gpu: nvgpu: add bios debugfs node

Add bios debugfs node to get current VBIOS version.

Bug 2113607

Change-Id: I8d52b651f923080000a4ad529e7efa05667563ba
Signed-off-by: Thomas Fleury <tfleury@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1743030
Reviewed-by: Richard Zhao <rizhao@nvidia.com>
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-by: Vijayakumar Subbu <vsubbu@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/debug_bios.c b/drivers/gpu/nvgpu/os/linux/debug_bios.c
new file mode 100644
index 00000000..f69ccf38
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/debug_bios.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 NVIDIA Corporation.  All rights reserved.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <nvgpu/types.h>
+
+#include "debug_bios.h"
+#include "os_linux.h"
+
+#include <linux/debugfs.h>
+#include <linux/uaccess.h>
+
+static int bios_version_show(struct seq_file *s, void *unused)
+{
+        struct gk20a *g = s->private;
+
+        seq_printf(s, "Version %02x.%02x.%02x.%02x.%02x\n",
+                (g->bios.vbios_version >> 24) & 0xFF,
+                (g->bios.vbios_version >> 16) & 0xFF,
+                (g->bios.vbios_version >> 8) & 0xFF,
+                (g->bios.vbios_version >> 0) & 0xFF,
+                (g->bios.vbios_oem_version) & 0xFF);
+
+        return 0;
+}
+
+static int bios_version_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, bios_version_show, inode->i_private);
+}
+
+static const struct file_operations bios_version_fops = {
+        .open = bios_version_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = single_release,
+};
+
+
+int nvgpu_bios_debugfs_init(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+
+        debugfs_create_file("bios", S_IRUGO,
+                            gpu_root, g,
+                            &bios_version_fops);
+
+        return 0;
+}