drivers: hv: dxgkrnl: Flush heap transitions

Implement the ioctl to flush heap transitions
(LX_DXFLUSHHEAPTRANSITIONS).

The ioctl is used to ensure that the video memory manager on the host
flushes all internal operations.

Signed-off-by: Iouri Tarassov <iourit@linux.microsoft.com>
[kms: forward port to 6.6 from 6.1. No code changes made.]
Signed-off-by: Kelsey Steele <kelseysteele@microsoft.com>

Author: Iouri Tarassov

drivers/hv/dxgkrnl/dxgadapter.c

@@ -942,7 +942,7 @@ else
 	if (alloc->priv_drv_data)
 		vfree(alloc->priv_drv_data);
 	if (alloc->cpu_address_mapped)
-		pr_err("Alloc IO space is mapped: %p", alloc);
+		DXG_ERR("Alloc IO space is mapped: %p", alloc);
 	kfree(alloc);
 }
 

drivers/hv/dxgkrnl/dxgkrnl.h

@@ -882,6 +882,9 @@ int dxgvmb_send_query_adapter_info(struct dxgprocess *process,
 int dxgvmb_send_submit_command_hwqueue(struct dxgprocess *process,
 				       struct dxgadapter *adapter,
 				       struct d3dkmt_submitcommandtohwqueue *a);
+int dxgvmb_send_flush_heap_transitions(struct dxgprocess *process,
+				       struct dxgadapter *adapter,
+				       struct d3dkmt_flushheaptransitions *arg);
 int dxgvmb_send_open_sync_object_nt(struct dxgprocess *process,
 				    struct dxgvmbuschannel *channel,
 				    struct d3dkmt_opensyncobjectfromnthandle2

drivers/hv/dxgkrnl/dxgvmbus.c

@@ -1829,6 +1829,29 @@ int dxgvmb_send_destroy_allocation(struct dxgprocess *process,
 	return ret;
 }
 
+int dxgvmb_send_flush_heap_transitions(struct dxgprocess *process,
+				       struct dxgadapter *adapter,
+				       struct d3dkmt_flushheaptransitions *args)
+{
+	struct dxgkvmb_command_flushheaptransitions *command;
+	int ret;
+	struct dxgvmbusmsg msg = {.hdr = NULL};
+
+	ret = init_message(&msg, adapter, process, sizeof(*command));
+	if (ret)
+		goto cleanup;
+	command = (void *)msg.msg;
+	command_vgpu_to_host_init2(&command->hdr,
+				   DXGK_VMBCOMMAND_FLUSHHEAPTRANSITIONS,
+				   process->host_handle);
+	ret = dxgvmb_send_sync_msg_ntstatus(msg.channel, msg.hdr, msg.size);
+cleanup:
+	free_message(&msg, process);
+	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

@@ -367,6 +367,11 @@ struct dxgkvmb_command_submitcommandtohwqueue {
 	/* PrivateDriverData */
 };
 
+/* Returns  ntstatus */
+struct dxgkvmb_command_flushheaptransitions {
+	struct dxgkvmb_command_vgpu_to_host hdr;
+};
+
 struct dxgkvmb_command_createallocation_allocinfo {
 	u32				flags;
 	u32				priv_drv_data_size;

drivers/hv/dxgkrnl/ioctl.c

@@ -3500,6 +3500,53 @@ dxgkio_change_vidmem_reservation(struct dxgprocess *process, void *__user inargs
 	return ret;
 }
 
+static int
+dxgkio_flush_heap_transitions(struct dxgprocess *process, void *__user inargs)
+{
+	struct d3dkmt_flushheaptransitions args;
+	int ret;
+	struct dxgadapter *adapter = NULL;
+	bool adapter_locked = false;
+
+	ret = copy_from_user(&args, inargs, sizeof(args));
+	if (ret) {
+		DXG_ERR("failed to copy input args");
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	adapter = dxgprocess_adapter_by_handle(process, args.adapter);
+	if (adapter == NULL) {
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	ret = dxgadapter_acquire_lock_shared(adapter);
+	if (ret < 0) {
+		adapter = NULL;
+		goto cleanup;
+	}
+	adapter_locked = true;
+
+	args.adapter = adapter->host_handle;
+	ret = dxgvmb_send_flush_heap_transitions(process, adapter, &args);
+	if (ret < 0)
+		goto cleanup;
+	ret = copy_to_user(inargs, &args, sizeof(args));
+	if (ret) {
+		DXG_ERR("failed to copy output args");
+		ret = -EINVAL;
+	}
+
+cleanup:
+
+	if (adapter_locked)
+		dxgadapter_release_lock_shared(adapter);
+	if (adapter)
+		kref_put(&adapter->adapter_kref, dxgadapter_release);
+	return ret;
+}
+
 static int
 dxgkio_get_device_state(struct dxgprocess *process, void *__user inargs)
 {
@@ -4262,7 +4309,7 @@ static struct ioctl_desc ioctls[] = {
 /* 0x1c */	{dxgkio_destroy_paging_queue, LX_DXDESTROYPAGINGQUEUE},
 /* 0x1d */	{dxgkio_destroy_sync_object, LX_DXDESTROYSYNCHRONIZATIONOBJECT},
 /* 0x1e */	{},
-/* 0x1f */	{},
+/* 0x1f */	{dxgkio_flush_heap_transitions, LX_DXFLUSHHEAPTRANSITIONS},
 /* 0x20 */	{},
 /* 0x21 */	{},
 /* 0x22 */	{},

include/uapi/misc/d3dkmthk.h

@@ -936,6 +936,10 @@ struct d3dkmt_queryadapterinfo {
 	__u32				private_data_size;
 };
 
+struct d3dkmt_flushheaptransitions {
+	struct d3dkmthandle	adapter;
+};
+
 struct d3dddi_openallocationinfo2 {
 	struct d3dkmthandle	allocation;
 #ifdef __KERNEL__
@@ -1228,6 +1232,8 @@ struct d3dkmt_shareobjectwithhost {
 	_IOWR(0x47, 0x19, struct d3dkmt_destroydevice)
 #define LX_DXDESTROYSYNCHRONIZATIONOBJECT \
 	_IOWR(0x47, 0x1d, struct d3dkmt_destroysynchronizationobject)
+#define LX_DXFLUSHHEAPTRANSITIONS	\
+	_IOWR(0x47, 0x1f, struct d3dkmt_flushheaptransitions)
 #define LX_DXLOCK2			\
 	_IOWR(0x47, 0x25, struct d3dkmt_lock2)
 #define LX_DXQUERYALLOCATIONRESIDENCY	\