--- /dev/null
+/* exynos_drm_gem.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * Author: Inki Dae <inki.dae@samsung.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/drmP.h>
+#include <drm/drm_vma_manager.h>
+
+#include <linux/shmem_fs.h>
+#include <drm/exynos_drm.h>
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_gem.h"
+#include "exynos_drm_buf.h"
+#include "exynos_drm_iommu.h"
+
+static unsigned int convert_to_vm_err_msg(int msg)
+{
+ unsigned int out_msg;
+
+ switch (msg) {
+ case 0:
+ case -ERESTARTSYS:
+ case -EINTR:
+ out_msg = VM_FAULT_NOPAGE;
+ break;
+
+ case -ENOMEM:
+ out_msg = VM_FAULT_OOM;
+ break;
+
+ default:
+ out_msg = VM_FAULT_SIGBUS;
+ break;
+ }
+
+ return out_msg;
+}
+
+static int check_gem_flags(unsigned int flags)
+{
+ if (flags & ~(EXYNOS_BO_MASK)) {
+ DRM_ERROR("invalid flags.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
+ struct vm_area_struct *vma)
+{
+ DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
+
+ /* non-cachable as default. */
+ if (obj->flags & EXYNOS_BO_CACHABLE)
+ vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
+ else if (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));
+}
+
+static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
+{
+ /* TODO */
+
+ return roundup(size, PAGE_SIZE);
+}
+
+static int exynos_drm_gem_map_buf(struct drm_gem_object *obj,
+ struct vm_area_struct *vma,
+ unsigned long f_vaddr,
+ pgoff_t page_offset)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
+ struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
+ struct scatterlist *sgl;
+ unsigned long pfn;
+ int i;
+
+ if (!buf->sgt)
+ return -EINTR;
+
+ if (page_offset >= (buf->size >> PAGE_SHIFT)) {
+ DRM_ERROR("invalid page offset\n");
+ return -EINVAL;
+ }
+
+ sgl = buf->sgt->sgl;
+ for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
+ if (page_offset < (sgl->length >> PAGE_SHIFT))
+ break;
+ page_offset -= (sgl->length >> PAGE_SHIFT);
+ }
+
+ pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
+
+ return vm_insert_mixed(vma, f_vaddr, pfn);
+}
+
+static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
+ struct drm_file *file_priv,
+ unsigned int *handle)
+{
+ int ret;
+
+ /*
+ * allocate a id of idr table where the obj is registered
+ * and handle has the id what user can see.
+ */
+ ret = drm_gem_handle_create(file_priv, obj, handle);
+ if (ret)
+ return ret;
+
+ DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
+
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_unreference_unlocked(obj);
+
+ return 0;
+}
+
+void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
+{
+ struct drm_gem_object *obj;
+ struct exynos_drm_gem_buf *buf;
+
+ obj = &exynos_gem_obj->base;
+ buf = exynos_gem_obj->buffer;
+
+ DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
+
+ /*
+ * do not release memory region from exporter.
+ *
+ * the region will be released by exporter
+ * once dmabuf's refcount becomes 0.
+ */
+ if (obj->import_attach)
+ goto out;
+
+ exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
+
+out:
+ exynos_drm_fini_buf(obj->dev, buf);
+ exynos_gem_obj->buffer = NULL;
+
+ drm_gem_free_mmap_offset(obj);
+
+ /* release file pointer to gem object. */
+ drm_gem_object_release(obj);
+
+ kfree(exynos_gem_obj);
+ exynos_gem_obj = NULL;
+}
+
+unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
+ unsigned int gem_handle,
+ struct drm_file *file_priv)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_gem_object *obj;
+
+ obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ return 0;
+ }
+
+ exynos_gem_obj = to_exynos_gem_obj(obj);
+
+ drm_gem_object_unreference_unlocked(obj);
+
+ return exynos_gem_obj->buffer->size;
+}
+
+
+struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
+ unsigned long size)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_gem_object *obj;
+ int ret;
+
+ exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
+ if (!exynos_gem_obj)
+ return NULL;
+
+ exynos_gem_obj->size = size;
+ obj = &exynos_gem_obj->base;
+
