[PATCH 6/9] drm/xen-front: Introduce DRM/KMS virtual display driver
Oleksandr Andrushchenko
andr2000 at gmail.com
Mon Mar 5 09:19:44 UTC 2018
On 03/05/2018 11:13 AM, Daniel Vetter wrote:
> On Wed, Feb 21, 2018 at 10:03:39AM +0200, Oleksandr Andrushchenko wrote:
>> From: Oleksandr Andrushchenko <oleksandr_andrushchenko at epam.com>
>>
>> Implement essential initialization of the display driver:
>> - introduce required data structures
>> - handle DRM/KMS driver registration
>> - perform basic DRM driver initialization
>> - register driver on backend connection
>> - remove driver on backend disconnect
>> - introduce essential callbacks required by DRM/KMS core
>> - introduce essential callbacks required for frontend operations
>>
>> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko at epam.com>
>> ---
>> drivers/gpu/drm/xen/Makefile | 1 +
>> drivers/gpu/drm/xen/xen_drm_front.c | 169 ++++++++++++++++++++++++-
>> drivers/gpu/drm/xen/xen_drm_front.h | 24 ++++
>> drivers/gpu/drm/xen/xen_drm_front_drv.c | 211 ++++++++++++++++++++++++++++++++
>> drivers/gpu/drm/xen/xen_drm_front_drv.h | 60 +++++++++
>> 5 files changed, 462 insertions(+), 3 deletions(-)
>> create mode 100644 drivers/gpu/drm/xen/xen_drm_front_drv.c
>> create mode 100644 drivers/gpu/drm/xen/xen_drm_front_drv.h
>>
>> diff --git a/drivers/gpu/drm/xen/Makefile b/drivers/gpu/drm/xen/Makefile
>> index f1823cb596c5..d3068202590f 100644
>> --- a/drivers/gpu/drm/xen/Makefile
>> +++ b/drivers/gpu/drm/xen/Makefile
>> @@ -1,6 +1,7 @@
>> # SPDX-License-Identifier: GPL-2.0
>>
>> drm_xen_front-objs := xen_drm_front.o \
>> + xen_drm_front_drv.o \
>> xen_drm_front_evtchnl.o \
>> xen_drm_front_shbuf.o \
>> xen_drm_front_cfg.o
>> diff --git a/drivers/gpu/drm/xen/xen_drm_front.c b/drivers/gpu/drm/xen/xen_drm_front.c
>> index 0d94ff272da3..8de88e359d5e 100644
>> --- a/drivers/gpu/drm/xen/xen_drm_front.c
>> +++ b/drivers/gpu/drm/xen/xen_drm_front.c
>> @@ -18,6 +18,8 @@
>>
>> #include <drm/drmP.h>
>>
>> +#include <linux/of_device.h>
>> +
>> #include <xen/platform_pci.h>
>> #include <xen/xen.h>
>> #include <xen/xenbus.h>
>> @@ -25,15 +27,161 @@
>> #include <xen/interface/io/displif.h>
>>
>> #include "xen_drm_front.h"
>> +#include "xen_drm_front_drv.h"
>> #include "xen_drm_front_evtchnl.h"
>> #include "xen_drm_front_shbuf.h"
>>
>> +static int be_mode_set(struct xen_drm_front_drm_pipeline *pipeline, uint32_t x,
>> + uint32_t y, uint32_t width, uint32_t height, uint32_t bpp,
>> + uint64_t fb_cookie)
>> +
>> +{
>> + return 0;
>> +}
>> +
>> +static int be_dbuf_create_int(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint32_t width, uint32_t height,
>> + uint32_t bpp, uint64_t size, struct page **pages,
