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path: root/drivers/gpu/drm/drm_gem_ttm_helper.c
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Diffstat (limited to 'drivers/gpu/drm/drm_gem_ttm_helper.c')
-rw-r--r--drivers/gpu/drm/drm_gem_ttm_helper.c84
1 files changed, 84 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_gem_ttm_helper.c b/drivers/gpu/drm/drm_gem_ttm_helper.c
new file mode 100644
index 000000000000..605a8a3da7f9
--- /dev/null
+++ b/drivers/gpu/drm/drm_gem_ttm_helper.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/module.h>
+
+#include <drm/drm_gem_ttm_helper.h>
+
+/**
+ * DOC: overview
+ *
+ * This library provides helper functions for gem objects backed by
+ * ttm.
+ */
+
+/**
+ * drm_gem_ttm_print_info() - Print &ttm_buffer_object info for debugfs
+ * @p: DRM printer
+ * @indent: Tab indentation level
+ * @gem: GEM object
+ *
+ * This function can be used as &drm_gem_object_funcs.print_info
+ * callback.
+ */
+void drm_gem_ttm_print_info(struct drm_printer *p, unsigned int indent,
+ const struct drm_gem_object *gem)
+{
+ static const char * const plname[] = {
+ [ TTM_PL_SYSTEM ] = "system",
+ [ TTM_PL_TT ] = "tt",
+ [ TTM_PL_VRAM ] = "vram",
+ [ TTM_PL_PRIV ] = "priv",
+
+ [ 16 ] = "cached",
+ [ 17 ] = "uncached",
+ [ 18 ] = "wc",
+ [ 19 ] = "contig",
+
+ [ 21 ] = "pinned", /* NO_EVICT */
+ [ 22 ] = "topdown",
+ };
+ const struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
+
+ drm_printf_indent(p, indent, "placement=");
+ drm_print_bits(p, bo->mem.placement, plname, ARRAY_SIZE(plname));
+ drm_printf(p, "\n");
+
+ if (bo->mem.bus.is_iomem) {
+ drm_printf_indent(p, indent, "bus.base=%lx\n",
+ (unsigned long)bo->mem.bus.base);
+ drm_printf_indent(p, indent, "bus.offset=%lx\n",
+ (unsigned long)bo->mem.bus.offset);
+ }
+}
+EXPORT_SYMBOL(drm_gem_ttm_print_info);
+
+/**
+ * drm_gem_ttm_mmap() - mmap &ttm_buffer_object
+ * @gem: GEM object.
+ * @vma: vm area.
+ *
+ * This function can be used as &drm_gem_object_funcs.mmap
+ * callback.
+ */
+int drm_gem_ttm_mmap(struct drm_gem_object *gem,
+ struct vm_area_struct *vma)
+{
+ struct ttm_buffer_object *bo = drm_gem_ttm_of_gem(gem);
+ int ret;
+
+ ret = ttm_bo_mmap_obj(vma, bo);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * ttm has its own object refcounting, so drop gem reference
+ * to avoid double accounting counting.
+ */
+ drm_gem_object_put_unlocked(gem);
+
+ return 0;
+}
+EXPORT_SYMBOL(drm_gem_ttm_mmap);
+
+MODULE_DESCRIPTION("DRM gem ttm helpers");
+MODULE_LICENSE("GPL");