forked from Minki/linux
9ad3f2c7c6
Prepare for 32bit pci root bus
-v2: hpa said we should compare with (resource_size_t)~0
-v3: according to Linus to use MAX_RESOURCE instead.
also need need to put related patches together
-v4: according to Andrew, use min in cap_resource()
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-8-git-send-email-yinghai@kernel.org>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/range.h>
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#include "bus_numa.h"
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int pci_root_num;
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struct pci_root_info pci_root_info[PCI_ROOT_NR];
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void x86_pci_root_bus_res_quirks(struct pci_bus *b)
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{
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int i;
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int j;
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struct pci_root_info *info;
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/* don't go for it if _CRS is used already */
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if (b->resource[0] != &ioport_resource ||
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b->resource[1] != &iomem_resource)
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return;
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if (!pci_root_num)
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return;
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for (i = 0; i < pci_root_num; i++) {
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if (pci_root_info[i].bus_min == b->number)
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break;
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}
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if (i == pci_root_num)
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return;
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printk(KERN_DEBUG "PCI: peer root bus %02x res updated from pci conf\n",
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b->number);
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info = &pci_root_info[i];
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for (j = 0; j < info->res_num; j++) {
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struct resource *res;
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struct resource *root;
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res = &info->res[j];
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b->resource[j] = res;
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if (res->flags & IORESOURCE_IO)
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root = &ioport_resource;
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else
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root = &iomem_resource;
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insert_resource(root, res);
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}
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}
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void __devinit update_res(struct pci_root_info *info, resource_size_t start,
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resource_size_t end, unsigned long flags, int merge)
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{
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int i;
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struct resource *res;
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if (start > end)
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return;
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if (start == MAX_RESOURCE)
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return;
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if (!merge)
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goto addit;
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/* try to merge it with old one */
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for (i = 0; i < info->res_num; i++) {
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resource_size_t final_start, final_end;
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resource_size_t common_start, common_end;
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res = &info->res[i];
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if (res->flags != flags)
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continue;
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common_start = max(res->start, start);
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common_end = min(res->end, end);
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if (common_start > common_end + 1)
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continue;
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final_start = min(res->start, start);
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final_end = max(res->end, end);
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res->start = final_start;
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res->end = final_end;
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return;
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}
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addit:
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/* need to add that */
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if (info->res_num >= RES_NUM)
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return;
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res = &info->res[info->res_num];
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res->name = info->name;
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res->flags = flags;
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res->start = start;
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res->end = end;
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res->child = NULL;
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info->res_num++;
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}
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