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| author | Gary R Hook <gary.hook@amd.com> | 2017-04-21 17:50:05 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2017-04-24 12:11:06 +0200 |
| commit | 7b537b24e76a1e8e6d7ea91483a45d5b1426809b (patch) | |
| tree | e5c8d1e19681b15efee9a99c084c96a10ed8db97 /drivers/crypto/ccp/ccp-dev.h | |
| parent | crypto: crypto4xx - rename ce_ring_contol to ce_ring_control (diff) | |
| download | linux-7b537b24e76a1e8e6d7ea91483a45d5b1426809b.tar.xz linux-7b537b24e76a1e8e6d7ea91483a45d5b1426809b.zip | |
crypto: ccp - Change ISR handler method for a v3 CCP
The CCP has the ability to perform several operations simultaneously,
but only one interrupt. When implemented as a PCI device and using
MSI-X/MSI interrupts, use a tasklet model to service interrupts. By
disabling and enabling interrupts from the CCP, coupled with the
queuing that tasklets provide, we can ensure that all events
(occurring on the device) are recognized and serviced.
This change fixes a problem wherein 2 or more busy queues can cause
notification bits to change state while a (CCP) interrupt is being
serviced, but after the queue state has been evaluated. This results
in the event being 'lost' and the queue hanging, waiting to be
serviced. Since the status bits are never fully de-asserted, the
CCP never generates another interrupt (all bits zero -> one or more
bits one), and no further CCP operations will be executed.
Cc: <stable@vger.kernel.org> # 4.9.x+
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto/ccp/ccp-dev.h')
| -rw-r--r-- | drivers/crypto/ccp/ccp-dev.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/ccp-dev.h b/drivers/crypto/ccp/ccp-dev.h index 2dfec019a832..0cb09d0feeaf 100644 --- a/drivers/crypto/ccp/ccp-dev.h +++ b/drivers/crypto/ccp/ccp-dev.h @@ -339,7 +339,10 @@ struct ccp_device { void *dev_specific; int (*get_irq)(struct ccp_device *ccp); void (*free_irq)(struct ccp_device *ccp); + unsigned int qim; unsigned int irq; + bool use_tasklet; + struct tasklet_struct irq_tasklet; /* I/O area used for device communication. The register mapping * starts at an offset into the mapped bar. |