drm/hisilicon/hibmc: Add video memory management

Hibmc have 32m video memory which can be accessed through PCIe by host,
we use ttm to manage these memory.

Signed-off-by: Rongrong Zou <zourongrong@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Acked-by: Sean Paul <seanpaul@chromium.org>

1 files changed, 485 insertions, 0 deletions

diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
new file mode 100644
index 000000000000..036d3ac06e54
--- /dev/null
+++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c
@@ -0,0 +1,485 @@
+/* Hisilicon Hibmc SoC drm driver
+ *
+ * Based on the bochs drm driver.
+ *
+ * Copyright (c) 2016 Huawei Limited.
+ *
+ * Author:
+ *	Rongrong Zou <zourongrong@huawei.com>
+ *	Rongrong Zou <zourongrong@gmail.com>
+ *	Jianhua Li <lijianhua@huawei.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <ttm/ttm_page_alloc.h>
+
+#include "hibmc_drm_drv.h"
+
+#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
+
+static inline struct hibmc_drm_private *
+hibmc_bdev(struct ttm_bo_device *bd)
+{
+	return container_of(bd, struct hibmc_drm_private, bdev);
+}
+
+static int
+hibmc_ttm_mem_global_init(struct drm_global_reference *ref)
+{
+	return ttm_mem_global_init(ref->object);
+}
+
+static void
+hibmc_ttm_mem_global_release(struct drm_global_reference *ref)
+{
+	ttm_mem_global_release(ref->object);
+}
+
+static int hibmc_ttm_global_init(struct hibmc_drm_private *hibmc)
+{
+	int ret;
+
+	hibmc->mem_global_ref.global_type = DRM_GLOBAL_TTM_MEM;
+	hibmc->mem_global_ref.size = sizeof(struct ttm_mem_global);
+	hibmc->mem_global_ref.init = &hibmc_ttm_mem_global_init;
+	hibmc->mem_global_ref.release = &hibmc_ttm_mem_global_release;
+	ret = drm_global_item_ref(&hibmc->mem_global_ref);
+	if (ret) {
+		DRM_ERROR("could not get ref on ttm global: %d\n", ret);
+		return ret;
+	}
+
+	hibmc->bo_global_ref.mem_glob =
+		hibmc->mem_global_ref.object;
+	hibmc->bo_global_ref.ref.global_type = DRM_GLOBAL_TTM_BO;
+	hibmc->bo_global_ref.ref.size = sizeof(struct ttm_bo_global);
+	hibmc->bo_global_ref.ref.init = &ttm_bo_global_init;
+	hibmc->bo_global_ref.ref.release = &ttm_bo_global_release;
+	ret = drm_global_item_ref(&hibmc->bo_global_ref.ref);
+	if (ret) {
+		DRM_ERROR("failed setting up TTM BO subsystem: %d\n", ret);
+		drm_global_item_unref(&hibmc->mem_global_ref);
+		return ret;
+	}
+	return 0;
+}
+
+static void
+hibmc_ttm_global_release(struct hibmc_drm_private *hibmc)
+{
+	drm_global_item_unref(&hibmc->bo_global_ref.ref);
+	drm_global_item_unref(&hibmc->mem_global_ref);
+	hibmc->mem_global_ref.release = NULL;
+}
+
+static void hibmc_bo_ttm_destroy(struct ttm_buffer_object *tbo)
+{
+	struct hibmc_bo *bo = container_of(tbo, struct hibmc_bo, bo);
+
+	drm_gem_object_release(&bo->gem);
+	kfree(bo);
+}
+
+static bool hibmc_ttm_bo_is_hibmc_bo(struct ttm_buffer_object *bo)
+{
+	return bo->destroy == &hibmc_bo_ttm_destroy;
+}
+
+static int
+hibmc_bo_init_mem_type(struct ttm_bo_device *bdev, u32 type,
+		       struct ttm_mem_type_manager *man)
