gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/sentry/devices/nvproxy/nvproxy_unsafe.go (about)

     1  // Copyright 2023 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package nvproxy
    16  
    17  import (
    18  	"bytes"
    19  	"fmt"
    20  	"unsafe"
    21  
    22  	"golang.org/x/sys/unix"
    23  	"gvisor.dev/gvisor/pkg/abi/nvgpu"
    24  )
    25  
    26  // HostDriverVersion returns the version of the host Nvidia driver.
    27  func HostDriverVersion() (string, error) {
    28  	ctlFD, err := unix.Openat(-1, "/dev/nvidiactl", unix.O_RDONLY|unix.O_NOFOLLOW, 0)
    29  	if err != nil {
    30  		return "", fmt.Errorf("failed to open /dev/nvidiactl: %w", err)
    31  	}
    32  	defer unix.Close(ctlFD)
    33  
    34  	// From src/nvidia/arch/nvalloc/unix/include/nv-ioctl.h:
    35  	const NV_RM_API_VERSION_REPLY_RECOGNIZED = 1
    36  
    37  	// 530.30.02 and later versions of the host driver `#define
    38  	// NV_RM_API_VERSION_CMD_QUERY '2'`, which causes this ioctl to return the
    39  	// driver version without performing a check. Earlier versions of the
    40  	// driver `#define NV_RM_API_VERSION_CMD_OVERRIDE '2'`, which causes the
    41  	// ioctl to no-op. Try with Cmd '2' first, hoping that the driver
    42  	// interprets it as _QUERY; if the returned string is empty, then it was
    43  	// interpreted as _OVERRIDE and we need to perform an actual check (Cmd 0),
    44  	// which has the downside of logging an error message.
    45  	ioctlParams := nvgpu.RMAPIVersion{
    46  		Cmd: '2',
    47  	}
    48  	if _, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(ctlFD), frontendIoctlCmd(nvgpu.NV_ESC_CHECK_VERSION_STR, uint32(unsafe.Sizeof(ioctlParams))), uintptr(unsafe.Pointer(&ioctlParams))); errno != 0 {
    49  		return "", fmt.Errorf("NV_ESC_CHECK_VERSION_STR ioctl error: %w", errno)
    50  	}
    51  	if ioctlParams.Reply != NV_RM_API_VERSION_REPLY_RECOGNIZED {
    52  		return "", fmt.Errorf("unknown NV_ESC_CHECK_VERSION_STR reply: %d", ioctlParams.Reply)
    53  	}
    54  	if ioctlParams.VersionString[0] == '\x00' {
    55  		ioctlParams.Cmd = 0
    56  		ioctlParams.Reply = 0
    57  		// We expect the check to fail on our empty version string, so tolerate
    58  		// EINVAL.
    59  		if _, _, errno := unix.RawSyscall(unix.SYS_IOCTL, uintptr(ctlFD), frontendIoctlCmd(nvgpu.NV_ESC_CHECK_VERSION_STR, uint32(unsafe.Sizeof(ioctlParams))), uintptr(unsafe.Pointer(&ioctlParams))); errno != 0 && errno != unix.EINVAL {
    60  			return "", fmt.Errorf("fallback NV_ESC_CHECK_VERSION_STR ioctl error: %w", errno)
    61  		}
    62  		if ioctlParams.Reply != NV_RM_API_VERSION_REPLY_RECOGNIZED {
    63  			return "", fmt.Errorf("unknown fallback NV_ESC_CHECK_VERSION_STR reply: %d", ioctlParams.Reply)
    64  		}
    65  	}
    66  
    67  	if i := bytes.IndexByte(ioctlParams.VersionString[:], '\x00'); i >= 0 {
    68  		return string(ioctlParams.VersionString[:i]), nil
    69  	}
    70  	return string(ioctlParams.VersionString[:]), nil
    71  }
    72  
    73  func p64FromPtr(ptr unsafe.Pointer) nvgpu.P64 {
    74  	return nvgpu.P64(uint64(uintptr(ptr)))
    75  }