/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2023 Intel Corporation
 */

#include <linux/fb.h>

#include "intel_fbdev_fb.h"
#include "xe_bo.h"
#include "xe_ttm_stolen_mgr.h"
#include "xe_wa.h"

#include <generated/xe_device_wa_oob.h>

/*
 * FIXME: There shouldn't be any reason to have XE_PAGE_SIZE stride
 * alignment. The same 64 as i915 uses should be fine, and we shouldn't need to
 * have driver specific values. However, dropping the stride alignment to 64
 * leads to underflowing the bo pin count in the atomic cleanup work.
 */
u32 intel_fbdev_fb_pitch_align(u32 stride)
{
        return ALIGN(stride, XE_PAGE_SIZE);
}

struct drm_gem_object *intel_fbdev_fb_bo_create(struct drm_device *drm, int size)
{
        struct xe_device *xe = to_xe_device(drm);
        struct xe_bo *obj;

        obj = ERR_PTR(-ENODEV);

        if (!IS_DGFX(xe) && !XE_DEVICE_WA(xe, 22019338487_display)) {
                obj = xe_bo_create_pin_map_novm(xe, xe_device_get_root_tile(xe),
                                                size,
                                                ttm_bo_type_kernel, XE_BO_FLAG_SCANOUT |
                                                XE_BO_FLAG_STOLEN |
                                                XE_BO_FLAG_GGTT, false);
                if (!IS_ERR(obj))
                        drm_info(&xe->drm, "Allocated fbdev into stolen\n");
                else
                        drm_info(&xe->drm, "Allocated fbdev into stolen failed: %li\n", PTR_ERR(obj));
        }

        if (IS_ERR(obj)) {
                obj = xe_bo_create_pin_map_novm(xe, xe_device_get_root_tile(xe), size,
                                                ttm_bo_type_kernel, XE_BO_FLAG_SCANOUT |
                                                XE_BO_FLAG_VRAM_IF_DGFX(xe_device_get_root_tile(xe)) |
                                                XE_BO_FLAG_GGTT, false);
        }

        if (IS_ERR(obj)) {
                drm_err(&xe->drm, "failed to allocate framebuffer (%pe)\n", obj);
                return ERR_PTR(-ENOMEM);
        }

        return &obj->ttm.base;
}

void intel_fbdev_fb_bo_destroy(struct drm_gem_object *obj)
{
        xe_bo_unpin_map_no_vm(gem_to_xe_bo(obj));
}

int intel_fbdev_fb_fill_info(struct drm_device *drm, struct fb_info *info,
                             struct drm_gem_object *_obj, struct i915_vma *vma)
{
        struct xe_bo *obj = gem_to_xe_bo(_obj);
        struct pci_dev *pdev = to_pci_dev(drm->dev);

        if (!(obj->flags & XE_BO_FLAG_SYSTEM)) {
                if (obj->flags & XE_BO_FLAG_STOLEN)
                        info->fix.smem_start = xe_ttm_stolen_io_offset(obj, 0);
                else
                        info->fix.smem_start =
                                pci_resource_start(pdev, 2) +
                                xe_bo_addr(obj, 0, XE_PAGE_SIZE);

                info->fix.smem_len = obj->ttm.base.size;
        } else {
                /* XXX: Pure fiction, as the BO may not be physically accessible.. */
                info->fix.smem_start = 0;
                info->fix.smem_len = obj->ttm.base.size;
        }
        XE_WARN_ON(iosys_map_is_null(&obj->vmap));

        info->screen_base = obj->vmap.vaddr_iomem;
        info->screen_size = obj->ttm.base.size;

        return 0;
}