+{
+	switch (type) {
+	case TTM_PL_SYSTEM:
+		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_MASK_CACHING;
+		man->default_caching = TTM_PL_FLAG_CACHED;
+		break;
+	case TTM_PL_VRAM:
+		man->func = &ttm_bo_manager_func;
+		man->flags = TTM_MEMTYPE_FLAG_FIXED |
+			TTM_MEMTYPE_FLAG_MAPPABLE;
+		man->available_caching = TTM_PL_FLAG_UNCACHED |
+			TTM_PL_FLAG_WC;
+		man->default_caching = TTM_PL_FLAG_WC;
+		break;
+	default:
+		DRM_ERROR("unsupported memory type %u\n", type);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+void hibmc_ttm_placement(struct hibmc_bo *bo, int domain)
+{
+	u32 count = 0;
+	u32 i;
+
+	bo->placement.placement = bo->placements;
+	bo->placement.busy_placement = bo->placements;
+	if (domain & TTM_PL_FLAG_VRAM)
+		bo->placements[count++].flags = TTM_PL_FLAG_WC |
+			TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_VRAM;
+	if (domain & TTM_PL_FLAG_SYSTEM)
+		bo->placements[count++].flags = TTM_PL_MASK_CACHING |
+			TTM_PL_FLAG_SYSTEM;
+	if (!count)
+		bo->placements[count++].flags = TTM_PL_MASK_CACHING |
+			TTM_PL_FLAG_SYSTEM;
+
+	bo->placement.num_placement = count;
+	bo->placement.num_busy_placement = count;
+	for (i = 0; i < count; i++) {
+		bo->placements[i].fpfn = 0;
+		bo->placements[i].lpfn = 0;
+	}
+}
+
+static void
+hibmc_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
+{
+	struct hibmc_bo *hibmcbo = hibmc_bo(bo);
+
+	if (!hibmc_ttm_bo_is_hibmc_bo(bo))
+		return;
+
+	hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_SYSTEM);
+	*pl = hibmcbo->placement;
+}
+
+static int hibmc_bo_verify_access(struct ttm_buffer_object *bo,
+				  struct file *filp)
+{
+	struct hibmc_bo *hibmcbo = hibmc_bo(bo);
+
+	return drm_vma_node_verify_access(&hibmcbo->gem.vma_node,
+					  filp->private_data);
+}
+
+static int hibmc_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];
+	struct hibmc_drm_private *hibmc = hibmc_bdev(bdev);
+
+	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:
+		/* system memory */
+		return 0;
+	case TTM_PL_VRAM:
+		mem->bus.offset = mem->start << PAGE_SHIFT;
+		mem->bus.base = pci_resource_start(hibmc->dev->pdev, 0);
+		mem->bus.is_iomem = true;
+		break;
+	default:
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static void hibmc_ttm_backend_destroy(struct ttm_tt *tt)
+{
+	ttm_tt_fini(tt);
+	kfree(tt);
+}
+
+static struct ttm_backend_func hibmc_tt_backend_func = {
+	.destroy = &hibmc_ttm_backend_destroy,
+};
+
+static struct ttm_tt *hibmc_ttm_tt_create(struct ttm_bo_device *bdev,
+					  unsigned long size,
+					  u32 page_flags,
+					  struct page *dummy_read_page)
+{
+	struct ttm_tt *tt;
+	int ret;
+
+	tt = kzalloc(sizeof(*tt), GFP_KERNEL);
+	if (!tt) {
+		DRM_ERROR("failed to allocate ttm_tt\n");
+		return NULL;
+	}
+	tt->func = &hibmc_tt_backend_func;
+	ret = ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page);
+	if (ret) {
+		DRM_ERROR("failed to initialize ttm_tt: %d\n", ret);
+		kfree(tt);
+		return NULL;
+	}
+	return tt;
+}
+
