[PATCH 18/28] drm/via: Add via_object.c

From: Kevin Brace <kevinbrace@gmx.com>
To: dri-devel@lists.freedesktop.org
Cc: Kevin Brace <kevinbrace@bracecomputerlab.com>
Subject: [PATCH 18/28] drm/via: Add via_object.c
Date: Fri, 24 Jun 2022 15:26:23 -0500	[thread overview]
Message-ID: <20220624202633.3978-19-kevinbrace@gmx.com> (raw)
In-Reply-To: <20220624202633.3978-1-kevinbrace@gmx.com>

From: Kevin Brace <kevinbrace@bracecomputerlab.com>

Signed-off-by: Kevin Brace <kevinbrace@bracecomputerlab.com>
---
 drivers/gpu/drm/via/via_object.c | 324 +++++++++++++++++++++++++++++++
 1 file changed, 324 insertions(+)
 create mode 100644 drivers/gpu/drm/via/via_object.c

diff --git a/drivers/gpu/drm/via/via_object.c b/drivers/gpu/drm/via/via_object.c
new file mode 100644
index 000000000000..96fb2934d0de
--- /dev/null
+++ b/drivers/gpu/drm/via/via_object.c
@@ -0,0 +1,324 @@
+/*
+ * 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__);
+}
--
2.35.1

