[PATCH v4 02/10] crypto: iaa - Add an acomp_req flag CRYPTO_ACOMP_REQ_POLL to enable async mode.

[Kanchana P Sridhar <kanchana.p.sridhar@intel.com>]

If the iaa_crypto driver has async_mode set to true, and use_irq set to
false, it can still be forced to use synchronous mode by turning off the
CRYPTO_ACOMP_REQ_POLL flag in req->flags.

All three of the following need to be true for a request to be processed in
fully async poll mode:

 1) async_mode should be "true"
 2) use_irq should be "false"
 3) req->flags & CRYPTO_ACOMP_REQ_POLL should be "true"

Suggested-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Kanchana P Sridhar <kanchana.p.sridhar@intel.com>
---
 drivers/crypto/intel/iaa/iaa_crypto_main.c | 11 ++++++++++-
 include/crypto/acompress.h                 |  5 +++++
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/intel/iaa/iaa_crypto_main.c b/drivers/crypto/intel/iaa/iaa_crypto_main.c
index 237f87000070..2edaecd42cc6 100644
--- a/drivers/crypto/intel/iaa/iaa_crypto_main.c
+++ b/drivers/crypto/intel/iaa/iaa_crypto_main.c
@@ -1510,6 +1510,10 @@ static int iaa_comp_acompress(struct acomp_req *req)
 		return -EINVAL;
 	}
 
+	/* If the caller has requested no polling, disable async. */
+	if (!(req->flags & CRYPTO_ACOMP_REQ_POLL))
+		disable_async = true;
+
 	cpu = get_cpu();
 	wq = wq_table_next_wq(cpu);
 	put_cpu();
@@ -1702,6 +1706,7 @@ static int iaa_comp_adecompress(struct acomp_req *req)
 {
 	struct crypto_tfm *tfm = req->base.tfm;
 	dma_addr_t src_addr, dst_addr;
+	bool disable_async = false;
 	int nr_sgs, cpu, ret = 0;
 	struct iaa_wq *iaa_wq;
 	struct device *dev;
@@ -1717,6 +1722,10 @@ static int iaa_comp_adecompress(struct acomp_req *req)
 		return -EINVAL;
 	}
 
+	/* If the caller has requested no polling, disable async. */
+	if (!(req->flags & CRYPTO_ACOMP_REQ_POLL))
+		disable_async = true;
+
 	if (!req->dst)
 		return iaa_comp_adecompress_alloc_dest(req);
 
@@ -1765,7 +1774,7 @@ static int iaa_comp_adecompress(struct acomp_req *req)
 		req->dst, req->dlen, sg_dma_len(req->dst));
 
 	ret = iaa_decompress(tfm, req, wq, src_addr, req->slen,
-			     dst_addr, &req->dlen, false);
+			     dst_addr, &req->dlen, disable_async);
 	if (ret == -EINPROGRESS)
 		return ret;
 
diff --git a/include/crypto/acompress.h b/include/crypto/acompress.h
index 4252bab3d0e1..c1ed47405557 100644
--- a/include/crypto/acompress.h
+++ b/include/crypto/acompress.h
@@ -14,6 +14,11 @@
 #include <linux/crypto.h>
 
 #define CRYPTO_ACOMP_ALLOC_OUTPUT	0x00000001
+/*
+ * If set, the driver must have a way to submit the req, then
+ * poll its completion status for success/error.
+ */
+#define CRYPTO_ACOMP_REQ_POLL		0x00000002
 #define CRYPTO_ACOMP_DST_MAX		131072
 
 /**
-- 
2.27.0