Re: [PATCH v6 07/30] PCI: Pass PCI domain number combined with root bus number

[Yijing Wang <wangyijing@huawei.com>]

On 2015/3/12 9:34, Bjorn Helgaas wrote:
> On Mon, Mar 09, 2015 at 10:34:04AM +0800, Yijing Wang wrote:
>> Now we could pass PCI domain combined with bus number
>> in u32 argu. Because in arm/arm64, PCI domain number
>> is assigned by pci_bus_assign_domain_nr(). So we leave
>> pci_scan_root_bus() and pci_create_root_bus() in arm/arm64
>> unchanged.
> 
> I'm not buying this.  If you're using this PCI_DOMBUS() thing (and I'm not
> convinced that's a good idea yet), I'm not happy with most code being
> 
>   pci_scan_root_bus(..., PCI_DOMBUS(hose->index, next_busno), ...)

Yes, it looks a little ugly. Which do you prefer, use a container structure or
put all args into function directly ?


> 
> but ARM being
> 
>   pci_scan_root_bus(..., sys->busnr, ...)
> 
> That just looks like a mistake.  Make ARM use PCI_DOMBUS(0, sys->busnr) if
> you want, but at least make it look like you did a thorough job.

For arm, I assumed the pci_host_assign_domain_nr() would update its domain,
but it may made the code obscure.

