* [PATCH] drm/gem: Drop ticket arg to lru_scan()
@ 2026-08-31 17:44 Rob Clark
2026-09-01 7:26 ` Boris Brezillon
2026-09-01 16:31 ` Liviu Dudau
0 siblings, 2 replies; 3+ messages in thread
From: Rob Clark @ 2026-08-31 17:44 UTC (permalink / raw)
To: dri-devel
Cc: Rob Clark, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann,
David Airlie, Simona Vetter, Dmitry Baryshkov, Abhinav Kumar,
Jessica Zhang, Sean Paul, Marijn Suijten, Boris Brezillon,
Steven Price, Liviu Dudau, open list,
open list:DRM DRIVER for Qualcomm display hardware,
open list:DRM DRIVER for Qualcomm display hardware
Commit 3392291fc509 ("drm/msm: Fix shrinker deadlock") dropped the only
use of the ticket arg, but at the time left drm_gem_lru_scan() unchanged
to avoid conflicts with in-flight pathor shrinker support. This commit
is the followup to remove the unused arg.
Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
---
drivers/gpu/drm/drm_gem.c | 13 +++----------
drivers/gpu/drm/msm/msm_gem_shrinker.c | 22 ++++++++++------------
drivers/gpu/drm/panthor/panthor_gem.c | 14 ++++++--------
drivers/gpu/drm/panthor/panthor_mmu.c | 5 ++---
drivers/gpu/drm/panthor/panthor_mmu.h | 3 +--
include/drm/drm_gem.h | 3 +--
6 files changed, 23 insertions(+), 37 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index e3ed684ddcf2..15acb958ecd5 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -1656,8 +1656,7 @@ drm_gem_lru_scan(struct drm_device *dev,
struct drm_gem_lru *lru,
unsigned int nr_to_scan,
unsigned long *remaining,
- bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
- struct ww_acquire_ctx *ticket)
+ bool (*shrink)(struct drm_gem_object *obj))
{
struct drm_gem_lru still_in_lru;
struct drm_gem_object *obj;
@@ -1690,20 +1689,17 @@ drm_gem_lru_scan(struct drm_device *dev,
*/
mutex_unlock(&dev->gem_lru_mutex);
- if (ticket)
- ww_acquire_init(ticket, &reservation_ww_class);
-
/*
* Note that this still needs to be trylock, since we can
* hit shrinker in response to trying to get backing pages
* for this obj (ie. while it's lock is already held)
*/
- if (!ww_mutex_trylock(&obj->resv->lock, ticket)) {
+ if (!ww_mutex_trylock(&obj->resv->lock, NULL)) {
*remaining += obj->size >> PAGE_SHIFT;
goto tail;
}
- if (shrink(obj, ticket)) {
+ if (shrink(obj)) {
freed += obj->size >> PAGE_SHIFT;
/*
@@ -1727,9 +1723,6 @@ drm_gem_lru_scan(struct drm_device *dev,
dma_resv_unlock(obj->resv);
- if (ticket)
- ww_acquire_fini(ticket);
-
tail:
drm_gem_object_put(obj);
mutex_lock(&dev->gem_lru_mutex);
diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
index 9d2788f79ace..3514d5c84989 100644
--- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
+++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
@@ -102,7 +102,7 @@ with_vm_locks(void (*fn)(struct drm_gem_object *obj),
}
static bool
-purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
+purge(struct drm_gem_object *obj)
{
if (!is_purgeable(to_msm_bo(obj)))
return false;
@@ -114,7 +114,7 @@ purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
}
static bool
-evict(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
+evict(struct drm_gem_object *obj)
{
if (is_unevictable(to_msm_bo(obj)))
return false;
@@ -133,21 +133,21 @@ wait_for_idle(struct drm_gem_object *obj)
