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AMD IOMMU: add init code for statistic collection

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Impact: create a new debugfs directory

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-12 13:50:21 +01:00
parent a9dddbe049
commit 7f26508bbb
2 changed files with 39 additions and 0 deletions
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2
arch/x86/include/asm/amd_iommu_types.h
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@ -420,6 +420,8 @@ struct __iommu_counter {
#define ADD_STATS_COUNTER(name, x)
#define SUB_STATS_COUNTER(name, x)
static inline void amd_iommu_stats_init(void) { }
#endif /* CONFIG_AMD_IOMMU_STATS */
#endif /* _ASM_X86_AMD_IOMMU_TYPES_H */

37
arch/x86/kernel/amd_iommu.c
View file

@ -20,6 +20,7 @@
#include <linux/pci.h>
#include <linux/gfp.h>
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/scatterlist.h>
#include <linux/iommu-helper.h>
#ifdef CONFIG_IOMMU_API
@ -57,6 +58,40 @@ static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
static struct dma_ops_domain *find_protection_domain(u16 devid);
#ifdef CONFIG_AMD_IOMMU_STATS
/*
* Initialization code for statistics collection
*/
static struct dentry *stats_dir;
static struct dentry *de_isolate;
static struct dentry *de_fflush;
static void amd_iommu_stats_add(struct __iommu_counter *cnt)
{
if (stats_dir == NULL)
return;
cnt->dent = debugfs_create_u64(cnt->name, 0444, stats_dir,
&cnt->value);
}
static void amd_iommu_stats_init(void)
{
stats_dir = debugfs_create_dir("amd-iommu", NULL);
if (stats_dir == NULL)
return;
de_isolate = debugfs_create_bool("isolation", 0444, stats_dir,
(u32 *)&amd_iommu_isolate);
de_fflush = debugfs_create_bool("fullflush", 0444, stats_dir,
(u32 *)&amd_iommu_unmap_flush);
}
#endif
/* returns !0 if the IOMMU is caching non-present entries in its TLB */
static int iommu_has_npcache(struct amd_iommu *iommu)
{
@ -1620,6 +1655,8 @@ int __init amd_iommu_init_dma_ops(void)
bus_register_notifier(&pci_bus_type, &device_nb);
amd_iommu_stats_init();
return 0;
free_domains: