Message-ID: <07c8c715-4016-4963-8544-2e9cc1a8208b@arm.com>
Date: Mon, 23 Sep 2024 10:07:14 +0100
From: Steven Price <steven.price@....com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Liviu Dudau <liviu.dudau@....com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>
Cc: kernel@...labora.com, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
 linaro-mm-sig@...ts.linaro.org,
 Boris Brezillon <boris.brezillon@...labora.com>
Subject: Re: [PATCH v7 1/5] drm/panthor: introduce job cycle and timestamp
 accounting

On 21/09/2024 00:43, Adrián Larumbe wrote:
> Enable calculations of job submission times in clock cycles and wall
> time. This is done by expanding the boilerplate command stream when running
> a job to include instructions that compute said times right before and
> after a user CS.
> 
> A separate kernel BO is created per queue to store those values. Jobs can
> access their sampled data through an index different from that of the
> queue's ringbuffer. The reason for this is saving memory on the profiling
> information kernel BO, since the amount of simultaneous profiled jobs we
> can write into the queue's ringbuffer might be much smaller than for
> regular jobs, as the former take more CSF instructions.
> 
> This commit is done in preparation for enabling DRM fdinfo support in the
> Panthor driver, which depends on the numbers calculated herein.
> 
> A profile mode mask has been added that will in a future commit allow UM to
> toggle performance metric sampling behaviour, which is disabled by default
> to save power. When a ringbuffer CS is constructed, timestamp and cycling
> sampling instructions are added depending on the enabled flags in the
> profiling mask.
> 
> A helper was provided that calculates the number of instructions for a
> given set of enablement mask, and these are passed as the number of credits
> when initialising a DRM scheduler job.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>
> Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>
> Reviewed-by: Liviu Dudau <liviu.dudau@....com>

I think just one bug remaining - see below...

