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Message-ID: <20141118143402.GJ12037@e106497-lin.cambridge.arm.com>
Date: Tue, 18 Nov 2014 14:34:02 +0000
From: Liviu Dudau <Liviu.Dudau@....com>
To: Yijing Wang <wangyijing@...wei.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"huxinwei@...wei.com" <huxinwei@...wei.com>,
Wuyun <wuyun.wu@...wei.com>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
Russell King <linux@....linux.org.uk>,
"x86@...nel.org" <x86@...nel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
Tony Luck <tony.luck@...el.com>,
"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
Thierry Reding <thierry.reding@...il.com>,
Liviu Dudau <liviu@...au.co.uk>,
"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>
Subject: Re: [RFC PATCH 04/16] PCI: Rip out pci_bus_add_devices() from
pci_scan_root_bus()
On Mon, Nov 17, 2014 at 10:21:38AM +0000, Yijing Wang wrote:
> Rip out pci_bus_add_devices() from pci_scan_root_bus()
> for following reasons.
> 1. pci_scan_root_bus() means we only do the scan, we should
> not add pci busses.
> 2. A lots of drviers which use pci_scan_root_bus() call
> pci_bus_size_bridges(), pci_bus_assign_resources() after
> pci_scan_root_bus(). But strictly speaking pci_bus_add_devices()
> should be called after the resources assignment.
This looks like a nice cleanup! Can we split this patch out
of the series and start the ball running on getting ACKs
for it? You are touching a lot of drivers here, you probably
don't want the whole series to wait on approvals for this.
Best regards,
Liviu
>
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> ---
> arch/alpha/kernel/pci.c | 1 +
> arch/alpha/kernel/sys_nautilus.c | 1 +
> arch/frv/mb93090-mb00/pci-vdk.c | 8 +++++---
> arch/ia64/sn/kernel/io_init.c | 2 ++
> arch/m68k/coldfire/pci.c | 1 +
> arch/microblaze/pci/pci-common.c | 2 +-
> arch/mips/pci/pci.c | 1 +
> arch/mn10300/unit-asb2305/pci.c | 7 +++++--
> arch/s390/pci/pci.c | 2 +-
> arch/sh/drivers/pci/pci.c | 1 +
> arch/sparc/kernel/leon_pci.c | 1 +
> arch/sparc/kernel/pcic.c | 2 ++
> arch/tile/kernel/pci.c | 3 ++-
> arch/tile/kernel/pci_gx.c | 3 ++-
> arch/unicore32/kernel/pci.c | 2 +-
> arch/x86/pci/common.c | 10 ++++++----
> arch/xtensa/kernel/pci.c | 1 +
> drivers/pci/host/pci-xgene.c | 2 +-
> drivers/pci/hotplug/ibmphp_core.c | 6 ++++--
> drivers/pci/probe.c | 1 -
> 20 files changed, 39 insertions(+), 18 deletions(-)
>
> diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
> index 076c35c..81251a5 100644
> --- a/arch/alpha/kernel/pci.c
> +++ b/arch/alpha/kernel/pci.c
> @@ -349,6 +349,7 @@ common_init_pci(void)
>
> pci_assign_unassigned_resources();
> pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
> + pci_bus_add_devices(bus);
> }
>
>
> diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c
> index 1047ab3..60fbd77 100644
> --- a/arch/alpha/kernel/sys_nautilus.c
> +++ b/arch/alpha/kernel/sys_nautilus.c
> @@ -253,6 +253,7 @@ nautilus_init_pci(void)
> for the root bus, so just clear it. */
> bus->self = NULL;
> pci_fixup_irqs(alpha_mv.pci_swizzle, alpha_mv.pci_map_irq);
> + pci_bus_add_devices(bus);
> }
>
> /*
