diff options
| -rw-r--r-- | Documentation/gpu/drm-internals.rst | 6 | ||||
| -rw-r--r-- | drivers/gpu/drm/Makefile | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_drv.c | 15 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_internal.h | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/drm_managed.c | 193 | ||||
| -rw-r--r-- | include/drm/drm_device.h | 15 | ||||
| -rw-r--r-- | include/drm/drm_managed.h | 30 | ||||
| -rw-r--r-- | include/drm/drm_print.h | 6 |
8 files changed, 267 insertions, 4 deletions
diff --git a/Documentation/gpu/drm-internals.rst b/Documentation/gpu/drm-internals.rst index a73320576ca9..a6b6145fda78 100644 --- a/Documentation/gpu/drm-internals.rst +++ b/Documentation/gpu/drm-internals.rst @@ -132,6 +132,12 @@ be unmapped; on many devices, the ROM address decoder is shared with other BARs, so leaving it mapped could cause undesired behaviour like hangs or memory corruption. +Managed Resources +----------------- + +.. kernel-doc:: drivers/gpu/drm/drm_managed.c + :doc: managed resources + Bus-specific Device Registration and PCI Support ------------------------------------------------ diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index 7f72ef5e7811..183c60048307 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -17,7 +17,8 @@ drm-y := drm_auth.o drm_cache.o \ drm_plane.o drm_color_mgmt.o drm_print.o \ drm_dumb_buffers.o drm_mode_config.o drm_vblank.o \ drm_syncobj.o drm_lease.o drm_writeback.o drm_client.o \ - drm_client_modeset.o drm_atomic_uapi.o drm_hdcp.o + drm_client_modeset.o drm_atomic_uapi.o drm_hdcp.o \ + drm_managed.o drm-$(CONFIG_DRM_LEGACY) += drm_legacy_misc.o drm_bufs.o drm_context.o drm_dma.o drm_scatter.o drm_lock.o drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c index 65a0acb79323..a1884005d983 100644 --- a/drivers/gpu/drm/drm_drv.c +++ b/drivers/gpu/drm/drm_drv.c @@ -629,6 +629,9 @@ int drm_dev_init(struct drm_device *dev, dev->dev = get_device(parent); dev->driver = driver; + INIT_LIST_HEAD(&dev->managed.resources); + spin_lock_init(&dev->managed.lock); + /* no per-device feature limits by default */ dev->driver_features = ~0u; @@ -824,12 +827,18 @@ static void drm_dev_release(struct kref *ref) { struct drm_device *dev = container_of(ref, struct drm_device, ref); - if (dev->driver->release) { + if (dev->driver->release) dev->driver->release(dev); - } else { + else drm_dev_fini(dev); + + drm_managed_release(dev); + + if (!dev->driver->release && !dev->managed.final_kfree) { + WARN_ON(!list_empty(&dev->managed.resources)); kfree(dev); - } + } else if (dev->managed.final_kfree) + kfree(dev->managed.final_kfree); } /** diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index 8b9e8bbca9b1..23ba15773097 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -89,6 +89,9 @@ void drm_prime_remove_buf_handle_locked(struct drm_prime_file_private *prime_fpr struct drm_minor *drm_minor_acquire(unsigned int minor_id); void drm_minor_release(struct drm_minor *minor); +/* drm_managed.c */ +void drm_managed_release(struct drm_device *dev); + /* drm_vblank.c */ void drm_vblank_disable_and_save(struct drm_device *dev, unsigned int pipe); void drm_vblank_cleanup(struct drm_device *dev); diff --git a/drivers/gpu/drm/drm_managed.c b/drivers/gpu/drm/drm_managed.c new file mode 100644 index 000000000000..46d679b66e4d --- /dev/null +++ b/drivers/gpu/drm/drm_managed.c @@ -0,0 +1,193 @@ +// 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); diff --git a/include/drm/drm_device.h b/include/drm/drm_device.h index bb60a949f416..d39132b477dd 100644 --- a/include/drm/drm_device.h +++ b/include/drm/drm_device.h @@ -67,6 +67,21 @@ struct drm_device { /** @dev: Device structure of bus-device */ struct device *dev; + /** + * @managed: + * + * Managed resources linked to the lifetime of this &drm_device as + * tracked by @ref. + */ + struct { + /** @managed.resources: managed resources list */ + struct list_head resources; + /** @managed.final_kfree: pointer for final kfree() call */ + void *final_kfree; + /** @managed.lock: protects @managed.resources */ + spinlock_t lock; + } managed; + /** @driver: DRM driver managing the device */ struct drm_driver *driver; diff --git a/include/drm/drm_managed.h b/include/drm/drm_managed.h new file mode 100644 index 000000000000..7b5df7d09b19 --- /dev/null +++ b/include/drm/drm_managed.h @@ -0,0 +1,30 @@ +// 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 diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h index ca7cee8e728a..1c9417430d08 100644 --- a/include/drm/drm_print.h +++ b/include/drm/drm_print.h @@ -313,6 +313,10 @@ enum drm_debug_category { * @DRM_UT_DP: Used in the DP code. */ DRM_UT_DP = 0x100, + /** + * @DRM_UT_DRMRES: Used in the drm managed resources code. + */ + DRM_UT_DRMRES = 0x200, }; static inline bool drm_debug_enabled(enum drm_debug_category category) @@ -442,6 +446,8 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category, drm_dev_dbg((drm)->dev, DRM_UT_LEASE, fmt, ##__VA_ARGS__) #define drm_dbg_dp(drm, fmt, ...) \ drm_dev_dbg((drm)->dev, DRM_UT_DP, fmt, ##__VA_ARGS__) +#define drm_dbg_drmres(drm, fmt, ...) \ + drm_dev_dbg((drm)->dev, DRM_UT_DRMRES, fmt, ##__VA_ARGS__) /* |