> ---
>  drivers/gpu/drm/panthor/panthor_device.h |  22 ++
>  drivers/gpu/drm/panthor/panthor_sched.c  | 328 +++++++++++++++++++----
>  2 files changed, 301 insertions(+), 49 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_device.h b/drivers/gpu/drm/panthor/panthor_device.h
> index e388c0472ba7..a48e30d0af30 100644
> --- a/drivers/gpu/drm/panthor/panthor_device.h
> +++ b/drivers/gpu/drm/panthor/panthor_device.h
> @@ -66,6 +66,25 @@ struct panthor_irq {
>  	atomic_t suspended;
>  };
>  
> +/**
> + * enum panthor_device_profiling_mode - Profiling state
> + */
> +enum panthor_device_profiling_flags {
> +	/** @PANTHOR_DEVICE_PROFILING_DISABLED: Profiling is disabled. */
> +	PANTHOR_DEVICE_PROFILING_DISABLED = 0,
> +
> +	/** @PANTHOR_DEVICE_PROFILING_CYCLES: Sampling job cycles. */
> +	PANTHOR_DEVICE_PROFILING_CYCLES = BIT(0),
> +
> +	/** @PANTHOR_DEVICE_PROFILING_TIMESTAMP: Sampling job timestamp. */
> +	PANTHOR_DEVICE_PROFILING_TIMESTAMP = BIT(1),
> +
> +	/** @PANTHOR_DEVICE_PROFILING_ALL: Sampling everything. */
> +	PANTHOR_DEVICE_PROFILING_ALL =
> +	PANTHOR_DEVICE_PROFILING_CYCLES |
> +	PANTHOR_DEVICE_PROFILING_TIMESTAMP,
> +};
> +
>  /**
>   * struct panthor_device - Panthor device
>   */
> @@ -162,6 +181,9 @@ struct panthor_device {
>  		 */
>  		struct page *dummy_latest_flush;
>  	} pm;
> +
> +	/** @profile_mask: User-set profiling flags for job accounting. */
> +	u32 profile_mask;
>  };
>  
>  /**
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 42afdf0ddb7e..6da5c3d0015e 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -93,6 +93,9 @@
>  #define MIN_CSGS				3
>  #define MAX_CSG_PRIO				0xf
>  
> +#define NUM_INSTRS_PER_CACHE_LINE		(64 / sizeof(u64))
> +#define MAX_INSTRS_PER_JOB			24
> +
>  struct panthor_group;
>  
>  /**
> @@ -476,6 +479,18 @@ struct panthor_queue {
>  		 */
>  		struct list_head in_flight_jobs;
>  	} fence_ctx;
> +
> +	/** @profiling: Job profiling data slots and access information. */
> +	struct {
> +		/** @slots: Kernel BO holding the slots. */
> +		struct panthor_kernel_bo *slots;
> +
> +		/** @slot_count: Number of jobs ringbuffer can hold at once. */
> +		u32 slot_count;
> +
> +		/** @seqno: Index of the next available profiling information slot. */
> +		u32 seqno;
> +	} profiling;
>  };
>  
>  /**
> @@ -661,6 +676,18 @@ struct panthor_group {
>  	struct list_head wait_node;
>  };
>  
> +struct panthor_job_profiling_data {
> +	struct {
> +		u64 before;
> +		u64 after;
> +	} cycles;
> +
> +	struct {
> +		u64 before;
> +		u64 after;
> +	} time;
> +};
> +
>  /**
>   * group_queue_work() - Queue a group work
>   * @group: Group to queue the work for.
> @@ -774,6 +801,15 @@ struct panthor_job {
>  
>  	/** @done_fence: Fence signaled when the job is finished or cancelled. */
>  	struct dma_fence *done_fence;
> +
> +	/** @profiling: Job profiling information. */
> +	struct {
> +		/** @mask: Current device job profiling enablement bitmask. */
> +		u32 mask;
> +
> +		/** @slot: Job index in the profiling slots BO. */
> +		u32 slot;
> +	} profiling;
>  };
>  
>  static void
> @@ -838,6 +874,7 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue *
>  
>  	panthor_kernel_bo_destroy(queue->ringbuf);
>  	panthor_kernel_bo_destroy(queue->iface.mem);
> +	panthor_kernel_bo_destroy(queue->profiling.slots);
>  
>  	/* Release the last_fence we were holding, if any. */
>  	dma_fence_put(queue->fence_ctx.last_fence);
> @@ -1982,8 +2019,6 @@ tick_ctx_init(struct panthor_scheduler *sched,
>  	}
>  }
>  
> -#define NUM_INSTRS_PER_SLOT		16
> -
>  static void
>  group_term_post_processing(struct panthor_group *group)
>  {
> @@ -2815,65 +2850,192 @@ static void group_sync_upd_work(struct work_struct *work)
>  	group_put(group);
>  }
>  
> -static struct dma_fence *
> -queue_run_job(struct drm_sched_job *sched_job)
> +struct panthor_job_ringbuf_instrs {
> +	u64 buffer[MAX_INSTRS_PER_JOB];
> +	u32 count;
> +};
> +
> +struct panthor_job_instr {
> +	u32 profile_mask;
> +	u64 instr;
> +};
> +
> +#define JOB_INSTR(__prof, __instr) \
> +	{ \
> +		.profile_mask = __prof, \
> +		.instr = __instr, \
> +	}
> +
> +static void
> +copy_instrs_to_ringbuf(struct panthor_queue *queue,
> +		       struct panthor_job *job,
> +		       struct panthor_job_ringbuf_instrs *instrs)
> +{
