drm: Use names of ioctls in debug traces

The intention here is to make the output of dmesg with full verbosity a
bit easier for a human to parse. This commit transforms:

[drm:drm_ioctl], pid=699, cmd=0x6458, nr=0x58, dev 0xe200, auth=1
[drm:drm_ioctl], pid=699, cmd=0xc010645b, nr=0x5b, dev 0xe200, auth=1
[drm:drm_ioctl], pid=699, cmd=0xc0106461, nr=0x61, dev 0xe200, auth=1
[drm:drm_ioctl], pid=699, cmd=0xc01c64ae, nr=0xae, dev 0xe200, auth=1
[drm:drm_mode_addfb], [FB:32]
[drm:drm_ioctl], pid=699, cmd=0xc0106464, nr=0x64, dev 0xe200, auth=1
[drm:drm_vm_open_locked], 0x7fd9302fe000,0x00a00000
[drm:drm_ioctl], pid=699, cmd=0x400c645f, nr=0x5f, dev 0xe200, auth=1
[drm:drm_ioctl], pid=699, cmd=0xc00464af, nr=0xaf, dev 0xe200, auth=1
[drm:intel_crtc_set_config], [CRTC:3] [NOFB]

into:

[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_THROTTLE
[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_CREATE
[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_SET_TILING
[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, IOCTL_MODE_ADDFB
[drm:drm_mode_addfb], [FB:32]
[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_MMAP_GTT
[drm:drm_vm_open_locked], 0x7fd9302fe000,0x00a00000
[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, I915_GEM_SET_DOMAIN
[drm:drm_ioctl], pid=699, dev=0xe200, auth=1, DRM_IOCTL_MODE_RMFB
[drm:intel_crtc_set_config], [CRTC:3] [NOFB]

v2: drm_ioctls is now a constant (Ville Syrjälä)

Signed-off-by: Chris Cummins <christopher.e.cummins@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 15 insertions, 8 deletions

diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
index 8d4f29075af5..9cc247f55502 100644
--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -57,7 +57,7 @@ static int drm_version(struct drm_device *dev, void *data,
                        struct drm_file *file_priv);
 
 #define DRM_IOCTL_DEF(ioctl, _func, _flags) \
-        [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0}
+        [DRM_IOCTL_NR(ioctl)] = {.cmd = ioctl, .func = _func, .flags = _flags, .cmd_drv = 0, .name = #ioctl}
 
 /** Ioctl table */
 static const struct drm_ioctl_desc drm_ioctls[] = {
@@ -375,7 +375,7 @@ long drm_ioctl(struct file *filp,
 {
         struct drm_file *file_priv = filp->private_data;
         struct drm_device *dev;
-        const struct drm_ioctl_desc *ioctl;
+        const struct drm_ioctl_desc *ioctl = NULL;
         drm_ioctl_t *func;
         unsigned int nr = DRM_IOCTL_NR(cmd);
         int retcode = -EINVAL;
@@ -392,11 +392,6 @@ long drm_ioctl(struct file *filp,
         atomic_inc(&dev->counts[_DRM_STAT_IOCTLS]);
         ++file_priv->ioctl_count;
 
-        DRM_DEBUG("pid=%d, cmd=0x%02x, nr=0x%02x, dev 0x%lx, auth=%d\n",
-                  task_pid_nr(current), cmd, nr,
-                  (long)old_encode_dev(file_priv->minor->device),
-                  file_priv->authenticated);
-
         if ((nr >= DRM_CORE_IOCTL_COUNT) &&
             ((nr < DRM_COMMAND_BASE) || (nr >= DRM_COMMAND_END)))
                 goto err_i1;
@@ -417,6 +412,11 @@ long drm_ioctl(struct file *filp,
         } else
                 goto err_i1;
 
+        DRM_DEBUG("pid=%d, dev=0x%lx, auth=%d, %s\n",
+                  task_pid_nr(current),
+                  (long)old_encode_dev(file_priv->minor->device),
+                  file_priv->authenticated, ioctl->name);
+
         /* Do not trust userspace, use our own definition */
         func = ioctl->func;
         /* is there a local override? */
@@ -471,6 +471,12 @@ long drm_ioctl(struct file *filp,
         }
 
       err_i1:
+        if (!ioctl)
+                DRM_DEBUG("invalid iotcl: pid=%d, dev=0x%lx, auth=%d, cmd=0x%02x, nr=0x%02x\n",
+                          task_pid_nr(current),
+                          (long)old_encode_dev(file_priv->minor->device),
+                          file_priv->authenticated, cmd, nr);
+
         if (kdata != stack_kdata)
                 kfree(kdata);
         atomic_dec(&dev->ioctl_count);
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index f1ce786736e4..b092b5bcf227 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -316,6 +316,7 @@ struct drm_ioctl_desc {
         int flags;
         drm_ioctl_t *func;
         unsigned int cmd_drv;
+        const char *name;
 };
 
 /**
@@ -324,7 +325,7 @@ struct drm_ioctl_desc {
  */
 
 #define DRM_IOCTL_DEF_DRV(ioctl, _func, _flags)                 \
-        [DRM_IOCTL_NR(DRM_##ioctl)] = {.cmd = DRM_##ioctl, .func = _func, .flags = _flags, .cmd_drv = DRM_IOCTL_##ioctl}
+        [DRM_IOCTL_NR(DRM_##ioctl)] = {.cmd = DRM_##ioctl, .func = _func, .flags = _flags, .cmd_drv = DRM_IOCTL_##ioctl, .name = #ioctl}
 
 struct drm_magic_entry {
         struct list_head head;