[PATCH v3 24/32] drm/via: Add via_ttm.c

[Kevin Brace]

From: Kevin Brace <kevinbrace at bracecomputerlab.com>

Signed-off-by: Kevin Brace <kevinbrace at bracecomputerlab.com>
---
 drivers/gpu/drm/via/via_ttm.c | 168 ++++++++++++++++++++++++++++++++++
 1 file changed, 168 insertions(+)
 create mode 100644 drivers/gpu/drm/via/via_ttm.c

diff --git a/drivers/gpu/drm/via/via_ttm.c b/drivers/gpu/drm/via/via_ttm.c
new file mode 100644
index 000000000000..8676623ee074
--- /dev/null
+++ b/drivers/gpu/drm/via/via_ttm.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright © 2018-2019 Kevin Brace.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHOR(S) OR COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Author(s):
+ * Kevin Brace <kevinbrace at bracecomputerlab.com>
+ */
+/*
+ * via_ttm.c
+ *
+ * TTM code as part of the TTM memory allocator.
+ * Currently a basic implementation with no DMA support.
+ *
+ */
+
+#include <linux/pci.h>
+
+#include <drm/ttm/ttm_bo_api.h>
+#include <drm/ttm/ttm_bo_driver.h>
+
+#include "via_drv.h"
+
+
+static void via_bo_move_notify(struct ttm_buffer_object *bo, bool evict,
+				struct ttm_resource *new_mem)
+{
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return;
+}
+
+static struct ttm_tt *via_ttm_tt_create(struct ttm_buffer_object *bo,
+					uint32_t page_flags)
+{
+	struct ttm_tt *tt;
+	int ret;
+
+	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+	if (!tt)
+		return NULL;
+
+	ret = ttm_tt_init(tt, bo, page_flags, ttm_cached, 0);
+	if (ret < 0)
+		goto err_ttm_tt_init;
+
+	return tt;
+
+err_ttm_tt_init:
+	kfree(tt);
+	return NULL;
+}
+
+static void via_ttm_tt_destroy(struct ttm_device *bdev, struct ttm_tt *tt)
+{
+	ttm_tt_fini(tt);
+	kfree(tt);
+}
+
+static void via_bo_evict_flags(struct ttm_buffer_object *bo,
+				struct ttm_placement *placement)
+{
+	struct via_bo *driver_bo = to_ttm_bo(bo);
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	if (bo->destroy == &via_ttm_bo_destroy) {
+		goto exit;
+	}
+
+	switch (bo->resource->mem_type) {
+	case TTM_PL_VRAM:
+		via_ttm_domain_to_placement(driver_bo, TTM_PL_VRAM);
+		break;
+	default:
+		via_ttm_domain_to_placement(driver_bo, TTM_PL_SYSTEM);
+		break;
+	}
+
+	*placement = driver_bo->placement;
+exit:
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static int via_bo_move(struct ttm_buffer_object *bo, bool evict,
+			struct ttm_operation_ctx *ctx,
+			struct ttm_resource *new_mem,
+			struct ttm_place *hop)
+{
+	int ret;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	via_bo_move_notify(bo, evict, new_mem);
+	ret = ttm_bo_move_memcpy(bo, ctx, new_mem);
+	if (ret) {
+		swap(*new_mem, *bo->resource);
+		via_bo_move_notify(bo, false, new_mem);
+		swap(*new_mem, *bo->resource);
+	}
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return ret;
+}
+
+static void via_bo_delete_mem_notify(struct ttm_buffer_object *bo)
+{
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	via_bo_move_notify(bo, false, NULL);
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return;
+}
+
+static int via_bo_io_mem_reserve(struct ttm_device *bdev,
+					struct ttm_resource *mem)
+{
+	struct via_drm_priv *dev_priv = container_of(bdev,
+						struct via_drm_priv, bdev);
+	int ret = 0;
+
+	DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+		break;
+	case TTM_PL_VRAM:
+		mem->bus.offset = dev_priv->vram_start +
+					(mem->start << PAGE_SHIFT);
+		mem->bus.is_iomem = true;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+	return ret;
+}
+
+struct ttm_device_funcs via_bo_driver = {
+	.ttm_tt_create = via_ttm_tt_create,
+	.ttm_tt_destroy = via_ttm_tt_destroy,
+	.eviction_valuable = ttm_bo_eviction_valuable,
+	.evict_flags = via_bo_evict_flags,
+	.move = via_bo_move,
+	.delete_mem_notify = via_bo_delete_mem_notify,
+	.io_mem_reserve = via_bo_io_mem_reserve,
+};
--
2.35.1