drm/nouveau/fifo/r535: initial support

- Adds support for allocating CHANNEL_GPFIFO classes from RM.

Signed-off-by: Ben Skeggs <[email protected]>
Signed-off-by: Dave Airlie <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Ben Skeggs

drivers/gpu/drm/nouveau/include/nvkm/engine/fifo.h

@@ -4,6 +4,7 @@
 #include <core/engine.h>
 #include <core/object.h>
 #include <core/event.h>
+#include <subdev/gsp.h>
 struct nvkm_fault_data;
 
 #define NVKM_FIFO_ENGN_NR 16
@@ -35,6 +36,14 @@ struct nvkm_chan {
 	atomic_t blocked;
 	atomic_t errored;
 
+	struct {
+		struct nvkm_gsp_object object;
+		struct {
+			dma_addr_t addr;
+			void *ptr;
+		} mthdbuf;
+	} rm;
+
 	struct list_head cctxs;
 	struct list_head head;
 };
@@ -71,6 +80,10 @@ struct nvkm_fifo {
 		struct list_head list;
 	} userd;
 
+	struct {
+		u32 mthdbuf_size;
+	} rm;
+
 	spinlock_t lock;
 	struct mutex mutex;
 };

drivers/gpu/drm/nouveau/include/nvrm/535.54.03/common/sdk/nvidia/inc/alloc/alloc_channel.h

