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>
diff --git a/arch/x86_64/kernel/pci-dma.c b/arch/x86_64/kernel/pci-dma.c
index 90f6315..be8dce4 100644
--- a/arch/x86_64/kernel/pci-dma.c
+++ b/arch/x86_64/kernel/pci-dma.c
@@ -321,6 +321,11 @@
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 e587b65..12acafd 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -571,6 +571,26 @@
.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 7503068..e6e65c2 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 @@
void machine_shutdown(void)
{
unsigned long flags;
+
/* Stop the cpus and apics */
#ifdef CONFIG_SMP
int reboot_cpu_id;
@@ -111,6 +113,8 @@
disable_IO_APIC();
local_irq_restore(flags);
+
+ pci_iommu_shutdown();
}
void machine_emergency_restart(void)