mirror of https://gitee.com/openkylin/linux.git
720 lines
16 KiB
C
720 lines
16 KiB
C
/* exynos_drm_gem.c
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* Author: Inki Dae <inki.dae@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <drm/drmP.h>
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#include <drm/drm_vma_manager.h>
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#include <linux/shmem_fs.h>
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#include <linux/dma-buf.h>
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#include <drm/exynos_drm.h>
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#include "exynos_drm_drv.h"
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#include "exynos_drm_gem.h"
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#include "exynos_drm_iommu.h"
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static int exynos_drm_alloc_buf(struct exynos_drm_gem_obj *obj)
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{
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struct drm_device *dev = obj->base.dev;
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enum dma_attr attr;
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unsigned int nr_pages;
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if (obj->dma_addr) {
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DRM_DEBUG_KMS("already allocated.\n");
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return 0;
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}
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init_dma_attrs(&obj->dma_attrs);
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/*
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* if EXYNOS_BO_CONTIG, fully physically contiguous memory
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* region will be allocated else physically contiguous
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* as possible.
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*/
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if (!(obj->flags & EXYNOS_BO_NONCONTIG))
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dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &obj->dma_attrs);
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/*
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* if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping
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* else cachable mapping.
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*/
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if (obj->flags & EXYNOS_BO_WC || !(obj->flags & EXYNOS_BO_CACHABLE))
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attr = DMA_ATTR_WRITE_COMBINE;
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else
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attr = DMA_ATTR_NON_CONSISTENT;
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dma_set_attr(attr, &obj->dma_attrs);
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dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &obj->dma_attrs);
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nr_pages = obj->size >> PAGE_SHIFT;
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if (!is_drm_iommu_supported(dev)) {
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dma_addr_t start_addr;
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unsigned int i = 0;
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obj->pages = drm_calloc_large(nr_pages, sizeof(struct page *));
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if (!obj->pages) {
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DRM_ERROR("failed to allocate pages.\n");
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return -ENOMEM;
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}
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obj->cookie = dma_alloc_attrs(dev->dev,
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obj->size,
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&obj->dma_addr, GFP_KERNEL,
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&obj->dma_attrs);
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if (!obj->cookie) {
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DRM_ERROR("failed to allocate buffer.\n");
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drm_free_large(obj->pages);
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return -ENOMEM;
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}
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start_addr = obj->dma_addr;
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while (i < nr_pages) {
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obj->pages[i] = phys_to_page(start_addr);
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start_addr += PAGE_SIZE;
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i++;
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}
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} else {
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obj->pages = dma_alloc_attrs(dev->dev, obj->size,
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&obj->dma_addr, GFP_KERNEL,
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&obj->dma_attrs);
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if (!obj->pages) {
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DRM_ERROR("failed to allocate buffer.\n");
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return -ENOMEM;
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}
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}
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DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
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(unsigned long)obj->dma_addr,
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obj->size);
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return 0;
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}
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static void exynos_drm_free_buf(struct exynos_drm_gem_obj *obj)
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{
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struct drm_device *dev = obj->base.dev;
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if (!obj->dma_addr) {
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DRM_DEBUG_KMS("dma_addr is invalid.\n");
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return;
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}
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DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n",
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(unsigned long)obj->dma_addr, obj->size);
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if (!is_drm_iommu_supported(dev)) {
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dma_free_attrs(dev->dev, obj->size, obj->cookie,
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(dma_addr_t)obj->dma_addr, &obj->dma_attrs);
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drm_free_large(obj->pages);
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} else
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dma_free_attrs(dev->dev, obj->size, obj->pages,
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(dma_addr_t)obj->dma_addr, &obj->dma_attrs);
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obj->dma_addr = (dma_addr_t)NULL;
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}
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static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
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struct drm_file *file_priv,
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unsigned int *handle)
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{
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int ret;
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/*
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* allocate a id of idr table where the obj is registered
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* and handle has the id what user can see.
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*/
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ret = drm_gem_handle_create(file_priv, obj, handle);
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if (ret)
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return ret;
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DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_unreference_unlocked(obj);
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return 0;
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}
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void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
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{
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struct drm_gem_object *obj = &exynos_gem_obj->base;
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DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
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/*
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* do not release memory region from exporter.
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*
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* the region will be released by exporter
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* once dmabuf's refcount becomes 0.
