[PATCH 15/20] drm/i915/slpc: Add enable/disable controls for SLPC tasks

[Sagar Arun Kamble <sagar.a.kamble@intel.com>]

From: Tom O'Rourke <Tom.O'Rourke@intel.com>

Adds debugfs hooks for enabling/disabling each SLPC task.

The enable/disable debugfs files are
i915_slpc_gtperf, i915_slpc_balancer, and i915_slpc_dcc.

Each of these can take the values:
"default", "enabled", or "disabled"

v1: update for SLPC v2015.2.4
    dfps and turbo merged and renamed "gtperf"
    ibc split out and renamed "balancer"
    Avoid magic numbers (Jon Bloomfield)

v2-v3: Rebase.

v5: Moved slpc_enable_disable_set and slpc_enable_disable_get to
    intel_slpc.c. s/slpc_enable_disable_get/intel_slpc_task_status
    and s/slpc_enable_disable_set/intel_slpc_task_control. Prepared
    separate functions to update the task status only in the SLPC
    shared memory. Passing dev_priv as parameter.

v6: Rebase. s/slpc_param_show|write/slpc_task_param_show|write.
    Moved functions to intel_slpc.c. RPM Get/Put added before setting
    parameters and sending RESET event explicitly. (Sagar)

Signed-off-by: Tom O'Rourke <Tom.O'Rourke@intel.com>
Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c |   3 +
 drivers/gpu/drm/i915/intel_slpc.c   | 184 ++++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_slpc.h   |   3 +
 3 files changed, 190 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 91edc2f..8d0d094 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4894,6 +4894,9 @@ static int i915_hpd_storm_ctl_open(struct inode *inode, struct file *file)
 	const struct file_operations *fops;
 } i915_debugfs_files[] = {
 	{"i915_wedged", &i915_wedged_fops},
+	{"i915_slpc_gtperf", &i915_slpc_gtperf_fops},
+	{"i915_slpc_balancer", &i915_slpc_balancer_fops},
+	{"i915_slpc_dcc", &i915_slpc_dcc_fops},
 	{"i915_max_freq", &i915_max_freq_fops},
 	{"i915_min_freq", &i915_min_freq_fops},
 	{"i915_cache_sharing", &i915_cache_sharing_fops},
diff --git a/drivers/gpu/drm/i915/intel_slpc.c b/drivers/gpu/drm/i915/intel_slpc.c
index 7410e2d..093d670 100644
--- a/drivers/gpu/drm/i915/intel_slpc.c
+++ b/drivers/gpu/drm/i915/intel_slpc.c
@@ -799,3 +799,187 @@ static ssize_t slpc_param_ctl_write(struct file *file, const char __user *ubuf,
 	.release = single_release,
 	.write = slpc_param_ctl_write
 };
+
+static void slpc_task_param_show(struct seq_file *m, u32 enable_id,
+				 u32 disable_id)
+{
+	struct drm_i915_private *dev_priv = m->private;
+	const char *status;
+	u64 val;
+	int ret;
+
+	ret = intel_slpc_task_status(&dev_priv->guc.slpc, &val,
+				     enable_id, disable_id);
+
+	if (ret) {
+		seq_printf(m, "error %d\n", ret);
+	} else {
+		switch (val) {
+		case SLPC_PARAM_TASK_DEFAULT:
+			status = "default\n";
+			break;
+
+		case SLPC_PARAM_TASK_ENABLED:
+			status = "enabled\n";
+			break;
+
+		case SLPC_PARAM_TASK_DISABLED:
+			status = "disabled\n";
+			break;
+
+		default:
+			status = "unknown\n";
+			break;
+		}
+
+		seq_puts(m, status);
+	}
+}
+
+static int slpc_task_param_write(struct seq_file *m, const char __user *ubuf,
+			    size_t len, u32 enable_id, u32 disable_id)
+{
+	struct drm_i915_private *dev_priv = m->private;
+	u64 val;
+	int ret = 0;
+	char buf[10];
+
+	if (len >= sizeof(buf))
+		ret = -EINVAL;
+	else if (copy_from_user(buf, ubuf, len))
+		ret = -EFAULT;
+	else
+		buf[len] = '\0';
+
+	if (!ret) {
+		if (!strncmp(buf, "default", 7))
+			val = SLPC_PARAM_TASK_DEFAULT;
+		else if (!strncmp(buf, "enabled", 7))
+			val = SLPC_PARAM_TASK_ENABLED;
+		else if (!strncmp(buf, "disabled", 8))
+			val = SLPC_PARAM_TASK_DISABLED;
+		else
+			ret = -EINVAL;
+	}
+
