linux-kernel - Re: [PATCH V4 XDMA 2/2] dmaengine: xilinx: xdma: Add user logic interrupt support

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Date:   Tue, 27 Sep 2022 18:46:09 +0200
From:   Martin Tůma <tumic@...see.org>
To:     Lizhi Hou <lizhi.hou@....com>, vkoul@...nel.org,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        trix@...hat.com
Cc:     max.zhen@....com, sonal.santan@....com, larry.liu@....com,
        brian.xu@....com
Subject: Re: [PATCH V4 XDMA 2/2] dmaengine: xilinx: xdma: Add user logic
 interrupt support

On 27. 09. 22 18:28, Lizhi Hou wrote:

> Okay, I got the point. How about changing request/remove APIs to 
> enable/disable APIs as below
> 
>       xdma_enable_user_irq(struct platform_device *pdev, u32 
> user_irq_index, u32 *irq)
> 
>              user_irq_index: user logic interrupt wire index. (XDMA 
> driver determines how system IRQs are mapped to DMA channels and user 
> logic wires)
> 
>              irq: IRQ number returned for registering interrupt handler 
> (request_irq()) or passing to existing platform driver.
> 
>      xdma_disable_user_irq(struct platform_device *pdev, u32 
> user_irq_index)
> 
> Does this make sense to you?
> 

I think even the "irq" parameter in the enable function is surplus as 
the parent driver (the driver of the actual PCIe card) knows* what PCI 
irq he has to allocate without XDMA providing the number.

xdma_enable_user_irq(struct platform_device *pdev, u32 user_irq_index);
xdma_disable_user_irq(struct platform_device *pdev, u32 user_irq_index);

should be all that is needed.

M.

* something like:
pci_irq_vector((pdev), PCI_BAR_ID) + NUM_C2H_CHANNELS + NUM_H2C_CHANNELS
can be used from the PCIe driver