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*/
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if (obj->import_attach)
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goto out;
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exynos_drm_free_buf(exynos_gem_obj);
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out:
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drm_gem_free_mmap_offset(obj);
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/* release file pointer to gem object. */
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drm_gem_object_release(obj);
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kfree(exynos_gem_obj);
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exynos_gem_obj = NULL;
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}
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unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
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unsigned int gem_handle,
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struct drm_file *file_priv)
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{
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struct exynos_drm_gem_obj *exynos_gem_obj;
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struct drm_gem_object *obj;
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obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
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if (!obj) {
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DRM_ERROR("failed to lookup gem object.\n");
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return 0;
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}
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exynos_gem_obj = to_exynos_gem_obj(obj);
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drm_gem_object_unreference_unlocked(obj);
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return exynos_gem_obj->size;
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}
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struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
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unsigned long size)
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{
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struct exynos_drm_gem_obj *exynos_gem_obj;
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struct drm_gem_object *obj;
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int ret;
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exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
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if (!exynos_gem_obj)
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return ERR_PTR(-ENOMEM);
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exynos_gem_obj->size = size;
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obj = &exynos_gem_obj->base;
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ret = drm_gem_object_init(dev, obj, size);
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if (ret < 0) {
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DRM_ERROR("failed to initialize gem object\n");
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kfree(exynos_gem_obj);
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return ERR_PTR(ret);
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}
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DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
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return exynos_gem_obj;
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}
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struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
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unsigned int flags,
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unsigned long size)
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{
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struct exynos_drm_gem_obj *exynos_gem_obj;
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int ret;
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if (flags & ~(EXYNOS_BO_MASK)) {
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DRM_ERROR("invalid flags.\n");
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return ERR_PTR(-EINVAL);
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}
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if (!size) {
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DRM_ERROR("invalid size.\n");
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return ERR_PTR(-EINVAL);
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}
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size = roundup(size, PAGE_SIZE);
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exynos_gem_obj = exynos_drm_gem_init(dev, size);
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if (IS_ERR(exynos_gem_obj))
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return exynos_gem_obj;
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/* set memory type and cache attribute from user side. */
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exynos_gem_obj->flags = flags;
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ret = exynos_drm_alloc_buf(exynos_gem_obj);
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if (ret < 0) {
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drm_gem_object_release(&exynos_gem_obj->base);
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kfree(exynos_gem_obj);
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return ERR_PTR(ret);
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}
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return exynos_gem_obj;
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}
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int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{
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struct drm_exynos_gem_create *args = data;
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struct exynos_drm_gem_obj *exynos_gem_obj;
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int ret;
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exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
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if (IS_ERR(exynos_gem_obj))
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return PTR_ERR(exynos_gem_obj);
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ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
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&args->handle);
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if (ret) {
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exynos_drm_gem_destroy(exynos_gem_obj);
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return ret;
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}
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return 0;
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}
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dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
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unsigned int gem_handle,
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struct drm_file *filp)
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{
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struct exynos_drm_gem_obj *exynos_gem_obj;
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struct drm_gem_object *obj;
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obj = drm_gem_object_lookup(dev, filp, gem_handle);
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if (!obj) {
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DRM_ERROR("failed to lookup gem object.\n");
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return ERR_PTR(-EINVAL);
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}
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exynos_gem_obj = to_exynos_gem_obj(obj);
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return &exynos_gem_obj->dma_addr;
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}
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void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
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unsigned int gem_handle,
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struct drm_file *filp)
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{
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struct drm_gem_object *obj;
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obj = drm_gem_object_lookup(dev, filp, gem_handle);
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if (!obj) {
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DRM_ERROR("failed to lookup gem object.\n");
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return;
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}
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drm_gem_object_unreference_unlocked(obj);
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/*
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* decrease obj->refcount one more time because we has already
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* increased it at exynos_drm_gem_get_dma_addr().
