 @@ int caam_jr_shutdown(struct device *dev) > /* Release interrupt */ > free_irq(jrp->irq, dev); > > - /* Free rings */ > - inpbusaddr = rd_reg64(&jrp->rregs->inpring_base); > - outbusaddr = rd_reg64(&jrp->rregs->outring_base); > dma_free_coherent(dev, sizeof(dma_addr_t) * JOBR_DEPTH, > - jrp->inpring, inpbusaddr); > + jrp->inpring, jrp->inpbusaddr); > dma_free_coherent(dev, sizeof(struct jr_outentry) * JOBR_DEPTH, > - jrp->outring, outbusaddr); > + jrp->outring, jrp->outbusaddr); > kfree(jrp->entinfo); > > return ret; > @@ -159,78 +155,82 @@ static irqreturn_t caam_jr_interrupt(int irq, void > *st_dev) > return IRQ_HANDLED; > } > > -/* Deferred service handler, run as interrupt-fired tasklet */ -static void > caam_jr_dequeue(unsigned long devarg) > +/* Consume the processed output ring Job */ static inline void > +caam_jr_consume(struct device *dev) > { > int hw_idx, sw_idx, i, head, tail; > - struct device *dev = (struct device *)devarg; > struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); > void (*usercall)(struct device *dev, u32 *desc, u32 status, void > *arg); > u32 *userdesc, userstatus; > void *userarg; > > - while (rd_reg32(&jrp->rregs->outring_used)) { > + head = ACCESS_ONCE(jrp->head); > + spin_lock(&jrp->outlock); > > - head = ACCESS_ONCE(jrp->head); > + sw_idx = tail = jrp->tail; > + hw_idx = jrp->out_ring_read_index; > > - spin_lock(&jrp->outlock); > + for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) { > + sw_idx = (tail + i) & (JOBR_DEPTH - 1); > > - sw_idx = tail = jrp->tail; > - hw_idx = jrp->out_ring_read_index; > + smp_read_barrier_depends(); > + if (jrp->outring[hw_idx].desc == > + jrp->entinfo[sw_idx].desc_addr_dma) > + break; /* found */ > + } > + /* we should never fail to find a matching descriptor */ > + BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0); > > - for (i = 0; CIRC_CNT(head, tail + i, JOBR_DEPTH) >= 1; i++) { > - sw_idx = (tail + i) & (JOBR_DEPTH - 1); > + /* Unmap just-run descriptor so we can post-process */ > + dma_unmap_single(dev, jrp->outring[hw_idx].desc, > + jrp->entinfo[sw_idx].desc_size, > + DMA_TO_DEVICE); > > - smp_read_barrier_depends(); > + /* mark completed, avoid matching on a recycled desc addr */ > + jrp->entinfo[sw_idx].desc_addr_dma = 0; > > - if (jrp->outring[hw_idx].desc == > - jrp->entinfo[sw_idx].desc_addr_dma) > - break; /* found */ > - } > - /* we should never fail to find a matching descriptor */ > - BUG_ON(CIRC_CNT(head, tail + i, JOBR_DEPTH) <= 0); > - > - /* Unmap just-run descriptor so we can post-process */ > - dma_unmap_single(dev, jrp->outring[hw_idx].desc, > - jrp->entinfo[sw_idx].desc_size, > - DMA_TO_DEVICE); > - > - /* mark completed, avoid matching on a recycled desc addr */ > - jrp->entinfo[sw_idx].desc_addr_dma = 0; > - > - /* Stash callback params for use outside of lock */ > - usercall = jrp->entinfo[sw_idx].callbk; > - userarg = jrp->entinfo[sw_idx].cbkarg; > - userdesc = jrp->entinfo[sw_idx].desc_addr_virt; > - userstatus = jrp->outring[hw_idx].jrstatus; > - > - /* set done */ > - wr_reg32(&jrp->rregs->outring_rmvd, 1); > - > - jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) & > - (JOBR_DEPTH - 1); > - > - /* > - * if this job completed out-of-order, do not increment > - * the tail. Otherwise, increment tail by 1 plus the > - * number of subsequent jobs already completed out-of-order > - */ > - if (sw_idx == tail) { > - do { > - tail = (tail + 1) & (JOBR_DEPTH - 1); > - smp_read_barrier_depends(); > - } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 && > - jrp->entinfo[tail].desc_addr_dma == 0); > - > - jrp->tail = tail; > - } > + /* Stash callback params for use outside of lock */ > + usercall = jrp->entinfo[sw_idx].callbk; > + userarg = jrp->entinfo[sw_idx].cbkarg; > + userdesc = jrp->entinfo[sw_idx].desc_addr_virt; > + userstatus = jrp->outring[hw_idx].jrstatus; > > - spin_unlock(&jrp->outlock); > + /* set done */ > + wr_reg32(&jrp->rregs->outring_rmvd, 1); > > - /* Finally, execute user's callback */ > - usercall(dev, userdesc, userstatus, userarg); > + jrp->out_ring_read_index = (jrp->out_ring_read_index + 1) & > + (JOBR_DEPTH - 1); > + > + /* > + * if this job completed out-of-order, do not increment > + * the tail. Otherwise, increment tail by 1 plus the > + * number of subsequent jobs already completed out-of-order > + */ > + if (sw_idx == tail) { > + do { > + tail = (tail + 1) & (JOBR_DEPTH - 1); > + smp_read_barrier_depends(); > + } while (CIRC_CNT(head, tail, JOBR_DEPTH) >= 1 && > + jrp->entinfo[tail].desc_addr_dma == 0); > + > + jrp->tail = tail; > } > > + spin_unlock(&jrp->outlock); > + > + /* Finally, execute user's callback */ > + usercall(dev, userdesc, userstatus, userarg); } > + > +/* Deferred service handler, run as interrupt-fired tasklet */ static > +void caam_jr_dequeue(unsigned long devarg) { > + struct device *dev = (struct device *)devarg; > + struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); > + > + while (rd_reg32(&jrp->rregs->outring_used)) > + caam_jr_consume(dev); > + > /* reenable / unmask IRQs */ > clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); } @@ -368,13 > +368,131 @@ int caam_jr_enqueue(struct device *dev, u32 *desc, } > EXPORT_SYMBOL(caam_jr_enqueue); > > +#ifdef CONFIG_PM > +/* Return Failure for Job pending in input ring */ static void > +caam_fail_inpjobs(struct device *dev) { > + struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); > + void (*usercall)(struct device *dev, u32 *desc, u32 status, void > *arg); > + u32 *userdesc; > + void *userarg; > + int sw_idx; > + > + /* Check for jobs left after reaching output ring and return error */ > + for (sw_idx = 0; sw_idx < JOBR_DEPTH; sw_idx++) { > + if (jrp->entinfo[sw_idx].desc_addr_dma != 0) { > + usercall = jrp->entinfo[sw_idx].callbk; > + userarg = jrp->entinfo[sw_idx].cbkarg; > + userdesc = jrp->entinfo[sw_idx].desc_addr_virt; > + usercall(dev, userdesc, -EIO, userarg); > + jrp->entinfo[sw_idx].desc_addr_dma = 0; > + } > + } > +} > + > +/* Suspend handler for Job Ring */ > +static int jr_suspend(struct device *dev) { > + struct caam_drv_private_jr *jrp = dev_get_drvdata(dev); > + unsigned int timeout = 100000; > + int ret = 0; > + > + /* > + * mask interrupts since we are going to poll > + * for reset completion status > + */ > + setbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); > + > + /* > + * Cleanup all the pending completed Jobs to make room for > + * in Job's coming to Outring during flush > + */ > + while (rd_reg32(&jrp->rregs->outring_used)) > + caam_jr_consume(dev); > + > + /* initiate flush (required prior to reset) */ > + wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET); > + while (((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) == > + JRINT_ERR_HALT_INPROGRESS) && --timeout) > + cpu_relax(); > + > + if ((rd_reg32(&jrp->rregs->jrintstatus) & JRINT_ERR_HALT_MASK) != > + JRINT_ERR_HALT_COMPLETE || timeout == 0) { > + dev_err(dev, "failed to flush job ring %d\n", jrp->ridx); > + ret = -EIO; > + goto err; > + } > + > + /* > + * Disallow any further addition in Job Ring by making input_ring > + * size ZERO. If output complete ring processing try to enqueue > + * more Job's back to JR, it will return -EBUSY > + */ > + wr_reg32(&jrp->rregs->inpring_size, 0); > + > + while (rd_reg32(&jrp->rregs->outring_used)) > + caam_jr_consume(dev); > + > + caam_fail_inpjobs(dev); > + > + /* initiate reset */ > + timeout = 100000; > + wr_reg32(&jrp->rregs->jrcommand, JRCR_RESET); > + while ((rd_reg32(&jrp->rregs->jrcommand) & JRCR_RESET) && --timeout) > + cpu_relax(); > + > + if (timeout == 0) { > + dev_err(dev, "failed to reset job ring %d\n", jrp->ridx); > + ret = -EIO; > + goto err; > + } > + > +err: > + /* unmask interrupts */ > + clrbits32(&jrp->rregs->rconfig_lo, JRCFG_IMSK); > + return ret; > +} > + > +/* Resume handler for Job Ring */ > +static int jr_resume(struct device *dev) { > + struct caam_drv_private_jr *jrp; > + > + jrp = dev_get_drvdata(dev); > + > + memset(jrp->entinfo, 0, sizeof(struct caam_jrentry_info) * > +JOBR_DEPTH); > + > + /* Setup rings */ > + jrp->inp_ring_write_index = 0; > + jrp->out_ring_read_index = 0; > + jrp->head = 0; > + jrp->tail = 0; > + > + /* Setup ring base registers */ > + wr_reg64(&jrp->rregs->inpring_base, jrp->inpbusaddr); > + wr_reg64(&jrp->rregs->outring_base, jrp->outbusaddr); > + /* Setup ring size */ > + wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH); > + wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH); > + > + setbits32(&jrp->rregs->rconfig_lo, JOBR_INTC | > + (JOBR_INTC_COUNT_THLD << JRCFG_ICDCT_SHIFT) | > + (JOBR_INTC_TIME_THLD << JRCFG_ICTT_SHIFT)); > + return 0; > +} > + > +const struct dev_pm_ops jr_pm_ops = { > + .suspend = jr_suspend, > + .resume = jr_resume, > +}; > +#endif /* CONFIG_PM */ > + > /* > * Init JobR independent of platform property detection > */ > static int caam_jr_init(struct device *dev) { > struct caam_drv_private_jr *jrp; > - dma_addr_t inpbusaddr, outbusaddr; > int i, error; > > jrp = dev_get_drvdata(dev); > @@ -397,10 +515,11 @@ static int caam_jr_init(struct device *dev) > return error; > > jrp->inpring = dma_alloc_coherent(dev, sizeof(dma_addr_t) * > JOBR_DEPTH, > - &inpbusaddr, GFP_KERNEL); > + &jrp->inpbusaddr, GFP_KERNEL); > > jrp->outring = dma_alloc_coherent(dev, sizeof(struct jr_outentry) * > - JOBR_DEPTH, &outbusaddr, GFP_KERNEL); > + JOBR_DEPTH, &jrp->outbusaddr, > + GFP_KERNEL); > > jrp->entinfo = kzalloc(sizeof(struct caam_jrentry_info) * JOBR_DEPTH, > GFP_KERNEL); > @@ -412,17 +531,14 @@ static int caam_jr_init(struct device *dev) > return -ENOMEM; > } > > - for (i = 0; i < JOBR_DEPTH; i++) > - jrp->entinfo[i].desc_addr_dma = !0; > - > /* Setup rings */ > jrp->inp_ring_write_index = 0; > jrp->out_ring_read_index = 0; > jrp->head = 0; > jrp->tail = 0; > > - wr_reg64(&jrp->rregs->inpring_base, inpbusaddr); > - wr_reg64(&jrp->rregs->outring_base, outbusaddr); > + wr_reg64(&jrp->rregs->inpring_base, jrp->inpbusaddr); > + wr_reg64(&jrp->rregs->outring_base, jrp->outbusaddr); > wr_reg32(&jrp->rregs->inpring_size, JOBR_DEPTH); > wr_reg32(&jrp->rregs->outring_size, JOBR_DEPTH); > > @@ -518,6 +634,9 @@ static struct platform_driver caam_jr_driver = { > .name = "caam_jr", > .owner = THIS_MODULE, > .of_match_table = caam_jr_match, > +#ifdef CONFIG_PM > + .pm = &jr_pm_ops, > +#endif > }, > .probe = caam_jr_probe, > .remove = caam_jr_remove, > -- > 1.8.1.2 >
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