sync with OpenBSD -current

sys/dev/pci/drm/drm_file.c

@@ -42,6 +42,7 @@
 #include <drm/drm_client.h>
 #include <drm/drm_drv.h>
 #include <drm/drm_file.h>
+#include <drm/drm_gem.h>
 #include <drm/drm_print.h>
 
 #include "drm_crtc_internal.h"
@@ -148,6 +149,7 @@ bool drm_dev_needs_global_mutex(struct drm_device *dev)
  */
 struct drm_file *drm_file_alloc(struct drm_minor *minor)
 {
+	static atomic64_t ident = ATOMIC64_INIT(0);
 	struct drm_device *dev = minor->dev;
 	struct drm_file *file;
 	int ret;
@@ -156,8 +158,10 @@ 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 = atomic64_inc_return(&ident);
 #ifdef __linux__
-	file->pid = get_pid(task_pid(current));
+	rcu_assign_pointer(file->pid, get_pid(task_tgid(current)));
 #endif
 	file->minor = minor;
 
@@ -198,7 +202,7 @@ out_prime_destroy:
 		drm_syncobj_release(file);
 	if (drm_core_check_feature(dev, DRIVER_GEM))
 		drm_gem_release(dev, file);
-	put_pid(file->pid);
+	put_pid(rcu_access_pointer(file->pid));
 	kfree(file);
 
 	return ERR_PTR(ret);
@@ -248,14 +252,14 @@ void drm_file_free(struct drm_file *file)
 	dev = file->minor->dev;
 
 #ifdef __linux__
-	DRM_DEBUG("comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
-		  current->comm, task_pid_nr(current),
-		  (long)old_encode_dev(file->minor->kdev->devt),
-		  atomic_read(&dev->open_count));
+	drm_dbg_core(dev, "comm=\"%s\", pid=%d, dev=0x%lx, open_count=%d\n",
+		     current->comm, task_pid_nr(current),
+		     (long)old_encode_dev(file->minor->kdev->devt),
+		     atomic_read(&dev->open_count));
 #else
-	DRM_DEBUG("pid = %d, device = 0x%lx, open_count = %d\n",
-	    curproc->p_p->ps_pid, (long)&dev->dev,
-	    atomic_read(&dev->open_count));
+	drm_dbg_core(dev, "pid=%d, dev=0x%lx, open_count=%d\n",
+		     curproc->p_p->ps_pid, (long)&dev->dev,
+		     atomic_read(&dev->open_count));
 #endif
 
 #ifdef CONFIG_DRM_LEGACY
@@ -295,7 +299,7 @@ void drm_file_free(struct drm_file *file)
 
 	WARN_ON(!list_empty(&file->event_list));
 
-	put_pid(file->pid);
+	put_pid(rcu_access_pointer(file->pid));
 	kfree(file);
 }
 
@@ -326,8 +330,6 @@ static int drm_cpu_valid(void)
 	return 1;
 }
 
-#endif /* __linux__ */
-
 /*
  * Called whenever a process opens a drm node
  *
@@ -338,8 +340,7 @@ static int drm_cpu_valid(void)
  * Creates and initializes a drm_file structure for the file private data in \p
  * filp and add it into the double linked list in \p dev.
  */
-#ifdef __linux__
-static int drm_open_helper(struct file *filp, struct drm_minor *minor)
+int drm_open_helper(struct file *filp, struct drm_minor *minor)
 {
 	struct drm_device *dev = minor->dev;
 	struct drm_file *priv;
@@ -353,8 +354,8 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 	    dev->switch_power_state != DRM_SWITCH_POWER_DYNAMIC_OFF)
 		return -EINVAL;
 
-	DRM_DEBUG("comm=\"%s\", pid=%d, minor=%d\n", current->comm,
-		  task_pid_nr(current), minor->index);
+	drm_dbg_core(dev, "comm=\"%s\", pid=%d, minor=%d\n",
+		     current->comm, task_pid_nr(current), minor->index);
 
 	priv = drm_file_alloc(minor);
 	if (IS_ERR(priv))
@@ -401,6 +402,7 @@ static int drm_open_helper(struct file *filp, struct drm_minor *minor)
 
 	return 0;
 }
+
 #endif /* __linux__ */
 
 /**
@@ -466,11 +468,11 @@ EXPORT_SYMBOL(drm_open);
 
 void drm_lastclose(struct drm_device * dev)
 {
-	DRM_DEBUG("\n");
+	drm_dbg_core(dev, "\n");
 
 	if (dev->driver->lastclose)
 		dev->driver->lastclose(dev);
-	DRM_DEBUG("driver lastclose completed\n");
+	drm_dbg_core(dev, "driver lastclose completed\n");
 
 	if (drm_core_check_feature(dev, DRIVER_LEGACY))
 		drm_legacy_dev_reinit(dev);
@@ -504,7 +506,7 @@ int drm_release(struct inode *inode, struct file *filp)
 	if (drm_dev_needs_global_mutex(dev))
 		mutex_lock(&drm_global_mutex);
 
-	DRM_DEBUG("open_count = %d\n", atomic_read(&dev->open_count));
+	drm_dbg_core(dev, "open_count = %d\n", atomic_read(&dev->open_count));
 
 	drm_close_helper(filp);
 
@@ -521,6 +523,45 @@ int drm_release(struct inode *inode, struct file *filp)
 }
 EXPORT_SYMBOL(drm_release);
 
