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authorYinghai Lu <Yinghai.Lu@Sun.COM>2007-07-21 17:11:28 +0200
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 18:37:13 -0700
commitbc2cea6a34fdb30f118ec75db39a46a191870607 (patch)
tree823a027872cad6165530323b9b2196f9ef82ce29 /arch/x86_64
parent48dd9343d0bb54362a2ba65380fea7c8f07f9e74 (diff)
x86_64: disable the GART in shutdown
For K8 system: 4G RAM with memory hole remapping enabled, or more than 4G RAM installed. when using kexec to load second kernel. In the second kernel, when mem is allocated for GART, it will do the memset for clear, it will cause restart, because some device still used that for dma. solution will be: in second kernel: disable that at first before we try to allocate mem for it. or in the first kernel: do disable that before shutdown. Andi/Eric/Alan prefer to second one for clean shutdown in first kernel. Andi also point out need to consider to AGP enable but mem less 4G case too. Signed-off-by: Yinghai Lu <yinghai.lu@sun.com> Cc: Alan Cox <alan@lxorguk.ukuu.org.uk> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Muli Ben-Yehuda <muli@il.ibm.com> Cc: Vivek Goyal <vgoyal@in.ibm.com> Cc: Dave Jones <davej@codemonkey.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86_64')
-rw-r--r--arch/x86_64/kernel/pci-dma.c5
-rw-r--r--arch/x86_64/kernel/pci-gart.c20
-rw-r--r--arch/x86_64/kernel/reboot.c4
3 files changed, 29 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c
index 90f6315d02d..be8dce40f65 100644
--- a/arch/x86_64/kernel/pci-dma.c
+++ b/arch/x86_64/kernel/pci-dma.c
@@ -321,6 +321,11 @@ static int __init pci_iommu_init(void)
return 0;
}
+void pci_iommu_shutdown(void)
+{
+ gart_iommu_shutdown();
+}
+
#ifdef CONFIG_PCI
/* Many VIA bridges seem to corrupt data for DAC. Disable it here */
diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index e587b65e754..12acafdca79 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -571,6 +571,26 @@ static const struct dma_mapping_ops gart_dma_ops = {
.unmap_sg = gart_unmap_sg,
};
+void gart_iommu_shutdown(void)
+{
+ struct pci_dev *dev;
+ int i;
+
+ if (no_agp && (dma_ops != &gart_dma_ops))
+ return;
+
+ for (i = 0; i < num_k8_northbridges; i++) {
+ u32 ctl;
+
+ dev = k8_northbridges[i];
+ pci_read_config_dword(dev, 0x90, &ctl);
+
+ ctl &= ~1;
+
+ pci_write_config_dword(dev, 0x90, ctl);
+ }
+}
+
void __init gart_iommu_init(void)
{
struct agp_kern_info info;
diff --git a/arch/x86_64/kernel/reboot.c b/arch/x86_64/kernel/reboot.c
index 7503068e788..e6e65c2c63e 100644
--- a/arch/x86_64/kernel/reboot.c
+++ b/arch/x86_64/kernel/reboot.c
@@ -16,6 +16,7 @@
#include <asm/pgtable.h>
#include <asm/tlbflush.h>
#include <asm/apic.h>
+#include <asm/proto.h>
/*
* Power off function, if any
@@ -81,6 +82,7 @@ static inline void kb_wait(void)
void machine_shutdown(void)
{
unsigned long flags;
+
/* Stop the cpus and apics */
#ifdef CONFIG_SMP
int reboot_cpu_id;
@@ -111,6 +113,8 @@ void machine_shutdown(void)
disable_IO_APIC();
local_irq_restore(flags);
+
+ pci_iommu_shutdown();
}
void machine_emergency_restart(void)