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: stable@xxxxxxxxxxxxxxx
Signed-off-by: Yashpal Dutta <yashpal.dutta@xxxxxxxxxxxxx>
---
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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