}
static bool
-active_purge(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
+active_purge(struct drm_gem_object *obj)
{
if (!wait_for_idle(obj))
return false;
- return purge(obj, ticket);
+ return purge(obj);
}
static bool
-active_evict(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
+active_evict(struct drm_gem_object *obj)
{
if (!wait_for_idle(obj))
return false;
- return evict(obj, ticket);
+ return evict(obj);
}
static unsigned long
@@ -156,7 +156,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
struct msm_drm_private *priv = shrinker->private_data;
struct {
struct drm_gem_lru *lru;
- bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket);
+ bool (*shrink)(struct drm_gem_object *obj);
bool cond;
unsigned long freed;
unsigned long remaining;
@@ -180,8 +180,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
stages[i].freed =
drm_gem_lru_scan(priv->dev, stages[i].lru, nr,
&stages[i].remaining,
- stages[i].shrink,
- NULL);
+ stages[i].shrink);
nr -= stages[i].freed;
freed += stages[i].freed;
remaining += stages[i].remaining;
@@ -222,7 +221,7 @@ msm_gem_shrinker_shrink(struct drm_device *dev, unsigned long nr_to_scan)
static const int vmap_shrink_limit = 15;
static bool
-vmap_shrink(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
+vmap_shrink(struct drm_gem_object *obj)
{
if (!is_vunmapable(to_msm_bo(obj)))
return false;
@@ -250,8 +249,7 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
unmapped += drm_gem_lru_scan(priv->dev, lrus[idx],
vmap_shrink_limit - unmapped,
&remaining,
- vmap_shrink,
- NULL);
+ vmap_shrink);
}
*(unsigned long *)ptr += unmapped;
diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
index 54535bae2b0c..17408f832af3 100644
--- a/drivers/gpu/drm/panthor/panthor_gem.c
+++ b/drivers/gpu/drm/panthor/panthor_gem.c
@@ -1392,8 +1392,7 @@ panthor_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
return count ? count : SHRINK_EMPTY;
}
-static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj,
- struct ww_acquire_ctx *ticket)
+static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj)
{
/*
* Track last locked entry for unwinding locks in error and
@@ -1479,8 +1478,7 @@ static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj,
return ret == 0;
}
-static bool panthor_gem_try_evict(struct drm_gem_object *obj,
- struct ww_acquire_ctx *ticket)
+static bool panthor_gem_try_evict(struct drm_gem_object *obj)
{
struct panthor_gem_object *bo = to_panthor_bo(obj);
@@ -1488,7 +1486,7 @@ static bool panthor_gem_try_evict(struct drm_gem_object *obj,
if (dma_resv_wait_timeout(obj->resv, DMA_RESV_USAGE_BOOKKEEP, false, 10) <= 0)
return false;
- return panthor_gem_try_evict_no_resv_wait(&bo->base, ticket);
+ return panthor_gem_try_evict_no_resv_wait(&bo->base);
}
static unsigned long
@@ -1503,13 +1501,13 @@ panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.unused,
sc->nr_to_scan - freed, &remaining,
- panthor_gem_try_evict_no_resv_wait, NULL);
+ panthor_gem_try_evict_no_resv_wait);
if (freed >= sc->nr_to_scan)
goto out;
freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.mmapped,
sc->nr_to_scan - freed, &remaining,
- panthor_gem_try_evict_no_resv_wait, NULL);
+ panthor_gem_try_evict_no_resv_wait);
if (freed >= sc->nr_to_scan)
