crypto: qat - exchange device capabilities over PFVF

Allow the VF driver to get the supported device capabilities through PFVF,
by adding a new block message, the Capability Summary.

This messages allows to exchange the capability through masks, which
report, depending on the Capability Summary version, up to the following
information:
- algorithms and/or services that are supported by the device (e.g.
  symmetric crypto, data compression, etc.)
- (extended) compression capabilities, with details about the compression
  service (e.g. if compress and verify is supported by this device)
- the frequency of the device

This patch supports the latest Capabilities Summary version 3 for VFs,
but will limit support for the PF driver to version 2. This change also
increases the PFVF protocol to version 2.

Signed-off-by: Marco Chiappero <marco.chiappero@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Fiona Trahe <fiona.trahe@intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/qat/qat_common/adf_accel_devices.h

@@ -203,6 +203,7 @@ struct adf_hw_device_data {
 	u32 straps;
 	u32 accel_capabilities_mask;
 	u32 extended_dc_capabilities;
+	u32 clock_frequency;
 	u32 instance_id;
 	u16 accel_mask;
 	u32 ae_mask;

drivers/crypto/qat/qat_common/adf_pfvf_msg.h

@@ -87,8 +87,10 @@ enum vf2pf_msgtype {
 
 /* VF/PF compatibility version. */
 enum pfvf_compatibility_version {
-	/* Reference to the current version */
-	ADF_PFVF_COMPAT_THIS_VERSION		= 0x01,
+	/* Support for extended capabilities */
+	ADF_PFVF_COMPAT_CAPABILITIES		= 0x02,
+	/* Reference to the latest version */
+	ADF_PFVF_COMPAT_THIS_VERSION		= 0x02,
 };
 
 /* PF->VF Version Response */
@@ -133,7 +135,9 @@ enum pf2vf_blkmsg_error {
  * 16..23 - 64 byte message
  * 24..27 - 128 byte message
  */
-/* No block messages as of yet */
+enum vf2pf_blkmsg_req_type {
+	ADF_VF2PF_BLKMSG_REQ_CAP_SUMMARY	= 0x02,
+};
 
 #define ADF_VF2PF_SMALL_BLOCK_TYPE_MAX \
 		(FIELD_MAX(ADF_VF2PF_SMALL_BLOCK_TYPE_MASK))
@@ -171,4 +175,29 @@ struct pfvf_blkmsg_header {
 #define ADF_PFVF_BLKMSG_VER_BYTE		0
 #define ADF_PFVF_BLKMSG_LEN_BYTE		1
 
+/* PF/VF Capabilities message values */
+enum blkmsg_capabilities_versions {
+	ADF_PFVF_CAPABILITIES_V1_VERSION	= 0x01,
+	ADF_PFVF_CAPABILITIES_V2_VERSION	= 0x02,
+	ADF_PFVF_CAPABILITIES_V3_VERSION	= 0x03,
+};
+
+struct capabilities_v1 {
+	struct pfvf_blkmsg_header hdr;
+	u32 ext_dc_caps;
+} __packed;
+
+struct capabilities_v2 {
+	struct pfvf_blkmsg_header hdr;
+	u32 ext_dc_caps;
+	u32 capabilities;
+} __packed;
+
+struct capabilities_v3 {
+	struct pfvf_blkmsg_header hdr;
+	u32 ext_dc_caps;
+	u32 capabilities;
+	u32 frequency;
+} __packed;
+
 #endif /* ADF_PFVF_MSG_H */

drivers/crypto/qat/qat_common/adf_pfvf_pf_msg.c

@@ -18,3 +18,21 @@ void adf_pf2vf_notify_restarting(struct adf_accel_dev *accel_dev)
 				"Failed to send restarting msg to VF%d\n", i);
 	}
 }
+
+int adf_pf_capabilities_msg_provider(struct adf_accel_dev *accel_dev,
+				     u8 *buffer, u8 compat)
+{
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	struct capabilities_v2 caps_msg;
+
+	caps_msg.ext_dc_caps = hw_data->extended_dc_capabilities;
+	caps_msg.capabilities = hw_data->accel_capabilities_mask;
+
+	caps_msg.hdr.version = ADF_PFVF_CAPABILITIES_V2_VERSION;
+	caps_msg.hdr.payload_size =
+			ADF_PFVF_BLKMSG_PAYLOAD_SIZE(struct capabilities_v2);
+
+	memcpy(buffer, &caps_msg, sizeof(caps_msg));
+
+	return 0;
+}

drivers/crypto/qat/qat_common/adf_pfvf_pf_msg.h

@@ -10,4 +10,7 @@ void adf_pf2vf_notify_restarting(struct adf_accel_dev *accel_dev);
 typedef int (*adf_pf2vf_blkmsg_provider)(struct adf_accel_dev *accel_dev,
 					 u8 *buffer, u8 compat);
 