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*/
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drm_gem_object_unreference_unlocked(obj);
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}
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int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
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struct vm_area_struct *vma)
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{
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struct drm_device *drm_dev = exynos_gem_obj->base.dev;
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unsigned long vm_size;
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int ret;
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_pgoff = 0;
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vm_size = vma->vm_end - vma->vm_start;
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/* check if user-requested size is valid. */
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if (vm_size > exynos_gem_obj->size)
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return -EINVAL;
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ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem_obj->pages,
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exynos_gem_obj->dma_addr, exynos_gem_obj->size,
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&exynos_gem_obj->dma_attrs);
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if (ret < 0) {
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DRM_ERROR("failed to mmap.\n");
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return ret;
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}
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return 0;
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}
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int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file_priv)
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{ struct exynos_drm_gem_obj *exynos_gem_obj;
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struct drm_exynos_gem_info *args = data;
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struct drm_gem_object *obj;
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mutex_lock(&dev->struct_mutex);
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obj = drm_gem_object_lookup(dev, file_priv, args->handle);
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if (!obj) {
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DRM_ERROR("failed to lookup gem object.\n");
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mutex_unlock(&dev->struct_mutex);
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return -EINVAL;
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}
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exynos_gem_obj = to_exynos_gem_obj(obj);
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args->flags = exynos_gem_obj->flags;
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args->size = exynos_gem_obj->size;
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drm_gem_object_unreference(obj);
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mutex_unlock(&dev->struct_mutex);
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return 0;
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}
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struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
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{
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struct vm_area_struct *vma_copy;
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vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
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if (!vma_copy)
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return NULL;
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if (vma->vm_ops && vma->vm_ops->open)
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vma->vm_ops->open(vma);
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if (vma->vm_file)
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get_file(vma->vm_file);
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memcpy(vma_copy, vma, sizeof(*vma));
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vma_copy->vm_mm = NULL;
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vma_copy->vm_next = NULL;
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vma_copy->vm_prev = NULL;
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return vma_copy;
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}
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void exynos_gem_put_vma(struct vm_area_struct *vma)
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{
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if (!vma)
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return;
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if (vma->vm_ops && vma->vm_ops->close)
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vma->vm_ops->close(vma);
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if (vma->vm_file)
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fput(vma->vm_file);
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kfree(vma);
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}
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int exynos_gem_get_pages_from_userptr(unsigned long start,
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unsigned int npages,
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struct page **pages,
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struct vm_area_struct *vma)
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{
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int get_npages;
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/* the memory region mmaped with VM_PFNMAP. */
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if (vma_is_io(vma)) {
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unsigned int i;
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for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
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unsigned long pfn;
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int ret = follow_pfn(vma, start, &pfn);
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if (ret)
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return ret;
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pages[i] = pfn_to_page(pfn);
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}
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if (i != npages) {
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DRM_ERROR("failed to get user_pages.\n");
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return -EINVAL;
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}
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return 0;
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}
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get_npages = get_user_pages(current, current->mm, start,
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npages, 1, 1, pages, NULL);
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get_npages = max(get_npages, 0);
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if (get_npages != npages) {
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DRM_ERROR("failed to get user_pages.\n");
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while (get_npages)
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put_page(pages[--get_npages]);
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return -EFAULT;
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}
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return 0;
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}
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void exynos_gem_put_pages_to_userptr(struct page **pages,
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unsigned int npages,
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struct vm_area_struct *vma)
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{
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if (!vma_is_io(vma)) {
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unsigned int i;
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for (i = 0; i < npages; i++) {
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set_page_dirty_lock(pages[i]);
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/*
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* undo the reference we took when populating
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* the table.
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*/
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put_page(pages[i]);
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}
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}
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}
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int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
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struct sg_table *sgt,
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enum dma_data_direction dir)
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{
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int nents;
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mutex_lock(&drm_dev->struct_mutex);
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nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
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if (!nents) {
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DRM_ERROR("failed to map sgl with dma.\n");
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mutex_unlock(&drm_dev->struct_mutex);
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return nents;
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}
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mutex_unlock(&drm_dev->struct_mutex);
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return 0;
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}
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void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
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struct sg_table *sgt,
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enum dma_data_direction dir)
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{
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dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
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}
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void exynos_drm_gem_free_object(struct drm_gem_object *obj)
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{
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exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
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}
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int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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struct exynos_drm_gem_obj *exynos_gem_obj;
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int ret;
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/*
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* allocate memory to be used for framebuffer.
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* - this callback would be called by user application
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* with DRM_IOCTL_MODE_CREATE_DUMB command.
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*/
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args->pitch = args->width * ((args->bpp + 7) / 8);
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args->size = args->pitch * args->height;
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if (is_drm_iommu_supported(dev)) {
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exynos_gem_obj = exynos_drm_gem_create(dev,
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EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
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args->size);
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} else {
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exynos_gem_obj = exynos_drm_gem_create(dev,
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EXYNOS_BO_CONTIG | EXYNOS_BO_WC,
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args->size);
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}
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if (IS_ERR(exynos_gem_obj)) {
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dev_warn(dev->dev, "FB allocation failed.\n");
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return PTR_ERR(exynos_gem_obj);
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}
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ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
|
|
&args->handle);
|
|
if (ret) {
|
|
exynos_drm_gem_destroy(exynos_gem_obj);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
|
|
struct drm_device *dev, uint32_t handle,
|
|
uint64_t *offset)
|
|
{
|
|
struct drm_gem_object *obj;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&dev->struct_mutex);
|
|
|
|
/*
|
|
* get offset of memory allocated for drm framebuffer.
|
|
* - this callback would be called by user application
|
|
* with DRM_IOCTL_MODE_MAP_DUMB command.
