From: Ville Syrjälä <[email protected]> The current attempted split between xe/i915 vs. display for intel_frontbuffer is a mess: - the i915 rcu leaks through the interface to the display side - the obj->frontbuffer write-side is now protected by a display specific spinlock even though the actual obj->framebuffer pointer lives in a i915 specific structure - the kref is getting poked directly from both sides - i915_active is still on the display side
Clean up the mess by moving everything about the frontbuffer lifetime management to the i915/xe side: - the rcu usage is now completely contained in i915 - frontbuffer_lock is moved into i915 - kref is on the i915/xe side (xe needs the refcount as well due to intel_frontbuffer_queue_flush()->intel_frontbuffer_ref()) - the bo (and its refcounting) is no longer on the display side - i915_active is contained in i915 I was pondering whether we could do this in some kind of smaller steps, and perhaps we could, but it would probably have to start with a bunch of reverts (which for sure won't go cleanly anymore). So not convinced it's worth the hassle. Signed-off-by: Ville Syrjälä <[email protected]> --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/display/intel_bo.c | 34 ++++-- drivers/gpu/drm/i915/display/intel_bo.h | 6 +- .../gpu/drm/i915/display/intel_display_core.h | 3 - .../drm/i915/display/intel_display_driver.c | 1 - .../gpu/drm/i915/display/intel_frontbuffer.c | 83 +++----------- .../gpu/drm/i915/display/intel_frontbuffer.h | 13 +-- drivers/gpu/drm/i915/gem/i915_gem_object.c | 12 +- .../i915/gem/i915_gem_object_frontbuffer.c | 103 ++++++++++++++++++ .../i915/gem/i915_gem_object_frontbuffer.h | 50 +++------ .../gpu/drm/i915/gem/i915_gem_object_types.h | 2 +- drivers/gpu/drm/i915/i915_drv.h | 2 + drivers/gpu/drm/i915/i915_gem.c | 2 + drivers/gpu/drm/i915/i915_vma.c | 6 +- .../gpu/drm/xe/compat-i915-headers/i915_vma.h | 2 - drivers/gpu/drm/xe/display/intel_bo.c | 52 ++++++++- 16 files changed, 228 insertions(+), 144 deletions(-) create mode 100644 drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.c diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 78a45a6681df..14062cb82158 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -150,6 +150,7 @@ gem-y += \ gem/i915_gem_lmem.o \ gem/i915_gem_mman.o \ gem/i915_gem_object.o \ + gem/i915_gem_object_frontbuffer.o \ gem/i915_gem_pages.o \ gem/i915_gem_phys.o \ gem/i915_gem_pm.o \ diff --git a/drivers/gpu/drm/i915/display/intel_bo.c b/drivers/gpu/drm/i915/display/intel_bo.c index 2792aca7bc22..f3687eb63467 100644 --- a/drivers/gpu/drm/i915/display/intel_bo.c +++ b/drivers/gpu/drm/i915/display/intel_bo.c @@ -39,20 +39,40 @@ int intel_bo_read_from_page(struct drm_gem_object *obj, u64 offset, void *dst, i return i915_gem_object_read_from_page(to_intel_bo(obj), offset, dst, size); } -struct intel_frontbuffer *intel_bo_get_frontbuffer(struct drm_gem_object *obj) +struct intel_frontbuffer *intel_bo_frontbuffer_get(struct drm_gem_object *_obj) { - return i915_gem_object_get_frontbuffer(to_intel_bo(obj)); + struct drm_i915_gem_object *obj = to_intel_bo(_obj); + struct i915_frontbuffer *front; + + front = i915_gem_object_frontbuffer_get(obj); + if (!front) + return NULL; + + return &front->base; +} + +void intel_bo_frontbuffer_ref(struct intel_frontbuffer *_front) +{ + struct i915_frontbuffer *front = + container_of(_front, typeof(*front), base); + + i915_gem_object_frontbuffer_ref(front); } -struct intel_frontbuffer *intel_bo_set_frontbuffer(struct drm_gem_object *obj, - struct