5 files changed, 81 insertions, 43 deletions

diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index e6d2c8b11abd..8f0c1fbd51a6 100644
--- a/arch/sh/Kconfig.debug
+++ b/arch/sh/Kconfig.debug
@@ -180,10 +180,6 @@ endmenu
 
 if SUPERH64
 
-config SH64_PROC_ASIDS
-        bool "Debug: report ASIDs through /proc/asids"
-        depends on PROC_FS && MMU
-
 config SH64_SR_WATCH
         bool "Debug: set SR.WATCH to enable hardware watchpoints and trace"
 
diff --git a/arch/sh/kernel/process_64.c b/arch/sh/kernel/process_64.c
index e9bf2548d6d4..a7e5f2e74bac 100644
--- a/arch/sh/kernel/process_64.c
+++ b/arch/sh/kernel/process_64.c
@@ -23,7 +23,6 @@
 #include <linux/reboot.h>
 #include <linux/init.h>
 #include <linux/module.h>
-#include <linux/proc_fs.h>
 #include <linux/io.h>
 #include <asm/syscalls.h>
 #include <asm/uaccess.h>
@@ -590,41 +589,3 @@ unsigned long get_wchan(struct task_struct *p)
 #endif
         return pc;
 }
-
-/* Provide a /proc/asids file that lists out the
-   ASIDs currently associated with the processes.  (If the DM.PC register is
-   examined through the debug link, this shows ASID + PC.  To make use of this,
-   the PID->ASID relationship needs to be known.  This is primarily for
-   debugging.)
-   */
-
-#if defined(CONFIG_SH64_PROC_ASIDS)
-static int
-asids_proc_info(char *buf, char **start, off_t fpos, int length, int *eof, void *data)
-{
-        int len=0;
-        struct task_struct *p;
-        read_lock(&tasklist_lock);
-        for_each_process(p) {
-                int pid = p->pid;
-
-                if (!pid)
-                        continue;
-                if (p->mm)
-                        len += sprintf(buf+len, "%5d : %02lx\n", pid,
-                                       asid_cache(smp_processor_id()));
-                else
-                        len += sprintf(buf+len, "%5d : (none)\n", pid);
-        }
-        read_unlock(&tasklist_lock);
-        *eof = 1;
-        return len;
-}
-
-static int __init register_proc_asids(void)
-{
-        create_proc_read_entry("asids", 0, NULL, asids_proc_info, NULL);
-        return 0;
-}
-__initcall(register_proc_asids);
-#endif
diff --git a/arch/sh/mm/Makefile_32 b/arch/sh/mm/Makefile_32
index f066e76da204..cb2f3f299591 100644
--- a/arch/sh/mm/Makefile_32
+++ b/arch/sh/mm/Makefile_32
@@ -18,6 +18,7 @@ mmu-y			:= tlb-nommu.o pg-nommu.o
 mmu-$(CONFIG_MMU)       := fault_32.o tlbflush_32.o ioremap_32.o
 
 obj-y                   += $(mmu-y)
+obj-$(CONFIG_DEBUG_FS)  += asids-debugfs.o
 
 ifdef CONFIG_DEBUG_FS
 obj-$(CONFIG_CPU_SH4)   += cache-debugfs.o
diff --git a/arch/sh/mm/Makefile_64 b/arch/sh/mm/Makefile_64
index 9481d0f54efd..2863ffb7006d 100644
--- a/arch/sh/mm/Makefile_64
+++ b/arch/sh/mm/Makefile_64
@@ -13,6 +13,7 @@ obj-y			+= cache-sh5.o
 endif
 
 obj-y                   += $(mmu-y)
+obj-$(CONFIG_DEBUG_FS)  += asids-debugfs.o
 
 obj-$(CONFIG_HUGETLB_PAGE)      += hugetlbpage.o
 obj-$(CONFIG_NUMA)              += numa.o
diff --git a/arch/sh/mm/asids-debugfs.c b/arch/sh/mm/asids-debugfs.c
new file mode 100644
index 000000000000..0678a1044a9a
--- /dev/null
+++ b/arch/sh/mm/asids-debugfs.c
@@ -0,0 +1,79 @@
+/*
+ * debugfs ops for process ASIDs
+ *
+ *  Copyright (C) 2000, 2001  Paolo Alberelli
+ *  Copyright (C) 2003 - 2008  Paul Mundt
+ *  Copyright (C) 2003, 2004  Richard Curnow
+ *
+ * Provides a debugfs file that lists out the ASIDs currently associated
+ * with the processes.
+ *
+ * In the SH-5 case, if the DM.PC register is examined through the debug
+ * link, this shows ASID + PC. To make use of this, the PID->ASID
+ * relationship needs to be known. This is primarily for debugging.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+#include <linux/spinlock.h>
+#include <asm/processor.h>
+#include <asm/mmu_context.h>
+
+static int asids_seq_show(struct seq_file *file, void *iter)
+{
+        struct task_struct *p;
+
+        read_lock(&tasklist_lock);
+
+        for_each_process(p) {
+                int pid = p->pid;
+
+                if (unlikely(!pid))
+                        continue;
+
+                if (p->mm)
+                        seq_printf(file, "%5d : %02x\n", pid,
+                                   cpu_asid(smp_processor_id(), p->mm));
+                else
+                        seq_printf(file, "%5d : (none)\n", pid);
+        }
+
+        read_unlock(&tasklist_lock);
+
+        return 0;
+}
+
+static int asids_debugfs_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, asids_seq_show, inode->i_private);
+}
+
+static const struct file_operations asids_debugfs_fops = {
+        .owner          = THIS_MODULE,
+        .open           = asids_debugfs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
+static int __init asids_debugfs_init(void)
+{
+        struct dentry *asids_dentry;
+
+        asids_dentry = debugfs_create_file("asids", S_IRUSR, sh_debugfs_root,
+                                           NULL, &asids_debugfs_fops);
+        if (!asids_dentry)
+                return -ENOMEM;
+        if (IS_ERR(asids_dentry))
+                return PTR_ERR(asids_dentry);
+
+        return 0;
+}
+module_init(asids_debugfs_init);
+
+MODULE_LICENSE("GPL v2");