Commit 3e6e0d80 authored Jan 21, 2012 by Yinghai Lu Committed by Jesse Barnes Feb 14, 2012

PCI: try to assign required+option size first



We found reassignment can not find a range for one resource, even if the
total available range is large enough.

bridge b1:02.0 will need 2M+3M
bridge b1:03.0 will need 2M+3M

so bridge b0:00.0 will get assigned: 4M : [f8000000-f83fffff]
   later is reassigned to 10M : [f8000000-f9ffffff]

b1:02.0 is assigned to 2M : [f8000000-f81fffff]
b1:03.0 is assigned to 2M : [f8200000-f83fffff]

After that b1:03.0 get chance to be reassigned to [f8200000-f86fffff],
but b1:02.0 will not have chance to expand, because b1:03.0 is using in
middle one.

[  187.911401] pci 0000:b1:02.0: bridge window [mem 0x00100000-0x002fffff] to [bus b2-b2] add_size 300000
[  187.920764] pci 0000:b1:03.0: bridge window [mem 0x00100000-0x002fffff] to [bus b3-b3] add_size 300000
[  187.930129] pci 0000:b1:02.0: [mem 0x00100000-0x002fffff] get_res_add_size  add_size 300000
[  187.938500] pci 0000:b1:03.0: [mem 0x00100000-0x002fffff] get_res_add_size  add_size 300000
[  187.946857] pci 0000:b0:00.0: bridge window [mem 0x00100000-0x004fffff] to [bus b1-b3] add_size 600000
[  187.956206] pci 0000:b0:00.0: BAR 14: assigned [mem 0xf8000000-0xf83fffff]
[  187.963102] pci 0000:b0:00.0: BAR 15: assigned [mem 0xf5000000-0xf51fffff pref]
[  187.970434] pci 0000:b0:00.0: BAR 14: reassigned [mem 0xf8000000-0xf89fffff]
[  187.977497] pci 0000:b1:02.0: BAR 14: assigned [mem 0xf8000000-0xf81fffff]
[  187.984383] pci 0000:b1:02.0: BAR 15: assigned [mem 0xf5000000-0xf50fffff pref]
[  187.991695] pci 0000:b1:03.0: BAR 14: assigned [mem 0xf8200000-0xf83fffff]
[  187.998576] pci 0000:b1:03.0: BAR 15: assigned [mem 0xf5100000-0xf51fffff pref]
[  188.005888] pci 0000:b1:03.0: BAR 14: reassigned [mem 0xf8200000-0xf86fffff]
[  188.012939] pci 0000:b1:02.0: BAR 14: can't assign mem (size 0x200000)
[  188.019471] pci 0000:b1:02.0: failed to add 300000 to res=[mem 0xf8000000-0xf81fffff]
[  188.027326] pci 0000:b2:00.0: reg 184: [mem 0x00000000-0x00003fff 64bit]
[  188.034071] pci 0000:b2:00.0: reg 18c: [mem 0x00000000-0x000fffff 64bit]
[  188.040795] pci 0000:b2:00.0: BAR 2: assigned [mem 0xf8000000-0xf80fffff 64bit]
[  188.048119] pci 0000:b2:00.0: BAR 2: set to [mem 0xf8000000-0xf80fffff 64bit] (PCI address [0xf8000000-0xf80fffff])
[  188.058550] pci 0000:b2:00.0: BAR 6: assigned [mem 0xf5000000-0xf50fffff pref]
[  188.065802] pci 0000:b2:00.0: BAR 0: assigned [mem 0xf8100000-0xf8103fff 64bit]
[  188.073125] pci 0000:b2:00.0: BAR 0: set to [mem 0xf8100000-0xf8103fff 64bit] (PCI address [0xf8100000-0xf8103fff])
[  188.083596] pci 0000:b2:00.0: reg 18c: [mem 0x00000000-0x000fffff 64bit]
[  188.090310] pci 0000:b2:00.0: BAR 9: can't assign mem (size 0x300000)
[  188.096773] pci 0000:b2:00.0: reg 184: [mem 0x00000000-0x00003fff 64bit]
[  188.103479] pci 0000:b2:00.0: BAR 7: assigned [mem 0xf8104000-0xf810ffff 64bit]
[  188.110801] pci 0000:b2:00.0: BAR 7: set to [mem 0xf8104000-0xf810ffff 64bit] (PCI address [0xf8104000-0xf810ffff])
[  188.121256] pci 0000:b1:02.0: PCI bridge to [bus b2-b2]
[  188.126512] pci 0000:b1:02.0:   bridge window [mem 0xf8000000-0xf81fffff]
[  188.133328] pci 0000:b1:02.0:   bridge window [mem 0xf5000000-0xf50fffff pref]
[  188.140608] pci 0000:b3:00.0: reg 184: [mem 0x00000000-0x00003fff 64bit]
[  188.147341] pci 0000:b3:00.0: reg 18c: [mem 0x00000000-0x000fffff 64bit]
[  188.154076] pci 0000:b3:00.0: BAR 2: assigned [mem 0xf8200000-0xf82fffff 64bit]
[  188.161417] pci 0000:b3:00.0: BAR 2: set to [mem 0xf8200000-0xf82fffff 64bit] (PCI address [0xf8200000-0xf82fffff])
[  188.171865] pci 0000:b3:00.0: BAR 6: assigned [mem 0xf5100000-0xf51fffff pref]
[  188.179090] pci 0000:b3:00.0: BAR 0: assigned [mem 0xf8300000-0xf8303fff 64bit]
[  188.186431] pci 0000:b3:00.0: BAR 0: set to [mem 0xf8300000-0xf8303fff 64bit] (PCI address [0xf8300000-0xf8303fff])
[  188.196884] pci 0000:b3:00.0: reg 18c: [mem 0x00000000-0x000fffff 64bit]
[  188.203591] pci 0000:b3:00.0: BAR 9: assigned [mem 0xf8400000-0xf86fffff 64bit]
[  188.210909] pci 0000:b3:00.0: BAR 9: set to [mem 0xf8400000-0xf86fffff 64bit] (PCI address [0xf8400000-0xf86fffff])
[  188.221379] pci 0000:b3:00.0: reg 184: [mem 0x00000000-0x00003fff 64bit]
[  188.228089] pci 0000:b3:00.0: BAR 7: assigned [mem 0xf8304000-0xf830ffff 64bit]
[  188.235407] pci 0000:b3:00.0: BAR 7: set to [mem 0xf8304000-0xf830ffff 64bit] (PCI address [0xf8304000-0xf830ffff])
[  188.245843] pci 0000:b1:03.0: PCI bridge to [bus b3-b3]
[  188.251107] pci 0000:b1:03.0:   bridge window [mem 0xf8200000-0xf86fffff]
[  188.257922] pci 0000:b1:03.0:   bridge window [mem 0xf5100000-0xf51fffff pref]
[  188.265180] pci 0000:b0:00.0: PCI bridge to [bus b1-b3]
[  188.270443] pci 0000:b0:00.0:   bridge window [mem 0xf8000000-0xf89fffff]
[  188.277250] pci 0000:b0:00.0:   bridge window [mem 0xf5000000-0xf51fffff pref]
[  188.284512] pcieport 0000:80:02.2: PCI bridge to [bus b0-bf]
[  188.290184] pcieport 0000:80:02.2:   bridge window [io  0xa000-0xbfff]
[  188.296735] pcieport 0000:80:02.2:   bridge window [mem 0xf8000000-0xf8ffffff]
[  188.303963] pcieport 0000:80:02.2:   bridge window [mem 0xf5000000-0xf5ffffff 64bit pref]

