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authorPaul Mundt <lethal@linux-sh.org>2008-12-10 18:06:36 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-12-22 18:44:03 +0900
commita99d6fde69dd9c73ac0b4e42a77ed1ebc714e56a (patch)
tree96d0136b37139a696265b7218e7037ce09a19873
parent4d1f3bbec49a080cae753aaa44dc1fc7277b3e50 (diff)
sh: Convert sh64 /proc/asids to debugfs and generic sh.
This converts the sh64 /proc/asids entry to debugfs and enables it for all SH parts that have debugfs enabled. On MMU systems this can be used to determine which processes are using which ASIDs which in turn can be used for finer grained cache tag analysis. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
-rw-r--r--arch/sh/Kconfig.debug4
-rw-r--r--arch/sh/kernel/process_64.c39
-rw-r--r--arch/sh/mm/Makefile_321
-rw-r--r--arch/sh/mm/Makefile_641
-rw-r--r--arch/sh/mm/asids-debugfs.c79
5 files changed, 81 insertions, 43 deletions
diff --git a/arch/sh/Kconfig.debug b/arch/sh/Kconfig.debug
index e6d2c8b11ab..8f0c1fbd51a 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 e9bf2548d6d..a7e5f2e74ba 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 f066e76da20..cb2f3f29959 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 9481d0f54ef..2863ffb7006 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 00000000000..0678a1044a9
--- /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");