goto out;
@@ -1523,7 +1521,7 @@ panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.gpu_mapped_shared,
sc->nr_to_scan - freed, &remaining,
- panthor_gem_try_evict, NULL);
+ panthor_gem_try_evict);
out:
#ifdef CONFIG_DEBUG_FS
diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c
index e10dbd18d8cf..ab070bc74857 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.c
+++ b/drivers/gpu/drm/panthor/panthor_mmu.c
@@ -3133,8 +3133,7 @@ int panthor_vm_prepare_mapped_bos_resvs(struct drm_exec *exec, struct panthor_vm
unsigned long
panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
unsigned int nr_to_scan, unsigned long *remaining,
- bool (*shrink)(struct drm_gem_object *,
- struct ww_acquire_ctx *))
+ bool (*shrink)(struct drm_gem_object *))
{
unsigned long freed = 0;
LIST_HEAD(remaining_vms);
@@ -3160,7 +3159,7 @@ panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
freed += drm_gem_lru_scan(&ptdev->base, &vm->reclaim.lru,
nr_to_scan - freed,
- remaining, shrink, NULL);
+ remaining, shrink);
mutex_lock(&ptdev->base.gem_lru_mutex);
diff --git a/drivers/gpu/drm/panthor/panthor_mmu.h b/drivers/gpu/drm/panthor/panthor_mmu.h
index 3522fbbce369..abc36e7204be 100644
--- a/drivers/gpu/drm/panthor/panthor_mmu.h
+++ b/drivers/gpu/drm/panthor/panthor_mmu.h
@@ -52,8 +52,7 @@ int panthor_vm_evict_bo_mappings_locked(struct panthor_gem_object *bo);
unsigned long
panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
unsigned int nr_to_scan, unsigned long *remaining,
- bool (*shrink)(struct drm_gem_object *,
- struct ww_acquire_ctx *));
+ bool (*shrink)(struct drm_gem_object *));
int panthor_vm_prepare_mapped_bos_resvs(struct drm_exec *exec,
struct panthor_vm *vm,
u32 slot_count);
diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
index 8a704f6a65c1..ffa607c91aa2 100644
--- a/include/drm/drm_gem.h
+++ b/include/drm/drm_gem.h
@@ -616,8 +616,7 @@ drm_gem_lru_scan(struct drm_device *dev,
struct drm_gem_lru *lru,
unsigned int nr_to_scan,
unsigned long *remaining,
- bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
- struct ww_acquire_ctx *ticket);
+ bool (*shrink)(struct drm_gem_object *obj));
int drm_gem_evict_locked(struct drm_gem_object *obj);
--
2.55.0
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] drm/gem: Drop ticket arg to lru_scan()
2026-08-31 17:44 [PATCH] drm/gem: Drop ticket arg to lru_scan() Rob Clark
@ 2026-09-01 7:26 ` Boris Brezillon
2026-09-01 16:31 ` Liviu Dudau
1 sibling, 0 replies; 3+ messages in thread
From: Boris Brezillon @ 2026-09-01 7:26 UTC (permalink / raw)
To: Rob Clark
Cc: dri-devel, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann,
David Airlie, Simona Vetter, Dmitry Baryshkov, Abhinav Kumar,
Jessica Zhang, Sean Paul, Marijn Suijten, Steven Price,
Liviu Dudau, open list,
open list:DRM DRIVER for Qualcomm display hardware,
open list:DRM DRIVER for Qualcomm display hardware
On Mon, 31 Aug 2026 10:44:08 -0700
Rob Clark <robin.clark@oss.qualcomm.com> wrote:
> Commit 3392291fc509 ("drm/msm: Fix shrinker deadlock") dropped the only
> use of the ticket arg, but at the time left drm_gem_lru_scan() unchanged
> to avoid conflicts with in-flight pathor shrinker support. This commit
^ panthor
> is the followup to remove the unused arg.
