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

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 5b69a6a72a0e21d64854ff25699e9ff53a3859bc..c00214a4355c80490bf4347f0bd2f7b2da082f0f 100644 (file)
--- 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 */