[PATCH RFC 18/24] drm/lima: add TTM subsystem functions

[Qiang Yu <yuq825@gmail.com>]

Signed-off-by: Qiang Yu <yuq825@gmail.com>
---
 drivers/gpu/drm/lima/lima_ttm.c | 409 ++++++++++++++++++++++++++++++++
 drivers/gpu/drm/lima/lima_ttm.h |  44 ++++
 2 files changed, 453 insertions(+)
 create mode 100644 drivers/gpu/drm/lima/lima_ttm.c
 create mode 100644 drivers/gpu/drm/lima/lima_ttm.h

diff --git a/drivers/gpu/drm/lima/lima_ttm.c b/drivers/gpu/drm/lima/lima_ttm.c
new file mode 100644
index 000000000000..5325f3f48ae7
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_ttm.c
@@ -0,0 +1,409 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(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 <linux/mm.h>
+#include <drm/ttm/ttm_page_alloc.h>
+
+#include "lima_drv.h"
+#include "lima_device.h"
+#include "lima_object.h"
+
+
+static int lima_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+	return ttm_mem_global_init(ref->object);
+}
+
+static void lima_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+	ttm_mem_global_release(ref->object);
+}
+
+static int lima_ttm_global_init(struct lima_device *dev)
+{
+	struct drm_global_reference *global_ref;
+	int err;
+
+	dev->mman.mem_global_referenced = false;
+	global_ref = &dev->mman.mem_global_ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
+	global_ref->size = sizeof(struct ttm_mem_global);
+	global_ref->init = &lima_ttm_mem_global_init;
+	global_ref->release = &lima_ttm_mem_global_release;
+
+	err = drm_global_item_ref(global_ref);
+	if (err != 0) {
+		dev_err(dev->dev, "Failed setting up TTM memory accounting "
+			"subsystem.\n");
+		return err;
+	}
+
+	dev->mman.bo_global_ref.mem_glob =
+		dev->mman.mem_global_ref.object;
+	global_ref = &dev->mman.bo_global_ref.ref;
+	global_ref->global_type = DRM_GLOBAL_TTM_BO;
+	global_ref->size = sizeof(struct ttm_bo_global);
+	global_ref->init = &ttm_bo_global_init;
+	global_ref->release = &ttm_bo_global_release;
+	err = drm_global_item_ref(global_ref);
+	if (err != 0) {
+		dev_err(dev->dev, "Failed setting up TTM BO subsystem.\n");
+		drm_global_item_unref(&dev->mman.mem_global_ref);
+		return err;
+	}
+
+	dev->mman.mem_global_referenced = true;
+	return 0;
+}
+
+static void lima_ttm_global_fini(struct lima_device *dev)
+{
+	if (dev->mman.mem_global_referenced) {
+		drm_global_item_unref(&dev->mman.bo_global_ref.ref);
+		drm_global_item_unref(&dev->mman.mem_global_ref);
+		dev->mman.mem_global_referenced = false;
+	}
+}
+
+struct lima_tt_mgr {
+	spinlock_t lock;
+	unsigned long available;
+};
+
+static int lima_ttm_bo_man_init(struct ttm_mem_type_manager *man,
+				unsigned long p_size)
+{
+	struct lima_tt_mgr *mgr;
+
+	mgr = kmalloc(sizeof(*mgr), GFP_KERNEL);
+	if (!mgr)
+		return -ENOMEM;
+
+	spin_lock_init(&mgr->lock);
+	mgr->available = p_size;
+	man->priv = mgr;
+	return 0;
+}
+
+static int lima_ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
+{
+	struct lima_tt_mgr *mgr = man->priv;
+
+	kfree(mgr);
+	man->priv = NULL;
+	return 0;
+}
+
+static int lima_ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
+				    struct ttm_buffer_object *bo,
+				    const struct ttm_place *place,
+				    struct ttm_mem_reg *mem)
+{
+	struct lima_tt_mgr *mgr = man->priv;
+
+	/* don't exceed the mem limit */
+	spin_lock(&mgr->lock);
+	if (mgr->available < mem->num_pages) {
+		spin_unlock(&mgr->lock);
+		return 0;
+	}
+	mgr->available -= mem->num_pages;
+	spin_unlock(&mgr->lock);
+
+	/* just fake a non-null pointer to tell caller success */
+	mem->mm_node = (void *)1;
+	return 0;
+}
+
+static void lima_ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
+				     struct ttm_mem_reg *mem)
+{
+	struct lima_tt_mgr *mgr = man->priv;