|
|
*/
|
|
|
|
obj = drm_gem_object_lookup(dev, file_priv, handle);
|
|
if (!obj) {
|
|
DRM_ERROR("failed to lookup gem object.\n");
|
|
ret = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
ret = drm_gem_create_mmap_offset(obj);
|
|
if (ret)
|
|
goto out;
|
|
|
|
*offset = drm_vma_node_offset_addr(&obj->vma_node);
|
|
DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
|
|
|
|
out:
|
|
drm_gem_object_unreference(obj);
|
|
unlock:
|
|
mutex_unlock(&dev->struct_mutex);
|
|
return ret;
|
|
}
|
|
|
|
int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
|
|
unsigned long pfn;
|
|
pgoff_t page_offset;
|
|
int ret;
|
|
|
|
page_offset = ((unsigned long)vmf->virtual_address -
|
|
vma->vm_start) >> PAGE_SHIFT;
|
|
|
|
if (page_offset >= (exynos_gem_obj->size >> PAGE_SHIFT)) {
|
|
DRM_ERROR("invalid page offset\n");
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
pfn = page_to_pfn(exynos_gem_obj->pages[page_offset]);
|
|
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
|
|
|
|
out:
|
|
switch (ret) {
|
|
case 0:
|
|
case -ERESTARTSYS:
|
|
case -EINTR:
|
|
return VM_FAULT_NOPAGE;
|
|
case -ENOMEM:
|
|
return VM_FAULT_OOM;
|
|
default:
|
|
return VM_FAULT_SIGBUS;
|
|
}
|
|
}
|
|
|
|
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
struct exynos_drm_gem_obj *exynos_gem_obj;
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
/* set vm_area_struct. */
|
|
ret = drm_gem_mmap(filp, vma);
|
|
if (ret < 0) {
|
|
DRM_ERROR("failed to mmap.\n");
|
|
return ret;
|
|
}
|
|
|
|
obj = vma->vm_private_data;
|
|
exynos_gem_obj = to_exynos_gem_obj(obj);
|
|
|
|
DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem_obj->flags);
|
|
|
|
/* non-cachable as default. */
|
|
if (exynos_gem_obj->flags & EXYNOS_BO_CACHABLE)
|
|
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
|
|
else if (exynos_gem_obj->flags & EXYNOS_BO_WC)
|
|
vma->vm_page_prot =
|
|
pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
|
|
else
|
|
vma->vm_page_prot =
|
|
pgprot_noncached(vm_get_page_prot(vma->vm_flags));
|
|
|
|
ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma);
|
|
if (ret)
|
|
goto err_close_vm;
|
|
|
|
return ret;
|
|
|
|
err_close_vm:
|
|
drm_gem_vm_close(vma);
|
|
drm_gem_free_mmap_offset(obj);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* low-level interface prime helpers */
|
|
struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
|
|
{
|
|
struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
|
|
int npages;
|
|
|
|
npages = exynos_gem_obj->size >> PAGE_SHIFT;
|
|
|
|
return drm_prime_pages_to_sg(exynos_gem_obj->pages, npages);
|
|
}
|
|
|
|
struct drm_gem_object *
|
|
exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
|
|
struct dma_buf_attachment *attach,
|
|
struct sg_table *sgt)
|
|
{
|
|
struct exynos_drm_gem_obj *exynos_gem_obj;
|
|
int npages;
|
|
int ret;
|
|
|
|
exynos_gem_obj = exynos_drm_gem_init(dev, attach->dmabuf->size);
|
|
if (IS_ERR(exynos_gem_obj)) {
|
|
ret = PTR_ERR(exynos_gem_obj);
|
|
goto err;
|
|
}
|
|
|
|
exynos_gem_obj->dma_addr = sg_dma_address(sgt->sgl);
|
|
|
|
npages = exynos_gem_obj->size >> PAGE_SHIFT;
|
|
exynos_gem_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
|
|
if (!exynos_gem_obj->pages) {
|
|
ret = -ENOMEM;
|
|
goto err;
|
|
}
|
|
|
|
ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem_obj->pages, NULL,
|
|
npages);
|
|
if (ret < 0)
|
|
goto err_free_large;
|
|
|
|
if (sgt->nents == 1) {
|
|
/* always physically continuous memory if sgt->nents is 1. */
|
|
exynos_gem_obj->flags |= EXYNOS_BO_CONTIG;
|
|
} else {
|
|
/*
|
|
* this case could be CONTIG or NONCONTIG type but for now
|
|
* sets NONCONTIG.
|
|
* TODO. we have to find a way that exporter can notify
|
|
* the type of its own buffer to importer.
|
|
*/
|
|
exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG;
|
|
}
|
|
|
|
return &exynos_gem_obj->base;
|
|
|
|
err_free_large:
|
|
drm_free_large(exynos_gem_obj->pages);
|
|
err:
|
|
drm_gem_object_release(&exynos_gem_obj->base);
|
|
kfree(exynos_gem_obj);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
|
|
{
|
|
/* Nothing to do */
|
|
}
|