Update Linux to v5.10.109
Sourced from [1]
[1] https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.10.109.tar.xz
Change-Id: I19bca9fc6762d4e63bcf3e4cba88bbe560d9c76c
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c
new file mode 100644
index 0000000..37d7db6
--- /dev/null
+++ b/drivers/gpu/drm/drm_managed.c
@@ -0,0 +1,264 @@
+// 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>
+
+#include "drm_internal.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.
+ *
+ * Release actions can be added with drmm_add_action(), memory allocations can
+ * be done directly with drmm_kmalloc() and the related functions. Everything
+ * will be released on the final drm_dev_put() in reverse order of how the
+ * release actions have been added and memory has been allocated since driver
+ * loading started with devm_drm_dev_alloc().
+ *
+ * Note that release actions and managed memory can also be added and removed
+ * during the lifetime of the driver, all the functions are fully concurrent
+ * safe. But it is recommended to use managed resources only for resources that
+ * change rarely, if ever, during the lifetime of the &drm_device instance.
+ */
+
+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;
+}
+
+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);
+
+int __drmm_add_action_or_reset(struct drm_device *dev,
+ drmres_release_t action,
+ void *data, const char *name)
+{
+ int ret;
+
+ ret = __drmm_add_action(dev, action, data, name);
+ if (ret)
+ action(dev, data);
+
+ return ret;
+}
+EXPORT_SYMBOL(__drmm_add_action_or_reset);
+
+/**
+ * drmm_kmalloc - &drm_device managed kmalloc()
+ * @dev: DRM device
+ * @size: size of the memory allocation
+ * @gfp: GFP allocation flags
+ *
+ * This is a &drm_device managed version of kmalloc(). The allocated memory is
+ * automatically freed on the final drm_dev_put(). Memory can also be freed
+ * before the final drm_dev_put() by calling drmm_kfree().
+ */
+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);
+
+/**
+ * drmm_kstrdup - &drm_device managed kstrdup()
+ * @dev: DRM device
+ * @s: 0-terminated string to be duplicated
+ * @gfp: GFP allocation flags
+ *
+ * This is a &drm_device managed version of kstrdup(). The allocated memory is
+ * automatically freed on the final drm_dev_put() and works exactly like a
+ * memory allocation obtained by drmm_kmalloc().
+ */
+char *drmm_kstrdup(struct drm_device *dev, const char *s, gfp_t gfp)
+{
+ size_t size;
+ char *buf;
+
+ if (!s)
+ return NULL;
+
+ size = strlen(s) + 1;
+ buf = drmm_kmalloc(dev, size, gfp);
+ if (buf)
+ memcpy(buf, s, size);
+ return buf;
+}
+EXPORT_SYMBOL_GPL(drmm_kstrdup);
+
+/**
+ * drmm_kfree - &drm_device managed kfree()
+ * @dev: DRM device
+ * @data: memory allocation to be freed
+ *
+ * This is a &drm_device managed version of kfree() which can be used to
+ * release memory allocated through drmm_kmalloc() or any of its related
+ * functions before the final drm_dev_put() of @dev.
+ */
+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);