From: Yijing Wang <wangyijing@huawei.com>
To: Liviu Dudau <Liviu.Dudau@arm.com>
Cc: Liviu Dudau <liviu@dudau.co.uk>, Tony Luck <tony.luck@intel.com>,
Russell King <linux@arm.linux.org.uk>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"huxinwei@huawei.com" <huxinwei@huawei.com>,
Thierry Reding <thierry.reding@gmail.com>,
"suravee.suthikulpanit@amd.com" <suravee.suthikulpanit@amd.com>,
Bjorn Helgaas <bhelgaas@google.com>,
"linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>, Wuyun <wuyun.wu@huawei.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [RFC PATCH 04/16] PCI: Rip out pci_bus_add_devices() from pci_scan_root_bus()
Date: Wed, 19 Nov 2014 09:21:32 +0800 [thread overview]
Message-ID: <546BF09C.4030209@huawei.com> (raw)
In-Reply-To: <20141118143402.GJ12037@e106497-lin.cambridge.arm.com>
On 2014/11/18 22:34, Liviu Dudau wrote:
> 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.
OK, I will separately this one out of this series.
>
> Best regards,
> Liviu
>
>>
>> Signed-off-by: Yijing Wang <wangyijing@huawei.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
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-pci" in
>> the body of a message to majordomo@vger.kernel.org
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>>
>
--
Thanks!
Yijing
next prev parent reply other threads:[~2014-11-19 1:21 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-17 10:21 [RFC PATCH 00/16] Refine PCI host bridge scan interfaces Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 01/16] PCI: Enhance pci_scan_root_bus() to support default IO/MEM resources Yijing Wang
2014-11-17 10:08 ` Arnd Bergmann
2014-11-18 7:44 ` Yijing Wang
2014-11-18 9:36 ` Arnd Bergmann
2014-11-18 11:46 ` Yijing Wang
2014-11-18 14:23 ` Liviu Dudau
2014-11-19 1:15 ` Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 02/16] PCI: Use pci_scan_root_bus() instead of pci_scan_bus() Yijing Wang
2014-11-18 14:28 ` Liviu Dudau
2014-11-19 1:19 ` Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 03/16] PCI: Clean up pci_scan_bus() Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 04/16] PCI: Rip out pci_bus_add_devices() from pci_scan_root_bus() Yijing Wang
2014-11-18 14:34 ` Liviu Dudau
2014-11-19 1:21 ` Yijing Wang [this message]
2014-11-17 10:21 ` [RFC PATCH 05/16] PCI: Use pci_scan_root_bus() instead of pci_scan_bus_parented() Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 06/16] PCI: Use u32 type to combine PCI domain and bus number Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 07/16] PCI: Separate pci_host_bridge creation out of pci_create_root_bus() Yijing Wang
2014-11-17 10:56 ` Arnd Bergmann
2014-11-18 8:32 ` Yijing Wang
2014-11-18 9:30 ` Arnd Bergmann
2014-11-18 11:44 ` Yijing Wang
2014-11-18 12:25 ` Arnd Bergmann
2014-11-18 12:41 ` Yijing Wang
2014-11-18 14:48 ` Liviu Dudau
2014-11-19 2:24 ` Yijing Wang
2014-11-19 16:29 ` Liviu Dudau
2014-11-20 2:00 ` Yijing Wang
2014-11-18 15:30 ` Liviu Dudau
2014-11-19 1:42 ` Yijing Wang
2014-11-19 16:37 ` Liviu Dudau
2014-11-20 2:47 ` Yijing Wang
2014-11-20 9:47 ` Liviu Dudau
2014-11-21 2:53 ` Yijing Wang
2014-11-21 9:53 ` Liviu Dudau
2014-11-17 10:21 ` [RFC PATCH 08/16] PCI: Introduce pci_scan_host_bridge() and pci_host_info Yijing Wang
2014-11-18 15:42 ` Liviu Dudau
2014-11-19 2:09 ` Yijing Wang
2014-11-19 16:41 ` Liviu Dudau
2014-11-20 2:54 ` Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 09/16] PCI: Associate .get_msi_ctrl() with pci_host_bridge Yijing Wang
2014-11-17 15:03 ` Lorenzo Pieralisi
2014-11-17 10:21 ` [RFC PATCH 10/16] PCI: Add of_scan_bus() to pci_host_info Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 11/16] x86/PCI: Use pci_scan_host_bridge() instead of pci_create_root_bus() Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 12/16] ia64/PCI: Remove the redundant bus variable Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 13/16] ia64/PCI: Use pci_scan_host_bridge() to refactor pci_acpi_scan_root() Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 14/16] arm/PCI: Introduce pci_get_domain_nr() Yijing Wang
2014-11-17 12:08 ` Lorenzo Pieralisi
2014-11-18 0:55 ` Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 15/16] arm/PCI: Use pci_scan_host_bridge() instead of pci_scan_root_bus() Yijing Wang
2014-11-17 10:21 ` [RFC PATCH 16/16] powerpc/PCI: Use pci_scan_host_bridge() to scan PCI bus Yijing Wang
2014-11-17 14:13 ` [RFC PATCH 00/16] Refine PCI host bridge scan interfaces Arnd Bergmann
2014-11-18 11:17 ` Yijing Wang
2014-11-18 11:30 ` Arnd Bergmann
2014-11-18 11:45 ` Lorenzo Pieralisi
2014-11-18 12:14 ` Yijing Wang
2014-11-18 12:17 ` Yijing Wang
2014-11-18 12:27 ` Arnd Bergmann
2014-11-20 12:01 ` Tomasz Nowicki
2014-11-20 13:15 ` Arnd Bergmann
2014-11-20 11:54 ` Tomasz Nowicki
2014-11-20 12:08 ` Liviu Dudau
2014-11-20 12:53 ` Tomasz Nowicki
2014-11-20 16:39 ` Liviu Dudau
2014-11-21 2:58 ` Yijing Wang
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