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Date: Tue, 10 Nov 2009 17:07:48 +0900
From: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To: Yinghai Lu <yinghai@...nel.org>
CC: Jesse Barnes <jbarnes@...tuousgeek.org>,
"Eric W. Biederman" <ebiederm@...ssion.com>,
Alex Chiang <achiang@...com>,
Bjorn Helgaas <bjorn.helgaas@...com>,
Ingo Molnar <mingo@...e.hu>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>
Subject: Re: [PATCH 2/2] pci: pciehp update the slot bridge res to get big
range for pcie devices - v10
Can I ask which is the latest version?
I think -v10 is the latest. But I could not find -v10 for patch 1/2.
Thanks,
Kenji Kaneshige
Yinghai Lu wrote:
> move out bus_size_bridges and assign resources out of pciehp_add_bridge()
> and at last do them all together one time including slot bridge, to avoid to
> call assign resources several times, when there are several bridges under the
> slot bridge.
>
> need to introduce pci_bridge_assign_resources there.
>
> handle the case the slot bridge that doesn't get pre-allocated big enough res
> from FW.
> for example pcie devices need 256M, but the bridge only get preallocated 2M...
>
> pci_setup_bridge() will take extra check_enabled for the slot bridge, otherwise
> update res is not updated to bridge BAR. that is bridge is enabled already for
> port service.
>
> v2: address Alex's concern about pci remove/rescan feature about
> pci_setup_bridge changes.
> v3: Kenji pointed out that pci_config_slot need to be called before
> pci_bus_add_devices()
> v4: move out pci_is_enabled checkout of pci_setup_bridge()
> v5: change the applying sequence.
> v6: change the functions name according to Jesse
> v8: address Eric's concern, only overwrite leaf bridge resource that is not
> big enough
> v9: refresh to be applied after bjorn's patch, and remove trick about save
> size and restore resource second try.
> v10: alex found need to have export for pci_assign_unassigned_bridge_resources
>
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>
> ---
> drivers/pci/hotplug/pciehp_pci.c | 23 +++++-
> drivers/pci/setup-bus.c | 130 +++++++++++++++++++++++++++++++++++++--
> include/linux/pci.h | 1
> 3 files changed, 144 insertions(+), 10 deletions(-)
>
> Index: linux-2.6/drivers/pci/hotplug/pciehp_pci.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/hotplug/pciehp_pci.c
> +++ linux-2.6/drivers/pci/hotplug/pciehp_pci.c
> @@ -53,17 +53,15 @@ static int __ref pciehp_add_bridge(struc
> busnr = pci_scan_bridge(parent, dev, busnr, pass);
> if (!dev->subordinate)
> return -1;
> - pci_bus_size_bridges(dev->subordinate);
> - pci_bus_assign_resources(parent);
> - pci_enable_bridges(parent);
> - pci_bus_add_devices(parent);
> +
> return 0;
> }
>
> int pciehp_configure_device(struct slot *p_slot)
> {
> struct pci_dev *dev;
> - struct pci_bus *parent = p_slot->ctrl->pcie->port->subordinate;
> + struct pci_dev *bridge = p_slot->ctrl->pcie->port;
> + struct pci_bus *parent = bridge->subordinate;
> int num, fn;
> struct controller *ctrl = p_slot->ctrl;
>
> @@ -96,12 +94,25 @@ int pciehp_configure_device(struct slot
> (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
> pciehp_add_bridge(dev);
> }
> + pci_dev_put(dev);
> + }
> +
> + pci_assign_unassigned_bridge_resources(bridge);
> +
> + for (fn = 0; fn < 8; fn++) {
> + dev = pci_get_slot(parent, PCI_DEVFN(0, fn));
> + if (!dev)
> + continue;
> + if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
> + pci_dev_put(dev);
> + continue;
> + }
> pci_configure_slot(dev);
> pci_dev_put(dev);
> }
>
> - pci_bus_assign_resources(parent);
> pci_bus_add_devices(parent);
> +
> return 0;
> }
>
> Index: linux-2.6/drivers/pci/setup-bus.c
> ===================================================================
> --- linux-2.6.orig/drivers/pci/setup-bus.c
> +++ linux-2.6/drivers/pci/setup-bus.c
> @@ -68,6 +68,52 @@ static void free_failed_list(struct reso
> head->next = NULL;
> }
>
> +static void pdev_assign_resources_sorted(struct pci_dev *dev,
> + struct resource_list *fail_head)
> +{
> + struct resource *res;
> + struct resource_list head, *list, *tmp;
> + int idx;
> + u16 class = dev->class >> 8;
> +
> + head.next = NULL;
> +
> + /* Don't touch classless devices or host bridges or ioapics. */