intel_frontbuffer *front) +void intel_bo_frontbuffer_put(struct intel_frontbuffer *_front) { - return i915_gem_object_set_frontbuffer(to_intel_bo(obj), front); + struct i915_frontbuffer *front = + container_of(_front, typeof(*front), base); + + return i915_gem_object_frontbuffer_put(front); } -void intel_bo_frontbuffer_flush_for_display(struct intel_frontbuffer *front) +void intel_bo_frontbuffer_flush_for_display(struct intel_frontbuffer *_front) { - i915_gem_object_flush_if_display(to_intel_bo(front->obj)); + struct i915_frontbuffer *front = + container_of(_front, typeof(*front), base); + + i915_gem_object_flush_if_display(front->obj); } void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj) diff --git a/drivers/gpu/drm/i915/display/intel_bo.h b/drivers/gpu/drm/i915/display/intel_bo.h index 08247bf36d40..fc05f680dc76 100644 --- a/drivers/gpu/drm/i915/display/intel_bo.h +++ b/drivers/gpu/drm/i915/display/intel_bo.h @@ -19,9 +19,9 @@ bool intel_bo_is_protected(struct drm_gem_object *obj); int intel_bo_fb_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma); int intel_bo_read_from_page(struct drm_gem_object *obj, u64 offset, void *dst, int size); -struct intel_frontbuffer *intel_bo_get_frontbuffer(struct drm_gem_object *obj); -struct intel_frontbuffer *intel_bo_set_frontbuffer(struct drm_gem_object *obj, - struct intel_frontbuffer *front); +struct intel_frontbuffer *intel_bo_frontbuffer_get(struct drm_gem_object *obj); +void intel_bo_frontbuffer_ref(struct intel_frontbuffer *front); +void intel_bo_frontbuffer_put(struct intel_frontbuffer *front); void intel_bo_frontbuffer_flush_for_display(struct intel_frontbuffer *front); void intel_bo_describe(struct seq_file *m, struct drm_gem_object *obj); diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h index 13576d07c999..34d578e2cc25 100644 --- a/drivers/gpu/drm/i915/display/intel_display_core.h +++ b/drivers/gpu/drm/i915/display/intel_display_core.h @@ -141,9 +141,6 @@ struct intel_dpll_global { }; struct intel_frontbuffer_tracking { - /* protects obj->frontbuffer (write-side) */ - spinlock_t frontbuffer_lock; - /* protects busy_bits */ spinlock_t lock; diff --git a/drivers/gpu/drm/i915/display/intel_display_driver.c b/drivers/gpu/drm/i915/display/intel_display_driver.c index ac684f8c5d40..f84a0b26b7a6 100644 --- a/drivers/gpu/drm/i915/display/intel_display_driver.c +++ b/drivers/gpu/drm/i915/display/intel_display_driver.c @@ -184,7 +184,6 @@ void intel_display_driver_early_probe(struct intel_display *display) if (!HAS_DISPLAY(display)) return; - spin_lock_init(&display->fb_tracking.frontbuffer_lock); spin_lock_init(&display->fb_tracking.lock); mutex_init(&display->backlight.lock); mutex_init(&display->audio.mutex); diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.c b/drivers/gpu/drm/i915/display/intel_frontbuffer.c index abe7d29781e1..4761e116e442 100644 --- a/drivers/gpu/drm/i915/display/intel_frontbuffer.c +++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.c @@ -57,8 +57,6 @@ #include <drm/drm_gem.h> -#include "i915_active.h" -#include "i915_vma.h" #include "intel_bo.h" #include "intel_display_trace.h" #include "intel_display_types.h" @@ -167,7 +165,7 @@ void __intel_fb_flush(struct intel_frontbuffer *front, static void intel_frontbuffer_ref(struct intel_frontbuffer *front) { - kref_get(&front->ref); + intel_bo_frontbuffer_ref(front); } static void intel_frontbuffer_flush_work(struct work_struct *work) @@ -196,81 +194,26 @@ void intel_frontbuffer_queue_flush(struct intel_frontbuffer *front) intel_frontbuffer_put(front); } -static int frontbuffer_active(struct i915_active *ref) +void intel_frontbuffer_init(struct intel_frontbuffer *front, struct drm_device *drm) { - struct intel_frontbuffer *front = - container_of(ref, typeof(*front), write); - - kref_get(&front->ref); - return 0; -} - -static void frontbuffer_retire(struct i915_active *ref) -{ - struct intel_frontbuffer *front = - container_of(ref, typeof(*front), write); - - intel_frontbuffer_flush(front, ORIGIN_CS); - intel_frontbuffer_put(front); -} - -static void frontbuffer_release(struct kref *ref) - __releases(&front->display->fb_tracking.frontbuffer_lock) -{ - struct intel_frontbuffer *ret, *front = - container_of(ref, typeof(*front), ref); - struct intel_display *display = front->display; - struct drm_gem_object *obj = front->obj; - - drm_WARN_ON(display->drm, atomic_read(&front->bits)); - - i915_ggtt_clear_scanout(to_intel_bo(obj)); - - ret = intel_bo_set_frontbuffer(obj, NULL); - drm_WARN_ON(display->drm, ret); - spin_unlock(&display->fb_tracking.frontbuffer_lock); - - i915_active_fini(&front->write); - kfree_rcu(front, rcu); -} - -struct intel_frontbuffer * -intel_frontbuffer_get(struct drm_gem_object *obj) -{ - struct intel_display *display = to_intel_display(obj->dev); - struct intel_frontbuffer *front, *cur; - - front = intel_bo_get_frontbuffer(obj); - if (front) - return front; - - front = kmalloc(sizeof(*front), GFP_KERNEL); - if (!front) - return NULL; - - front->display = display; - front->obj = obj; - kref_init(&front->ref); + front->display = to_intel_display(drm); atomic_set(&front->bits, 0); - i915_active_init(&front->write, - frontbuffer_active, - frontbuffer_retire, - I915_ACTIVE_RETIRE_SLEEPS); INIT_WORK(&front->flush_work, intel_frontbuffer_flush_work); +} - spin_lock(&display->fb_tracking.frontbuffer_lock); - cur = intel_bo_set_frontbuffer(obj, front); - spin_unlock(&display->fb_tracking.frontbuffer_lock); - if (cur != front) - kfree(front); - return cur; +void intel_frontbuffer_fini(struct intel_frontbuffer *front) +{ + drm_WARN_ON(front->display->drm, atomic_read(&front->bits)); +} + +struct intel_frontbuffer *intel_frontbuffer_get(struct drm_gem_object *obj) +{ + return intel_bo_frontbuffer_get(obj); } void intel_frontbuffer_put(struct intel_frontbuffer *front) { - kref_put_lock(&front->ref, - frontbuffer_release, - &front->display->fb_tracking.frontbuffer_lock); + intel_bo_frontbuffer_put(front); } /** diff --git a/drivers/gpu/drm/i915/display/intel_frontbuffer.h b/drivers/gpu/drm/i915/display/intel_frontbuffer.h index ff2a6ac75a34..22677acb4c06 100644 --- a/drivers/gpu/drm/i915/display/intel_frontbuffer.h +++ b/drivers/gpu/drm/i915/display/intel_frontbuffer.h @@ -26,10 +26,9 @@ #include <linux/atomic.h> #include <linux/bits.h> -#include <linux/kref.h> - -#include "i915_active_types.h" +#include <linux/workqueue_types.h> +struct drm_device; struct drm_gem_object; struct intel_display; @@ -42,13 +41,8 @@ enum fb_op_origin { }; struct intel_frontbuffer { - struct kref ref; struct intel_display *display; atomic_t bits; - struct i915_active write; - struct drm_gem_object *obj; - struct rcu_head rcu; - struct work_struct flush_work; }; @@ -141,4 +135,7 @@ void intel_frontbuffer_track(struct intel_frontbuffer *old, struct intel_frontbuffer *new, unsigned int frontbuffer_bits); +void intel_frontbuffer_init(struct intel_frontbuffer *front, struct drm_device *drm); +void intel_frontbuffer_fini(struct intel_frontbuffer *front); + #endif /* __INTEL_FRONTBUFFER_H__ */ diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c index 478011e5ecb3..36680eddf88e 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c @@ -476,24 +476,24 @@ static void i915_gem_free_object(struct drm_gem_object *gem_obj) void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj, enum fb_op_origin origin) { - struct intel_frontbuffer *front; + struct i915_frontbuffer *front; front = i915_gem_object_get_frontbuffer(obj); if (front) { - intel_frontbuffer_flush(front, origin); - intel_frontbuffer_put(front); + intel_frontbuffer_flush(&front->base, origin); + i915_gem_object_frontbuffer_put(front); } } void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, enum fb_op_origin origin) { - struct intel_frontbuffer *front; + struct i915_frontbuffer *front; front = i915_gem_object_get_frontbuffer(obj); if (front) { - intel_frontbuffer_invalidate(front, origin); - intel_frontbuffer_put(front); + intel_frontbuffer_invalidate(&front->base, origin); + i915_gem_object_frontbuffer_put(front); } } diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.c new file mode 100644 index 000000000000..7ef89613c025 --- /dev/null +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: MIT +/* Copyright © 2025 Intel Corporation */ + +#include "i915_drv.h" +#include "i915_gem_object_frontbuffer.h" + +static int frontbuffer_active(struct i915_active *ref) +{ + struct i915_frontbuffer *front = + container_of(ref, typeof(*front), write); + + kref_get(&front->ref); + return 0; +} + +static void frontbuffer_retire(struct i915_active *ref) +{ + struct i915_frontbuffer *front = + container_of(ref, typeof(*front), write); + + intel_frontbuffer_flush(&front->base, ORIGIN_CS); + i915_gem_object_frontbuffer_put(front); +} + +struct i915_frontbuffer * +i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_frontbuffer *front, *cur; + + front = i915_gem_object_get_frontbuffer(obj); + if (front) + return front; + + front = kmalloc(sizeof(*front), GFP_KERNEL); + if (!front) + return NULL; + + intel_frontbuffer_init(&front->base, &i915->drm); + + kref_init(&front->ref); + i915_gem_object_get(obj); + front->obj = obj; + + i915_active_init(&front->write, + frontbuffer_active, + frontbuffer_retire, + I915_ACTIVE_RETIRE_SLEEPS); + + spin_lock(&i915->frontbuffer_lock); + if (rcu_access_pointer(obj->frontbuffer)) { + cur = rcu_dereference_protected(obj->frontbuffer, true); + kref_get(&cur->ref); + } else { + cur = front; + rcu_assign_pointer(obj->frontbuffer, front); + } + spin_unlock(&i915->frontbuffer_lock); + + if (cur != front) { + i915_gem_object_put(obj); + intel_frontbuffer_fini(&front->base); + kfree(front); + } + + return cur; +} + +void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front) +{ + kref_get(&front->ref); +} + +static void frontbuffer_release(struct kref *ref) + __releases(&i915->frontbuffer_lock) +{ + struct i915_frontbuffer *front = + container_of(ref, typeof(*front), ref); + struct drm_i915_gem_object *obj = front->obj; + struct drm_i915_private *i915 = to_i915(obj->base.dev); + + i915_ggtt_clear_scanout(obj); + + RCU_INIT_POINTER(obj->frontbuffer, NULL); + + spin_unlock(&i915->frontbuffer_lock); + + i915_active_fini(&front->write); + + i915_gem_object_put(obj); + + intel_frontbuffer_fini(&front->base); + + kfree_rcu(front, rcu); +} + +void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front) +{ + struct drm_i915_private *i915 = to_i915(front->obj->base.dev); + + kref_put_lock(&front->ref, frontbuffer_release, + &i915->frontbuffer_lock); +} diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h