}
static struct sg_table *prime_get_sg_table(struct drm_gem_object *obj)
{
- return NULL;
+ struct xen_drm_front_drm_info *drm_info;
+
+ drm_info = obj->dev->dev_private;
+ return drm_info->gem_ops->prime_get_sg_table(obj);
}
static struct drm_gem_object *prime_import_sg_table(struct drm_device *dev,
struct dma_buf_attachment *attach, struct sg_table *sgt)
{
- return NULL;
+ struct xen_drm_front_drm_info *drm_info;
+
+ drm_info = dev->dev_private;
+ return drm_info->gem_ops->prime_import_sg_table(dev, attach, sgt);
}
static void *prime_vmap(struct drm_gem_object *obj)
{
- return NULL;
+ struct xen_drm_front_drm_info *drm_info;
+
+ drm_info = obj->dev->dev_private;
+ return drm_info->gem_ops->prime_vmap(obj);
}
static void prime_vunmap(struct drm_gem_object *obj, void *vaddr)
{
+ struct xen_drm_front_drm_info *drm_info;
+
+ drm_info = obj->dev->dev_private;
+ drm_info->gem_ops->prime_vunmap(obj, vaddr);
}
static int prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
{
- return -EINVAL;
+ struct xen_drm_front_drm_info *drm_info;
+
+ drm_info = obj->dev->dev_private;
+ return drm_info->gem_ops->prime_mmap(obj, vma);
}
static const struct file_operations xendrm_fops = {
@@ -147,6 +214,7 @@ int xen_drm_front_drv_probe(struct platform_device *pdev,
drm_info->front_ops = front_ops;
drm_info->front_ops->on_frame_done = on_frame_done;
+ drm_info->gem_ops = xen_drm_front_gem_get_ops();
drm_info->front_info = cfg->front_info;
dev = drm_dev_alloc(&xen_drm_driver, &pdev->dev);
diff --git a/drivers/gpu/drm/xen/xen_drm_front_drv.h b/drivers/gpu/drm/xen/xen_drm_front_drv.h
index 563318b19f34..34228eb86255 100644
--- a/drivers/gpu/drm/xen/xen_drm_front_drv.h
+++ b/drivers/gpu/drm/xen/xen_drm_front_drv.h
@@ -43,6 +43,7 @@ struct xen_drm_front_drm_pipeline {
struct xen_drm_front_drm_info {
struct xen_drm_front_info *front_info;
struct xen_drm_front_ops *front_ops;
+ const struct xen_drm_front_gem_ops *gem_ops;
struct drm_device *drm_dev;
struct xen_drm_front_cfg *cfg;
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.c b/drivers/gpu/drm/xen/xen_drm_front_gem.c
new file mode 100644
index 000000000000..367e08f6a9ef
--- /dev/null
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.c
@@ -0,0 +1,360 @@
+/*
+ * Xen para-virtual DRM device
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2016-2018 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
+ */
+
+#include "xen_drm_front_gem.h"
+
+#include <drm/drmP.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem.h>
+
+#include <linux/dma-buf.h>
+#include <linux/scatterlist.h>
+#include <linux/shmem_fs.h>
+
+#include <xen/balloon.h>
+
+#include "xen_drm_front.h"
+#include "xen_drm_front_drv.h"
+#include "xen_drm_front_shbuf.h"
+
+struct xen_gem_object {
+ struct drm_gem_object base;
+
+ size_t num_pages;
+ struct page **pages;
+
+ /* set for buffers allocated by the backend */
+ bool be_alloc;
+
+ /* this is for imported PRIME buffer */
+ struct sg_table *sgt_imported;
+};
+
+static inline struct xen_gem_object *to_xen_gem_obj(
+ struct drm_gem_object *gem_obj)
+{
+ return container_of(gem_obj, struct xen_gem_object, base);
+}
+
+static int gem_alloc_pages_array(struct xen_gem_object *xen_obj,
+ size_t buf_size)
+{
+ xen_obj->num_pages = DIV_ROUND_UP(buf_size, PAGE_SIZE);
+ xen_obj->pages = kvmalloc_array(xen_obj->num_pages,
+ sizeof(struct page *), GFP_KERNEL);
+ return xen_obj->pages == NULL ? -ENOMEM : 0;
+}
+
+static void gem_free_pages_array(struct xen_gem_object *xen_obj)
+{
+ kvfree(xen_obj->pages);
+ xen_obj->pages = NULL;
+}
+
+static struct xen_gem_object *gem_create_obj(struct drm_device *dev,
+ size_t size)
+{
+ struct xen_gem_object *xen_obj;
+ int ret;
+
+ xen_obj = kzalloc(sizeof(*xen_obj), GFP_KERNEL);
+ if (!xen_obj)
+ return ERR_PTR(-ENOMEM);
+
+ ret = drm_gem_object_init(dev, &xen_obj->base, size);
+ if (ret < 0) {
+ kfree(xen_obj);
+ return ERR_PTR(ret);
+ }
+
+ return xen_obj;
+}
+
+static struct xen_gem_object *gem_create(struct drm_device *dev, size_t size)
