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Date: Tue, 27 Oct 2015 15:10:12 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: jakeo@...rosoft.com, gregkh@...uxfoundation.org, kys@...rosoft.com,
linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
tglx@...utronix.de, haiyangz@...rosoft.com, marc.zyngier@....com,
bhelgaas@...gle.com, linux-pci@...r.kernel.org
Subject: Re: [PATCH v3 4/7] PCI: Record an fwnode associated with root PCI
buses, optionally
On 2015/10/27 7:15, jakeo@...rosoft.com wrote:
> From: Jake Oshins <jakeo@...rosoft.com>
>
> This patch allows a PCI front-end implementation to supply an fwnode_handle
> associated with a root PCI bus, optionally. If supplied, the PCI driver
> records this.
>
> This patch supports the next patch in the series, which looks up an IRQ domain
> through this handle.
Hi JaKeo,
Instead of changing the pci_create_root_bus() interface,
how about packing fwnode into sysdata, then we may
either 1) introduce a helper to retrieve fwnode from sysdata
or 2) set host_bridge->fwnode = sysdata in function
pcibios_root_bridge_prepare.
Thanks,
Gerry
>
> Signed-off-by: Jake Oshins <jakeo@...rosoft.com>
> ---
> arch/sparc/kernel/pci.c | 2 +-
> drivers/acpi/pci_root.c | 2 +-
> drivers/parisc/lba_pci.c | 2 +-
> drivers/pci/host/pci-xgene.c | 2 +-
> drivers/pci/host/pcie-iproc.c | 3 ++-
> drivers/pci/probe.c | 8 +++++---
> include/linux/pci.h | 4 +++-
> 7 files changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
> index b91d7f1..3d4e9f9 100644
> --- a/arch/sparc/kernel/pci.c
> +++ b/arch/sparc/kernel/pci.c
> @@ -660,7 +660,7 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
> pbm->busn.flags = IORESOURCE_BUS;
> pci_add_resource(&resources, &pbm->busn);
> bus = pci_create_root_bus(parent, pbm->pci_first_busno, pbm->pci_ops,
> - pbm, &resources);
> + pbm, &resources, NULL);
> if (!bus) {
> printk(KERN_ERR "Failed to create bus for %s\n",
> node->full_name);
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index 850d7bf..eab95bc 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -840,7 +840,7 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
> pci_acpi_root_add_resources(info);
> pci_add_resource(&info->resources, &root->secondary);
> bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
> - sysdata, &info->resources);
> + sysdata, &info->resources, NULL);
> if (!bus)
> goto out_release_info;
>
> diff --git a/drivers/parisc/lba_pci.c b/drivers/parisc/lba_pci.c
> index a32c1f6..a7b9d5c 100644
> --- a/drivers/parisc/lba_pci.c
> +++ b/drivers/parisc/lba_pci.c
> @@ -1567,7 +1567,7 @@ lba_driver_probe(struct parisc_device *dev)
> dev->dev.platform_data = lba_dev;
> lba_bus = lba_dev->hba.hba_bus =
> pci_create_root_bus(&dev->dev, lba_dev->hba.bus_num.start,
> - cfg_ops, NULL, &resources);
> + cfg_ops, NULL, &resources, NULL);
> if (!lba_bus) {
> pci_free_resource_list(&resources);
> return 0;
> diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
> index ae00ce2..95c20c8 100644
> --- a/drivers/pci/host/pci-xgene.c
> +++ b/drivers/pci/host/pci-xgene.c
> @@ -545,7 +545,7 @@ static int xgene_pcie_probe_bridge(struct platform_device *pdev)
> return ret;
>
> bus = pci_create_root_bus(&pdev->dev, 0,
> - &xgene_pcie_ops, port, &res);
> + &xgene_pcie_ops, port, &res, NULL);
> if (!bus)
> return -ENOMEM;
>
> diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
> index 9193951..bc999b7 100644
> --- a/drivers/pci/host/pcie-iproc.c
> +++ b/drivers/pci/host/pcie-iproc.c
> @@ -357,7 +357,8 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
> sysdata = pcie;
> #endif
>
> - bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, sysdata, res);
> + bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, sysdata, res,
> + NULL);
> if (!bus) {
> dev_err(pcie->dev, "unable to create PCI root bus\n");
> ret = -ENOMEM;
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index f441d1b..c0f2e44 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2039,7 +2039,8 @@ void __weak pcibios_remove_bus(struct pci_bus *bus)
> }
>
> struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> - struct pci_ops *ops, void *sysdata, struct list_head *resources)
> + struct pci_ops *ops, void *sysdata, struct list_head *resources,
> + struct fwnode_handle *fwnode)
> {
> int error;
> struct pci_host_bridge *bridge;
> @@ -2069,6 +2070,7 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> if (!bridge)
> goto err_out;
>
> + bridge->fwnode = fwnode;
> bridge->dev.parent = parent;
> bridge->dev.release = pci_release_host_bridge_dev;
> dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
> @@ -2223,7 +2225,7 @@ struct pci_bus *pci_scan_root_bus_msi(struct device *parent, int bus,
> break;
> }
>
> - b = pci_create_root_bus(parent, bus, ops, sysdata, resources);
> + b = pci_create_root_bus(parent, bus, ops, sysdata, resources, NULL);
> if (!b)
> return NULL;
>
> @@ -2261,7 +2263,7 @@ struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
> pci_add_resource(&resources, &ioport_resource);
> pci_add_resource(&resources, &iomem_resource);
> pci_add_resource(&resources, &busn_resource);
> - b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources);
> + b = pci_create_root_bus(NULL, bus, ops, sysdata, &resources, NULL);
> if (b) {
> pci_scan_child_bus(b);
> } else {
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index b54fbf1..86ce5fa 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -409,6 +409,7 @@ struct pci_host_bridge {
> struct device dev;
> struct pci_bus *bus; /* root bus */
> struct list_head windows; /* resource_entry */
> + struct fwnode_handle *fwnode;
> void (*release_fn)(struct pci_host_bridge *);
> void *release_data;
> unsigned int ignore_reset_delay:1; /* for entire hierarchy */
> @@ -789,7 +790,8 @@ void pci_bus_add_devices(const struct pci_bus *bus);
> struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops, void *sysdata);
> struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
> struct pci_ops *ops, void *sysdata,
> - struct list_head *resources);
> + struct list_head *resources,
> + struct fwnode_handle *fwnode);
> int pci_bus_insert_busn_res(struct pci_bus *b, int bus, int busmax);
> int pci_bus_update_busn_res_end(struct pci_bus *b, int busmax);
> void pci_bus_release_busn_res(struct pci_bus *b);
>
--
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