Date: Sun, 22 May 2011 20:04:22 +0200 From: Olivier Houchard <mlfbsd@ci0.org> To: Damjan Marion <damjan.marion@gmail.com> Cc: freebsd-hackers@freebsd.org, freebsd-arm@freebsd.org Subject: Re: vm_fault when accessing PCI address space Message-ID: <20110522180422.GA46973@ci0.org> In-Reply-To: <D209676D-CDA8-4490-8965-86488C41D404@gmail.com> References: <D209676D-CDA8-4490-8965-86488C41D404@gmail.com>
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On Sat, May 21, 2011 at 01:34:02AM +0200, Damjan Marion wrote: > > Hi, > Hi Damjan, > I'm made some progress on porting existing marvell orion ARM code > to work on 88F5181L SoC which have embedded PCI controller. > > PCI driver detects resources and recognizes Atheros wlan card, > however when driver tries to access 1st register with > bus_space_write_4 vm_fault happens: > > vm_fault(0xc0e4f000, e8007000, 2, 0) -> 1 > Fatal kernel mode data abort: 'Translation Fault (S)' > trapframe: 0xc0d3faa4 > FSR=00000005, FAR=e800704c, spsr=600000d3 > r0 =00000000, r1 =e8000000, r2 =0000704c, r3 =00000003 > r4 =c13cd000, r5 =c0c4bd60, r6 =c0bece04, r7 =c12dd000 > r8 =00000023, r9 =c0d074c8, r10=c0d3fba4, r11=c0d3fb00 > r12=00000000, ssp=c0d3faf0, slr=c095f830, pc =c0bece04 > > [ thread pid 0 tid 100000 ] > Stopped at generic_bs_w_4: str r3, [r1, r2] > > 0xe8000000 is PCI mem space. I can see that PCI driver (mv_pci.c) allocates this resource: > > pcib0: <Marvell Integrated PCI/PCI-E Controller> mem 0xf1030000-0xf1031fff irq 0 on fdtbus0 > pci0: <PCI bus> on pcib0 > mv_pcib_alloc_resource: start=0xe8000000 end=0xe800ffff count=0x00010000 flags=0x00 > > What can be the reason for this vm_fault? > I don't know the Marvell, nor the FDT code, well, but you shouldn't access to the PCI mem space using the physical address, so maybe something is missing from the dts ? Also, reading the mv code, there's this in mv_machdep.c : if (fdt_pci_devmap(child, &fdt_devmap[i], MV_PCIE_IO_BASE, MV_PCIE_MEM_BASE) != 0) return (ENXIO); but nothing equivalent for the PCI controller (as it seems the Orion has both PCI and PCIe). So maybe it is lacking ? Regards, Olivier
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