OMAP: iommu: add initial debugfs support

[safe/jmp/linux-2.6] / arch / arm / plat-omap / iommu.c

diff --git a/arch/arm/plat-omap/iommu.c b/arch/arm/plat-omap/iommu.c
index 4a03013..4b60127 100644 (file)
--- a/arch/arm/plat-omap/iommu.c
+++ b/arch/arm/plat-omap/iommu.c
@@ -351,16 +351,14 @@ EXPORT_SYMBOL_GPL(flush_iotlb_all);
 
 #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 @@ ssize_t iommu_dump_ctx(struct iommu *obj, char *buf)
 }
 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 @@ static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
        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 @@ static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs)
  * @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);