> diff --git a/arch/frv/mb93090-mb00/pci-vdk.c b/arch/frv/mb93090-mb00/pci-vdk.c
> index efa5d65..85f87dc 100644
> --- a/arch/frv/mb93090-mb00/pci-vdk.c
> +++ b/arch/frv/mb93090-mb00/pci-vdk.c
> @@ -316,6 +316,7 @@ void pcibios_fixup_bus(struct pci_bus *bus)
>
> int __init pcibios_init(void)
> {
> + struct pci_bus *bus = NULL;
> struct pci_ops *dir = NULL;
> LIST_HEAD(resources);
>
> @@ -383,12 +384,13 @@ int __init pcibios_init(void)
> printk("PCI: Probing PCI hardware\n");
> pci_add_resource(&resources, &pci_ioport_resource);
> pci_add_resource(&resources, &pci_iomem_resource);
> - pci_scan_root_bus(NULL, 0, pci_root_ops, NULL, &resources);
> -
> + bus = pci_scan_root_bus(NULL, 0, pci_root_ops, NULL, &resources);
> + if (!bus)
> + return -ENXIO;
> pcibios_irq_init();
> pcibios_fixup_irqs();
> pcibios_resource_survey();
> -
> + pci_bus_add_devices(bus);
> return 0;
> }
>
> diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
> index 0b5ce82..1be65eb 100644
> --- a/arch/ia64/sn/kernel/io_init.c
> +++ b/arch/ia64/sn/kernel/io_init.c
> @@ -271,7 +271,9 @@ sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
> if (bus == NULL) {
> kfree(res);
> kfree(controller);
> + return;
> }
> + pci_bus_add_devices(bus);
> }
>
> /*
> diff --git a/arch/m68k/coldfire/pci.c b/arch/m68k/coldfire/pci.c
> index 4d242fb..840a431 100644
> --- a/arch/m68k/coldfire/pci.c
> +++ b/arch/m68k/coldfire/pci.c
> @@ -319,6 +319,7 @@ static int __init mcf_pci_init(void)
> pci_fixup_irqs(pci_common_swizzle, mcf_pci_map_irq);
> pci_bus_size_bridges(rootbus);
> pci_bus_assign_resources(rootbus);
> + pci_bus_add_devices(rootbus);
> return 0;
> }
>
> diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
> index 9037914..9ca7e3f 100644
> --- a/arch/microblaze/pci/pci-common.c
> +++ b/arch/microblaze/pci/pci-common.c
> @@ -1344,8 +1344,8 @@ static void pcibios_scan_phb(struct pci_controller *hose)
> }
> bus->busn_res.start = hose->first_busno;
> hose->bus = bus;
> -
> hose->last_busno = bus->busn_res.end;
> + pci_bus_add_devices(bus);
> }
>
> static int __init pcibios_init(void)
> diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
> index 1bf60b1..f083688 100644
> --- a/arch/mips/pci/pci.c
> +++ b/arch/mips/pci/pci.c
> @@ -113,6 +113,7 @@ static void pcibios_scanbus(struct pci_controller *hose)
> if (!pci_has_flag(PCI_PROBE_ONLY)) {
> pci_bus_size_bridges(bus);
> pci_bus_assign_resources(bus);
> + pci_bus_add_devices(bus);
> }
> }
> }
> diff --git a/arch/mn10300/unit-asb2305/pci.c b/arch/mn10300/unit-asb2305/pci.c
> index 6b4339f..011af54 100644
> --- a/arch/mn10300/unit-asb2305/pci.c
> +++ b/arch/mn10300/unit-asb2305/pci.c
> @@ -345,6 +345,7 @@ void pcibios_fixup_bus(struct pci_bus *bus)
> */
> static int __init pcibios_init(void)
> {
> + struct pci_bus *bus;
> resource_size_t io_offset, mem_offset;
> LIST_HEAD(resources);
>
> @@ -376,11 +377,13 @@ static int __init pcibios_init(void)
>
> pci_add_resource_offset(&resources, &pci_ioport_resource, io_offset);
> pci_add_resource_offset(&resources, &pci_iomem_resource, mem_offset);
> - pci_scan_root_bus(NULL, 0, &pci_direct_ampci, NULL, &resources);
> -
> + bus = pci_scan_root_bus(NULL, 0, &pci_direct_ampci, NULL, &resources);
