On Mon, Mar 3, 2014 at 9:49 AM, Tim Harvey <tharvey@xxxxxxxxxxxxx> wrote: > On Mon, Mar 3, 2014 at 12:11 AM, Jingoo Han <jg1.han@xxxxxxxxxxx> wrote: >> On Sunday, March 02, 2014 3:31 AM, Jason Gunthorpe wrote: >>> On Fri, Feb 28, 2014 at 04:53:33PM -0800, Tim Harvey wrote: >>> <snip> > The configuration I'm testing is: > root@OpenWrt:/# lspci -n > 00:00.0 0604: 16c3:abcd (rev 01) > 01:00.0 0604: 10b5:8609 (rev ba) > 01:00.1 0880: 10b5:8609 (rev ba) > 02:01.0 0604: 10b5:8609 (rev ba) > 02:04.0 0604: 10b5:8609 (rev ba) > 02:05.0 0604: 10b5:8609 (rev ba) > 02:06.0 0604: 10b5:8609 (rev ba) > 02:07.0 0604: 10b5:8609 (rev ba) > 02:08.0 0604: 10b5:8609 (rev ba) > 02:09.0 0604: 10b5:8609 (rev ba) > 07:00.0 0280: 168c:002b (rev 01) > 08:00.0 0200: 11ab:4380 > root@OpenWrt:/# lspci -tnv > -[0000:00]---00.0-[01-09]--+-00.0-[02-09]--+-01.0-[03]-- > | +-04.0-[04]-- > | +-05.0-[05]-- > | +-06.0-[06]-- > | +-07.0-[07]----00.0 168c:002b > | +-08.0-[08]----00.0 11ab:4380 > | \-09.0-[09]-- > \-00.1 10b5:8609 > > > The dev_info showing what of_irq_parse_and_map_pci() above produces: > [ 1.818485] pci 0000:00:00.0: dw_pcie_map_irq: 16c3:abcd slot0 pin1 irq20 > [ 1.818703] pci 0000:01:00.0: dw_pcie_map_irq: 10b5:8609 slot0 pin1 irq20 > [ 1.818939] pci 0000:01:00.1: dw_pcie_map_irq: 10b5:8609 slot0 pin2 irq0 > [ 1.819179] pci 0000:02:01.0: dw_pcie_map_irq: 10b5:8609 slot0 pin2 irq0 > [ 1.819395] pci 0000:02:04.0: dw_pcie_map_irq: 10b5:8609 slot0 pin1 irq20 > [ 1.819631] pci 0000:02:05.0: dw_pcie_map_irq: 10b5:8609 slot0 pin2 irq0 > [ 1.819859] pci 0000:02:06.0: dw_pcie_map_irq: 10b5:8609 slot0 pin3 irq0 > [ 1.820087] pci 0000:02:07.0: dw_pcie_map_irq: 10b5:8609 slot0 pin4 irq0 > [ 1.820404] pci 0000:02:08.0: dw_pcie_map_irq: 10b5:8609 slot0 pin1 irq20 > [ 1.820650] pci 0000:02:09.0: dw_pcie_map_irq: 10b5:8609 slot0 pin2 irq0 > [ 1.820881] pci 0000:07:00.0: dw_pcie_map_irq: 168c:002b slot0 pin4 irq0 > [ 1.821100] pci 0000:08:00.0: dw_pcie_map_irq: 11ab:4380 slot0 pin1 irq20 > > I'm not clear why irq 20 is getting returned for all the slots with > (slot%4)=0 and func=0. If I start debugging of_irq_parse_pci() I see > that it walks up the tree until it gets to the pcie host controller > then calls of_irq_parse_raw() which is returning irq20 or -EINVAL. For the slots above that are swizzling to pin1 this appears to be an issue with irq_create_of_mapping() called form of_irq_parse_and_map_pci(). The GIC function that translates the interrupt per domain is given irq_data: 0x123 0x04 0x00 (meaning GIC IRQ 123, which should get 32 added to it for irq155). Instead, the implementation of gic_irq_domain_xlate() (http://lxr.missinglinkelectronics.com/linux/drivers/irqchip/irq-gic.c#L832) adds 32 to the 0x04 returning 20: [ 1.841781] of_irq_parse_raw: /soc/pcie@0x01000000:00000001 [ 1.841813] of_irq_parse_raw: ipar=/soc/pcie@0x01000000, size=1 [ 1.841838] -> addrsize=3 [ 1.841870] -> match=1 (imaplen=28) [ 1.841903] -> newintsize=3, newaddrsize=1 [ 1.841916] -> imaplen=23 [ 1.841928] -> new parent: /interrupt-controller@00a01000 [ 1.841946] -> got it ! [ 1.841972] irq_create_of_mapping: calling xlate for 123/4/0 3 [ 1.841984] irq_create_of_mapping got irq from xlate: 20 ^^^^^ added debugging shows 3 u32's passed to xlate and returned value of 20 [ 1.841998] irq: irq_create_mapping(0xbec10400, 0x14) [ 1.842009] irq: -> using domain @bec10400 [ 1.842021] irq: -> existing mapping on virq 20 [ 1.842032] irq_create_of_mapping created virq=20 [ 1.842042] irq_create_of_mapping returning virq=20 [ 1.842059] pci 0000:00:00.0: dw_pcie_map_irq: 16c3:abcd slot0 pin1 irq20 Perhaps this is a byte-ordering issue? I'm wondering if the args created in of_irq_parse_pci are getting put in the wrong place for what irq_create_of_mapping() expects. For the slots above that swizzle to pin2,3,4 of_irq_parse_raw() returns -EINVAL because for some reason it can't match an interrupt mapping for the pcie host controller: [ 1.842996] of_irq_parse_raw: /soc/pcie@0x01000000/pcie@0,0:00000002 [ 1.843046] of_irq_parse_raw: ipar=/soc/pcie@0x01000000, size=1 [ 1.843070] -> addrsize=3 [ 1.843100] -> match=0 (imaplen=28) ^^^^^ indicates no match in interrupt map. I think this is because size=1 above, when we should see an interrupt-map of size 4. I'm guessing that the function is confused between the single interrupt in the DT for the host controller, vs the interrupt-map for the PCI interrupts. At this point, with no match, of_irq_parse_raw() will travel up to the parent of the interrupt which is wrong. Note the pcie host controller DT is: pcie: pcie@0x01000000 { compatible = "fsl,imx6q-pcie", "snps,dw-pcie"; reg = <0x01ffc000 0x4000>; /* DBI */ #address-cells = <3>; #size-cells = <2>; device_type = "pci"; ranges = <0x00000800 0 0x01f00000 0x01f00000 0 0x00080000 /* configuration space */ 0x81000000 0 0 0x01f80000 0 0x00010000 /* downstream I/O */ 0x82000000 0 0x01000000 0x01000000 0 0x00f00000>; /* non-prefetchable memory */ num-lanes = <1>; interrupts = <0 123 0x04>; #interrupt-cells = <1>; interrupt-map-mask = <0 0 0 0x7>; interrupt-map = <0 0 0 1 &intc GIC_SPI 123 IRQ_TYPE_LEVEL_HIGH>, <0 0 0 2 &intc GIC_SPI 122 IRQ_TYPE_LEVEL_HIGH>, <0 0 0 3 &intc GIC_SPI 121 IRQ_TYPE_LEVEL_HIGH>, <0 0 0 4 &intc GIC_SPI 120 IRQ_TYPE_LEVEL_HIGH>; clocks = <&clks 189>, <&clks 187>, <&clks 206>, <&clks 144>; clock-names = "pcie_ref_125m", "sata_ref_100m", "lvds_gate", "pcie_axi"; status = "disabled"; }; Tim > > Tim > >> You can test i.MX PCIe with this. >> >> ./drivers/pci/host/pcie-designware.c >> @@ -726,7 +727,7 @@ static struct pci_bus *dw_pcie_scan_bus(int nr, struct pci_sys_data *sys) >> >> if (pp) { >> pp->root_bus_nr = sys->busnr; >> - bus = pci_scan_root_bus(NULL, sys->busnr, &dw_pcie_ops, >> + bus = pci_scan_root_bus(pp->dev, sys->busnr, &dw_pcie_ops, >> sys, &sys->resources); >> } else { >> bus = NULL; >> >> However, I think that we may need to replace 'pci_common_init()' >> with 'pci_common_init_dev()'. >> >> Best regards, >> Jingoo Han >> -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
