sh: tlb debugfs support.
Export the status of the utlb and itlb entries through debugfs.
Signed-off-by: Matt Fleming <matt@console-pimps.org>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/arch/sh/mm/tlb-debugfs.c b/arch/sh/mm/tlb-debugfs.c
new file mode 100644
index 0000000..229bf75
--- /dev/null
+++ b/arch/sh/mm/tlb-debugfs.c
@@ -0,0 +1,179 @@
+/*
+ * arch/sh/mm/tlb-debugfs.c
+ *
+ * debugfs ops for SH-4 ITLB/UTLBs.
+ *
+ * Copyright (C) 2010 Matt Fleming
+ *
+ * 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 <asm/processor.h>
+#include <asm/mmu_context.h>
+#include <asm/tlbflush.h>
+
+enum tlb_type {
+ TLB_TYPE_ITLB,
+ TLB_TYPE_UTLB,
+};
+
+static struct {
+ int bits;
+ const char *size;
+} tlb_sizes[] = {
+ { 0x0, " 1KB" },
+ { 0x1, " 4KB" },
+ { 0x2, " 8KB" },
+ { 0x4, " 64KB" },
+ { 0x5, "256KB" },
+ { 0x7, " 1MB" },
+ { 0x8, " 4MB" },
+ { 0xc, " 64MB" },
+};
+
+static int tlb_seq_show(struct seq_file *file, void *iter)
+{
+ unsigned int tlb_type = (unsigned int)file->private;
+ unsigned long addr1, addr2, data1, data2;
+ unsigned long flags;
+ unsigned long mmucr;
+ unsigned int nentries, entry;
+ unsigned int urb;
+
+ mmucr = __raw_readl(MMUCR);
+ if ((mmucr & 0x1) == 0) {
+ seq_printf(file, "address translation disabled\n");
+ return 0;
+ }
+
+ if (tlb_type == TLB_TYPE_ITLB) {
+ addr1 = MMU_ITLB_ADDRESS_ARRAY;
+ addr2 = MMU_ITLB_ADDRESS_ARRAY2;
+ data1 = MMU_ITLB_DATA_ARRAY;
+ data2 = MMU_ITLB_DATA_ARRAY2;
+ nentries = 4;
+ } else {
+ addr1 = MMU_UTLB_ADDRESS_ARRAY;
+ addr2 = MMU_UTLB_ADDRESS_ARRAY2;
+ data1 = MMU_UTLB_DATA_ARRAY;
+ data2 = MMU_UTLB_DATA_ARRAY2;
+ nentries = 64;
+ }
+
+ local_irq_save(flags);
+ jump_to_uncached();
+
+ urb = (mmucr & MMUCR_URB) >> MMUCR_URB_SHIFT;
+
+ /* Make the "entry >= urb" test fail. */
+ if (urb == 0)
+ urb = MMUCR_URB_NENTRIES + 1;
+
+ if (tlb_type == TLB_TYPE_ITLB) {
+ addr1 = MMU_ITLB_ADDRESS_ARRAY;
+ addr2 = MMU_ITLB_ADDRESS_ARRAY2;
+ data1 = MMU_ITLB_DATA_ARRAY;
+ data2 = MMU_ITLB_DATA_ARRAY2;
+ nentries = 4;
+ } else {
+ addr1 = MMU_UTLB_ADDRESS_ARRAY;
+ addr2 = MMU_UTLB_ADDRESS_ARRAY2;
+ data1 = MMU_UTLB_DATA_ARRAY;
+ data2 = MMU_UTLB_DATA_ARRAY2;
+ nentries = 64;
+ }
+
+ seq_printf(file, "entry: vpn ppn asid size valid wired\n");
+
+ for (entry = 0; entry < nentries; entry++) {
+ unsigned long vpn, ppn, asid, size;
+ unsigned long valid;
+ unsigned long val;
+ const char *sz = " ?";
+ int i;
+
+ val = __raw_readl(addr1 | (entry << MMU_TLB_ENTRY_SHIFT));
+ ctrl_barrier();
+ vpn = val & 0xfffffc00;
+ valid = val & 0x100;
+
+ val = __raw_readl(addr2 | (entry << MMU_TLB_ENTRY_SHIFT));
+ ctrl_barrier();
+ asid = val & MMU_CONTEXT_ASID_MASK;
+
+ val = __raw_readl(data1 | (entry << MMU_TLB_ENTRY_SHIFT));
+ ctrl_barrier();
+ ppn = (val & 0x0ffffc00) << 4;
+
+ val = __raw_readl(data2 | (entry << MMU_TLB_ENTRY_SHIFT));
+ ctrl_barrier();
+ size = (val & 0xf0) >> 4;
+
+ for (i = 0; i < ARRAY_SIZE(tlb_sizes); i++) {
+ if (tlb_sizes[i].bits == size)
+ break;
+ }
+
+ if (i != ARRAY_SIZE(tlb_sizes))
+ sz = tlb_sizes[i].size;
+
+ seq_printf(file, "%2d: 0x%08lx 0x%08lx %5lu %s %s %s\n",
+ entry, vpn, ppn, asid,
+ sz, valid ? "V" : "-",
+ (urb <= entry) ? "W" : "-");
+ }
+
+ back_to_cached();
+ local_irq_restore(flags);
+
+ return 0;
+}
+
+static int tlb_debugfs_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, tlb_seq_show, inode->i_private);
+}
+
+static const struct file_operations tlb_debugfs_fops = {
+ .owner = THIS_MODULE,
+ .open = tlb_debugfs_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init tlb_debugfs_init(void)
+{
+ struct dentry *itlb, *utlb;
+
+ itlb = debugfs_create_file("itlb", S_IRUSR, sh_debugfs_root,
+ (unsigned int *)TLB_TYPE_ITLB,
+ &tlb_debugfs_fops);
+ if (unlikely(!itlb))
+ return -ENOMEM;
+ if (IS_ERR(itlb))
+ return PTR_ERR(itlb);
+
+ utlb = debugfs_create_file("utlb", S_IRUSR, sh_debugfs_root,
+ (unsigned int *)TLB_TYPE_UTLB,
+ &tlb_debugfs_fops);
+ if (unlikely(!utlb)) {
+ debugfs_remove(itlb);
+ return -ENOMEM;
+ }
+
+ if (IS_ERR(utlb)) {
+ debugfs_remove(itlb);
+ return PTR_ERR(utlb);
+ }
+
+ return 0;
+}
+module_init(tlb_debugfs_init);
+
+MODULE_LICENSE("GPL v2");