> + if (!bus)
> + return 0;
> pcibios_irq_init();
> pcibios_fixup_irqs();
> pcibios_resource_survey();
> + pci_bus_add_devices(bus);
> return 0;
> }
>
> diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
> index 2fa7b14..016ea48 100644
> --- a/arch/s390/pci/pci.c
> +++ b/arch/s390/pci/pci.c
> @@ -755,7 +755,7 @@ static int zpci_scan_bus(struct zpci_dev *zdev)
> zpci_cleanup_bus_resources(zdev);
> return -EIO;
> }
> -
> + pci_bus_add_devices(zdev->bus);
> zdev->bus->max_bus_speed = zdev->max_bus_speed;
> return 0;
> }
> diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
> index 1bc09ee..efc1051 100644
> --- a/arch/sh/drivers/pci/pci.c
> +++ b/arch/sh/drivers/pci/pci.c
> @@ -69,6 +69,7 @@ static void pcibios_scanbus(struct pci_channel *hose)
>
> pci_bus_size_bridges(bus);
> pci_bus_assign_resources(bus);
> + pci_bus_add_devices(bus);
> } else {
> pci_free_resource_list(&resources);
> }
> diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.c
> index 899b720..2971076 100644
> --- a/arch/sparc/kernel/leon_pci.c
> +++ b/arch/sparc/kernel/leon_pci.c
> @@ -40,6 +40,7 @@ void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info)
>
> /* Assign devices with resources */
> pci_assign_unassigned_resources();
> + pci_bus_add_devices(root_bus);
> } else {
> pci_free_resource_list(&resources);
> }
> diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c
> index 64aafac..5457814 100644
> --- a/arch/sparc/kernel/pcic.c
> +++ b/arch/sparc/kernel/pcic.c
> @@ -392,6 +392,8 @@ static void __init pcic_pbm_scan_bus(struct linux_pcic *pcic)
>
> pbm->pci_bus = pci_scan_root_bus(NULL, pbm->pci_first_busno,
> &pcic_ops, pbm, NULL);
> + if (pbm->pci_bus)
> + pci_bus_add_devices(pbm->pci_bus);
> #if 0 /* deadwood transplanted from sparc64 */
> pci_fill_in_pbm_cookies(pbm->pci_bus, pbm, pbm->prom_node);
> pci_record_assignments(pbm, pbm->pci_bus);
> diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
> index 1f80a88..268423e 100644
> --- a/arch/tile/kernel/pci.c
> +++ b/arch/tile/kernel/pci.c
> @@ -326,7 +326,8 @@ int __init pcibios_init(void)
>
> /* Configure the max_read_size and max_payload_size values. */
> fixup_read_and_payload_sizes();
> -
> + if (bus)
> + pci_bus_add_devices(bus);
> /* Record the I/O resources in the PCI controller structure. */
> for (i = 0; i < TILE_NUM_PCIE; i++) {
> /*
> diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
> index e39f9c5..5f05a9a 100644
> --- a/arch/tile/kernel/pci_gx.c
> +++ b/arch/tile/kernel/pci_gx.c
> @@ -903,7 +903,8 @@ int __init pcibios_init(void)
> * associated with the devices read in above.
> */
> pci_assign_unassigned_resources();
> -
> + if (bus)
> + pci_bus_add_devices(bus);
> /* Record the I/O resources in the PCI controller structure. */
> for (i = 0; i < num_rc_controllers; i++) {
> struct pci_controller *controller = &pci_controllers[i];
> diff --git a/arch/unicore32/kernel/pci.c b/arch/unicore32/kernel/pci.c
> index be0f261..0d4c563 100644
> --- a/arch/unicore32/kernel/pci.c
> +++ b/arch/unicore32/kernel/pci.c
> @@ -270,11 +270,11 @@ static int __init pci_common_init(void)
> * Size the bridge windows.
