Re: [PATCH 1/2] drm/amdgpu: Merge debug module parameters

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Am 24.08.23 um 18:25 schrieb André Almeida:
Merge all developer debug options available as separated module
parameters in one, making it obvious that are for developers.

Signed-off-by: André Almeida <andrealmeid@xxxxxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c  | 24 ++++++++++++++++++++++++
  drivers/gpu/drm/amd/include/amd_shared.h |  9 +++++++++
  2 files changed, 33 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index f5856b82605e..d53e4097acc0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -194,6 +194,7 @@ int amdgpu_use_xgmi_p2p = 1;
  int amdgpu_vcnfw_log;
  int amdgpu_sg_display = -1; /* auto */
  int amdgpu_user_partt_mode = AMDGPU_AUTO_COMPUTE_PARTITION_MODE;
+uint amdgpu_debug_mask;
static void amdgpu_drv_delayed_reset_work_handler(struct work_struct *work); @@ -938,6 +939,9 @@ module_param_named(user_partt_mode, amdgpu_user_partt_mode, uint, 0444);
  module_param(enforce_isolation, bool, 0444);
  MODULE_PARM_DESC(enforce_isolation, "enforce process isolation between graphics and compute . enforce_isolation = on");
+MODULE_PARM_DESC(debug_mask, "debug options for amdgpu, disabled by default");
+module_param_named(debug_mask, amdgpu_debug_mask, uint, 0444);
+
  /* These devices are not supported by amdgpu.
   * They are supported by the mach64, r128, radeon drivers
   */
@@ -2871,6 +2875,24 @@ static struct pci_driver amdgpu_kms_pci_driver = {
  	.dev_groups = amdgpu_sysfs_groups,
  };
+static void amdgpu_init_debug_options(void)
+{
+	if (amdgpu_debug_mask & DEBUG_VERBOSE_EVICTIONS) {
+		pr_info("debug: eviction debug messages enabled\n");
+		debug_evictions = true;
+	}
+
+	if (amdgpu_debug_mask & DEBUG_VM) {
+		pr_info("debug: VM handling debug enabled\n");
+		amdgpu_vm_debug = true;
+	}
+
+	if (amdgpu_debug_mask & DEBUG_LARGEBAR) {
+		pr_info("debug: enabled simulating large-bar capability on non-large bar system\n");
+		debug_largebar = true;

How should that work???

+	}
+}
+
  static int __init amdgpu_init(void)
  {
  	int r;
@@ -2893,6 +2915,8 @@ static int __init amdgpu_init(void)
  	/* Ignore KFD init failures. Normal when CONFIG_HSA_AMD is not set. */
  	amdgpu_amdkfd_init();
+ amdgpu_init_debug_options();
+
  	/* let modprobe override vga console setting */
  	return pci_register_driver(&amdgpu_kms_pci_driver);
diff --git a/drivers/gpu/drm/amd/include/amd_shared.h b/drivers/gpu/drm/amd/include/amd_shared.h
index 67d7b7ee8a2a..6fa644c249a5 100644
--- a/drivers/gpu/drm/amd/include/amd_shared.h
+++ b/drivers/gpu/drm/amd/include/amd_shared.h
@@ -257,6 +257,15 @@ enum DC_DEBUG_MASK {
enum amd_dpm_forced_level; +/*
+ * amdgpu.debug module options. Are all disabled by default
+ */
+enum AMDGPU_DEBUG_MASK {
+	DEBUG_VERBOSE_EVICTIONS = (1 << 0),		// 0x1
+	DEBUG_VM = (1 << 1),				// 0x2
+	DEBUG_LARGEBAR = (1 << 2),			// 0x4

Good start, but please give the symbol names an AMDGPU_ prefix. Stuff like DEBUG_VM is just way to general and could clash.

Apart from that comments on the same line and using // style comments are frowned upon. You should probably rather use the BIT() macro here.

Regards,
Christian.

+
  /**
   * struct amd_ip_funcs - general hooks for managing amdgpu IP Blocks
   * @name: Name of IP block




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