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From:   Vineeth Pillai <viremana@linux.microsoft.com>
To:     Nuno Das Neves <nunodasneves@linux.microsoft.com>,
        Wei Liu <wei.liu@kernel.org>,
        Sunil Muthuswamy <sunilmut@microsoft.com>,
        Michael Kelley <mikelley@microsoft.com>,
        Vitaly Kuznetsov <vkuznets@redhat.com>
Cc:     Vineeth Pillai <viremana@linux.microsoft.com>,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org
Subject: [PATCH 06/17] mshv: SynIC port and connection hypercalls
Date:   Wed,  2 Jun 2021 17:20:51 +0000
Message-Id: <3125953aae8e7950a6da4c311ef163b79d6fb6b3.1622654100.git.viremana@linux.microsoft.com>
In-Reply-To: <cover.1622654100.git.viremana@linux.microsoft.com>
References: <cover.1622654100.git.viremana@linux.microsoft.com>
MIME-Version: 1.0
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Hyper-V enables inter-partition communication through the port and
connection constructs. More details about ports and connections in
TLFS chapter 11.

Implement hypercalls related to ports and connections for enabling
inter-partiion communication.

Signed-off-by: Vineeth Pillai <viremana@linux.microsoft.com>
---
 drivers/hv/hv_call.c                   | 161 +++++++++++++++++++++++++
 drivers/hv/mshv.h                      |  12 ++
 include/asm-generic/hyperv-tlfs.h      |  55 +++++++++
 include/linux/hyperv.h                 |   9 --
 include/uapi/asm-generic/hyperv-tlfs.h |  76 ++++++++++++
 5 files changed, 304 insertions(+), 9 deletions(-)

diff --git a/drivers/hv/hv_call.c b/drivers/hv/hv_call.c
index 025d4e2b892f..57db3a8ac94a 100644
--- a/drivers/hv/hv_call.c
+++ b/drivers/hv/hv_call.c
@@ -742,3 +742,164 @@ int hv_call_translate_virtual_address(
 	return hv_status_to_errno(status);
 }
 
