linux-kernel - Re: [PATCH v3 3/5] media: iris: use np_dev as preferred DMA device in HFI queue management

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Message-ID: <ebdbb517-ffa2-422a-989e-a4f19ab0163a@linaro.org>
Date: Fri, 27 Jun 2025 18:03:56 +0100
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/5] media: iris: use np_dev as preferred DMA device in
 HFI queue management

On 27/06/2025 16:48, Vikash Garodia wrote:
> Update HFI interface queues to use np_dev(preferred non-pixel device)
> for DMA memory allocation and deallocation if available. This allows
> platforms with separate DMA domain for non-pixel to use the appropriate
> device handle when managing HFI queues and SFR regions.
> 
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
>   drivers/media/platform/qcom/iris/iris_hfi_queue.c | 20 +++++++++++++-------
>   1 file changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_queue.c b/drivers/media/platform/qcom/iris/iris_hfi_queue.c
> index fac7df0c4d1aec647aeca275ab19651c9ba23733..a31ebe947f525f0d7c09f8b786939d01b62532c3 100644
> --- a/drivers/media/platform/qcom/iris/iris_hfi_queue.c
> +++ b/drivers/media/platform/qcom/iris/iris_hfi_queue.c
> @@ -247,24 +247,27 @@ static void iris_hfi_queue_deinit(struct iris_iface_q_info *iface_q)
>   int iris_hfi_queues_init(struct iris_core *core)
>   {
>   	struct iris_hfi_queue_table_header *q_tbl_hdr;
> +	struct device *dev;
>   	u32 queue_size;
>   
> +	dev = core->np_dev ? core->np_dev : core->dev;
> +

dev = core->dev;
if (core->np_dev)
     dev = core->np_dev;

Is much easier to read.

>   	/* Iris hardware requires 4K queue alignment */
>   	queue_size = ALIGN((sizeof(*q_tbl_hdr) + (IFACEQ_QUEUE_SIZE * IFACEQ_NUMQ)), SZ_4K);
> -	core->iface_q_table_vaddr = dma_alloc_attrs(core->dev, queue_size,
> +	core->iface_q_table_vaddr = dma_alloc_attrs(dev, queue_size,
>   						    &core->iface_q_table_daddr,
>   						    GFP_KERNEL, DMA_ATTR_WRITE_COMBINE);
>   	if (!core->iface_q_table_vaddr) {
> -		dev_err(core->dev, "queues alloc and map failed\n");
> +		dev_err(dev, "queues alloc and map failed\n");
>   		return -ENOMEM;
>   	}
>   
> -	core->sfr_vaddr = dma_alloc_attrs(core->dev, SFR_SIZE,
> +	core->sfr_vaddr = dma_alloc_attrs(dev, SFR_SIZE,
>   					  &core->sfr_daddr,
>   					  GFP_KERNEL, DMA_ATTR_WRITE_COMBINE);
>   	if (!core->sfr_vaddr) {
> -		dev_err(core->dev, "sfr alloc and map failed\n");
> -		dma_free_attrs(core->dev, sizeof(*q_tbl_hdr), core->iface_q_table_vaddr,
> +		dev_err(dev, "sfr alloc and map failed\n");
> +		dma_free_attrs(dev, sizeof(*q_tbl_hdr), core->iface_q_table_vaddr,
>   			       core->iface_q_table_daddr, DMA_ATTR_WRITE_COMBINE);
>   		return -ENOMEM;
>   	}
> @@ -292,6 +295,7 @@ int iris_hfi_queues_init(struct iris_core *core)
>   
>   void iris_hfi_queues_deinit(struct iris_core *core)
>   {
> +	struct device *dev;
>   	u32 queue_size;
>   
>   	if (!core->iface_q_table_vaddr)
> @@ -301,7 +305,9 @@ void iris_hfi_queues_deinit(struct iris_core *core)
>   	iris_hfi_queue_deinit(&core->message_queue);
>   	iris_hfi_queue_deinit(&core->command_queue);
>   
> -	dma_free_attrs(core->dev, SFR_SIZE, core->sfr_vaddr,
> +	dev = core->np_dev ? core->np_dev : core->dev;

and again

> +
> +	dma_free_attrs(dev, SFR_SIZE, core->sfr_vaddr,
>   		       core->sfr_daddr, DMA_ATTR_WRITE_COMBINE);
>   
>   	core->sfr_vaddr = NULL;
> @@ -310,7 +316,7 @@ void iris_hfi_queues_deinit(struct iris_core *core)
>   	queue_size = ALIGN(sizeof(struct iris_hfi_queue_table_header) +
>   		(IFACEQ_QUEUE_SIZE * IFACEQ_NUMQ), SZ_4K);
>   
> -	dma_free_attrs(core->dev, queue_size, core->iface_q_table_vaddr,
> +	dma_free_attrs(dev, queue_size, core->iface_q_table_vaddr,
>   		       core->iface_q_table_daddr, DMA_ATTR_WRITE_COMBINE);
>   
>   	core->iface_q_table_vaddr = NULL;
> 
Other than that.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>