crypto: iaa - Add support for deflate-iaa compression algorithm

This patch registers the deflate-iaa deflate compression algorithm and
hooks it up to the IAA hardware using the 'fixed' compression mode
introduced in the previous patch.

Because the IAA hardware has a 4k history-window limitation, only
buffers <= 4k, or that have been compressed using a <= 4k history
window, are technically compliant with the deflate spec, which allows
for a window of up to 32k.  Because of this limitation, the IAA fixed
mode deflate algorithm is given its own algorithm name, 'deflate-iaa'.

With this change, the deflate-iaa crypto algorithm is registered and
operational, and compression and decompression operations are fully
enabled following the successful binding of the first IAA workqueue
to the iaa_crypto sub-driver.

when there are no IAA workqueues bound to the driver, the IAA crypto
algorithm can be unregistered by removing the module.

A new iaa_crypto 'verify_compress' driver attribute is also added,
allowing the user to toggle compression verification.  If set, each
compress will be internally decompressed and the contents verified,
returning error codes if unsuccessful.  This can be toggled with 0/1:

  echo 0 > /sys/bus/dsa/drivers/crypto/verify_compress

The default setting is '1' - verify all compresses.

The verify_compress value setting at the time the algorithm is
registered is captured in the algorithm's crypto_ctx and used for all
compresses when using the algorithm.

[ Based on work originally by George Powley, Jing Lin and Kyung Min
Park ]

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

crypto/testmgr.c

@@ -4796,6 +4796,16 @@ static const struct alg_test_desc alg_test_descs[] = {
 				.decomp = __VECS(deflate_decomp_tv_template)
 			}
 		}
+	}, {
+		.alg = "deflate-iaa",
+		.test = alg_test_comp,
+		.fips_allowed = 1,
+		.suite = {
+			.comp = {
+				.comp = __VECS(deflate_comp_tv_template),
+				.decomp = __VECS(deflate_decomp_tv_template)
+			}
+		}
 	}, {
 		.alg = "dh",
 		.test = alg_test_kpp,

drivers/crypto/intel/iaa/iaa_crypto.h

@@ -10,15 +10,42 @@
 
 #define IDXD_SUBDRIVER_NAME		"crypto"
 
+#define IAA_DECOMP_ENABLE		BIT(0)
+#define IAA_DECOMP_FLUSH_OUTPUT		BIT(1)
+#define IAA_DECOMP_CHECK_FOR_EOB	BIT(2)
+#define IAA_DECOMP_STOP_ON_EOB		BIT(3)
+#define IAA_DECOMP_SUPPRESS_OUTPUT	BIT(9)
+
+#define IAA_COMP_FLUSH_OUTPUT		BIT(1)
+#define IAA_COMP_APPEND_EOB		BIT(2)
+
+#define IAA_COMPLETION_TIMEOUT		1000000
+
+#define IAA_ANALYTICS_ERROR		0x0a
+#define IAA_ERROR_DECOMP_BUF_OVERFLOW	0x0b
+#define IAA_ERROR_COMP_BUF_OVERFLOW	0x19
+#define IAA_ERROR_WATCHDOG_EXPIRED	0x24
+
 #define IAA_COMP_MODES_MAX		2
 
 #define FIXED_HDR			0x2
 #define FIXED_HDR_SIZE			3
 
+#define IAA_COMP_FLAGS			(IAA_COMP_FLUSH_OUTPUT | \
+					 IAA_COMP_APPEND_EOB)
+
+#define IAA_DECOMP_FLAGS		(IAA_DECOMP_ENABLE |	   \
+					 IAA_DECOMP_FLUSH_OUTPUT | \
+					 IAA_DECOMP_CHECK_FOR_EOB | \
+					 IAA_DECOMP_STOP_ON_EOB)
+
 /* Representation of IAA workqueue */
 struct iaa_wq {
 	struct list_head	list;
+
 	struct idxd_wq		*wq;
+	int			ref;
+	bool			remove;
 
 	struct iaa_device	*iaa_device;
 };
@@ -119,4 +146,13 @@ int add_iaa_compression_mode(const char *name,
 
 void remove_iaa_compression_mode(const char *name);
 
+enum iaa_mode {
+	IAA_MODE_FIXED,
+};
+
+struct iaa_compression_ctx {
+	enum iaa_mode	mode;
+	bool		verify_compress;
+};
+
 #endif