+
+int
+hv_call_create_port(u64 port_partition_id, union hv_port_id port_id,
+		    u64 connection_partition_id,
+		    struct hv_port_info *port_info,
+		    u8 port_vtl, u8 min_connection_vtl, int node)
+{
+	struct hv_create_port *input;
+	unsigned long flags;
+	int ret = 0;
+	int status;
+
+	do {
+		local_irq_save(flags);
+		input = (struct hv_create_port *)(*this_cpu_ptr(
+				hyperv_pcpu_input_arg));
+		memset(input, 0, sizeof(*input));
+
+		input->port_partition_id = port_partition_id;
+		input->port_id = port_id;
+		input->connection_partition_id = connection_partition_id;
+		input->port_info = *port_info;
+		input->port_vtl = port_vtl;
+		input->min_connection_vtl = min_connection_vtl;
+		input->proximity_domain_info =
+			numa_node_to_proximity_domain_info(node);
+		status = hv_do_hypercall(HVCALL_CREATE_PORT, input,
+					NULL) & HV_HYPERCALL_RESULT_MASK;
+		local_irq_restore(flags);
+		if (status == HV_STATUS_SUCCESS)
+			break;
+
+		if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
+			pr_err("%s: %s\n",
+			       __func__, hv_status_to_string(status));
+			ret = -hv_status_to_errno(status);
+			break;
+		}
+		ret = hv_call_deposit_pages(NUMA_NO_NODE,
+				port_partition_id, 1);
+
+	} while (!ret);
+
+	return ret;
+}
+
+int
+hv_call_delete_port(u64 port_partition_id, union hv_port_id port_id)
+{
+	union hv_delete_port input = { 0 };
+	unsigned long flags;
+	int status;
+
+	local_irq_save(flags);
+	input.port_partition_id = port_partition_id;
+	input.port_id = port_id;
+	status = hv_do_fast_hypercall16(HVCALL_DELETE_PORT,
+					input.as_uint64[0],
+					input.as_uint64[1]) &
+			HV_HYPERCALL_RESULT_MASK;
+	local_irq_restore(flags);
+
+	if (status != HV_STATUS_SUCCESS) {
+		pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+		return -hv_status_to_errno(status);
+	}
+
+	return 0;
+}
+
+int
+hv_call_connect_port(u64 port_partition_id, union hv_port_id port_id,
+		     u64 connection_partition_id,
+		     union hv_connection_id connection_id,
+		     struct hv_connection_info *connection_info,
+		     u8 connection_vtl, int node)
+{
+	struct hv_connect_port *input;
+	unsigned long flags;
+	int ret = 0, status;
+
+	do {
+		local_irq_save(flags);
+		input = (struct hv_connect_port *)(*this_cpu_ptr(
+				hyperv_pcpu_input_arg));
+		memset(input, 0, sizeof(*input));
+		input->port_partition_id = port_partition_id;
+		input->port_id = port_id;
+		input->connection_partition_id = connection_partition_id;
+		input->connection_id = connection_id;
+		input->connection_info = *connection_info;
+		input->connection_vtl = connection_vtl;
+		input->proximity_domain_info =
+			numa_node_to_proximity_domain_info(node);
+		status = hv_do_hypercall(HVCALL_CONNECT_PORT, input,
+					NULL) & HV_HYPERCALL_RESULT_MASK;
+
+		local_irq_restore(flags);
+		if (status == HV_STATUS_SUCCESS)
+			break;
+
+		if (status != HV_STATUS_INSUFFICIENT_MEMORY) {
+			pr_err("%s: %s\n",
+			       __func__, hv_status_to_string(status));
+			ret = -hv_status_to_errno(status);
+			break;
+		}
+		ret = hv_call_deposit_pages(NUMA_NO_NODE,
+				connection_partition_id, 1);
+	} while (!ret);
+
+	return ret;
+}
+
+int
+hv_call_disconnect_port(u64 connection_partition_id,
+			union hv_connection_id connection_id)
+{
+	union hv_disconnect_port input = { 0 };
+	unsigned long flags;
+	int status;
+
+	local_irq_save(flags);
+	input.connection_partition_id = connection_partition_id;
+	input.connection_id = connection_id;
+	input.is_doorbell = 1;
+	status = hv_do_fast_hypercall16(HVCALL_DISCONNECT_PORT,
+					input.as_uint64[0],
+					input.as_uint64[1]) &
+			HV_HYPERCALL_RESULT_MASK;
+	local_irq_restore(flags);
+
+	if (status != HV_STATUS_SUCCESS) {
+		pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+		return -hv_status_to_errno(status);
+	}
+
+	return 0;
+}
+
+int
+hv_call_notify_port_ring_empty(u32 sint_index)
+{
+	union hv_notify_port_ring_empty input = { 0 };
+	unsigned long flags;
+	int status;
+
+	local_irq_save(flags);
+	input.sint_index = sint_index;
+	status = hv_do_fast_hypercall8(HVCALL_NOTIFY_PORT_RING_EMPTY,
+					input.as_uint64) &
+			HV_HYPERCALL_RESULT_MASK;
+	local_irq_restore(flags);
+
+	if (status != HV_STATUS_SUCCESS) {
+		pr_err("%s: %s\n", __func__, hv_status_to_string(status));
+		return -hv_status_to_errno(status);
+	}
+
+	return 0;
+}
diff --git a/drivers/hv/mshv.h b/drivers/hv/mshv.h
index 037291a0ad45..e16818e977b9 100644
--- a/drivers/hv/mshv.h
+++ b/drivers/hv/mshv.h
@@ -117,4 +117,16 @@ int hv_call_translate_virtual_address(
 		u64 *gpa,
 		union hv_translate_gva_result *result);
 