>
> Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
> ---
> drivers/gpu/drm/drm_gem.c | 13 +++----------
> drivers/gpu/drm/msm/msm_gem_shrinker.c | 22 ++++++++++------------
> drivers/gpu/drm/panthor/panthor_gem.c | 14 ++++++--------
> drivers/gpu/drm/panthor/panthor_mmu.c | 5 ++---
> drivers/gpu/drm/panthor/panthor_mmu.h | 3 +--
> include/drm/drm_gem.h | 3 +--
> 6 files changed, 23 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index e3ed684ddcf2..15acb958ecd5 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -1656,8 +1656,7 @@ drm_gem_lru_scan(struct drm_device *dev,
> struct drm_gem_lru *lru,
> unsigned int nr_to_scan,
> unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
> - struct ww_acquire_ctx *ticket)
> + bool (*shrink)(struct drm_gem_object *obj))
> {
> struct drm_gem_lru still_in_lru;
> struct drm_gem_object *obj;
> @@ -1690,20 +1689,17 @@ drm_gem_lru_scan(struct drm_device *dev,
> */
> mutex_unlock(&dev->gem_lru_mutex);
>
> - if (ticket)
> - ww_acquire_init(ticket, &reservation_ww_class);
> -
> /*
> * Note that this still needs to be trylock, since we can
> * hit shrinker in response to trying to get backing pages
> * for this obj (ie. while it's lock is already held)
> */
> - if (!ww_mutex_trylock(&obj->resv->lock, ticket)) {
> + if (!ww_mutex_trylock(&obj->resv->lock, NULL)) {
> *remaining += obj->size >> PAGE_SHIFT;
> goto tail;
> }
>
> - if (shrink(obj, ticket)) {
> + if (shrink(obj)) {
> freed += obj->size >> PAGE_SHIFT;
>
> /*
> @@ -1727,9 +1723,6 @@ drm_gem_lru_scan(struct drm_device *dev,
>
> dma_resv_unlock(obj->resv);
>
> - if (ticket)
> - ww_acquire_fini(ticket);
> -
> tail:
> drm_gem_object_put(obj);
> mutex_lock(&dev->gem_lru_mutex);
> diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
> index 9d2788f79ace..3514d5c84989 100644
> --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
> +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
> @@ -102,7 +102,7 @@ with_vm_locks(void (*fn)(struct drm_gem_object *obj),
> }
>
> static bool
> -purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
> +purge(struct drm_gem_object *obj)
> {
> if (!is_purgeable(to_msm_bo(obj)))
> return false;
> @@ -114,7 +114,7 @@ purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
> }
>
> static bool
> -evict(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
> +evict(struct drm_gem_object *obj)
> {
> if (is_unevictable(to_msm_bo(obj)))
> return false;
> @@ -133,21 +133,21 @@ wait_for_idle(struct drm_gem_object *obj)
> }
>
> static bool
> -active_purge(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
> +active_purge(struct drm_gem_object *obj)
> {
> if (!wait_for_idle(obj))
> return false;
>
> - return purge(obj, ticket);
> + return purge(obj);
> }
>
> static bool
> -active_evict(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
> +active_evict(struct drm_gem_object *obj)
> {
> if (!wait_for_idle(obj))
> return false;
>
> - return evict(obj, ticket);
> + return evict(obj);
> }
>
> static unsigned long
> @@ -156,7 +156,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
> struct msm_drm_private *priv = shrinker->private_data;
> struct {
> struct drm_gem_lru *lru;
> - bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket);
> + bool (*shrink)(struct drm_gem_object *obj);
> bool cond;
> unsigned long freed;
> unsigned long remaining;
> @@ -180,8 +180,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
> stages[i].freed =
> drm_gem_lru_scan(priv->dev, stages[i].lru, nr,
> &stages[i].remaining,
> - stages[i].shrink,
> - NULL);
> + stages[i].shrink);
> nr -= stages[i].freed;
> freed += stages[i].freed;
> remaining += stages[i].remaining;
> @@ -222,7 +221,7 @@ msm_gem_shrinker_shrink(struct drm_device *dev, unsigned long nr_to_scan)
> static const int vmap_shrink_limit = 15;
>
> static bool
> -vmap_shrink(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
> +vmap_shrink(struct drm_gem_object *obj)
> {
> if (!is_vunmapable(to_msm_bo(obj)))
> return false;
> @@ -250,8 +249,7 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
> unmapped += drm_gem_lru_scan(priv->dev, lrus[idx],
> vmap_shrink_limit - unmapped,
> &remaining,
> - vmap_shrink,
> - NULL);
> + vmap_shrink);
> }
>
> *(unsigned long *)ptr += unmapped;
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
> index 54535bae2b0c..17408f832af3 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.c
> +++ b/drivers/gpu/drm/panthor/panthor_gem.c
> @@ -1392,8 +1392,7 @@ panthor_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
> return count ? count : SHRINK_EMPTY;
> }
>
> -static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj,
> - struct ww_acquire_ctx *ticket)