+{
+ struct xen_drm_front_drm_info *drm_info = dev->dev_private;
+ struct xen_gem_object *xen_obj;
+ int ret;
+
+ size = round_up(size, PAGE_SIZE);
+ xen_obj = gem_create_obj(dev, size);
+ if (IS_ERR_OR_NULL(xen_obj))
+ return xen_obj;
+
+ if (drm_info->cfg->be_alloc) {
+ /*
+ * backend will allocate space for this buffer, so
+ * only allocate array of pointers to pages
+ */
+ xen_obj->be_alloc = true;
+ ret = gem_alloc_pages_array(xen_obj, size);
+ if (ret < 0) {
+ gem_free_pages_array(xen_obj);
+ goto fail;
+ }
+
+ ret = alloc_xenballooned_pages(xen_obj->num_pages,
+ xen_obj->pages);
+ if (ret < 0) {
+ DRM_ERROR("Cannot allocate %zu ballooned pages: %d\n",
+ xen_obj->num_pages, ret);
+ goto fail;
+ }
+
+ return xen_obj;
+ }
+ /*
+ * need to allocate backing pages now, so we can share those
+ * with the backend
+ */
+ xen_obj->num_pages = DIV_ROUND_UP(size, PAGE_SIZE);
+ xen_obj->pages = drm_gem_get_pages(&xen_obj->base);
+ if (IS_ERR_OR_NULL(xen_obj->pages)) {
+ ret = PTR_ERR(xen_obj->pages);
+ xen_obj->pages = NULL;
+ goto fail;
+ }
+
+ return xen_obj;
+
+fail:
+ DRM_ERROR("Failed to allocate buffer with size %zu\n", size);
+ return ERR_PTR(ret);
+}
+
+static struct xen_gem_object *gem_create_with_handle(struct drm_file *filp,
+ struct drm_device *dev, size_t size, uint32_t *handle)
+{
+ struct xen_gem_object *xen_obj;
+ struct drm_gem_object *gem_obj;
+ int ret;
+
+ xen_obj = gem_create(dev, size);
+ if (IS_ERR_OR_NULL(xen_obj))
+ return xen_obj;
+
+ gem_obj = &xen_obj->base;
+ ret = drm_gem_handle_create(filp, gem_obj, handle);
+ /* handle holds the reference */
+ drm_gem_object_unreference_unlocked(gem_obj);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ return xen_obj;
+}
+
+static int gem_dumb_create(struct drm_file *filp, struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct xen_gem_object *xen_obj;
+
+ args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
+ args->size = args->pitch * args->height;
+
+ xen_obj = gem_create_with_handle(filp, dev, args->size, &args->handle);
+ if (IS_ERR_OR_NULL(xen_obj))
+ return xen_obj == NULL ? -ENOMEM : PTR_ERR(xen_obj);
+
+ return 0;
+}
+
+static void gem_free_object(struct drm_gem_object *gem_obj)
+{
+ struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj);
+
+ if (xen_obj->base.import_attach) {
+ drm_prime_gem_destroy(&xen_obj->base, xen_obj->sgt_imported);
+ gem_free_pages_array(xen_obj);
+ } else {
+ if (xen_obj->pages) {
+ if (xen_obj->be_alloc) {
+ free_xenballooned_pages(xen_obj->num_pages,
+ xen_obj->pages);
+ gem_free_pages_array(xen_obj);
+ } else
+ drm_gem_put_pages(&xen_obj->base,
+ xen_obj->pages, true, false);
+ }
+ }
+ drm_gem_object_release(gem_obj);
+ kfree(xen_obj);
+}
+
+static struct page **gem_get_pages(struct drm_gem_object *gem_obj)
+{
+ struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj);
+
+ return xen_obj->pages;
+}
+
+static struct sg_table *gem_get_sg_table(struct drm_gem_object *gem_obj)
+{
+ struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj);
+
+ if (!xen_obj->pages)
+ return NULL;
+
+ return drm_prime_pages_to_sg(xen_obj->pages, xen_obj->num_pages);
+}
+
+static struct drm_gem_object *gem_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach, struct sg_table *sgt)
+{
+ struct xen_drm_front_drm_info *drm_info = dev->dev_private;
+ struct xen_gem_object *xen_obj;
+ size_t size;
+ int ret;
+
+ size = attach->dmabuf->size;
+ xen_obj = gem_create_obj(dev, size);
+ if (IS_ERR_OR_NULL(xen_obj))
+ return ERR_CAST(xen_obj);
+
+ ret = gem_alloc_pages_array(xen_obj, size);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ xen_obj->sgt_imported = sgt;
+
+ ret = drm_prime_sg_to_page_addr_arrays(sgt, xen_obj->pages,
+ NULL, xen_obj->num_pages);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ /*
+ * N.B. Although we have an API to create display buffer from sgt
+ * we use pages API, because we still need those for GEM handling,
+ * e.g. for mapping etc.
