drm: Begin an API for in-kernel clients
This the beginning of an API for in-kernel clients. First out is a way to get a framebuffer backed by a dumb buffer. Only GEM drivers are supported. The original idea of using an exported dma-buf was dropped because it also creates an anonomous file descriptor which doesn't work when the buffer is created from a kernel thread. The easy way out is to use drm_driver.gem_prime_vmap to get the virtual address, which requires a GEM object. This excludes the vmwgfx driver which is the only non-GEM driver apart from the legacy ones. A solution for vmwgfx will have to be worked out later if it wants to support the client API which it probably will when we have a bootsplash client. Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Noralf Trønnes <noralf@tronnes.org> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180703160354.59955-2-noralf@tronnes.orghifive-unleashed-5.1
Noralf Trønnes
parent
5ba57babcb
commit
c76f0f7cb5
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@ -0,0 +1,12 @@
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=================
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Kernel clients
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=================
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.. kernel-doc:: drivers/gpu/drm/drm_client.c
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:doc: overview
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.. kernel-doc:: include/drm/drm_client.h
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:internal:
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.. kernel-doc:: drivers/gpu/drm/drm_client.c
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:export:
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@ -10,6 +10,7 @@ Linux GPU Driver Developer's Guide
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drm-kms
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drm-kms-helpers
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drm-uapi
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drm-client
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drivers
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vga-switcheroo
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vgaarbiter
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@ -18,7 +18,7 @@ drm-y := drm_auth.o drm_bufs.o drm_cache.o \
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drm_encoder.o drm_mode_object.o drm_property.o \
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drm_plane.o drm_color_mgmt.o drm_print.o \
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drm_dumb_buffers.o drm_mode_config.o drm_vblank.o \
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drm_syncobj.o drm_lease.o drm_writeback.o
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drm_syncobj.o drm_lease.o drm_writeback.o drm_client.o
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drm-$(CONFIG_DRM_LIB_RANDOM) += lib/drm_random.o
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drm-$(CONFIG_DRM_VM) += drm_vm.o
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@ -0,0 +1,387 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2018 Noralf Trønnes
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*/
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/seq_file.h>
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#include <linux/slab.h>
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#include <drm/drm_client.h>
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#include <drm/drm_debugfs.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_file.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_gem.h>
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#include <drm/drm_mode.h>
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#include <drm/drm_print.h>
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#include <drm/drmP.h>
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#include "drm_crtc_internal.h"
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#include "drm_internal.h"
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/**
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* DOC: overview
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*
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* This library provides support for clients running in the kernel like fbdev and bootsplash.
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* Currently it's only partially implemented, just enough to support fbdev.
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*
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* GEM drivers which provide a GEM based dumb buffer with a virtual address are supported.
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*/
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static int drm_client_open(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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struct drm_file *file;
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file = drm_file_alloc(dev->primary);
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if (IS_ERR(file))
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return PTR_ERR(file);
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mutex_lock(&dev->filelist_mutex);
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list_add(&file->lhead, &dev->filelist_internal);
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mutex_unlock(&dev->filelist_mutex);
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client->file = file;
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return 0;
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}
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static void drm_client_close(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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mutex_lock(&dev->filelist_mutex);
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list_del(&client->file->lhead);
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mutex_unlock(&dev->filelist_mutex);
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drm_file_free(client->file);
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}
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EXPORT_SYMBOL(drm_client_close);
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/**
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* drm_client_new - Create a DRM client
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* @dev: DRM device
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* @client: DRM client
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* @name: Client name
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* @funcs: DRM client functions (optional)
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*
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* The caller needs to hold a reference on @dev before calling this function.
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* The client is freed when the &drm_device is unregistered. See drm_client_release().
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*
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* Returns:
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* Zero on success or negative error code on failure.
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*/
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int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
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const char *name, const struct drm_client_funcs *funcs)
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{
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bool registered;
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET) ||
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!dev->driver->dumb_create || !dev->driver->gem_prime_vmap)
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return -ENOTSUPP;
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if (funcs && !try_module_get(funcs->owner))
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return -ENODEV;
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client->dev = dev;
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client->name = name;
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client->funcs = funcs;
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ret = drm_client_open(client);
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if (ret)
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goto err_put_module;
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mutex_lock(&dev->clientlist_mutex);
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registered = dev->registered;
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if (registered)
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list_add(&client->list, &dev->clientlist);
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mutex_unlock(&dev->clientlist_mutex);
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if (!registered) {
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ret = -ENODEV;
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goto err_close;
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}
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drm_dev_get(dev);
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return 0;
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err_close:
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drm_client_close(client);
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err_put_module:
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if (funcs)
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module_put(funcs->owner);
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return ret;
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}
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EXPORT_SYMBOL(drm_client_new);
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/**
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* drm_client_release - Release DRM client resources
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* @client: DRM client
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*
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* Releases resources by closing the &drm_file that was opened by drm_client_new().
