drm/amdkfd: Module option to disable CRAT table

Some systems have broken CRAT tables. Add a module option to ignore a CRAT table. Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com> Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
mariux64 · Dec 9, 2017 · ebcfd1e · ebcfd1e
1 parent 413e85d
commit ebcfd1e
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Showing 3 changed files with 16 additions and 0 deletions.
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -696,6 +696,11 @@ int kfd_create_crat_image_acpi(void **crat_image, size_t *size)
 		return -EINVAL;
 	}
 
+	if (ignore_crat) {
+		pr_info("CRAT table disabled by module option\n");
+		return -ENODATA;
+	}
+
 	pcrat_image = kmalloc(crat_table->length, GFP_KERNEL);
 	if (!pcrat_image)
 		return -ENOMEM;

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_module.c b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
@@ -69,6 +69,11 @@ module_param(send_sigterm, int, 0444);
 MODULE_PARM_DESC(send_sigterm,
 	"Send sigterm to HSA process on unhandled exception (0 = disable, 1 = enable)");
 
+int ignore_crat;
+module_param(ignore_crat, int, 0444);
+MODULE_PARM_DESC(ignore_crat,
+	"Ignore CRAT table during KFD initialization (0 = use CRAT (default), 1 = ignore CRAT)");
+
 static int amdkfd_init_completed;
 
 int kgd2kfd_init(unsigned int interface_version,

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -104,6 +104,12 @@ extern int cwsr_enable;
  */
 extern int send_sigterm;
 
+/*
+ * Ignore CRAT table during KFD initialization, can be used to work around
+ * broken CRAT tables on some AMD systems
+ */
+extern int ignore_crat;
+
 /**
  * enum kfd_sched_policy
  *