>> + struct sg_table *sgt)
>> +{
>> + return 0;
>> +}
>> +
>> +static int be_dbuf_create_from_sgt(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint32_t width, uint32_t height,
>> + uint32_t bpp, uint64_t size, struct sg_table *sgt)
>> +{
>> + return be_dbuf_create_int(front_info, dbuf_cookie, width, height,
>> + bpp, size, NULL, sgt);
>> +}
>> +
>> +static int be_dbuf_create_from_pages(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint32_t width, uint32_t height,
>> + uint32_t bpp, uint64_t size, struct page **pages)
>> +{
>> + return be_dbuf_create_int(front_info, dbuf_cookie, width, height,
>> + bpp, size, pages, NULL);
>> +}
>> +
>> +static int be_dbuf_destroy(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie)
>> +{
>> + return 0;
>> +}
>> +
>> +static int be_fb_attach(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint64_t fb_cookie, uint32_t width,
>> + uint32_t height, uint32_t pixel_format)
>> +{
>> + return 0;
>> +}
>> +
>> +static int be_fb_detach(struct xen_drm_front_info *front_info,
>> + uint64_t fb_cookie)
>> +{
>> + return 0;
>> +}
>> +
>> +static int be_page_flip(struct xen_drm_front_info *front_info, int conn_idx,
>> + uint64_t fb_cookie)
>> +{
>> + return 0;
>> +}
>> +
>> +static void xen_drm_drv_unload(struct xen_drm_front_info *front_info)
>> +{
>> + if (front_info->xb_dev->state != XenbusStateReconfiguring)
>> + return;
>> +
>> + DRM_DEBUG("Can try removing driver now\n");
>> + xenbus_switch_state(front_info->xb_dev, XenbusStateInitialising);
>> +}
>> +
>> static struct xen_drm_front_ops front_ops = {
>> - /* placeholder for now */
>> + .mode_set = be_mode_set,
>> + .dbuf_create_from_pages = be_dbuf_create_from_pages,
>> + .dbuf_create_from_sgt = be_dbuf_create_from_sgt,
>> + .dbuf_destroy = be_dbuf_destroy,
>> + .fb_attach = be_fb_attach,
>> + .fb_detach = be_fb_detach,
>> + .page_flip = be_page_flip,
>> + .drm_last_close = xen_drm_drv_unload,
>> +};
> This looks like a midlayer/DRM-abstraction in your driver. Please remove,
> and instead directly hook your xen-front code into the relevant drm
> callbacks.
ok, will do
>
> In general also pls make sure you don't implement dummy callbacks that do
> nothing, we've tried really hard to make them all optional in the drm
> infrastructure.
sure
> -Daniel
>
>> +
>> +static int xen_drm_drv_probe(struct platform_device *pdev)
>> +{
>> + /*
>> + * The device is not spawn from a device tree, so arch_setup_dma_ops
>> + * is not called, thus leaving the device with dummy DMA ops.
>> + * This makes the device return error on PRIME buffer import, which
>> + * is not correct: to fix this call of_dma_configure() with a NULL
>> + * node to set default DMA ops.
