drm/vgem: implement virtual GEM
This patch implements the virtual GEM driver with PRIME sharing which allows vgem to import a gem object from other drivers for the purpose of mmap-ing them to userspace. The mmap is done using the mmap operation exported by other drivers. v2: remove platform_device and do not attach to dma bufs v3: use drm helpers for get/put pages v4: correct dumb create pitch Reviewed-by: Rob Clark <robdclark@gmail.com> (v3) Reviewed-by: Stéphane Marchesin <marcheu@chromium.org> (v3) Signed-off-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Zach Reizner <zachr@google.com> Signed-off-by: Dave Airlie <airlied@redhat.com>hifive-unleashed-5.1
Zach Reizner
Dave Airlie
parent
564b687b03
commit
502e95c667
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@ -165,6 +165,15 @@ config DRM_SAVAGE
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Choose this option if you have a Savage3D/4/SuperSavage/Pro/Twister
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chipset. If M is selected the module will be called savage.
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config DRM_VGEM
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tristate "Virtual GEM provider"
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depends on DRM
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help
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Choose this option to get a virtual graphics memory manager,
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as used by Mesa's software renderer for enhanced performance.
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If M is selected the module will be called vgem.
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source "drivers/gpu/drm/exynos/Kconfig"
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source "drivers/gpu/drm/rockchip/Kconfig"
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@ -48,6 +48,7 @@ obj-$(CONFIG_DRM_SIS) += sis/
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obj-$(CONFIG_DRM_SAVAGE)+= savage/
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obj-$(CONFIG_DRM_VMWGFX)+= vmwgfx/
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obj-$(CONFIG_DRM_VIA) +=via/
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obj-$(CONFIG_DRM_VGEM) += vgem/
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obj-$(CONFIG_DRM_NOUVEAU) +=nouveau/
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obj-$(CONFIG_DRM_EXYNOS) +=exynos/
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obj-$(CONFIG_DRM_ROCKCHIP) +=rockchip/
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@ -0,0 +1,4 @@
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ccflags-y := -Iinclude/drm
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vgem-y := vgem_drv.o vgem_dma_buf.o
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obj-$(CONFIG_DRM_VGEM) += vgem.o
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@ -0,0 +1,94 @@
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/*
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* Copyright © 2012 Intel Corporation
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* Copyright © 2014 The Chromium OS Authors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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* Authors:
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* Ben Widawsky <ben@bwidawsk.net>
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*
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*/
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#include <linux/dma-buf.h>
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#include "vgem_drv.h"
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struct sg_table *vgem_gem_prime_get_sg_table(struct drm_gem_object *gobj)
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{
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struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
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BUG_ON(obj->pages == NULL);
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return drm_prime_pages_to_sg(obj->pages, obj->base.size / PAGE_SIZE);
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}
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int vgem_gem_prime_pin(struct drm_gem_object *gobj)
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{
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struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
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return vgem_gem_get_pages(obj);
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}
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void vgem_gem_prime_unpin(struct drm_gem_object *gobj)
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{
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struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
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vgem_gem_put_pages(obj);
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}
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void *vgem_gem_prime_vmap(struct drm_gem_object *gobj)
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{
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struct drm_vgem_gem_object *obj = to_vgem_bo(gobj);
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BUG_ON(obj->pages == NULL);
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return vmap(obj->pages, obj->base.size / PAGE_SIZE, 0, PAGE_KERNEL);
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}
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void vgem_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
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{
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vunmap(vaddr);
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}
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struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
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struct dma_buf *dma_buf)
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{
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struct drm_vgem_gem_object *obj = NULL;
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int ret;
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (obj == NULL) {
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ret = -ENOMEM;
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goto fail;
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}
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ret = drm_gem_object_init(dev, &obj->base, dma_buf->size);
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if (ret) {
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ret = -ENOMEM;
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goto fail_free;
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}
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get_dma_buf(dma_buf);
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obj->base.dma_buf = dma_buf;
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obj->use_dma_buf = true;
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return &obj->base;
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fail_free:
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kfree(obj);
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fail:
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return ERR_PTR(ret);
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}
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@ -0,0 +1,364 @@
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/*
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* Copyright 2011 Red Hat, Inc.