> + if (class == PCI_CLASS_NOT_DEFINED || class == PCI_CLASS_BRIDGE_HOST)
> + return;
> +
> + /* Don't touch ioapic devices already enabled by firmware */
> + if (class == PCI_CLASS_SYSTEM_PIC) {
> + u16 command;
> + pci_read_config_word(dev, PCI_COMMAND, &command);
> + if (command & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY))
> + return;
> + }
> +
> + pdev_sort_resources(dev, &head);
> +
> + for (list = head.next; list;) {
> + res = list->res;
> + idx = res - &list->dev->resource[0];
> + if (pci_assign_resource(list->dev, idx)) {
> + if (fail_head && !list->dev->subordinate &&
> + !pci_is_root_bus(list->dev->bus)) {
> + /*
> + * device need to keep flags and size
> + * for second try
> + */
> + add_to_failed_list(fail_head, list->dev, res);
> + } else {
> + res->start = 0;
> + res->end = 0;
> + res->flags = 0;
> + }
> + }
> + tmp = list;
> + list = list->next;
> + kfree(tmp);
> + }
> +}
> static void pbus_assign_resources_sorted(const struct pci_bus *bus,
> struct resource_list *fail_head)
> {
> @@ -282,9 +328,6 @@ static void __pci_setup_bridge(struct pc
> {
> struct pci_dev *bridge = bus->self;
>
> - if (pci_is_enabled(bridge))
> - return;
> -
> dev_info(&bridge->dev, "PCI bridge to [bus %02x-%02x]\n",
> bus->secondary, bus->subordinate);
>
> @@ -645,7 +688,8 @@ static void __ref __pci_bus_assign_resou
>
> switch (dev->class >> 8) {
> case PCI_CLASS_BRIDGE_PCI:
> - pci_setup_bridge(b);
> + if (!pci_is_enabled(dev))
> + pci_setup_bridge(b);
> break;
>
> case PCI_CLASS_BRIDGE_CARDBUS:
> @@ -666,6 +710,34 @@ void __ref pci_bus_assign_resources(cons
> }
> EXPORT_SYMBOL(pci_bus_assign_resources);
>
> +static void __ref __pci_bridge_assign_resources(const struct pci_dev *bridge,
> + struct resource_list *fail_head)
> +{
> + struct pci_bus *b;
> +
> + pdev_assign_resources_sorted((struct pci_dev *)bridge, fail_head);
> +
> + b = bridge->subordinate;
> + if (!b)
> + return;
> +
> + __pci_bus_assign_resources(b, fail_head);
> +
> + switch (bridge->class >> 8) {
> + case PCI_CLASS_BRIDGE_PCI:
> + pci_setup_bridge(b);
> + break;
> +
> + case PCI_CLASS_BRIDGE_CARDBUS:
> + pci_setup_cardbus(b);
> + break;
> +
> + default:
> + dev_info(&bridge->dev, "not setting up bridge for bus "
> + "%04x:%02x\n", pci_domain_nr(b), b->number);
> + break;
> + }
> +}
> static void release_children_resource(struct resource *r)
> {
> struct resource *p;
> @@ -841,3 +913,53 @@ enable_and_dump:
> pci_bus_dump_resources(bus);
> }
> }
> +
> +void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge)
> +{
> + struct pci_bus *bus;
> + struct pci_bus *parent = bridge->subordinate;
> + bool second_tried = false;
> + struct resource_list head, *list, *tmp;
> + int retval;
> + unsigned long type_mask = IORESOURCE_IO | IORESOURCE_MEM |
> + IORESOURCE_PREFETCH;
> +
> +again:
> + head.next = NULL;
> +
> + pci_bus_size_bridges(parent);
> + pci_clear_master(bridge);
> + __pci_bridge_assign_resources(bridge, &head);
> + retval = pci_reenable_device(bridge);
> + pci_set_master(bridge);
> + pci_enable_bridges(parent);
> +
> + /* any device complain? */
> + if (!head.next)
> + return;
> +
> + if (second_tried) {
> + /* still fail, don't want to try more */
> + free_failed_list(&head);
> + return;
> + }
> +
> + second_tried = true;
> + printk(KERN_DEBUG "PCI: second try to assign unassigned res\n");
> +
> + /*
> + * Try to release leaf bridge's resources that doesn't fit resource of
> + * child device under that bridge
> + */
> + for (list = head.next; list;) {
> + bus = list->dev->bus;
> + pci_bus_release_unused_bridge_res(bus,
> + list->res->flags & type_mask);
> + tmp = list;
> + list = list->next;
> + kfree(tmp);
> + }
> +
> + goto again;
> +}
> +EXPORT_SYMBOL_GPL(pci_assign_unassigned_bridge_resources);
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -768,6 +768,7 @@ void pci_bus_assign_resources(const stru
> void pci_bus_size_bridges(struct pci_bus *bus);
> int pci_claim_resource(struct pci_dev *, int);
> void pci_assign_unassigned_resources(void);
> +void pci_assign_unassigned_bridge_resources(struct pci_dev *bridge);
> void pdev_enable_device(struct pci_dev *);
> void pdev_sort_resources(struct pci_dev *, struct resource_list *);
> int pci_enable_resources(struct pci_dev *, int mask);
>
>
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