iommu: arm_smmu: Print total iova mapped in ptdump

Printing total iova mapped in ptdump sysfs can help debug
memory leaks. If the total keeps increasing, then it is likely
that there is some kind of leak.

sample output:-

root@t186_int:/d/12000000.iommu/cb000 # cat ptdump
va=0x0000000080000000 pa=0x000000027396e000 *pte=0x006000027396ef43
va=0x0000000080001000 pa=0x000000027396f000 *pte=0x006000027396ff43
total mapped iova=8KB

bug 200182275

Change-Id: Ie6bed9ee954e251a6ee80b41093cd1f577583e1a
Signed-off-by: Sri Krishna chowdary <schowdary@nvidia.com>
Reviewed-on: http://git-master/r/1194365
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Pritesh Raithatha <praithatha@nvidia.com>
GVS: Gerrit_Virtual_Submit

diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index a8449c01ab1f5be137cc1a978037d80c6371e421..12c09da697f39c28113a25cb0f9da1c292adb0ee 100644 (file)
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1610,6 +1610,7 @@ static int smmu_ptdump_show(struct seq_file *s, void *unused)
        pte_t *pte;
        int i, j, k, l;
        unsigned long addr = 0;
+       unsigned long mapped = 0;
 
        pgd = cfg->pgd;
        for (i = 0; i < PTRS_PER_PGD;
@@ -1639,12 +1640,14 @@ static int smmu_ptdump_show(struct seq_file *s, void *unused)
                                        seq_printf(s,
                                                   "va=0x%016lx pa=%pap *pte=%pad\n",
                                                   addr, &pa, &(*pte));
+                                       mapped += PAGE_SIZE;
                                }
                        }
                        if ((ulong)pgd != (ulong)pud)
                                addr += PUD_SIZE;
                }
        }
+       seq_printf(s, "total mapped iova=%luKB\n", mapped / SZ_1K);
        return 0;
 }