@@ -0,0 +1,161 @@
+#ifndef __src_common_sdk_nvidia_inc_alloc_alloc_channel_h__
+#define __src_common_sdk_nvidia_inc_alloc_alloc_channel_h__
+#include <nvrm/535.54.03/common/sdk/nvidia/inc/nvlimits.h>
+
+/* Excerpt of RM headers from https://github.com/NVIDIA/open-gpu-kernel-modules/tree/535.54.03 */
+
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+typedef struct NV_MEMORY_DESC_PARAMS {
+    NV_DECLARE_ALIGNED(NvU64 base, 8);
+    NV_DECLARE_ALIGNED(NvU64 size, 8);
+    NvU32 addressSpace;
+    NvU32 cacheAttrib;
+} NV_MEMORY_DESC_PARAMS;
+
+#define NVOS04_FLAGS_CHANNEL_TYPE                                  1:0
+#define NVOS04_FLAGS_CHANNEL_TYPE_PHYSICAL                         0x00000000
+#define NVOS04_FLAGS_CHANNEL_TYPE_VIRTUAL                          0x00000001  // OBSOLETE
+#define NVOS04_FLAGS_CHANNEL_TYPE_PHYSICAL_FOR_VIRTUAL             0x00000002  // OBSOLETE
+
+#define NVOS04_FLAGS_VPR                                           2:2
+#define NVOS04_FLAGS_VPR_FALSE                                     0x00000000
+#define NVOS04_FLAGS_VPR_TRUE                                      0x00000001
+
+#define NVOS04_FLAGS_CC_SECURE                                     2:2
+#define NVOS04_FLAGS_CC_SECURE_FALSE                               0x00000000
+#define NVOS04_FLAGS_CC_SECURE_TRUE                                0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_SKIP_MAP_REFCOUNTING                  3:3
+#define NVOS04_FLAGS_CHANNEL_SKIP_MAP_REFCOUNTING_FALSE            0x00000000
+#define NVOS04_FLAGS_CHANNEL_SKIP_MAP_REFCOUNTING_TRUE             0x00000001
+
+#define NVOS04_FLAGS_GROUP_CHANNEL_RUNQUEUE                       4:4
+#define NVOS04_FLAGS_GROUP_CHANNEL_RUNQUEUE_DEFAULT               0x00000000
+#define NVOS04_FLAGS_GROUP_CHANNEL_RUNQUEUE_ONE                   0x00000001
+
+#define NVOS04_FLAGS_PRIVILEGED_CHANNEL                           5:5
+#define NVOS04_FLAGS_PRIVILEGED_CHANNEL_FALSE                     0x00000000
+#define NVOS04_FLAGS_PRIVILEGED_CHANNEL_TRUE                      0x00000001
+
+#define NVOS04_FLAGS_DELAY_CHANNEL_SCHEDULING                     6:6
+#define NVOS04_FLAGS_DELAY_CHANNEL_SCHEDULING_FALSE               0x00000000
+#define NVOS04_FLAGS_DELAY_CHANNEL_SCHEDULING_TRUE                0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_DENY_PHYSICAL_MODE_CE                7:7
+#define NVOS04_FLAGS_CHANNEL_DENY_PHYSICAL_MODE_CE_FALSE          0x00000000
+#define NVOS04_FLAGS_CHANNEL_DENY_PHYSICAL_MODE_CE_TRUE           0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_VALUE                    10:8
+
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_FIXED                    11:11
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_FIXED_FALSE              0x00000000
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_FIXED_TRUE               0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_PAGE_VALUE               20:12
+
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_PAGE_FIXED               21:21
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_PAGE_FIXED_FALSE         0x00000000
+#define NVOS04_FLAGS_CHANNEL_USERD_INDEX_PAGE_FIXED_TRUE          0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_DENY_AUTH_LEVEL_PRIV                 22:22
+#define NVOS04_FLAGS_CHANNEL_DENY_AUTH_LEVEL_PRIV_FALSE           0x00000000
+#define NVOS04_FLAGS_CHANNEL_DENY_AUTH_LEVEL_PRIV_TRUE            0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_SKIP_SCRUBBER                        23:23
+#define NVOS04_FLAGS_CHANNEL_SKIP_SCRUBBER_FALSE                  0x00000000
+#define NVOS04_FLAGS_CHANNEL_SKIP_SCRUBBER_TRUE                   0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_CLIENT_MAP_FIFO                      24:24
+#define NVOS04_FLAGS_CHANNEL_CLIENT_MAP_FIFO_FALSE                0x00000000
+#define NVOS04_FLAGS_CHANNEL_CLIENT_MAP_FIFO_TRUE                 0x00000001
+
+#define NVOS04_FLAGS_SET_EVICT_LAST_CE_PREFETCH_CHANNEL           25:25
+#define NVOS04_FLAGS_SET_EVICT_LAST_CE_PREFETCH_CHANNEL_FALSE     0x00000000
+#define NVOS04_FLAGS_SET_EVICT_LAST_CE_PREFETCH_CHANNEL_TRUE      0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_VGPU_PLUGIN_CONTEXT                  26:26
+#define NVOS04_FLAGS_CHANNEL_VGPU_PLUGIN_CONTEXT_FALSE            0x00000000
+#define NVOS04_FLAGS_CHANNEL_VGPU_PLUGIN_CONTEXT_TRUE             0x00000001
+
+#define NVOS04_FLAGS_CHANNEL_PBDMA_ACQUIRE_TIMEOUT                 27:27
+#define NVOS04_FLAGS_CHANNEL_PBDMA_ACQUIRE_TIMEOUT_FALSE           0x00000000
+#define NVOS04_FLAGS_CHANNEL_PBDMA_ACQUIRE_TIMEOUT_TRUE            0x00000001
+
+#define NVOS04_FLAGS_GROUP_CHANNEL_THREAD                          29:28
+#define NVOS04_FLAGS_GROUP_CHANNEL_THREAD_DEFAULT                  0x00000000
+#define NVOS04_FLAGS_GROUP_CHANNEL_THREAD_ONE                      0x00000001
+#define NVOS04_FLAGS_GROUP_CHANNEL_THREAD_TWO                      0x00000002
+
+#define NVOS04_FLAGS_MAP_CHANNEL                                   30:30
+#define NVOS04_FLAGS_MAP_CHANNEL_FALSE                             0x00000000
+#define NVOS04_FLAGS_MAP_CHANNEL_TRUE                              0x00000001
+
+#define NVOS04_FLAGS_SKIP_CTXBUFFER_ALLOC                          31:31
+#define NVOS04_FLAGS_SKIP_CTXBUFFER_ALLOC_FALSE                    0x00000000
+#define NVOS04_FLAGS_SKIP_CTXBUFFER_ALLOC_TRUE                     0x00000001
+
+typedef struct NV_CHANNEL_ALLOC_PARAMS {
+
+    NvHandle hObjectError; // error context DMA
+    NvHandle hObjectBuffer; // no longer used
+    NV_DECLARE_ALIGNED(NvU64 gpFifoOffset, 8);    // offset to beginning of GP FIFO
+    NvU32    gpFifoEntries;    // number of GP FIFO entries
+
+    NvU32    flags;
+
+
+    NvHandle hContextShare; // context share handle
+    NvHandle hVASpace; // VASpace for the channel
+
+    // handle to UserD memory object for channel, ignored if hUserdMemory[0]=0
+    NvHandle hUserdMemory[NV_MAX_SUBDEVICES];
+
+    // offset to beginning of UserD within hUserdMemory[x]
+    NV_DECLARE_ALIGNED(NvU64 userdOffset[NV_MAX_SUBDEVICES], 8);
+
+    // engine type(NV2080_ENGINE_TYPE_*) with which this channel is associated
+    NvU32    engineType;
+    // Channel identifier that is unique for the duration of a RM session
+    NvU32    cid;
+    // One-hot encoded bitmask to match SET_SUBDEVICE_MASK methods
+    NvU32    subDeviceId;
+    NvHandle hObjectEccError; // ECC error context DMA
+
+    NV_DECLARE_ALIGNED(NV_MEMORY_DESC_PARAMS instanceMem, 8);
+    NV_DECLARE_ALIGNED(NV_MEMORY_DESC_PARAMS userdMem, 8);
+    NV_DECLARE_ALIGNED(NV_MEMORY_DESC_PARAMS ramfcMem, 8);
+    NV_DECLARE_ALIGNED(NV_MEMORY_DESC_PARAMS mthdbufMem, 8);
+
+    NvHandle hPhysChannelGroup;              // reserved
+    NvU32    internalFlags;                 // reserved
+    NV_DECLARE_ALIGNED(NV_MEMORY_DESC_PARAMS errorNotifierMem, 8); // reserved
+    NV_DECLARE_ALIGNED(NV_MEMORY_DESC_PARAMS eccErrorNotifierMem, 8); // reserved
+    NvU32    ProcessID;                 // reserved
+    NvU32    SubProcessID;                 // reserved
+} NV_CHANNEL_ALLOC_PARAMS;
+
+typedef NV_CHANNEL_ALLOC_PARAMS NV_CHANNELGPFIFO_ALLOCATION_PARAMETERS;
+
+#endif

