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+/*
+ * 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@bracecomputerlab.com>
+ */
+/*
+ * via_object.c
+ *
+ * Manages Buffer Objects (BO) via TTM.
+ * Part of the TTM memory allocator.
+ *
+ */
+
+#include <drm/drm_file.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_gem_ttm_helper.h>
+
+#include <drm/ttm/ttm_bo_api.h>
+#include <drm/ttm/ttm_bo_driver.h>
+#include <drm/ttm/ttm_range_manager.h>
+
+#include "via_drv.h"
+
+
+static void via_gem_free(struct drm_gem_object *obj)
+{
+ struct ttm_buffer_object *ttm_bo;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ ttm_bo = container_of(obj, struct ttm_buffer_object, base);
+
+ ttm_bo_put(ttm_bo);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+static const struct vm_operations_struct via_ttm_bo_vm_ops = {
+ .fault = ttm_bo_vm_fault,
+ .open = ttm_bo_vm_open,
+ .close = ttm_bo_vm_close,
+ .access = ttm_bo_vm_access
+};
+
+static const struct drm_gem_object_funcs via_gem_object_funcs = {
+ .free = via_gem_free,
+ .vmap = drm_gem_ttm_vmap,
+ .vunmap = drm_gem_ttm_vunmap,
+ .mmap = drm_gem_ttm_mmap,
+ .vm_ops = &via_ttm_bo_vm_ops,
+};
+
+void via_ttm_domain_to_placement(struct via_bo *bo,
+ uint32_t ttm_domain)
+{
+ unsigned i = 0;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ bo->placement.placement = bo->placements;
+ bo->placement.busy_placement = bo->placements;
+
+ if (ttm_domain == TTM_PL_SYSTEM) {
+ bo->placements[i].fpfn = 0;
+ bo->placements[i].lpfn = 0;
+ bo->placements[i].mem_type = TTM_PL_SYSTEM;
+ bo->placements[i].flags = 0;
+ i++;
+ }
+
+ if (ttm_domain == TTM_PL_TT) {
+ bo->placements[i].fpfn = 0;
+ bo->placements[i].lpfn = 0;
+ bo->placements[i].mem_type = TTM_PL_TT;
+ bo->placements[i].flags = 0;
+ i++;
+ }
+
+ if (ttm_domain == TTM_PL_VRAM) {
+ bo->placements[i].fpfn = 0;
+ bo->placements[i].lpfn = 0;
+ bo->placements[i].mem_type = TTM_PL_VRAM;
+ bo->placements[i].flags = 0;
+ i++;
+ }
+
+ bo->placement.num_placement = i;
+ bo->placement.num_busy_placement = i;
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+void via_ttm_bo_destroy(struct ttm_buffer_object *tbo)
+{
+ struct via_bo *bo;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ bo = to_ttm_bo(tbo);
+
+ drm_gem_object_release(&tbo->base);
+ kfree(bo);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+int via_bo_pin(struct via_bo *bo, uint32_t ttm_domain)
+{
+ struct ttm_buffer_object *ttm_bo;
+ struct ttm_operation_ctx ctx = {false, false};
+ int ret = 0;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ ttm_bo = &bo->ttm_bo;
+
+ if (ttm_bo->pin_count) {
+ goto pin;
+ }
+
+ via_ttm_domain_to_placement(bo, ttm_domain);
+ ret = ttm_bo_validate(ttm_bo, &bo->placement, &ctx);
+ if (ret) {
+ goto exit;
+ }
+
+pin:
+ ttm_bo_pin(ttm_bo);
+exit:
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+ return ret;
+}
+
+void via_bo_unpin(struct via_bo *bo)
+{
+ struct ttm_buffer_object *ttm_bo;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ ttm_bo = &bo->ttm_bo;
+
+ ttm_bo_unpin(ttm_bo);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+int via_bo_create(struct drm_device *dev,
+ struct ttm_device *bdev,
+ uint64_t size,
+ enum ttm_bo_type type,
+ uint32_t ttm_domain,
+ bool kmap,
+ struct via_bo **bo_ptr)
+{
+ struct ttm_buffer_object *ttm_bo;
+ struct via_drm_priv *dev_priv = to_via_drm_priv(dev);
+ struct via_bo *bo;
+ int ret;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ bo = kzalloc(sizeof(*bo), GFP_KERNEL);
+ if (!bo) {
+ DRM_ERROR("Cannot allocate a TTM buffer object.\n");
+ ret = -ENOMEM;
+ goto exit;
+ }
+
+ ttm_bo = &bo->ttm_bo;
+
+ /*
+ * It is an imperative to page align the requested buffer size
+ * prior to a memory allocation request, or various memory
+ * allocation related system instabilities may occur.