> +static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj)
> {
> /*
> * Track last locked entry for unwinding locks in error and
> @@ -1479,8 +1478,7 @@ static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj,
> return ret == 0;
> }
>
> -static bool panthor_gem_try_evict(struct drm_gem_object *obj,
> - struct ww_acquire_ctx *ticket)
> +static bool panthor_gem_try_evict(struct drm_gem_object *obj)
> {
> struct panthor_gem_object *bo = to_panthor_bo(obj);
>
> @@ -1488,7 +1486,7 @@ static bool panthor_gem_try_evict(struct drm_gem_object *obj,
> if (dma_resv_wait_timeout(obj->resv, DMA_RESV_USAGE_BOOKKEEP, false, 10) <= 0)
> return false;
>
> - return panthor_gem_try_evict_no_resv_wait(&bo->base, ticket);
> + return panthor_gem_try_evict_no_resv_wait(&bo->base);
> }
>
> static unsigned long
> @@ -1503,13 +1501,13 @@ panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
>
> freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.unused,
> sc->nr_to_scan - freed, &remaining,
> - panthor_gem_try_evict_no_resv_wait, NULL);
> + panthor_gem_try_evict_no_resv_wait);
> if (freed >= sc->nr_to_scan)
> goto out;
>
> freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.mmapped,
> sc->nr_to_scan - freed, &remaining,
> - panthor_gem_try_evict_no_resv_wait, NULL);
> + panthor_gem_try_evict_no_resv_wait);
> if (freed >= sc->nr_to_scan)
> goto out;
>
> @@ -1523,7 +1521,7 @@ panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
>
> freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.gpu_mapped_shared,
> sc->nr_to_scan - freed, &remaining,
> - panthor_gem_try_evict, NULL);
> + panthor_gem_try_evict);
>
> out:
> #ifdef CONFIG_DEBUG_FS
> diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c
> index e10dbd18d8cf..ab070bc74857 100644
> --- a/drivers/gpu/drm/panthor/panthor_mmu.c
> +++ b/drivers/gpu/drm/panthor/panthor_mmu.c
> @@ -3133,8 +3133,7 @@ int panthor_vm_prepare_mapped_bos_resvs(struct drm_exec *exec, struct panthor_vm
> unsigned long
> panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
> unsigned int nr_to_scan, unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *,
> - struct ww_acquire_ctx *))
> + bool (*shrink)(struct drm_gem_object *))
> {
> unsigned long freed = 0;
> LIST_HEAD(remaining_vms);
> @@ -3160,7 +3159,7 @@ panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
>
> freed += drm_gem_lru_scan(&ptdev->base, &vm->reclaim.lru,
> nr_to_scan - freed,
> - remaining, shrink, NULL);
> + remaining, shrink);
>
> mutex_lock(&ptdev->base.gem_lru_mutex);
>
> diff --git a/drivers/gpu/drm/panthor/panthor_mmu.h b/drivers/gpu/drm/panthor/panthor_mmu.h
> index 3522fbbce369..abc36e7204be 100644
> --- a/drivers/gpu/drm/panthor/panthor_mmu.h
> +++ b/drivers/gpu/drm/panthor/panthor_mmu.h
> @@ -52,8 +52,7 @@ int panthor_vm_evict_bo_mappings_locked(struct panthor_gem_object *bo);
> unsigned long
> panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
> unsigned int nr_to_scan, unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *,
> - struct ww_acquire_ctx *));
> + bool (*shrink)(struct drm_gem_object *));
> int panthor_vm_prepare_mapped_bos_resvs(struct drm_exec *exec,
> struct panthor_vm *vm,
> u32 slot_count);
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 8a704f6a65c1..ffa607c91aa2 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -616,8 +616,7 @@ drm_gem_lru_scan(struct drm_device *dev,
> struct drm_gem_lru *lru,
> unsigned int nr_to_scan,
> unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
> - struct ww_acquire_ctx *ticket);
> + bool (*shrink)(struct drm_gem_object *obj));
>
> int drm_gem_evict_locked(struct drm_gem_object *obj);
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH] drm/gem: Drop ticket arg to lru_scan()
2026-08-31 17:44 [PATCH] drm/gem: Drop ticket arg to lru_scan() Rob Clark
2026-09-01 7:26 ` Boris Brezillon
@ 2026-09-01 16:31 ` Liviu Dudau
1 sibling, 0 replies; 3+ messages in thread
From: Liviu Dudau @ 2026-09-01 16:31 UTC (permalink / raw)
To: Rob Clark
Cc: dri-devel, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann,
David Airlie, Simona Vetter, Dmitry Baryshkov, Abhinav Kumar,
Jessica Zhang, Sean Paul, Marijn Suijten, Boris Brezillon,
Steven Price, open list,
open list:DRM DRIVER for Qualcomm display hardware,
open list:DRM DRIVER for Qualcomm display hardware
On Mon, Aug 31, 2026 at 10:44:08AM -0700, Rob Clark wrote:
> Commit 3392291fc509 ("drm/msm: Fix shrinker deadlock") dropped the only
> use of the ticket arg, but at the time left drm_gem_lru_scan() unchanged
> to avoid conflicts with in-flight pathor shrinker support. This commit
> is the followup to remove the unused arg.