+ ret = drm_gem_object_init(dev, obj, size);
+ if (ret < 0) {
+ DRM_ERROR("failed to initialize gem object\n");
+ kfree(exynos_gem_obj);
+ return NULL;
+ }
+
+ DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
+
+ return exynos_gem_obj;
+}
+
+struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
+ unsigned int flags,
+ unsigned long size)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem_buf *buf;
+ int ret;
+
+ if (!size) {
+ DRM_ERROR("invalid size.\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ size = roundup_gem_size(size, flags);
+
+ ret = check_gem_flags(flags);
+ if (ret)
+ return ERR_PTR(ret);
+
+ buf = exynos_drm_init_buf(dev, size);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ exynos_gem_obj = exynos_drm_gem_init(dev, size);
+ if (!exynos_gem_obj) {
+ ret = -ENOMEM;
+ goto err_fini_buf;
+ }
+
+ exynos_gem_obj->buffer = buf;
+
+ /* set memory type and cache attribute from user side. */
+ exynos_gem_obj->flags = flags;
+
+ ret = exynos_drm_alloc_buf(dev, buf, flags);
+ if (ret < 0)
+ goto err_gem_fini;
+
+ return exynos_gem_obj;
+
+err_gem_fini:
+ drm_gem_object_release(&exynos_gem_obj->base);
+ kfree(exynos_gem_obj);
+err_fini_buf:
+ exynos_drm_fini_buf(dev, buf);
+ return ERR_PTR(ret);
+}
+
+int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_exynos_gem_create *args = data;
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ int ret;
+
+ exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
+ if (IS_ERR(exynos_gem_obj))
+ return PTR_ERR(exynos_gem_obj);
+
+ 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;
+}
+
+dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
+ unsigned int gem_handle,
+ struct drm_file *filp)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_gem_object *obj;
+
+ obj = drm_gem_object_lookup(dev, filp, gem_handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ exynos_gem_obj = to_exynos_gem_obj(obj);
+
+ return &exynos_gem_obj->buffer->dma_addr;
+}
+
+void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
+ unsigned int gem_handle,
+ struct drm_file *filp)
+{
+ struct drm_gem_object *obj;
+
+ obj = drm_gem_object_lookup(dev, filp, gem_handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ return;
+ }
+
+ drm_gem_object_unreference_unlocked(obj);
+
+ /*
+ * decrease obj->refcount one more time because we has already
+ * increased it at exynos_drm_gem_get_dma_addr().
+ */
+ drm_gem_object_unreference_unlocked(obj);
+}
+
+int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
+ struct vm_area_struct *vma)
+{
+ struct drm_device *drm_dev = exynos_gem_obj->base.dev;
+ struct exynos_drm_gem_buf *buffer;
+ unsigned long vm_size;
+ int ret;
+
+ vma->vm_flags &= ~VM_PFNMAP;
+ vma->vm_pgoff = 0;
+
+ vm_size = vma->vm_end - vma->vm_start;
+
+ /*
+ * a buffer contains information to physically continuous memory
+ * allocated by user request or at framebuffer creation.
+ */
+ buffer = exynos_gem_obj->buffer;
+
+ /* check if user-requested size is valid. */
+ if (vm_size > buffer->size)
+ return -EINVAL;
+
+ ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
+ buffer->dma_addr, buffer->size,
+ &buffer->dma_attrs);
+ if (ret < 0) {
+ DRM_ERROR("failed to mmap.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_exynos_gem_info *args = data;
+ struct drm_gem_object *obj;
+
+ mutex_lock(&dev->struct_mutex);
+
+ obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ mutex_unlock(&dev->struct_mutex);
+ return -EINVAL;
+ }
+
+ exynos_gem_obj = to_exynos_gem_obj(obj);
+
+ args->flags = exynos_gem_obj->flags;
+ args->size = exynos_gem_obj->size;
+
+ drm_gem_object_unreference(obj);
+ mutex_unlock(&dev->struct_mutex);
+
+ return 0;
+}
+
+struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
+{
+ struct vm_area_struct *vma_copy;
+
+ vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
+ if (!vma_copy)
+ return NULL;
+
+ if (vma->vm_ops && vma->vm_ops->open)
+ vma->vm_ops->open(vma);
+
+ if (vma->vm_file)
+ get_file(vma->vm_file);
+
+ memcpy(vma_copy, vma, sizeof(*vma));
+
