linux-kernel - Re: [PATCH v2 6/9] PCI: dwc: Add support to use non default msi_irq

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Message-ID: <20190207164853.GD21111@e107981-ln.cambridge.arm.com>
Date:   Thu, 7 Feb 2019 16:48:53 +0000
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Murali Karicheri <m-karicheri2@...com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/9] PCI: dwc: Add support to use non default
 msi_irq_chip

On Thu, Feb 07, 2019 at 04:39:21PM +0530, Kishon Vijay Abraham I wrote:
> Platforms using Designware IP uses dw_pci_msi_bottom_irq_chip for
> configuring the MSI controller logic within the Designware IP. However
> certain platforms like Keystone (K2G) which uses Desingware IP has
> it's own MSI controller logic. For handling such platforms,
> the irqchip ops uses msi_irq_ack, msi_set_irq, msi_clear_irq callback
> functions.
> 
> Add support to use different msi_irq_chip with default as
> dw_pci_msi_bottom_irq_chip. This is in preparation to get rid off
> msi_irq_ack, msi_set_irq, msi_clear_irq and other Keystone specific
> dw_pcie_host_ops. This will also help to get rid of get_msi_addr and
> get_msi_data ops.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/controller/dwc/pcie-designware-host.c | 5 ++++-
>  drivers/pci/controller/dwc/pcie-designware.h      | 1 +
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
> index 721d60a5d9e4..042de09b0451 100644
> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
> @@ -245,7 +245,7 @@ static int dw_pcie_irq_domain_alloc(struct irq_domain *domain,
>  
>  	for (i = 0; i < nr_irqs; i++)
>  		irq_domain_set_info(domain, virq + i, bit + i,
> -				    &dw_pci_msi_bottom_irq_chip,
> +				    pp->msi_irq_chip,
>  				    pp, handle_edge_irq,
>  				    NULL, NULL);
>  
> @@ -277,6 +277,9 @@ int dw_pcie_allocate_domains(struct pcie_port *pp)
>  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  	struct fwnode_handle *fwnode = of_node_to_fwnode(pci->dev->of_node);
>  
> +	if (!pp->msi_irq_chip)
> +		pp->msi_irq_chip = &dw_pci_msi_bottom_irq_chip;

I think it is better to initialize pp->msi_irq_chip outside
dw_pcie_allocate_domains(), it makes things clearer.

In:

dw_pcie_host_init() for dwc

or

msi_host_init() for platforms with that hook implemented.

Is there any gotcha I am missing ?

Lorenzo

> +
>  	pp->irq_domain = irq_domain_create_linear(fwnode, pp->num_vectors,
>  					       &dw_pcie_msi_domain_ops, pp);
>  	if (!pp->irq_domain) {
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 1f56e6ae34ff..95e0c3c93f48 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -176,6 +176,7 @@ struct pcie_port {
>  	struct irq_domain	*irq_domain;
>  	struct irq_domain	*msi_domain;
>  	dma_addr_t		msi_data;
> +	struct irq_chip		*msi_irq_chip;
>  	u32			num_vectors;
>  	u32			irq_status[MAX_MSI_CTRLS];
>  	raw_spinlock_t		lock;
> -- 
> 2.17.1
>