From 691602aab9c3cce31d3ff9529c09b7922a5f6224 Mon Sep 17 00:00:00 2001 From: Alexey Kardashevskiy Date: Wed, 13 Jan 2021 21:20:14 +1100 Subject: [PATCH] powerpc/iommu/debug: Add debugfs entries for IOMMU tables This adds a folder per LIOBN under /sys/kernel/debug/iommu with IOMMU table parameters. This is enabled by CONFIG_IOMMU_DEBUGFS. Signed-off-by: Alexey Kardashevskiy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20210113102014.124452-1-aik@ozlabs.ru --- arch/powerpc/kernel/iommu.c | 46 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c index 5b69a6a72a0e..c00214a4355c 100644 --- a/arch/powerpc/kernel/iommu.c +++ b/arch/powerpc/kernel/iommu.c @@ -25,6 +25,7 @@ #include #include #include +#include #include #include #include @@ -38,6 +39,47 @@ #define DBG(...) +#ifdef CONFIG_IOMMU_DEBUGFS +static int iommu_debugfs_weight_get(void *data, u64 *val) +{ + struct iommu_table *tbl = data; + *val = bitmap_weight(tbl->it_map, tbl->it_size); + return 0; +} +DEFINE_DEBUGFS_ATTRIBUTE(iommu_debugfs_fops_weight, iommu_debugfs_weight_get, NULL, "%llu\n"); + +static void iommu_debugfs_add(struct iommu_table *tbl) +{ + char name[10]; + struct dentry *liobn_entry; + + sprintf(name, "%08lx", tbl->it_index); + liobn_entry = debugfs_create_dir(name, iommu_debugfs_dir); + + debugfs_create_file_unsafe("weight", 0400, liobn_entry, tbl, &iommu_debugfs_fops_weight); + debugfs_create_ulong("it_size", 0400, liobn_entry, &tbl->it_size); + debugfs_create_ulong("it_page_shift", 0400, liobn_entry, &tbl->it_page_shift); + debugfs_create_ulong("it_reserved_start", 0400, liobn_entry, &tbl->it_reserved_start); + debugfs_create_ulong("it_reserved_end", 0400, liobn_entry, &tbl->it_reserved_end); + debugfs_create_ulong("it_indirect_levels", 0400, liobn_entry, &tbl->it_indirect_levels); + debugfs_create_ulong("it_level_size", 0400, liobn_entry, &tbl->it_level_size); +} + +static void iommu_debugfs_del(struct iommu_table *tbl) +{ + char name[10]; + struct dentry *liobn_entry; + + sprintf(name, "%08lx", tbl->it_index); + liobn_entry = debugfs_lookup(name, iommu_debugfs_dir); + if (liobn_entry) + debugfs_remove(liobn_entry); +} +#else +static void iommu_debugfs_add(struct iommu_table *tbl){} +static void iommu_debugfs_del(struct iommu_table *tbl){} +#endif + static int novmerge; static void __iommu_free(struct iommu_table *, dma_addr_t, unsigned int); @@ -725,6 +767,8 @@ struct iommu_table *iommu_init_table(struct iommu_table *tbl, int nid, welcomed = 1; } + iommu_debugfs_add(tbl); + return tbl; } @@ -744,6 +788,8 @@ static void iommu_table_free(struct kref *kref) return; } + iommu_debugfs_del(tbl); + iommu_table_release_pages(tbl); /* verify that table contains no entries */ -- 2.11.0