+static int hibmc_ttm_tt_populate(struct ttm_tt *ttm)
+{
+	return ttm_pool_populate(ttm);
+}
+
+static void hibmc_ttm_tt_unpopulate(struct ttm_tt *ttm)
+{
+	ttm_pool_unpopulate(ttm);
+}
+
+struct ttm_bo_driver hibmc_bo_driver = {
+	.ttm_tt_create		= hibmc_ttm_tt_create,
+	.ttm_tt_populate	= hibmc_ttm_tt_populate,
+	.ttm_tt_unpopulate	= hibmc_ttm_tt_unpopulate,
+	.init_mem_type		= hibmc_bo_init_mem_type,
+	.evict_flags		= hibmc_bo_evict_flags,
+	.move			= NULL,
+	.verify_access		= hibmc_bo_verify_access,
+	.io_mem_reserve		= &hibmc_ttm_io_mem_reserve,
+	.io_mem_free		= NULL,
+	.lru_tail		= &ttm_bo_default_lru_tail,
+	.swap_lru_tail		= &ttm_bo_default_swap_lru_tail,
+};
+
+int hibmc_mm_init(struct hibmc_drm_private *hibmc)
+{
+	int ret;
+	struct drm_device *dev = hibmc->dev;
+	struct ttm_bo_device *bdev = &hibmc->bdev;
+
+	ret = hibmc_ttm_global_init(hibmc);
+	if (ret)
+		return ret;
+
+	ret = ttm_bo_device_init(&hibmc->bdev,
+				 hibmc->bo_global_ref.ref.object,
+				 &hibmc_bo_driver,
+				 dev->anon_inode->i_mapping,
+				 DRM_FILE_PAGE_OFFSET,
+				 true);
+	if (ret) {
+		hibmc_ttm_global_release(hibmc);
+		DRM_ERROR("error initializing bo driver: %d\n", ret);
+		return ret;
+	}
+
+	ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
+			     hibmc->fb_size >> PAGE_SHIFT);
+	if (ret) {
+		hibmc_ttm_global_release(hibmc);
+		DRM_ERROR("failed ttm VRAM init: %d\n", ret);
+		return ret;
+	}
+
+	hibmc->mm_inited = true;
+	return 0;
+}
+
+void hibmc_mm_fini(struct hibmc_drm_private *hibmc)
+{
+	if (!hibmc->mm_inited)
+		return;
+
+	ttm_bo_device_release(&hibmc->bdev);
+	hibmc_ttm_global_release(hibmc);
+	hibmc->mm_inited = false;
+}
+
+static void hibmc_bo_unref(struct hibmc_bo **bo)
+{
+	struct ttm_buffer_object *tbo;
+
+	if ((*bo) == NULL)
+		return;
+
+	tbo = &((*bo)->bo);
+	ttm_bo_unref(&tbo);
+	*bo = NULL;
+}
+
+int hibmc_bo_create(struct drm_device *dev, int size, int align,
+		    u32 flags, struct hibmc_bo **phibmcbo)
+{
+	struct hibmc_drm_private *hibmc = dev->dev_private;
+	struct hibmc_bo *hibmcbo;
+	size_t acc_size;
+	int ret;
+
+	hibmcbo = kzalloc(sizeof(*hibmcbo), GFP_KERNEL);
+	if (!hibmcbo) {
+		DRM_ERROR("failed to allocate hibmcbo\n");
+		return -ENOMEM;
+	}
+	ret = drm_gem_object_init(dev, &hibmcbo->gem, size);
+	if (ret) {
+		DRM_ERROR("failed to initialize drm gem object: %d\n", ret);
+		kfree(hibmcbo);
+		return ret;
+	}
+
+	hibmcbo->bo.bdev = &hibmc->bdev;
+
+	hibmc_ttm_placement(hibmcbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
+
+	acc_size = ttm_bo_dma_acc_size(&hibmc->bdev, size,
+				       sizeof(struct hibmc_bo));
+
+	ret = ttm_bo_init(&hibmc->bdev, &hibmcbo->bo, size,
+			  ttm_bo_type_device, &hibmcbo->placement,
+			  align >> PAGE_SHIFT, false, NULL, acc_size,
+			  NULL, NULL, hibmc_bo_ttm_destroy);
+	if (ret) {
+		hibmc_bo_unref(&hibmcbo);
+		DRM_ERROR("failed to initialize ttm_bo: %d\n", ret);
+		return ret;
+	}
+
+	*phibmcbo = hibmcbo;
+	return 0;
+}
+
+int hibmc_bo_pin(struct hibmc_bo *bo, u32 pl_flag, u64 *gpu_addr)
