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drm/panfrost: Add BO labelling to Panfrost

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Functions for labelling UM-exposed an internal BOs are provided. An
example of the latter would be the Perfcnt sample buffer.

This commit is done in preparation of a following one that will allow
UM to set BO labels through a new ioctl().

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20250520174634.353267-2-adrian.larumbe@collabora.com
This commit is contained in:
Adrián Larumbe 2025-05-20 18:43:58 +01:00 committed by Steven Price
parent 8395204aeb
commit e0e33f9bbb
2 changed files with 59 additions and 0 deletions
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42
drivers/gpu/drm/panfrost/panfrost_gem.c
View File

@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */
#include <linux/cleanup.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/dma-buf.h>
@ -35,6 +36,9 @@ static void panfrost_gem_free_object(struct drm_gem_object *obj)
*/
WARN_ON_ONCE(!list_empty(&bo->mappings.list));
kfree_const(bo->label.str);
mutex_destroy(&bo->label.lock);
if (bo->sgts) {
int i;
int n_sgt = bo->base.base.size / SZ_2M;
@ -260,6 +264,7 @@ struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t
mutex_init(&obj->mappings.lock);
obj->base.base.funcs = &panfrost_gem_funcs;
obj->base.map_wc = !pfdev->coherent;
mutex_init(&obj->label.lock);
return &obj->base.base;
}
@ -302,3 +307,40 @@ panfrost_gem_prime_import_sg_table(struct drm_device *dev,
return obj;
}
void
panfrost_gem_set_label(struct drm_gem_object *obj, const char *label)
{
struct panfrost_gem_object *bo = to_panfrost_bo(obj);
const char *old_label;
scoped_guard(mutex, &bo->label.lock) {
old_label = bo->label.str;
bo->label.str = label;
}
kfree_const(old_label);
}
void
panfrost_gem_internal_set_label(struct drm_gem_object *obj, const char *label)
{
struct panfrost_gem_object *bo = to_panfrost_bo(obj);
const char *str;
/* We should never attempt labelling a UM-exposed GEM object */
if (drm_WARN_ON(bo->base.base.dev, bo->base.base.handle_count > 0))
return;
if (!label)
return;
str = kstrdup_const(label, GFP_KERNEL);
if (!str) {
/* Failing to allocate memory for a label isn't a fatal condition */
drm_warn(bo->base.base.dev, "Not enough memory to allocate BO label");
return;
}
panfrost_gem_set_label(obj, str);
}

17
drivers/gpu/drm/panfrost/panfrost_gem.h
View File

@ -41,6 +41,20 @@ struct panfrost_gem_object {
*/
size_t heap_rss_size;
/**
* @label: BO tagging fields. The label can be assigned within the
* driver itself or through a specific IOCTL.
*/
struct {
/**
* @label.str: Pointer to NULL-terminated string,
*/
const char *str;
/** @lock.str: Protects access to the @label.str field. */
struct mutex lock;
} label;
bool noexec :1;
bool is_heap :1;
};
@ -89,4 +103,7 @@ void panfrost_gem_teardown_mappings_locked(struct panfrost_gem_object *bo);
int panfrost_gem_shrinker_init(struct drm_device *dev);
void panfrost_gem_shrinker_cleanup(struct drm_device *dev);
void panfrost_gem_set_label(struct drm_gem_object *obj, const char *label);
void panfrost_gem_internal_set_label(struct drm_gem_object *obj, const char *label);
#endif /* __PANFROST_GEM_H__ */