+
+	spin_lock(&mgr->lock);
+	mgr->available += mem->num_pages;
+	spin_unlock(&mgr->lock);
+
+	mem->mm_node = NULL;
+}
+
+static void lima_ttm_bo_man_debug(struct ttm_mem_type_manager *man,
+				  struct drm_printer *printer)
+{
+}
+
+static const struct ttm_mem_type_manager_func lima_bo_manager_func = {
+	.init = lima_ttm_bo_man_init,
+	.takedown = lima_ttm_bo_man_takedown,
+	.get_node = lima_ttm_bo_man_get_node,
+	.put_node = lima_ttm_bo_man_put_node,
+	.debug = lima_ttm_bo_man_debug
+};
+
+static int lima_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
+			      struct ttm_mem_type_manager *man)
+{
+	struct lima_device *dev = ttm_to_lima_dev(bdev);
+
+	switch (type) {
+	case TTM_PL_SYSTEM:
+		/* System memory */
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	case TTM_PL_TT:
+		man->func = &lima_bo_manager_func;
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	default:
+		dev_err(dev->dev, "Unsupported memory type %u\n",
+			(unsigned int)type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int lima_ttm_backend_bind(struct ttm_tt *ttm,
+				 struct ttm_mem_reg *bo_mem)
+{
+	return 0;
+}
+
+static int lima_ttm_backend_unbind(struct ttm_tt *ttm)
+{
+	return 0;
+}
+
+static void lima_ttm_backend_destroy(struct ttm_tt *ttm)
+{
+	struct lima_ttm_tt *tt = (void *)ttm;
+
+	ttm_dma_tt_fini(&tt->ttm);
+	kfree(tt);
+}
+
+static struct ttm_backend_func lima_ttm_backend_func = {
+	.bind = &lima_ttm_backend_bind,
+	.unbind = &lima_ttm_backend_unbind,
+	.destroy = &lima_ttm_backend_destroy,
+};
+
+static struct ttm_tt *lima_ttm_tt_create(struct ttm_buffer_object *bo,
+					 uint32_t page_flags)
+{
+	struct lima_ttm_tt *tt;
+
+	tt = kzalloc(sizeof(struct lima_ttm_tt), GFP_KERNEL);
+	if (tt == NULL)
+		return NULL;
+
+	tt->ttm.ttm.func = &lima_ttm_backend_func;
+
+	if (ttm_sg_tt_init(&tt->ttm, bo, page_flags)) {
+		kfree(tt);
+		return NULL;
+	}
+
+	return &tt->ttm.ttm;
+}
+
+static int lima_ttm_tt_populate(struct ttm_tt *ttm,
+				struct ttm_operation_ctx *ctx)
+{
+	struct lima_device *dev = ttm_to_lima_dev(ttm->bdev);
+	struct lima_ttm_tt *tt = (void *)ttm;
+	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
+
+	if (slave) {
+		drm_prime_sg_to_page_addr_arrays(ttm->sg, ttm->pages,
+						 tt->ttm.dma_address,
+						 ttm->num_pages);
+		ttm->state = tt_unbound;
+		return 0;
+	}
+
+	return ttm_populate_and_map_pages(dev->dev, &tt->ttm, ctx);
+}
+
+static void lima_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+	struct lima_device *dev = ttm_to_lima_dev(ttm->bdev);
+	struct lima_ttm_tt *tt = (void *)ttm;
+	bool slave = !!(ttm->page_flags & TTM_PAGE_FLAG_SG);
+
+	if (slave)
+		return;
+
+	ttm_unmap_and_unpopulate_pages(dev->dev, &tt->ttm);
+}
+
+static int lima_invalidate_caches(struct ttm_bo_device *bdev,
+				  uint32_t flags)
+{
+	struct lima_device *dev = ttm_to_lima_dev(bdev);
+
+	dev_err(dev->dev, "%s not implemented\n", __FUNCTION__);
+	return 0;
+}
+
+static void lima_evict_flags(struct ttm_buffer_object *tbo,
+			     struct ttm_placement *placement)
+{
+	struct lima_bo *bo = ttm_to_lima_bo(tbo);
+	struct lima_device *dev = to_lima_dev(bo->gem.dev);
+
+	dev_err(dev->dev, "%s not implemented\n", __FUNCTION__);
+}
+
+static int lima_verify_access(struct ttm_buffer_object *tbo,
+			      struct file *filp)
+{
+	struct lima_bo *bo = ttm_to_lima_bo(tbo);
+
+	return drm_vma_node_verify_access(&bo->gem.vma_node,
+					  filp->private_data);
+}
+
+static int lima_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
+				   struct ttm_mem_reg *mem)
+{
+	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
+
+	mem->bus.addr = NULL;
+	mem->bus.offset = 0;
+	mem->bus.size = mem->num_pages << PAGE_SHIFT;
