drivers: hv: dxgkrnl: Implement D3DDKMTIsFeatureEnabled API

D3DKMTIsFeatureEnabled is used to query if a particular feature is
supported by the given adapter.

Signed-off-by: Iouri Tarassov <iourit@linux.microsoft.com>

drivers/hv/dxgkrnl/dxgkrnl.h

@@ -998,6 +998,8 @@ int dxgvmb_send_share_object_with_host(struct dxgprocess *process,
 int dxgvmb_send_invalidate_cache(struct dxgprocess *process,
 				struct dxgadapter *adapter,
 				struct d3dkmt_invalidatecache *args);
+int dxgvmb_send_is_feature_enabled(struct dxgadapter *adapter,
+				   struct d3dkmt_isfeatureenabled *args);
 
 void signal_host_cpu_event(struct dxghostevent *eventhdr);
 int ntstatus2int(struct ntstatus status);

drivers/hv/dxgkrnl/dxgvmbus.c

@@ -135,15 +135,16 @@ static int init_message_res(struct dxgvmbusmsgres *msg,
 	if (use_ext_header) {
 		msg->msg = (char *)&msg->hdr[1];
 		msg->hdr->command_offset = sizeof(msg->hdr[0]);
-		msg->hdr->vgpu_luid = adapter->host_vgpu_luid;
+		if (adapter)
+			msg->hdr->vgpu_luid = adapter->host_vgpu_luid;
 	} else {
 		msg->msg = (char *)msg->hdr;
 	}
 	msg->res = (char *)msg->hdr + msg->size;
-	if (dxgglobal->async_msg_enabled)
+	if (adapter && !dxgglobal->async_msg_enabled)
-		msg->channel = &dxgglobal->channel;
-	else
 		msg->channel = &adapter->channel;
+	else
+		msg->channel = &dxgglobal->channel;
 	return 0;
 }
 
@@ -2057,6 +2058,55 @@ cleanup:
 	return ret;
 }
 
+int dxgvmb_send_is_feature_enabled(struct dxgadapter *adapter,
+				   struct d3dkmt_isfeatureenabled *args)
+{
+	int ret;
+	struct dxgkvmb_command_isfeatureenabled_return *result;
+	struct dxgvmbusmsgres msg = {.hdr = NULL};
+	int res_size = sizeof(*result);
+
+	if (adapter) {
+		struct dxgkvmb_command_isfeatureenabled *command;
+
+		ret = init_message_res(&msg, adapter, sizeof(*command),
+					res_size);
+		if (ret)
+			goto cleanup;
+		command = (void *)msg.msg;
+		command->feature_id = args->feature_id;
+		result = msg.res;
+		command_vgpu_to_host_init1(&command->hdr,
+					   DXGK_VMBCOMMAND_ISFEATUREENABLED);
+	} else {
+		struct dxgkvmb_command_isfeatureenabled_gbl *command;
+
+		ret = init_message_res(&msg, adapter, sizeof(*command),
+					res_size);
+		if (ret)
+			goto cleanup;
+		command = (void *)msg.msg;
+		command->feature_id = args->feature_id;
+		result = msg.res;
+		command_vm_to_host_init1(&command->hdr,
+				DXGK_VMBCOMMAND_ISFEATUREENABLED_GLOBAL);
+	}
+	ret = dxgvmb_send_sync_msg(msg.channel, msg.hdr, msg.size,
+				   result, res_size);
+	if (ret == 0) {
+		ret = ntstatus2int(result->status);
+		if (ret == 0)
+			args->result = result->result;
+		goto cleanup;
+	}
+
+cleanup:
+	free_message((struct dxgvmbusmsg *)&msg);
+	if (ret)
+		DXG_TRACE("err: %d", ret);
+	return ret;
+}
+
 int dxgvmb_send_query_alloc_residency(struct dxgprocess *process,
 				      struct dxgadapter *adapter,
 				      struct d3dkmt_queryallocationresidency

drivers/hv/dxgkrnl/dxgvmbus.h

@@ -48,6 +48,7 @@ enum dxgkvmb_commandtype_global {
 	DXGK_VMBCOMMAND_SETIOSPACEREGION	= 1010,
 	DXGK_VMBCOMMAND_COMPLETETRANSACTION	= 1011,
 	DXGK_VMBCOMMAND_SHAREOBJECTWITHHOST	= 1021,
+	DXGK_VMBCOMMAND_ISFEATUREENABLED_GLOBAL	= 1022,
 	DXGK_VMBCOMMAND_INVALID_VM_TO_HOST
 };
 
@@ -126,6 +127,7 @@ enum dxgkvmb_commandtype {
 	DXGK_VMBCOMMAND_LOGEVENT		= 65,
 	DXGK_VMBCOMMAND_SETEXISTINGSYSMEMPAGES	= 66,
 	DXGK_VMBCOMMAND_INVALIDATECACHE		= 67,
+	DXGK_VMBCOMMAND_ISFEATUREENABLED	= 68,
 	DXGK_VMBCOMMAND_INVALID
 };
 
@@ -871,6 +873,35 @@ struct dxgkvmb_command_shareobjectwithhost_return {
 	u64		vail_nt_handle;
 };
 
