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authorBjorn Helgaas2016-03-01 11:38:46 -0600
committerBjorn Helgaas2016-03-08 12:14:31 -0600
commit0c0e0736acad4e76e718456c75d78ad95eea0011 (patch)
treeb2eb794d8d74db049e47449228d8621a9e0db91f /include
parent4708f9a55b31062dd19b12788ecf614aa4e79bea (diff)
PCI: Set ROM shadow location in arch code, not in PCI core
IORESOURCE_ROM_SHADOW means there is a copy of a device's option ROM in RAM. The existence of such a copy and its location are arch-specific. Previously the IORESOURCE_ROM_SHADOW flag was set in arch code, but the 0xC0000-0xDFFFF location was hard-coded into the PCI core. If we're using a shadow copy in RAM, disable the ROM BAR and release the address space it was consuming. Move the location information from the PCI core to the arch code that sets IORESOURCE_ROM_SHADOW. Save the location of the RAM copy in the struct resource for PCI_ROM_RESOURCE. After this change, pci_map_rom() will call pci_assign_resource() and pci_enable_rom() for these IORESOURCE_ROM_SHADOW resources, which we did not do before. This is safe because: - pci_assign_resource() will do nothing because the resource is marked IORESOURCE_PCI_FIXED, which means we can't move it, and - pci_enable_rom() will not turn on the ROM BAR's enable bit because the resource is marked IORESOURCE_ROM_SHADOW, which means it is in RAM rather than in PCI memory space. Storing the location in the struct resource means "lspci" will show the shadow location, not the value from the ROM BAR. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'include')
-rw-r--r--include/linux/ioport.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/ioport.h b/include/linux/ioport.h
index 24bea087e7af..2cf16673f17a 100644
--- a/include/linux/ioport.h
+++ b/include/linux/ioport.h
@@ -98,7 +98,7 @@ struct resource {
/* PCI ROM control bits (IORESOURCE_BITS) */
#define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
-#define IORESOURCE_ROM_SHADOW (1<<1) /* ROM is copy at C000:0 */
+#define IORESOURCE_ROM_SHADOW (1<<1) /* Use RAM image, not ROM BAR */
#define IORESOURCE_ROM_COPY (1<<2) /* ROM is alloc'd copy, resource field overlaid */
#define IORESOURCE_ROM_BIOS_COPY (1<<3) /* ROM is BIOS copy, resource field overlaid */