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amdkfd: Disable support for 32-bit user processes

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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 <[email protected]>
Signed-off-by: Oded Gabbay <[email protected]>
This commit is contained in:
Oded Gabbay committed 2014-12-05 22:01:35 +02:00
1 parent 7608867d0c
commit a18069c132
1 file changed
+12 -1
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drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+12 -1
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@@ -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);