> +	u64 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> +	u64 start = job->ringbuf.start & (ringbuf_size - 1);
> +	u64 size, written;
> +
> +	/*
> +	 * We need to write a whole slot, including any trailing zeroes
> +	 * that may come at the end of it. Also, because instrs.buffer has
> +	 * been zero-initialised, there's no need to pad it with 0's
> +	 */
> +	instrs->count = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> +	size = instrs->count * sizeof(u64);
> +	WARN_ON(size > ringbuf_size);
> +	written = min(ringbuf_size - start, size);
> +
> +	memcpy(queue->ringbuf->kmap + start, instrs->buffer, written);
> +
> +	if (written < size)
> +		memcpy(queue->ringbuf->kmap,
> +		       &instrs->buffer[written/sizeof(u64)],
> +		       size - written);
> +}
> +
> +struct panthor_job_cs_params {
> +	u32 profile_mask;
> +	u64 addr_reg; u64 val_reg;
> +	u64 cycle_reg; u64 time_reg;
> +	u64 sync_addr; u64 times_addr;
> +	u64 cs_start; u64 cs_size;
> +	u32 last_flush; u32 waitall_mask;
> +};
> +
> +static void
> +get_job_cs_params(struct panthor_job *job, struct panthor_job_cs_params *params)
>  {
> -	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
>  	struct panthor_group *group = job->group;
>  	struct panthor_queue *queue = group->queues[job->queue_idx];
>  	struct panthor_device *ptdev = group->ptdev;
>  	struct panthor_scheduler *sched = ptdev->scheduler;
> -	u32 ringbuf_size = panthor_kernel_bo_size(queue->ringbuf);
> -	u32 ringbuf_insert = queue->iface.input->insert & (ringbuf_size - 1);
> -	u64 addr_reg = ptdev->csif_info.cs_reg_count -
> -		       ptdev->csif_info.unpreserved_cs_reg_count;
> -	u64 val_reg = addr_reg + 2;
> -	u64 sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> -			job->queue_idx * sizeof(struct panthor_syncobj_64b);
> -	u32 waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
> -	struct dma_fence *done_fence;
> -	int ret;
>  
> -	u64 call_instrs[NUM_INSTRS_PER_SLOT] = {
> -		/* MOV32 rX+2, cs.latest_flush */
> -		(2ull << 56) | (val_reg << 48) | job->call_info.latest_flush,
> +	params->addr_reg = ptdev->csif_info.cs_reg_count -
> +			   ptdev->csif_info.unpreserved_cs_reg_count;
> +	params->val_reg = params->addr_reg + 2;
> +	params->cycle_reg = params->addr_reg;
> +	params->time_reg = params->val_reg;
>  
> -		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
> -		(36ull << 56) | (0ull << 48) | (val_reg << 40) | (0 << 16) | 0x233,
> +	params->sync_addr = panthor_kernel_bo_gpuva(group->syncobjs) +
> +			    job->queue_idx * sizeof(struct panthor_syncobj_64b);
> +	params->times_addr = panthor_kernel_bo_gpuva(queue->profiling.slots) +
> +			     (job->profiling.slot * sizeof(struct panthor_job_profiling_data));
> +	params->waitall_mask = GENMASK(sched->sb_slot_count - 1, 0);
>  
> -		/* MOV48 rX:rX+1, cs.start */
> -		(1ull << 56) | (addr_reg << 48) | job->call_info.start,
> +	params->cs_start = job->call_info.start;
> +	params->cs_size = job->call_info.size;
> +	params->last_flush = job->call_info.latest_flush;
>  
> -		/* MOV32 rX+2, cs.size */
> -		(2ull << 56) | (val_reg << 48) | job->call_info.size,
> +	params->profile_mask = job->profiling.mask;
> +}
>  
> -		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
> -		(3ull << 56) | (1 << 16),
> +#define JOB_INSTR_ALWAYS(instr) \
> +	JOB_INSTR(PANTHOR_DEVICE_PROFILING_DISABLED, (instr))
> +#define JOB_INSTR_TIMESTAMP(instr) \
> +	JOB_INSTR(PANTHOR_DEVICE_PROFILING_TIMESTAMP, (instr))
> +#define JOB_INSTR_CYCLES(instr) \
> +	JOB_INSTR(PANTHOR_DEVICE_PROFILING_CYCLES, (instr))
>  
> +static void
> +prepare_job_instrs(const struct panthor_job_cs_params *params,
> +		   struct panthor_job_ringbuf_instrs *instrs)
> +{
> +	const struct panthor_job_instr instr_seq[] = {
> +		/* MOV32 rX+2, cs.latest_flush */
> +		JOB_INSTR_ALWAYS((2ull << 56) | (params->val_reg << 48) | params->last_flush),
> +		/* FLUSH_CACHE2.clean_inv_all.no_wait.signal(0) rX+2 */
> +		JOB_INSTR_ALWAYS((36ull << 56) | (0ull << 48) | (params->val_reg << 40) | (0 << 16) | 0x233),
> +		/* MOV48 rX:rX+1, cycles_offset */
> +		JOB_INSTR_CYCLES((1ull << 56) | (params->cycle_reg << 48) |
> +				 (params->times_addr + offsetof(struct panthor_job_profiling_data, cycles.before))),
> +		/* STORE_STATE cycles */
> +		JOB_INSTR_CYCLES((40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> +		/* MOV48 rX:rX+1, time_offset */
