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![Bjorn Helgaas](/assets/img/avatar_default.png)
c770cb4cb5
("PCI: Mark invalid BARs as unassigned") sets IORESOURCE_UNSET if we fail to claim a resource. If we tried to claim a bridge window, failed, clipped the window, and tried to claim the clipped window, we failed again because of IORESOURCE_UNSET: pci_bus 0000:00: root bus resource [mem 0xc0000000-0xffffffff window] pci 0000:00:01.0: can't claim BAR 15 [mem 0xbdf00000-0xddefffff 64bit pref]: no compatible bridge window pci 0000:00:01.0: [mem size 0x20000000 64bit pref] clipped to [mem size 0x1df00000 64bit pref] pci 0000:00:01.0: bridge window [mem size 0x1df00000 64bit pref] pci 0000:00:01.0: can't claim BAR 15 [mem size 0x1df00000 64bit pref]: no address assigned The 00:01.0 window started as [mem 0xbdf00000-0xddefffff 64bit pref]. That starts before the host bridge window [mem 0xc0000000-0xffffffff window], so we clipped the 00:01.0 window to [mem 0xc0000000-0xddefffff 64bit pref]. But we left it marked IORESOURCE_UNSET, so the second claim failed when it should have succeeded. This means downstream devices will also fail for lack of resources, e.g., in the bugzilla below, radeon 0000:01:00.0: Fatal error during GPU init Clear IORESOURCE_UNSET when we clip a bridge window. Also clear IORESOURCE_UNSET in our copy of the unclipped window so we can see exactly what the original window was and how it now fits inside the upstream window. Fixes:c770cb4cb5
("PCI: Mark invalid BARs as unassigned") Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491#c47 Based-on-patch-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Based-on-patch-by: Yinghai Lu <yinghai@kernel.org> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Yinghai Lu <yinghai@kernel.org> CC: stable@vger.kernel.org # v4.1+
388 lines
9.4 KiB
C
388 lines
9.4 KiB
C
/*
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* drivers/pci/bus.c
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*
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* From setup-res.c, by:
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* Dave Rusling (david.rusling@reo.mts.dec.com)
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* David Mosberger (davidm@cs.arizona.edu)
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* David Miller (davem@redhat.com)
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* Ivan Kokshaysky (ink@jurassic.park.msu.ru)
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/errno.h>
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#include <linux/ioport.h>
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#include <linux/proc_fs.h>
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#include <linux/slab.h>
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#include "pci.h"
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void pci_add_resource_offset(struct list_head *resources, struct resource *res,
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resource_size_t offset)
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{
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struct resource_entry *entry;
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entry = resource_list_create_entry(res, 0);
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if (!entry) {
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printk(KERN_ERR "PCI: can't add host bridge window %pR\n", res);
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return;
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}
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entry->offset = offset;
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resource_list_add_tail(entry, resources);
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}
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EXPORT_SYMBOL(pci_add_resource_offset);
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void pci_add_resource(struct list_head *resources, struct resource *res)
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{
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pci_add_resource_offset(resources, res, 0);
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}
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EXPORT_SYMBOL(pci_add_resource);
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void pci_free_resource_list(struct list_head *resources)
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{
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resource_list_free(resources);
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}
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EXPORT_SYMBOL(pci_free_resource_list);
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void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
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unsigned int flags)
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{
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struct pci_bus_resource *bus_res;
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bus_res = kzalloc(sizeof(struct pci_bus_resource), GFP_KERNEL);
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if (!bus_res) {
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dev_err(&bus->dev, "can't add %pR resource\n", res);
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return;
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}
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bus_res->res = res;
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bus_res->flags = flags;
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list_add_tail(&bus_res->list, &bus->resources);
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}
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struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n)
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{
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struct pci_bus_resource *bus_res;
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if (n < PCI_BRIDGE_RESOURCE_NUM)
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return bus->resource[n];
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n -= PCI_BRIDGE_RESOURCE_NUM;
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list_for_each_entry(bus_res, &bus->resources, list) {
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if (n-- == 0)
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return bus_res->res;
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(pci_bus_resource_n);
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void pci_bus_remove_resources(struct pci_bus *bus)
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{
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int i;
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struct pci_bus_resource *bus_res, *tmp;
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for (i = 0; i < PCI_BRIDGE_RESOURCE_NUM; i++)
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bus->resource[i] = NULL;
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list_for_each_entry_safe(bus_res, tmp, &bus->resources, list) {
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list_del(&bus_res->list);
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kfree(bus_res);
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}
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}
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static struct pci_bus_region pci_32_bit = {0, 0xffffffffULL};
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#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
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static struct pci_bus_region pci_64_bit = {0,
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(pci_bus_addr_t) 0xffffffffffffffffULL};
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static struct pci_bus_region pci_high = {(pci_bus_addr_t) 0x100000000ULL,
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(pci_bus_addr_t) 0xffffffffffffffffULL};
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#endif
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/*
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* @res contains CPU addresses. Clip it so the corresponding bus addresses
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* on @bus are entirely within @region. This is used to control the bus
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* addresses of resources we allocate, e.g., we may need a resource that
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* can be mapped by a 32-bit BAR.