+int hv_call_create_port(u64 port_partition_id, union hv_port_id port_id,
+			u64 connection_partition_id, struct hv_port_info *port_info,
+			u8 port_vtl, u8 min_connection_vtl, int node);
+int hv_call_delete_port(u64 port_partition_id, union hv_port_id port_id);
+int hv_call_connect_port(u64 port_partition_id, union hv_port_id port_id,
+			 u64 connection_partition_id,
+			 union hv_connection_id connection_id,
+			 struct hv_connection_info *connection_info,
+			 u8 connection_vtl, int node);
+int hv_call_disconnect_port(u64 connection_partition_id,
+			    union hv_connection_id connection_id);
+int hv_call_notify_port_ring_empty(u32 sint_index);
 #endif /* _MSHV_H */
diff --git a/include/asm-generic/hyperv-tlfs.h b/include/asm-generic/hyperv-tlfs.h
index f70391a3320f..42e0237b0da8 100644
--- a/include/asm-generic/hyperv-tlfs.h
+++ b/include/asm-generic/hyperv-tlfs.h
@@ -159,6 +159,8 @@ struct ms_hyperv_tsc_page {
 #define HVCALL_GET_VP_REGISTERS			0x0050
 #define HVCALL_SET_VP_REGISTERS			0x0051
 #define HVCALL_TRANSLATE_VIRTUAL_ADDRESS	0x0052
+#define HVCALL_DELETE_PORT			0x0058
+#define HVCALL_DISCONNECT_PORT			0x005b
 #define HVCALL_POST_MESSAGE			0x005c
 #define HVCALL_SIGNAL_EVENT			0x005d
 #define HVCALL_POST_DEBUG_DATA			0x0069
@@ -168,7 +170,10 @@ struct ms_hyperv_tsc_page {
 #define HVCALL_MAP_DEVICE_INTERRUPT		0x007c
 #define HVCALL_UNMAP_DEVICE_INTERRUPT		0x007d
 #define HVCALL_RETARGET_INTERRUPT		0x007e
+#define HVCALL_NOTIFY_PORT_RING_EMPTY		0x008b
 #define HVCALL_ASSERT_VIRTUAL_INTERRUPT		0x0094
+#define HVCALL_CREATE_PORT			0x0095
+#define HVCALL_CONNECT_PORT			0x0096
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_SPACE 0x00af
 #define HVCALL_FLUSH_GUEST_PHYSICAL_ADDRESS_LIST 0x00b0
 #define HVCALL_MAP_VP_STATE_PAGE			0x00e1
@@ -949,4 +954,54 @@ struct hv_translate_virtual_address_out {
 	u64 gpa_page;
 } __packed;
 
+struct hv_create_port {
+	u64 port_partition_id;
+	union hv_port_id port_id;
+	u8 port_vtl;
+	u8 min_connection_vtl;
+	u16 padding;
+	u64 connection_partition_id;
+	struct hv_port_info port_info;
+	union hv_proximity_domain_info proximity_domain_info;
+} __packed;
+
+union hv_delete_port {
+	u64 as_uint64[2];
+	struct {
+		u64 port_partition_id;
+		union hv_port_id port_id;
+		u32 reserved;
+	} __packed;
+};
+
+union hv_notify_port_ring_empty {
+	u64 as_uint64;
+	struct {
+		u32 sint_index;
+		u32 reserved;
+	} __packed;
+};
+
+struct hv_connect_port {
+	u64 connection_partition_id;
+	union hv_connection_id connection_id;
+	u8 connection_vtl;
+	u8 rsvdz0;
+	u16 rsvdz1;
+	u64 port_partition_id;
+	union hv_port_id port_id;
+	u32 reserved2;
+	struct hv_connection_info connection_info;
+	union hv_proximity_domain_info proximity_domain_info;
+} __packed;
+
+union hv_disconnect_port {
+	u64 as_uint64[2];
+	struct {
+		u64 connection_partition_id;
+		union hv_connection_id connection_id;
+		u32 is_doorbell: 1;
+		u32 reserved: 31;
+	} __packed;
+};
 #endif
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 2e859d2f9609..76ff26579622 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -750,15 +750,6 @@ struct vmbus_close_msg {
 	struct vmbus_channel_close_channel msg;
 };
 