> +		JOB_INSTR_TIMESTAMP((1ull << 56) | (params->time_reg << 48) | (params->times_addr +
> +			   offsetof(struct panthor_job_profiling_data, time.before))),
> +		/* STORE_STATE timer */
> +		JOB_INSTR_TIMESTAMP((40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
> +		/* MOV48 rX:rX+1, cs.start */
> +		JOB_INSTR_ALWAYS((1ull << 56) | (params->addr_reg << 48) | params->cs_start),
> +		/* MOV32 rX+2, cs.size */
> +		JOB_INSTR_ALWAYS((2ull << 56) | (params->val_reg << 48) | params->cs_size),
> +		/* WAIT(0) => waits for FLUSH_CACHE2 instruction */
> +		JOB_INSTR_ALWAYS((3ull << 56) | (1 << 16)),
>  		/* CALL rX:rX+1, rX+2 */
> -		(32ull << 56) | (addr_reg << 40) | (val_reg << 32),
> -
> +		JOB_INSTR_ALWAYS((32ull << 56) | (params->addr_reg << 40) | (params->val_reg << 32)),
> +		/* MOV48 rX:rX+1, cycles_offset */
> +		JOB_INSTR_CYCLES((1ull << 56) | (params->cycle_reg << 48) |
> +				 (params->times_addr + offsetof(struct panthor_job_profiling_data, cycles.after))),
> +		/* STORE_STATE cycles */
> +		JOB_INSTR_CYCLES((40ull << 56) | (params->cycle_reg << 40) | (1ll << 32)),
> +		/* MOV48 rX:rX+1, time_offset */
> +		JOB_INSTR_TIMESTAMP((1ull << 56) | (params->time_reg << 48) |
> +			  (params->times_addr + offsetof(struct panthor_job_profiling_data, time.after))),
> +		/* STORE_STATE timer */
> +		JOB_INSTR_TIMESTAMP((40ull << 56) | (params->time_reg << 40) | (0ll << 32)),
>  		/* MOV48 rX:rX+1, sync_addr */
> -		(1ull << 56) | (addr_reg << 48) | sync_addr,
> -
> +		JOB_INSTR_ALWAYS((1ull << 56) | (params->addr_reg << 48) | params->sync_addr),
>  		/* MOV48 rX+2, #1 */
> -		(1ull << 56) | (val_reg << 48) | 1,
> -
> +		JOB_INSTR_ALWAYS((1ull << 56) | (params->val_reg << 48) | 1),
>  		/* WAIT(all) */
> -		(3ull << 56) | (waitall_mask << 16),
> -
> +		JOB_INSTR_ALWAYS((3ull << 56) | (params->waitall_mask << 16)),
>  		/* SYNC_ADD64.system_scope.propage_err.nowait rX:rX+1, rX+2*/
> -		(51ull << 56) | (0ull << 48) | (addr_reg << 40) | (val_reg << 32) | (0 << 16) | 1,
> +		JOB_INSTR_ALWAYS((51ull << 56) | (0ull << 48) | (params->addr_reg << 40) |
> +				 (params->val_reg << 32) | (0 << 16) | 1),
> +		/* ERROR_BARRIER, so we can recover from faults at job boundaries. */
> +		JOB_INSTR_ALWAYS((47ull << 56)),
> +	};
> +	u32 pad;
>  
> -		/* ERROR_BARRIER, so we can recover from faults at job
> -		 * boundaries.
> -		 */
> -		(47ull << 56),
> +	/* NEED to be cacheline aligned to please the prefetcher. */
> +	static_assert(sizeof(instrs->buffer) % 64 == 0,
> +		      "panthor_job_ringbuf_instrs::buffer is not aligned on a cacheline");
> +
> +	/* Make sure we have enough storage to store the whole sequence. */
> +	static_assert(ALIGN(ARRAY_SIZE(instr_seq), NUM_INSTRS_PER_CACHE_LINE) ==
> +		      ARRAY_SIZE(instrs->buffer),
> +		      "instr_seq vs panthor_job_ringbuf_instrs::buffer size mismatch");
> +
> +	for (u32 i = 0; i < ARRAY_SIZE(instr_seq); i++) {
> +		/* If the profile mask of this instruction is not enabled, skip it. */
> +		if (instr_seq[i].profile_mask &&
> +		    !(instr_seq[i].profile_mask & params->profile_mask))
> +			continue;
> +
> +		instrs->buffer[instrs->count++] = instr_seq[i].instr;
> +	}
> +
> +	pad = ALIGN(instrs->count, NUM_INSTRS_PER_CACHE_LINE);
> +	memset(&instrs->buffer[instrs->count], 0,
> +	       (pad - instrs->count) * sizeof(instrs->buffer[0]));
> +	instrs->count = pad;
> +}
> +
> +static u32 calc_job_credits(u32 profile_mask)
> +{
> +	struct panthor_job_ringbuf_instrs instrs = {
> +		.count = 0,
> +	};
> +	struct panthor_job_cs_params params = {
> +		.profile_mask = profile_mask,
>  	};
>  
> -	/* Need to be cacheline aligned to please the prefetcher. */
> -	static_assert(sizeof(call_instrs) % 64 == 0,
> -		      "call_instrs is not aligned on a cacheline");
> +	prepare_job_instrs(&params, &instrs);
> +	return instrs.count;
> +}
> +
> +static struct dma_fence *
> +queue_run_job(struct drm_sched_job *sched_job)
> +{
> +	struct panthor_job *job = container_of(sched_job, struct panthor_job, base);
> +	struct panthor_group *group = job->group;
> +	struct panthor_queue *queue = group->queues[job->queue_idx];
> +	struct panthor_device *ptdev = group->ptdev;
> +	struct panthor_scheduler *sched = ptdev->scheduler;
> +	struct panthor_job_ringbuf_instrs instrs;

