Commit 9c83e9f3 authored by Suman Anna's avatar Suman Anna Committed by Joerg Roedel
Browse files

iommu/omap: Switch pagetable debugfs entry to use seq_file 



The debugfs entry 'pagetable' that shows the page table entry
(PTE) data currently outputs only data that can be fit into a
page. Switch the entry to use the seq_file interface so that
it can show all the valid page table entries.

The patch also corrected the output for L2 entries, and prints
the proper L2 PTE instead of the previous L1 page descriptor
pointer.

Signed-off-by: default avatarSuman Anna <s-anna@ti.com>
Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent c5cf5c53

drivers/iommu/omap-iommu-debug.c

+28 −53
Original line number Diff line number Diff line
@@ -85,93 +85,68 @@ static ssize_t debug_read_tlb(struct file *file, char __user *userbuf, 
	return bytes;

}



#define dump_ioptable_entry_one(lv, da, val)			\

	({							\

		int __err = 0;					\

		ssize_t bytes;					\

		const int maxcol = 22;				\

		const char *str = "%d: %08x %08x\n";		\

		bytes = snprintf(p, maxcol, str, lv, da, val);	\

		p += bytes;					\

		len -= bytes;					\

		if (len < maxcol)				\

			__err = -ENOMEM;			\

		__err;						\

	})



static ssize_t dump_ioptable(struct omap_iommu *obj, char *buf, ssize_t len)

static void dump_ioptable(struct seq_file *s)

{

	int i;

	u32 *iopgd;

	char *p = buf;

	int i, j;

	u32 da;

	u32 *iopgd, *iopte;

	struct omap_iommu *obj = s->private;



	spin_lock(&obj->page_table_lock);



	iopgd = iopgd_offset(obj, 0);

	for (i = 0; i < PTRS_PER_IOPGD; i++, iopgd++) {

		int j, err;

		u32 *iopte;

		u32 da;



		if (!*iopgd)

			continue;



		if (!(*iopgd & IOPGD_TABLE)) {

			da = i << IOPGD_SHIFT;



			err = dump_ioptable_entry_one(1, da, *iopgd);

			if (err)

				goto out;

			seq_printf(s, "1: 0x%08x 0x%08x\n", da, *iopgd);

			continue;

		}



		iopte = iopte_offset(iopgd, 0);



		for (j = 0; j < PTRS_PER_IOPTE; j++, iopte++) {

			if (!*iopte)

				continue;



			da = (i << IOPGD_SHIFT) + (j << IOPTE_SHIFT);

			err = dump_ioptable_entry_one(2, da, *iopgd);

			if (err)

				goto out;

			seq_printf(s, "2: 0x%08x 0x%08x\n", da, *iopte);

		}

	}

out:

	spin_unlock(&obj->page_table_lock);



	return p - buf;

	spin_unlock(&obj->page_table_lock);

}



static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf,

				    size_t count, loff_t *ppos)

static int debug_read_pagetable(struct seq_file *s, void *data)

{

	struct omap_iommu *obj = file->private_data;

	char *p, *buf;

	size_t bytes;

	struct omap_iommu *obj = s->private;



	if (is_omap_iommu_detached(obj))

		return -EPERM;



	buf = (char *)__get_free_page(GFP_KERNEL);

	if (!buf)

		return -ENOMEM;

	p = buf;



	p += sprintf(p, "L: %8s %8s\n", "da:", "pa:");

	p += sprintf(p, "-----------------------------------------\n");



	mutex_lock(&iommu_debug_lock);



	bytes = PAGE_SIZE - (p - buf);

	p += dump_ioptable(obj, p, bytes);



	bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);

	seq_printf(s, "L: %8s %8s\n", "da:", "pte:");

	seq_puts(s, "--------------------------\n");

	dump_ioptable(s);



	mutex_unlock(&iommu_debug_lock);

	free_page((unsigned long)buf);



	return bytes;

	return 0;

}



#define DEBUG_SEQ_FOPS_RO(name)						       \

	static int debug_open_##name(struct inode *inode, struct file *file)   \

	{								       \

		return single_open(file, debug_read_##name, inode->i_private); \

	}								       \

									       \

	static const struct file_operations debug_##name##_fops = {	       \

		.open		= debug_open_##name,			       \

		.read		= seq_read,				       \

		.llseek		= seq_lseek,				       \

		.release	= single_release,			       \

	}



#define DEBUG_FOPS_RO(name)						\
@@ -183,7 +158,7 @@ static ssize_t debug_read_pagetable(struct file *file, char __user *userbuf, 


DEBUG_FOPS_RO(regs);

DEBUG_FOPS_RO(tlb);

DEBUG_FOPS_RO(pagetable);

DEBUG_SEQ_FOPS_RO(pagetable);



#define __DEBUG_ADD_FILE(attr, mode)					\

	{								\

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