>> + */
>> + of_dma_configure(&pdev->dev, NULL);
>> + return xen_drm_front_drv_probe(pdev, &front_ops);
>> +}
>> +
>> +static int xen_drm_drv_remove(struct platform_device *pdev)
>> +{
>> + return xen_drm_front_drv_remove(pdev);
>> +}
>> +
>> +struct platform_device_info xen_drm_front_platform_info = {
>> + .name = XENDISPL_DRIVER_NAME,
>> + .id = 0,
>> + .num_res = 0,
>> + .dma_mask = DMA_BIT_MASK(32),
>> };
>>
>> +static struct platform_driver xen_drm_front_front_info = {
>> + .probe = xen_drm_drv_probe,
>> + .remove = xen_drm_drv_remove,
>> + .driver = {
>> + .name = XENDISPL_DRIVER_NAME,
>> + },
>> +};
>> +
>> +static void xen_drm_drv_deinit(struct xen_drm_front_info *front_info)
>> +{
>> + if (!front_info->drm_pdrv_registered)
>> + return;
>> +
>> + if (front_info->drm_pdev)
>> + platform_device_unregister(front_info->drm_pdev);
>> +
>> + platform_driver_unregister(&xen_drm_front_front_info);
>> + front_info->drm_pdrv_registered = false;
>> + front_info->drm_pdev = NULL;
>> +}
>> +
>> +static int xen_drm_drv_init(struct xen_drm_front_info *front_info)
>> +{
>> + int ret;
>> +
>> + ret = platform_driver_register(&xen_drm_front_front_info);
>> + if (ret < 0)
>> + return ret;
>> +
>> + front_info->drm_pdrv_registered = true;
>> + /* pass card configuration via platform data */
>> + xen_drm_front_platform_info.data = &front_info->cfg;
>> + xen_drm_front_platform_info.size_data = sizeof(front_info->cfg);
>> +
>> + front_info->drm_pdev = platform_device_register_full(
>> + &xen_drm_front_platform_info);
>> + if (IS_ERR_OR_NULL(front_info->drm_pdev)) {
>> + DRM_ERROR("Failed to register " XENDISPL_DRIVER_NAME " PV DRM driver\n");
>> + front_info->drm_pdev = NULL;
>> + xen_drm_drv_deinit(front_info);
>> + return -ENODEV;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> static void xen_drv_remove_internal(struct xen_drm_front_info *front_info)
>> {
>> + xen_drm_drv_deinit(front_info);
>> xen_drm_front_evtchnl_free_all(front_info);
>> }
>>
>> @@ -59,13 +207,27 @@ static int backend_on_initwait(struct xen_drm_front_info *front_info)
>> static int backend_on_connected(struct xen_drm_front_info *front_info)
>> {
>> xen_drm_front_evtchnl_set_state(front_info, EVTCHNL_STATE_CONNECTED);
>> - return 0;
>> + return xen_drm_drv_init(front_info);
>> }
>>
>> static void backend_on_disconnected(struct xen_drm_front_info *front_info)
>> {
>> + bool removed = true;
>> +
>> + if (front_info->drm_pdev) {
>> + if (xen_drm_front_drv_is_used(front_info->drm_pdev)) {
>> + DRM_WARN("DRM driver still in use, deferring removal\n");
>> + removed = false;
>> + } else
>> + xen_drv_remove_internal(front_info);
>> + }
>> +
>> xen_drm_front_evtchnl_set_state(front_info, EVTCHNL_STATE_DISCONNECTED);
>> - xenbus_switch_state(front_info->xb_dev, XenbusStateInitialising);
>> +
>> + if (removed)
>> + xenbus_switch_state(front_info->xb_dev, XenbusStateInitialising);
>> + else
>> + xenbus_switch_state(front_info->xb_dev, XenbusStateReconfiguring);
>> }
>>
>> static void backend_on_changed(struct xenbus_device *xb_dev,
>> @@ -148,6 +310,7 @@ static int xen_drv_probe(struct xenbus_device *xb_dev,
>>
