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OMAP: iommu: add initial debugfs support

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This enables to peek the following data.

$ /debug/iommu/isp# ls
mem             nr_tlb_entries  regs
mmap            pagetable       tlb
$ /debug/iommu/isp# head pagetable
L:      da:      pa:
-----------------------------------------
2: 00001000 8ae4a002
2: 00002000 8e7bb002
2: 00003000 8ae49002
2: 00004000 8ae65002
.....

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Hiroshi DOYU
2009-08-28 10:54:41 -07:00
committed by Tony Lindgren
parent 613f77696e
commit 14e0e6796a
6 changed files with 448 additions and 18 deletions
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17
arch/arm/mach-omap2/iommu2.c
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@@ -217,10 +217,19 @@ static ssize_t omap2_dump_cr(struct iommu *obj, struct cr_regs *cr, char *buf)
}
#define pr_reg(name) \
p += sprintf(p, "%20s: %08x\n", \
__stringify(name), iommu_read_reg(obj, MMU_##name));
do { \
ssize_t bytes; \
const char *str = "%20s: %08x\n"; \
const int maxcol = 32; \
bytes = snprintf(p, maxcol, str, __stringify(name), \
iommu_read_reg(obj, MMU_##name)); \
p += bytes; \
len -= bytes; \
if (len < maxcol) \
goto out; \
} while (0)
static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf)
static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t len)
{
char *p = buf;
@@ -242,7 +251,7 @@ static ssize_t omap2_iommu_dump_ctx(struct iommu *obj, char *buf)
pr_reg(READ_CAM);
pr_reg(READ_RAM);
pr_reg(EMU_FAULT_AD);
out:
return p - buf;
}