Commit ed2226bd authored by David E. Box's avatar David E. Box Committed by Ingo Molnar

x86/platform/intel/iosf: Add debugfs config option for IOSF

Makes the IOSF sideband available through debugfs. Allows
developers to experiment with using the sideband to provide
debug and analytical tools for units on the SoC.
Signed-off-by: default avatarDavid E. Box <david.e.box@linux.intel.com>
Link: http://lkml.kernel.org/r/1411017231-20807-4-git-send-email-david.e.box@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ced3ce76
...@@ -496,6 +496,19 @@ config IOSF_MBI ...@@ -496,6 +496,19 @@ config IOSF_MBI
You should say Y if you are running a kernel on one of these SoC's. You should say Y if you are running a kernel on one of these SoC's.
config IOSF_MBI_DEBUG
bool "Enable IOSF sideband access through debugfs"
depends on IOSF_MBI && DEBUG_FS
---help---
Select this option to expose the IOSF sideband access registers (MCR,
MDR, MCRX) through debugfs to write and read register information from
different units on the SoC. This is most useful for obtaining device
state information for debug and analysis. As this is a general access
mechanism, users of this option would have specific knowledge of the
device they want to access.
If you don't require the option or are in doubt, say N.
config X86_RDC321X config X86_RDC321X
bool "RDC R-321x SoC" bool "RDC R-321x SoC"
depends on X86_32 depends on X86_32
......
...@@ -190,7 +190,7 @@ bool iosf_mbi_available(void) ...@@ -190,7 +190,7 @@ bool iosf_mbi_available(void)
} }
EXPORT_SYMBOL(iosf_mbi_available); EXPORT_SYMBOL(iosf_mbi_available);
/********************** debugfs begin ****************************/ #ifdef CONFIG_IOSF_MBI_DEBUG
static u32 dbg_mdr; static u32 dbg_mdr;
static u32 dbg_mcr; static u32 dbg_mcr;
static u32 dbg_mcrx; static u32 dbg_mcrx;
...@@ -229,6 +229,7 @@ static int mcr_set(void *data, u64 val) ...@@ -229,6 +229,7 @@ static int mcr_set(void *data, u64 val)
DEFINE_SIMPLE_ATTRIBUTE(iosf_mcr_fops, mcr_get, mcr_set , "%llx\n"); DEFINE_SIMPLE_ATTRIBUTE(iosf_mcr_fops, mcr_get, mcr_set , "%llx\n");
static struct dentry *iosf_dbg; static struct dentry *iosf_dbg;
static void iosf_sideband_debug_init(void) static void iosf_sideband_debug_init(void)
{ {
struct dentry *d; struct dentry *d;
...@@ -257,7 +258,20 @@ static void iosf_sideband_debug_init(void) ...@@ -257,7 +258,20 @@ static void iosf_sideband_debug_init(void)
cleanup: cleanup:
debugfs_remove_recursive(d); debugfs_remove_recursive(d);
} }
/********************** debugfs end ****************************/
static void iosf_debugfs_init(void)
{
iosf_sideband_debug_init();
}
static void iosf_debugfs_remove(void)
{
debugfs_remove_recursive(iosf_dbg);
}
#else
static inline void iosf_debugfs_init(void) { }
static inline void iosf_debugfs_remove(void) { }
#endif /* CONFIG_IOSF_MBI_DEBUG */
static int iosf_mbi_probe(struct pci_dev *pdev, static int iosf_mbi_probe(struct pci_dev *pdev,
const struct pci_device_id *unused) const struct pci_device_id *unused)
...@@ -290,13 +304,14 @@ static struct pci_driver iosf_mbi_pci_driver = { ...@@ -290,13 +304,14 @@ static struct pci_driver iosf_mbi_pci_driver = {
static int __init iosf_mbi_init(void) static int __init iosf_mbi_init(void)
{ {
iosf_sideband_debug_init(); iosf_debugfs_init();
return pci_register_driver(&iosf_mbi_pci_driver); return pci_register_driver(&iosf_mbi_pci_driver);
} }
static void __exit iosf_mbi_exit(void) static void __exit iosf_mbi_exit(void)
{ {
debugfs_remove_recursive(iosf_dbg); iosf_debugfs_remove();
pci_unregister_driver(&iosf_mbi_pci_driver); pci_unregister_driver(&iosf_mbi_pci_driver);
if (mbi_pdev) { if (mbi_pdev) {
......
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