>> front_info->xb_dev = xb_dev;
>> spin_lock_init(&front_info->io_lock);
>> + front_info->drm_pdrv_registered = false;
>> dev_set_drvdata(&xb_dev->dev, front_info);
>> return xenbus_switch_state(xb_dev, XenbusStateInitialising);
>> }
>> diff --git a/drivers/gpu/drm/xen/xen_drm_front.h b/drivers/gpu/drm/xen/xen_drm_front.h
>> index 13f22736ae02..9ed5bfb248d0 100644
>> --- a/drivers/gpu/drm/xen/xen_drm_front.h
>> +++ b/drivers/gpu/drm/xen/xen_drm_front.h
>> @@ -19,6 +19,8 @@
>> #ifndef __XEN_DRM_FRONT_H_
>> #define __XEN_DRM_FRONT_H_
>>
>> +#include <linux/scatterlist.h>
>> +
>> #include "xen_drm_front_cfg.h"
>>
>> #ifndef GRANT_INVALID_REF
>> @@ -30,16 +32,38 @@
>> #define GRANT_INVALID_REF 0
>> #endif
>>
>> +struct xen_drm_front_drm_pipeline;
>> +
>> struct xen_drm_front_ops {
>> + int (*mode_set)(struct xen_drm_front_drm_pipeline *pipeline,
>> + uint32_t x, uint32_t y, uint32_t width, uint32_t height,
>> + uint32_t bpp, uint64_t fb_cookie);
>> + int (*dbuf_create_from_pages)(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint32_t width, uint32_t height,
>> + uint32_t bpp, uint64_t size, struct page **pages);
>> + int (*dbuf_create_from_sgt)(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint32_t width, uint32_t height,
>> + uint32_t bpp, uint64_t size, struct sg_table *sgt);
>> + int (*dbuf_destroy)(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie);
>> + int (*fb_attach)(struct xen_drm_front_info *front_info,
>> + uint64_t dbuf_cookie, uint64_t fb_cookie,
>> + uint32_t width, uint32_t height, uint32_t pixel_format);
>> + int (*fb_detach)(struct xen_drm_front_info *front_info,
>> + uint64_t fb_cookie);
>> + int (*page_flip)(struct xen_drm_front_info *front_info,
>> + int conn_idx, uint64_t fb_cookie);
>> /* CAUTION! this is called with a spin_lock held! */
>> void (*on_frame_done)(struct platform_device *pdev,
>> int conn_idx, uint64_t fb_cookie);
>> + void (*drm_last_close)(struct xen_drm_front_info *front_info);
>> };
>>
>> struct xen_drm_front_info {
>> struct xenbus_device *xb_dev;
>> /* to protect data between backend IO code and interrupt handler */
>> spinlock_t io_lock;
>> + bool drm_pdrv_registered;
>> /* virtual DRM platform device */
>> struct platform_device *drm_pdev;
>>
>> diff --git a/drivers/gpu/drm/xen/xen_drm_front_drv.c b/drivers/gpu/drm/xen/xen_drm_front_drv.c
>> new file mode 100644
>> index 000000000000..b3764d5ed0f6
>> --- /dev/null
>> +++ b/drivers/gpu/drm/xen/xen_drm_front_drv.c
>> @@ -0,0 +1,211 @@
>> +/*
>> + * 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 at epam.com>
>> + */
>> +
>> +#include <drm/drmP.h>
>> +#include <drm/drm_gem.h>
>> +#include <drm/drm_atomic_helper.h>
>> +
>> +#include "xen_drm_front.h"
>> +#include "xen_drm_front_cfg.h"
>> +#include "xen_drm_front_drv.h"
>> +
>> +static int dumb_create(struct drm_file *filp,
>> + struct drm_device *dev, struct drm_mode_create_dumb *args)
>> +{
>> + return -EINVAL;
>> +}
>> +
>> +static void free_object(struct drm_gem_object *obj)
>> +{
>> + struct xen_drm_front_drm_info *drm_info = obj->dev->dev_private;
>> +
>> + drm_info->front_ops->dbuf_destroy(drm_info->front_info,