drivers/gpu/drm/nouveau/include/nvrm/535.54.03/common/sdk/nvidia/inc/class/cl2080_notification.h

@@ -30,6 +30,26 @@
 
 #define NV2080_NOTIFIERS_DP_IRQ                                    (7)
 
+#define NV2080_ENGINE_TYPE_GRAPHICS                   (0x00000001)
+#define NV2080_ENGINE_TYPE_GR0                        NV2080_ENGINE_TYPE_GRAPHICS
+
+#define NV2080_ENGINE_TYPE_COPY0                      (0x00000009)
+
+#define NV2080_ENGINE_TYPE_BSP                        (0x00000013)
+#define NV2080_ENGINE_TYPE_NVDEC0                     NV2080_ENGINE_TYPE_BSP
+
+#define NV2080_ENGINE_TYPE_MSENC                      (0x0000001b)
+#define NV2080_ENGINE_TYPE_NVENC0                      NV2080_ENGINE_TYPE_MSENC  /* Mutually exclusive alias */
+
+#define NV2080_ENGINE_TYPE_SW                         (0x00000022)
+
+#define NV2080_ENGINE_TYPE_SEC2                       (0x00000026)
+
+#define NV2080_ENGINE_TYPE_NVJPG                      (0x0000002b)
+#define NV2080_ENGINE_TYPE_NVJPEG0                     NV2080_ENGINE_TYPE_NVJPG
+
+#define NV2080_ENGINE_TYPE_OFA                        (0x00000033)
+
 typedef struct {
     NvU32 plugDisplayMask;
     NvU32 unplugDisplayMask;

drivers/gpu/drm/nouveau/include/nvrm/535.54.03/common/sdk/nvidia/inc/ctrl/ctrl2080/ctrl2080ce.h

@@ -0,0 +1,35 @@
+#ifndef __src_common_sdk_nvidia_inc_ctrl_ctrl2080_ctrl2080ce_h__
+#define __src_common_sdk_nvidia_inc_ctrl_ctrl2080_ctrl2080ce_h__
+
+/* Excerpt of RM headers from https://github.com/NVIDIA/open-gpu-kernel-modules/tree/535.54.03 */
+
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2014-2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+typedef struct NV2080_CTRL_CE_GET_FAULT_METHOD_BUFFER_SIZE_PARAMS {
+    NvU32 size;
+} NV2080_CTRL_CE_GET_FAULT_METHOD_BUFFER_SIZE_PARAMS;
+
+#define NV2080_CTRL_CMD_CE_GET_FAULT_METHOD_BUFFER_SIZE (0x20802a08) /* finn: Evaluated from "(FINN_NV20_SUBDEVICE_0_CE_INTERFACE_ID << 8) | NV2080_CTRL_CE_GET_FAULT_METHOD_BUFFER_SIZE_PARAMS_MESSAGE_ID" */
+
+#endif

drivers/gpu/drm/nouveau/include/nvrm/535.54.03/common/sdk/nvidia/inc/ctrl/ctrl2080/ctrl2080fifo.h