+	if (!ret)
+		ret = intel_slpc_task_control(&dev_priv->guc.slpc, val,
+					      enable_id, disable_id);
+
+	return ret;
+}
+
+static int slpc_gtperf_show(struct seq_file *m, void *data)
+{
+	slpc_task_param_show(m, SLPC_PARAM_TASK_ENABLE_GTPERF,
+			SLPC_PARAM_TASK_DISABLE_GTPERF);
+
+	return 0;
+}
+
+static int slpc_gtperf_open(struct inode *inode, struct file *file)
+{
+	struct drm_i915_private *dev_priv = inode->i_private;
+
+	return single_open(file, slpc_gtperf_show, dev_priv);
+}
+
+static ssize_t slpc_gtperf_write(struct file *file, const char __user *ubuf,
+			      size_t len, loff_t *offp)
+{
+	struct seq_file *m = file->private_data;
+	int ret = 0;
+
+	ret = slpc_task_param_write(m, ubuf, len, SLPC_PARAM_TASK_ENABLE_GTPERF,
+			       SLPC_PARAM_TASK_DISABLE_GTPERF);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+const struct file_operations i915_slpc_gtperf_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = slpc_gtperf_open,
+	.release = single_release,
+	.read	 = seq_read,
+	.write	 = slpc_gtperf_write,
+	.llseek	 = seq_lseek
+};
+
+static int slpc_balancer_show(struct seq_file *m, void *data)
+{
+	slpc_task_param_show(m, SLPC_PARAM_TASK_ENABLE_BALANCER,
+			SLPC_PARAM_TASK_DISABLE_BALANCER);
+
+	return 0;
+}
+
+static int slpc_balancer_open(struct inode *inode, struct file *file)
+{
+	struct drm_i915_private *dev_priv = inode->i_private;
+
+	return single_open(file, slpc_balancer_show, dev_priv);
+}
+
+static ssize_t slpc_balancer_write(struct file *file, const char __user *ubuf,
+			      size_t len, loff_t *offp)
+{
+	struct seq_file *m = file->private_data;
+	int ret = 0;
+
+	ret = slpc_task_param_write(m, ubuf, len,
+				SLPC_PARAM_TASK_ENABLE_BALANCER,
+				SLPC_PARAM_TASK_DISABLE_BALANCER);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+const struct file_operations i915_slpc_balancer_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = slpc_balancer_open,
+	.release = single_release,
+	.read	 = seq_read,
+	.write	 = slpc_balancer_write,
+	.llseek	 = seq_lseek
+};
+
+static int slpc_dcc_show(struct seq_file *m, void *data)
+{
+	slpc_task_param_show(m, SLPC_PARAM_TASK_ENABLE_DCC,
+			SLPC_PARAM_TASK_DISABLE_DCC);
+
+	return 0;
+}
+
+static int slpc_dcc_open(struct inode *inode, struct file *file)
+{
+	struct drm_i915_private *dev_priv = inode->i_private;
+
+	return single_open(file, slpc_dcc_show, dev_priv);
+}
+
+static ssize_t slpc_dcc_write(struct file *file, const char __user *ubuf,
+			      size_t len, loff_t *offp)
+{
+	struct seq_file *m = file->private_data;
+	int ret = 0;
+
+	ret = slpc_task_param_write(m, ubuf, len, SLPC_PARAM_TASK_ENABLE_DCC,
+			       SLPC_PARAM_TASK_DISABLE_DCC);
+	if (ret)
+		return ret;
+
+	return len;
+}
+
+const struct file_operations i915_slpc_dcc_fops = {
+	.owner	 = THIS_MODULE,
+	.open	 = slpc_dcc_open,
+	.release = single_release,
+	.read	 = seq_read,
+	.write	 = slpc_dcc_write,
+	.llseek	 = seq_lseek
+};
diff --git a/drivers/gpu/drm/i915/intel_slpc.h b/drivers/gpu/drm/i915/intel_slpc.h
index d2d7448..796822b 100644
--- a/drivers/gpu/drm/i915/intel_slpc.h
+++ b/drivers/gpu/drm/i915/intel_slpc.h
@@ -246,6 +246,9 @@ struct slpc_param {
 #define SLPC_PARAM_TASK_UNKNOWN  3
 
 extern const struct file_operations i915_slpc_param_ctl_fops;
+extern const struct file_operations i915_slpc_gtperf_fops;
+extern const struct file_operations i915_slpc_balancer_fops;
+extern const struct file_operations i915_slpc_dcc_fops;
 
 /* intel_slpc.c */
 void intel_slpc_set_param(struct intel_slpc *slpc, u32 id, u32 value);
-- 
1.9.1

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