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SubjectRe: [PATCH 1/2] pci: pciehp update the slot bridge res to get big range for pcie devices - v4
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()
>
> Signed-off-by: Yinghai Lu <yinghai@kernel.org>
>
> ---
> drivers/pci/hotplug/pciehp_pci.c | 29 ++++++++++++---
> drivers/pci/setup-bus.c | 73 ++++++++++++++++++++++++++++++++++++---
> include/linux/pci.h | 1
> 3 files changed, 93 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
> @@ -53,19 +53,18 @@ 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;
> + int retval;
>
> dev = pci_get_slot(parent, PCI_DEVFN(0, 0));
> if (dev) {
> @@ -96,12 +95,30 @@ int pciehp_configure_device(struct slot
> (dev->hdr_type == PCI_HEADER_TYPE_CARDBUS)) {
> pciehp_add_bridge(dev);
> }
> + pci_dev_put(dev);
> + }
> +
> + pci_bus_size_bridges(parent);
> + pci_clear_master(bridge);
> + pci_bridge_assign_resources(bridge);
> + retval = pci_reenable_device(bridge);
> + pci_set_master(bridge);
> + pci_enable_bridges(parent);
> +
> + 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
> @@ -27,6 +27,44 @@
> #include <linux/slab.h>
> #include "pci.h"
>
> +static void pdev_assign_resources_sorted(struct pci_dev *dev)
> +{
> + 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)) {
> + 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 pci_dev *dev;
> @@ -144,9 +182,6 @@ static void pci_setup_bridge(struct pci_
> u32 l, bu, lu, io_upper16;
> int pref_mem64;
>
> - if (pci_is_enabled(bridge))
> - return;
> -
> dev_info(&bridge->dev, "PCI bridge, secondary bus %04x:%02x\n",
> pci_domain_nr(bus), bus->number);
>
> @@ -541,6 +576,35 @@ void __ref pci_bus_size_bridges(struct p
> }
> EXPORT_SYMBOL(pci_bus_size_bridges);
>
> +void __ref pci_bridge_assign_resources(const struct pci_dev *bridge)
> +{
> + struct pci_bus *b;
> +
> + pdev_assign_resources_sorted((struct pci_dev *)bridge);
> +
> + b = bridge->subordinate;
> + if (!b)
> + return;
> +
> + pci_bus_assign_resources(b);
> +
> + 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;
> + }
> +}
> +EXPORT_SYMBOL(pci_bridge_assign_resources);
> +
> void __ref pci_bus_assign_resources(const struct pci_bus *bus)
> {
> struct pci_bus *b;
> @@ -557,7 +621,8 @@ void __ref pci_bus_assign_resources(cons
>
> 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:
> Index: linux-2.6/include/linux/pci.h
> ===================================================================
> --- linux-2.6.orig/include/linux/pci.h
> +++ linux-2.6/include/linux/pci.h
> @@ -756,6 +756,7 @@ ssize_t pci_write_vpd(struct pci_dev *de
> int pci_vpd_truncate(struct pci_dev *dev, size_t size);
>
> /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
> +void pci_bridge_assign_resources(const struct pci_dev *bridge);
> void pci_bus_assign_resources(const struct pci_bus *bus);
> void pci_bus_size_bridges(struct pci_bus *bus);
> int pci_claim_resource(struct pci_dev *, int);
>

Does this patch work without [PATCH 2/2]? I don't understand who
releases resouces? Does find_free_bus_resource() still release
resources?

Thanks,
Kenji Kaneshige




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