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

Bjorn Helgaas
2015-07-23T13:17:25Z

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@apm.com>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>

Acked-by: Bjorn Helgaas <bhelgaas@google.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
>