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Release 4.11 drivers/gpu/drm/hisilicon/hibmc/hibmc_ttm.c

/* 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 <drm/drm_atomic_helper.h>
#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); }

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static int hibmc_ttm_mem_global_init(struct drm_global_reference *ref) { return ttm_mem_global_init(ref->object); }

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static void hibmc_ttm_mem_global_release(struct drm_global_reference *ref) { ttm_mem_global_release(ref->object); }

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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; }

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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; }

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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); }

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static bool hibmc_ttm_bo_is_hibmc_bo(struct ttm_buffer_object *bo) { return bo->destroy == &hibmc_bo_ttm_destroy; }

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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; }

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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; } }

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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; }

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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); }

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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; }

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static void hibmc_ttm_backend_destroy(struct ttm_tt *tt) { ttm_tt_fini(tt); kfree(tt); }

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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; }

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static int hibmc_ttm_tt_populate(struct ttm_tt *ttm) { return ttm_pool_populate(ttm); }

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static void hibmc_ttm_tt_unpopulate(struct ttm_tt *ttm) { ttm_pool_unpopulate(ttm); }

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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, };
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; }

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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; }

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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; }

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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; }

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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; }

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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; }

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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); }

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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; }

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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; }

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void hibmc_gem_free_object(struct drm_gem_object *obj) { struct hibmc_bo *hibmcbo = gem_to_hibmc_bo(obj); hibmc_bo_unref(&hibmcbo); }

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static u64 hibmc_bo_mmap_offset(struct hibmc_bo *bo) { return drm_vma_node_offset_addr(&bo->bo.vma_node); }

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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; }

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static void hibmc_user_framebuffer_destroy(struct drm_framebuffer *fb) { struct hibmc_framebuffer *hibmc_fb = to_hibmc_framebuffer(fb); drm_gem_object_unreference_unlocked(hibmc_fb->obj); drm_framebuffer_cleanup(fb); kfree(hibmc_fb); }

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static const struct drm_framebuffer_funcs hibmc_fb_funcs = { .destroy = hibmc_user_framebuffer_destroy, };
struct hibmc_framebuffer * hibmc_framebuffer_init(struct drm_device *dev, const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object *obj) { struct hibmc_framebuffer *hibmc_fb; int ret; hibmc_fb = kzalloc(sizeof(*hibmc_fb), GFP_KERNEL); if (!hibmc_fb) { DRM_ERROR("failed to allocate hibmc_fb\n"); return ERR_PTR(-ENOMEM); } drm_helper_mode_fill_fb_struct(dev, &hibmc_fb->fb, mode_cmd); hibmc_fb->obj = obj; ret = drm_framebuffer_init(dev, &hibmc_fb->fb, &hibmc_fb_funcs); if (ret) { DRM_ERROR("drm_framebuffer_init failed: %d\n", ret); kfree(hibmc_fb); return ERR_PTR(ret); } return hibmc_fb; }

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static struct drm_framebuffer * hibmc_user_framebuffer_create(struct drm_device *dev, struct drm_file *filp, const struct drm_mode_fb_cmd2 *mode_cmd) { struct drm_gem_object *obj; struct hibmc_framebuffer *hibmc_fb; DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n", mode_cmd->width, mode_cmd->height, (mode_cmd->pixel_format) & 0xff, (mode_cmd->pixel_format >> 8) & 0xff, (mode_cmd->pixel_format >> 16) & 0xff, (mode_cmd->pixel_format >> 24) & 0xff); obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]); if (!obj) return ERR_PTR(-ENOENT); hibmc_fb = hibmc_framebuffer_init(dev, mode_cmd, obj); if (IS_ERR(hibmc_fb)) { drm_gem_object_unreference_unlocked(obj); return ERR_PTR((long)hibmc_fb); } return &hibmc_fb->fb; }

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const struct drm_mode_config_funcs hibmc_mode_funcs = { .atomic_check = drm_atomic_helper_check, .atomic_commit = drm_atomic_helper_commit, .fb_create = hibmc_user_framebuffer_create, };

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