>
> Signed-off-by: Rob Clark <robin.clark@oss.qualcomm.com>
With the panthor spelling fixed:
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Best regards,
Liviu
> ---
> drivers/gpu/drm/drm_gem.c | 13 +++----------
> drivers/gpu/drm/msm/msm_gem_shrinker.c | 22 ++++++++++------------
> drivers/gpu/drm/panthor/panthor_gem.c | 14 ++++++--------
> drivers/gpu/drm/panthor/panthor_mmu.c | 5 ++---
> drivers/gpu/drm/panthor/panthor_mmu.h | 3 +--
> include/drm/drm_gem.h | 3 +--
> 6 files changed, 23 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
> index e3ed684ddcf2..15acb958ecd5 100644
> --- a/drivers/gpu/drm/drm_gem.c
> +++ b/drivers/gpu/drm/drm_gem.c
> @@ -1656,8 +1656,7 @@ drm_gem_lru_scan(struct drm_device *dev,
> struct drm_gem_lru *lru,
> unsigned int nr_to_scan,
> unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
> - struct ww_acquire_ctx *ticket)
> + bool (*shrink)(struct drm_gem_object *obj))
> {
> struct drm_gem_lru still_in_lru;
> struct drm_gem_object *obj;
> @@ -1690,20 +1689,17 @@ drm_gem_lru_scan(struct drm_device *dev,
> */
> mutex_unlock(&dev->gem_lru_mutex);
>
> - if (ticket)
> - ww_acquire_init(ticket, &reservation_ww_class);
> -
> /*
> * Note that this still needs to be trylock, since we can
> * hit shrinker in response to trying to get backing pages
> * for this obj (ie. while it's lock is already held)
> */
> - if (!ww_mutex_trylock(&obj->resv->lock, ticket)) {
> + if (!ww_mutex_trylock(&obj->resv->lock, NULL)) {
> *remaining += obj->size >> PAGE_SHIFT;
> goto tail;
> }
>
> - if (shrink(obj, ticket)) {
> + if (shrink(obj)) {
> freed += obj->size >> PAGE_SHIFT;
>
> /*
> @@ -1727,9 +1723,6 @@ drm_gem_lru_scan(struct drm_device *dev,
>
> dma_resv_unlock(obj->resv);
>
> - if (ticket)
> - ww_acquire_fini(ticket);
> -
> tail:
> drm_gem_object_put(obj);
> mutex_lock(&dev->gem_lru_mutex);
> diff --git a/drivers/gpu/drm/msm/msm_gem_shrinker.c b/drivers/gpu/drm/msm/msm_gem_shrinker.c
> index 9d2788f79ace..3514d5c84989 100644
> --- a/drivers/gpu/drm/msm/msm_gem_shrinker.c
> +++ b/drivers/gpu/drm/msm/msm_gem_shrinker.c
> @@ -102,7 +102,7 @@ with_vm_locks(void (*fn)(struct drm_gem_object *obj),
> }
>
> static bool
> -purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
> +purge(struct drm_gem_object *obj)
> {
> if (!is_purgeable(to_msm_bo(obj)))
> return false;
> @@ -114,7 +114,7 @@ purge(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
> }
>
> static bool
> -evict(struct drm_gem_object *obj, struct ww_acquire_ctx *unused)
> +evict(struct drm_gem_object *obj)
> {
> if (is_unevictable(to_msm_bo(obj)))
> return false;
> @@ -133,21 +133,21 @@ wait_for_idle(struct drm_gem_object *obj)
> }
>
> static bool
> -active_purge(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
> +active_purge(struct drm_gem_object *obj)
> {
> if (!wait_for_idle(obj))
> return false;
>
> - return purge(obj, ticket);
> + return purge(obj);
> }
>
> static bool
> -active_evict(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
> +active_evict(struct drm_gem_object *obj)
