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Date: Fri, 4 Feb 2022 18:34:13 -0800
From: Iouri Tarassov <iourit@...ux.microsoft.com>
To: kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
wei.liu@...nel.org, linux-hyperv@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, spronovo@...rosoft.com,
gregkh@...uxfoundation.org
Subject: [PATCH v2 15/24] drivers: hv: dxgkrnl: IOCTL to get the dxgdevice state LX_DXGETDEVICESTATE
LX_DXGETDEVICESTATE(D3DKMTGetDeviceState)
The IOCTL is used to query the state of the given dxgdevice object (active,
error, etc.). A call to the dxgdevice execution state could be high
frequency. The followin method is used to avoid sending a synchronous VM
bus message to the host for every call:
- When a dxgdevice is created, a pointer to dxgglobal->device_state_counter
is sent to the host
- Every time the device state on the host is changed, the host will send
an asynchronous message to the guest (DXGK_VMBCOMMAND_SETGUESTDATA) and
the guest will increment the device_state_counter counter.
- the dxgdevice object has execution_state_counter counter, which is equal
to dxgglobal->device_state_counte at the time when LX_DXGETDEVICESTATE
was last called.
- if execution_state_counter is different from evice_state_counter, the
dxgk_vmbcommand_getdevicestate VM bus message is sent to the host.
Otherwise, the cached value is returned.
Signed-off-by: Iouri Tarassov <iourit@...ux.microsoft.com>
---
drivers/hv/dxgkrnl/dxgkrnl.h | 11 ++++++
drivers/hv/dxgkrnl/dxgvmbus.c | 66 +++++++++++++++++++++++++++++++++++
drivers/hv/dxgkrnl/ioctl.c | 66 +++++++++++++++++++++++++++++++++++
3 files changed, 143 insertions(+)
diff --git a/drivers/hv/dxgkrnl/dxgkrnl.h b/drivers/hv/dxgkrnl/dxgkrnl.h
index e1c718e7b8eb..892c95a11368 100644
--- a/drivers/hv/dxgkrnl/dxgkrnl.h
+++ b/drivers/hv/dxgkrnl/dxgkrnl.h
@@ -249,12 +249,18 @@ void dxgsyncobject_destroy(struct dxgprocess *process,
void dxgsyncobject_stop(struct dxgsyncobject *syncobj);
void dxgsyncobject_release(struct kref *refcount);
+/*
+ * device_state_counter - incremented every time the execition state of
+ * a DXGDEVICE is changed in the host. Used to optimize access to the
+ * device execution state.
+ */
struct dxgglobal {
struct dxgvmbuschannel channel;
struct delayed_work dwork;
struct hv_device *hdev;
u32 num_adapters;
u32 vmbus_ver; /* Interface version */
+ atomic_t device_state_counter;
struct resource *mem;
u64 mmiospace_base;
u64 mmiospace_size;
@@ -495,6 +501,7 @@ struct dxgdevice {
struct list_head syncobj_list_head;
struct d3dkmthandle handle;
enum d3dkmt_deviceexecution_state execution_state;
+ int execution_state_counter;
u32 handle_valid;
};
@@ -823,6 +830,10 @@ int dxgvmb_send_open_sync_object_nt(struct dxgprocess *process,
struct d3dkmt_opensyncobjectfromnthandle2
*args,
struct dxgsyncobject *syncobj);
+int dxgvmb_send_get_device_state(struct dxgprocess *process,
+ struct dxgadapter *adapter,
+ struct d3dkmt_getdevicestate *args,
+ struct d3dkmt_getdevicestate *__user inargs);
int dxgvmb_send_create_nt_shared_object(struct dxgprocess *process,
struct d3dkmthandle object,
struct d3dkmthandle *shared_handle);
diff --git a/drivers/hv/dxgkrnl/dxgvmbus.c b/drivers/hv/dxgkrnl/dxgvmbus.c
index 8ad290b2b482..b5225756ee6e 100644
--- a/drivers/hv/dxgkrnl/dxgvmbus.c
+++ b/drivers/hv/dxgkrnl/dxgvmbus.c
@@ -275,6 +275,23 @@ static void command_vm_to_host_init1(struct dxgkvmb_command_vm_to_host *command,
command->channel_type = DXGKVMB_VM_TO_HOST;
}
+static void set_guest_data(struct dxgkvmb_command_host_to_vm *packet,
+ u32 packet_length)
+{
+ struct dxgkvmb_command_setguestdata *command = (void *)packet;
+
+ pr_debug("%s: %d %d %p %p", __func__,
+ command->data_type,
+ command->data32,
+ command->guest_pointer,
+ &dxgglobal->device_state_counter);
+ if (command->data_type == SETGUESTDATA_DATATYPE_DWORD &&
+ command->guest_pointer == &dxgglobal->device_state_counter &&
+ command->data32 != 0) {
+ atomic_inc(&dxgglobal->device_state_counter);
+ }
+}
+
static void signal_guest_event(struct dxgkvmb_command_host_to_vm *packet,
u32 packet_length)
{
@@ -305,6 +322,9 @@ static void process_inband_packet(struct dxgvmbuschannel *channel,
pr_debug("global packet %d",
