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Date: Wed, 22 Oct 2008 08:35:34 -0600
From: Bjorn Helgaas <bjorn.helgaas@...com>
To: Yu Zhao <yu.zhao@...el.com>
Cc: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"achiang@...com" <achiang@...com>,
"grundler@...isc-linux.org" <grundler@...isc-linux.org>,
"greg@...ah.com" <greg@...ah.com>, "mingo@...e.hu" <mingo@...e.hu>,
"jbarnes@...tuousgeek.org" <jbarnes@...tuousgeek.org>,
"matthew@....cx" <matthew@....cx>,
"randy.dunlap@...cle.com" <randy.dunlap@...cle.com>,
"rdreier@...co.com" <rdreier@...co.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"virtualization@...ts.linux-foundation.org"
<virtualization@...ts.linux-foundation.org>
Subject: Re: [PATCH 8/16 v6] PCI: add boot options to reassign resources
On Wednesday 22 October 2008 02:43:03 am Yu Zhao wrote:
> This patch adds boot options so user can reassign device resources
> of all devices under a bus.
>
> The boot options can be used as:
> pci=assign-mmio=0000:01,assign-pio=0000:02
> '[dddd:]bb' is the domain and bus number.
I think this example is incorrect because you look for ";" to
separate options, not ",".
Bjorn
> Cc: Alex Chiang <achiang@...com>
> Cc: Grant Grundler <grundler@...isc-linux.org>
> Cc: Greg KH <greg@...ah.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
> Cc: Matthew Wilcox <matthew@....cx>
> Cc: Randy Dunlap <randy.dunlap@...cle.com>
> Cc: Roland Dreier <rdreier@...co.com>
> Signed-off-by: Yu Zhao <yu.zhao@...el.com>
>
> ---
> arch/x86/pci/common.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++
> arch/x86/pci/i386.c | 10 ++++---
> arch/x86/pci/pci.h | 3 ++
> 3 files changed, 82 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index b67732b..06e1ce0 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -137,6 +137,72 @@ static void __devinit pcibios_fixup_device_resources(struct pci_dev *dev)
> }
> }
>
> +static char *pci_assign_pio;
> +static char *pci_assign_mmio;
> +
> +static int pcibios_bus_resource_needs_fixup(struct pci_bus *bus)
> +{
> + int i;
> + int type = 0;
> + int domain, busnr;
> +
> + if (!bus->self)
> + return 0;
> +
> + for (i = 0; i < 2; i++) {
> + char *str = i ? pci_assign_pio : pci_assign_mmio;
> +
> + while (str && *str) {
> + if (sscanf(str, "%04x:%02x", &domain, &busnr) != 2) {
> + if (sscanf(str, "%02x", &busnr) != 1)
> + break;
> + domain = 0;
> + }
> +
> + if (pci_domain_nr(bus) == domain &&
> + bus->number == busnr) {
> + type |= i ? IORESOURCE_IO : IORESOURCE_MEM;
> + break;
> + }
> +
> + str = strchr(str, ';');
> + if (str)
> + str++;
> + }
> + }
> +
> + return type;
> +}
> +
> +static void __devinit pcibios_fixup_bus_resources(struct pci_bus *bus)
> +{
> + int i;
> + int type = pcibios_bus_resource_needs_fixup(bus);
> +
> + if (!type)
> + return;
> +
> + for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
> + struct resource *res = bus->resource[i];
> +
> + if (!res)
> + continue;
> + if (res->flags & type)
> + res->flags = 0;
> + }
> +}
> +
> +int pcibios_resource_needs_fixup(struct pci_dev *dev, int resno)
> +{
> + struct pci_bus *bus;
> +
> + for (bus = dev->bus; bus && bus != pci_root_bus; bus = bus->parent)
> + if (pcibios_bus_resource_needs_fixup(bus))
> + return 1;
> +
> + return 0;
> +}
> +
> /*
> * Called after each bus is probed, but before its children
> * are examined.
> @@ -147,6 +213,7 @@ void __devinit pcibios_fixup_bus(struct pci_bus *b)
> struct pci_dev *dev;
>
> pci_read_bridge_bases(b);
> + pcibios_fixup_bus_resources(b);
> list_for_each_entry(dev, &b->devices, bus_list)
> pcibios_fixup_device_resources(dev);
> }
> @@ -519,6 +586,12 @@ char * __devinit pcibios_setup(char *str)
> } else if (!strcmp(str, "skip_isa_align")) {
> pci_probe |= PCI_CAN_SKIP_ISA_ALIGN;
> return NULL;
> + } else if (!strncmp(str, "assign-pio=", 11)) {
> + pci_assign_pio = str + 11;
> + return NULL;
> + } else if (!strncmp(str, "assign-mmio=", 12)) {
> + pci_assign_mmio = str + 12;
> + return NULL;
> }
> return str;
> }
> diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
> index 8729bde..ea82a5b 100644
> --- a/arch/x86/pci/i386.c
> +++ b/arch/x86/pci/i386.c
> @@ -169,10 +169,12 @@ static void __init pcibios_allocate_resources(int pass)
> (unsigned long long) r->start,
> (unsigned long long) r->end,
> r->flags, enabled, pass);
> - pr = pci_find_parent_resource(dev, r);
> - if (pr && !request_resource(pr, r))
> - continue;
> - dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
> + if (!pcibios_resource_needs_fixup(dev, idx)) {
> + pr = pci_find_parent_resource(dev, r);
> + if (pr && !request_resource(pr, r))
> + continue;
> + dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
> + }
> /* We'll assign a new address later */
> r->end -= r->start;
> r->start = 0;
> diff --git a/arch/x86/pci/pci.h b/arch/x86/pci/pci.h
> index 15b9cf6..f22737d 100644
> --- a/arch/x86/pci/pci.h
> +++ b/arch/x86/pci/pci.h
> @@ -117,6 +117,9 @@ extern int __init pcibios_init(void);
> extern int __init pci_mmcfg_arch_init(void);
> extern void __init pci_mmcfg_arch_free(void);
>
> +/* pci-common.c */
> +extern int pcibios_resource_needs_fixup(struct pci_dev *dev, int resno);
> +
> /*
> * AMD Fam10h CPUs are buggy, and cannot access MMIO config space
> * on their northbrige except through the * %eax register. As such, you MUST
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