> {
> if (!wait_for_idle(obj))
> return false;
>
> - return evict(obj, ticket);
> + return evict(obj);
> }
>
> static unsigned long
> @@ -156,7 +156,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
> struct msm_drm_private *priv = shrinker->private_data;
> struct {
> struct drm_gem_lru *lru;
> - bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket);
> + bool (*shrink)(struct drm_gem_object *obj);
> bool cond;
> unsigned long freed;
> unsigned long remaining;
> @@ -180,8 +180,7 @@ msm_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
> stages[i].freed =
> drm_gem_lru_scan(priv->dev, stages[i].lru, nr,
> &stages[i].remaining,
> - stages[i].shrink,
> - NULL);
> + stages[i].shrink);
> nr -= stages[i].freed;
> freed += stages[i].freed;
> remaining += stages[i].remaining;
> @@ -222,7 +221,7 @@ msm_gem_shrinker_shrink(struct drm_device *dev, unsigned long nr_to_scan)
> static const int vmap_shrink_limit = 15;
>
> static bool
> -vmap_shrink(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket)
> +vmap_shrink(struct drm_gem_object *obj)
> {
> if (!is_vunmapable(to_msm_bo(obj)))
> return false;
> @@ -250,8 +249,7 @@ msm_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr)
> unmapped += drm_gem_lru_scan(priv->dev, lrus[idx],
> vmap_shrink_limit - unmapped,
> &remaining,
> - vmap_shrink,
> - NULL);
> + vmap_shrink);
> }
>
> *(unsigned long *)ptr += unmapped;
> diff --git a/drivers/gpu/drm/panthor/panthor_gem.c b/drivers/gpu/drm/panthor/panthor_gem.c
> index 54535bae2b0c..17408f832af3 100644
> --- a/drivers/gpu/drm/panthor/panthor_gem.c
> +++ b/drivers/gpu/drm/panthor/panthor_gem.c
> @@ -1392,8 +1392,7 @@ panthor_gem_shrinker_count(struct shrinker *shrinker, struct shrink_control *sc)
> return count ? count : SHRINK_EMPTY;
> }
>
> -static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj,
> - struct ww_acquire_ctx *ticket)
> +static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj)
> {
> /*
> * Track last locked entry for unwinding locks in error and
> @@ -1479,8 +1478,7 @@ static bool panthor_gem_try_evict_no_resv_wait(struct drm_gem_object *obj,
> return ret == 0;
> }
>
> -static bool panthor_gem_try_evict(struct drm_gem_object *obj,
> - struct ww_acquire_ctx *ticket)
> +static bool panthor_gem_try_evict(struct drm_gem_object *obj)
> {
> struct panthor_gem_object *bo = to_panthor_bo(obj);
>
> @@ -1488,7 +1486,7 @@ static bool panthor_gem_try_evict(struct drm_gem_object *obj,
> if (dma_resv_wait_timeout(obj->resv, DMA_RESV_USAGE_BOOKKEEP, false, 10) <= 0)
> return false;
>
> - return panthor_gem_try_evict_no_resv_wait(&bo->base, ticket);
> + return panthor_gem_try_evict_no_resv_wait(&bo->base);
> }
>
> static unsigned long
> @@ -1503,13 +1501,13 @@ panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
>
> freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.unused,
> sc->nr_to_scan - freed, &remaining,
> - panthor_gem_try_evict_no_resv_wait, NULL);
> + panthor_gem_try_evict_no_resv_wait);
> if (freed >= sc->nr_to_scan)
