diff options
| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2021-01-13 21:20:14 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-01-30 11:39:31 +1100 |
| commit | 691602aab9c3cce31d3ff9529c09b7922a5f6224 (patch) | |
| tree | 0ff93cb3c266f5678907056a9ced3e79b7c771f8 /arch/powerpc/kernel/iommu.c | |
| parent | 22f1de2e13b066921dedf6a00d2cc414f3cbab05 (diff) | |
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 <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210113102014.124452-1-aik@ozlabs.ru
Diffstat (limited to 'arch/powerpc/kernel/iommu.c')
| -rw-r--r-- | arch/powerpc/kernel/iommu.c | 46 |
1 files changed, 46 insertions, 0 deletions
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 <linux/pci.h> #include <linux/iommu.h> #include <linux/sched.h> +#include <linux/debugfs.h> #include <asm/io.h> #include <asm/prom.h> #include <asm/iommu.h> @@ -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 */ |