diff options
author | venkatesh.pallipadi@intel.com <venkatesh.pallipadi@intel.com> | 2008-07-19 03:08:14 +0400 |
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committer | H. Peter Anvin <hpa@zytor.com> | 2008-07-19 04:22:05 +0400 |
commit | fec0962e0bed407927b9ff54bb0596a3ab7e4b61 (patch) | |
tree | ca63a7abf2a02871ee12d395f9ce0d457132cc6a /arch/x86/mm | |
parent | ae79cdaacb5599781f8bb49f4bdd5723029669cf (diff) | |
download | linux-fec0962e0bed407927b9ff54bb0596a3ab7e4b61.tar.xz |
x86: Add a debugfs interface to dump PAT memtype
Add a debugfs interface to list out all the PAT memtype reservations.
Appears at debugfs x86/pat_memtype_list and output format is
type @ <start addr>-<end addr>
We do not hold the lock while printing the entire list. So, the list may not be
a consistent copy in case where regions are getting added or deleted
at the same time.
Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r-- | arch/x86/mm/pat.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index d4585077977a..0917a540a55e 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> @@ -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 */ |