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Date: Tue, 17 Mar 2015 10:45:57 +0530
From: Manish Jaggi <mjaggi@...iumnetworks.com>
To: Yijing Wang <wangyijing@...wei.com>,
Bjorn Helgaas <bhelgaas@...gle.com>
CC: <linux-mips@...ux-mips.org>, <linux-ia64@...r.kernel.org>,
<linux-sh@...r.kernel.org>, <linux-pci@...r.kernel.org>,
<sparclinux@...r.kernel.org>, Chris Metcalf <cmetcalf@...hip.com>,
"Paul Mackerras" <paulus@...ba.org>,
Guan Xuetao <gxt@...c.pku.edu.cn>,
<linux-s390@...r.kernel.org>,
Russell King <linux@....linux.org.uk>,
"Michael Ellerman" <mpe@...erman.id.au>, <x86@...nel.org>,
Sebastian Ott <sebott@...ux.vnet.ibm.com>,
Geert Uytterhoeven <geert@...ux-m68k.org>,
Gerald Schaefer <gerald.schaefer@...ibm.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
<xen-devel@...ts.xenproject.org>, Matt Turner <mattst88@...il.com>,
Fenghua Yu <fenghua.yu@...el.com>,
Arnd Bergmann <arnd@...db.de>,
Marc Zyngier <marc.zyngier@....com>,
Rusty Russell <rusty@...tcorp.com.au>,
<linux-m68k@...ts.linux-m68k.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Thomas Gleixner <tglx@...utronix.de>,
Yinghai Lu <yinghai@...nel.org>,
<linux-arm-kernel@...ts.infradead.org>,
"Richard Henderson" <rth@...ddle.net>,
Liviu Dudau <liviu@...au.co.uk>,
Michal Simek <monstr@...str.eu>,
Tony Luck <tony.luck@...el.com>,
<linux-kernel@...r.kernel.org>, Ralf Baechle <ralf@...ux-mips.org>,
Jiang Liu <jiang.liu@...ux.intel.com>,
<linux-alpha@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
"David S. Miller" <davem@...emloft.net>
Subject: Re: [Xen-devel] [PATCH v6 07/30] PCI: Pass PCI domain number combined
with root bus number
On Monday 09 March 2015 08:04 AM, 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. A new function pci_host_assign_domain_nr()
> will be introduced for arm/arm64 to assign domain number
> in later patch.
Hi,
I think these changes might not be required. We have made very few
changes in the xen-pcifront to support PCI passthrough in arm64.
As per xen architecture for a domU only a single pci virtual bus is
created and all passthrough devices are attached to it.
-manish
>
> Signed-off-by: Yijing Wang <wangyijing@...wei.com>
> CC: Richard Henderson <rth@...ddle.net>
> CC: Ivan Kokshaysky <ink@...assic.park.msu.ru>
> CC: Matt Turner <mattst88@...il.com>
> CC: Tony Luck <tony.luck@...el.com>
> CC: Fenghua Yu <fenghua.yu@...el.com>
> CC: Michal Simek <monstr@...str.eu>
> CC: Ralf Baechle <ralf@...ux-mips.org>
> CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> CC: Paul Mackerras <paulus@...ba.org>
> CC: Michael Ellerman <mpe@...erman.id.au>
> CC: Sebastian Ott <sebott@...ux.vnet.ibm.com>
> CC: Gerald Schaefer <gerald.schaefer@...ibm.com>
> CC: "David S. Miller" <davem@...emloft.net>
> CC: Chris Metcalf <cmetcalf@...hip.com>
> CC: Thomas Gleixner <tglx@...utronix.de>
> CC: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> CC: linux-alpha@...r.kernel.org
> CC: linux-kernel@...r.kernel.org
> CC: linux-ia64@...r.kernel.org
> CC: linux-mips@...ux-mips.org
> CC: linuxppc-dev@...ts.ozlabs.org
> CC: linux-s390@...r.kernel.org
> CC: linux-sh@...r.kernel.org
> CC: sparclinux@...r.kernel.org
> CC: xen-devel@...ts.xenproject.org
> Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.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");
--
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