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*/
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static void pci_clip_resource_to_region(struct pci_bus *bus,
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struct resource *res,
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struct pci_bus_region *region)
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{
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struct pci_bus_region r;
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pcibios_resource_to_bus(bus, &r, res);
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if (r.start < region->start)
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r.start = region->start;
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if (r.end > region->end)
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r.end = region->end;
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if (r.end < r.start)
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res->end = res->start - 1;
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else
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pcibios_bus_to_resource(bus, res, &r);
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}
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static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
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resource_size_t size, resource_size_t align,
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resource_size_t min, unsigned long type_mask,
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resource_size_t (*alignf)(void *,
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const struct resource *,
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resource_size_t,
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resource_size_t),
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void *alignf_data,
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struct pci_bus_region *region)
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{
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int i, ret;
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struct resource *r, avail;
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resource_size_t max;
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type_mask |= IORESOURCE_TYPE_BITS;
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pci_bus_for_each_resource(bus, r, i) {
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if (!r)
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continue;
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/* type_mask must match */
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if ((res->flags ^ r->flags) & type_mask)
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continue;
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/* We cannot allocate a non-prefetching resource
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from a pre-fetching area */
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if ((r->flags & IORESOURCE_PREFETCH) &&
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!(res->flags & IORESOURCE_PREFETCH))
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continue;
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avail = *r;
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pci_clip_resource_to_region(bus, &avail, region);
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/*
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* "min" is typically PCIBIOS_MIN_IO or PCIBIOS_MIN_MEM to
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* protect badly documented motherboard resources, but if
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* this is an already-configured bridge window, its start
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* overrides "min".
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*/
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if (avail.start)
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min = avail.start;
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max = avail.end;
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/* Ok, try it out.. */
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ret = allocate_resource(r, res, size, min, max,
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align, alignf, alignf_data);
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if (ret == 0)
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return 0;
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}
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return -ENOMEM;
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}
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/**
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* pci_bus_alloc_resource - allocate a resource from a parent bus
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* @bus: PCI bus
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* @res: resource to allocate
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* @size: size of resource to allocate
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* @align: alignment of resource to allocate
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* @min: minimum /proc/iomem address to allocate
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* @type_mask: IORESOURCE_* type flags
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* @alignf: resource alignment function
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* @alignf_data: data argument for resource alignment function
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*
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* Given the PCI bus a device resides on, the size, minimum address,
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* alignment and type, try to find an acceptable resource allocation
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* for a specific device resource.
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*/
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int pci_bus_alloc_resource(struct pci_bus *bus, struct resource *res,
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resource_size_t size, resource_size_t align,
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resource_size_t min, unsigned long type_mask,
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resource_size_t (*alignf)(void *,
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const struct resource *,
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resource_size_t,
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resource_size_t),
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void *alignf_data)
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{
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#ifdef CONFIG_PCI_BUS_ADDR_T_64BIT
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int rc;
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if (res->flags & IORESOURCE_MEM_64) {
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rc = pci_bus_alloc_from_region(bus, res, size, align, min,
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type_mask, alignf, alignf_data,
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&pci_high);
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if (rc == 0)
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return 0;
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return pci_bus_alloc_from_region(bus, res, size, align, min,
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type_mask, alignf, alignf_data,
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&pci_64_bit);
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}
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#endif
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return pci_bus_alloc_from_region(bus, res, size, align, min,
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type_mask, alignf, alignf_data,
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&pci_32_bit);
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}
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EXPORT_SYMBOL(pci_bus_alloc_resource);
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/*
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* The @idx resource of @dev should be a PCI-PCI bridge window. If this
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* resource fits inside a window of an upstream bridge, do nothing. If it
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* overlaps an upstream window but extends outside it, clip the resource so
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* it fits completely inside.
