OMAP: iommu: add initial debugfs support
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>
diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
index 4a03013..4b60127 100644
--- a/arch/arm/plat-omap/iommu.c
+++ b/arch/arm/plat-omap/iommu.c
@@ -351,16 +351,14 @@
#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
-ssize_t iommu_dump_ctx(struct iommu *obj, char *buf)
+ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t bytes)
{
- ssize_t bytes;
-
if (!obj || !buf)
return -EINVAL;
clk_enable(obj->clk);
- bytes = arch_iommu->dump_ctx(obj, buf);
+ bytes = arch_iommu->dump_ctx(obj, buf, bytes);
clk_disable(obj->clk);
@@ -368,7 +366,7 @@
}
EXPORT_SYMBOL_GPL(iommu_dump_ctx);
-static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
+static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs, int num)
{
int i;
struct iotlb_lock saved, l;
@@ -379,7 +377,7 @@
iotlb_lock_get(obj, &saved);
memcpy(&l, &saved, sizeof(saved));
- for (i = 0; i < obj->nr_tlb_entries; i++) {
+ for (i = 0; i < num; i++) {
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
@@ -402,18 +400,21 @@
* @obj: target iommu
* @buf: output buffer
**/
-size_t dump_tlb_entries(struct iommu *obj, char *buf)
+size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t bytes)
{
- int i, n;
+ int i, num;
struct cr_regs *cr;
char *p = buf;
- cr = kcalloc(obj->nr_tlb_entries, sizeof(*cr), GFP_KERNEL);
+ num = bytes / sizeof(*cr);
+ num = min(obj->nr_tlb_entries, num);
+
+ cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
if (!cr)
return 0;
- n = __dump_tlb_entries(obj, cr);
- for (i = 0; i < n; i++)
+ num = __dump_tlb_entries(obj, cr, num);
+ for (i = 0; i < num; i++)
p += iotlb_dump_cr(obj, cr + i, p);
kfree(cr);