+ */
+ ret = drm_info->front_ops->dbuf_create_from_pages(
+ drm_info->front_info,
+ xen_drm_front_dbuf_to_cookie(&xen_obj->base),
+ 0, 0, 0, size, xen_obj->pages);
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ DRM_DEBUG("Imported buffer of size %zu with nents %u\n",
+ size, sgt->nents);
+
+ return &xen_obj->base;
+}
+
+static int gem_mmap_obj(struct xen_gem_object *xen_obj,
+ struct vm_area_struct *vma)
+{
+ unsigned long addr = vma->vm_start;
+ int i;
+
+ /*
+ * clear the VM_PFNMAP flag that was set by drm_gem_mmap(), and set the
+ * vm_pgoff (used as a fake buffer offset by DRM) to 0 as we want to map
+ * the whole buffer.
+ */
+ vma->vm_flags &= ~VM_PFNMAP;
+ vma->vm_flags |= VM_MIXEDMAP;
+ vma->vm_pgoff = 0;
+ vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+
+ /*
+ * vm_operations_struct.fault handler will be called if CPU access
+ * to VM is here. For GPUs this isn't the case, because CPU
+ * doesn't touch the memory. Insert pages now, so both CPU and GPU are
+ * happy.
+ * FIXME: as we insert all the pages now then no .fault handler must
+ * be called, so don't provide one
+ */
+ for (i = 0; i < xen_obj->num_pages; i++) {
+ int ret;
+
+ ret = vm_insert_page(vma, addr, xen_obj->pages[i]);
+ if (ret < 0) {
+ DRM_ERROR("Failed to insert pages into vma: %d\n", ret);
+ return ret;
+ }
+
+ addr += PAGE_SIZE;
+ }
+ return 0;
+}
+
+static int gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ struct xen_gem_object *xen_obj;
+ struct drm_gem_object *gem_obj;
+ int ret;
+
+ ret = drm_gem_mmap(filp, vma);
+ if (ret < 0)
+ return ret;
+
+ gem_obj = vma->vm_private_data;
+ xen_obj = to_xen_gem_obj(gem_obj);
+ return gem_mmap_obj(xen_obj, vma);
+}
+
+static void *gem_prime_vmap(struct drm_gem_object *gem_obj)
+{
+ struct xen_gem_object *xen_obj = to_xen_gem_obj(gem_obj);
+
+ if (!xen_obj->pages)
+ return NULL;
+
+ return vmap(xen_obj->pages, xen_obj->num_pages,
+ VM_MAP, pgprot_writecombine(PAGE_KERNEL));
+}
+
+static void gem_prime_vunmap(struct drm_gem_object *gem_obj, void *vaddr)
+{
+ vunmap(vaddr);
+}
+
+static int gem_prime_mmap(struct drm_gem_object *gem_obj,
+ struct vm_area_struct *vma)
+{
+ struct xen_gem_object *xen_obj;
+ int ret;
+
+ ret = drm_gem_mmap_obj(gem_obj, gem_obj->size, vma);
+ if (ret < 0)
+ return ret;
+
+ xen_obj = to_xen_gem_obj(gem_obj);
+ return gem_mmap_obj(xen_obj, vma);
+}
+
+static const struct xen_drm_front_gem_ops xen_drm_gem_ops = {
+ .free_object_unlocked = gem_free_object,
+ .prime_get_sg_table = gem_get_sg_table,
+ .prime_import_sg_table = gem_import_sg_table,
+
+ .prime_vmap = gem_prime_vmap,
+ .prime_vunmap = gem_prime_vunmap,
+ .prime_mmap = gem_prime_mmap,
+
+ .dumb_create = gem_dumb_create,
+
+ .mmap = gem_mmap,
+
+ .get_pages = gem_get_pages,
+};
+
+const struct xen_drm_front_gem_ops *xen_drm_front_gem_get_ops(void)
+{
+ return &xen_drm_gem_ops;
+}
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem.h b/drivers/gpu/drm/xen/xen_drm_front_gem.h
new file mode 100644
index 000000000000..d1e1711cc3fc
--- /dev/null
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem.h
@@ -0,0 +1,46 @@
+/*
+ * Xen para-virtual DRM device
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2016-2018 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
+ */
+