+{
+	int i, ret;
+
+	if (bo->pin_count) {
+		bo->pin_count++;
+		if (gpu_addr)
+			*gpu_addr = bo->bo.offset;
+		return 0;
+	}
+
+	hibmc_ttm_placement(bo, pl_flag);
+	for (i = 0; i < bo->placement.num_placement; i++)
+		bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+	if (ret)
+		return ret;
+
+	bo->pin_count = 1;
+	if (gpu_addr)
+		*gpu_addr = bo->bo.offset;
+	return 0;
+}
+
+int hibmc_bo_unpin(struct hibmc_bo *bo)
+{
+	int i, ret;
+
+	if (!bo->pin_count) {
+		DRM_ERROR("unpin bad %p\n", bo);
+		return 0;
+	}
+	bo->pin_count--;
+	if (bo->pin_count)
+		return 0;
+
+	for (i = 0; i < bo->placement.num_placement ; i++)
+		bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
+	ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
+	if (ret) {
+		DRM_ERROR("validate failed for unpin: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+int hibmc_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct drm_file *file_priv;
+	struct hibmc_drm_private *hibmc;
+
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
+		return -EINVAL;
+
+	file_priv = filp->private_data;
+	hibmc = file_priv->minor->dev->dev_private;
+	return ttm_bo_mmap(filp, vma, &hibmc->bdev);
+}
+
+int hibmc_gem_create(struct drm_device *dev, u32 size, bool iskernel,
+		     struct drm_gem_object **obj)
+{
+	struct hibmc_bo *hibmcbo;
+	int ret;
+
+	*obj = NULL;
+
+	size = PAGE_ALIGN(size);
+	if (size == 0) {
+		DRM_ERROR("error: zero size\n");
+		return -EINVAL;
+	}
+
+	ret = hibmc_bo_create(dev, size, 0, 0, &hibmcbo);
+	if (ret) {
+		if (ret != -ERESTARTSYS)
+			DRM_ERROR("failed to allocate GEM object: %d\n", ret);
+		return ret;
+	}
+	*obj = &hibmcbo->gem;
+	return 0;
+}
+
+int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev,
+		      struct drm_mode_create_dumb *args)
+{
+	struct drm_gem_object *gobj;
+	u32 handle;
+	int ret;
+
+	args->pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 16);
+	args->size = args->pitch * args->height;
+
+	ret = hibmc_gem_create(dev, args->size, false,
+			       &gobj);
+	if (ret) {
+		DRM_ERROR("failed to create GEM object: %d\n", ret);
+		return ret;
+	}
+
+	ret = drm_gem_handle_create(file, gobj, &handle);
+	drm_gem_object_unreference_unlocked(gobj);
+	if (ret) {
+		DRM_ERROR("failed to unreference GEM object: %d\n", ret);
+		return ret;
+	}
+
+	args->handle = handle;
+	return 0;
+}
+
+void hibmc_gem_free_object(struct drm_gem_object *obj)
+{
+	struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj);
+
+	hibmc_bo_unref(&hibmcbo);
+}
+
+static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo)
+{
+	return drm_vma_node_offset_addr(&bo->bo.vma_node);
+}
+
+int hibmc_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
+			   u32 handle, u64 *offset)
+{
+	struct drm_gem_object *obj;
+	struct hibmc_bo *bo;
+
+	obj = drm_gem_object_lookup(file, handle);
+	if (!obj)
+		return -ENOENT;
+
+	bo = gem_to_hibmc_bo(obj);
+	*offset = hibmc_bo_mmap_offset(bo);
+
+	drm_gem_object_unreference_unlocked(obj);
+	return 0;
+}