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* Copyright © 2014 The Chromium OS Authors
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software")
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* to deal in the software without restriction, including without limitation
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* on the rights to use, copy, modify, merge, publish, distribute, sub
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* license, and/or sell copies of the Software, and to permit persons to whom
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* them Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTIBILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES, OR OTHER LIABILITY, WHETHER
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* IN AN ACTION OF CONTRACT, TORT, OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors:
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* Adam Jackson <ajax@redhat.com>
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* Ben Widawsky <ben@bwidawsk.net>
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*/
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/**
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* This is vgem, a (non-hardware-backed) GEM service. This is used by Mesa's
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* software renderer and the X server for efficient buffer sharing.
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*/
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#include <linux/module.h>
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#include <linux/ramfs.h>
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#include <linux/shmem_fs.h>
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#include <linux/dma-buf.h>
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#include "vgem_drv.h"
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#define DRIVER_NAME "vgem"
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#define DRIVER_DESC "Virtual GEM provider"
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#define DRIVER_DATE "20120112"
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#define DRIVER_MAJOR 1
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#define DRIVER_MINOR 0
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void vgem_gem_put_pages(struct drm_vgem_gem_object *obj)
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{
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drm_gem_put_pages(&obj->base, obj->pages, false, false);
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obj->pages = NULL;
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}
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static void vgem_gem_free_object(struct drm_gem_object *obj)
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{
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struct drm_vgem_gem_object *vgem_obj = to_vgem_bo(obj);
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drm_gem_free_mmap_offset(obj);
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if (vgem_obj->use_dma_buf && obj->dma_buf) {
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dma_buf_put(obj->dma_buf);
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obj->dma_buf = NULL;
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}
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drm_gem_object_release(obj);
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if (vgem_obj->pages)
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vgem_gem_put_pages(vgem_obj);
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vgem_obj->pages = NULL;
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kfree(vgem_obj);
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}
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int vgem_gem_get_pages(struct drm_vgem_gem_object *obj)
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{
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struct page **pages;
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if (obj->pages || obj->use_dma_buf)
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return 0;
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pages = drm_gem_get_pages(&obj->base);
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if (IS_ERR(pages)) {
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return PTR_ERR(pages);
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}
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obj->pages = pages;
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return 0;
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}
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static int vgem_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct drm_vgem_gem_object *obj = vma->vm_private_data;
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struct drm_device *dev = obj->base.dev;
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loff_t num_pages;
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pgoff_t page_offset;
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int ret;
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/* We don't use vmf->pgoff since that has the fake offset */
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page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
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PAGE_SHIFT;
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num_pages = DIV_ROUND_UP(obj->base.size, PAGE_SIZE);
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if (page_offset > num_pages)
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return VM_FAULT_SIGBUS;
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mutex_lock(&dev->struct_mutex);
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ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address,
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obj->pages[page_offset]);
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mutex_unlock(&dev->struct_mutex);
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switch (ret) {
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case 0:
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return VM_FAULT_NOPAGE;
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case -ENOMEM:
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return VM_FAULT_OOM;
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case -EBUSY:
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return VM_FAULT_RETRY;
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case -EFAULT:
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case -EINVAL:
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return VM_FAULT_SIGBUS;
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default:
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WARN_ON(1);
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return VM_FAULT_SIGBUS;
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}
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}
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static struct vm_operations_struct vgem_gem_vm_ops = {
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.fault = vgem_gem_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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/* ioctls */