> 
>> A new function pci_host_assign_domain_nr()
>> will be introduced for arm/arm64 to assign domain number
>> in later patch.
>>
>> Signed-off-by: Yijing Wang <wangyijing@huawei.com>
>> CC: Richard Henderson <rth@twiddle.net>
>> CC: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
>> CC: Matt Turner <mattst88@gmail.com>
>> CC: Tony Luck <tony.luck@intel.com>
>> CC: Fenghua Yu <fenghua.yu@intel.com>
>> CC: Michal Simek <monstr@monstr.eu>
>> CC: Ralf Baechle <ralf@linux-mips.org>
>> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
>> CC: Paul Mackerras <paulus@samba.org>
>> CC: Michael Ellerman <mpe@ellerman.id.au>
>> CC: Sebastian Ott <sebott@linux.vnet.ibm.com>
>> CC: Gerald Schaefer <gerald.schaefer@de.ibm.com>
>> CC: "David S. Miller" <davem@davemloft.net>
>> CC: Chris Metcalf <cmetcalf@ezchip.com>
>> CC: Thomas Gleixner <tglx@linutronix.de>
>> CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
>> CC: linux-alpha@vger.kernel.org
>> CC: linux-kernel@vger.kernel.org
>> CC: linux-ia64@vger.kernel.org
>> CC: linux-mips@linux-mips.org
>> CC: linuxppc-dev@lists.ozlabs.org
>> CC: linux-s390@vger.kernel.org
>> CC: linux-sh@vger.kernel.org
>> CC: sparclinux@vger.kernel.org
>> CC: xen-devel@lists.xenproject.org
>> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>> ---
>>  arch/alpha/kernel/pci.c          |    5 +++--
>>  arch/alpha/kernel/sys_nautilus.c |    4 ++--
>>  arch/ia64/pci/pci.c              |    4 ++--
>>  arch/ia64/sn/kernel/io_init.c    |    5 +++--
>>  arch/microblaze/pci/pci-common.c |    5 +++--
>>  arch/mips/pci/pci.c              |    4 ++--
>>  arch/powerpc/kernel/pci-common.c |    5 +++--
>>  arch/s390/pci/pci.c              |    5 +++--
>>  arch/sh/drivers/pci/pci.c        |    5 +++--
>>  arch/sparc/kernel/pci.c          |    5 +++--
>>  arch/tile/kernel/pci.c           |    5 +++--
>>  arch/tile/kernel/pci_gx.c        |    5 +++--
>>  arch/x86/pci/acpi.c              |    7 ++++---
>>  arch/x86/pci/common.c            |    3 ++-
>>  drivers/pci/xen-pcifront.c       |    5 +++--
>>  15 files changed, 42 insertions(+), 30 deletions(-)
>>
>> diff --git a/arch/alpha/kernel/pci.c b/arch/alpha/kernel/pci.c
>> index 5c845ad..deb0a36 100644
>> --- a/arch/alpha/kernel/pci.c
>> +++ b/arch/alpha/kernel/pci.c
>> @@ -336,8 +336,9 @@ common_init_pci(void)
>>  		pci_add_resource_offset(&resources, hose->mem_space,
>>  					hose->mem_space->start);
>>  
>> -		bus = pci_scan_root_bus(NULL, next_busno, alpha_mv.pci_ops,
>> -					hose, &resources);
>> +		bus = pci_scan_root_bus(NULL,
>> +				PCI_DOMBUS(hose->index, next_busno),
>> +				alpha_mv.pci_ops, hose, &resources);
>>  		if (!bus)
>>  			continue;
>>  		hose->bus = bus;
>> diff --git a/arch/alpha/kernel/sys_nautilus.c b/arch/alpha/kernel/sys_nautilus.c
>> index 700686d..be0bbeb 100644
>> --- a/arch/alpha/kernel/sys_nautilus.c
>> +++ b/arch/alpha/kernel/sys_nautilus.c
>> @@ -206,10 +206,10 @@ nautilus_init_pci(void)
>>  	unsigned long memtop = max_low_pfn << PAGE_SHIFT;
>>  
>>  	/* Scan our single hose.  */
>> -	bus = pci_scan_bus(0, alpha_mv.pci_ops, hose);
>> +	bus = pci_scan_bus(PCI_DOMBUS(hose->index, 0),
>> +			alpha_mv.pci_ops, hose);
>>  	if (!bus)
>>  		return;
>> -
>>  	hose->bus = bus;
>>  	pcibios_claim_one_bus(bus);
>>  
>> diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
>> index 48cc657..675749f 100644
>> --- a/arch/ia64/pci/pci.c
>> +++ b/arch/ia64/pci/pci.c
>> @@ -465,8 +465,8 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
>>  	 * should handle the case here, but it appears that IA64 hasn't
>>  	 * such quirk. So we just ignore the case now.
>>  	 */
>> -	pbus = pci_create_root_bus(NULL, bus, &pci_root_ops, controller,
>> -				   &info->resources);
>> +	pbus = pci_create_root_bus(NULL, PCI_DOMBUS(domain, bus),
>> +			&pci_root_ops, controller, &info->resources);
>>  	if (!pbus) {
