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

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Message-ID: <ff55a1e9-0998-685f-2d2c-e6cf522b0988@ti.com>
Date:   Fri, 8 Feb 2019 10:16:59 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....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

Hi Lorenzo,

On 07/02/19 10:18 PM, Lorenzo Pieralisi wrote:
> 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 ?

I added here only to avoid breaking "git bisect". Next patch adds
ks_pcie_msi_irq_chip in msi_host_init of keystone. However till then it has to
use dw_pci_msi_bottom_irq_chip. Adding anywhere else in dw_pcie_host_init would
mean msi_irq_chip is uninitialized for keystone.

Maybe I can add that in the commit log and move it to dw_pcie_host_init?

Thanks
Kishon