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*/
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bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
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{
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struct pci_bus *bus = dev->bus;
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struct resource *res = &dev->resource[idx];
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struct resource orig_res = *res;
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struct resource *r;
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int i;
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pci_bus_for_each_resource(bus, r, i) {
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resource_size_t start, end;
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if (!r)
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continue;
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if (resource_type(res) != resource_type(r))
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continue;
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start = max(r->start, res->start);
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end = min(r->end, res->end);
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if (start > end)
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continue; /* no overlap */
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if (res->start == start && res->end == end)
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return false; /* no change */
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res->start = start;
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res->end = end;
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res->flags &= ~IORESOURCE_UNSET;
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orig_res.flags &= ~IORESOURCE_UNSET;
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dev_printk(KERN_DEBUG, &dev->dev, "%pR clipped to %pR\n",
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&orig_res, res);
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return true;
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}
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return false;
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}
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void __weak pcibios_resource_survey_bus(struct pci_bus *bus) { }
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/**
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* pci_bus_add_device - start driver for a single device
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* @dev: device to add
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*
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* This adds add sysfs entries and start device drivers
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*/
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void pci_bus_add_device(struct pci_dev *dev)
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{
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int retval;
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/*
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* Can not put in pci_device_add yet because resources
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* are not assigned yet for some devices.
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*/
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pci_fixup_device(pci_fixup_final, dev);
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pci_create_sysfs_dev_files(dev);
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pci_proc_attach_device(dev);
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dev->match_driver = true;
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retval = device_attach(&dev->dev);
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WARN_ON(retval < 0);
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dev->is_added = 1;
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}
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EXPORT_SYMBOL_GPL(pci_bus_add_device);
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/**
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* pci_bus_add_devices - start driver for PCI devices
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* @bus: bus to check for new devices
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*
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* Start driver for PCI devices and add some sysfs entries.
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*/
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void pci_bus_add_devices(const struct pci_bus *bus)
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{
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struct pci_dev *dev;
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struct pci_bus *child;
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list_for_each_entry(dev, &bus->devices, bus_list) {
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/* Skip already-added devices */
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if (dev->is_added)
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continue;
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pci_bus_add_device(dev);
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}
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list_for_each_entry(dev, &bus->devices, bus_list) {
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BUG_ON(!dev->is_added);
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child = dev->subordinate;
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if (child)
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pci_bus_add_devices(child);
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}
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}
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EXPORT_SYMBOL(pci_bus_add_devices);
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/** pci_walk_bus - walk devices on/under bus, calling callback.
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* @top bus whose devices should be walked
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* @cb callback to be called for each device found
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* @userdata arbitrary pointer to be passed to callback.
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*
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* Walk the given bus, including any bridged devices
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* on buses under this bus. Call the provided callback
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* on each device found.
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*
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* We check the return of @cb each time. If it returns anything
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* other than 0, we break out.
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*
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*/
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void pci_walk_bus(struct pci_bus *top, int (*cb)(struct pci_dev *, void *),
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void *userdata)
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{
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struct pci_dev *dev;
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struct pci_bus *bus;
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struct list_head *next;
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int retval;
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bus = top;
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down_read(&pci_bus_sem);
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next = top->devices.next;
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for (;;) {
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if (next == &bus->devices) {
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/* end of this bus, go up or finish */
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if (bus == top)
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break;
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next = bus->self->bus_list.next;
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bus = bus->self->bus;
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continue;
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}
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dev = list_entry(next, struct pci_dev, bus_list);
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if (dev->subordinate) {
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/* this is a pci-pci bridge, do its devices next */
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next = dev->subordinate->devices.next;
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bus = dev->subordinate;
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} else
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next = dev->bus_list.next;
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retval = cb(dev, userdata);
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if (retval)
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break;
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}
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up_read(&pci_bus_sem);
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}
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EXPORT_SYMBOL_GPL(pci_walk_bus);
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struct pci_bus *pci_bus_get(struct pci_bus *bus)
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{
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if (bus)
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get_device(&bus->dev);
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return bus;
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}
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EXPORT_SYMBOL(pci_bus_get);
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void pci_bus_put(struct pci_bus *bus)
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{
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if (bus)
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put_device(&bus->dev);
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}
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EXPORT_SYMBOL(pci_bus_put);
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