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| author | Bjorn Helgaas <bhelgaas@google.com> | 2012-07-10 05:02:44 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2012-07-10 05:02:44 +0200 |
| commit | d68e70c6e59ad08feca291c2790164d3231c425e (patch) | |
| tree | 17bd7b95ef577a5b2f1913be20e31c0f41390d1a /drivers/pci | |
| parent | Merge branch 'pci/myron-final-fixups-v2' into next (diff) | |
| parent | PCI: disable MEM decoding while updating 64-bit MEM BARs (diff) | |
| download | linux-d68e70c6e59ad08feca291c2790164d3231c425e.tar.xz linux-d68e70c6e59ad08feca291c2790164d3231c425e.zip | |
Merge branch 'pci/bjorn-disable-decode' into next
* pci/bjorn-disable-decode:
PCI: disable MEM decoding while updating 64-bit MEM BARs
PCI: leave MEM and IO decoding disabled during 64-bit BAR sizing, too
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/probe.c | 6 | ||||
| -rw-r--r-- | drivers/pci/setup-res.c | 18 |
2 files changed, 21 insertions, 3 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index cd06c8478267..5e5358a3dd92 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -189,9 +189,6 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, pci_read_config_dword(dev, pos, &sz); pci_write_config_dword(dev, pos, l); - if (!dev->mmio_always_on) - pci_write_config_word(dev, PCI_COMMAND, orig_cmd); - /* * All bits set in sz means the device isn't working properly. * If the BAR isn't implemented, all bits must be 0. If it's a @@ -276,6 +273,9 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type, } out: + if (!dev->mmio_always_on) + pci_write_config_word(dev, PCI_COMMAND, orig_cmd); + return (res->flags & IORESOURCE_MEM_64) ? 1 : 0; fail: res->flags = 0; diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c index eea85dafc763..1a0e60e265ea 100644 --- a/drivers/pci/setup-res.c +++ b/drivers/pci/setup-res.c @@ -30,6 +30,8 @@ void pci_update_resource(struct pci_dev *dev, int resno) { struct pci_bus_region region; + bool disable; + u16 cmd; u32 new, check, mask; int reg; enum pci_bar_type type; @@ -67,6 +69,18 @@ void pci_update_resource(struct pci_dev *dev, int resno) new |= PCI_ROM_ADDRESS_ENABLE; } + /* + * We can't update a 64-bit BAR atomically, so when possible, + * disable decoding so that a half-updated BAR won't conflict + * with another device. + */ + disable = (res->flags & IORESOURCE_MEM_64) && !dev->mmio_always_on; + if (disable) { + pci_read_config_word(dev, PCI_COMMAND, &cmd); + pci_write_config_word(dev, PCI_COMMAND, + cmd & ~PCI_COMMAND_MEMORY); + } + pci_write_config_dword(dev, reg, new); pci_read_config_dword(dev, reg, &check); @@ -84,6 +98,10 @@ void pci_update_resource(struct pci_dev *dev, int resno) "(high %#08x != %#08x)\n", resno, new, check); } } + + if (disable) + pci_write_config_word(dev, PCI_COMMAND, cmd); + res->flags &= ~IORESOURCE_UNSET; dev_dbg(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n", resno, res, (unsigned long long)region.start, |