>>  		pci_free_resource_list(&info->resources);
>>  		__release_pci_root_info(info);
>> diff --git a/arch/ia64/sn/kernel/io_init.c b/arch/ia64/sn/kernel/io_init.c
>> index 1be65eb..7e0b7f9 100644
>> --- a/arch/ia64/sn/kernel/io_init.c
>> +++ b/arch/ia64/sn/kernel/io_init.c
>> @@ -266,8 +266,9 @@ sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
>>  	pci_add_resource_offset(&resources,	&res[1],
>>  			prom_bussoft_ptr->bs_legacy_mem);
>>  
>> -	bus = pci_scan_root_bus(NULL, busnum, &pci_root_ops, controller,
>> -				&resources);
>> +	bus = pci_scan_root_bus(NULL,
>> +			PCI_DOMBUS(controller->segment, busnum),
>> +			&pci_root_ops, controller, &resources);
>>   	if (bus == NULL) {
>>  		kfree(res);
>>  		kfree(controller);
>> diff --git a/arch/microblaze/pci/pci-common.c b/arch/microblaze/pci/pci-common.c
>> index 6d8d173..34a32ec 100644
>> --- a/arch/microblaze/pci/pci-common.c
>> +++ b/arch/microblaze/pci/pci-common.c
>> @@ -1350,8 +1350,9 @@ static void pcibios_scan_phb(struct pci_controller *hose)
>>  
>>  	pcibios_setup_phb_resources(hose, &resources);
>>  
>> -	bus = pci_scan_root_bus(hose->parent, hose->first_busno,
>> -				hose->ops, hose, &resources);
>> +	bus = pci_scan_root_bus(hose->parent,
>> +			PCI_DOMBUS(hose->global_number, hose->first_busno),
>> +			hose->ops, hose, &resources);
>>  	if (bus == NULL) {
>>  		pr_err("Failed to create bus for PCI domain %04x\n",
>>  		       hose->global_number);
>> diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
>> index 9eb54b5..86f8d2b 100644
>> --- a/arch/mips/pci/pci.c
>> +++ b/arch/mips/pci/pci.c
>> @@ -92,8 +92,8 @@ static void pcibios_scanbus(struct pci_controller *hose)
>>  	pci_add_resource_offset(&resources,
>>  				hose->mem_resource, hose->mem_offset);
>>  	pci_add_resource_offset(&resources, hose->io_resource, hose->io_offset);
>> -	bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
>> -				&resources);
>> +	bus = pci_scan_root_bus(NULL, PCI_DOMBUS(hose->index, next_busno),
>> +			hose->pci_ops, hose, &resources);
>>  	if (!bus)
>>  		pci_free_resource_list(&resources);
>>  
>> diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
>> index 2a525c9..a467aca 100644
>> --- a/arch/powerpc/kernel/pci-common.c
>> +++ b/arch/powerpc/kernel/pci-common.c
>> @@ -1612,8 +1612,9 @@ void pcibios_scan_phb(struct pci_controller *hose)
>>  	pci_add_resource(&resources, &hose->busn);
>>  
>>  	/* Create an empty bus for the toplevel */
>> -	bus = pci_create_root_bus(hose->parent, hose->first_busno,
>> -				  hose->ops, hose, &resources);
>> +	bus = pci_create_root_bus(hose->parent,
>> +			PCI_DOMBUS(hose->global_number, hose->first_busno),
>> +			hose->ops, hose, &resources);
>>  	if (bus == NULL) {
>>  		pr_err("Failed to create bus for PCI domain %04x\n",
>>  			hose->global_number);
>> diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c
>> index a2a7391..20e662f 100644
>> --- a/arch/s390/pci/pci.c
>> +++ b/arch/s390/pci/pci.c
>> @@ -770,8 +770,9 @@ static int zpci_scan_bus(struct zpci_dev *zdev)
>>  	if (ret)
>>  		return ret;
>>  
>> -	zdev->bus = pci_scan_root_bus(NULL, ZPCI_BUS_NR, &pci_root_ops,
>> -				      zdev, &resources);
>> +	zdev->bus = pci_scan_root_bus(NULL,
>> +			PCI_DOMBUS(zdev->domain, ZPCI_BUS_NR), &pci_root_ops,
>> +			zdev, &resources);
>>  	if (!zdev->bus) {
>>  		zpci_cleanup_bus_resources(zdev);
>>  		return -EIO;
>> diff --git a/arch/sh/drivers/pci/pci.c b/arch/sh/drivers/pci/pci.c
>> index efc1051..116f80f 100644
>> --- a/arch/sh/drivers/pci/pci.c
>> +++ b/arch/sh/drivers/pci/pci.c
>> @@ -52,8 +52,9 @@ static void pcibios_scanbus(struct pci_channel *hose)
>>  		pci_add_resource_offset(&resources, res, offset);
>>  	}
>>  
>> -	bus = pci_scan_root_bus(NULL, next_busno, hose->pci_ops, hose,
>> -				&resources);
>> +	bus = pci_scan_root_bus(NULL,
>> +			PCI_DOMBUS(hose->index, next_busno),
