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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Re: [PATCH 2/2] Introduce xen_swiotlb variable that is set when Xen is running.
On 09/24/09 16:37, Jeremy Fitzhardinge wrote:
> On 09/24/09 15:43, Konrad Rzeszutek Wilk wrote:
>
>> Having the 'xen_swiotlb' variable enabled causes all of the
>> IOMMU's to be disabled (except the Xen-SWIOTLB). It is in
>> essence a copy of what swiotlb variable does. However the swiotlb variable
>> cannot be used because it would turn on the non-Xen SWIOTLB.
>> ---
>> arch/x86/include/asm/dma-mapping.h | 1 +
>> arch/x86/include/asm/xen/swiotlb.h | 4 +++-
>> arch/x86/kernel/amd_iommu_init.c | 2 +-
>> arch/x86/kernel/aperture_64.c | 2 +-
>> arch/x86/kernel/pci-calgary_64.c | 2 +-
>> arch/x86/kernel/pci-dma.c | 4 ++--
>> arch/x86/kernel/pci-gart_64.c | 2 +-
>> arch/x86/kernel/pci-swiotlb.c | 4 ++--
>> arch/x86/xen/pci-swiotlb.c | 3 +++
>> 9 files changed, 15 insertions(+), 9 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/dma-mapping.h
>> b/arch/x86/include/asm/dma-mapping.h
>> index 1c3f943..01ef814 100644
>> --- a/arch/x86/include/asm/dma-mapping.h
>> +++ b/arch/x86/include/asm/dma-mapping.h
>> @@ -12,6 +12,7 @@
>> #include <linux/dma-attrs.h>
>> #include <asm/io.h>
>> #include <asm/swiotlb.h>
>> +#include <asm/xen/swiotlb.h>
>> #include <asm-generic/dma-coherent.h>
>>
>> extern dma_addr_t bad_dma_address;
>> diff --git a/arch/x86/include/asm/xen/swiotlb.h
>> b/arch/x86/include/asm/xen/swiotlb.h
>> index d094f89..fd7e48a 100644
>> --- a/arch/x86/include/asm/xen/swiotlb.h
>> +++ b/arch/x86/include/asm/xen/swiotlb.h
>> @@ -2,9 +2,11 @@
>> #define _ASM_X86_XEN_SWIOTLB_H
>>
>> #ifdef CONFIG_PCI_XEN
>> +extern int xen_swiotlb;
>> extern void xen_swiotlb_init(void);
>> #else
>> -static void xen_swiotlb_init(void) { }
>> +#define xen_swiotlb 0
>> +static inline void xen_swiotlb_init(void) { }
>> #endif
>>
>> #endif
>> diff --git a/arch/x86/kernel/amd_iommu_init.c
>> b/arch/x86/kernel/amd_iommu_init.c
>> index c1b17e9..78ec74b 100644
>> --- a/arch/x86/kernel/amd_iommu_init.c
>> +++ b/arch/x86/kernel/amd_iommu_init.c
>> @@ -1304,7 +1304,7 @@ static int __init early_amd_iommu_detect(struct
>> acpi_table_header *table)
>>
>> void __init amd_iommu_detect(void)
>> {
>> - if (swiotlb || no_iommu || (iommu_detected && !gart_iommu_aperture))
>> + if (swiotlb || xen_swiotlb || no_iommu || (iommu_detected &&
>> !gart_iommu_aperture))
>> return;
>>
>> if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
>> diff --git a/arch/x86/kernel/aperture_64.c b/arch/x86/kernel/aperture_64.c
>> index 676debf..6a50006 100644
>> --- a/arch/x86/kernel/aperture_64.c
>> +++ b/arch/x86/kernel/aperture_64.c
>> @@ -369,7 +369,7 @@ void __init gart_iommu_hole_init(void)
>> int fix, slot, valid_agp = 0;
>> int i, node;
>>
>> - if (gart_iommu_aperture_disabled || !fix_aperture ||
>> + if (gart_iommu_aperture_disabled || !fix_aperture || xen_swiotlb ||
>> !early_pci_allowed())
>> return;
>>
>> diff --git a/arch/x86/kernel/pci-calgary_64.c
>> b/arch/x86/kernel/pci-calgary_64.c
>> index 971a3be..f7b8e1c 100644
>> --- a/arch/x86/kernel/pci-calgary_64.c
>> +++ b/arch/x86/kernel/pci-calgary_64.c
>> @@ -1357,7 +1357,7 @@ void __init detect_calgary(void)
>> * if the user specified iommu=off or iommu=soft or we found
>> * another HW IOMMU already, bail out.
>> */
>> - if (swiotlb || no_iommu || iommu_detected)
>> + if (swiotlb || xen_swiotlb || no_iommu || iommu_detected)
>> return;
>>
>> if (!use_calgary)
>> diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
>> index 6b76948..1101a9f 100644
>> --- a/arch/x86/kernel/pci-dma.c
>> +++ b/arch/x86/kernel/pci-dma.c
>> @@ -122,6 +122,8 @@ void __init pci_iommu_alloc(void)
>> * The order of these functions is important for
>> * fall-back/fail-over reasons
>> */
>> + xen_swiotlb_init();
>> +
>> gart_iommu_hole_init();
>>
>> detect_calgary();
>> @@ -130,8 +132,6 @@ void __init pci_iommu_alloc(void)
>>
>> amd_iommu_detect();
>>
>> - xen_swiotlb_init();
>> -
>> pci_swiotlb_init();
>> }
>>
>> diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
>> index d2e56b8..f2c9f19 100644
>> --- a/arch/x86/kernel/pci-gart_64.c
>> +++ b/arch/x86/kernel/pci-gart_64.c
>> @@ -730,7 +730,7 @@ void __init gart_iommu_init(void)
>> (agp_copy_info(agp_bridge, &info) < 0);
>> #endif
>>
>> - if (swiotlb)
>> + if (swiotlb || xen_swiotlb)
>> return;
>>
>> /* Did we detect a different HW IOMMU? */
>> diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
>> index e8a3501..54a0fa9 100644
>> --- a/arch/x86/kernel/pci-swiotlb.c
>> +++ b/arch/x86/kernel/pci-swiotlb.c
>> @@ -47,10 +47,10 @@ void __init pci_swiotlb_init(void)
>> /* don't initialize swiotlb if iommu=off (no_iommu=1) */
>> #ifdef CONFIG_X86_64
>> if ((!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN) ||
>> - iommu_pass_through)
>> + iommu_pass_through || !xen_swiotlb)
>>
>>
> This doesn't apply to the xen/dom0/swiotlb-new branch.
>
OK, its against xen/master.
>> swiotlb = 1;
>> #endif
>> - if (swiotlb_force)
>> + if (swiotlb_force || !xen_swiotlb)
>>
>>
> Are you sure this is right? This will always enable swiotlb if
> !xen_swiotlb.
>
I went with this instead:
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 9640e17..e2d739e 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -45,6 +45,9 @@ static struct dma_map_ops swiotlb_dma_ops = {
void __init pci_swiotlb_init(void)
{
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
+ if (xen_swiotlb)
+ return;
+
#ifdef CONFIG_X86_64
if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
swiotlb = 1;
Does that work?
J
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