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Subject[PATCH -v2 3/9] GART: convert gart_iommu_hole_init to use iommu_init hook
Date
This changes gart_iommu_hole_init() to set gart_iommu_init() to
iommu_init hook if gart_iommu_hole_init() finds the GART IOMMU.

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

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---
arch/x86/include/asm/gart.h | 5 +----
arch/x86/kernel/aperture_64.c | 2 ++
arch/x86/kernel/pci-dma.c | 2 --
arch/x86/kernel/pci-gart_64.c | 15 +++++----------
4 files changed, 8 insertions(+), 16 deletions(-)
diff --git a/arch/x86/include/asm/gart.h b/arch/x86/include/asm/gart.h
index 4fdd5b3..4ac5b0f 100644
--- a/arch/x86/include/asm/gart.h
+++ b/arch/x86/include/asm/gart.h
@@ -35,7 +35,7 @@ extern int gart_iommu_aperture_allowed;
extern int gart_iommu_aperture_disabled;

extern void early_gart_iommu_check(void);
-extern void gart_iommu_init(void);
+extern int gart_iommu_init(void);
extern void __init gart_parse_options(char *);
extern void gart_iommu_hole_init(void);

@@ -47,9 +47,6 @@ extern void gart_iommu_hole_init(void);
static inline void early_gart_iommu_check(void)
{
}
-static inline void gart_iommu_init(void)
-{
-}
static inline void gart_parse_options(char *options)
{
}
diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
index 128111d..03933cf 100644
--- a/arch/x86/kernel/aperture_64.c
+++ b/arch/x86/kernel/aperture_64.c
@@ -28,6 +28,7 @@
#include <asm/pci-direct.h>
#include <asm/dma.h>
#include <asm/k8.h>
+#include <asm/x86_init.h>

int gart_iommu_aperture;
int gart_iommu_aperture_disabled __initdata;
@@ -400,6 +401,7 @@ void __init gart_iommu_hole_init(void)

iommu_detected = 1;
gart_iommu_aperture = 1;
+ x86_init.iommu.iommu_init = gart_iommu_init;

aper_order = (read_pci_config(bus, slot, 3, AMD64_GARTAPERTURECTL) >> 1) & 7;
aper_size = (32 * 1024 * 1024) << aper_order;
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 0224da8..ecde854 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -298,8 +298,6 @@ static int __init pci_iommu_init(void)

amd_iommu_init();

- gart_iommu_init();
-
no_iommu_init();
return 0;
}
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index eb46ab3..0410bd3 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -709,7 +709,7 @@ static void gart_iommu_shutdown(void)
}
}

-void __init gart_iommu_init(void)
+int __init gart_iommu_init(void)
{
struct agp_kern_info info;
unsigned long iommu_start;
@@ -719,7 +719,7 @@ void __init gart_iommu_init(void)
long i;

if (cache_k8_northbridges() < 0 || num_k8_northbridges == 0)
- return;
+ return 0;

#ifndef CONFIG_AGP_AMD64
no_agp = 1;
@@ -731,13 +731,6 @@ void __init gart_iommu_init(void)
(agp_copy_info(agp_bridge, &info) < 0);
#endif

- if (swiotlb)
- return;
-
- /* Did we detect a different HW IOMMU? */
- if (iommu_detected && !gart_iommu_aperture)
- return;
-
if (no_iommu ||
(!force_iommu && max_pfn <= MAX_DMA32_PFN) ||
!gart_iommu_aperture ||
@@ -747,7 +740,7 @@ void __init gart_iommu_init(void)
"but GART IOMMU not available.\n");
printk(KERN_WARNING "falling back to iommu=soft.\n");
}
- return;
+ return 0;
}

/* need to map that range */
@@ -840,6 +833,8 @@ void __init gart_iommu_init(void)
flush_gart();
dma_ops = &gart_dma_ops;
x86_platform.iommu_shutdown = gart_iommu_shutdown;
+
+ return 0;
}

void __init gart_parse_options(char *p)
--
1.5.6.5


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