gpu: pvr: add debugfs interface for the command trace

Signed-off-by: Imre Deak <imre.deak@nokia.com>
Reviewed-by: Luc Verhaegen <libv@codethink.co.uk>

diff --git a/pvr/pvr_debugfs.c b/pvr/pvr_debugfs.c
index 4a9e068..40e30cf 100644 (file)
--- a/pvr/pvr_debugfs.c
+++ b/pvr/pvr_debugfs.c
@@ -40,6 +40,7 @@
 #include "mmu.h"
 #include "bridged_support.h"
 #include "mm.h"
+#include "pvr_trace_cmd.h"
 
 struct dentry *pvr_debugfs_dir;
 static u32 pvr_reset;
@@ -232,6 +233,75 @@ static const struct file_operations pvr_debugfs_edm_fops = {
 };
 #endif /* PVRSRV_USSE_EDM_STATUS_DEBUG */
 
+#ifdef CONFIG_PVR_TRACE_CMD
+
+static void *trcmd_str_buf;
+static u8 *trcmd_snapshot;
+static size_t trcmd_snapshot_size;
+static int trcmd_open_cnt;
+
+static int pvr_dbg_trcmd_open(struct inode *inode, struct file *file)
+{
+       int r;
+
+       if (trcmd_open_cnt)
+               return -EBUSY;
+
+       trcmd_open_cnt++;
+
+       trcmd_str_buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
+       if (!trcmd_str_buf) {
+               trcmd_open_cnt--;
+
+               return -ENOMEM;
+       }
+
+       pvr_trcmd_lock();
+
+       r = pvr_trcmd_create_snapshot(&trcmd_snapshot, &trcmd_snapshot_size);
+       if (r < 0) {
+               pvr_trcmd_unlock();
+               kfree(trcmd_str_buf);
+               trcmd_open_cnt--;
+
+               return r;
+       }
+
+       pvr_trcmd_unlock();
+
+       return 0;
+}
+
+static int pvr_dbg_trcmd_release(struct inode *inode, struct file *file)
+{
+       pvr_trcmd_destroy_snapshot(trcmd_snapshot);
+       kfree(trcmd_str_buf);
+       trcmd_open_cnt--;
+
+       return 0;
+}
+
+static ssize_t pvr_dbg_trcmd_read(struct file *file, char __user *buffer,
+                                 size_t count, loff_t *ppos)
+{
+       ssize_t ret;
+
+       ret = pvr_trcmd_print(trcmd_str_buf, max_t(size_t, PAGE_SIZE, count),
+                             trcmd_snapshot, trcmd_snapshot_size, ppos);
+       if (copy_to_user(buffer, trcmd_str_buf, ret))
+               return -EFAULT;
+
+       return ret;
+}
+
+static const struct file_operations pvr_dbg_trcmd_fops = {
+       .owner          = THIS_MODULE,
+       .open           = pvr_dbg_trcmd_open,
+       .release        = pvr_dbg_trcmd_release,
+       .read           = pvr_dbg_trcmd_read,
+};
+#endif
+
 /*
  *
  * HW Recovery dumping support.
@@ -1076,7 +1146,13 @@ int pvr_debugfs_init(void)
                return -ENODEV;
        }
 #endif
-
+#ifdef CONFIG_PVR_TRACE_CMD
+       if (!debugfs_create_file("command_trace", S_IRUGO, pvr_debugfs_dir,
+                                NULL, &pvr_dbg_trcmd_fops)) {
+               debugfs_remove_recursive(pvr_debugfs_dir);
+               return -ENODEV;
+       }
+#endif
        if (!debugfs_create_file("hwrec_event", S_IRUSR, pvr_debugfs_dir, NULL,
                                 &hwrec_event_fops)) {
                debugfs_remove_recursive(pvr_debugfs_dir);