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pci-v7.0-fixes-1

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Merge tag 'pci-v7.0-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull pci fixes from Bjorn Helgaas:

 - Fix bridge window selection bug that prevented resource assignment
   (Kai-Heng Feng)

 - Fix bridge window sizing, which failed to assign resources for
   windows containing only optional resources (ROMs, SR-IOV BARs, etc)
   (Ilpo Järvinen)

 - Select CONFIGFS_FS when PCI_EPF_TEST is enabled to avoid a link error
   (Arnd Bergmann)

 - Fix recently merged Endpoint inbound submapping feature (Koichiro
   Den)

* tag 'pci-v7.0-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  PCI: dwc: ep: Always clear IB maps on BAR update
  PCI: dwc: ep: Return after clearing BAR-match inbound mapping
  PCI: endpoint: pci-epf-test: Select configfs
  PCI: Account fully optional bridge windows correctly
  PCI: Validate window resource type in pbus_select_window_for_type()
This commit is contained in:
Linus Torvalds 2026-02-20 17:05:52 -08:00
commit 3f6eb5a6d2
3 changed files with 40 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

15
drivers/pci/controller/dwc/pcie-designware-ep.c
View file

@ -165,6 +165,7 @@ static void dw_pcie_ep_clear_ib_maps(struct dw_pcie_ep *ep, u8 func_no, enum pci
dw_pcie_disable_atu(pci, PCIE_ATU_REGION_DIR_IB, atu_index);
clear_bit(atu_index, ep->ib_window_map);
ep_func->bar_to_atu[bar] = 0;
return;
}
/* Tear down all Address Match Mode mappings, if any. */
@ -518,6 +519,12 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
/*
* We can only dynamically change a BAR if the new BAR size and
* BAR flags do not differ from the existing configuration.
*
* Note: this safety check only works when the caller uses
* a new struct pci_epf_bar in the second set_bar() call.
* If the same instance is updated in place and passed in,
* we cannot reliably detect invalid barno/size/flags
* changes here.
*/
if (ep_func->epf_bar[bar]->barno != bar ||
ep_func->epf_bar[bar]->size != size ||
@ -526,10 +533,12 @@ static int dw_pcie_ep_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
/*
* When dynamically changing a BAR, tear down any existing
* mappings before re-programming.
* mappings before re-programming. This is redundant when
* both the old and new mappings are BAR Match Mode, but
* required to handle in-place updates and match-mode
* changes reliably.
*/
if (ep_func->epf_bar[bar]->num_submap || epf_bar->num_submap)
dw_pcie_ep_clear_ib_maps(ep, func_no, bar);
dw_pcie_ep_clear_ib_maps(ep, func_no, bar);
/*
* When dynamically changing a BAR, skip writing the BAR reg, as

1
drivers/pci/endpoint/functions/Kconfig
View file

@ -6,6 +6,7 @@
config PCI_EPF_TEST
tristate "PCI Endpoint Test driver"
depends on PCI_ENDPOINT
select CONFIGFS_FS
select CRC32
help
Enable this configuration option to enable the test driver

44
drivers/pci/setup-bus.c
View file

@ -224,14 +224,21 @@ static struct resource *pbus_select_window_for_type(struct pci_bus *bus,
switch (iores_type) {
case IORESOURCE_IO:
return pci_bus_resource_n(bus, PCI_BUS_BRIDGE_IO_WINDOW);
win = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_IO_WINDOW);
if (win && (win->flags & IORESOURCE_IO))
return win;
return NULL;
case IORESOURCE_MEM:
mmio = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_MEM_WINDOW);
mmio_pref = pci_bus_resource_n(bus, PCI_BUS_BRIDGE_PREF_MEM_WINDOW);
if (!(type & IORESOURCE_PREFETCH) ||
!(mmio_pref->flags & IORESOURCE_MEM))
if (mmio && !(mmio->flags & IORESOURCE_MEM))
mmio = NULL;
if (mmio_pref && !(mmio_pref->flags & IORESOURCE_MEM))
mmio_pref = NULL;
if (!(type & IORESOURCE_PREFETCH) || !mmio_pref)
return mmio;
if ((type & IORESOURCE_MEM_64) ||
@ -1217,31 +1224,34 @@ static bool pbus_size_mem_optional(struct pci_dev *dev, int resno,
struct resource *res = pci_resource_n(dev, resno);
bool optional = pci_resource_is_optional(dev, resno);
resource_size_t r_size = resource_size(res);
struct pci_dev_resource *dev_res;
struct pci_dev_resource *dev_res = NULL;
if (!realloc_head)
return false;
if (!optional) {
/*
* Only bridges have optional sizes in realloc_head at this
* point. As res_to_dev_res() walks the entire realloc_head
* list, skip calling it when known unnecessary.
*/
if (!pci_resource_is_bridge_win(resno))
return false;
/*
* Only bridges have optional sizes in realloc_head at this
* point. As res_to_dev_res() walks the entire realloc_head
* list, skip calling it when known unnecessary.
*/
if (pci_resource_is_bridge_win(resno)) {
dev_res = res_to_dev_res(realloc_head, res);
if (dev_res) {
*children_add_size += dev_res->add_size;
*add_align = max(*add_align, dev_res->min_align);
}
return false;
}
/* Put SRIOV requested res to the optional list */
pci_dev_res_add_to_list(realloc_head, dev, res, 0, align);
if (!optional)
return false;
/*
* Put requested res to the optional list if not there yet (SR-IOV,
* disabled ROM). Bridge windows with an optional part are already
* on the list.
*/
if (!dev_res)
pci_dev_res_add_to_list(realloc_head, dev, res, 0, align);
*children_add_size += r_size;
*add_align = max(align, *add_align);