>> + xen_drm_front_dbuf_to_cookie(obj));
>> +}
>> +
>> +static void on_frame_done(struct platform_device *pdev,
>> + int conn_idx, uint64_t fb_cookie)
>> +{
>> +}
>> +
>> +static void lastclose(struct drm_device *dev)
>> +{
>> + struct xen_drm_front_drm_info *drm_info = dev->dev_private;
>> +
>> + drm_info->front_ops->drm_last_close(drm_info->front_info);
>> +}
>> +
>> +static int gem_mmap(struct file *filp, struct vm_area_struct *vma)
>> +{
>> + return -EINVAL;
>> +}
>> +
>> +static struct sg_table *prime_get_sg_table(struct drm_gem_object *obj)
>> +{
>> + return NULL;
>> +}
>> +
>> +static struct drm_gem_object *prime_import_sg_table(struct drm_device *dev,
>> + struct dma_buf_attachment *attach, struct sg_table *sgt)
>> +{
>> + return NULL;
>> +}
>> +
>> +static void *prime_vmap(struct drm_gem_object *obj)
>> +{
>> + return NULL;
>> +}
>> +
>> +static void prime_vunmap(struct drm_gem_object *obj, void *vaddr)
>> +{
>> +}
>> +
>> +static int prime_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
>> +{
>> + return -EINVAL;
>> +}
>> +
>> +static const struct file_operations xendrm_fops = {
>> + .owner = THIS_MODULE,
>> + .open = drm_open,
>> + .release = drm_release,
>> + .unlocked_ioctl = drm_ioctl,
>> +#ifdef CONFIG_COMPAT
>> + .compat_ioctl = drm_compat_ioctl,
>> +#endif
>> + .poll = drm_poll,
>> + .read = drm_read,
>> + .llseek = no_llseek,
>> + .mmap = gem_mmap,
>> +};
>> +
>> +static const struct vm_operations_struct xen_drm_vm_ops = {
>> + .open = drm_gem_vm_open,
>> + .close = drm_gem_vm_close,
>> +};
>> +
>> +struct drm_driver xen_drm_driver = {
>> + .driver_features = DRIVER_GEM | DRIVER_MODESET |
>> + DRIVER_PRIME | DRIVER_ATOMIC,
>> + .lastclose = lastclose,
>> + .gem_free_object_unlocked = free_object,
>> + .gem_vm_ops = &xen_drm_vm_ops,
>> + .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
>> + .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
>> + .gem_prime_import = drm_gem_prime_import,
>> + .gem_prime_export = drm_gem_prime_export,
>> + .gem_prime_get_sg_table = prime_get_sg_table,
>> + .gem_prime_import_sg_table = prime_import_sg_table,
>> + .gem_prime_vmap = prime_vmap,
>> + .gem_prime_vunmap = prime_vunmap,
>> + .gem_prime_mmap = prime_mmap,
>> + .dumb_create = dumb_create,
>> + .fops = &xendrm_fops,
>> + .name = "xendrm-du",
>> + .desc = "Xen PV DRM Display Unit",
>> + .date = "20161109",
>> + .major = 1,
>> + .minor = 0,
>> +};
>> +
>> +int xen_drm_front_drv_probe(struct platform_device *pdev,
>> + struct xen_drm_front_ops *front_ops)
>> +{
>> + struct xen_drm_front_cfg *cfg = dev_get_platdata(&pdev->dev);
>> + struct xen_drm_front_drm_info *drm_info;
>> + struct drm_device *dev;
>> + int ret;
>> +
>> + DRM_INFO("Creating %s\n", xen_drm_driver.desc);
>> +
>> + drm_info = devm_kzalloc(&pdev->dev, sizeof(*drm_info), GFP_KERNEL);
>> + if (!drm_info)
>> + return -ENOMEM;
>> +
>> + drm_info->front_ops = front_ops;
>> + drm_info->front_ops->on_frame_done = on_frame_done;
>> + drm_info->front_info = cfg->front_info;
>> +
>> + dev = drm_dev_alloc(&xen_drm_driver, &pdev->dev);
>> + if (!dev)
>> + return -ENOMEM;
>> +