+struct dxgk_feature_desc {
+	u16 min_supported_version;
+	u16 max_supported_version;
+	struct {
+		u16 supported		: 1;
+		u16 virtualization_mode : 3;
+		u16 global 		: 1;
+		u16 driver_feature	: 1;
+		u16 internal		: 1;
+		u16 reserved		: 9;
+	};
+};
+
+struct  dxgkvmb_command_isfeatureenabled {
+	struct dxgkvmb_command_vgpu_to_host	hdr;
+	enum dxgk_feature_id			feature_id;
+};
+
+struct  dxgkvmb_command_isfeatureenabled_gbl {
+	struct dxgkvmb_command_vm_to_host	hdr;
+	enum dxgk_feature_id			feature_id;
+};
+
+struct dxgkvmb_command_isfeatureenabled_return {
+	struct ntstatus				status;
+	struct dxgk_feature_desc		descriptor;
+	struct dxgk_isfeatureenabled_result	result;
+};
+
 int
 dxgvmb_send_sync_msg(struct dxgvmbuschannel *channel,
 		     void *command, u32 command_size, void *result,

drivers/hv/dxgkrnl/ioctl.c

@@ -5318,6 +5318,51 @@ cleanup:
 	return ret;
 }
 
+static int
+dxgkio_is_feature_enabled(struct dxgprocess *process, void *__user inargs)
+{
+	struct d3dkmt_isfeatureenabled args;
+	struct dxgadapter *adapter = NULL;
+	struct dxgglobal *dxgglobal = dxggbl();
+	struct d3dkmt_isfeatureenabled *__user uargs = inargs;
+	int ret;
+
+	ret = copy_from_user(&args, inargs, sizeof(args));
+	if (ret) {
+		DXG_ERR("failed to copy input args");
+		ret = -EFAULT;
+		goto cleanup;
+	}
+
+	adapter = dxgprocess_adapter_by_handle(process, args.adapter);
+	if (adapter == NULL) {
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	if (adapter) {
+		ret = dxgadapter_acquire_lock_shared(adapter);
+		if (ret < 0)
+			goto cleanup;
+	}
+
+	ret = dxgvmb_send_is_feature_enabled(adapter, &args);
+	if (ret)
+		goto cleanup;
+
+	ret = copy_to_user(&uargs->result, &args.result, sizeof(args.result));
+
+cleanup:
+
+	if (adapter) {
+		dxgadapter_release_lock_shared(adapter);
+		kref_put(&adapter->adapter_kref, dxgadapter_release);
+	}
+
+	DXG_TRACE_IOCTL_END(ret);
+	return ret;
+}
+
 static struct ioctl_desc ioctls[] = {
 /* 0x00 */	{},
 /* 0x01 */	{dxgkio_open_adapter_from_luid, LX_DXOPENADAPTERFROMLUID},
@@ -5406,6 +5451,7 @@ static struct ioctl_desc ioctls[] = {
 /* 0x47 */	{dxgkio_open_syncobj_from_syncfile,
 		 LX_DXOPENSYNCOBJECTFROMSYNCFILE},
 /* 0x48 */	{dxgkio_enum_processes, LX_DXENUMPROCESSES},
+/* 0x49 */	{dxgkio_is_feature_enabled, LX_ISFEATUREENABLED},
 };
 
 /*

include/uapi/misc/d3dkmthk.h

@@ -1580,7 +1580,7 @@ struct d3dkmt_opensyncobjectfromsyncfile {
 	__u64			fence_value_gpu_va;	/* out */
 };
 
- struct d3dkmt_enumprocesses {
+struct d3dkmt_enumprocesses {
 	struct winluid 		adapter_luid;
 #ifdef __KERNEL__
 	__u32			*buffer;
@@ -1590,6 +1590,33 @@ struct d3dkmt_opensyncobjectfromsyncfile {
 	__u64			buffer_count;
 };
 
+enum dxgk_feature_id {
+	_DXGK_FEATURE_HWSCH				= 0,
+	_DXGK_FEATURE_PAGE_BASED_MEMORY_MANAGER		= 32,
+	_DXGK_FEATURE_KERNEL_MODE_TESTING		= 33,
+	_DXGK_FEATURE_MAX
+};
+
+struct dxgk_isfeatureenabled_result {
+	__u16	version;
+	union {
+		struct {
+			__u16 enabled			:  1;
+			__u16 known_feature		:  1;
+			__u16 supported_by_driver	:  1;
+			__u16 supported_on_config	:  1;
+			__u16 reserved			: 12;
+		};
+		__u16 value;
+	};
+};
+
+struct d3dkmt_isfeatureenabled {
+	struct d3dkmthandle			adapter;
+	enum dxgk_feature_id			feature_id;
+	struct dxgk_isfeatureenabled_result	result;
+};
+
 struct d3dkmt_invalidatecache {
 	struct d3dkmthandle	device;
 	struct d3dkmthandle	allocation;
@@ -1730,5 +1757,7 @@ struct d3dkmt_invalidatecache {
 	_IOWR(0x47, 0x47, struct d3dkmt_opensyncobjectfromsyncfile)
 #define LX_DXENUMPROCESSES	\
 	_IOWR(0x47, 0x48, struct d3dkmt_enumprocesses)
+#define LX_ISFEATUREENABLED	\
+	_IOWR(0x47, 0x49, struct d3dkmt_isfeatureenabled)
 
 #endif /* _D3DKMTHK_H */