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path: root/drivers/iommu/omap-iommu-debug.c
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Diffstat (limited to 'drivers/iommu/omap-iommu-debug.c')
-rw-r--r--drivers/iommu/omap-iommu-debug.c132
1 files changed, 112 insertions, 20 deletions
diff --git a/drivers/iommu/omap-iommu-debug.c b/drivers/iommu/omap-iommu-debug.c
index f3d20a203..9bc20e211 100644
--- 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)
{
@@ -55,34 +109,72 @@ static ssize_t debug_read_regs(struct file *file, char __user *userbuf,
return bytes;
}
-static ssize_t debug_read_tlb(struct file *file, char __user *userbuf,
- size_t count, loff_t *ppos)
+static int
+__dump_tlb_entries(struct omap_iommu *obj, struct cr_regs *crs, int num)
{
- struct omap_iommu *obj = file->private_data;
- char *p, *buf;
- ssize_t bytes, rest;
+ 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,
+ struct seq_file *s)
+{
+ seq_printf(s, "%08x %08x %01x\n", cr->cam, cr->ram,
+ (cr->cam & MMU_CAM_P) ? 1 : 0);
+ return 0;
+}
+
+static size_t omap_dump_tlb_entries(struct omap_iommu *obj, struct seq_file *s)
+{
+ int i, num;
+ struct cr_regs *cr;
+
+ num = obj->nr_tlb_entries;
+
+ cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
+ if (!cr)
+ return 0;
+
+ num = __dump_tlb_entries(obj, cr, num);
+ for (i = 0; i < num; i++)
+ iotlb_dump_cr(obj, cr + i, s);
+ kfree(cr);
+
+ return 0;
+}
+
+static int debug_read_tlb(struct seq_file *s, void *data)
+{
+ struct omap_iommu *obj = s->private;
if (is_omap_iommu_detached(obj))
return -EPERM;
- buf = kmalloc(count, GFP_KERNEL);
- if (!buf)
- return -ENOMEM;
- p = buf;
-
mutex_lock(&iommu_debug_lock);
- p += sprintf(p, "%8s %8s\n", "cam:", "ram:");
- p += sprintf(p, "-----------------------------------------\n");
- rest = count - (p - buf);
- p += omap_dump_tlb_entries(obj, p, rest);
-
- bytes = simple_read_from_buffer(userbuf, count, ppos, buf, p - buf);
+ seq_printf(s, "%8s %8s\n", "cam:", "ram:");
+ seq_puts(s, "-----------------------------------------\n");
+ omap_dump_tlb_entries(obj, s);
mutex_unlock(&iommu_debug_lock);
- kfree(buf);
- return bytes;
+ return 0;
}
static void dump_ioptable(struct seq_file *s)
@@ -154,10 +246,10 @@ static int debug_read_pagetable(struct seq_file *s, void *data)
.open = simple_open, \
.read = debug_read_##name, \
.llseek = generic_file_llseek, \
- };
+ }
DEBUG_FOPS_RO(regs);
-DEBUG_FOPS_RO(tlb);
+DEBUG_SEQ_FOPS_RO(tlb);
DEBUG_SEQ_FOPS_RO(pagetable);
#define __DEBUG_ADD_FILE(attr, mode) \