On booting path, we don't pass realloc at first, and treat all optional just as required, in some case we can smaller size/align with optional than required only. 04:00.0 has four child bridges: 05:01.0, 05:02.0, 05:03.0, 05:04.0 pref layout after booting path like followings: pci 0000:04:00.0: BAR 9: assigned [mem 0x84000000-0x9fffffff 64bit pref] pci 0000:05:04.0: BAR 9: assigned [mem 0x88000000-0x9fffffff 64bit pref] pci 0000:05:03.0: BAR 9: assigned [mem 0x84000000-0x841fffff 64bit pref] pci 0000:05:03.0: PCI bridge to [bus 08-0f] pci 0000:05:03.0: bridge window [mem 0x84000000-0x841fffff 64bit pref] pci 0000:05:04.0: PCI bridge to [bus 10] pci 0000:05:04.0: bridge window [mem 0x88000000-0x9fffffff 64bit pref] pci 0000:04:00.0: PCI bridge to [bus 05-10] pci 0000:04:00.0: bridge window [mem 0x84000000-0x9fffffff 64bit pref] so the old size in rescan for 04:00.0 would be 0x1c000000, and align is 0x4000000 during remove and rescan: pci 0000:05:03.0: bridge window [mem 0x00000000-0xffffffffffffffff 64bit pref] to [bus 08-0f] add_size 200000 add_align 100000 alt_size 0 alt_align 0 must_size 0 must_align 0 pci 0000:05:03.0: bridge window [mem 0x00000000-0xffffffffffffffff] to [bus 08-0f] add_size 200000 add_align 100000 alt_size 0 alt_align 0 must_size 0 must_align 0 pci 0000:05:04.0: bridge window [mem 0x08000000-0x1fffffff 64bit pref] to [bus 10] add_size 0 add_align 0 alt_size 10100000 alt_align 10000000 must_size 18000000 must_align 8000000 pci 0000:05:03.0: BAR 9: [mem 0x00000000-0xffffffffffffffff 64bit pref] get_res_add_size add_size 200000 pci 0000:05:03.0: BAR 9: [mem 0x00000000-0xffffffffffffffff 64bit pref] get_res_add_align min_align 100000 pci 0000:04:00.0: bridge window [mem 0x08000000-0x27ffffff 64bit pref] to [bus 05-10] add_size 0 add_align 0 alt_size 10100000 alt_align 10000000 must_size 20000000 must_align 8000000 align old size 0x1c000000 to 0x2000000 as size0, 0x1c000000 as size1. so for 04:00.0 will have big must and no optional size anymore. So don't align old size, then we will have same size0 and size1. Also use smaller add_align as must align. After the patch, rescan works properly. Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx> --- drivers/pci/setup-bus.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 42552b2..de47692 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -1140,9 +1140,9 @@ static resource_size_t calculate_memsize(resource_size_t size, size = min_size; if (old_size == 1) old_size = 0; + size = ALIGN(size, align); if (size < old_size) size = old_size; - size = ALIGN(size, align); return size; } @@ -1626,6 +1626,17 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, b_res->flags = 0; return 0; } + + /* + * It happens when boot path is not passing realloc + * and later rescan is passing realloc. + * The old value from boot path is bigger, and calculate_size will + * use old value as size0 and size1, and also have + * chance optional align is smaller than must only align. + */ + if(size0 == size1 && min_align > min_add_align) + min_align = min_add_align; + b_res->start = min_align; b_res->end = size0 + min_align - 1; b_res->flags |= IORESOURCE_STARTALIGN; -- 1.8.4.5 -- 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
