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| author | Oded Gabbay <oded.gabbay@amd.com> | 2014-12-05 10:40:34 +0200 |
|---|---|---|
| committer | Oded Gabbay <oded.gabbay@amd.com> | 2014-12-05 22:01:35 +0200 |
| commit | a18069c132cb0d065ff23c05977d06ea0c78404f (patch) | |
| tree | 0801554a71620dadf55f319e2936f17f2df049fa | |
| parent | 7608867d0c4d9da30e9efe6a53ff4ee1e6c4990b (diff) | |
| download | linux-a18069c132cb0d065ff23c05977d06ea0c78404f.tar.gz | |
amdkfd: Disable support for 32-bit user processes
This patch checks if the process that opens the /dev/kfd device is 32-bit process. If so, it returns -EPERM and prints a warning message in dmesg. This is done to prevent 32-bit user processes from using amdkfd, and hence, HSA features. AMD's HSA userspace stack will also support only 64-bit processes on Linux. Reviewed-by: Alexey Skidanov <alexey.skidanov@amd.com> Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c index 102cd36799b1..4f7b275f2f7b 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c @@ -102,15 +102,26 @@ struct device *kfd_chardev(void) static int kfd_open(struct inode *inode, struct file *filep) { struct kfd_process *process; + bool is_32bit_user_mode; if (iminor(inode) != 0) return -ENODEV; + is_32bit_user_mode = is_compat_task(); + + if (is_32bit_user_mode == true) { + dev_warn(kfd_device, + "Process %d (32-bit) failed to open /dev/kfd\n" + "32-bit processes are not supported by amdkfd\n", + current->pid); + return -EPERM; + } + process = kfd_create_process(current); if (IS_ERR(process)) return PTR_ERR(process); - process->is_32bit_user_mode = is_compat_task(); + process->is_32bit_user_mode = is_32bit_user_mode; dev_dbg(kfd_device, "process %d opened, compat mode (32 bit) - %d\n", process->pasid, process->is_32bit_user_mode); |