linux-kernel - [PATCH 5/5] PCI MMConfig: Reserve resources but only when we're sure about them.

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Message-ID: <20061207183106.GE73583@dspnet.fr.eu.org>
Date:	Thu, 7 Dec 2006 19:31:06 +0100
From:	Olivier Galibert <galibert@...ox.com>
To:	Andi Kleen <ak@...e.de>, linux-pci@...ey.karlin.mff.cuni.cz,
	"Hack inc." <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Muli Ben-Yehuda <muli@...ibm.com>
Subject: [PATCH 5/5] PCI MMConfig: Reserve resources but only when we're sure about them.

Put back the resource reservation as per
4c6e052adfe285ede5884e4e8c4d33af33932c13 but use it *only* when the
range(s) come from a chipset probe instead of the bios.

Signed-off-by: Olivier Galibert <galibert@...ox.com>
---
 arch/i386/pci/mmconfig-shared.c |   33 +++++++++++++++++++++++++++++++++
 1 files changed, 33 insertions(+), 0 deletions(-)

diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index 302d495..0da1e3b 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -159,6 +159,37 @@ static int __init pci_mmcfg_check_hostbridge(void)
 	return name != NULL;
 }
 
+static __init void pci_mmcfg_insert_resources(void)
+{
+#define PCI_MMCFG_RESOURCE_NAME_LEN 19
+	int i;
+	struct resource *res;
+	char *names;
+	unsigned num_buses;
+
+	res = kcalloc(PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res),
+			pci_mmcfg_config_num, GFP_KERNEL);
+
+	if (!res) {
+		printk(KERN_ERR "PCI: Unable to allocate MMCONFIG resources\n");
+		return;
+	}
+
+	names = (void *)&res[pci_mmcfg_config_num];
+	for (i = 0; i < pci_mmcfg_config_num; i++, res++) {
+		num_buses = pci_mmcfg_config[i].end_bus_number -
+		    pci_mmcfg_config[i].start_bus_number + 1;
+		res->name = names;
+		snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u",
+			pci_mmcfg_config[i].pci_segment_group_number);
+		res->start = pci_mmcfg_config[i].base_address;
+		res->end = res->start + (num_buses << 20) - 1;
+		res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+		insert_resource(&iomem_resource, res);
+		names += PCI_MMCFG_RESOURCE_NAME_LEN;
+	}
+}
+
 void __init pci_mmcfg_init(int type)
 {
 	int known_bridge = 0;
@@ -192,6 +223,8 @@ void __init pci_mmcfg_init(int type)
 	if (pci_mmcfg_arch_init()) {
 		if (type == 1)
 			unreachable_devices();
+		if (known_bridge)
+			pci_mmcfg_insert_resources();
 		pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
 	}
 }
-- 
1.4.4.1.g278f

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