openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[PATCH] x86_64: Calgary IOMMU - IOMMU abstractions 

This patch creates a new interface for IOMMUs by adding a centralized
location for IOMMU allocation (for translation tables/apertures) and
IOMMU initialization.  In creating these, code was moved around for
abstraction, uniformity, and consiceness.

Take note of the move of the iommu_setup bootarg parsing code to
__setup.  This is enabled by moving back the location of the aperture
allocation/detection to mem init (which while ugly, was already the
location of the swiotlb_init).

While a slight departure from the previous patch, I belive this provides
the true intention of the previous versions of the patch which changed
this code.  It also makes the addition of the upcoming calgary code much
cleaner than previous patches.

[AK: Removed one broken change. iommu_setup still has to be called
early]

Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Jon Mason <jdmason@us.ibm.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jon Mason 2006-06-26 13:58:11 +02:00 committed by Linus Torvalds
parent a3c042a0f0
commit 0dc243ae10
6 changed files with 42 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
arch/x86_64/kernel/pci-dma.c
View File

@ -279,3 +279,32 @@ __init int iommu_setup(char *p)
}
return 1;
}
__setup("iommu=", iommu_setup);
void __init pci_iommu_alloc(void)
{
/*
* The order of these functions is important for
* fall-back/fail-over reasons
*/
#ifdef CONFIG_IOMMU
iommu_hole_init();
#endif
#ifdef CONFIG_SWIOTLB
pci_swiotlb_init();
#endif
}
static int __init pci_iommu_init(void)
{
#ifdef CONFIG_IOMMU
gart_iommu_init();
#endif
no_iommu_init();
return 0;
}
/* Must execute after PCI subsystem */
fs_initcall(pci_iommu_init);

13
arch/x86_64/kernel/pci-gart.c
View File

@ -571,7 +571,7 @@ static struct dma_mapping_ops gart_dma_ops = {
.unmap_sg = gart_unmap_sg,
};
static int __init pci_iommu_init(void)
void __init gart_iommu_init(void)
{
struct agp_kern_info info;
unsigned long aper_size;
@ -581,7 +581,7 @@ static int __init pci_iommu_init(void)
if (cache_k8_northbridges() < 0 || num_k8_northbridges == 0) {
printk(KERN_INFO "PCI-GART: No AMD northbridge found.\n");
return -ENODEV;
return;
}
#ifndef CONFIG_AGP_AMD64
@ -595,11 +595,11 @@ static int __init pci_iommu_init(void)
#endif
if (swiotlb)
return -ENODEV;
return;
/* Did we detect a different HW IOMMU? */
if (iommu_detected && !iommu_aperture)
return -1;
return;
if (no_iommu ||
(!force_iommu && end_pfn <= MAX_DMA32_PFN) ||
@ -611,7 +611,7 @@ static int __init pci_iommu_init(void)
"but IOMMU not available.\n"
KERN_ERR "WARNING 32bit PCI may malfunction.\n");
}
return -ENODEV;
return;
}
printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
@ -678,11 +678,10 @@ static int __init pci_iommu_init(void)
flush_gart();
dma_ops = &gart_dma_ops;
return 0;
}
/* Must execute after PCI subsystem */
fs_initcall(pci_iommu_init);
fs_initcall(gart_iommu_init);
void gart_parse_options(char *p)
{

5
arch/x86_64/kernel/setup.c
View File

@ -63,7 +63,6 @@
#include <asm/setup.h>
#include <asm/mach_apic.h>
#include <asm/numa.h>
#include <asm/swiotlb.h>
#include <asm/sections.h>
#include <asm/dmi.h>
@ -702,10 +701,6 @@ void __init setup_arch(char **cmdline_p)
e820_setup_gap();
#ifdef CONFIG_IOMMU
iommu_hole_init();
#endif
#ifdef CONFIG_VT
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;

7
arch/x86_64/mm/init.c
View File

@ -41,8 +41,6 @@
#include <asm/proto.h>
#include <asm/smp.h>
#include <asm/sections.h>
#include <asm/dma-mapping.h>
#include <asm/swiotlb.h>
#ifndef Dprintk
#define Dprintk(x...)
@ -587,10 +585,7 @@ void __init mem_init(void)
{
long codesize, reservedpages, datasize, initsize;
#ifdef CONFIG_SWIOTLB
pci_swiotlb_init();
#endif
no_iommu_init();
pci_iommu_alloc();
/* How many end-of-memory variables you have, grandma! */
max_low_pfn = end_pfn;

2
include/asm-x86_64/pci.h
View File

@ -39,8 +39,8 @@ int pcibios_set_irq_routing(struct pci_dev *dev, int pin, int irq);
#include <asm/scatterlist.h>
#include <linux/string.h>
#include <asm/page.h>
#include <linux/dma-mapping.h> /* for have_iommu */
extern void pci_iommu_alloc(void);
extern int iommu_setup(char *opt);
/* The PCI address space does equal the physical memory

10
include/asm-x86_64/proto.h
View File

@ -37,7 +37,6 @@ extern void ia32_sysenter_target(void);
extern void config_acpi_tables(void);
extern void ia32_syscall(void);
extern void iommu_hole_init(void);
extern int pmtimer_mark_offset(void);
extern void pmtimer_resume(void);
@ -101,13 +100,9 @@ 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 unsigned long table_start, table_end;
extern int exception_trace;
extern int force_iommu, no_iommu;
extern int using_apic_timer;
extern int disable_apic;
extern unsigned cpu_khz;
@ -116,8 +111,13 @@ extern int skip_ioapic_setup;
extern int acpi_ht;
extern int acpi_disabled;
extern void no_iommu_init(void);
extern int force_iommu, no_iommu;
extern int iommu_detected;
#ifdef CONFIG_IOMMU
extern void gart_iommu_init(void);
extern void gart_parse_options(char *);
extern void iommu_hole_init(void);
extern int fallback_aper_order;
extern int fallback_aper_force;
extern int iommu_aperture;