b/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h index 84f82c2289a8..385f7e8049b8 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_frontbuffer.h @@ -12,6 +12,14 @@ #include "display/intel_frontbuffer.h" #include "i915_gem_object_types.h" +struct i915_frontbuffer { + struct intel_frontbuffer base; + struct drm_i915_gem_object *obj; + struct i915_active write; + struct rcu_head rcu; + struct kref ref; +}; + void __i915_gem_object_flush_frontbuffer(struct drm_i915_gem_object *obj, enum fb_op_origin origin); void __i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, @@ -33,6 +41,10 @@ i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, __i915_gem_object_invalidate_frontbuffer(obj, origin); } +struct i915_frontbuffer *i915_gem_object_frontbuffer_get(struct drm_i915_gem_object *obj); +void i915_gem_object_frontbuffer_ref(struct i915_frontbuffer *front); +void i915_gem_object_frontbuffer_put(struct i915_frontbuffer *front); + /** * i915_gem_object_get_frontbuffer - Get the object's frontbuffer * @obj: The object whose frontbuffer to get. @@ -42,10 +54,10 @@ i915_gem_object_invalidate_frontbuffer(struct drm_i915_gem_object *obj, * * Return: pointer to object's frontbuffer is such exists or NULL */ -static inline struct intel_frontbuffer * +static inline struct i915_frontbuffer * i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj) { - struct intel_frontbuffer *front; + struct i915_frontbuffer *front; if (likely(!rcu_access_pointer(obj->frontbuffer))) return NULL; @@ -62,43 +74,11 @@ i915_gem_object_get_frontbuffer(const struct drm_i915_gem_object *obj) if (likely(front == rcu_access_pointer(obj->frontbuffer))) break; - intel_frontbuffer_put(front); + i915_gem_object_frontbuffer_put(front); } while (1); rcu_read_unlock(); return front; } -/** - * i915_gem_object_set_frontbuffer - Set the object's frontbuffer - * @obj: The object whose frontbuffer to set. - * @front: The frontbuffer to set - * - * Set object's frontbuffer pointer. If frontbuffer is already set for the - * object keep it and return it's pointer to the caller. Please note that RCU - * mechanism is used to handle e.g. ongoing removal of frontbuffer pointer. This - * function is protected by i915->display->fb_tracking.frontbuffer_lock - * - * Return: pointer to frontbuffer which was set. - */ -static inline struct intel_frontbuffer * -i915_gem_object_set_frontbuffer(struct drm_i915_gem_object *obj, - struct intel_frontbuffer *front) -{ - struct intel_frontbuffer *cur = front; - - if (!front) { - RCU_INIT_POINTER(obj->frontbuffer, NULL); - drm_gem_object_put(intel_bo_to_drm_bo(obj)); - } else if (rcu_access_pointer(obj->frontbuffer)) { - cur = rcu_dereference_protected(obj->frontbuffer, true); - kref_get(&cur->ref); - } else { - drm_gem_object_get(intel_bo_to_drm_bo(obj)); - rcu_assign_pointer(obj->frontbuffer, front); - } - - return cur; -} - #endif diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h index 64600aa8227f..465ce94aee76 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h @@ -574,7 +574,7 @@ struct drm_i915_gem_object { */ u16 write_domain; - struct intel_frontbuffer __rcu *frontbuffer; + struct i915_frontbuffer __rcu *frontbuffer; /** Current tiling stride for the object, if it's tiled. */ unsigned int tiling_and_stride; diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 6e159bb8ad2f..9ef9bc8f597a 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -311,6 +311,8 @@ struct drm_i915_private { struct file *mmap_singleton; } gem; + spinlock_t