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.laru...@collabora.com>
Reviewed-by: Steven Price <steven.pr...@arm.com>
---
drivers/gpu/drm/panfrost/panfrost_gem.c | 42 +++++++++++++++++++++++++
drivers/gpu/drm/panfrost/panfrost_gem.h | 17 ++++++++++
2 files changed, 59 insertions(+)
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c
b/drivers/gpu/drm/panfrost/panfrost_gem.c
index 963f04ba2de6..4c5be7ccc9cc 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
@@ -1,6 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright 2019 Linaro, Ltd, Rob Herring <r...@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);
+}
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h
b/drivers/gpu/drm/panfrost/panfrost_gem.h
index 7516b7ecf7fe..6c187b9b66fc 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.h
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
@@ -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__ */
base-commit: 9ff4fdf4f44b69237c0afc1d3a8dac916ce66f3e
--
2.48.1
