iommu/omap: Move debugfs functions to omap-iommu-debug.c

[firefly-linux-kernel-4.4.55.git] / drivers / iommu / omap-iommu-debug.c

diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
index f3d20a2039d20417093fd70c6192b905e7c3ccf8..b4b96db37e6adba62ff69404dffef887b00c10e9 100644 (file)
--- a/drivers/iommu/omap-iommu-debug.c
+++ b/drivers/iommu/omap-iommu-debug.c
@@ -14,6 +14,7 @@
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/uaccess.h>
+#include <linux/pm_runtime.h>
 #include <linux/debugfs.h>
 #include <linux/platform_data/iommu-omap.h>
 
@@ -29,6 +30,59 @@ static inline bool is_omap_iommu_detached(struct omap_iommu *obj)
        return !obj->domain;
 }
 
+#define pr_reg(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 omap_iommu *obj, char *buf, ssize_t len)
+{
+       char *p = buf;
+
+       pr_reg(REVISION);
+       pr_reg(IRQSTATUS);
+       pr_reg(IRQENABLE);
+       pr_reg(WALKING_ST);
+       pr_reg(CNTL);
+       pr_reg(FAULT_AD);
+       pr_reg(TTB);
+       pr_reg(LOCK);
+       pr_reg(LD_TLB);
+       pr_reg(CAM);
+       pr_reg(RAM);
+       pr_reg(GFLUSH);
+       pr_reg(FLUSH_ENTRY);
+       pr_reg(READ_CAM);
+       pr_reg(READ_RAM);
+       pr_reg(EMU_FAULT_AD);
+out:
+       return p - buf;
+}
+
+static ssize_t omap_iommu_dump_ctx(struct omap_iommu *obj, char *buf,
+                                  ssize_t bytes)
+{
+       if (!obj || !buf)
+               return -EINVAL;
+
+       pm_runtime_get_sync(obj->dev);
+
+       bytes = omap2_iommu_dump_ctx(obj, buf, bytes);
+
+       pm_runtime_put_sync(obj->dev);
+
+       return bytes;
+}
+
 static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
                               size_t count, loff_t *ppos)
 {
@@ -55,6 +109,63 @@ static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
        return bytes;
 }
 
+static int
+__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
+{
+       int i;
+       struct iotlb_lock saved;
+       struct cr_regs tmp;
+       struct cr_regs *p = crs;
+
+       pm_runtime_get_sync(obj->dev);
+       iotlb_lock_get(obj, &saved);
+
+       for_each_iotlb_cr(obj, num, i, tmp) {
+               if (!iotlb_cr_valid(&tmp))
+                       continue;
+               *p++ = tmp;
+       }
+
+       iotlb_lock_set(obj, &saved);
+       pm_runtime_put_sync(obj->dev);
+
+       return  p - crs;
+}
+
+static ssize_t iotlb_dump_cr(struct omap_iommu *obj, struct cr_regs *cr,
+                            char *buf)
+{
+       char *p = buf;
+
+       /* FIXME: Need more detail analysis of cam/ram */
+       p += sprintf(p, "%08x %08x %01x\n", cr->cam, cr->ram,
+                                       (cr->cam & MMU_CAM_P) ? 1 : 0);
+
+       return p - buf;
+}
+
+static size_t omap_dump_tlb_entries(struct omap_iommu *obj, char *buf,
+                                   ssize_t bytes)
+{
+       int i, num;
+       struct cr_regs *cr;
+       char *p = buf;
+
+       num = bytes / sizeof(*cr);
+       num = min(obj->nr_tlb_entries, num);
+
+       cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
+       if (!cr)
+               return 0;
+
+       num = __dump_tlb_entries(obj, cr, num);
+       for (i = 0; i < num; i++)
+               p += iotlb_dump_cr(obj, cr + i, p);
+       kfree(cr);
+
+       return p - buf;
+}
+
 static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
                              size_t count, loff_t *ppos)
 {