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From 00852655a081d6f3785e7f9b947d7f01ab9b5a76 Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Fri, 8 Dec 2017 23:09:03 -0500
Subject: [PATCH 3431/4131] 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>
---
drivers/gpu/drm/amd/amdkfd/kfd_crat.c | 5 +++++
drivers/gpu/drm/amd/amdkfd/kfd_module.c | 5 +++++
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 6 ++++++
3 files changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index d00061b..2bc2816 100644
--- 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
index f50e494..3ac72be 100644
--- 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
index f0327c2..6a48d29 100644
--- 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
*
--
2.7.4
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