+#ifndef __XEN_DRM_FRONT_GEM_H
+#define __XEN_DRM_FRONT_GEM_H
+
+#include <drm/drmP.h>
+
+struct xen_drm_front_gem_ops {
+ void (*free_object_unlocked)(struct drm_gem_object *obj);
+
+ struct sg_table *(*prime_get_sg_table)(struct drm_gem_object *obj);
+ struct drm_gem_object *(*prime_import_sg_table)(struct drm_device *dev,
+ struct dma_buf_attachment *attach,
+ struct sg_table *sgt);
+ void *(*prime_vmap)(struct drm_gem_object *obj);
+ void (*prime_vunmap)(struct drm_gem_object *obj, void *vaddr);
+ int (*prime_mmap)(struct drm_gem_object *obj,
+ struct vm_area_struct *vma);
+
+ int (*dumb_create)(struct drm_file *file_priv, struct drm_device *dev,
+ struct drm_mode_create_dumb *args);
+
+ int (*mmap)(struct file *filp, struct vm_area_struct *vma);
+
+ struct page **(*get_pages)(struct drm_gem_object *obj);
+};
+
+const struct xen_drm_front_gem_ops *xen_drm_front_gem_get_ops(void);
+
+#endif /* __XEN_DRM_FRONT_GEM_H */
diff --git a/drivers/gpu/drm/xen/xen_drm_front_gem_cma.c b/drivers/gpu/drm/xen/xen_drm_front_gem_cma.c
new file mode 100644
index 000000000000..5ffcbfa652d5
--- /dev/null
+++ b/drivers/gpu/drm/xen/xen_drm_front_gem_cma.c
@@ -0,0 +1,93 @@
+/*
+ * Xen para-virtual DRM device
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2016-2018 EPAM Systems Inc.
+ *
+ * Author: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_gem.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+
+#include "xen_drm_front.h"
+#include "xen_drm_front_drv.h"
+#include "xen_drm_front_gem.h"
+
+static struct drm_gem_object *gem_import_sg_table(struct drm_device *dev,
+ struct dma_buf_attachment *attach, struct sg_table *sgt)
+{
+ struct xen_drm_front_drm_info *drm_info = dev->dev_private;
+ struct drm_gem_object *gem_obj;
+ struct drm_gem_cma_object *cma_obj;
+ int ret;
+
+ gem_obj = drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
+ if (IS_ERR_OR_NULL(gem_obj))
+ return gem_obj;
+
+ cma_obj = to_drm_gem_cma_obj(gem_obj);
+
+ ret = drm_info->front_ops->dbuf_create_from_sgt(
+ drm_info->front_info,
+ xen_drm_front_dbuf_to_cookie(gem_obj),
+ 0, 0, 0, gem_obj->size,
+ drm_gem_cma_prime_get_sg_table(gem_obj));
+ if (ret < 0)
+ return ERR_PTR(ret);
+
+ DRM_DEBUG("Imported CMA buffer of size %zu\n", gem_obj->size);
+
+ return gem_obj;
+}
+
+static int gem_dumb_create(struct drm_file *filp, struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct xen_drm_front_drm_info *drm_info = dev->dev_private;
+
+ if (drm_info->cfg->be_alloc) {
+ /* This use-case is not yet supported and probably won't be */
+ DRM_ERROR("Backend allocated buffers and CMA helpers are not supported at the same time\n");
+ return -EINVAL;
+ }
+
+ return drm_gem_cma_dumb_create(filp, dev, args);
+}
+
+static struct page **gem_get_pages(struct drm_gem_object *gem_obj)
+{
+ return NULL;
+}
+
+static const struct xen_drm_front_gem_ops xen_drm_front_gem_cma_ops = {
+ .free_object_unlocked = drm_gem_cma_free_object,
+ .prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
+ .prime_import_sg_table = gem_import_sg_table,
+
+ .prime_vmap = drm_gem_cma_prime_vmap,
+ .prime_vunmap = drm_gem_cma_prime_vunmap,
+ .prime_mmap = drm_gem_cma_prime_mmap,
+
+ .dumb_create = gem_dumb_create,
+
+ .mmap = drm_gem_cma_mmap,
+
+ .get_pages = gem_get_pages,
+};
