crypto: qat - add support for decompression service to GEN6 devices

Add support to configure decompression as a separate service for QAT GEN6
devices. A new arbiter configuration has been added to map the hardware
decompression threads to all ring pairs.

The decompression service is enabled via sysfs by writing "decomp" to
"/sys/bus/pci/devices/<BDF>/qat/cfg_services".

The decompression service is not supported on QAT GEN2 and GEN4 devices,
and attempting it results in an invalid write error. The existing
compression service for QAT GEN2 and GEN4 devices remains unchanged and
supports both compression and decompression operations on the same ring
pair.

Co-developed-by: Karthikeyan Gopal <karthikeyan.gopal@intel.com>
Signed-off-by: Karthikeyan Gopal <karthikeyan.gopal@intel.com>
Signed-off-by: Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/intel/qat/qat_6xxx/adf_6xxx_hw_data.c

@@ -76,6 +76,10 @@ static const unsigned long thrd_mask_dcc[ADF_6XXX_MAX_ACCELENGINES] = {
 	0x00, 0x00, 0x00, 0x00, 0x07, 0x07, 0x03, 0x03, 0x00
 };
 
+static const unsigned long thrd_mask_dcpr[ADF_6XXX_MAX_ACCELENGINES] = {
+	0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x00
+};
+
 static const char *const adf_6xxx_fw_objs[] = {
 	[ADF_FW_CY_OBJ] = ADF_6XXX_CY_OBJ,
 	[ADF_FW_DC_OBJ] = ADF_6XXX_DC_OBJ,
@@ -126,6 +130,9 @@ static int get_service(unsigned long *mask)
 	if (test_and_clear_bit(SVC_DCC, mask))
 		return SVC_DCC;
 
+	if (test_and_clear_bit(SVC_DECOMP, mask))
+		return SVC_DECOMP;
+
 	return -EINVAL;
 }
 
@@ -139,6 +146,8 @@ static enum adf_cfg_service_type get_ring_type(enum adf_services service)
 	case SVC_DC:
 	case SVC_DCC:
 		return COMP;
+	case SVC_DECOMP:
+		return DECOMP;
 	default:
 		return UNUSED;
 	}
@@ -155,6 +164,8 @@ static const unsigned long *get_thrd_mask(enum adf_services service)
 		return thrd_mask_cpr;
 	case SVC_DCC:
 		return thrd_mask_dcc;
+	case SVC_DECOMP:
+		return thrd_mask_dcpr;
 	default:
 		return NULL;
 	}
@@ -648,7 +659,7 @@ static u32 get_accel_cap(struct adf_accel_dev *accel_dev)
 		caps |= capabilities_asym;
 	if (test_bit(SVC_SYM, &mask))
 		caps |= capabilities_sym;
-	if (test_bit(SVC_DC, &mask))
+	if (test_bit(SVC_DC, &mask) || test_bit(SVC_DECOMP, &mask))
 		caps |= capabilities_dc;
 	if (test_bit(SVC_DCC, &mask)) {
 		/*

drivers/crypto/intel/qat/qat_common/adf_cfg_common.h

@@ -29,6 +29,7 @@ enum adf_cfg_service_type {
 	COMP,
 	SYM,
 	ASYM,
+	DECOMP,
 	USED
 };
 

drivers/crypto/intel/qat/qat_common/adf_cfg_services.c

@@ -15,6 +15,7 @@ static const char *const adf_cfg_services[] = {
 	[SVC_SYM] = ADF_CFG_SYM,
 	[SVC_DC] = ADF_CFG_DC,
 	[SVC_DCC] = ADF_CFG_DCC,
+	[SVC_DECOMP] = ADF_CFG_DECOMP,
 };
 
 /*
@@ -43,6 +44,7 @@ static_assert(BITS_PER_LONG >= SVC_BASE_COUNT);
 static_assert(sizeof(ADF_CFG_SYM ADF_SERVICES_DELIMITER
 		     ADF_CFG_ASYM ADF_SERVICES_DELIMITER
 		     ADF_CFG_DC ADF_SERVICES_DELIMITER
+		     ADF_CFG_DECOMP ADF_SERVICES_DELIMITER
 		     ADF_CFG_DCC) < ADF_CFG_MAX_VAL_LEN_IN_BYTES);
 
 static int adf_service_string_to_mask(struct adf_accel_dev *accel_dev, const char *buf,
@@ -167,6 +169,9 @@ int adf_get_service_enabled(struct adf_accel_dev *accel_dev)
 	if (test_bit(SVC_DC, &mask))
 		return SVC_DC;
 
+	if (test_bit(SVC_DECOMP, &mask))
+		return SVC_DECOMP;
+
 	if (test_bit(SVC_DCC, &mask))
 		return SVC_DCC;
 

drivers/crypto/intel/qat/qat_common/adf_cfg_services.h

@@ -11,6 +11,7 @@ enum adf_services {
 	SVC_ASYM = 0,
 	SVC_SYM,
 	SVC_DC,
+	SVC_DECOMP,
 	SVC_DCC,
 	SVC_BASE_COUNT
 };

drivers/crypto/intel/qat/qat_common/adf_cfg_strings.h

@@ -24,6 +24,7 @@
 #define ADF_CY "Cy"
 #define ADF_DC "Dc"
 #define ADF_CFG_DC "dc"
+#define ADF_CFG_DECOMP "decomp"
 #define ADF_CFG_CY "sym;asym"
 #define ADF_CFG_SYM "sym"
 #define ADF_CFG_ASYM "asym"

drivers/crypto/intel/qat/qat_common/adf_gen4_hw_data.c

@@ -262,6 +262,9 @@ bool adf_gen4_services_supported(unsigned long mask)
 	if (mask >= BIT(SVC_BASE_COUNT))
 		return false;
 
+	if (test_bit(SVC_DECOMP, &mask))
+		return false;
+
 	switch (num_svc) {
 	case ADF_ONE_SERVICE:
 		return true;

drivers/crypto/intel/qat/qat_common/adf_sysfs.c

@@ -269,6 +269,8 @@ static ssize_t rp2srv_show(struct device *dev, struct device_attribute *attr,
 		return sysfs_emit(buf, "%s\n", ADF_CFG_SYM);
 	case ASYM:
 		return sysfs_emit(buf, "%s\n", ADF_CFG_ASYM);
+	case DECOMP:
+		return sysfs_emit(buf, "%s\n", ADF_CFG_DECOMP);
 	default:
 		break;
 	}