From 58f7c98850a226d3fb05b1095af9f7c4ea3507ba Mon Sep 17 00:00:00 2001
From: Yinghai Lu <yhlu.kernel@gmail.com>
Date: Thu, 28 Aug 2008 13:52:25 -0700
Subject: x86: split e820 reserved entries record to late v2

so could let BAR res register at first, or even pnp.

v2: insert e820 reserve resources before pnp_system_init

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 arch/x86/pci/i386.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 79 insertions(+)

(limited to 'arch/x86/pci')

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 8791fc55e71..40811efaa25 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -31,8 +31,12 @@
 #include <linux/ioport.h>
 #include <linux/errno.h>
 #include <linux/bootmem.h>
+#include <linux/acpi.h>
 
 #include <asm/pat.h>
+#include <asm/hpet.h>
+#include <asm/io_apic.h>
+#include <asm/e820.h>
 
 #include "pci.h"
 
@@ -77,6 +81,77 @@ pcibios_align_resource(void *data, struct resource *res,
 }
 EXPORT_SYMBOL(pcibios_align_resource);
 
+static int check_res_with_valid(struct pci_dev *dev, struct resource *res)
+{
+	unsigned long base;
+	unsigned long size;
+	int i;
+
+	base = res->start;
+	size = (res->start == 0 && res->end == res->start) ? 0 :
+		 (res->end - res->start + 1);
+
+	if (!base || !size)
+		return 0;
+
+#ifdef CONFIG_HPET_TIMER
+	/* for hpet */
+	if (base == hpet_address && (res->flags & IORESOURCE_MEM)) {
+		dev_info(&dev->dev, "BAR has HPET at %08lx-%08lx\n",
+				 base, base + size - 1);
+		return 1;
+	}
+#endif
+
+#ifdef CONFIG_X86_IO_APIC
+	for (i = 0; i < nr_ioapics; i++) {
+		unsigned long ioapic_phys = mp_ioapics[i].mp_apicaddr;
+
+		if (base == ioapic_phys && (res->flags & IORESOURCE_MEM)) {
+			dev_info(&dev->dev, "BAR has ioapic at %08lx-%08lx\n",
+					 base, base + size - 1);
+			return 1;
+		}
+	}
+#endif
+
+#ifdef CONFIG_PCI_MMCONFIG
+	for (i = 0; i < pci_mmcfg_config_num; i++) {
+		unsigned long addr;
+
+		addr = pci_mmcfg_config[i].address;
+		if (base == addr && (res->flags & IORESOURCE_MEM)) {
+			dev_info(&dev->dev, "BAR has MMCONFIG at %08lx-%08lx\n",
+					 base, base + size - 1);
+			return 1;
+		}
+	}
+#endif
+
+	return 0;
+}
+
+static int check_platform(struct pci_dev *dev, struct resource *res)
+{
+	struct resource *root = NULL;
+
+	/*
+	 * forcibly insert it into the
+	 * resource tree
+	 */
+	if (res->flags & IORESOURCE_MEM)
+		root = &iomem_resource;
+	else if (res->flags & IORESOURCE_IO)
+		root = &ioport_resource;
+
+	if (root && check_res_with_valid(dev, res)) {
+		insert_resource(root, res);
+
+		return 1;
+	}
+
+	return 0;
+}
 /*
  *  Handle resources of PCI devices.  If the world were perfect, we could
  *  just allocate all the resource regions and do nothing more.  It isn't.
@@ -128,6 +203,8 @@ static void __init pcibios_allocate_bus_resources(struct list_head *bus_list)
 				pr = pci_find_parent_resource(dev, r);
 				if (!r->start || !pr ||
 				    request_resource(pr, r) < 0) {
+					if (check_platform(dev, r))
+						continue;
 					dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
 					/*
 					 * Something is wrong with the region.
@@ -169,6 +246,8 @@ static void __init pcibios_allocate_resources(int pass)
 					r->flags, disabled, pass);
 				pr = pci_find_parent_resource(dev, r);
 				if (!pr || request_resource(pr, r) < 0) {
+					if (check_platform(dev, r))
+						continue;
 					dev_err(&dev->dev, "BAR %d: can't allocate resource\n", idx);
 					/* We'll assign a new address later */
 					r->end -= r->start;
-- 
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