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* It is called automatically if the &drm_client_funcs.unregister callback is _not_ set.
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*
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* This function should only be called from the unregister callback. An exception
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* is fbdev which cannot free the buffer if userspace has open file descriptors.
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*
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* Note:
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* Clients cannot initiate a release by themselves. This is done to keep the code simple.
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* The driver has to be unloaded before the client can be unloaded.
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*/
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void drm_client_release(struct drm_client_dev *client)
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{
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struct drm_device *dev = client->dev;
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DRM_DEV_DEBUG_KMS(dev->dev, "%s\n", client->name);
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drm_client_close(client);
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drm_dev_put(dev);
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if (client->funcs)
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module_put(client->funcs->owner);
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}
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EXPORT_SYMBOL(drm_client_release);
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void drm_client_dev_unregister(struct drm_device *dev)
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{
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struct drm_client_dev *client, *tmp;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry_safe(client, tmp, &dev->clientlist, list) {
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list_del(&client->list);
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if (client->funcs && client->funcs->unregister) {
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client->funcs->unregister(client);
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} else {
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drm_client_release(client);
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kfree(client);
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}
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}
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mutex_unlock(&dev->clientlist_mutex);
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}
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/**
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* drm_client_dev_hotplug - Send hotplug event to clients
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* @dev: DRM device
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*
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* This function calls the &drm_client_funcs.hotplug callback on the attached clients.
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*
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* drm_kms_helper_hotplug_event() calls this function, so drivers that use it
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* don't need to call this function themselves.
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*/
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void drm_client_dev_hotplug(struct drm_device *dev)
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{
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struct drm_client_dev *client;
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry(client, &dev->clientlist, list) {
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if (!client->funcs || !client->funcs->hotplug)
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continue;
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ret = client->funcs->hotplug(client);
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DRM_DEV_DEBUG_KMS(dev->dev, "%s: ret=%d\n", client->name, ret);
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}
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mutex_unlock(&dev->clientlist_mutex);
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}
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EXPORT_SYMBOL(drm_client_dev_hotplug);
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void drm_client_dev_restore(struct drm_device *dev)
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{
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struct drm_client_dev *client;
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int ret;
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if (!drm_core_check_feature(dev, DRIVER_MODESET))
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return;
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mutex_lock(&dev->clientlist_mutex);
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list_for_each_entry(client, &dev->clientlist, list) {
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if (!client->funcs || !client->funcs->restore)
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continue;
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ret = client->funcs->restore(client);
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DRM_DEV_DEBUG_KMS(dev->dev, "%s: ret=%d\n", client->name, ret);
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if (!ret) /* The first one to return zero gets the privilege to restore */
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break;
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}
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mutex_unlock(&dev->clientlist_mutex);
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}
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static void drm_client_buffer_delete(struct drm_client_buffer *buffer)
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{
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struct drm_device *dev = buffer->client->dev;
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if (buffer->vaddr && dev->driver->gem_prime_vunmap)
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dev->driver->gem_prime_vunmap(buffer->gem, buffer->vaddr);
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if (buffer->gem)
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drm_gem_object_put_unlocked(buffer->gem);
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drm_mode_destroy_dumb(dev, buffer->handle, buffer->client->file);
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kfree(buffer);
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}
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static struct drm_client_buffer *
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drm_client_buffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
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{
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struct drm_mode_create_dumb dumb_args = { };
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struct drm_device *dev = client->dev;
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struct drm_client_buffer *buffer;
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struct drm_gem_object *obj;
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void *vaddr;
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int ret;
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buffer = kzalloc(sizeof(*buffer), GFP_KERNEL);
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if (!buffer)
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return ERR_PTR(-ENOMEM);
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buffer->client = client;
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dumb_args.width = width;
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dumb_args.height = height;
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dumb_args.bpp = drm_format_plane_cpp(format, 0) * 8;
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ret = drm_mode_create_dumb(dev, &dumb_args, client->file);
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if (ret)
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goto err_free;
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buffer->handle = dumb_args.handle;
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buffer->pitch = dumb_args.pitch;
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obj = drm_gem_object_lookup(client->file, dumb_args.handle);
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if (!obj) {
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ret = -ENOENT;
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goto err_delete;
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}
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buffer->gem = obj;
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/*
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* FIXME: The dependency on GEM here isn't required, we could
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* convert the driver handle to a dma-buf instead and use the
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* backend-agnostic dma-buf vmap support instead. This would
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* require that the handle2fd prime ioctl is reworked to pull the
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* fd_install step out of the driver backend hooks, to make that
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* final step optional for internal users.
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*/
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vaddr = dev->driver->gem_prime_vmap(obj);
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if (!vaddr) {
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ret = -ENOMEM;
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goto err_delete;
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}
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buffer->vaddr = vaddr;
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return buffer;
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err_delete:
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drm_client_buffer_delete(buffer);
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err_free:
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kfree(buffer);
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return ERR_PTR(ret);
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}
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static void drm_client_buffer_rmfb(struct drm_client_buffer *buffer)
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{
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int ret;
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if (!buffer->fb)
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return;
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ret = drm_mode_rmfb(buffer->client->dev, buffer->fb->base.id, buffer->client->file);
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if (ret)
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DRM_DEV_ERROR(buffer->client->dev->dev,
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"Error removing FB:%u (%d)\n", buffer->fb->base.id, ret);
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buffer->fb = NULL;
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}
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static int drm_client_buffer_addfb(struct drm_client_buffer *buffer,
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u32 width, u32 height, u32 format)
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{
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struct drm_client_dev *client = buffer->client;
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struct drm_mode_fb_cmd fb_req = { };
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const struct drm_format_info *info;
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int ret;
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info = drm_format_info(format);
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fb_req.bpp = info->cpp[0] * 8;
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fb_req.depth = info->depth;
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fb_req.width = width;
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fb_req.height = height;
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fb_req.handle = buffer->handle;
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fb_req.pitch = buffer->pitch;
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ret = drm_mode_addfb(client->dev, &fb_req, client->file);
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if (ret)
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return ret;
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buffer->fb = drm_framebuffer_lookup(client->dev, buffer->client->file, fb_req.fb_id);
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if (WARN_ON(!buffer->fb))
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return -ENOENT;
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/* drop the reference we picked up in framebuffer lookup */
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drm_framebuffer_put(buffer->fb);
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strscpy(buffer->fb->comm, client->name, TASK_COMM_LEN);
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return 0;
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}
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/**
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* drm_client_framebuffer_create - Create a client framebuffer
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* @client: DRM client
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* @width: Framebuffer width
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* @height: Framebuffer height
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* @format: Buffer format
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*
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* This function creates a &drm_client_buffer which consists of a
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* &drm_framebuffer backed by a dumb buffer.
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* Call drm_client_framebuffer_delete() to free the buffer.
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*
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* Returns:
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* Pointer to a client buffer or an error pointer on failure.
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*/
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struct drm_client_buffer *
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drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format)
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{
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struct drm_client_buffer *buffer;
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int ret;
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buffer = drm_client_buffer_create(client, width, height, format);
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if (IS_ERR(buffer))
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return buffer;
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ret = drm_client_buffer_addfb(buffer, width, height, format);
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if (ret) {
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drm_client_buffer_delete(buffer);
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return ERR_PTR(ret);
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}
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return buffer;
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}
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EXPORT_SYMBOL(drm_client_framebuffer_create);
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/**
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* drm_client_framebuffer_delete - Delete a client framebuffer
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* @buffer: DRM client buffer (can be NULL)