frontbuffer_lock; /* protects obj->frontbuffer (write-side) */ + struct intel_pxp *pxp; struct i915_pmu pmu; diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index e14a0c3db999..39b747c3e223 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -1298,6 +1298,8 @@ void i915_gem_init_early(struct drm_i915_private *dev_priv) { i915_gem_init__mm(dev_priv); i915_gem_init__contexts(dev_priv); + + spin_lock_init(&dev_priv->frontbuffer_lock); } void i915_gem_cleanup_early(struct drm_i915_private *dev_priv) diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c index 25e97031d76e..cb36daaa101d 100644 --- a/drivers/gpu/drm/i915/i915_vma.c +++ b/drivers/gpu/drm/i915/i915_vma.c @@ -1990,13 +1990,13 @@ int _i915_vma_move_to_active(struct i915_vma *vma, } if (flags & EXEC_OBJECT_WRITE) { - struct intel_frontbuffer *front; + struct i915_frontbuffer *front; front = i915_gem_object_get_frontbuffer(obj); if (unlikely(front)) { - if (intel_frontbuffer_invalidate(front, ORIGIN_CS)) + if (intel_frontbuffer_invalidate(&front->base, ORIGIN_CS)) i915_active_add_request(&front->write, rq); - intel_frontbuffer_put(front); + i915_gem_object_frontbuffer_put(front); } } diff --git a/drivers/gpu/drm/xe/compat-i915-headers/i915_vma.h b/drivers/gpu/drm/xe/compat-i915-headers/i915_vma.h index 4465c40f8134..b17e3bab23d5 100644 --- a/drivers/gpu/drm/xe/compat-i915-headers/i915_vma.h +++ b/drivers/gpu/drm/xe/compat-i915-headers/i915_vma.h @@ -26,8 +26,6 @@ struct i915_vma { struct xe_ggtt_node *node; }; -#define i915_ggtt_clear_scanout(bo) do { } while (0) - #define i915_vma_fence_id(vma) -1 static inline u32 i915_ggtt_offset(const struct i915_vma *vma) diff --git a/drivers/gpu/drm/xe/display/intel_bo.c b/drivers/gpu/drm/xe/display/intel_bo.c index 2437c00a2d3e..bad2243b9114 100644 --- a/drivers/gpu/drm/xe/display/intel_bo.c +++ b/drivers/gpu/drm/xe/display/intel_bo.c @@ -5,6 +5,7 @@ #include "xe_bo.h" #include "intel_bo.h" +#include "intel_frontbuffer.h" bool intel_bo_is_tiled(struct drm_gem_object *obj) { @@ -40,15 +41,56 @@ int intel_bo_read_from_page(struct drm_gem_object *obj, u64 offset, void *dst, i return xe_bo_read(bo, offset, dst, size); } -struct intel_frontbuffer *intel_bo_get_frontbuffer(struct drm_gem_object *obj) +struct xe_frontbuffer { + struct intel_frontbuffer base; + struct drm_gem_object *obj; + struct kref ref; +}; + +struct intel_frontbuffer *intel_bo_frontbuffer_get(struct drm_gem_object *obj) { - return NULL; + struct xe_frontbuffer *front; + + front = kmalloc(sizeof(*front), GFP_KERNEL); + if (!front) + return NULL; + + intel_frontbuffer_init(&front->base, obj->dev); + + kref_init(&front->ref); + + drm_gem_object_get(obj); + front->obj = obj; + + return &front->base; } -struct intel_frontbuffer *intel_bo_set_frontbuffer(struct drm_gem_object *obj, - struct intel_frontbuffer *front) +void intel_bo_frontbuffer_ref(struct intel_frontbuffer *_front) { - return front; + struct xe_frontbuffer *front = + container_of(_front, typeof(*front), base); + + kref_get(&front->ref); +} + +static void frontbuffer_release(struct kref *ref) +{ + struct xe_frontbuffer *front = + container_of(ref, typeof(*front), ref); + + intel_frontbuffer_fini(&front->base); + + drm_gem_object_put(front->obj); + + kfree(front); +} + +void intel_bo_frontbuffer_put(struct intel_frontbuffer *_front) +{ + struct xe_frontbuffer *front = + container_of(_front, typeof(*front), base); + + kref_put(&front->ref, frontbuffer_release); } void intel_bo_frontbuffer_flush_for_display(struct intel_frontbuffer *front) -- 2.49.1
