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x86/amd-iommu: Make np-cache a global flag 

The non-present cache flag was IOMMU local until now which
doesn't make sense. Make this a global flag so we can remove
the lase user of 'struct iommu' in the map/unmap path.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-11-23 18:32:38 +01:00
parent 09b4280439
commit 318afd41d2
3 changed files with 10 additions and 7 deletions
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3
arch/x86/include/asm/amd_iommu_types.h
View File

@ -211,6 +211,9 @@ extern bool amd_iommu_dump;
printk(KERN_INFO "AMD-Vi: " format, ## arg); \
} while(0);
/* global flag if IOMMUs cache non-present entries */
extern bool amd_iommu_np_cache;
/*
* Make iterating over all IOMMUs easier
*/

8
arch/x86/kernel/amd_iommu.c
View File

@ -131,12 +131,6 @@ static void amd_iommu_stats_init(void)
#endif
/* returns !0 if the IOMMU is caching non-present entries in its TLB */
static int iommu_has_npcache(struct amd_iommu *iommu)
{
return iommu->cap & (1UL << IOMMU_CAP_NPCACHE);
}
/****************************************************************************
*
* Interrupt handling functions
@ -1713,7 +1707,7 @@ retry:
if (unlikely(dma_dom->need_flush && !amd_iommu_unmap_flush)) {
iommu_flush_tlb(&dma_dom->domain);
dma_dom->need_flush = false;
} else if (unlikely(iommu_has_npcache(iommu)))
} else if (unlikely(amd_iommu_np_cache))
iommu_flush_pages(&dma_dom->domain, address, size);
out:

6
arch/x86/kernel/amd_iommu_init.c
View File

@ -141,6 +141,9 @@ LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
struct amd_iommu *amd_iommus[MAX_IOMMUS];
int amd_iommus_present;
/* IOMMUs have a non-present cache? */
bool amd_iommu_np_cache __read_mostly;
/*
* List of protection domains - used during resume
*/
@ -891,6 +894,9 @@ static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
init_iommu_from_acpi(iommu, h);
init_iommu_devices(iommu);
if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
amd_iommu_np_cache = true;
return pci_enable_device(iommu->dev);
}