packet->command_type);
switch (packet->command_type) {
+ case DXGK_VMBCOMMAND_SETGUESTDATA:
+ set_guest_data(packet, packet_length);
+ break;
case DXGK_VMBCOMMAND_SIGNALGUESTEVENT:
case DXGK_VMBCOMMAND_SIGNALGUESTEVENTPASSIVE:
signal_guest_event(packet, packet_length);
@@ -1017,6 +1037,7 @@ struct d3dkmthandle dxgvmb_send_create_device(struct dxgadapter *adapter,
command_vgpu_to_host_init2(&command->hdr, DXGK_VMBCOMMAND_CREATEDEVICE,
process->host_handle);
command->flags = args->flags;
+ command->error_code = &dxgglobal->device_state_counter;
ret = dxgvmb_send_sync_msg(msg.channel, msg.hdr, msg.size,
&result, sizeof(result));
@@ -1753,6 +1774,51 @@ int dxgvmb_send_destroy_allocation(struct dxgprocess *process,
return ret;
}
+int dxgvmb_send_get_device_state(struct dxgprocess *process,
+ struct dxgadapter *adapter,
+ struct d3dkmt_getdevicestate *args,
+ struct d3dkmt_getdevicestate *__user output)
+{
+ int ret;
+ struct dxgkvmb_command_getdevicestate *command;
+ struct dxgkvmb_command_getdevicestate_return result = { };
+ 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_GETDEVICESTATE,
+ process->host_handle);
+ command->args = *args;
+
+ ret = dxgvmb_send_sync_msg(msg.channel, msg.hdr, msg.size,
+ &result, sizeof(result));
+ if (ret < 0)
+ goto cleanup;
+
+ ret = ntstatus2int(result.status);
+ if (ret < 0)
+ goto cleanup;
+
+ ret = copy_to_user(output, &result.args, sizeof(result.args));
+ if (ret) {
+ pr_err("%s failed to copy output args", __func__);
+ ret = -EINVAL;
+ }
+
+ if (args->state_type == _D3DKMT_DEVICESTATE_EXECUTION)
+ args->execution_state = result.args.execution_state;
+
+cleanup:
+ free_message(&msg, process);
+ if (ret)
+ pr_debug("err: %s %d", __func__, ret);
+ return ret;
+}
+
int dxgvmb_send_open_resource(struct dxgprocess *process,
struct dxgadapter *adapter,
struct d3dkmthandle device,
diff --git a/drivers/hv/dxgkrnl/ioctl.c b/drivers/hv/dxgkrnl/ioctl.c
index 71ba7b75c60f..bb6eab08898f 100644
--- a/drivers/hv/dxgkrnl/ioctl.c
+++ b/drivers/hv/dxgkrnl/ioctl.c
@@ -3180,6 +3180,70 @@ dxgk_wait_sync_object_gpu(struct dxgprocess *process, void *__user inargs)
return ret;
}
+static int
+dxgk_get_device_state(struct dxgprocess *process, void *__user inargs)
+{
+ int ret;
+ struct d3dkmt_getdevicestate args;
+ struct dxgdevice *device = NULL;
+ struct dxgadapter *adapter = NULL;
+ int global_device_state_counter = 0;
+
+ ret = copy_from_user(&args, inargs, sizeof(args));
+ if (ret) {
+ pr_err("%s failed to copy input args", __func__);
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ device = dxgprocess_device_by_handle(process, args.device);
+ if (device == NULL) {
+ ret = -EINVAL;
+ goto cleanup;
+ }
+
+ adapter = device->adapter;
+ ret = dxgadapter_acquire_lock_shared(adapter);
+ if (ret < 0) {
+ adapter = NULL;
+ goto cleanup;
+ }
+
+ if (args.state_type == _D3DKMT_DEVICESTATE_EXECUTION) {
+ global_device_state_counter =
+ atomic_read(&dxgglobal->device_state_counter);
+ if (device->execution_state_counter ==
+ global_device_state_counter) {
+ args.execution_state = device->execution_state;
+ ret = copy_to_user(inargs, &args, sizeof(args));
+ if (ret) {
+ pr_err("%s failed to copy args to user",
+ __func__);
+ ret = -EINVAL;
+ }
+ goto cleanup;
+ }
+ }
+
+ ret = dxgvmb_send_get_device_state(process, adapter, &args, inargs);
+
+ if (ret == 0 && args.state_type == _D3DKMT_DEVICESTATE_EXECUTION) {
+ device->execution_state = args.execution_state;
+ device->execution_state_counter = global_device_state_counter;
+ }
+
+cleanup:
+
+ if (adapter)
+ dxgadapter_release_lock_shared(adapter);
+ if (device)
+ kref_put(&device->device_kref, dxgdevice_release);
+ if (ret < 0)
+ pr_err("%s failed %x", __func__, ret);
+
+ return ret;
+}
+
static int
dxgsharedsyncobj_get_host_nt_handle(struct dxgsharedsyncobject *syncobj,
struct dxgprocess *process,
@@ -3921,6 +3985,8 @@ void init_ioctls(void)
LX_DXCREATEPAGINGQUEUE);
SET_IOCTL(/*0x9 */ dxgk_query_adapter_info,
LX_DXQUERYADAPTERINFO);
+ SET_IOCTL(/*0xe */ dxgk_get_device_state,
+ LX_DXGETDEVICESTATE);
SET_IOCTL(/*0xf */ dxgk_submit_command,
LX_DXSUBMITCOMMAND);
SET_IOCTL(/*0x10 */ dxgk_create_sync_object,
--
2.35.1
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