gpu: nvgpu: vgpu: retrieve gpu load

Add support to send command to RM server to retrieve
GPU load.

Bug 200261903

Change-Id: Ie3d0ba7ec91317e9a2911f71613ad78d20f9c1fb
Signed-off-by: Aparna Das <aparnad@nvidia.com>
Reviewed-on: http://git-master/r/1275045
(cherry picked from commit 5a6c1de1e6997bfd803b4b95b3e44e282ba32f67)
Reviewed-on: http://git-master/r/1283279
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

4 files changed, 55 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/Makefile.nvgpu b/drivers/gpu/nvgpu/Makefile.nvgpu
index 30e2bdeb..c3c5fa8c 100644
--- a/drivers/gpu/nvgpu/Makefile.nvgpu
+++ b/drivers/gpu/nvgpu/Makefile.nvgpu
@@ -115,7 +115,8 @@ nvgpu-$(CONFIG_TEGRA_GR_VIRTUALIZATION) += \
         vgpu/gk20a/vgpu_hal_gk20a.o \
         vgpu/gk20a/vgpu_gr_gk20a.o \
         vgpu/gm20b/vgpu_hal_gm20b.o \
-        vgpu/gm20b/vgpu_gr_gm20b.o
+        vgpu/gm20b/vgpu_gr_gm20b.o \
+        vgpu/sysfs_vgpu.o
 
 nvgpu-$(CONFIG_TEGRA_CLK_FRAMEWORK) += gk20a/clk_gk20a.o
 ifneq (,$filter y,$(CONFIG_TEGRA_CLK_FRAMEWORK),$(CONFIG_COMMON_CLK))
diff --git a/drivers/gpu/nvgpu/vgpu/sysfs_vgpu.c b/drivers/gpu/nvgpu/vgpu/sysfs_vgpu.c
new file mode 100644
index 00000000..d43a34aa
--- /dev/null
+++ b/drivers/gpu/nvgpu/vgpu/sysfs_vgpu.c
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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 <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/gk20a.h>
+
+#include "vgpu/vgpu.h"
+
+static ssize_t vgpu_load_show(struct device *dev,
+                              struct device_attribute *attr,
+                              char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+        struct tegra_vgpu_cmd_msg msg = {0};
+        struct tegra_vgpu_gpu_load_params *p = &msg.params.gpu_load;
+        int err;
+
+        msg.cmd = TEGRA_VGPU_CMD_GET_GPU_LOAD;
+        msg.handle = vgpu_get_handle(g);
+        err = vgpu_comm_sendrecv(&msg, sizeof(msg), sizeof(msg));
+        if (err)
+                return err;
+
+        return snprintf(buf, PAGE_SIZE, "%u\n", p->load);
+}
+static DEVICE_ATTR(load, S_IRUGO, vgpu_load_show, NULL);
+
+void vgpu_create_sysfs(struct device *dev)
+{
+        if (device_create_file(dev, &dev_attr_load))
+                dev_err(dev, "Failed to create vgpu sysfs attributes!\n");
+}
+
+void vgpu_remove_sysfs(struct device *dev)
+{
+        device_remove_file(dev, &dev_attr_load);
+}
diff --git a/drivers/gpu/nvgpu/vgpu/vgpu.c b/drivers/gpu/nvgpu/vgpu/vgpu.c
index 0ac79345..ba387de9 100644
--- a/drivers/gpu/nvgpu/vgpu/vgpu.c
+++ b/drivers/gpu/nvgpu/vgpu/vgpu.c
@@ -632,6 +632,7 @@ int vgpu_probe(struct platform_device *pdev)
                         CONFIG_GK20A_DEFAULT_TIMEOUT;
         gk20a->timeouts_enabled = true;
 
+        vgpu_create_sysfs(dev);
         gk20a_init_gr(gk20a);
 
         return 0;
@@ -650,6 +651,7 @@ int vgpu_remove(struct platform_device *pdev)
         vgpu_comm_deinit();
         gk20a_sched_ctrl_cleanup(g);
         gk20a_user_deinit(dev, &nvgpu_class);
+        vgpu_remove_sysfs(dev);
         gk20a_get_platform(dev)->g = NULL;
         kfree(g);
         return 0;
diff --git a/drivers/gpu/nvgpu/vgpu/vgpu.h b/drivers/gpu/nvgpu/vgpu/vgpu.h
index e64b31b4..098c7dbd 100644
--- a/drivers/gpu/nvgpu/vgpu/vgpu.h
+++ b/drivers/gpu/nvgpu/vgpu/vgpu.h
@@ -103,6 +103,9 @@ int vgpu_gk20a_init_hal(struct gk20a *g);
 int vgpu_gm20b_init_hal(struct gk20a *g);
 
 void vgpu_init_dbg_session_ops(struct gpu_ops *gops);
+
+void vgpu_create_sysfs(struct device *dev);
+void vgpu_remove_sysfs(struct device *dev);
 #else
 static inline int vgpu_pm_prepare_poweroff(struct device *dev)
 {