diff options
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 3011ea7a3f82..f98f70626bc6 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -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: |