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*/
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void drm_client_framebuffer_delete(struct drm_client_buffer *buffer)
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{
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if (!buffer)
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return;
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drm_client_buffer_rmfb(buffer);
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drm_client_buffer_delete(buffer);
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}
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EXPORT_SYMBOL(drm_client_framebuffer_delete);
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@ -34,6 +34,7 @@
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#include <linux/slab.h>
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#include <linux/srcu.h>
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#include <drm/drm_client.h>
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#include <drm/drm_drv.h>
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#include <drm/drmP.h>
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@ -505,6 +506,8 @@ int drm_dev_init(struct drm_device *dev,
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dev->driver = driver;
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INIT_LIST_HEAD(&dev->filelist);
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INIT_LIST_HEAD(&dev->filelist_internal);
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INIT_LIST_HEAD(&dev->clientlist);
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INIT_LIST_HEAD(&dev->ctxlist);
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INIT_LIST_HEAD(&dev->vmalist);
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INIT_LIST_HEAD(&dev->maplist);
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@ -514,6 +517,7 @@ int drm_dev_init(struct drm_device *dev,
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spin_lock_init(&dev->event_lock);
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mutex_init(&dev->struct_mutex);
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mutex_init(&dev->filelist_mutex);
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mutex_init(&dev->clientlist_mutex);
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mutex_init(&dev->ctxlist_mutex);
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mutex_init(&dev->master_mutex);
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@ -569,6 +573,7 @@ err_minors:
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err_free:
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mutex_destroy(&dev->master_mutex);
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mutex_destroy(&dev->ctxlist_mutex);
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mutex_destroy(&dev->clientlist_mutex);
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mutex_destroy(&dev->filelist_mutex);
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mutex_destroy(&dev->struct_mutex);
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return ret;
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@ -603,6 +608,7 @@ void drm_dev_fini(struct drm_device *dev)
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mutex_destroy(&dev->master_mutex);
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mutex_destroy(&dev->ctxlist_mutex);
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mutex_destroy(&dev->clientlist_mutex);
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mutex_destroy(&dev->filelist_mutex);
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mutex_destroy(&dev->struct_mutex);
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kfree(dev->unique);
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@ -858,6 +864,8 @@ void drm_dev_unregister(struct drm_device *dev)
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dev->registered = false;
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drm_client_dev_unregister(dev);
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if (drm_core_check_feature(dev, DRIVER_MODESET))
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drm_modeset_unregister_all(dev);
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|
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@ -35,6 +35,7 @@
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#include <linux/slab.h>
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#include <linux/module.h>
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|
||||
#include <drm/drm_client.h>
|
||||
#include <drm/drm_file.h>
|
||||
#include <drm/drmP.h>
|
||||
|
||||
|
|
@ -444,6 +445,8 @@ void drm_lastclose(struct drm_device * dev)
|
|||
|
||||
if (drm_core_check_feature(dev, DRIVER_LEGACY))
|
||||
drm_legacy_dev_reinit(dev);
|
||||
|
||||
drm_client_dev_restore(dev);
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
|
|
@ -33,6 +33,7 @@
|
|||
#include <linux/moduleparam.h>
|
||||
|
||||
#include <drm/drmP.h>
|
||||
#include <drm/drm_client.h>
|
||||
#include <drm/drm_crtc.h>
|
||||
#include <drm/drm_fourcc.h>
|
||||
#include <drm/drm_crtc_helper.h>
|
||||
|
|
@ -559,6 +560,8 @@ void drm_kms_helper_hotplug_event(struct drm_device *dev)
|
|||
drm_sysfs_hotplug_event(dev);
|
||||
if (dev->mode_config.funcs->output_poll_changed)
|
||||
dev->mode_config.funcs->output_poll_changed(dev);
|
||||
|
||||
drm_client_dev_hotplug(dev);
|
||||
}
|
||||
EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
|
||||
|
||||
|
|
|
|||
|
|
@ -0,0 +1,136 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0 */
|
||||
|
||||
#ifndef _DRM_CLIENT_H_
|
||||
#define _DRM_CLIENT_H_
|
||||
|
||||
#include <linux/types.h>
|
||||
|
||||
struct drm_client_dev;
|
||||
struct drm_device;
|
||||
struct drm_file;
|
||||
struct drm_framebuffer;
|
||||
struct drm_gem_object;
|
||||
struct module;
|
||||
|
||||
/**
|
||||
* struct drm_client_funcs - DRM client callbacks
|
||||
*/
|
||||
struct drm_client_funcs {
|
||||
/**
|
||||
* @owner: The module owner
|
||||
*/
|
||||
struct module *owner;
|
||||
|
||||
/**
|
||||
* @unregister:
|
||||
*
|
||||
* Called when &drm_device is unregistered. The client should respond by
|
||||
* releasing it's resources using drm_client_release().
|
||||
*
|
||||
* This callback is optional.
|
||||
*/
|
||||
void (*unregister)(struct drm_client_dev *client);
|
||||
|
||||
/**
|
||||
* @restore:
|
||||
*
|
||||
* Called on drm_lastclose(). The first client instance in the list that
|
||||
* returns zero gets the privilege to restore and no more clients are
|
||||
* called. This callback is not called after @unregister has been called.
