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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
This commit is contained in:
Alexey Kardashevskiy 2021-01-13 21:20:14 +11:00 committed by Michael Ellerman
parent 22f1de2e13
commit 691602aab9
1 changed files with 46 additions and 0 deletions
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46
arch/powerpc/kernel/iommu.c
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@ -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 */