[RFC 6/21] DRM: Add VIA DRM driver
James Simmons
jsimmons at infradead.org
Sat Jun 8 09:48:06 PDT 2013
commit 5ec2cdc6f99549122329253b1c4d1a04193b81d0
Author: James Simmons <jsimmons at infradead.org>
Date: Sat Jun 8 07:59:56 2013 -0400
via: TTM and GEM memory handling
TTM buffer object life cycle and state handling is done in init_ttm.c.
The VIA GEM implemenation is a simple wrapper around the TTM layer
that uses our ttm functions from init_ttm.c
Signed-Off-by: James Simmons <jsimmons at infradead.org>
diff --git a/drivers/gpu/drm/via/init_ttm.c b/drivers/gpu/drm/via/init_ttm.c
new file mode 100644
index 0000000..ead32a1
--- /dev/null
+++ b/drivers/gpu/drm/via/init_ttm.c
@@ -0,0 +1,249 @@
+/*
+ * Copyright (c) 2012 James Simmons
+ * All Rights Reserved.
+ *
+ * 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 COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ */
+
+#include "drmP.h"
+#include "ttm/ttm_bo_driver.h"
+#include "ttm/ttm_placement.h"
+
+#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
+
+struct ttm_heap {
+ uint32_t busy_placements[TTM_NUM_MEM_TYPES];
+ uint32_t placements[TTM_NUM_MEM_TYPES];
+ struct ttm_buffer_object pbo;
+};
+
+static int
+ttm_global_mem_init(struct drm_global_reference *ref)
+{
+ return ttm_mem_global_init(ref->object);
+}
+
+static void
+ttm_global_mem_release(struct drm_global_reference *ref)
+{
+ ttm_mem_global_release(ref->object);
+}
+
+void
+ttm_global_fini(struct drm_global_reference *global_ref,
+ struct ttm_bo_global_ref *global_bo,
+ struct ttm_bo_device *bdev)
+{
+ if (global_ref->release == NULL)
+ return;
+
+ if (bdev)
+ ttm_bo_device_release(bdev);
+ drm_global_item_unref(&global_bo->ref);
+ drm_global_item_unref(global_ref);
+ global_ref->release = NULL;
+}
+
+int
+ttm_global_init(struct drm_global_reference *global_ref,
+ struct ttm_bo_global_ref *global_bo,
+ struct ttm_bo_driver *driver,
+ struct ttm_bo_device *bdev,
+ bool dma32)
+{
+ struct drm_global_reference *bo_ref;
+ int rc;
+
+ global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+ global_ref->size = sizeof(struct ttm_mem_global);
+ global_ref->init = &ttm_global_mem_init;
+ global_ref->release = &ttm_global_mem_release;
+
+ rc = drm_global_item_ref(global_ref);
+ if (unlikely(rc != 0)) {
+ DRM_ERROR("Failed setting up TTM memory accounting\n");
+ global_ref->release = NULL;
+ return rc;
+ }
+
+ global_bo->mem_glob = global_ref->object;
+ bo_ref = &global_bo->ref;
+ bo_ref->global_type = DRM_GLOBAL_TTM_BO;
+ bo_ref->size = sizeof(struct ttm_bo_global);
+ bo_ref->init = &ttm_bo_global_init;
+ bo_ref->release = &ttm_bo_global_release;
+
+ rc = drm_global_item_ref(bo_ref);
+ if (unlikely(rc != 0)) {
+ DRM_ERROR("Failed setting up TTM BO subsystem\n");
+ drm_global_item_unref(global_ref);
+ global_ref->release = NULL;
+ return rc;
+ }
+
+ rc = ttm_bo_device_init(bdev, bo_ref->object, driver,
+ DRM_FILE_PAGE_OFFSET, dma32);
+ if (rc) {
+ DRM_ERROR("Error initialising bo driver: %d\n", rc);
+ ttm_global_fini(global_ref, global_bo, NULL);
+ }
+ return rc;
+}
+
+static void
+ttm_buffer_object_destroy(struct ttm_buffer_object *bo)
+{
+ struct ttm_heap *heap = container_of(bo, struct ttm_heap, pbo);
+
+ kfree(heap);
+ heap = NULL;
+}
+
+/*
+ * the buffer object domain
+ */
+void
+ttm_placement_from_domain(struct ttm_buffer_object *bo, struct ttm_placement *placement, u32 domains,
+ struct ttm_bo_device *bdev)
+{
+ struct ttm_heap *heap = container_of(bo, struct ttm_heap, pbo);
+ int cnt = 0, i = 0;
+
+ if (!(domains & TTM_PL_MASK_MEM)) domains = TTM_PL_FLAG_SYSTEM;
+
+ do {
+ int domain = (domains & (1 << i));
+
+ if (domain) {
+ heap->busy_placements[cnt] = (domain | bdev->man[i].default_caching);
+ heap->placements[cnt++] = (domain | bdev->man[i].available_caching);
+ }
+ } while (i++ < TTM_NUM_MEM_TYPES);
+
+ placement->num_busy_placement = placement->num_placement = cnt;
+ placement->busy_placement = heap->busy_placements;
+ placement->placement = heap->placements;
+ placement->fpfn = placement->lpfn = 0;
+}
+
+int
+ttm_bo_allocate(struct ttm_bo_device *bdev,
+ unsigned long size,
+ enum ttm_bo_type origin,
+ uint32_t domains,
+ uint32_t byte_align,
+ uint32_t page_align,
+ bool interruptible,
+ struct sg_table *sg,
+ struct file *persistant_swap_storage,
+ struct ttm_buffer_object **p_bo)
+{
+ unsigned long acc_size = sizeof(struct ttm_heap);