+ vma_copy->vm_mm = NULL;
+ vma_copy->vm_next = NULL;
+ vma_copy->vm_prev = NULL;
+
+ return vma_copy;
+}
+
+void exynos_gem_put_vma(struct vm_area_struct *vma)
+{
+ if (!vma)
+ return;
+
+ if (vma->vm_ops && vma->vm_ops->close)
+ vma->vm_ops->close(vma);
+
+ if (vma->vm_file)
+ fput(vma->vm_file);
+
+ kfree(vma);
+}
+
+int exynos_gem_get_pages_from_userptr(unsigned long start,
+ unsigned int npages,
+ struct page **pages,
+ struct vm_area_struct *vma)
+{
+ int get_npages;
+
+ /* the memory region mmaped with VM_PFNMAP. */
+ if (vma_is_io(vma)) {
+ unsigned int i;
+
+ for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
+ unsigned long pfn;
+ int ret = follow_pfn(vma, start, &pfn);
+ if (ret)
+ return ret;
+
+ pages[i] = pfn_to_page(pfn);
+ }
+
+ if (i != npages) {
+ DRM_ERROR("failed to get user_pages.\n");
+ return -EINVAL;
+ }
+
+ return 0;
+ }
+
+ get_npages = get_user_pages(current, current->mm, start,
+ npages, 1, 1, pages, NULL);
+ get_npages = max(get_npages, 0);
+ if (get_npages != npages) {
+ DRM_ERROR("failed to get user_pages.\n");
+ while (get_npages)
+ put_page(pages[--get_npages]);
+ return -EFAULT;
+ }
+
+ return 0;
+}
+
+void exynos_gem_put_pages_to_userptr(struct page **pages,
+ unsigned int npages,
+ struct vm_area_struct *vma)
+{
+ if (!vma_is_io(vma)) {
+ unsigned int i;
+
+ for (i = 0; i < npages; i++) {
+ set_page_dirty_lock(pages[i]);
+
+ /*
+ * undo the reference we took when populating
+ * the table.
+ */
+ put_page(pages[i]);
+ }
+ }
+}
+
+int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
+ struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+ int nents;
+
+ mutex_lock(&drm_dev->struct_mutex);
+
+ nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
+ if (!nents) {
+ DRM_ERROR("failed to map sgl with dma.\n");
+ mutex_unlock(&drm_dev->struct_mutex);
+ return nents;
+ }
+
+ mutex_unlock(&drm_dev->struct_mutex);
+ return 0;
+}
+
+void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
+ struct sg_table *sgt,
+ enum dma_data_direction dir)
+{
+ dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
+}
+
+void exynos_drm_gem_free_object(struct drm_gem_object *obj)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_gem_buf *buf;
+
+ exynos_gem_obj = to_exynos_gem_obj(obj);
+ buf = exynos_gem_obj->buffer;
+
+ if (obj->import_attach)
+ drm_prime_gem_destroy(obj, buf->sgt);
+
+ exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
+}
+
+int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
+ struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ int ret;
+
+ /*
+ * allocate memory to be used for framebuffer.
+ * - this callback would be called by user application
+ * with DRM_IOCTL_MODE_CREATE_DUMB command.
+ */
+
+ args->pitch = args->width * ((args->bpp + 7) / 8);
+ args->size = args->pitch * args->height;
+
+ if (is_drm_iommu_supported(dev)) {
+ exynos_gem_obj = exynos_drm_gem_create(dev,
+ EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
+ args->size);
+ } else {
+ exynos_gem_obj = exynos_drm_gem_create(dev,
+ EXYNOS_BO_CONTIG | EXYNOS_BO_WC,
+ args->size);
+ }
+
+ if (IS_ERR(exynos_gem_obj)) {
+ dev_warn(dev->dev, "FB allocation failed.\n");
+ return PTR_ERR(exynos_gem_obj);
+ }
+
+ 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 drm_device *dev = obj->dev;
+ unsigned long f_vaddr;
+ pgoff_t page_offset;
+ int ret;
+
+ page_offset = ((unsigned long)vmf->virtual_address -
+ vma->vm_start) >> PAGE_SHIFT;
+ f_vaddr = (unsigned long)vmf->virtual_address;
+
+ mutex_lock(&dev->struct_mutex);
+
+ ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset);
+ if (ret < 0)
+ DRM_ERROR("failed to map a buffer with user.\n");
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return convert_to_vm_err_msg(ret);
+}
+
+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);
+
+ ret = check_gem_flags(exynos_gem_obj->flags);
+ if (ret)
+ goto err_close_vm;
+
+ update_vm_cache_attr(exynos_gem_obj, vma);
+
+ 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;
+}
Code Review / kvmfornfv.git / blobdiff