> */
> pci_bus_size_bridges(puv3_bus);
> -
> /*
> * Assign resources.
> */
> pci_bus_assign_resources(puv3_bus);
> + pci_bus_add_devices(puv3_bus);
> }
>
> return 0;
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index 7b20bcc..b16632b 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -471,10 +471,12 @@ void pcibios_scan_root(int busnum)
> x86_pci_root_bus_resources(busnum, &resources);
> printk(KERN_DEBUG "PCI: Probing PCI hardware (bus %02x)\n", busnum);
> bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, sd, &resources);
> - if (!bus) {
> - pci_free_resource_list(&resources);
> - kfree(sd);
> - }
> + if (bus) {
> + pci_bus_add_devices(bus);
> + return;
> + }
> + pci_free_resource_list(&resources);
> + kfree(sd);
> }
>
> void __init pcibios_set_cache_line_size(void)
> diff --git a/arch/xtensa/kernel/pci.c b/arch/xtensa/kernel/pci.c
> index 5b34033..c4b5b5d 100644
> --- a/arch/xtensa/kernel/pci.c
> +++ b/arch/xtensa/kernel/pci.c
> @@ -185,6 +185,7 @@ static int __init pcibios_init(void)
> pci_controller_apertures(pci_ctrl, &resources);
> bus = pci_scan_root_bus(NULL, pci_ctrl->first_busno,
> pci_ctrl->ops, pci_ctrl, &resources);
> + pci_bus_add_devices(bus);
> pci_ctrl->bus = bus;
> pci_ctrl->last_busno = bus->busn_res.end;
> if (next_busno <= pci_ctrl->last_busno)
> diff --git a/drivers/pci/host/pci-xgene.c b/drivers/pci/host/pci-xgene.c
> index 9ecabfa..e7a4f66 100644
> --- a/drivers/pci/host/pci-xgene.c
> +++ b/drivers/pci/host/pci-xgene.c
> @@ -634,7 +634,7 @@ static int xgene_pcie_probe_bridge(struct platform_device *pdev)
> bus = pci_scan_root_bus(&pdev->dev, 0, &xgene_pcie_ops, port, &res);
> if (!bus)
> return -ENOMEM;
> -
> + pci_bus_add_devices(bus);
> platform_set_drvdata(pdev, port);
> return 0;
> }
> diff --git a/drivers/pci/hotplug/ibmphp_core.c b/drivers/pci/hotplug/ibmphp_core.c
> index b486432..76ce157 100644
> --- a/drivers/pci/hotplug/ibmphp_core.c
> +++ b/drivers/pci/hotplug/ibmphp_core.c
> @@ -740,7 +740,7 @@ static void ibm_unconfigure_device(struct pci_func *func)
> */
> static u8 bus_structure_fixup(u8 busno)
> {
> - struct pci_bus *bus;
> + struct pci_bus *bus, *b;
> struct pci_dev *dev;
> u16 l;
>
> @@ -767,7 +767,9 @@ static u8 bus_structure_fixup(u8 busno)
> (l != 0x0000) && (l != 0xffff)) {
> debug("%s - Inside bus_structure_fixup()\n",
> __func__);
> - pci_scan_root_bus(NULL, busno, ibmphp_pci_bus->ops, NULL, NULL);
> + b = pci_scan_root_bus(NULL, busno, ibmphp_pci_bus->ops, NULL, NULL);
> + if (b)
> + pci_bus_add_devices(b);
> break;
> }
> }
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 0a02fc2..97711f3 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2101,7 +2101,6 @@ struct pci_bus *pci_scan_root_bus(struct device *parent, int bus,
> if (!found)
> pci_bus_update_busn_res_end(b, max);
>
> - pci_bus_add_devices(b);
> return b;
> }
> EXPORT_SYMBOL(pci_scan_root_bus);
> --
> 1.7.1
>
> --
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