> goto out;
>
> freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.mmapped,
> sc->nr_to_scan - freed, &remaining,
> - panthor_gem_try_evict_no_resv_wait, NULL);
> + panthor_gem_try_evict_no_resv_wait);
> if (freed >= sc->nr_to_scan)
> goto out;
>
> @@ -1523,7 +1521,7 @@ panthor_gem_shrinker_scan(struct shrinker *shrinker, struct shrink_control *sc)
>
> freed += drm_gem_lru_scan(&ptdev->base, &ptdev->reclaim.gpu_mapped_shared,
> sc->nr_to_scan - freed, &remaining,
> - panthor_gem_try_evict, NULL);
> + panthor_gem_try_evict);
>
> out:
> #ifdef CONFIG_DEBUG_FS
> diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c
> index e10dbd18d8cf..ab070bc74857 100644
> --- a/drivers/gpu/drm/panthor/panthor_mmu.c
> +++ b/drivers/gpu/drm/panthor/panthor_mmu.c
> @@ -3133,8 +3133,7 @@ int panthor_vm_prepare_mapped_bos_resvs(struct drm_exec *exec, struct panthor_vm
> unsigned long
> panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
> unsigned int nr_to_scan, unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *,
> - struct ww_acquire_ctx *))
> + bool (*shrink)(struct drm_gem_object *))
> {
> unsigned long freed = 0;
> LIST_HEAD(remaining_vms);
> @@ -3160,7 +3159,7 @@ panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
>
> freed += drm_gem_lru_scan(&ptdev->base, &vm->reclaim.lru,
> nr_to_scan - freed,
> - remaining, shrink, NULL);
> + remaining, shrink);
>
> mutex_lock(&ptdev->base.gem_lru_mutex);
>
> diff --git a/drivers/gpu/drm/panthor/panthor_mmu.h b/drivers/gpu/drm/panthor/panthor_mmu.h
> index 3522fbbce369..abc36e7204be 100644
> --- a/drivers/gpu/drm/panthor/panthor_mmu.h
> +++ b/drivers/gpu/drm/panthor/panthor_mmu.h
> @@ -52,8 +52,7 @@ int panthor_vm_evict_bo_mappings_locked(struct panthor_gem_object *bo);
> unsigned long
> panthor_mmu_reclaim_priv_bos(struct panthor_device *ptdev,
> unsigned int nr_to_scan, unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *,
> - struct ww_acquire_ctx *));
> + bool (*shrink)(struct drm_gem_object *));
> int panthor_vm_prepare_mapped_bos_resvs(struct drm_exec *exec,
> struct panthor_vm *vm,
> u32 slot_count);
> diff --git a/include/drm/drm_gem.h b/include/drm/drm_gem.h
> index 8a704f6a65c1..ffa607c91aa2 100644
> --- a/include/drm/drm_gem.h
> +++ b/include/drm/drm_gem.h
> @@ -616,8 +616,7 @@ drm_gem_lru_scan(struct drm_device *dev,
> struct drm_gem_lru *lru,
> unsigned int nr_to_scan,
> unsigned long *remaining,
> - bool (*shrink)(struct drm_gem_object *obj, struct ww_acquire_ctx *ticket),
> - struct ww_acquire_ctx *ticket);
> + bool (*shrink)(struct drm_gem_object *obj));
>
> int drm_gem_evict_locked(struct drm_gem_object *obj);
>
> --
> 2.55.0
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
¯\_(ツ)_/¯
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2026-09-01 16:32 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2026-08-31 17:44 [PATCH] drm/gem: Drop ticket arg to lru_scan() Rob Clark
2026-09-01 7:26 ` Boris Brezillon
2026-09-01 16:31 ` Liviu Dudau
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