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x86/iosf: Add debugfs support

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Allows access to the iosf sideband through debugfs.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: http://lkml.kernel.org/r/1409175640-32426-3-git-send-email-david.e.box@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
David E. Box 2014-08-27 14:40:40 -07:00 committed by H. Peter Anvin
parent aa8e4f22ab
commit 8dc12f933c
1 changed files with 74 additions and 0 deletions
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74
arch/x86/kernel/iosf_mbi.c
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@ -22,6 +22,8 @@
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/pci.h>
#include <linux/debugfs.h>
#include <linux/capability.h>
#include <asm/iosf_mbi.h>
@ -187,6 +189,75 @@ bool iosf_mbi_available(void)
}
EXPORT_SYMBOL(iosf_mbi_available);
/********************** debugfs begin ****************************/
static u32 dbg_mdr;
static u32 dbg_mcr;
static u32 dbg_mcrx;
static int mcr_get(void *data, u64 *val)
{
*val = *(u32 *)data;
return 0;
}
static int mcr_set(void *data, u64 val)
{
u8 command = ((u32)val & 0xFF000000) >> 24,
port = ((u32)val & 0x00FF0000) >> 16,
offset = ((u32)val & 0x0000FF00) >> 8;
int err;
*(u32 *)data = val;
if (!capable(CAP_SYS_RAWIO))
return -EACCES;
if (command & 1u)
err = iosf_mbi_write(port,
command,
dbg_mcrx | offset,
dbg_mdr);
else
err = iosf_mbi_read(port,
command,
dbg_mcrx | offset,
&dbg_mdr);
return err;
}
DEFINE_SIMPLE_ATTRIBUTE(iosf_mcr_fops, mcr_get, mcr_set , "%llx\n");
static struct dentry *iosf_dbg;
static void iosf_sideband_debug_init(void)
{
struct dentry *d;
iosf_dbg = debugfs_create_dir("iosf_sb", NULL);
if (IS_ERR_OR_NULL(iosf_dbg))
return;
/* mdr */
d = debugfs_create_x32("mdr", 0660, iosf_dbg, &dbg_mdr);
if (IS_ERR_OR_NULL(d))
goto cleanup;
/* mcrx */
debugfs_create_x32("mcrx", 0660, iosf_dbg, &dbg_mcrx);
if (IS_ERR_OR_NULL(d))
goto cleanup;
/* mcr - initiates mailbox tranaction */
debugfs_create_file("mcr", 0660, iosf_dbg, &dbg_mcr, &iosf_mcr_fops);
if (IS_ERR_OR_NULL(d))
goto cleanup;
return;
cleanup:
debugfs_remove_recursive(d);
}
/********************** debugfs end ****************************/
static int iosf_mbi_probe(struct pci_dev *pdev,
const struct pci_device_id *unused)
{
@ -217,11 +288,14 @@ static struct pci_driver iosf_mbi_pci_driver = {
static int __init iosf_mbi_init(void)
{
iosf_sideband_debug_init();
return pci_register_driver(&iosf_mbi_pci_driver);
}
static void __exit iosf_mbi_exit(void)
{
debugfs_remove_recursive(iosf_dbg);
pci_unregister_driver(&iosf_mbi_pci_driver);
if (mbi_pdev) {
pci_dev_put(mbi_pdev);