On Fri, Dec 18, 2020 at 06:55:35PM +0100, Christian König wrote: > As far as I can tell the buffer_count was never used by an > userspace application. > > The number of BOs in the system is far better suited in > debugfs than sysfs and we now should be able to add other > information here as well. > > v2: add that additionally to sysfs > > Signed-off-by: Christian König <christian.koenig@xxxxxxx> > Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Not sure where I acked this, but looks reasonable. -Daniel > --- > drivers/gpu/drm/ttm/ttm_bo.c | 48 ++------------------------------ > drivers/gpu/drm/ttm/ttm_module.c | 4 +++ > drivers/gpu/drm/ttm/ttm_module.h | 6 ++-- > 3 files changed, 11 insertions(+), 47 deletions(-) > > diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c > index 31e8b3da5563..cd55e3104e50 100644 > --- a/drivers/gpu/drm/ttm/ttm_bo.c > +++ b/drivers/gpu/drm/ttm/ttm_bo.c > @@ -44,8 +44,6 @@ > > #include "ttm_module.h" > > -static void ttm_bo_global_kobj_release(struct kobject *kobj); > - > /* > * ttm_global_mutex - protecting the global BO state > */ > @@ -54,11 +52,6 @@ unsigned ttm_bo_glob_use_count; > struct ttm_bo_global ttm_bo_glob; > EXPORT_SYMBOL(ttm_bo_glob); > > -static struct attribute ttm_bo_count = { > - .name = "bo_count", > - .mode = S_IRUGO > -}; > - > /* default destructor */ > static void ttm_bo_default_destroy(struct ttm_buffer_object *bo) > { > @@ -84,32 +77,6 @@ static void ttm_bo_mem_space_debug(struct ttm_buffer_object *bo, > } > } > > -static ssize_t ttm_bo_global_show(struct kobject *kobj, > - struct attribute *attr, > - char *buffer) > -{ > - struct ttm_bo_global *glob = > - container_of(kobj, struct ttm_bo_global, kobj); > - > - return snprintf(buffer, PAGE_SIZE, "%d\n", > - atomic_read(&glob->bo_count)); > -} > - > -static struct attribute *ttm_bo_global_attrs[] = { > - &ttm_bo_count, > - NULL > -}; > - > -static const struct sysfs_ops ttm_bo_global_ops = { > - .show = &ttm_bo_global_show > -}; > - > -static struct kobj_type ttm_bo_glob_kobj_type = { > - .release = &ttm_bo_global_kobj_release, > - .sysfs_ops = &ttm_bo_global_ops, > - .default_attrs = ttm_bo_global_attrs > -}; > - > static void ttm_bo_del_from_lru(struct ttm_buffer_object *bo) > { > struct ttm_bo_device *bdev = bo->bdev; > @@ -1226,14 +1193,6 @@ size_t ttm_bo_dma_acc_size(struct ttm_bo_device *bdev, > } > EXPORT_SYMBOL(ttm_bo_dma_acc_size); > > -static void ttm_bo_global_kobj_release(struct kobject *kobj) > -{ > - struct ttm_bo_global *glob = > - container_of(kobj, struct ttm_bo_global, kobj); > - > - __free_page(glob->dummy_read_page); > -} > - > static void ttm_bo_global_release(void) > { > struct ttm_bo_global *glob = &ttm_bo_glob; > @@ -1245,6 +1204,7 @@ static void ttm_bo_global_release(void) > kobject_del(&glob->kobj); > kobject_put(&glob->kobj); > ttm_mem_global_release(&ttm_mem_glob); > + __free_page(glob->dummy_read_page); > memset(glob, 0, sizeof(*glob)); > out: > mutex_unlock(&ttm_global_mutex); > @@ -1277,10 +1237,8 @@ static int ttm_bo_global_init(void) > INIT_LIST_HEAD(&glob->device_list); > atomic_set(&glob->bo_count, 0); > > - ret = kobject_init_and_add( > - &glob->kobj, &ttm_bo_glob_kobj_type, ttm_get_kobj(), "buffer_objects"); > - if (unlikely(ret != 0)) > - kobject_put(&glob->kobj); > + debugfs_create_atomic_t("buffer_objects", 0444, ttm_debugfs_root, > + &glob->bo_count); > out: > mutex_unlock(&ttm_global_mutex); > return ret; > diff --git a/drivers/gpu/drm/ttm/ttm_module.c b/drivers/gpu/drm/ttm/ttm_module.c > index c0906437cb1c..f6566603a60f 100644 > --- a/drivers/gpu/drm/ttm/ttm_module.c > +++ b/drivers/gpu/drm/ttm/ttm_module.c > @@ -32,12 +32,14 @@ > #include <linux/module.h> > #include <linux/device.h> > #include <linux/sched.h> > +#include <linux/debugfs.h> > #include <drm/drm_sysfs.h> > > #include "ttm_module.h" > > static DECLARE_WAIT_QUEUE_HEAD(exit_q); > static atomic_t device_released; > +struct dentry *ttm_debugfs_root; > > static struct device_type ttm_drm_class_type = { > .name = "ttm", > @@ -77,6 +79,7 @@ static int __init ttm_init(void) > if (unlikely(ret != 0)) > goto out_no_dev_reg; > > + ttm_debugfs_root = debugfs_create_dir("ttm", NULL); > return 0; > out_no_dev_reg: > atomic_set(&device_released, 1); > @@ -94,6 +97,7 @@ static void __exit ttm_exit(void) > */ > > wait_event(exit_q, atomic_read(&device_released) == 1); > + debugfs_remove(ttm_debugfs_root); > } > > module_init(ttm_init); > diff --git a/drivers/gpu/drm/ttm/ttm_module.h b/drivers/gpu/drm/ttm/ttm_module.h > index 45fa318c1585..2f03c2fcf570 100644 > --- a/drivers/gpu/drm/ttm/ttm_module.h > +++ b/drivers/gpu/drm/ttm/ttm_module.h > @@ -31,10 +31,12 @@ > #ifndef _TTM_MODULE_H_ > #define _TTM_MODULE_H_ > > -#include <linux/kernel.h> > +#define TTM_PFX "[TTM] " > + > struct kobject; > +struct dentry; > > -#define TTM_PFX "[TTM] " > extern struct kobject *ttm_get_kobj(void); > +extern struct dentry *ttm_debugfs_root; > > #endif /* _TTM_MODULE_H_ */ > -- > 2.25.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel