From: Bjorn Helgaas <bhelgaas@google.com>
To: Yijing Wang <wangyijing@huawei.com>
Cc: Jiang Liu <jiang.liu@linux.intel.com>,
linux-pci@vger.kernel.org, Yinghai Lu <yinghai@kernel.org>,
linux-kernel@vger.kernel.org, Marc Zyngier <marc.zyngier@arm.com>,
linux-arm-kernel@lists.infradead.org,
Russell King <linux@arm.linux.org.uk>,
x86@kernel.org, Thomas Gleixner <tglx@linutronix.de>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Rusty Russell <rusty@rustcorp.com.au>,
Tony Luck <tony.luck@intel.com>,
linux-ia64@vger.kernel.org,
"David S. Miller" <davem@davemloft.net>,
Guan Xuetao <gxt@mprc.pku.edu.cn>,
linux-alpha@vger.kernel.org, linux-m68k@vger.kernel.org,
Liviu Dudau <liviu@dudau.co.uk>, Arnd Bergmann <arnd@arndb.de>,
Geert Uytterhoeven <geert@linux-m68k.org>
Subject: Re: [PATCH v4 12/30] PCI: Introduce pci_host_bridge_ops to support host specific operations
Date: Mon, 2 Mar 2015 21:03:01 -0600 [thread overview]
Message-ID: <20150303030301.GI11978@google.com> (raw)
In-Reply-To: <1424938344-4017-13-git-send-email-wangyijing@huawei.com>
On Thu, Feb 26, 2015 at 04:12:06PM +0800, Yijing Wang wrote:
> Now we have weak functions like pcibios_root_bridge_prepare()
> to setup pci host bridge, We could introduce pci_host_bridge_ops
> which contain host bridge specific ops to setup pci_host_bridge.
> Then host bridge driver could add pci_host_bridge_ops hooks
> intead of weak function to setup pci_host_bridge.
> This patch add following pci_host_bridge_ops hooks:
>
> pci_host_bridge_ops {
> /* set root bus speed, some platform need this like powerpc */
> void (*phb_set_root_bus_speed)(struct pci_host_bridge *host);
> /* setup pci_host_bridge before pci_host_bridge be added to driver core */
> int (*phb_prepare)(struct pci_host_bridge *host);
> /* platform specific of scan hook to scan pci device */
> void (*phb_of_scan_bus)(struct pci_host_bridge *);
> }
> We could easily extend it to support different host bridge
> specific operations.
>
> Signed-off-by: Yijing Wang <wangyijing@huawei.com>
> ...
> @@ -2050,10 +2052,13 @@ static struct pci_bus *__pci_scan_root_bus(
> pci_bus_insert_busn_res(b, b->number, 255);
> }
>
> - max = pci_scan_child_bus(b);
> -
> - if (!found)
> - pci_bus_update_busn_res_end(b, max);
> + if (host->ops && host->ops->phb_of_scan_bus) {
> + host->ops->phb_of_scan_bus(host);
The important thing here is not the use of OF (Open Firmware/Device Tree),
is it? Why would we want "_of_" in the function name? I assume the intent
is that this host bridge op performs the same function as
pci_scan_child_bus(), so I think the op should be called "scan_bus".
> + } else {
> + max = pci_scan_child_bus(b);
> + if (!found)
> + pci_bus_update_busn_res_end(b, max);
> + }
>
> return b;
> }
next prev parent reply other threads:[~2015-03-03 3:03 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-26 8:11 [PATCH v4 00/30] Refine PCI scan interfaces and make generic pci host bridge Yijing Wang
2015-02-26 8:11 ` [PATCH v4 01/30] PCI: Rip out pci_bus_add_devices() from pci_scan_bus() Yijing Wang
2015-03-02 23:41 ` Bjorn Helgaas
2015-03-03 1:12 ` Yijing Wang
2015-02-26 8:11 ` [PATCH v4 02/30] PCI: Rip out pci_bus_add_devices() from pci_scan_root_bus() Yijing Wang
2015-03-03 1:57 ` Bjorn Helgaas
2015-03-03 3:09 ` Yijing Wang
2015-02-26 8:11 ` [PATCH v4 03/30] xen/PCI: Don't use deprecated function pci_scan_bus_parented() Yijing Wang
2015-03-03 2:02 ` Bjorn Helgaas
2015-03-03 3:33 ` Yijing Wang
2015-02-26 8:11 ` [PATCH v4 04/30] PCI: Remove deprecated pci_scan_bus_parented() Yijing Wang
2015-02-26 8:11 ` [PATCH v4 05/30] PCI: Rename pci_scan_bus() to pci_scan_bus_legacy() Yijing Wang
2015-03-03 2:06 ` Bjorn Helgaas
2015-03-03 3:41 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 06/30] PCI: Combine PCI domain and bus number in u32 arg Yijing Wang
2015-02-26 8:12 ` [PATCH v4 07/30] PCI: Pass PCI domain number combined with root bus number Yijing Wang
2015-02-26 8:12 ` [PATCH v4 08/30] PCI: Introduce pci_host_assign_domain_nr() to assign domain Yijing Wang
2015-02-26 8:12 ` [PATCH v4 09/30] PCI: Separate pci_host_bridge creation out of pci_create_root_bus() Yijing Wang
2015-03-03 2:37 ` Bjorn Helgaas
2015-03-03 3:46 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 10/30] PCI: Introduce pci_host_bridge_list to manage host bridges Yijing Wang
2015-02-26 8:12 ` [PATCH v4 11/30] PCI: Save sysdata in pci_host_bridge drvdata Yijing Wang
2015-02-26 8:12 ` [PATCH v4 12/30] PCI: Introduce pci_host_bridge_ops to support host specific operations Yijing Wang
2015-03-03 2:50 ` Bjorn Helgaas
2015-03-03 8:08 ` Yijing Wang
2015-03-03 3:03 ` Bjorn Helgaas [this message]
2015-03-03 8:41 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 13/30] PCI: Introduce new scan function pci_scan_root_bridge() Yijing Wang
2015-03-03 2:52 ` Bjorn Helgaas
2015-03-03 8:12 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 14/30] PCI/x86: Refine pci_acpi_scan_root() with generic pci_host_bridge Yijing Wang
2015-02-26 8:12 ` [PATCH v4 15/30] PCI/IA64: " Yijing Wang
2015-02-26 8:12 ` [PATCH v4 16/30] PCI/IA64: Fix the build warning about pci_domain_nr() Yijing Wang
2015-03-03 2:56 ` Bjorn Helgaas
2015-03-03 8:35 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 17/30] PCI/powerpc: Rename pcibios_root_bridge_prepare() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 18/30] PCI/powerpc: Use pci_scan_root_bridge() for simplicity Yijing Wang
2015-02-26 8:12 ` [PATCH v4 19/30] PCI: Remove weak pcibios_root_bridge_prepare() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 20/30] PCI/sparc: Use pci_scan_root_bridge() for simplicity Yijing Wang
2015-03-03 3:10 ` Bjorn Helgaas
2015-03-03 8:49 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 21/30] PCI: Introduce pci_bus_child_max_busnr() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 22/30] PCI/Parisc: Use pci_scan_root_bus() for simplicity Yijing Wang
2015-03-03 3:24 ` Bjorn Helgaas
2015-03-03 9:31 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 23/30] PCI/mvebu: Use pci_common_init_dev() to simplify code Yijing Wang
2015-03-03 3:30 ` Bjorn Helgaas
2015-02-26 8:12 ` [PATCH v4 24/30] PCI/tegra: Remove redundant tegra_pcie_scan_bus() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 25/30] PCI/designware: Use pci_scan_root_bus() for simplicity Yijing Wang
2015-02-26 8:12 ` [PATCH v4 26/30] PCI/xgene: Use pci_scan_root_bus() instead of pci_create_root_bus() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 27/30] PCI: Rename __pci_create_root_bus() to pci_create_root_bus() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 28/30] PCI: Export find_pci_host_bridge() Yijing Wang
2015-03-03 3:40 ` Bjorn Helgaas
2015-03-03 9:35 ` Yijing Wang
2015-02-26 8:12 ` [PATCH v4 29/30] PCI: Remove platform specific pci_domain_nr() Yijing Wang
2015-02-26 8:12 ` [PATCH v4 30/30] PCI: Remove pci_bus_assign_domain_nr() Yijing Wang
2015-02-26 23:57 ` [PATCH v4 00/30] Refine PCI scan interfaces and make generic pci host bridge Bjorn Helgaas
2015-02-27 0:56 ` Yijing Wang
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