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| author | Bjorn Helgaas <bjorn.helgaas@hp.com> | 2010-07-15 09:41:42 -0600 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-07-16 11:39:48 -0700 |
| commit | 58c84eda07560a6b75b03e8d3b26d6eddfc14011 (patch) | |
| tree | 0104345d24d5fb79842ffd563ea69fdf2906931d /include | |
| parent | 2f7989efd4398d92b8adffce2e07dd043a0895fe (diff) | |
| download | op-kernel-dev-58c84eda07560a6b75b03e8d3b26d6eddfc14011.zip op-kernel-dev-58c84eda07560a6b75b03e8d3b26d6eddfc14011.tar.gz | |
PCI: fall back to original BIOS BAR addresses
If we fail to assign resources to a PCI BAR, this patch makes us try the
original address from BIOS rather than leaving it disabled.
Linux tries to make sure all PCI device BARs are inside the upstream
PCI host bridge or P2P bridge apertures, reassigning BARs if necessary.
Windows does similar reassignment.
Before this patch, if we could not move a BAR into an aperture, we left
the resource unassigned, i.e., at address zero. Windows leaves such BARs
at the original BIOS addresses, and this patch makes Linux do the same.
This is a bit ugly because we disable the resource long before we try to
reassign it, so we have to keep track of the BIOS BAR address somewhere.
For lack of a better place, I put it in the struct pci_dev.
I think it would be cleaner to attempt the assignment immediately when the
claim fails, so we could easily remember the original address. But we
currently claim motherboard resources in the middle, after attempting to
claim PCI resources and before assigning new PCI resources, and changing
that is a fairly big job.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16263
Reported-by: Andrew <nitr0@seti.kr.ua>
Tested-by: Andrew <nitr0@seti.kr.ua>
Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 7cb0084..f26fda7 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -288,6 +288,7 @@ struct pci_dev { */ unsigned int irq; struct resource resource[DEVICE_COUNT_RESOURCE]; /* I/O and memory regions + expansion ROMs */ + resource_size_t fw_addr[DEVICE_COUNT_RESOURCE]; /* FW-assigned addr */ /* These fields are used by common fixups */ unsigned int transparent:1; /* Transparent PCI bridge */ |
