This is a note to let you know that I've just added the patch titled powerpc/pci/of: Parse unassigned resources to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: powerpc-pci-of-parse-unassigned-resources.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From dead1c845dbe97e0061dae2017eaf3bd8f8f06ee Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy <aik@xxxxxxxxx> Date: Wed, 26 Jun 2019 12:37:46 +1000 Subject: powerpc/pci/of: Parse unassigned resources From: Alexey Kardashevskiy <aik@xxxxxxxxx> commit dead1c845dbe97e0061dae2017eaf3bd8f8f06ee upstream. The pseries platform uses the PCI_PROBE_DEVTREE method of PCI probing which reads "assigned-addresses" of every PCI device and initializes the device resources. However if the property is missing or zero sized, then there is no fallback of any kind and the PCI resources remain undiscovered, i.e. pdev->resource[] array remains empty. This adds a fallback which parses the "reg" property in pretty much same way except it marks resources as "unset" which later make Linux assign those resources proper addresses. This has an effect when: 1. a hypervisor failed to assign any resource for a device; 2. /chosen/linux,pci-probe-only=0 is in the DT so the system may try assigning a resource. Neither is likely to happen under PowerVM. Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Guenter Roeck <linux@xxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/powerpc/kernel/pci_of_scan.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) --- a/arch/powerpc/kernel/pci_of_scan.c +++ b/arch/powerpc/kernel/pci_of_scan.c @@ -82,10 +82,16 @@ static void of_pci_parse_addrs(struct de const __be32 *addrs; u32 i; int proplen; + bool mark_unset = false; addrs = of_get_property(node, "assigned-addresses", &proplen); - if (!addrs) - return; + if (!addrs || !proplen) { + addrs = of_get_property(node, "reg", &proplen); + if (!addrs || !proplen) + return; + mark_unset = true; + } + pr_debug(" parse addresses (%d bytes) @ %p\n", proplen, addrs); for (; proplen >= 20; proplen -= 20, addrs += 5) { flags = pci_parse_of_flags(of_read_number(addrs, 1), 0); @@ -110,6 +116,8 @@ static void of_pci_parse_addrs(struct de continue; } res->flags = flags; + if (mark_unset) + res->flags |= IORESOURCE_UNSET; res->name = pci_name(dev); region.start = base; region.end = base + size - 1; Patches currently in stable-queue which might be from aik@xxxxxxxxx are queue-4.4/powerpc-pci-of-parse-unassigned-resources.patch