[PATCH 3/3] x86-64: Calgary IOMMU - hook it in
From: Muli Ben-Yehuda
Date: Mon Mar 20 2006 - 03:54:53 EST
This patch hooks Calgary into the build and the x86-64 IOMMU
initialization paths.
This is patch -B2 against 2.6.16, with minor Kconfig updates.
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/arch/x86_64/Kconfig linux/arch/x86_64/Kconfig
--- iommu_detected/arch/x86_64/Kconfig 2006-03-20 09:12:23.000000000 +0200
+++ linux/arch/x86_64/Kconfig 2006-03-20 09:30:10.000000000 +0200
@@ -372,6 +372,19 @@ config GART_IOMMU
and a software emulation used on other systems.
If unsure, say Y.
+config CALGARY_IOMMU
+ bool "IBM x366 server IOMMU"
+ default y
+ depends on PCI && MPSC && EXPERIMENTAL
+ help
+ Support for hardware IOMMUs in IBM's xSeries x366 and x460
+ systems. Needed to run systems with more than 3GB of memory
+ properly with 32-bit PCI devices that do not support DAC
+ (Double Address Cycle). The IOMMU can be turned off at
+ boot time with the iommu=off parameter. Normally the kernel
+ will make the right choice by iteself.
+ If unsure, say Y.
+
# need this always enabled with GART_IOMMU for the VIA workaround
config SWIOTLB
bool
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/arch/x86_64/kernel/Makefile linux/arch/x86_64/kernel/Makefile
--- iommu_detected/arch/x86_64/kernel/Makefile 2006-03-20 09:12:24.000000000 +0200
+++ linux/arch/x86_64/kernel/Makefile 2006-03-20 09:30:11.000000000 +0200
@@ -29,6 +29,7 @@ obj-$(CONFIG_SOFTWARE_SUSPEND) += suspen
obj-$(CONFIG_CPU_FREQ) += cpufreq/
obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-$(CONFIG_GART_IOMMU) += pci-gart.o aperture.o
+obj-$(CONFIG_CALGARY_IOMMU) += pci-calgary.o tce.o
obj-$(CONFIG_SWIOTLB) += pci-swiotlb.o
obj-$(CONFIG_KPROBES) += kprobes.o
obj-$(CONFIG_X86_PM_TIMER) += pmtimer.o
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/arch/x86_64/kernel/pci-dma.c linux/arch/x86_64/kernel/pci-dma.c
--- iommu_detected/arch/x86_64/kernel/pci-dma.c 2006-03-20 09:15:17.000000000 +0200
+++ linux/arch/x86_64/kernel/pci-dma.c 2006-03-20 09:30:11.000000000 +0200
@@ -9,6 +9,7 @@
#include <linux/module.h>
#include <asm/io.h>
#include <asm/proto.h>
+#include <asm/calgary.h>
int iommu_merge __read_mostly = 0;
EXPORT_SYMBOL(iommu_merge);
@@ -270,3 +271,21 @@ __init int iommu_setup(char *p)
}
return 1;
}
+
+static int __init pci_iommu_init(void)
+{
+ int rc = 0;
+
+#ifdef CONFIG_GART_IOMMU
+ rc = gart_iommu_init();
+ if (!rc) /* success? */
+ return 0;
+#endif
+#ifdef CONFIG_CALGARY_IOMMU
+ rc = calgary_iommu_init();
+#endif
+ return rc;
+}
+
+/* Must execute after PCI subsystem */
+fs_initcall(pci_iommu_init);
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/arch/x86_64/kernel/pci-gart.c linux/arch/x86_64/kernel/pci-gart.c
--- iommu_detected/arch/x86_64/kernel/pci-gart.c 2006-03-20 09:15:17.000000000 +0200
+++ linux/arch/x86_64/kernel/pci-gart.c 2006-03-20 09:30:11.000000000 +0200
@@ -605,7 +605,7 @@ static struct dma_mapping_ops gart_dma_o
.unmap_sg = gart_unmap_sg,
};
-static int __init pci_iommu_init(void)
+int __init gart_iommu_init(void)
{
struct agp_kern_info info;
unsigned long aper_size;
@@ -725,10 +725,7 @@ static int __init pci_iommu_init(void)
return 0;
}
-/* Must execute after PCI subsystem */
-fs_initcall(pci_iommu_init);
-
-void gart_parse_options(char *p)
+void __init gart_parse_options(char *p)
{
int arg;
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/arch/x86_64/kernel/setup.c linux/arch/x86_64/kernel/setup.c
--- iommu_detected/arch/x86_64/kernel/setup.c 2006-03-20 09:12:25.000000000 +0200
+++ linux/arch/x86_64/kernel/setup.c 2006-03-20 09:30:11.000000000 +0200
@@ -67,6 +67,7 @@
#include <asm/swiotlb.h>
#include <asm/sections.h>
#include <asm/gart-mapping.h>
+#include <asm/calgary.h>
/*
* Machine setup..
@@ -388,6 +389,12 @@ static __init void parse_cmdline_early (
iommu_setup(from+6);
}
+#ifdef CONFIG_CALGARY_IOMMU
+ if (!memcmp(from,"calgary=",8)) {
+ calgary_parse_options(from+8);
+ }
+#endif
+
if (!memcmp(from,"oops=panic", 10))
panic_on_oops = 1;
@@ -747,6 +754,9 @@ void __init setup_arch(char **cmdline_p)
#ifdef CONFIG_GART_IOMMU
iommu_hole_init();
#endif
+#ifdef CONFIG_CALGARY_IOMMU
+ detect_calgary();
+#endif
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/include/asm-x86_64/pci.h linux/include/asm-x86_64/pci.h
--- iommu_detected/include/asm-x86_64/pci.h 2006-03-20 09:13:42.000000000 +0200
+++ linux/include/asm-x86_64/pci.h 2006-03-20 09:30:12.000000000 +0200
@@ -53,7 +53,7 @@ extern int iommu_setup(char *opt);
*/
#define PCI_DMA_BUS_IS_PHYS (dma_ops->is_phys)
-#ifdef CONFIG_GART_IOMMU
+#if defined(CONFIG_GART_IOMMU) || defined(CONFIG_CALGARY_IOMMU)
/*
* x86-64 always supports DAC, but sometimes it is useful to force
diff -Naurp --exclude-from /home/muli/w/dontdiff iommu_detected/include/asm-x86_64/proto.h linux/include/asm-x86_64/proto.h
--- iommu_detected/include/asm-x86_64/proto.h 2006-03-20 09:13:42.000000000 +0200
+++ linux/include/asm-x86_64/proto.h 2006-03-20 09:30:12.000000000 +0200
@@ -104,7 +104,9 @@ extern int unsynchronized_tsc(void);
extern void select_idle_routine(const struct cpuinfo_x86 *c);
extern void gart_parse_options(char *);
-extern void __init no_iommu_init(void);
+extern int gart_iommu_init(void);
+extern void no_iommu_init(void);
+extern void detect_calgary(void);
extern unsigned long table_start, table_end;
--
Muli Ben-Yehuda
http://www.mulix.org | http://mulix.livejournal.com/
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