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c1f343028d
linux/arch/powerpc/kernel
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Benjamin Herrenschmidt c1f343028d powerpc/pci: Reserve legacy regions on PCI 
There's a problem on some embedded platforms when we re-assign
everything on PCI, such as 44x. The generic code tries to avoid
assigning devices to addresses overlapping the low legacy
addresses such as VGA hard decoded areas using constants that
are unfortunately no good for us, as they don't take into account
the address translation we do to access PCI busses.

Thus we end up allocating things like IO BARs to 0, which is
technically legal, but will shadow hard decoded ports for use
by things like VGA cards.

This works around it by attempting to reserve legacy regions
before we try to assign addresses.

NOTE: This may have nasty side effects in cases I haven't tested
yet:

 - We try to use FW mappings (ie. powermac) and the FW has allocated
a conflicting address over those legacy regions. This will typically
happen. I would expect the new code to just fail with an informative
message without harm but I haven't had a chance to test that scenario
yet.

 - A device with fixed BARs overlapping those legacy addresses such
as an IDE controller in legacy mode is in the system. I don't know
for sure yet what will happen there, I have to test :-)

Ideally, we should change PCIBIOS_MIN_IO/MIN_MEM accross the board
to take a bus pointer so they can provide appropriate per-bus translated
values to the generic code but that's a more invasive patch. I will
do that in the future, but in the meantime, this fixes the problem
locally

