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Commit f644e368 authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: mm: retire ARC_DBG_TLB_MISS_COUNT... 



... given that we have perf counters abel to do the same thing non
intrusively

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent c3005475

arch/arc/Kconfig

+0 −8
Original line number Diff line number Diff line
@@ -540,14 +540,6 @@ config ARC_DBG_TLB_PARANOIA 
	bool "Paranoia Checks in Low Level TLB Handlers"

	default n



config ARC_DBG_TLB_MISS_COUNT

	bool "Profile TLB Misses"

	default n

	select DEBUG_FS

	help

	  Counts number of I and D TLB Misses and exports them via Debugfs

	  The counters can be cleared via Debugfs as well



endif



config ARC_UBOOT_SUPPORT

arch/arc/kernel/troubleshoot.c

+0 −110
Original line number Diff line number Diff line
@@ -237,113 +237,3 @@ void show_kernel_fault_diag(const char *str, struct pt_regs *regs, 
	if (!user_mode(regs))

		show_stacktrace(current, regs);

}
 


#ifdef CONFIG_DEBUG_FS



#include <linux/module.h>

#include <linux/fs.h>

#include <linux/mount.h>

#include <linux/pagemap.h>

#include <linux/init.h>

#include <linux/namei.h>

#include <linux/debugfs.h>



static struct dentry *test_dentry;

static struct dentry *test_dir;

static struct dentry *test_u32_dentry;



static u32 clr_on_read = 1;



#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT

u32 numitlb, numdtlb, num_pte_not_present;



static int fill_display_data(char *kbuf)

{

	size_t num = 0;

	num += sprintf(kbuf + num, "I-TLB Miss %x\n", numitlb);

	num += sprintf(kbuf + num, "D-TLB Miss %x\n", numdtlb);

	num += sprintf(kbuf + num, "PTE not present %x\n", num_pte_not_present);



	if (clr_on_read)

		numitlb = numdtlb = num_pte_not_present = 0;



	return num;

}



static int tlb_stats_open(struct inode *inode, struct file *file)

{

	file->private_data = (void *)__get_free_page(GFP_KERNEL);

	return 0;

}



/* called on user read(): display the counters */

static ssize_t tlb_stats_output(struct file *file,	/* file descriptor */

				char __user *user_buf,	/* user buffer */

				size_t len,		/* length of buffer */

				loff_t *offset)		/* offset in the file */

{

	size_t num;

	char *kbuf = (char *)file->private_data;



	/* All of the data can he shoved in one iteration */

	if (*offset != 0)

		return 0;



	num = fill_display_data(kbuf);



	/* simple_read_from_buffer() is helper for copy to user space

	   It copies up to @2 (num) bytes from kernel buffer @4 (kbuf) at offset

	   @3 (offset) into the user space address starting at @1 (user_buf).

	   @5 (len) is max size of user buffer

	 */

	return simple_read_from_buffer(user_buf, num, offset, kbuf, len);

}



/* called on user write : clears the counters */

static ssize_t tlb_stats_clear(struct file *file, const char __user *user_buf,

			       size_t length, loff_t *offset)

{

	numitlb = numdtlb = num_pte_not_present = 0;

	return length;

}



static int tlb_stats_close(struct inode *inode, struct file *file)

{

	free_page((unsigned long)(file->private_data));

	return 0;

}



static const struct file_operations tlb_stats_file_ops = {

	.read = tlb_stats_output,

	.write = tlb_stats_clear,

	.open = tlb_stats_open,

	.release = tlb_stats_close

};

#endif



static int __init arc_debugfs_init(void)

{

	test_dir = debugfs_create_dir("arc", NULL);



#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT

	test_dentry = debugfs_create_file("tlb_stats", 0444, test_dir, NULL,

					  &tlb_stats_file_ops);

#endif



	test_u32_dentry =

	    debugfs_create_u32("clr_on_read", 0444, test_dir, &clr_on_read);



	return 0;

}



module_init(arc_debugfs_init);



static void __exit arc_debugfs_exit(void)

{

	debugfs_remove(test_u32_dentry);

	debugfs_remove(test_dentry);

	debugfs_remove(test_dir);

}

module_exit(arc_debugfs_exit);



#endif

arch/arc/mm/tlbex.S

+0 −21
Original line number Diff line number Diff line
@@ -237,15 +237,6 @@ ex_saved_reg1: 


2:



#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT

	and.f 0, r0, _PAGE_PRESENT

	bz   1f

	ld   r3, [num_pte_not_present]

	add  r3, r3, 1

	st   r3, [num_pte_not_present]

1:

#endif



.endm



;-----------------------------------------------------------------
@@ -309,12 +300,6 @@ ENTRY(EV_TLBMissI) 


	TLBMISS_FREEUP_REGS



#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT

	ld  r0, [@numitlb]

	add r0, r0, 1

	st  r0, [@numitlb]

#endif



	;----------------------------------------------------------------

	; Get the PTE corresponding to V-addr accessed, r2 is setup with EFA

	LOAD_FAULT_PTE
@@ -349,12 +334,6 @@ ENTRY(EV_TLBMissD) 


	TLBMISS_FREEUP_REGS



#ifdef CONFIG_ARC_DBG_TLB_MISS_COUNT

	ld  r0, [@numdtlb]

	add r0, r0, 1

	st  r0, [@numdtlb]

#endif



	;----------------------------------------------------------------

	; Get the PTE corresponding to V-addr accessed

	; If PTE exists, it will setup, r0 = PTE, r1 = Ptr to PTE, r2 = EFA