On Tue, Jul 3, 2012 at 8:16 PM, Taku Izumi <izumi.taku@xxxxxxxxxxxxxx> wrote:
>
> Currently I/O ports and I/O memory resources are reserved for
> hotplug bridges and we can tune their size by using hpiosize
> and hpmemsize boot option.
>
> This patch extends feature so that we can reserve additional
> bus number resources for hotplug bridges and tune it by
> using "hpbussize" option.
>
> Signed-off-by: Taku Izumi <izumi.taku@xxxxxxxxxxxxxx>
> ---
> Documentation/kernel-parameters.txt | 4 ++++
> drivers/pci/pci.c | 6 +++++-
> drivers/pci/probe.c | 4 ++++
> include/linux/pci.h | 1 +
> 4 files changed, 14 insertions(+), 1 deletion(-)
>
> Index: linux/drivers/pci/pci.c
> ===================================================================
> --- linux.orig/drivers/pci/pci.c 2012-06-26 14:37:22.000000000 +0900
> +++ linux/drivers/pci/pci.c 2012-07-04 10:00:50.708002757 +0900
> @@ -74,9 +74,11 @@ unsigned long pci_cardbus_mem_size = DEF
>
> #define DEFAULT_HOTPLUG_IO_SIZE (256)
> #define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
> -/* pci=hpmemsize=nnM,hpiosize=nn can override this */
> +#define DEFAULT_HOTPLUG_BUS_SIZE (0)
> +/* pci=hpmemsize=nnM,hpiosize=nn,hpbussize=n can override this */
> unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE;
> unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE;
> +unsigned int pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE;
>
> enum pcie_bus_config_types pcie_bus_config = PCIE_BUS_TUNE_OFF;
>
> @@ -4022,6 +4024,8 @@ static int __init pci_setup(char *str)
> pci_hotplug_io_size = memparse(str + 9, &str);
> } else if (!strncmp(str, "hpmemsize=", 10)) {
> pci_hotplug_mem_size = memparse(str + 10, &str);
> + } else if (!strncmp(str, "hpbussize=", 10)) {
> + pci_hotplug_bus_size = memparse(str + 10, &str);
> } else if (!strncmp(str, "pcie_bus_tune_off", 17)) {
> pcie_bus_config = PCIE_BUS_TUNE_OFF;
> } else if (!strncmp(str, "pcie_bus_safe", 13)) {
> Index: linux/drivers/pci/probe.c
> ===================================================================
> --- linux.orig/drivers/pci/probe.c 2012-06-26 14:37:22.000000000 +0900
> +++ linux/drivers/pci/probe.c 2012-07-04 10:00:50.718002632 +0900
> @@ -867,6 +867,10 @@ int __devinit pci_scan_bridge(struct pci
> /*
> * Set the subordinate bus number to its real value.
> */
> + if (dev->is_hotplug_bridge) {
> + if (max + pci_hotplug_bus_size < child->busn_res.end)
> + max += pci_hotplug_bus_size;
> + }
again, that adding is not safe.
please drop this one now.
or you can prepare one against busn_alloc and I put new version in the
busn_alloc branch.
Thanks
Yinghai
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