linux-kernel - Re: [PATCH v5 18/19] PCI/MSI: pci-xgene-msi: Get rid of struct msi

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Date:	Thu, 23 Jul 2015 08:17:08 -0500
From:	Bjorn Helgaas <bhelgaas@...gle.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>, Duc Dang <dhdang@....com>,
	linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, Yijing Wang <wangyijing@...wei.com>,
	Ma Jun <majun258@...wei.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v5 18/19] PCI/MSI: pci-xgene-msi: Get rid of struct
 msi_controller

Subject: "PCI/MSI: xgene: Get rid of ..."

On Thu, Jul 23, 2015 at 10:26:37AM +0100, Marc Zyngier wrote:
> The XGene MSI driver only uses the msi_controller structure as

s/XGene/X-Gene/

> a way to match the host bridge  with its MSI HW, and thus the
> msi_domain.
> 
> But now that we can directly associate an msi_domain with a device,
> there is no use keeping this msi_controller around.
> 
> Just remove all traces of msi_controller from the driver.
> 
> Tested-by: Duc Dang <dhdang@....com>
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  drivers/pci/host/pci-xgene-msi.c | 41 ++++++++++++++++------------------------
>  1 file changed, 16 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-xgene-msi.c b/drivers/pci/host/pci-xgene-msi.c
> index 2d31d4d..ec5a14b 100644
> --- a/drivers/pci/host/pci-xgene-msi.c
> +++ b/drivers/pci/host/pci-xgene-msi.c
> @@ -40,8 +40,8 @@ struct xgene_msi_group {
>  
>  struct xgene_msi {
>  	struct device_node	*node;
> -	struct msi_controller	mchip;
> -	struct irq_domain	*domain;
> +	struct irq_domain	*inner_domain;
> +	struct irq_domain	*msi_domain;
>  	u64			msi_addr;
>  	void __iomem		*msi_regs;
>  	unsigned long		*bitmap;
> @@ -252,17 +252,17 @@ static const struct irq_domain_ops msi_domain_ops = {
>  
>  static int xgene_allocate_domains(struct xgene_msi *msi)
>  {
> -	msi->domain = irq_domain_add_linear(NULL, NR_MSI_VEC,
> -					    &msi_domain_ops, msi);
> -	if (!msi->domain)
> +	msi->inner_domain = irq_domain_add_linear(NULL, NR_MSI_VEC,
> +						  &msi_domain_ops, msi);
> +	if (!msi->inner_domain)
>  		return -ENOMEM;
>  
> -	msi->mchip.domain = pci_msi_create_irq_domain(msi->mchip.of_node,
> -						      &xgene_msi_domain_info,
> -						      msi->domain);
> +	msi->msi_domain = pci_msi_create_irq_domain(msi->node,
> +						    &xgene_msi_domain_info,
> +						    msi->inner_domain);
>  
> -	if (!msi->mchip.domain) {
> -		irq_domain_remove(msi->domain);
> +	if (!msi->msi_domain) {
> +		irq_domain_remove(msi->inner_domain);
>  		return -ENOMEM;
>  	}
>  
> @@ -271,10 +271,10 @@ static int xgene_allocate_domains(struct xgene_msi *msi)
>  
>  static void xgene_free_domains(struct xgene_msi *msi)
>  {
> -	if (msi->mchip.domain)
> -		irq_domain_remove(msi->mchip.domain);
> -	if (msi->domain)
> -		irq_domain_remove(msi->domain);
> +	if (msi->msi_domain)
> +		irq_domain_remove(msi->msi_domain);
> +	if (msi->inner_domain)
> +		irq_domain_remove(msi->inner_domain);
>  }
>  
>  static int xgene_msi_init_allocator(struct xgene_msi *xgene_msi)
> @@ -340,7 +340,7 @@ static void xgene_msi_isr(unsigned int irq, struct irq_desc *desc)
>  			 * CPU0
>  			 */
>  			hw_irq = hwirq_to_canonical_hwirq(hw_irq);
> -			virq = irq_find_mapping(xgene_msi->domain, hw_irq);
> +			virq = irq_find_mapping(xgene_msi->inner_domain, hw_irq);
>  			WARN_ON(!virq);
>  			if (virq != 0)
>  				generic_handle_irq(virq);
> @@ -497,7 +497,7 @@ static int xgene_msi_probe(struct platform_device *pdev)
>  		goto error;
>  	}
>  	xgene_msi->msi_addr = res->start;
> -
> +	xgene_msi->node = pdev->dev.of_node;
>  	xgene_msi->num_cpus = num_possible_cpus();
>  
>  	rc = xgene_msi_init_allocator(xgene_msi);
> @@ -561,19 +561,10 @@ static int xgene_msi_probe(struct platform_device *pdev)
>  
>  	cpu_notifier_register_done();
>  
> -	xgene_msi->mchip.of_node = pdev->dev.of_node;
> -	rc = of_pci_msi_chip_add(&xgene_msi->mchip);
> -	if (rc) {
> -		dev_err(&pdev->dev, "failed to add MSI controller chip\n");
> -		goto error_notifier;
> -	}
> -
>  	dev_info(&pdev->dev, "APM X-Gene PCIe MSI driver loaded\n");
>  
>  	return 0;
>  
> -error_notifier:
> -	unregister_hotcpu_notifier(&xgene_msi_cpu_notifier);
>  error:
>  	xgene_msi_remove(pdev);
>  	return rc;
> -- 
> 2.1.4
> 
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