+void drm_file_update_pid(struct drm_file *filp)
+{
+#ifdef notyet
+	struct drm_device *dev;
+	struct pid *pid, *old;
+#endif
+
+	/*
+	 * Master nodes need to keep the original ownership in order for
+	 * drm_master_check_perm to keep working correctly. (See comment in
+	 * drm_auth.c.)
+	 */
+	if (filp->was_master)
+		return;
+
+	STUB();
+#ifdef notyet
+	pid = task_tgid(current);
+
+	/*
+	 * Quick unlocked check since the model is a single handover followed by
+	 * exclusive repeated use.
+	 */
+	if (pid == rcu_access_pointer(filp->pid))
+		return;
+
+	dev = filp->minor->dev;
+	mutex_lock(&dev->filelist_mutex);
+	old = rcu_replace_pointer(filp->pid, pid, 1);
+	mutex_unlock(&dev->filelist_mutex);
+
+	if (pid != old) {
+		get_pid(pid);
+		synchronize_rcu();
+		put_pid(old);
+	}
+#endif
+}
+
 /**
  * drm_release_noglobal - release method for DRM file
  * @inode: device inode
@@ -901,6 +942,137 @@ void drm_send_event(struct drm_device *dev, struct drm_pending_event *e)
 }
 EXPORT_SYMBOL(drm_send_event);
 
+static void print_size(struct drm_printer *p, const char *stat,
+		       const char *region, u64 sz)
+{
+	const char *units[] = {"", " KiB", " MiB"};
+	unsigned u;
+
+	for (u = 0; u < ARRAY_SIZE(units) - 1; u++) {
+		if (sz < SZ_1K)
+			break;
+		sz = div_u64(sz, SZ_1K);
+	}
+
+	drm_printf(p, "drm-%s-%s:\t%llu%s\n", stat, region, sz, units[u]);
+}
+
+/**
+ * drm_print_memory_stats - A helper to print memory stats
+ * @p: The printer to print output to
+ * @stats: The collected memory stats
+ * @supported_status: Bitmask of optional stats which are available
+ * @region: The memory region
+ *
+ */
+void drm_print_memory_stats(struct drm_printer *p,
+			    const struct drm_memory_stats *stats,
+			    enum drm_gem_object_status supported_status,
+			    const char *region)
+{
+	print_size(p, "total", region, stats->private + stats->shared);
+	print_size(p, "shared", region, stats->shared);
+	print_size(p, "active", region, stats->active);
+
+	if (supported_status & DRM_GEM_OBJECT_RESIDENT)
+		print_size(p, "resident", region, stats->resident);
+
+	if (supported_status & DRM_GEM_OBJECT_PURGEABLE)
+		print_size(p, "purgeable", region, stats->purgeable);
+}
+EXPORT_SYMBOL(drm_print_memory_stats);
+
+/**
+ * drm_show_memory_stats - Helper to collect and show standard fdinfo memory stats
+ * @p: the printer to print output to
+ * @file: the DRM file
+ *
+ * Helper to iterate over GEM objects with a handle allocated in the specified
+ * file.
+ */
+void drm_show_memory_stats(struct drm_printer *p, struct drm_file *file)
+{
+	struct drm_gem_object *obj;
+	struct drm_memory_stats status = {};
+	enum drm_gem_object_status supported_status;
+	int id;
+
+	spin_lock(&file->table_lock);
+	idr_for_each_entry (&file->object_idr, obj, id) {
+		enum drm_gem_object_status s = 0;
+
+		if (obj->funcs && obj->funcs->status) {
+			s = obj->funcs->status(obj);
+			supported_status = DRM_GEM_OBJECT_RESIDENT |
+					DRM_GEM_OBJECT_PURGEABLE;
+		}
+
+		if (obj->handle_count > 1) {
+			status.shared += obj->size;
+		} else {
+			status.private += obj->size;
+		}
+
+		if (s & DRM_GEM_OBJECT_RESIDENT) {
+			status.resident += obj->size;
+		} else {
+			/* If already purged or not yet backed by pages, don't
+			 * count it as purgeable:
+			 */
+			s &= ~DRM_GEM_OBJECT_PURGEABLE;
+		}
+
+		if (!dma_resv_test_signaled(obj->resv, dma_resv_usage_rw(true))) {
+			status.active += obj->size;
+
+			/* If still active, don't count as purgeable: */
+			s &= ~DRM_GEM_OBJECT_PURGEABLE;
+		}
+
+		if (s & DRM_GEM_OBJECT_PURGEABLE)
+			status.purgeable += obj->size;
+	}
+	spin_unlock(&file->table_lock);
+
+	drm_print_memory_stats(p, &status, supported_status, "memory");
+}
+EXPORT_SYMBOL(drm_show_memory_stats);
+
+/**
+ * drm_show_fdinfo - helper for drm file fops
+ * @m: output stream
+ * @f: the device file instance
+ *
+ * Helper to implement fdinfo, for userspace to query usage stats, etc, of a
+ * process using the GPU.  See also &drm_driver.show_fdinfo.
+ *
+ * For text output format description please see Documentation/gpu/drm-usage-stats.rst
+ */
+void drm_show_fdinfo(struct seq_file *m, struct file *f)
+{
+	STUB();
+#ifdef notyet
+	struct drm_file *file = f->private_data;
+	struct drm_device *dev = file->minor->dev;
+	struct drm_printer p = drm_seq_file_printer(m);
+
+	drm_printf(&p, "drm-driver:\t%s\n", dev->driver->name);
+	drm_printf(&p, "drm-client-id:\t%llu\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);
+#endif
+}
+EXPORT_SYMBOL(drm_show_fdinfo);
+
 /**
  * mock_drm_getfile - Create a new struct file for the drm device
  * @minor: drm minor to wrap (e.g. #drm_device.primary)