--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 Intel
+ *
+ * Based on drivers/base/devres.c
+ */
+
+#include <drm/drm_managed.h>
+
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include <drm/drm_device.h>
+#include <drm/drm_print.h>
+
+/**
+ * DOC: managed resources
+ *
+ * Inspired by struct &device managed resources, but tied to the lifetime of
+ * struct &drm_device, which can outlive the underlying physical device, usually
+ * when userspace has some open files and other handles to resources still open.
+ */
+struct drmres_node {
+ struct list_head entry;
+ drmres_release_t release;
+ const char *name;
+ size_t size;
+};
+
+struct drmres {
+ struct drmres_node node;
+ /*
+ * Some archs want to perform DMA into kmalloc caches
+ * and need a guaranteed alignment larger than
+ * the alignment of a 64-bit integer.
+ * Thus we use ARCH_KMALLOC_MINALIGN here and get exactly the same
+ * buffer alignment as if it was allocated by plain kmalloc().
+ */
+ u8 __aligned(ARCH_KMALLOC_MINALIGN) data[];
+};
+
+static void free_dr(struct drmres *dr)
+{
+ kfree_const(dr->node.name);
+ kfree(dr);
+}
+
+void drm_managed_release(struct drm_device *dev)
+{
+ struct drmres *dr, *tmp;
+
+ drm_dbg_drmres(dev, "drmres release begin\n");
+ list_for_each_entry_safe(dr, tmp, &dev->managed.resources, node.entry) {
+ drm_dbg_drmres(dev, "REL %p %s (%zu bytes)\n",
+ dr, dr->node.name, dr->node.size);
+
+ if (dr->node.release)
+ dr->node.release(dev, dr->node.size ? *(void **)&dr->data : NULL);
+
+ list_del(&dr->node.entry);
+ free_dr(dr);
+ }
+ drm_dbg_drmres(dev, "drmres release end\n");
+}
+
+/*
+ * Always inline so that kmalloc_track_caller tracks the actual interesting
+ * caller outside of drm_managed.c.
+ */
+static __always_inline struct drmres * alloc_dr(drmres_release_t release,
+ size_t size, gfp_t gfp, int nid)
+{
+ size_t tot_size;
+ struct drmres *dr;
+
+ /* We must catch any near-SIZE_MAX cases that could overflow. */
+ if (unlikely(check_add_overflow(sizeof(*dr), size, &tot_size)))
+ return NULL;
+
+ dr = kmalloc_node_track_caller(tot_size, gfp, nid);
+ if (unlikely(!dr))
+ return NULL;
+
+ memset(dr, 0, offsetof(struct drmres, data));
+
+ INIT_LIST_HEAD(&dr->node.entry);
+ dr->node.release = release;
+ dr->node.size = size;
+
+ return dr;
+}
+
+static void del_dr(struct drm_device *dev, struct drmres *dr)
+{
+ list_del_init(&dr->node.entry);
+
+ drm_dbg_drmres(dev, "DEL %p %s (%lu bytes)\n",
+ dr, dr->node.name, (unsigned long) dr->node.size);
+}
+
+static void add_dr(struct drm_device *dev, struct drmres *dr)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&dev->managed.lock, flags);
+ list_add(&dr->node.entry, &dev->managed.resources);
+ spin_unlock_irqrestore(&dev->managed.lock, flags);
+
+ drm_dbg_drmres(dev, "ADD %p %s (%lu bytes)\n",
+ dr, dr->node.name, (unsigned long) dr->node.size);
+}
+
+void drmm_add_final_kfree(struct drm_device *dev, void *container)
+{
+ WARN_ON(dev->managed.final_kfree);
+ WARN_ON(dev < (struct drm_device *) container);
+ WARN_ON(dev + 1 >=
+ (struct drm_device *) (container + ksize(container)));
+ dev->managed.final_kfree = container;
+}
+EXPORT_SYMBOL(drmm_add_final_kfree);
+
+int __drmm_add_action(struct drm_device *dev,
+ drmres_release_t action,
+ void *data, const char *name)
+{
+ struct drmres *dr;
+ void **void_ptr;
+
+ dr = alloc_dr(action, data ? sizeof(void*) : 0,
+ GFP_KERNEL | __GFP_ZERO,
+ dev_to_node(dev->dev));
+ if (!dr) {
+ drm_dbg_drmres(dev, "failed to add action %s for %p\n",
+ name, data);
+ return -ENOMEM;
+ }
+
+ dr->node.name = kstrdup_const(name, GFP_KERNEL);
+ if (data) {
+ void_ptr = (void **)&dr->data;
+ *void_ptr = data;
+ }
+
+ add_dr(dev, dr);
+
+ return 0;
+}
+EXPORT_SYMBOL(__drmm_add_action);
+
+void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp)
+{
+ struct drmres *dr;
+
+ dr = alloc_dr(NULL, size, gfp, dev_to_node(dev->dev));
+ if (!dr) {
+ drm_dbg_drmres(dev, "failed to allocate %zu bytes, %u flags\n",
+ size, gfp);
+ return NULL;
+ }
+ dr->node.name = kstrdup_const("kmalloc", GFP_KERNEL);
+
+ add_dr(dev, dr);
+
+ return dr->data;
+}
+EXPORT_SYMBOL(drmm_kmalloc);
+
+void drmm_kfree(struct drm_device *dev, void *data)
+{
+ struct drmres *dr_match = NULL, *dr;
+ unsigned long flags;
+
+ if (!data)
+ return;
+
+ spin_lock_irqsave(&dev->managed.lock, flags);
+ list_for_each_entry(dr, &dev->managed.resources, node.entry) {
+ if (dr->data == data) {
+ dr_match = dr;
+ del_dr(dev, dr_match);
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&dev->managed.lock, flags);
+
+ if (WARN_ON(!dr_match))
+ return;
+
+ free_dr(dr_match);
+}
+EXPORT_SYMBOL(drmm_kfree);
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+
+#ifndef _DRM_MANAGED_H_
+#define _DRM_MANAGED_H_
+
+#include <linux/gfp.h>
+#include <linux/types.h>
+
+struct drm_device;
+
+typedef void (*drmres_release_t)(struct drm_device *dev, void *res);
+
+#define drmm_add_action(dev, action, data) \
+ __drmm_add_action(dev, action, data, #action)
+
+int __must_check __drmm_add_action(struct drm_device *dev,
+ drmres_release_t action,
+ void *data, const char *name);
+
+void drmm_add_final_kfree(struct drm_device *dev, void *parent);
+
+void *drmm_kmalloc(struct drm_device *dev, size_t size, gfp_t gfp) __malloc;
+static inline void *drmm_kzalloc(struct drm_device *dev, size_t size, gfp_t gfp)
+{
+ return drmm_kmalloc(dev, size, gfp | __GFP_ZERO);
+}
+
+void drmm_kfree(struct drm_device *dev, void *data);
+
+#endif
projects / users / hch / xfs.git / commitdiff