Re: [PATCH] drm/amdgpu: mark a bunch of module parameters unsafe

Felix Kuehling <felix.kuehling@xxxxxxx> · Tue, 7 Jan 2025 17:17:13 -0500

On 2025-01-07 09:53, Christian König wrote:
We sometimes have people trying to use debugging options in production
environments.

Mark options only meant to be used for debugging as unsafe so that the
kernel is tainted when they are used.

Signed-off-by: Christian König <christian.koenig@xxxxxxx>

Acked-by: Felix Kuehling <felix.kuehling@xxxxxxx>

FWIW, we could do the same with some KFD-specific debug options: 
sched_policy, cwsr_enable, halt_if_hws_hang, hws_gws_support, 
no_queue_eviction_on_vm_fault, mtype_local.

Regards,
  Felix


---
  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c | 14 +++++++-------
  1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index acb9dc3705ac..9ddfdb02a6a2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -401,7 +401,7 @@ module_param_named(runpm, amdgpu_runtime_pm, int, 0444);
   * the kernel log for the list of IPs on the asic. The default is 0xffffffff (enable all blocks on a device).
   */
  MODULE_PARM_DESC(ip_block_mask, "IP Block Mask (all blocks enabled (default))");
-module_param_named(ip_block_mask, amdgpu_ip_block_mask, uint, 0444);
+module_param_named_unsafe(ip_block_mask, amdgpu_ip_block_mask, uint, 0444);
  
  /**
   * DOC: bapm (int)
@@ -459,7 +459,7 @@ module_param_named(vm_update_mode, amdgpu_vm_update_mode, int, 0444);
   * Enable experimental hw support (1 = enable). The default is 0 (disabled).
   */
  MODULE_PARM_DESC(exp_hw_support, "experimental hw support (1 = enable, 0 = disable (default))");
-module_param_named(exp_hw_support, amdgpu_exp_hw_support, int, 0444);
+module_param_named_unsafe(exp_hw_support, amdgpu_exp_hw_support, int, 0444);
  
  /**
   * DOC: dc (int)
@@ -570,14 +570,14 @@ module_param_named(compute_multipipe, amdgpu_compute_multipipe, int, 0444);
   * Set to enable GPU recovery mechanism (1 = enable, 0 = disable). The default is -1 (auto, disabled except SRIOV).
   */
  MODULE_PARM_DESC(gpu_recovery, "Enable GPU recovery mechanism, (1 = enable, 0 = disable, -1 = auto)");
-module_param_named(gpu_recovery, amdgpu_gpu_recovery, int, 0444);
+module_param_named_unsafe(gpu_recovery, amdgpu_gpu_recovery, int, 0444);
  
  /**
   * DOC: emu_mode (int)
   * Set value 1 to enable emulation mode. This is only needed when running on an emulator. The default is 0 (disabled).
   */
  MODULE_PARM_DESC(emu_mode, "Emulation mode, (1 = enable, 0 = disable)");
-module_param_named(emu_mode, amdgpu_emu_mode, int, 0444);
+module_param_named_unsafe(emu_mode, amdgpu_emu_mode, int, 0444);
  
  /**
   * DOC: ras_enable (int)
@@ -732,7 +732,7 @@ module_param_named(noretry, amdgpu_noretry, int, 0644);
   */
  MODULE_PARM_DESC(force_asic_type,
  	"A non negative value used to specify the asic type for all supported GPUs");
-module_param_named(force_asic_type, amdgpu_force_asic_type, int, 0444);
+module_param_named_unsafe(force_asic_type, amdgpu_force_asic_type, int, 0444);
  
  /**
   * DOC: use_xgmi_p2p (int)
@@ -955,7 +955,7 @@ module_param_named(freesync_video, amdgpu_freesync_vid_mode, uint, 0444);
   * GPU reset method (-1 = auto (default), 0 = legacy, 1 = mode0, 2 = mode1, 3 = mode2, 4 = baco)
   */
  MODULE_PARM_DESC(reset_method, "GPU reset method (-1 = auto (default), 0 = legacy, 1 = mode0, 2 = mode1, 3 = mode2, 4 = baco/bamaco)");
-module_param_named(reset_method, amdgpu_reset_method, int, 0644);
+module_param_named_unsafe(reset_method, amdgpu_reset_method, int, 0644);
  
  /**
   * DOC: bad_page_threshold (int) Bad page threshold is specifies the
@@ -1051,7 +1051,7 @@ module_param_named(seamless, amdgpu_seamless, int, 0444);
   * - 0x4: Disable GPU soft recovery, always do a full reset
   */
  MODULE_PARM_DESC(debug_mask, "debug options for amdgpu, disabled by default");
-module_param_named(debug_mask, amdgpu_debug_mask, uint, 0444);
+module_param_named_unsafe(debug_mask, amdgpu_debug_mask, uint, 0444);
  
  /**
   * DOC: agp (int)






