/* SPDX-License-Identifier: MIT */
/*
 * Copyright © 2021 Intel Corporation
 */

#include <drm/drm_framebuffer.h>
#include <drm/drm_print.h>

#include "gem/i915_gem_object.h"

#include "i915_drv.h"
#include "intel_display_core.h"
#include "intel_display_types.h"
#include "intel_fb.h"
#include "intel_fb_bo.h"

void intel_fb_bo_framebuffer_fini(struct drm_gem_object *obj)
{
        /* Nothing to do for i915 */
}

int intel_fb_bo_framebuffer_init(struct drm_gem_object *_obj,
                                 struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_i915_gem_object *obj = to_intel_bo(_obj);
        struct intel_display *display = to_intel_display(obj->base.dev);
        unsigned int tiling, stride;

        i915_gem_object_lock(obj, NULL);
        tiling = i915_gem_object_get_tiling(obj);
        stride = i915_gem_object_get_stride(obj);
        i915_gem_object_unlock(obj);

        if (mode_cmd->flags & DRM_MODE_FB_MODIFIERS) {
                /*
                 * If there's a fence, enforce that
                 * the fb modifier and tiling mode match.
                 */
                if (tiling != I915_TILING_NONE &&
                    tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
                        drm_dbg_kms(display->drm,
                                    "tiling_mode doesn't match fb modifier\n");
                        return -EINVAL;
                }
        } else {
                if (tiling == I915_TILING_X) {
                        mode_cmd->modifier[0] = I915_FORMAT_MOD_X_TILED;
                } else if (tiling == I915_TILING_Y) {
                        drm_dbg_kms(display->drm,
                                    "No Y tiling for legacy addfb\n");
                        return -EINVAL;
                }
        }

        /*
         * gen2/3 display engine uses the fence if present,
         * so the tiling mode must match the fb modifier exactly.
         */
        if (DISPLAY_VER(display) < 4 &&
            tiling != intel_fb_modifier_to_tiling(mode_cmd->modifier[0])) {
                drm_dbg_kms(display->drm,
                            "tiling_mode must match fb modifier exactly on gen2/3\n");
                return -EINVAL;
        }

        /*
         * If there's a fence, enforce that
         * the fb pitch and fence stride match.
         */
        if (tiling != I915_TILING_NONE && mode_cmd->pitches[0] != stride) {
                drm_dbg_kms(display->drm,
                            "pitch (%d) must match tiling stride (%d)\n",
                            mode_cmd->pitches[0], stride);
                return -EINVAL;
        }

        return 0;
}

struct drm_gem_object *
intel_fb_bo_lookup_valid_bo(struct drm_device *drm,
                            struct drm_file *filp,
                            const struct drm_mode_fb_cmd2 *mode_cmd)
{
        struct drm_i915_private *i915 = to_i915(drm);
        struct drm_i915_gem_object *obj;

        obj = i915_gem_object_lookup(filp, mode_cmd->handles[0]);
        if (!obj)
                return ERR_PTR(-ENOENT);

        /* object is backed with LMEM for discrete */
        if (HAS_LMEM(i915) && !i915_gem_object_can_migrate(obj, INTEL_REGION_LMEM_0)) {
                /* object is "remote", not in local memory */
                i915_gem_object_put(obj);
                drm_dbg_kms(&i915->drm, "framebuffer must reside in local memory\n");
                return ERR_PTR(-EREMOTE);
        }

        return intel_bo_to_drm_bo(obj);
}