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>

drivers/gpu/nvgpu/Makefile

@@ -78,6 +78,7 @@ nvgpu-$(CONFIG_DEBUG_FS) += \
 	os/linux/debug_allocator.o \
 	os/linux/debug_hal.o \
 	os/linux/debug_clk.o \
+	os/linux/debug_bios.o \
 	os/linux/debug_xve.o
 
 ifeq ($(CONFIG_NVGPU_TRACK_MEM_USAGE),y)

drivers/gpu/nvgpu/os/linux/debug.c

@@ -22,6 +22,7 @@
 #include "debug_sched.h"
 #include "debug_hal.h"
 #include "debug_xve.h"
+#include "debug_bios.h"
 #include "os_linux.h"
 #include "platform_gk20a.h"
 
@@ -434,8 +435,10 @@ void gk20a_debug_init(struct gk20a *g, const char *debugfs_symlink)
 #ifdef CONFIG_NVGPU_TRACK_MEM_USAGE
 	nvgpu_kmem_debugfs_init(g);
 #endif
-	if (g->pci_vendor_id)
+	if (g->pci_vendor_id) {
 		nvgpu_xve_debugfs_init(g);
+		nvgpu_bios_debugfs_init(g);
+	}
 }
 
 void gk20a_debug_deinit(struct gk20a *g)

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;
+}

drivers/gpu/nvgpu/os/linux/debug_bios.h

@@ -0,0 +1,21 @@
+/*
+ * 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.
+ *
+ */
+
+#ifndef __NVGPU_DEBUG_BIOS_H__
+#define __NVGPU_DEBUG_BIOS_H__
+
+struct gk20a;
+int nvgpu_bios_debugfs_init(struct gk20a *g);
+
+#endif /* __NVGPU_DEBUG_BIOS_H__ */