+ */
+ size = ALIGN(size, PAGE_SIZE);
+
+ ret = drm_gem_object_init(dev, &ttm_bo->base, size);
+ if (ret) {
+ DRM_ERROR("Cannot initialize a GEM object.\n");
+ goto error;
+ }
+
+ ttm_bo->base.funcs = &via_gem_object_funcs;
+
+ via_ttm_domain_to_placement(bo, ttm_domain);
+ ret = ttm_bo_init(&dev_priv->bdev, ttm_bo,
+ size, type, &bo->placement,
+ PAGE_SIZE >> PAGE_SHIFT, false,
+ NULL, NULL, via_ttm_bo_destroy);
+ if (ret) {
+ DRM_ERROR("Cannot initialize a TTM object.\n");
+ goto exit;
+ }
+
+ if (kmap) {
+ ret = ttm_bo_reserve(ttm_bo, true, false, NULL);
+ if (ret) {
+ ttm_bo_put(ttm_bo);
+ goto exit;
+ }
+
+ ret = via_bo_pin(bo, ttm_domain);
+ ttm_bo_unreserve(ttm_bo);
+ if (ret) {
+ ttm_bo_put(ttm_bo);
+ goto exit;
+ }
+
+ ret = ttm_bo_kmap(ttm_bo, 0, ttm_bo->resource->num_pages,
+ &bo->kmap);
+ if (ret) {
+ ttm_bo_put(ttm_bo);
+ goto exit;
+ }
+ }
+
+ *bo_ptr = bo;
+ goto exit;
+error:
+ kfree(bo);
+exit:
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+ return ret;
+}
+
+void via_bo_destroy(struct via_bo *bo, bool kmap)
+{
+ struct ttm_buffer_object *ttm_bo;
+ int ret;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ ttm_bo = &bo->ttm_bo;
+
+ if (kmap) {
+ ttm_bo_kunmap(&bo->kmap);
+
+ ret = ttm_bo_reserve(ttm_bo, true, false, NULL);
+ if (ret) {
+ goto exit;
+ }
+
+ via_bo_unpin(bo);
+ ttm_bo_unreserve(ttm_bo);
+ if (ret) {
+ goto exit;
+ }
+ }
+
+ ttm_bo_put(ttm_bo);
+exit:
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}
+
+int via_mm_init(struct via_drm_priv *dev_priv)
+{
+ struct drm_device *dev = &dev_priv->dev;
+ int ret;
+
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ /*
+ * Initialize bdev ttm_bo_device struct.
+ */
+ ret = ttm_device_init(&dev_priv->bdev,
+ &via_bo_driver,
+ dev->dev,
+ dev->anon_inode->i_mapping,
+ dev->vma_offset_manager,
+ false,
+ dev_priv->need_dma32);
+ if (ret) {
+ DRM_ERROR("Failed initializing buffer object driver.\n");
+ goto exit;
+ }
+
+ /*
+ * Initialize TTM range manager for VRAM management.
+ */
+ ret = ttm_range_man_init(&dev_priv->bdev, TTM_PL_VRAM,
+ false,
+ dev_priv->vram_size >> PAGE_SHIFT);
+ if (ret) {
+ DRM_ERROR("Failed initializing TTM VRAM memory manager.\n");
+ goto exit;
+ }
+
+exit:
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+ return ret;
+}
+
+void via_mm_fini(struct via_drm_priv *dev_priv)
+{
+ DRM_DEBUG_KMS("Entered %s.\n", __func__);
+
+ ttm_range_man_fini(&dev_priv->bdev, TTM_PL_VRAM);
+
+ ttm_device_fini(&dev_priv->bdev);
+
+ DRM_DEBUG_KMS("Exiting %s.\n", __func__);
+}