-/* Define connection identifier type. */
-union hv_connection_id {
-	u32 asu32;
-	struct {
-		u32 id:24;
-		u32 reserved:8;
-	} u;
-};
-
 enum vmbus_device_type {
 	HV_IDE = 0,
 	HV_SCSI,
diff --git a/include/uapi/asm-generic/hyperv-tlfs.h b/include/uapi/asm-generic/hyperv-tlfs.h
index 388c4eb29212..2031115c6cce 100644
--- a/include/uapi/asm-generic/hyperv-tlfs.h
+++ b/include/uapi/asm-generic/hyperv-tlfs.h
@@ -53,6 +53,25 @@ union hv_message_flags {
 	} __packed;
 };
 
+enum hv_port_type {
+	HV_PORT_TYPE_MESSAGE = 1,
+	HV_PORT_TYPE_EVENT   = 2,
+	HV_PORT_TYPE_MONITOR = 3,
+	HV_PORT_TYPE_DOORBELL = 4	// Root Partition only
+};
+
+
+/*
+ * Doorbell connection_info flags.
+ */
+#define HV_DOORBELL_FLAG_TRIGGER_SIZE_MASK  0x00000007
+#define HV_DOORBELL_FLAG_TRIGGER_SIZE_ANY   0x00000000
+#define HV_DOORBELL_FLAG_TRIGGER_SIZE_BYTE  0x00000001
+#define HV_DOORBELL_FLAG_TRIGGER_SIZE_WORD  0x00000002
+#define HV_DOORBELL_FLAG_TRIGGER_SIZE_DWORD 0x00000003
+#define HV_DOORBELL_FLAG_TRIGGER_SIZE_QWORD 0x00000004
+#define HV_DOORBELL_FLAG_TRIGGER_ANY_VALUE  0x80000000
+
 /* Define port identifier type. */
 union hv_port_id {
 	__u32 asu32;
@@ -62,6 +81,63 @@ union hv_port_id {
 	} __packed u;
 };
 
+struct hv_port_info {
+	enum hv_port_type port_type;
+	__u32 padding;
+	union {
+		struct {
+			__u32 target_sint;
+			__u32 target_vp;
+			__u64 rsvdz;
+		} message_port_info;
+		struct {
+			__u32 target_sint;
+			__u32 target_vp;
+			__u16 base_flag_number;
+			__u16 flag_count;
+			__u32 rsvdz;
+		} event_port_info;
+		struct {
+			__u64 monitor_address;
+			__u64 rsvdz;
+		} monitor_port_info;
+		struct {
+			__u32 target_sint;
+			__u32 target_vp;
+			__u64 rsvdz;
+		} doorbell_port_info;
+	};
+};
+
+union hv_connection_id {
+	__u32 asu32;
+	struct {
+		__u32 id:24;
+		__u32 reserved:8;
+	} u;
+};
+
+struct hv_connection_info {
+	enum hv_port_type port_type;
+	__u32 padding;
+	union {
+		struct {
+			__u64 rsvdz;
+		} message_connection_info;
+		struct {
+			__u64 rsvdz;
+		} event_connection_info;
+		struct {
+			__u64 monitor_address;
+		} monitor_connection_info;
+		struct {
+			__u64 gpa;
+			__u64 trigger_value;
+			__u64 flags;
+		} doorbell_connection_info;
+	};
+};
+
 /* Define synthetic interrupt controller message header. */
 struct hv_message_header {
 	__u32 message_type;
-- 
2.25.1