instrs isn't initialised...

> +	struct panthor_job_cs_params cs_params;
> +	struct dma_fence *done_fence;
> +	int ret;
>  
>  	/* Stream size is zero, nothing to do except making sure all previously
>  	 * submitted jobs are done before we signal the
> @@ -2900,17 +3062,23 @@ queue_run_job(struct drm_sched_job *sched_job)
>  		       queue->fence_ctx.id,
>  		       atomic64_inc_return(&queue->fence_ctx.seqno));
>  
> -	memcpy(queue->ringbuf->kmap + ringbuf_insert,
> -	       call_instrs, sizeof(call_instrs));
> +	job->profiling.slot = queue->profiling.seqno++;
> +	if (queue->profiling.seqno == queue->profiling.slot_count)
> +		queue->profiling.seqno = 0;
> +
> +	job->ringbuf.start = queue->iface.input->insert;
> +
> +	get_job_cs_params(job, &cs_params);
> +	prepare_job_instrs(&cs_params, &instrs);

...but it's passed into prepare_job_instrs() which depends on
instrs.count (same bug as was in calc_job_credits()) - sorry I didn't
spot it last review.

Initializing instrs makes everything work for me.

I'm not sure quite what kernel configuration you are using but I wonder
if you've got a 'hardening' option enabled which is causing the stack to
be zero-initialised. It's worth turning it off for testing purposes ;)