+int adf_pf_capabilities_msg_provider(struct adf_accel_dev *accel_dev,
+				     u8 *buffer, u8 comapt);
+
 #endif /* ADF_PFVF_PF_MSG_H */

drivers/crypto/qat/qat_common/adf_pfvf_pf_proto.c

@@ -15,6 +15,7 @@ typedef u8 (*pf2vf_blkmsg_data_getter_fn)(u8 const *blkmsg, u8 byte);
 static const adf_pf2vf_blkmsg_provider pf2vf_blkmsg_providers[] = {
 	NULL,				  /* no message type defined for value 0 */
 	NULL,				  /* no message type defined for value 1 */
+	adf_pf_capabilities_msg_provider, /* ADF_VF2PF_BLKMSG_REQ_CAP_SUMMARY */
 };
 
 /**

drivers/crypto/qat/qat_common/adf_pfvf_vf_msg.c

@@ -92,3 +92,49 @@ int adf_vf2pf_request_version(struct adf_accel_dev *accel_dev)
 	accel_dev->vf.pf_compat_ver = pf_version;
 	return 0;
 }
+
+int adf_vf2pf_get_capabilities(struct adf_accel_dev *accel_dev)
+{
+	struct adf_hw_device_data *hw_data = accel_dev->hw_device;
+	struct capabilities_v3 cap_msg = { { 0 }, };
+	unsigned int len = sizeof(cap_msg);
+
+	if (accel_dev->vf.pf_compat_ver < ADF_PFVF_COMPAT_CAPABILITIES)
+		/* The PF is too old to support the extended capabilities */
+		return 0;
+
+	if (adf_send_vf2pf_blkmsg_req(accel_dev, ADF_VF2PF_BLKMSG_REQ_CAP_SUMMARY,
+				      (u8 *)&cap_msg, &len)) {
+		dev_err(&GET_DEV(accel_dev),
+			"QAT: Failed to get block message response\n");
+		return -EFAULT;
+	}
+
+	switch (cap_msg.hdr.version) {
+	default:
+		/* Newer version received, handle only the know parts */
+		fallthrough;
+	case ADF_PFVF_CAPABILITIES_V3_VERSION:
+		if (likely(len >= sizeof(struct capabilities_v3)))
+			hw_data->clock_frequency = cap_msg.frequency;
+		else
+			dev_info(&GET_DEV(accel_dev), "Could not get frequency");
+		fallthrough;
+	case ADF_PFVF_CAPABILITIES_V2_VERSION:
+		if (likely(len >= sizeof(struct capabilities_v2)))
+			hw_data->accel_capabilities_mask = cap_msg.capabilities;
+		else
+			dev_info(&GET_DEV(accel_dev), "Could not get capabilities");
+		fallthrough;
+	case ADF_PFVF_CAPABILITIES_V1_VERSION:
+		if (likely(len >= sizeof(struct capabilities_v1))) {
+			hw_data->extended_dc_capabilities = cap_msg.ext_dc_caps;
+		} else {
+			dev_err(&GET_DEV(accel_dev),
+				"Capabilities message truncated to %d bytes\n", len);
+			return -EFAULT;
+		}
+	}
+
+	return 0;
+}

drivers/crypto/qat/qat_common/adf_pfvf_vf_msg.h

@@ -7,6 +7,7 @@
 int adf_vf2pf_notify_init(struct adf_accel_dev *accel_dev);
 void adf_vf2pf_notify_shutdown(struct adf_accel_dev *accel_dev);
 int adf_vf2pf_request_version(struct adf_accel_dev *accel_dev);
+int adf_vf2pf_get_capabilities(struct adf_accel_dev *accel_dev);
 #else
 static inline int adf_vf2pf_notify_init(struct adf_accel_dev *accel_dev)
 {

drivers/crypto/qat/qat_common/adf_pfvf_vf_proto.c

@@ -341,8 +341,17 @@ bool adf_recv_and_handle_pf2vf_msg(struct adf_accel_dev *accel_dev)
  */
 int adf_enable_vf2pf_comms(struct adf_accel_dev *accel_dev)
 {
+	int ret;
+
 	adf_pfvf_crc_init();
 	adf_enable_pf2vf_interrupts(accel_dev);
-	return adf_vf2pf_request_version(accel_dev);
+
+	ret = adf_vf2pf_request_version(accel_dev);
+	if (ret)
+		return ret;
+
+	ret = adf_vf2pf_get_capabilities(accel_dev);
+
+	return ret;
 }
 EXPORT_SYMBOL_GPL(adf_enable_vf2pf_comms);