gpu: nvgpu: 3d.emc bandwidth ratio policy

Modify the 3d.emc policy to use a formula based on bandwidth and
utilization instead of the current sku-dependent policy.

Bug 1364894

Change-Id: Id97f765a48f0aa9f5ebeb0c82bccb22db474a1ae
Signed-off-by: Samuel Russell <samuelr@nvidia.com>
Reviewed-on: http://git-master/r/453586
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c b/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
index bec18328..fceed5e9 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_sysfs.c
@@ -469,6 +469,32 @@ static ssize_t allow_all_enable_store(struct device *device,
 static DEVICE_ATTR(allow_all, ROOTRW,
                 allow_all_enable_read, allow_all_enable_store);
 
+static ssize_t emc3d_ratio_store(struct device *device,
+        struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct platform_device *ndev = to_platform_device(device);
+        struct gk20a *g = get_gk20a(ndev);
+        unsigned long val = 0;
+
+        if (kstrtoul(buf, 10, &val) < 0)
+                return -EINVAL;
+
+        g->emc3d_ratio = val;
+
+        return count;
+}
+
+static ssize_t emc3d_ratio_read(struct device *device,
+        struct device_attribute *attr, char *buf)
+{
+        struct platform_device *ndev = to_platform_device(device);
+        struct gk20a *g = get_gk20a(ndev);
+
+        return sprintf(buf, "%d\n", g->emc3d_ratio);
+}
+
+static DEVICE_ATTR(emc3d_ratio, ROOTRW, emc3d_ratio_read, emc3d_ratio_store);
+
 #ifdef CONFIG_PM_RUNTIME
 static ssize_t force_idle_store(struct device *device,
         struct device_attribute *attr, const char *buf, size_t count)
@@ -566,6 +592,7 @@ void gk20a_remove_sysfs(struct device *dev)
         device_remove_file(dev, &dev_attr_slcg_enable);
         device_remove_file(dev, &dev_attr_ptimer_scale_factor);
         device_remove_file(dev, &dev_attr_elpg_enable);
+        device_remove_file(dev, &dev_attr_emc3d_ratio);
         device_remove_file(dev, &dev_attr_counters);
         device_remove_file(dev, &dev_attr_counters_reset);
         device_remove_file(dev, &dev_attr_load);
@@ -593,6 +620,7 @@ void gk20a_create_sysfs(struct platform_device *dev)
         error |= device_create_file(&dev->dev, &dev_attr_slcg_enable);
         error |= device_create_file(&dev->dev, &dev_attr_ptimer_scale_factor);
         error |= device_create_file(&dev->dev, &dev_attr_elpg_enable);
+        error |= device_create_file(&dev->dev, &dev_attr_emc3d_ratio);
         error |= device_create_file(&dev->dev, &dev_attr_counters);
         error |= device_create_file(&dev->dev, &dev_attr_counters_reset);
         error |= device_create_file(&dev->dev, &dev_attr_load);