Steve

> +	copy_instrs_to_ringbuf(queue, job, &instrs);
> +
> +	job->ringbuf.end = job->ringbuf.start + (instrs.count * sizeof(u64));
>  
>  	panthor_job_get(&job->base);
>  	spin_lock(&queue->fence_ctx.lock);
>  	list_add_tail(&job->node, &queue->fence_ctx.in_flight_jobs);
>  	spin_unlock(&queue->fence_ctx.lock);
>  
> -	job->ringbuf.start = queue->iface.input->insert;
> -	job->ringbuf.end = job->ringbuf.start + sizeof(call_instrs);
> -
>  	/* Make sure the ring buffer is updated before the INSERT
>  	 * register.
>  	 */
> @@ -3003,6 +3171,34 @@ static const struct drm_sched_backend_ops panthor_queue_sched_ops = {
>  	.free_job = queue_free_job,
>  };
>  
> +static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
> +				       u32 cs_ringbuf_size)
> +{
> +	u32 min_profiled_job_instrs = U32_MAX;
> +	u32 last_flag = fls(PANTHOR_DEVICE_PROFILING_ALL);
> +
> +	/*
> +	 * We want to calculate the minimum size of a profiled job's CS,
> +	 * because since they need additional instructions for the sampling
> +	 * of performance metrics, they might take up further slots in
> +	 * the queue's ringbuffer. This means we might not need as many job
> +	 * slots for keeping track of their profiling information. What we
> +	 * need is the maximum number of slots we should allocate to this end,
> +	 * which matches the maximum number of profiled jobs we can place
> +	 * simultaneously in the queue's ring buffer.
> +	 * That has to be calculated separately for every single job profiling
> +	 * flag, but not in the case job profiling is disabled, since unprofiled
> +	 * jobs don't need to keep track of this at all.
> +	 */
> +	for (u32 i = 0; i < last_flag; i++) {
> +		if (BIT(i) & PANTHOR_DEVICE_PROFILING_ALL)
> +			min_profiled_job_instrs =
> +				min(min_profiled_job_instrs, calc_job_credits(BIT(i)));
> +	}
> +
> +	return DIV_ROUND_UP(cs_ringbuf_size, min_profiled_job_instrs * sizeof(u64));
> +}
> +
>  static struct panthor_queue *
>  group_create_queue(struct panthor_group *group,
>  		   const struct drm_panthor_queue_create *args)
> @@ -3056,9 +3252,35 @@ group_create_queue(struct panthor_group *group,
>  		goto err_free_queue;
>  	}
>  
> +	queue->profiling.slot_count =
> +		calc_profiling_ringbuf_num_slots(group->ptdev, args->ringbuf_size);
> +
> +	queue->profiling.slots =
> +		panthor_kernel_bo_create(group->ptdev, group->vm,
> +					 queue->profiling.slot_count *
> +					 sizeof(struct panthor_job_profiling_data),
> +					 DRM_PANTHOR_BO_NO_MMAP,
> +					 DRM_PANTHOR_VM_BIND_OP_MAP_NOEXEC |
> +					 DRM_PANTHOR_VM_BIND_OP_MAP_UNCACHED,
> +					 PANTHOR_VM_KERNEL_AUTO_VA);
> +
> +	if (IS_ERR(queue->profiling.slots)) {
> +		ret = PTR_ERR(queue->profiling.slots);
> +		goto err_free_queue;
> +	}
> +
> +	ret = panthor_kernel_bo_vmap(queue->profiling.slots);
> +	if (ret)
> +		goto err_free_queue;
> +
> +	/*
> +	 * Credit limit argument tells us the total number of instructions
> +	 * across all CS slots in the ringbuffer, with some jobs requiring
> +	 * twice as many as others, depending on their profiling status.
> +	 */
>  	ret = drm_sched_init(&queue->scheduler, &panthor_queue_sched_ops,
>  			     group->ptdev->scheduler->wq, 1,
> -			     args->ringbuf_size / (NUM_INSTRS_PER_SLOT * sizeof(u64)),
> +			     args->ringbuf_size / sizeof(u64),
>  			     0, msecs_to_jiffies(JOB_TIMEOUT_MS),
>  			     group->ptdev->reset.wq,
>  			     NULL, "panthor-queue", group->ptdev->base.dev);
> @@ -3354,6 +3576,7 @@ panthor_job_create(struct panthor_file *pfile,
>  {
>  	struct panthor_group_pool *gpool = pfile->groups;
>  	struct panthor_job *job;
> +	u32 credits;
>  	int ret;
>  
>  	if (qsubmit->pad)
> @@ -3407,9 +3630,16 @@ panthor_job_create(struct panthor_file *pfile,
>  		}
>  	}
>  
> +	job->profiling.mask = pfile->ptdev->profile_mask;
> +	credits = calc_job_credits(job->profiling.mask);
> +	if (credits == 0) {
> +		ret = -EINVAL;
> +		goto err_put_job;
> +	}
> +
>  	ret = drm_sched_job_init(&job->base,
>  				 &job->group->queues[job->queue_idx]->entity,
> -				 1, job->group);
> +				 credits, job->group);
>  	if (ret)
>  		goto err_put_job;
>  

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