drm/radeon/kms: bogus cs recorder utilities

This add an utilities function radeon_ib_bogus_add which will
save an ib into a list of ib which can then be dumped using
debugfs. Once dumped the ib is removed from the list. This
should allow to save & capute ib for further debugging.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 68 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 3f353131bb38..b519d7db2dcb 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -383,6 +383,7 @@ struct radeon_ib_pool {
         struct mutex            mutex;
         struct radeon_bo        *robj;
         struct list_head        scheduled_ibs;
+        struct list_head        bogus_ib;
         struct radeon_ib        ibs[RADEON_IB_POOL_SIZE];
         bool                    ready;
         DECLARE_BITMAP(alloc_bm, RADEON_IB_POOL_SIZE);
@@ -437,6 +438,7 @@ int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib);
 int radeon_ib_pool_init(struct radeon_device *rdev);
 void radeon_ib_pool_fini(struct radeon_device *rdev);
 int radeon_ib_test(struct radeon_device *rdev);
+extern void radeon_ib_bogus_add(struct radeon_device *rdev, struct radeon_ib *ib);
 /* Ring access between begin & end cannot sleep */
 void radeon_ring_free_size(struct radeon_device *rdev);
 int radeon_ring_lock(struct radeon_device *rdev, unsigned ndw);
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index 4d12b2d17b4d..e3bee59ef6c3 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -34,6 +34,36 @@
 
 int radeon_debugfs_ib_init(struct radeon_device *rdev);
 
+void radeon_ib_bogus_cleanup(struct radeon_device *rdev)
+{
+        struct radeon_ib *ib, *n;
+
+        list_for_each_entry_safe(ib, n, &rdev->ib_pool.bogus_ib, list) {
+                list_del(&ib->list);
+                vfree(ib->ptr);
+                kfree(ib);
+        }
+}
+
+void radeon_ib_bogus_add(struct radeon_device *rdev, struct radeon_ib *ib)
+{
+        struct radeon_ib *bib;
+
+        bib = kmalloc(sizeof(*bib), GFP_KERNEL);
+        if (bib == NULL)
+                return;
+        bib->ptr = vmalloc(ib->length_dw * 4);
+        if (bib->ptr == NULL) {
+                kfree(bib);
+                return;
+        }
+        memcpy(bib->ptr, ib->ptr, ib->length_dw * 4);
+        bib->length_dw = ib->length_dw;
+        mutex_lock(&rdev->ib_pool.mutex);
+        list_add_tail(&bib->list, &rdev->ib_pool.bogus_ib);
+        mutex_unlock(&rdev->ib_pool.mutex);
+}
+
 /*
  * IB.
  */
@@ -163,6 +193,7 @@ int radeon_ib_pool_init(struct radeon_device *rdev)
 
         if (rdev->ib_pool.robj)
                 return 0;
+        INIT_LIST_HEAD(&rdev->ib_pool.bogus_ib);
         /* Allocate 1M object buffer */
         INIT_LIST_HEAD(&rdev->ib_pool.scheduled_ibs);
         r = radeon_bo_create(rdev, NULL,  RADEON_IB_POOL_SIZE*64*1024,
@@ -214,6 +245,7 @@ void radeon_ib_pool_fini(struct radeon_device *rdev)
                 return;
         }
         mutex_lock(&rdev->ib_pool.mutex);
+        radeon_ib_bogus_cleanup(rdev);
         bitmap_zero(rdev->ib_pool.alloc_bm, RADEON_IB_POOL_SIZE);
         if (rdev->ib_pool.robj) {
                 r = radeon_bo_reserve(rdev->ib_pool.robj, false);
@@ -372,15 +404,49 @@ static int radeon_debugfs_ib_info(struct seq_file *m, void *data)
         return 0;
 }
 
+static int radeon_debugfs_ib_bogus_info(struct seq_file *m, void *data)
+{
+        struct drm_info_node *node = (struct drm_info_node *) m->private;
+        struct radeon_device *rdev = node->info_ent->data;
+        struct radeon_ib *ib;
+        unsigned i;
+
+        mutex_lock(&rdev->ib_pool.mutex);
+        if (list_empty(&rdev->ib_pool.bogus_ib)) {
+                mutex_unlock(&rdev->ib_pool.mutex);
+                seq_printf(m, "no bogus IB recorded\n");
+                return 0;
+        }
+        ib = list_first_entry(&rdev->ib_pool.bogus_ib, struct radeon_ib, list);
+        list_del_init(&ib->list);
+        mutex_unlock(&rdev->ib_pool.mutex);
+        seq_printf(m, "IB size %05u dwords\n", ib->length_dw);
+        for (i = 0; i < ib->length_dw; i++) {
+                seq_printf(m, "[%05u]=0x%08X\n", i, ib->ptr[i]);
+        }
+        vfree(ib->ptr);
+        kfree(ib);
+        return 0;
+}
+
 static struct drm_info_list radeon_debugfs_ib_list[RADEON_IB_POOL_SIZE];
 static char radeon_debugfs_ib_names[RADEON_IB_POOL_SIZE][32];
+
+static struct drm_info_list radeon_debugfs_ib_bogus_info_list[] = {
+        {"radeon_ib_bogus", radeon_debugfs_ib_bogus_info, 0, NULL},
+};
 #endif
 
 int radeon_debugfs_ib_init(struct radeon_device *rdev)
 {
 #if defined(CONFIG_DEBUG_FS)
         unsigned i;
+        int r;
 
+        radeon_debugfs_ib_bogus_info_list[0].data = rdev;
+        r = radeon_debugfs_add_files(rdev, radeon_debugfs_ib_bogus_info_list, 1);
+        if (r)
+                return r;
         for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
                 sprintf(radeon_debugfs_ib_names[i], "radeon_ib_%04u", i);
                 radeon_debugfs_ib_list[i].name = radeon_debugfs_ib_names[i];