+ struct ttm_buffer_object *bo = NULL;
+ struct ttm_placement placement;
+ struct ttm_heap *heap;
+ int ret = -ENOMEM;
+
+ size = round_up(size, byte_align);
+ size = ALIGN(size, page_align);
+
+ heap = kzalloc(acc_size, GFP_KERNEL);
+ if (unlikely(!heap))
+ return ret;
+
+ bo = &heap->pbo;
+
+ ttm_placement_from_domain(bo, &placement, domains, bdev);
+
+ ret = ttm_bo_init(bdev, bo, size, origin, &placement,
+ page_align >> PAGE_SHIFT,
+ interruptible, persistant_swap_storage,
+ ttm_bo_dma_acc_size(bdev, size, acc_size),
+ sg, ttm_buffer_object_destroy);
+ if (unlikely(ret))
+ kfree(heap);
+ else
+ *p_bo = bo;
+ return ret;
+}
+
+int
+ttm_bo_pin(struct ttm_buffer_object *bo, struct ttm_bo_kmap_obj *kmap)
+{
+ struct ttm_heap *heap = container_of(bo, struct ttm_heap, pbo);
+ struct ttm_placement placement;
+ int ret;
+
+ ret = ttm_bo_reserve(bo, true, false, false, 0);
+ if (!ret) {
+ placement.placement = heap->placements;
+ placement.fpfn = placement.lpfn = 0;
+ placement.num_placement = 1;
+
+ heap->placements[0] = (bo->mem.placement | TTM_PL_FLAG_NO_EVICT);
+ ret = ttm_bo_validate(bo, &placement, false, false);
+ if (!ret && kmap)
+ ret = ttm_bo_kmap(bo, 0, bo->num_pages, kmap);
+ ttm_bo_unreserve(bo);
+ }
+ return ret;
+}
+
+int
+ttm_bo_unpin(struct ttm_buffer_object *bo, struct ttm_bo_kmap_obj *kmap)
+{
+ struct ttm_heap *heap = container_of(bo, struct ttm_heap, pbo);
+ struct ttm_placement placement;
+ int ret;
+
+ ret = ttm_bo_reserve(bo, true, false, false, 0);
+ if (!ret) {
+ if (kmap)
+ ttm_bo_kunmap(kmap);
+
+ placement.placement = heap->placements;
+ placement.fpfn = placement.lpfn = 0;
+ placement.num_placement = 1;
+
+ heap->placements[0] = (bo->mem.placement & ~TTM_PL_FLAG_NO_EVICT);
+ ret = ttm_bo_validate(bo, &placement, false, false);
+ ttm_bo_unreserve(bo);
+ }
+ return ret;
+}
+
+int
+ttm_allocate_kernel_buffer(struct ttm_bo_device *bdev, unsigned long size,
+ uint32_t alignment, uint32_t domain,
+ struct ttm_bo_kmap_obj *kmap)
+{
+ int ret = ttm_bo_allocate(bdev, size, ttm_bo_type_kernel, domain,
+ alignment, PAGE_SIZE, false, NULL,
+ NULL, &kmap->bo);
+ if (likely(!ret)) {
+ ret = ttm_bo_pin(kmap->bo, kmap);
+ if (unlikely(ret)) {
+ DRM_ERROR("failed to mmap the buffer\n");
+ ttm_bo_unref(&kmap->bo);
+ kmap->bo = NULL;
+ }
+ }
+ return ret;
+}
diff --git a/drivers/gpu/drm/via/ttm_gem.c b/drivers/gpu/drm/via/ttm_gem.c
new file mode 100644
index 0000000..4c30b8b
--- /dev/null
+++ b/drivers/gpu/drm/via/ttm_gem.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2012 James Simmons <jsimmons at infradead.org>. All Rights Reserved.
+ *
+ * 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.
+ */
+#include "drmP.h"
+#include "via_drv.h"
+
+/*
+ * initialize the gem buffer object
+ */
+int ttm_gem_init_object(struct drm_gem_object *obj)
+{
+ return 0;
+}
+
+/*
+ * free the gem buffer object
+ */
+void ttm_gem_free_object(struct drm_gem_object *obj)
+{
+ struct ttm_buffer_object *bo = obj->driver_private;
+
+ if (bo) {
+ obj->driver_private = NULL;
+ ttm_bo_unref(&bo);
+ }
+ drm_gem_object_release(obj);
+ kfree(obj);
+}
+
+/*
+ * file operation mmap
+ */
+int ttm_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct drm_via_private *dev_priv;
+ struct drm_file *file_priv;
+
+ if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+ return drm_mmap(filp, vma);
+
+ file_priv = filp->private_data;
+ dev_priv = file_priv->minor->dev->dev_private;
+ if (!dev_priv)
+ return -EINVAL;
+
+ return ttm_bo_mmap(filp, vma, &dev_priv->bdev);
+}
+
+struct drm_gem_object *
+ttm_gem_create(struct drm_device *dev, struct ttm_bo_device *bdev, int types,
+ bool interruptible, int byte_align, int page_align,
+ unsigned long size)
+{
+ struct ttm_buffer_object *bo = NULL;
+ struct drm_gem_object *obj;
+ int ret;
+
+ size = round_up(size, byte_align);
+ size = ALIGN(size, page_align);
+
+ obj = drm_gem_object_alloc(dev, size);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ ret = ttm_bo_allocate(bdev, size, ttm_bo_type_device, types,
+ byte_align, page_align, interruptible,
+ NULL, obj->filp, &bo);
+ if (ret) {
+ DRM_ERROR("Failed to create buffer object\n");
+ drm_gem_object_unreference_unlocked(obj);
+ return ERR_PTR(ret);
+ }
+ obj->driver_private = bo;
+ return obj;
+}
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