Thus b2:00.0 BAR 9 does not get assigned...

root cause:
b1:02.0 can not be added more range, because b1:03.0 is just after it;
no space between the required ranges.

Solution:
Try to assign required + optional all together at first, and if that
fails, try again with just the required resources.

-v2: seperate add_to_list change() to another patch according to Jesse.
     seperate get_res_add_size() moving to another patch according to Jesse.
     add !realloc_head->next check if the list is empty to bail early
     according to Jesse.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

parent 1c372353

drivers/pci/setup-bus.c

+82 −1

Original line number	Diff line number	Diff line
		@@ -99,6 +99,24 @@ static void add_to_failed_list(struct resource_list_x *head,
		0 /* dont care */);
		}

		static void remove_from_list(struct resource_list_x *realloc_head,
		struct resource *res)
		{
		struct resource_list_x prev, tmp, *list;

		prev = realloc_head;
		for (list = realloc_head->next; list;) {
		if (list->res != res) {
		prev = list;
		list = list->next;
		continue;
		}
		tmp = list;
		prev->next = list = list->next;
		kfree(tmp);
		}
		}

		static resource_size_t get_res_add_size(struct resource_list_x *realloc_head,
		struct resource *res)
		{
		@@ -108,8 +126,13 @@ static resource_size_t get_res_add_size(struct resource_list_x *realloc_head,
		for (list = realloc_head->next; list && list->res != res;
		list = list->next)
		;
		if (list)

		if (list) {
		dev_printk(KERN_DEBUG, &list->dev->dev,
		"%pR get_res_add_size add_size %llx\n",
		list->res, (unsigned long long)list->add_size);
		return list->add_size;
		}

		return 0;
		}
		@@ -238,6 +261,64 @@ static void __assign_resources_sorted(struct resource_list *head,
		struct resource_list_x *realloc_head,
		struct resource_list_x *fail_head)
		{
		/*
		* Should not assign requested resources at first.
		* they could be adjacent, so later reassign can not reallocate
		* them one by one in parent resource window.
		* Try to assign requested + add_size at begining
		* if could do that, could get out early.
		* if could not do that, we still try to assign requested at first,
		* then try to reassign add_size for some resources.
		*/
		struct resource_list_x save_head, local_fail_head, *list;
		struct resource_list *l;

		/* Check if optional add_size is there */
		if (!realloc_head \|\| !realloc_head->next)
		goto requested_and_reassign;

		/* Save original start, end, flags etc at first */
		save_head.next = NULL;
		for (l = head->next; l; l = l->next)
		if (add_to_list(&save_head, l->dev, l->res, 0, 0)) {
		free_list(resource_list_x, &save_head);
		goto requested_and_reassign;
		}

		/* Update res in head list with add_size in realloc_head list */
		for (l = head->next; l; l = l->next)
		l->res->end += get_res_add_size(realloc_head, l->res);

		/* Try updated head list with add_size added */
		local_fail_head.next = NULL;
		assign_requested_resources_sorted(head, &local_fail_head);

		/* all assigned with add_size ? */
		if (!local_fail_head.next) {
		/* Remove head list from realloc_head list */
		for (l = head->next; l; l = l->next)
		remove_from_list(realloc_head, l->res);
		free_list(resource_list_x, &save_head);
		free_list(resource_list, head);
		return;
		}

		free_list(resource_list_x, &local_fail_head);
		/* Release assigned resource */
		for (l = head->next; l; l = l->next)
		if (l->res->parent)
		release_resource(l->res);
		/* Restore start/end/flags from saved list */
		for (list = save_head.next; list; list = list->next) {
		struct resource *res = list->res;

		res->start = list->start;
		res->end = list->end;
		res->flags = list->flags;
		}
		free_list(resource_list_x, &save_head);

		requested_and_reassign:
		/* Satisfy the must-have resource requests */
		assign_requested_resources_sorted(head, fail_head);