/* $NetBSD: drm_module.c,v 1.15.4.1 2020/01/05 09:42:05 martin Exp $ */ /*- * Copyright (c) 2013 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Taylor R. Campbell. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: drm_module.c,v 1.15.4.1 2020/01/05 09:42:05 martin Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * XXX This is stupid. * * 1. Builtin modules are broken: they don't get initialized before * autoconf matches devices, but we need the initialization to be * run in order to match and attach drmkms drivers. * * 2. The following dependencies are _not_ correct: * - drmkms can't depend on agp because not all drmkms drivers run * on platforms guaranteed to have pci, let alone agp * - drmkms_pci can't depend on agp because not all _pci_ has agp * (e.g., tegra) * - radeon (e.g.) can't depend on agp because not all radeon * devices are on platforms guaranteed to have agp * * 3. We need to register the agp hooks before we try to attach a * device. * * 4. The only mechanism we have to force this is the * mumblefrotz_guarantee_initialized kludge. * * 5. We don't know if we even _can_ call * drmkms_agp_guarantee_initialized unless we know NAGP. * * 6. We don't know NAGP unless we include "agp.h". * * 7. We can't include "agp.h" if the platform has agp. * * 8. The way we determine whether we have agp is NAGP. * * 9. @!*#&^@&*@!&^#@ */ #if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__) #include "agp.h" #endif /* * XXX I2C stuff should be moved to a separate drmkms_i2c module. */ MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux"); struct mutex drm_global_mutex; struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT(); static int drm_init(void) { extern int linux_guarantee_initialized(void); int error; error = linux_guarantee_initialized(); if (error) return error; drm_agp_hooks_init(); #if NAGP > 0 extern int drmkms_agp_guarantee_initialized(void); error = drmkms_agp_guarantee_initialized(); if (error) { drm_agp_hooks_fini(); return error; } #endif if (ISSET(boothowto, AB_DEBUG)) drm_debug = ~(unsigned int)0; spin_lock_init(&drm_minor_lock); idr_init(&drm_minors_idr); linux_mutex_init(&drm_global_mutex); drm_connector_ida_init(); drm_global_init(); drm_panel_init_lock(); drm_bridge_init_lock(); drm_sysctl_init(&drm_def); drm_i2c_encoders_init(); return 0; } int drm_guarantee_initialized(void) { #ifdef _MODULE return 0; #else static ONCE_DECL(drm_init_once); return RUN_ONCE(&drm_init_once, &drm_init); #endif } static void drm_fini(void) { drm_i2c_encoders_fini(); drm_sysctl_fini(&drm_def); drm_bridge_fini_lock(); drm_panel_fini_lock(); drm_global_release(); drm_connector_ida_destroy(); linux_mutex_destroy(&drm_global_mutex); idr_destroy(&drm_minors_idr); spin_lock_destroy(&drm_minor_lock); drm_agp_hooks_fini(); } int drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file) { return -ENODEV; } static int drmkms_modcmd(modcmd_t cmd, void *arg __unused) { #ifdef _MODULE devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR; #endif int error; switch (cmd) { case MODULE_CMD_INIT: #ifdef _MODULE error = drm_init(); #else error = drm_guarantee_initialized(); #endif if (error) return error; #ifdef _MODULE error = devsw_attach("drm", NULL, &bmajor, &drm_cdevsw, &cmajor); if (error) { aprint_error("drmkms: unable to attach devsw: %d\n", error); return error; } #endif return 0; case MODULE_CMD_FINI: #ifdef _MODULE error = devsw_detach(NULL, &drm_cdevsw); if (error) return error; #endif drm_fini(); return 0; default: return ENOTTY; } }