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2009-01-08 16:25:07 +11:00
..
vdso32 powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
vdso64 powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
.gitignore
align.c
asm-offsets.c KVM: ppc: Implement in-kernel exit timing statistics 2008-12-31 16:55:41 +02:00
audit.c
btext.c
clock.c
compat_audit.c
cpu_setup_6xx.S
cpu_setup_44x.S powerpc/virtex5: Fix Virtex5 machine check handling 2008-12-05 14:34:26 -05:00
cpu_setup_pa6t.S
cpu_setup_ppc970.S
cputable.c powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
crash_dump.c powerpc: Support for relocatable kdump kernel 2008-10-22 15:01:22 +11:00
crash.c
dma-iommu.c powerpc: Update remaining dma_mapping_ops to use map/unmap_page 2008-10-31 16:13:48 +11:00
dma.c powerpc: Add sync_*_for_* to dma_ops 2008-12-03 20:46:36 +11:00
entry_32.S powerpc: ftrace, do nothing in mcount call for dyn ftrace 2008-11-28 14:07:45 +01:00
entry_64.S Merge commit 'v2.6.28-rc7' into tracing/core 2008-12-04 09:07:19 +01:00
firmware.c
fpu.S
ftrace.c powerpc: ftrace, use create_branch 2008-11-28 14:08:01 +01:00
head_8xx.S
head_32.S powerpc/32: Add the ability for a classic ppc kernel to be loaded at 32M 2008-12-23 15:13:29 +11:00
head_40x.S
head_44x.S powerpc/44x: Support 16K/64K base page sizes on 44x 2008-12-29 09:53:25 +11:00
head_64.S powerpc/ppc64/kdump: Better flag for running relocatable 2008-10-31 16:11:49 +11:00
head_booke.h
head_fsl_booke.S powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
ibmebus.c powerpc: struct device - replace bus_id with dev_name(), dev_set_name() 2008-12-16 15:53:38 +11:00
idle_6xx.S
idle_e500.S
idle_power4.S
idle.c powerpc: ftrace, do not latency trace idle 2008-11-20 10:51:15 -08:00
init_task.c take init_fs to saner place 2008-12-31 18:07:42 -05:00
io.c
iomap.c
iommu.c powerpc: Update remaining dma_mapping_ops to use map/unmap_page 2008-10-31 16:13:48 +11:00
irq.c cpumask: make irq_set_affinity() take a const struct cpumask 2008-12-13 21:20:26 +10:30
isa-bridge.c
kgdb.c
kprobes.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-01-07 11:31:52 -08:00
l2cr_6xx.S
legacy_serial.c
lparcfg.c
machine_kexec_32.c
machine_kexec_64.c powerpc/32: Setup OF properties for kdump 2008-12-23 15:13:29 +11:00
machine_kexec.c powerpc/32: Setup OF properties for kdump 2008-12-23 15:13:29 +11:00
Makefile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
misc_32.S powerpc/44x: Support 16K/64K base page sizes on 44x 2008-12-29 09:53:25 +11:00
misc_64.S powerpc: Kexec exit should not use magic numbers 2008-10-31 16:11:44 +11:00
misc.S
module_32.c powerpc/ppc32: ftrace, dynamic ftrace to handle modules 2008-11-20 10:52:53 -08:00
module_64.c powerpc/ppc64: ftrace, handle module trampolines for dyn ftrace 2008-11-20 10:52:28 -08:00
module.c powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
msi.c
nvram_64.c
of_device.c powerpc: struct device - replace bus_id with dev_name(), dev_set_name() 2008-12-16 15:53:38 +11:00
of_platform.c
paca.c powerpc: Update page-in counter for CMM 2008-11-05 22:08:28 +11:00
pci_32.c powerpc: Remove `have_of' global variable 2008-12-16 15:52:57 +11:00
pci_64.c powerpc/pci: Split pcibios_fixup_bus() into bus setup and device setup 2008-11-06 09:22:37 +11:00
pci_dn.c
pci-common.c powerpc/pci: Reserve legacy regions on PCI 2009-01-08 16:25:07 +11:00
pmc.c
ppc32.h
ppc_ksyms.c powerpc/mm: Add SMP support to no-hash TLB handling 2008-12-21 14:21:16 +11:00
ppc_save_regs.S powerpc: Prepare xmon_save_regs for use with kdump 2008-12-23 15:13:28 +11:00
proc_ppc64.c
process.c [PATCH] idle cputime accounting 2008-12-31 15:11:46 +01:00
prom_init_check.sh powerpc: Fix build issue with CONFIG_RELOCATABLE=y 2008-10-21 15:17:49 +11:00
prom_init.c Revert "powerpc: Sync RPA note in zImage with kernel's RPA note" 2008-10-31 22:36:21 +11:00
prom_parse.c PCI: powerpc: use generic pci_swizzle_interrupt_pin() 2009-01-07 11:12:52 -08:00
prom.c powerpc: Force memory size to be a multiple of PAGE_SIZE 2008-12-29 09:53:14 +11:00
ptrace32.c
ptrace.c
reloc_64.S
rtas_flash.c
rtas_pci.c powerpc/pci: Fix various pseries PCI hotplug issues 2008-11-06 09:31:52 +11:00
rtas-proc.c
rtas-rtc.c
rtas.c powerpc/pseries: Check for GIQ indicator before calling set-indicator 2008-12-16 15:53:13 +11:00
setup_32.c powerpc/32: Wire up the trampoline code for kdump 2008-12-23 15:13:29 +11:00
setup_64.c powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
setup-common.c powerpc: Move memory size print into common show_cpuinfo for 32-bit 2008-10-22 11:00:25 +11:00
setup.h
signal_32.c powerpc: Fix msr check in compat_sys_swapcontext 2008-11-11 19:42:22 +11:00
signal_64.c powerpc: Fix swapcontext system for VSX + old ucontext size 2008-10-31 16:12:00 +11:00
signal.c
signal.h x86, um: get rid of uml signal.h 2008-10-22 22:55:20 -07:00
smp-tbsync.c powerpc: Silence software timebase sync 2008-11-05 22:08:28 +11:00
smp.c Merge branch 'cpus4096-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-01-02 11:44:09 -08:00
softemu8xx.c
stacktrace.c
suspend.c
swsusp_32.S powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00
swsusp_64.c
swsusp_asm64.S
swsusp.c powerpc/mm: Split mmu_context handling 2008-12-21 14:21:15 +11:00
sys_ppc32.c
syscalls.c
sysfs.c powerpc: Convert sysfs cache code to of_find_next_cache_node() 2008-12-21 14:21:14 +11:00
systbl_chk.c
systbl_chk.sh
systbl.S
tau_6xx.c
time.c Merge branch 'cputime' of git://git390.osdl.marist.edu/pub/scm/linux-2.6 2009-01-03 11:56:24 -08:00
traps.c powerpc: Add SPE/EFP math emulation for E500v1/v2 processors. 2008-12-03 08:19:16 -06:00
udbg_16550.c powerpc: Unsigned speed cannot be negative in udbg_16559.c 2008-10-21 15:17:47 +11:00
udbg.c
vdso.c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc 2008-12-28 16:54:33 -08:00
vecemu.c
vector.S
vio.c powerpc: struct device - replace bus_id with dev_name(), dev_set_name() 2008-12-16 15:53:38 +11:00
vmlinux.lds.S powerpc/mm: Introduce MMU features 2008-12-21 14:21:16 +11:00