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x86: amd_iommu: Convert amd_iommu_detect() to use iommu_init hook 

This changes amd_iommu_detect() to set amd_iommu_init to
iommu_init hook if amd_iommu_detect() finds the AMD IOMMU.

We can kill the code to check if we found the IOMMU in
amd_iommu_init() since amd_iommu_detect() sets amd_iommu_init()
only when it found the IOMMU.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: chrisw@sous-sol.org
Cc: dwmw2@infradead.org
Cc: joerg.roedel@amd.com
Cc: muli@il.ibm.com
LKML-Reference: <1257849980-22640-5-git-send-email-fujita.tomonori@lab.ntt.co.jp>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori 2009-11-10 19:46:15 +09:00 committed by Ingo Molnar
parent de957628ce
commit ea1b0d3945
3 changed files with 3 additions and 18 deletions
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2
arch/x86/include/asm/amd_iommu.h
View File

@ -23,7 +23,6 @@
#include <linux/irqreturn.h>
#ifdef CONFIG_AMD_IOMMU
extern int amd_iommu_init(void);
extern int amd_iommu_init_dma_ops(void);
extern int amd_iommu_init_passthrough(void);
extern void amd_iommu_detect(void);
@ -32,7 +31,6 @@ extern void amd_iommu_flush_all_domains(void);
extern void amd_iommu_flush_all_devices(void);
extern void amd_iommu_apply_erratum_63(u16 devid);
#else
static inline int amd_iommu_init(void) { return -ENODEV; }
static inline void amd_iommu_detect(void) { }
#endif

17
arch/x86/kernel/amd_iommu_init.c
View File

@ -29,6 +29,7 @@
#include <asm/amd_iommu.h>
#include <asm/iommu.h>
#include <asm/gart.h>
#include <asm/x86_init.h>
/*
* definitions for the ACPI scanning code
@ -1176,19 +1177,10 @@ static struct sys_device device_amd_iommu = {
* functions. Finally it prints some information about AMD IOMMUs and
* the driver state and enables the hardware.
*/
int __init amd_iommu_init(void)
static int __init amd_iommu_init(void)
{
int i, ret = 0;
if (no_iommu) {
printk(KERN_INFO "AMD-Vi disabled by kernel command line\n");
return 0;
}
if (!amd_iommu_detected)
return -ENODEV;
/*
* First parse ACPI tables to find the largest Bus/Dev/Func
* we need to handle. Upon this information the shared data
@ -1344,10 +1336,7 @@ void __init amd_iommu_detect(void)
if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
iommu_detected = 1;
amd_iommu_detected = 1;
#ifdef CONFIG_GART_IOMMU
gart_iommu_aperture_disabled = 1;
gart_iommu_aperture = 0;
#endif
x86_init.iommu.iommu_init = amd_iommu_init;
}
}

2
arch/x86/kernel/pci-dma.c
View File

@ -296,8 +296,6 @@ static int __init pci_iommu_init(void)
intel_iommu_init();
amd_iommu_init();
no_iommu_init();
return 0;
}