+	mem->bus.base = 0;
+	mem->bus.is_iomem = false;
+
+	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
+		return -EINVAL;
+
+	switch (mem->mem_type) {
+	case TTM_PL_SYSTEM:
+	case TTM_PL_TT:
+		return 0;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void lima_ttm_io_mem_free(struct ttm_bo_device *bdev,
+				 struct ttm_mem_reg *mem)
+{
+
+}
+
+static void lima_bo_move_notify(struct ttm_buffer_object *tbo, bool evict,
+				struct ttm_mem_reg *new_mem)
+{
+	struct lima_bo *bo = ttm_to_lima_bo(tbo);
+	struct lima_device *dev = to_lima_dev(bo->gem.dev);
+
+	if (evict)
+		dev_err(dev->dev, "%s not implemented\n", __FUNCTION__);
+}
+
+static void lima_bo_swap_notify(struct ttm_buffer_object *tbo)
+{
+	struct lima_bo *bo = ttm_to_lima_bo(tbo);
+	struct lima_device *dev = to_lima_dev(bo->gem.dev);
+
+	dev_err(dev->dev, "%s not implemented\n", __FUNCTION__);
+}
+
+static struct ttm_bo_driver lima_bo_driver = {
+	.ttm_tt_create = lima_ttm_tt_create,
+	.ttm_tt_populate = lima_ttm_tt_populate,
+	.ttm_tt_unpopulate = lima_ttm_tt_unpopulate,
+	.invalidate_caches = lima_invalidate_caches,
+	.init_mem_type = lima_init_mem_type,
+	.eviction_valuable = ttm_bo_eviction_valuable,
+	.evict_flags = lima_evict_flags,
+	.verify_access = lima_verify_access,
+	.io_mem_reserve = lima_ttm_io_mem_reserve,
+	.io_mem_free = lima_ttm_io_mem_free,
+	.move_notify = lima_bo_move_notify,
+	.swap_notify = lima_bo_swap_notify,
+};
+
+int lima_ttm_init(struct lima_device *dev)
+{
+	int err;
+	bool need_dma32;
+	u64 gtt_size;
+
+	err = lima_ttm_global_init(dev);
+	if (err)
+		return err;
+
+#if defined(CONFIG_ARM) && !defined(CONFIG_ARM_LPAE)
+	need_dma32 = false;
+#else
+	need_dma32 = true;
+#endif
+
+	err = ttm_bo_device_init(&dev->mman.bdev,
+				 dev->mman.bo_global_ref.ref.object,
+				 &lima_bo_driver,
+				 dev->ddev->anon_inode->i_mapping,
+				 DRM_FILE_PAGE_OFFSET,
+				 need_dma32);
+	if (err) {
+		dev_err(dev->dev, "failed initializing buffer object "
+			"driver(%d).\n", err);
+		goto err_out0;
+	}
+
+	if (lima_max_mem < 0) {
+		struct sysinfo si;
+		si_meminfo(&si);
+		/* TODO: better to have lower 32 mem size */
+		gtt_size = min(((u64)si.totalram * si.mem_unit * 3/4),
+			       0x100000000ULL);
+	}
+	else
+		gtt_size = (u64)lima_max_mem << 20;
+
+	err = ttm_bo_init_mm(&dev->mman.bdev, TTM_PL_TT, gtt_size >> PAGE_SHIFT);
+	if (err) {
+		dev_err(dev->dev, "Failed initializing GTT heap.\n");
+		goto err_out1;
+	}
+	return 0;
+
+err_out1:
+	ttm_bo_device_release(&dev->mman.bdev);
+err_out0:
+	lima_ttm_global_fini(dev);
+	return err;
+}
+
+void lima_ttm_fini(struct lima_device *dev)
+{
+	ttm_bo_device_release(&dev->mman.bdev);
+	lima_ttm_global_fini(dev);
+	dev_info(dev->dev, "ttm finalized\n");
+}
diff --git a/drivers/gpu/drm/lima/lima_ttm.h b/drivers/gpu/drm/lima/lima_ttm.h
new file mode 100644
index 000000000000..1d36d06a47a3
--- /dev/null
+++ b/drivers/gpu/drm/lima/lima_ttm.h
@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2017-2018 Lima Project
+ *
+ * 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, sublicense,
+ * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(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.
+ */
+#ifndef __LIMA_TTM_H__
+#define __LIMA_TTM_H__
+
+#include <drm/ttm/ttm_bo_driver.h>
+
+struct lima_mman {
+	struct ttm_bo_global_ref bo_global_ref;
+	struct drm_global_reference mem_global_ref;
+	struct ttm_bo_device bdev;
+	bool mem_global_referenced;
+};
+
+struct lima_ttm_tt {
+	struct ttm_dma_tt ttm;
+};
+
+struct lima_device;
+struct lima_bo;
+
+int lima_ttm_init(struct lima_device *dev);
+void lima_ttm_fini(struct lima_device *dev);
+
+#endif
-- 
2.17.0

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