This is basically v7 of Yinghai's patch series: http://lkml.kernel.org/r/1387485843-17403-1-git-send-email-yinghai@xxxxxxxxxx The goal is to try to put 64-bit BARs above 4G so we can preserve the 32-bit bus address space for 32-bit BARs. There are a whole bunch of AGP updates at the beginning because some AGP devices have 64-bit BARs, but most of the AGP drivers read the aperture bus address directly from the BAR, and they only handle 32-bit BARs. Putting BARs above 4G would break those drivers, so we tried to fix them up first. Yinghai fixed intel-gtt.c, and I made similar fixes to all the other AGP drivers I could find. Some of the AGP updates are related to the fact that most of the drivers assume the PCI bus address is the same as the CPU physical address. For example, they read the bus address from the BAR, then call ioremap() on it. This is wrong, because ioremap() expects a CPU physical address, not a bus address. In most cases, I think AGP devices are in simple systems where (bus_address == CPU_physical_address), so these updates probably don't fix any broken systems. I'm pretty sure there are more things like this that should be fixed. The important PCI changes are the last two: PCI: Enforce bus address limits in resource allocation PCI: Allocate 64-bit BARs above 4G when possible The first fixes a long-standing bug: we would never assign space to a 32-bit BAR if the *CPU* address didn't fit in 32 bits. But the important thing is the *bus* address, and that may fit in 32 bits even if the CPU address doesn't. The second is the one that tries to allocate space above 4G for 64-bit BARs. If that fails, we fall back to allocating space anywhere. It's possible this will expose other broken drivers that can't deal with 64-bit BARs being above 4G. I kept Yinghai as the author of the patches that originated with him, but I reworked them substantially to try to simplify the series, so any bugs here are most likely my fault. If my rework made things worse, or if it makes your life difficult, I will consider doing something different; just let me know. --- Bjorn Helgaas (11): PCI: Change pci_bus_region addresses to dma_addr_t PCI: Add pci_bus_address() to get bus address of a BAR agp: Support 64-bit APBASE agp: Use pci_resource_start() to get CPU physical address for BAR drm/i915: Rename gtt_bus_addr to gtt_phys_addr agp/intel: Rename gtt_bus_addr to gtt_phys_addr agp/intel: Use pci_bus_address() to get MMADR bus address agp/intel: Use pci_bus_address() to get GTTADR bus address agp/intel: Use CPU physical address, not bus address, for ioremap() agp/ati: Use PCI_COMMAND instead of hard-coded 4 PCI: Split out bridge window override of minimum allocation address Yinghai Lu (4): PCI: Convert pcibios_resource_to_bus() to take a pci_bus, not a pci_dev agp/intel: Support 64-bit GMADR PCI: Enforce bus address limits in resource allocation PCI: Allocate 64-bit BARs above 4G when possible arch/alpha/kernel/pci-sysfs.c | 4 + arch/powerpc/kernel/pci-common.c | 4 + arch/powerpc/kernel/pci_of_scan.c | 4 + arch/sparc/kernel/pci.c | 6 +- arch/x86/include/asm/pci.h | 1 drivers/char/agp/agp.h | 1 drivers/char/agp/ali-agp.c | 4 + drivers/char/agp/amd-k7-agp.c | 14 ++-- drivers/char/agp/amd64-agp.c | 5 - drivers/char/agp/ati-agp.c | 21 +++--- drivers/char/agp/efficeon-agp.c | 5 + drivers/char/agp/generic.c | 4 + drivers/char/agp/intel-agp.c | 48 +++++-------- drivers/char/agp/intel-agp.h | 10 +-- drivers/char/agp/intel-gtt.c | 47 +++++-------- drivers/char/agp/nvidia-agp.c | 9 +- drivers/char/agp/sis-agp.c | 5 + drivers/char/agp/via-agp.c | 13 ++-- drivers/gpu/drm/i915/i915_gem_gtt.c | 6 +- drivers/pci/bus.c | 128 +++++++++++++++++++++++++++-------- drivers/pci/host-bridge.c | 19 ++--- drivers/pci/probe.c | 18 ++--- drivers/pci/quirks.c | 2 - drivers/pci/rom.c | 2 - drivers/pci/setup-bus.c | 16 ++-- drivers/pci/setup-res.c | 2 - drivers/pcmcia/i82092.c | 2 - drivers/pcmcia/yenta_socket.c | 6 +- drivers/scsi/sym53c8xx_2/sym_glue.c | 5 + drivers/video/arkfb.c | 2 - drivers/video/s3fb.c | 2 - drivers/video/vt8623fb.c | 2 - include/linux/pci.h | 20 +++-- 33 files changed, 241 insertions(+), 196 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