|
||||
*
|
||||
* This callback is optional.
|
||||
*/
|
||||
int (*restore)(struct drm_client_dev *client);
|
||||
|
||||
/**
|
||||
* @hotplug:
|
||||
*
|
||||
* Called on drm_kms_helper_hotplug_event().
|
||||
* This callback is not called after @unregister has been called.
|
||||
*
|
||||
* This callback is optional.
|
||||
*/
|
||||
int (*hotplug)(struct drm_client_dev *client);
|
||||
};
|
||||
|
||||
/**
|
||||
* struct drm_client_dev - DRM client instance
|
||||
*/
|
||||
struct drm_client_dev {
|
||||
/**
|
||||
* @dev: DRM device
|
||||
*/
|
||||
struct drm_device *dev;
|
||||
|
||||
/**
|
||||
* @name: Name of the client.
|
||||
*/
|
||||
const char *name;
|
||||
|
||||
/**
|
||||
* @list:
|
||||
*
|
||||
* List of all clients of a DRM device, linked into
|
||||
* &drm_device.clientlist. Protected by &drm_device.clientlist_mutex.
|
||||
*/
|
||||
struct list_head list;
|
||||
|
||||
/**
|
||||
* @funcs: DRM client functions (optional)
|
||||
*/
|
||||
const struct drm_client_funcs *funcs;
|
||||
|
||||
/**
|
||||
* @file: DRM file
|
||||
*/
|
||||
struct drm_file *file;
|
||||
};
|
||||
|
||||
int drm_client_new(struct drm_device *dev, struct drm_client_dev *client,
|
||||
const char *name, const struct drm_client_funcs *funcs);
|
||||
void drm_client_release(struct drm_client_dev *client);
|
||||
|
||||
void drm_client_dev_unregister(struct drm_device *dev);
|
||||
void drm_client_dev_hotplug(struct drm_device *dev);
|
||||
void drm_client_dev_restore(struct drm_device *dev);
|
||||
|
||||
/**
|
||||
* struct drm_client_buffer - DRM client buffer
|
||||
*/
|
||||
struct drm_client_buffer {
|
||||
/**
|
||||
* @client: DRM client
|
||||
*/
|
||||
struct drm_client_dev *client;
|
||||
|
||||
/**
|
||||
* @handle: Buffer handle
|
||||
*/
|
||||
u32 handle;
|
||||
|
||||
/**
|
||||
* @pitch: Buffer pitch
|
||||
*/
|
||||
u32 pitch;
|
||||
|
||||
/**
|
||||
* @gem: GEM object backing this buffer
|
||||
*/
|
||||
struct drm_gem_object *gem;
|
||||
|
||||
/**
|
||||
* @vaddr: Virtual address for the buffer
|
||||
*/
|
||||
void *vaddr;
|
||||
|
||||
/**
|
||||
* @fb: DRM framebuffer
|
||||
*/
|
||||
struct drm_framebuffer *fb;
|
||||
};
|
||||
|
||||
struct drm_client_buffer *
|
||||
drm_client_framebuffer_create(struct drm_client_dev *client, u32 width, u32 height, u32 format);
|
||||
void drm_client_framebuffer_delete(struct drm_client_buffer *buffer);
|
||||
|
||||
#endif
|
||||
|
|
@ -74,6 +74,27 @@ struct drm_device {
|
|||
struct mutex filelist_mutex;
|
||||
struct list_head filelist;
|
||||
|
||||
/**
|
||||
* @filelist_internal:
|
||||
*
|
||||
* List of open DRM files for in-kernel clients. Protected by @filelist_mutex.
|
||||
*/
|
||||
struct list_head filelist_internal;
|
||||
|
||||
/**
|
||||
* @clientlist_mutex:
|
||||
*
|
||||
* Protects @clientlist access.
|
||||
*/
|
||||
struct mutex clientlist_mutex;
|
||||
|
||||
/**
|
||||
* @clientlist:
|
||||
*
|
||||
* List of in-kernel clients. Protected by @clientlist_mutex.
|
||||
*/
|
||||
struct list_head clientlist;
|
||||
|
||||
/** \name Memory management */
|
||||
/*@{ */
|
||||
struct list_head maplist; /**< Linked list of regions */
|
||||
|
|
|
|||
Loading…
Reference in New Issue