mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Daniel Vetter](/assets/img/avatar_default.png)
We can now also delete drm_dev_init, now that vkms, vgem and i915 selftests are resolved. Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20200918132505.2316382-5-daniel.vetter@ffwll.ch
264 lines
6.7 KiB
C
264 lines
6.7 KiB
C
// 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);
|