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Date: Fri, 2 Feb 2024 13:50:47 +0300
From: Serge Semin <fancer.lancer@gmail.com>
To: Mrinmay Sarkar <quic_msarkar@quicinc.com>
Cc: vkoul@kernel.org, jingoohan1@gmail.com, conor+dt@kernel.org, 
	konrad.dybcio@linaro.org, manivannan.sadhasivam@linaro.org, robh+dt@kernel.org, 
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	Lorenzo Pieralisi <lpieralisi@kernel.org>, Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>, 
	Rob Herring <robh@kernel.org>, Bjorn Helgaas <bhelgaas@google.com>, 
	Kishon Vijay Abraham I <kishon@kernel.org>, dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org, 
	linux-pci@vger.kernel.org, linux-arm-msm@vger.kernel.org, mhi@lists.linux.dev
Subject: Re: [PATCH v1 1/6] dmaengine: dw-edma: Pass 'struct dw_edma_chip' to
 irq_vector()
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 <1705669223-5655-2-git-send-email-quic_msarkar@quicinc.com>
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In-Reply-To: <1705669223-5655-2-git-send-email-quic_msarkar@quicinc.com>

On Fri, Jan 19, 2024 at 06:30:17PM +0530, Mrinmay Sarkar wrote:
> From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> 
> eDMA client drivers defining the irq_vector() callback need to access the
> members of dw_edma_chip structure. So let's pass that pointer instead.

See my comment to the patch 4:
https://lore.kernel.org/linux-pci/qfdsnz7louqdrs6mhz72o6mzjo66kw63vtlhgpz6hgqfyyzyhq@tge3r7mvwtw3/

-Serge(y)

> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
> Signed-off-by: Mrinmay Sarkar <quic_msarkar@quicinc.com>
> ---
>  drivers/dma/dw-edma/dw-edma-core.c           | 11 +++++------
>  drivers/dma/dw-edma/dw-edma-pcie.c           |  4 ++--
>  drivers/pci/controller/dwc/pcie-designware.c |  4 ++--
>  include/linux/dma/edma.h                     |  3 ++-
>  4 files changed, 11 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> index 6823624..7fe1c19 100644
> --- a/drivers/dma/dw-edma/dw-edma-core.c
> +++ b/drivers/dma/dw-edma/dw-edma-core.c
> @@ -849,7 +849,7 @@ static int dw_edma_irq_request(struct dw_edma *dw,
>  
>  	if (chip->nr_irqs == 1) {
>  		/* Common IRQ shared among all channels */
> -		irq = chip->ops->irq_vector(dev, 0);
> +		irq = chip->ops->irq_vector(chip, 0);
>  		err = request_irq(irq, dw_edma_interrupt_common,
>  				  IRQF_SHARED, dw->name, &dw->irq[0]);
>  		if (err) {
> @@ -874,7 +874,7 @@ static int dw_edma_irq_request(struct dw_edma *dw,
>  		dw_edma_add_irq_mask(&rd_mask, *rd_alloc, dw->rd_ch_cnt);
>  
>  		for (i = 0; i < (*wr_alloc + *rd_alloc); i++) {
> -			irq = chip->ops->irq_vector(dev, i);
> +			irq = chip->ops->irq_vector(chip, i);
>  			err = request_irq(irq,
>  					  i < *wr_alloc ?
>  						dw_edma_interrupt_write :
> @@ -895,7 +895,7 @@ static int dw_edma_irq_request(struct dw_edma *dw,
>  
>  err_irq_free:
>  	for  (i--; i >= 0; i--) {
> -		irq = chip->ops->irq_vector(dev, i);
> +		irq = chip->ops->irq_vector(chip, i);
>  		free_irq(irq, &dw->irq[i]);
>  	}
>  
> @@ -975,7 +975,7 @@ int dw_edma_probe(struct dw_edma_chip *chip)
>  
>  err_irq_free:
>  	for (i = (dw->nr_irqs - 1); i >= 0; i--)
> -		free_irq(chip->ops->irq_vector(dev, i), &dw->irq[i]);
> +		free_irq(chip->ops->irq_vector(chip, i), &dw->irq[i]);
>  
>  	return err;
>  }
> @@ -984,7 +984,6 @@ EXPORT_SYMBOL_GPL(dw_edma_probe);
>  int dw_edma_remove(struct dw_edma_chip *chip)
>  {
>  	struct dw_edma_chan *chan, *_chan;
> -	struct device *dev = chip->dev;
>  	struct dw_edma *dw = chip->dw;
>  	int i;
>  
> @@ -997,7 +996,7 @@ int dw_edma_remove(struct dw_edma_chip *chip)
>  
>  	/* Free irqs */
>  	for (i = (dw->nr_irqs - 1); i >= 0; i--)
> -		free_irq(chip->ops->irq_vector(dev, i), &dw->irq[i]);
> +		free_irq(chip->ops->irq_vector(chip, i), &dw->irq[i]);
>  
>  	/* Deregister eDMA device */
>  	dma_async_device_unregister(&dw->dma);
> diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
> index 1c60437..2b13725 100644
> --- a/drivers/dma/dw-edma/dw-edma-pcie.c
> +++ b/drivers/dma/dw-edma/dw-edma-pcie.c
> @@ -90,9 +90,9 @@ static const struct dw_edma_pcie_data snps_edda_data = {
>  	.rd_ch_cnt			= 2,
>  };
>  
> -static int dw_edma_pcie_irq_vector(struct device *dev, unsigned int nr)
> +static int dw_edma_pcie_irq_vector(struct dw_edma_chip *chip, unsigned int nr)
>  {
> -	return pci_irq_vector(to_pci_dev(dev), nr);
> +	return pci_irq_vector(to_pci_dev(chip->dev), nr);
>  }
>  
>  static u64 dw_edma_pcie_address(struct device *dev, phys_addr_t cpu_addr)
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 250cf7f..eca047a 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -858,9 +858,9 @@ static u32 dw_pcie_readl_dma(struct dw_pcie *pci, u32 reg)
>  	return val;
>  }
>  
> -static int dw_pcie_edma_irq_vector(struct device *dev, unsigned int nr)
> +static int dw_pcie_edma_irq_vector(struct dw_edma_chip *edma, unsigned int nr)
>  {
> -	struct platform_device *pdev = to_platform_device(dev);
> +	struct platform_device *pdev = to_platform_device(edma->dev);
>  	char name[6];
>  	int ret;
>  
> diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
> index 3080747..7197a58 100644
> --- a/include/linux/dma/edma.h
> +++ b/include/linux/dma/edma.h
> @@ -16,6 +16,7 @@
>  #define EDMA_MAX_RD_CH                                  8
>  
>  struct dw_edma;
> +struct dw_edma_chip;
>  
>  struct dw_edma_region {
>  	u64		paddr;
> @@ -41,7 +42,7 @@ struct dw_edma_region {
>   *			automatically.
>   */
>  struct dw_edma_plat_ops {
> -	int (*irq_vector)(struct device *dev, unsigned int nr);
> +	int (*irq_vector)(struct dw_edma_chip *chip, unsigned int nr);
>  	u64 (*pci_address)(struct device *dev, phys_addr_t cpu_addr);
>  };
>  
> -- 
> 2.7.4
>