@@ -0,0 +1,52 @@
+#ifndef __src_common_sdk_nvidia_inc_ctrl_ctrl2080_ctrl2080fifo_h__
+#define __src_common_sdk_nvidia_inc_ctrl_ctrl2080_ctrl2080fifo_h__
+
+/* Excerpt of RM headers from https://github.com/NVIDIA/open-gpu-kernel-modules/tree/535.54.03 */
+
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2006-2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: MIT
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#define NV2080_CTRL_CMD_FIFO_GET_DEVICE_INFO_TABLE                 (0x20801112) /* finn: Evaluated from "(FINN_NV20_SUBDEVICE_0_FIFO_INTERFACE_ID << 8) | NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_PARAMS_MESSAGE_ID" */
+
+#define NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_MAX_ENTRIES         32
+#define NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_DATA_TYPES   16
+#define NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_MAX_PBDMA    2
+#define NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_MAX_NAME_LEN 16
+
+typedef struct NV2080_CTRL_FIFO_DEVICE_ENTRY {
+    NvU32 engineData[NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_DATA_TYPES];
+    NvU32 pbdmaIds[NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_MAX_PBDMA];
+    NvU32 pbdmaFaultIds[NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_MAX_PBDMA];
+    NvU32 numPbdmas;
+    char  engineName[NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_ENGINE_MAX_NAME_LEN];
+} NV2080_CTRL_FIFO_DEVICE_ENTRY;
+
+typedef struct NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_PARAMS {
+    NvU32                         baseIndex;
+    NvU32                         numEntries;
+    NvBool                        bMore;
+    // C form: NV2080_CTRL_FIFO_DEVICE_ENTRY entries[NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_MAX_ENTRIES];
+    NV2080_CTRL_FIFO_DEVICE_ENTRY entries[NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_MAX_ENTRIES];
+} NV2080_CTRL_FIFO_GET_DEVICE_INFO_TABLE_PARAMS;
+
+#endif

drivers/gpu/drm/nouveau/include/nvrm/535.54.03/common/sdk/nvidia/inc/ctrl/ctrla06f/ctrla06fgpfifo.h

@@ -0,0 +1,42 @@
+#ifndef __src_common_sdk_nvidia_inc_ctrl_ctrla06f_ctrla06fgpfifo_h__
+#define __src_common_sdk_nvidia_inc_ctrl_ctrla06f_ctrla06fgpfifo_h__
+
+/* Excerpt of RM headers from https://github.com/NVIDIA/open-gpu-kernel-modules/tree/535.54.03 */
+
+/*
+ * SPDX-FileCopyrightText: Copyright (c) 2007-2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
+ * SPDX-License-Identifier: MIT
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#define NVA06F_CTRL_CMD_GPFIFO_SCHEDULE (0xa06f0103) /* finn: Evaluated from "(FINN_KEPLER_CHANNEL_GPFIFO_A_GPFIFO_INTERFACE_ID << 8) | NVA06F_CTRL_GPFIFO_SCHEDULE_PARAMS_MESSAGE_ID" */
+
+typedef struct NVA06F_CTRL_GPFIFO_SCHEDULE_PARAMS {
+    NvBool bEnable;
+    NvBool bSkipSubmit;
+} NVA06F_CTRL_GPFIFO_SCHEDULE_PARAMS;
+
+#define NVA06F_CTRL_CMD_BIND (0xa06f0104) /* finn: Evaluated from "(FINN_KEPLER_CHANNEL_GPFIFO_A_GPFIFO_INTERFACE_ID << 8) | NVA06F_CTRL_BIND_PARAMS_MESSAGE_ID" */
+
+typedef struct NVA06F_CTRL_BIND_PARAMS {
+    NvU32 engineType;
+} NVA06F_CTRL_BIND_PARAMS;
+
+#endif

drivers/gpu/drm/nouveau/include/nvrm/535.54.03/common/sdk/nvidia/inc/nvlimits.h

@@ -26,6 +26,8 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#define NV_MAX_SUBDEVICES       8
+
 #define NV_PROC_NAME_MAX_LENGTH 100U
 
 #endif