>> + drm_info->drm_dev = dev;
>> +
>> + drm_info->cfg = cfg;
>> + dev->dev_private = drm_info;
>> + platform_set_drvdata(pdev, drm_info);
>> +
>> + ret = drm_vblank_init(dev, cfg->num_connectors);
>> + if (ret) {
>> + DRM_ERROR("Failed to initialize vblank, ret %d\n", ret);
>> + return ret;
>> + }
>> +
>> + dev->irq_enabled = 1;
>> +
>> + ret = drm_dev_register(dev, 0);
>> + if (ret)
>> + goto fail_register;
>> +
>> + DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n",
>> + xen_drm_driver.name, xen_drm_driver.major,
>> + xen_drm_driver.minor, xen_drm_driver.patchlevel,
>> + xen_drm_driver.date, dev->primary->index);
>> +
>> + return 0;
>> +
>> +fail_register:
>> + drm_dev_unregister(dev);
>> + drm_mode_config_cleanup(dev);
>> + return ret;
>> +}
>> +
>> +int xen_drm_front_drv_remove(struct platform_device *pdev)
>> +{
>> + struct xen_drm_front_drm_info *drm_info = platform_get_drvdata(pdev);
>> + struct drm_device *dev = drm_info->drm_dev;
>> +
>> + if (dev) {
>> + drm_dev_unregister(dev);
>> + drm_atomic_helper_shutdown(dev);
>> + drm_mode_config_cleanup(dev);
>> + drm_dev_unref(dev);
>> + }
>> + return 0;
>> +}
>> +
>> +bool xen_drm_front_drv_is_used(struct platform_device *pdev)
>> +{
>> + struct xen_drm_front_drm_info *drm_info = platform_get_drvdata(pdev);
>> + struct drm_device *dev;
>> +
>> + if (!drm_info)
>> + return false;
>> +
>> + dev = drm_info->drm_dev;
>> + if (!dev)
>> + return false;
>> +
>> + /*
>> + * FIXME: the code below must be protected by drm_global_mutex,
>> + * but it is not accessible to us. Anyways there is a race condition,
>> + * but we will re-try.
>> + */
>> + return dev->open_count != 0;
>> +}
>> diff --git a/drivers/gpu/drm/xen/xen_drm_front_drv.h b/drivers/gpu/drm/xen/xen_drm_front_drv.h
>> new file mode 100644
>> index 000000000000..aaa476535c13
>> --- /dev/null
>> +++ b/drivers/gpu/drm/xen/xen_drm_front_drv.h
>> @@ -0,0 +1,60 @@
>> +/*
>> + * 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 at epam.com>
>> + */
>> +
>> +#ifndef __XEN_DRM_FRONT_DRV_H_
>> +#define __XEN_DRM_FRONT_DRV_H_
>> +
>> +#include <drm/drmP.h>
>> +
>> +#include "xen_drm_front.h"
>> +#include "xen_drm_front_cfg.h"
>> +
>> +struct xen_drm_front_drm_pipeline {
>> + struct xen_drm_front_drm_info *drm_info;
>> +
>> + int index;
>> +};
>> +
>> +struct xen_drm_front_drm_info {
>> + struct xen_drm_front_info *front_info;
>> + struct xen_drm_front_ops *front_ops;
>> + struct drm_device *drm_dev;
>> + struct xen_drm_front_cfg *cfg;
>> +};
>> +
>> +static inline uint64_t xen_drm_front_fb_to_cookie(
>> + struct drm_framebuffer *fb)
>> +{
>> + return (uint64_t)fb;
>> +}
>> +
>> +static inline uint64_t xen_drm_front_dbuf_to_cookie(
>> + struct drm_gem_object *gem_obj)
>> +{
>> + return (uint64_t)gem_obj;
>> +}
>> +
>> +int xen_drm_front_drv_probe(struct platform_device *pdev,
>> + struct xen_drm_front_ops *front_ops);
>> +
>> +int xen_drm_front_drv_remove(struct platform_device *pdev);
>> +
>> +bool xen_drm_front_drv_is_used(struct platform_device *pdev);
>> +
>> +#endif /* __XEN_DRM_FRONT_DRV_H_ */
>> +
>> --
>> 2.7.4
>>
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