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static struct drm_gem_object *vgem_gem_create(struct drm_device *dev,
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struct drm_file *file,
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unsigned int *handle,
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unsigned long size)
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{
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struct drm_vgem_gem_object *obj;
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struct drm_gem_object *gem_object;
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int err;
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size = roundup(size, PAGE_SIZE);
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj)
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return ERR_PTR(-ENOMEM);
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gem_object = &obj->base;
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err = drm_gem_object_init(dev, gem_object, size);
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if (err)
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goto out;
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err = drm_gem_handle_create(file, gem_object, handle);
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if (err)
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goto handle_out;
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drm_gem_object_unreference_unlocked(gem_object);
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return gem_object;
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handle_out:
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drm_gem_object_release(gem_object);
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out:
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kfree(obj);
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return ERR_PTR(err);
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}
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static int vgem_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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struct drm_gem_object *gem_object;
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uint64_t size;
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uint64_t pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
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size = args->height * pitch;
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if (size == 0)
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return -EINVAL;
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gem_object = vgem_gem_create(dev, file, &args->handle, size);
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if (IS_ERR(gem_object)) {
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DRM_DEBUG_DRIVER("object creation failed\n");
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return PTR_ERR(gem_object);
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}
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args->size = gem_object->size;
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args->pitch = pitch;
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DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
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return 0;
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}
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int vgem_gem_dumb_map(struct drm_file *file, struct drm_device *dev,
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uint32_t handle, uint64_t *offset)
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{
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int ret = 0;
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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, handle);
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if (!obj) {
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ret = -ENOENT;
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goto unlock;
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}
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if (!drm_vma_node_has_offset(&obj->vma_node)) {
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ret = drm_gem_create_mmap_offset(obj);
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if (ret)
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goto unref;
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}
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BUG_ON(!obj->filp);
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obj->filp->private_data = obj;
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ret = vgem_gem_get_pages(to_vgem_bo(obj));
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if (ret)
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goto fail_get_pages;
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*offset = drm_vma_node_offset_addr(&obj->vma_node);
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goto unref;
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fail_get_pages:
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drm_gem_free_mmap_offset(obj);
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unref:
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drm_gem_object_unreference(obj);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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int vgem_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct drm_file *priv = filp->private_data;
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struct drm_device *dev = priv->minor->dev;
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struct drm_vma_offset_node *node;
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struct drm_gem_object *obj;
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struct drm_vgem_gem_object *vgem_obj;
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int ret = 0;
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mutex_lock(&dev->struct_mutex);
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node = drm_vma_offset_exact_lookup(dev->vma_offset_manager,
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vma->vm_pgoff,
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vma_pages(vma));
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if (!node) {
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ret = -EINVAL;
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goto out_unlock;
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} else if (!drm_vma_node_is_allowed(node, filp)) {
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ret = -EACCES;
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goto out_unlock;
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}
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obj = container_of(node, struct drm_gem_object, vma_node);
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vgem_obj = to_vgem_bo(obj);
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if (obj->dma_buf && vgem_obj->use_dma_buf) {
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ret = dma_buf_mmap(obj->dma_buf, vma, 0);
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goto out_unlock;
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}
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if (!obj->dev->driver->gem_vm_ops) {
