[PATCH v3 1/7] drm: Add common fdinfo helper

[Rob Clark <robdclark@gmail.com>]

From: Rob Clark <robdclark@chromium.org>

Handle a bit of the boiler-plate in a single case, and make it easier to
add some core tracked stats.

Signed-off-by: Rob Clark <robdclark@chromium.org>
---
 drivers/gpu/drm/drm_file.c | 39 ++++++++++++++++++++++++++++++++++++++
 include/drm/drm_drv.h      |  7 +++++++
 include/drm/drm_file.h     |  4 ++++
 3 files changed, 50 insertions(+)

diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index a51ff8cee049..37dfaa6be560 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -148,6 +148,7 @@ bool drm_dev_needs_global_mutex(struct drm_device *dev)
  */
 struct drm_file *drm_file_alloc(struct drm_minor *minor)
 {
+	static atomic_t ident = ATOMIC_INIT(0);
 	struct drm_device *dev = minor->dev;
 	struct drm_file *file;
 	int ret;
@@ -156,6 +157,8 @@ struct drm_file *drm_file_alloc(struct drm_minor *minor)
 	if (!file)
 		return ERR_PTR(-ENOMEM);
 
+	/* Get a unique identifier for fdinfo: */
+	file->client_id = atomic_inc_return(&ident) - 1;
 	file->pid = get_pid(task_pid(current));
 	file->minor = minor;
 
@@ -868,6 +871,42 @@ void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
 }
 EXPORT_SYMBOL(drm_send_event);
 
+/**
+ * drm_fop_show_fdinfo - helper for drm file fops
+ * @seq_file: output stream
+ * @f: the device file instance
+ *
+ * Helper to implement fdinfo, for userspace to query usage stats, etc, of a
+ * process using the GPU.
+ */
+void drm_fop_show_fdinfo(struct seq_file *m, struct file *f)
+{
+	struct drm_file *file = f->private_data;
+	struct drm_device *dev = file->minor->dev;
+	struct drm_printer p = drm_seq_file_printer(m);
+
+	/*
+	 * ******************************************************************
+	 * For text output format description please see drm-usage-stats.rst!
+	 * ******************************************************************
+	 */
+
+	drm_printf(&p, "drm-driver:\t%s\n", dev->driver->name);
+	drm_printf(&p, "drm-client-id:\t%u\n", file->client_id);
+
+	if (dev_is_pci(dev->dev)) {
+		struct pci_dev *pdev = to_pci_dev(dev->dev);
+
+		drm_printf(&p, "drm-pdev:\t%04x:%02x:%02x.%d\n",
+			   pci_domain_nr(pdev->bus), pdev->bus->number,
+			   PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
+	}
+
+	if (dev->driver->show_fdinfo)
+		dev->driver->show_fdinfo(&p, file);
+}
+EXPORT_SYMBOL(drm_fop_show_fdinfo);
+
 /**
  * mock_drm_getfile - Create a new struct file for the drm device
  * @minor: drm minor to wrap (e.g. #drm_device.primary)
diff --git a/include/drm/drm_drv.h b/include/drm/drm_drv.h
index 5b86bb7603e7..a883c6d3bcdf 100644
--- a/include/drm/drm_drv.h
+++ b/include/drm/drm_drv.h
@@ -401,6 +401,13 @@ struct drm_driver {
 			       struct drm_device *dev, uint32_t handle,
 			       uint64_t *offset);
 
+	/**
+	 * @fdinfo:
+	 *
+	 * Print device specific fdinfo.  See drm-usage-stats.rst.
+	 */
+	void (*show_fdinfo)(struct drm_printer *p, struct drm_file *f);
+
 	/** @major: driver major number */
 	int major;
 	/** @minor: driver minor number */
diff --git a/include/drm/drm_file.h b/include/drm/drm_file.h
index 0d1f853092ab..dfa995b787e1 100644
--- a/include/drm/drm_file.h
+++ b/include/drm/drm_file.h
@@ -258,6 +258,9 @@ struct drm_file {
 	/** @pid: Process that opened this file. */
 	struct pid *pid;
 
+	/** @client_id: A unique id for fdinfo */
+	u32 client_id;
+
 	/** @magic: Authentication magic, see @authenticated. */
 	drm_magic_t magic;
 
@@ -437,6 +440,7 @@ void drm_send_event(struct drm_device *dev, struct drm_pending_event *e);
 void drm_send_event_timestamp_locked(struct drm_device *dev,
 				     struct drm_pending_event *e,
 				     ktime_t timestamp);
+void drm_fop_show_fdinfo(struct seq_file *m, struct file *f);
 
 struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int flags);
 
-- 
2.39.2