Re: [PATCH 6.13.y] drm/panthor: Replace sleep locks with spinlocks in fdinfo path

[Sasha Levin <sashal@kernel.org>]

[ Sasha's backport helper bot ]

Hi,

Summary of potential issues:
⚠️ Found matching upstream commit but patch is missing proper reference to it

Found matching upstream commit: e379856b428acafb8ed689f31d65814da6447b2e

Status in newer kernel trees:
6.14.y | Present (different SHA1: 446311aa801c)

Note: The patch differs from the upstream commit:
---
1:  e379856b428ac ! 1:  f19951b3eb02d drm/panthor: Replace sleep locks with spinlocks in fdinfo path
    @@ Commit message
         Reviewed-by: Steven Price <steven.price@arm.com>
         Signed-off-by: Steven Price <steven.price@arm.com>
         Link: https://patchwork.freedesktop.org/patch/msgid/20250303190923.1639985-1-adrian.larumbe@collabora.com
    +    (cherry picked from commit e379856b428acafb8ed689f31d65814da6447b2e)
     
      ## drivers/gpu/drm/panthor/panthor_sched.c ##
     @@
    @@ drivers/gpu/drm/panthor/panthor_sched.c
      #include <linux/delay.h>
      #include <linux/dma-mapping.h>
     @@ drivers/gpu/drm/panthor/panthor_sched.c: struct panthor_group {
    + 
    + 	/** @fdinfo: Per-file total cycle and timestamp values reference. */
    + 	struct {
    +-		/** @data: Total sampled values for jobs in queues from this group. */
    ++		/** @fdinfo.data: Total sampled values for jobs in queues from this group. */
      		struct panthor_gpu_usage data;
      
      		/**
    @@ drivers/gpu/drm/panthor/panthor_sched.c: struct panthor_group {
      		 */
     -		struct mutex lock;
     +		spinlock_t lock;
    + 	} fdinfo;
      
    - 		/** @fdinfo.kbo_sizes: Aggregate size of private kernel BO's held by the group. */
    - 		size_t kbo_sizes;
    + 	/** @state: Group state. */
     @@ drivers/gpu/drm/panthor/panthor_sched.c: static void group_release_work(struct work_struct *work)
      						   release_work);
      	u32 i;
    @@ drivers/gpu/drm/panthor/panthor_sched.c: void panthor_fdinfo_gather_group_sample
      	xa_unlock(&gpool->xa);
      }
     @@ drivers/gpu/drm/panthor/panthor_sched.c: int panthor_group_create(struct panthor_file *pfile,
    + 	}
      	mutex_unlock(&sched->reset.lock);
      
    - 	add_group_kbo_sizes(group->ptdev, group);
     -	mutex_init(&group->fdinfo.lock);
     +	spin_lock_init(&group->fdinfo.lock);
      
---

Results of testing on various branches:

| Branch                    | Patch Apply | Build Test |
|---------------------------|-------------|------------|
| stable/linux-6.13.y       |  Success    |  Success   |