From: "Kumar, Mahesh" <mahesh1.kumar@xxxxxxxxx>
This patch creates an entry in debugfs to check the status of IPC.
This can also be used to enable/disable IPC in supported platforms.
Signed-off-by: Mahesh Kumar <mahesh1.kumar@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 73 ++++++++++++++++++++++++++++++++++++-
1 file changed, 72 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2ef75c1a6119..368f64de0fdc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3592,6 +3592,76 @@ static int i915_wa_registers(struct seq_file *m, void *unused)
return 0;
}
+static int i915_ipc_status_show(struct seq_file *m, void *data)
+{
+ struct drm_i915_private *dev_priv = m->private;
+
+ seq_printf(m, "Isochronous Priority Control: %s\n",
+ enableddisabled(dev_priv->ipc_enabled));
+ return 0;
+}
+
+static int i915_ipc_status_open(struct inode *inode, struct file *file)
+{
+ struct drm_i915_private *dev_priv = inode->i_private;
+
+ if (HAS_IPC(dev_priv))
+ return -ENODEV;
+
+ return single_open(file, i915_ipc_status_show, dev_priv);
+}
+
+static ssize_t i915_ipc_status_write(struct file *file, const char __user *ubuf,
+ size_t len, loff_t *offp)
+{
+ struct seq_file *m = file->private_data;
+ struct drm_i915_private *dev_priv = m->private;
+ char *newline;
+ char tmp[16];
+ bool enable;
+
+ if (HAS_IPC(dev_priv))
+ return -ENODEV;
+
+ if (len >= sizeof(tmp))
+ return -EINVAL;
+
+ if (copy_from_user(tmp, ubuf, len))
+ return -EFAULT;
+
+ tmp[len] = '\0';
+
+ /* Strip newline, if any */
+ newline = strchr(tmp, '\n');
+ if (newline)
+ *newline = '\0';
+
+ if (strcmp(tmp, "0") == 0 || strcmp(tmp, "disable") == 0 ||
+ strcmp(tmp, "off") == 0 || strcmp(tmp, "dis") == 0)
+ enable = false;
+ else if (strcmp(tmp, "1") == 0 || strcmp(tmp, "enable") == 0 ||
+ strcmp(tmp, "on") == 0 || strcmp(tmp, "en") == 0)
+ enable = true;
+ else
+ return -EINVAL;
+
+ intel_runtime_pm_get(dev_priv);
+ dev_priv->ipc_enabled = enable;
+ intel_enable_ipc(dev_priv);
+ intel_runtime_pm_put(dev_priv);
+
+ return len;
+}
+
+static const struct file_operations i915_ipc_status_fops = {
+ .owner = THIS_MODULE,
+ .open = i915_ipc_status_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = i915_ipc_status_write
+};
+
static int i915_ddb_info(struct seq_file *m, void *unused)
{
struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -4929,7 +4999,8 @@ static const struct i915_debugfs_files {
{"i915_dp_test_type", &i915_displayport_test_type_fops},
{"i915_dp_test_active", &i915_displayport_test_active_fops},
{"i915_guc_log_control", &i915_guc_log_control_fops},
- {"i915_hpd_storm_ctl", &i915_hpd_storm_ctl_fops}
+ {"i915_hpd_storm_ctl", &i915_hpd_storm_ctl_fops},
+ {"i915_ipc_status", &i915_ipc_status_fops}
};
int i915_debugfs_register(struct drm_i915_private *dev_priv)
--
2.13.0
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