PCI: Disable IO/MEM decoding for devices with non-compliant BARs

commit b84106b4e2290c081cdab521fa832596cdfea246 upstream.

The PCI config header (first 64 bytes of each device's config space) is
defined by the PCI spec so generic software can identify the device and
manage its usage of I/O, memory, and IRQ resources.

Some non-spec-compliant devices put registers other than BARs where the
BARs should be.  When the PCI core sizes these "BARs", the reads and writes
it does may have unwanted side effects, and the "BAR" may appear to
describe non-sensical address space.

Add a flag bit to mark non-compliant devices so we don't touch their BARs.
Turn off IO/MEM decoding to prevent the devices from consuming address
space, since we can't read the BARs to find out what that address space
would be.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index edb1984201e9702162321c50f33f76ba362bac5a..7aafb5fb9336e2a657ee0aa19dac54957b0f42da 100644 (file)
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -179,6 +179,9 @@ int __pci_read_base(struct pci_dev *dev, enum pci_bar_type type,
        u16 orig_cmd;
        struct pci_bus_region region, inverted_region;
 
+       if (dev->non_compliant_bars)
+               return 0;
+
        mask = type ? PCI_ROM_ADDRESS_MASK : ~0;
 
        /* No printks while decoding is disabled! */
@@ -1174,6 +1177,7 @@ void pci_msi_setup_pci_dev(struct pci_dev *dev)
 int pci_setup_device(struct pci_dev *dev)
 {
        u32 class;
+       u16 cmd;
        u8 hdr_type;
        int pos = 0;
        struct pci_bus_region region;
@@ -1219,6 +1223,16 @@ int pci_setup_device(struct pci_dev *dev)
        /* device class may be changed after fixup */
        class = dev->class >> 8;
 
+       if (dev->non_compliant_bars) {
+               pci_read_config_word(dev, PCI_COMMAND, &cmd);
+               if (cmd & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
+                       dev_info(&dev->dev, "device has non-compliant BARs; disabling IO/MEM decoding\n");
+                       cmd &= ~PCI_COMMAND_IO;
+                       cmd &= ~PCI_COMMAND_MEMORY;
+                       pci_write_config_word(dev, PCI_COMMAND, cmd);
+               }
+       }
+
        switch (dev->hdr_type) {                    /* header type */
        case PCI_HEADER_TYPE_NORMAL:                /* standard header */
                if (class == PCI_CLASS_BRIDGE_PCI)

diff --git a/include/linux/pci.h b/include/linux/pci.h
index 6ae25aae88fd1254f40227341ca20b73a2e08ce2..4e554bfff1295b59e80648bf8a018aa7284bf7b9 100644 (file)
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -359,6 +359,7 @@ struct pci_dev {
        unsigned int    io_window_1k:1; /* Intel P2P bridge 1K I/O windows */
        unsigned int    irq_managed:1;
        unsigned int    has_secondary_link:1;
+       unsigned int    non_compliant_bars:1;   /* broken BARs; ignore them */
        pci_dev_flags_t dev_flags;
        atomic_t        enable_cnt;     /* pci_enable_device has been called */