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ret = -EINVAL;
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goto out_unlock;
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}
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vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP;
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vma->vm_ops = obj->dev->driver->gem_vm_ops;
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vma->vm_private_data = vgem_obj;
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vma->vm_page_prot =
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pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
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mutex_unlock(&dev->struct_mutex);
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drm_gem_vm_open(vma);
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return ret;
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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|
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static struct drm_ioctl_desc vgem_ioctls[] = {
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};
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static const struct file_operations vgem_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.mmap = vgem_drm_gem_mmap,
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.poll = drm_poll,
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.read = drm_read,
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.unlocked_ioctl = drm_ioctl,
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.release = drm_release,
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};
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static struct drm_driver vgem_driver = {
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.driver_features = DRIVER_GEM | DRIVER_PRIME,
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.gem_free_object = vgem_gem_free_object,
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.gem_vm_ops = &vgem_gem_vm_ops,
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.ioctls = vgem_ioctls,
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.fops = &vgem_driver_fops,
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.dumb_create = vgem_gem_dumb_create,
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.dumb_map_offset = vgem_gem_dumb_map,
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
|
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.gem_prime_export = drm_gem_prime_export,
|
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.gem_prime_import = vgem_gem_prime_import,
|
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.gem_prime_pin = vgem_gem_prime_pin,
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.gem_prime_unpin = vgem_gem_prime_unpin,
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.gem_prime_get_sg_table = vgem_gem_prime_get_sg_table,
|
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.gem_prime_vmap = vgem_gem_prime_vmap,
|
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.gem_prime_vunmap = vgem_gem_prime_vunmap,
|
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.name = DRIVER_NAME,
|
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.desc = DRIVER_DESC,
|
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.date = DRIVER_DATE,
|
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.major = DRIVER_MAJOR,
|
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.minor = DRIVER_MINOR,
|
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};
|
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|
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struct drm_device *vgem_device;
|
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|
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static int __init vgem_init(void)
|
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{
|
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int ret;
|
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|
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vgem_device = drm_dev_alloc(&vgem_driver, NULL);
|
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if (!vgem_device) {
|
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ret = -ENOMEM;
|
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goto out;
|
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}
|
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|
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ret = drm_dev_register(vgem_device, 0);
|
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|
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if (ret)
|
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goto out_unref;
|
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|
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return 0;
|
||||
|
||||
out_unref:
|
||||
drm_dev_unref(vgem_device);
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void __exit vgem_exit(void)
|
||||
{
|
||||
drm_dev_unregister(vgem_device);
|
||||
drm_dev_unref(vgem_device);
|
||||
}
|
||||
|
||||
module_init(vgem_init);
|
||||
module_exit(vgem_exit);
|
||||
|
||||
MODULE_AUTHOR("Red Hat, Inc.");
|
||||
MODULE_DESCRIPTION(DRIVER_DESC);
|
||||
MODULE_LICENSE("GPL and additional rights");
|
||||
|
|
@ -0,0 +1,57 @@
|
|||
/*
|
||||
* Copyright © 2012 Intel Corporation
|
||||
* Copyright © 2014 The Chromium OS Authors
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person obtaining a
|
||||
* copy of this software and associated documentation files (the "Software"),
|
||||
* to deal in the Software without restriction, including without limitation
|
||||
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
|
||||
* and/or sell copies of the Software, and to permit persons to whom the
|
||||
* Software is furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice (including the next
|
||||
* paragraph) shall be included in all copies or substantial portions of the
|
||||
* Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
||||
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
||||
* IN THE SOFTWARE.
|
||||
*
|
||||
* Authors:
|
||||
* Ben Widawsky <ben@bwidawsk.net>
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _VGEM_DRV_H_
|
||||
#define _VGEM_DRV_H_
|
||||
|
||||
#include <drm/drmP.h>
|
||||
#include <drm/drm_gem.h>
|
||||
|
||||
#define to_vgem_bo(x) container_of(x, struct drm_vgem_gem_object, base)
|
||||
struct drm_vgem_gem_object {
|
||||
struct drm_gem_object base;
|
||||
struct page **pages;
|
||||
bool use_dma_buf;
|
||||
};
|
||||
|
||||
/* vgem_drv.c */
|
||||
extern void vgem_gem_put_pages(struct drm_vgem_gem_object *obj);
|
||||
extern int vgem_gem_get_pages(struct drm_vgem_gem_object *obj);
|
||||
|
||||
/* vgem_dma_buf.c */
|
||||
extern struct sg_table *vgem_gem_prime_get_sg_table(
|
||||
struct drm_gem_object *gobj);
|
||||
extern int vgem_gem_prime_pin(struct drm_gem_object *gobj);
|
||||
extern void vgem_gem_prime_unpin(struct drm_gem_object *gobj);
|
||||
extern void *vgem_gem_prime_vmap(struct drm_gem_object *gobj);
|
||||
extern void vgem_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
|
||||
extern struct drm_gem_object *vgem_gem_prime_import(struct drm_device *dev,
|
||||
struct dma_buf *dma_buf);
|
||||
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue