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-rw-r--r--arch/x86/mm/pat.c94
1 files changed, 91 insertions, 3 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index d4585077977..2fe30916d4b 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -12,6 +12,8 @@
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/bootmem.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
#include <asm/msr.h>
#include <asm/tlbflush.h>
@@ -373,8 +375,8 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
return vma_prot;
}
-#ifdef CONFIG_NONPROMISC_DEVMEM
-/* This check is done in drivers/char/mem.c in case of NONPROMISC_DEVMEM*/
+#ifdef CONFIG_STRICT_DEVMEM
+/* This check is done in drivers/char/mem.c in case of STRICT_DEVMEM*/
static inline int range_is_allowed(unsigned long pfn, unsigned long size)
{
return 1;
@@ -398,7 +400,7 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
}
return 1;
}
-#endif /* CONFIG_NONPROMISC_DEVMEM */
+#endif /* CONFIG_STRICT_DEVMEM */
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t *vma_prot)
@@ -489,3 +491,89 @@ void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
free_memtype(addr, addr + size);
}
+
+#if defined(CONFIG_DEBUG_FS)
+
+/* get Nth element of the linked list */
+static struct memtype *memtype_get_idx(loff_t pos)
+{
+ struct memtype *list_node, *print_entry;
+ int i = 1;
+
+ print_entry = kmalloc(sizeof(struct memtype), GFP_KERNEL);
+ if (!print_entry)
+ return NULL;
+
+ spin_lock(&memtype_lock);
+ list_for_each_entry(list_node, &memtype_list, nd) {
+ if (pos == i) {
+ *print_entry = *list_node;
+ spin_unlock(&memtype_lock);
+ return print_entry;
+ }
+ ++i;
+ }
+ spin_unlock(&memtype_lock);
+ kfree(print_entry);
+ return NULL;
+}
+
+static void *memtype_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ if (*pos == 0) {
+ ++*pos;
+ seq_printf(seq, "PAT memtype list:\n");
+ }
+
+ return memtype_get_idx(*pos);
+}
+
+static void *memtype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ return memtype_get_idx(*pos);
+}
+
+static void memtype_seq_stop(struct seq_file *seq, void *v)
+{
+}
+
+static int memtype_seq_show(struct seq_file *seq, void *v)
+{
+ struct memtype *print_entry = (struct memtype *)v;
+
+ seq_printf(seq, "%s @ 0x%Lx-0x%Lx\n", cattr_name(print_entry->type),
+ print_entry->start, print_entry->end);
+ kfree(print_entry);
+ return 0;
+}
+
+static struct seq_operations memtype_seq_ops = {
+ .start = memtype_seq_start,
+ .next = memtype_seq_next,
+ .stop = memtype_seq_stop,
+ .show = memtype_seq_show,
+};
+
+static int memtype_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &memtype_seq_ops);
+}
+
+static const struct file_operations memtype_fops = {
+ .open = memtype_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
+
+static int __init pat_memtype_list_init(void)
+{
+ debugfs_create_file("pat_memtype_list", S_IRUSR, arch_debugfs_dir,
+ NULL, &memtype_fops);
+ return 0;
+}
+
+late_initcall(pat_memtype_list_init);
+
+#endif /* CONFIG_DEBUG_FS */