>> +			hose->pci_ops, hose, &resources);
>>  	hose->bus = bus;
>>  
>>  	need_domain_info = need_domain_info || hose->index;
>> diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c
>> index 9ce5afe..838fe1e 100644
>> --- a/arch/sparc/kernel/pci.c
>> +++ b/arch/sparc/kernel/pci.c
>> @@ -667,8 +667,9 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
>>  	pbm->busn.end	= pbm->pci_last_busno;
>>  	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);
>> +	bus = pci_create_root_bus(parent,
>> +			PCI_DOMBUS(pbm->index, pbm->pci_first_busno),
>> +			pbm->pci_ops, pbm, &resources);
>>  	if (!bus) {
>>  		printk(KERN_ERR "Failed to create bus for %s\n",
>>  		       node->full_name);
>> diff --git a/arch/tile/kernel/pci.c b/arch/tile/kernel/pci.c
>> index 9475a74..25b0d9b 100644
>> --- a/arch/tile/kernel/pci.c
>> +++ b/arch/tile/kernel/pci.c
>> @@ -306,8 +306,9 @@ int __init pcibios_init(void)
>>  
>>  			pci_add_resource(&resources, &ioport_resource);
>>  			pci_add_resource(&resources, &iomem_resource);
>> -			bus = pci_scan_root_bus(NULL, 0, controller->ops,
>> -						controller, &resources);
>> +			bus = pci_scan_root_bus(NULL,
>> +				PCI_DOMBUS(controller->index, 0),
>> +				controller->ops, controller, &resources);
>>  			controller->root_bus = bus;
>>  			controller->last_busno = bus->busn_res.end;
>>  		}
>> diff --git a/arch/tile/kernel/pci_gx.c b/arch/tile/kernel/pci_gx.c
>> index b1df847..f6f41f3 100644
>> --- a/arch/tile/kernel/pci_gx.c
>> +++ b/arch/tile/kernel/pci_gx.c
>> @@ -881,8 +881,9 @@ int __init pcibios_init(void)
>>  					controller->mem_offset);
>>  		pci_add_resource(&resources, &controller->io_space);
>>  		controller->first_busno = next_busno;
>> -		bus = pci_scan_root_bus(NULL, next_busno, controller->ops,
>> -					controller, &resources);
>> +		bus = pci_scan_root_bus(NULL,
>> +				PCI_DOMBUS(controller->index, next_busno),
>> +				controller->ops, controller, &resources);
>>  		controller->root_bus = bus;
>>  		next_busno = bus->busn_res.end + 1;
>>  	}
>> diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
>> index 6ac2738..ad0e926 100644
>> --- a/arch/x86/pci/acpi.c
>> +++ b/arch/x86/pci/acpi.c
>> @@ -424,9 +424,10 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
>>  		}
>>  
>>  		if (!setup_mcfg_map(info, domain, (u8)root->secondary.start,
>> -				    (u8)root->secondary.end, root->mcfg_addr))
>> -			bus = pci_create_root_bus(NULL, busnum, &pci_root_ops,
>> -						  sd, &resources);
>> +				(u8)root->secondary.end, root->mcfg_addr))
>> +			bus = pci_create_root_bus(NULL,
>> +				PCI_DOMBUS(domain, busnum), &pci_root_ops,
>> +				sd, &resources);
>>  
>>  		if (bus) {
>>  			pci_scan_child_bus(bus);
>> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
>> index 0cbc723..0160280 100644
>> --- a/arch/x86/pci/common.c
>> +++ b/arch/x86/pci/common.c
>> @@ -486,7 +486,8 @@ void pcibios_scan_root(int busnum)
>>  	sd->node = x86_pci_root_bus_node(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);
>> +	bus = pci_scan_root_bus(NULL, PCI_DOMBUS(0, busnum),
>> +			&pci_root_ops, sd, &resources);
>>  	if (!bus) {
>>  		pci_free_resource_list(&resources);
>>  		kfree(sd);
>> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
>> index 9e7c28b..af6144a 100644
>> --- a/drivers/pci/xen-pcifront.c
>> +++ b/drivers/pci/xen-pcifront.c
>> @@ -479,8 +479,9 @@ static int pcifront_scan_root(struct pcifront_device *pdev,
>>  
>>  	pci_lock_rescan_remove();
>>  
>> -	b = pci_scan_root_bus(&pdev->xdev->dev, bus,
>> -				  &pcifront_bus_ops, sd, &resources);
>> +	b = pci_scan_root_bus(&pdev->xdev->dev,
>> +			PCI_DOMBUS(sd->domain, bus),
>> +			&pcifront_bus_ops, sd, &resources);
>>  	if (!b) {
>>  		dev_err(&pdev->xdev->dev,
>>  			"Error creating PCI Frontend Bus!\n");
>> -- 
>> 1.7.1
>>
>> --
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> 
> .
> 


-- 
Thanks!
Yijing