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

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.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent ced3ce76

arch/x86/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -496,6 +496,19 @@ config IOSF_MBI 


	  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

	bool "RDC R-321x SoC"

	depends on X86_32

arch/x86/kernel/iosf_mbi.c

+19 −4
Original line number Diff line number Diff line
@@ -190,7 +190,7 @@ bool iosf_mbi_available(void) 
}

EXPORT_SYMBOL(iosf_mbi_available);



/********************** debugfs begin ****************************/

#ifdef CONFIG_IOSF_MBI_DEBUG

static u32	dbg_mdr;

static u32	dbg_mcr;

static u32	dbg_mcrx;
@@ -229,6 +229,7 @@ static int mcr_set(void *data, u64 val) 
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;
@@ -257,7 +258,20 @@ static void iosf_sideband_debug_init(void) 
cleanup:

	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,

			  const struct pci_device_id *unused)
@@ -290,13 +304,14 @@ static struct pci_driver iosf_mbi_pci_driver = { 


static int __init iosf_mbi_init(void)

{

	iosf_sideband_debug_init();

	iosf_debugfs_init();



	return pci_register_driver(&iosf_mbi_pci_driver);

}



static void __exit iosf_mbi_exit(void)

{

	debugfs_remove_recursive(iosf_dbg);

	iosf_debugfs_remove();



	pci_unregister_driver(&iosf_mbi_pci_driver);

	if (mbi_pdev) {