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drm_module.c revision 1.19
      1  1.19  riastrad /*	$NetBSD: drm_module.c,v 1.19 2021/12/19 00:55:26 riastradh Exp $	*/
      2   1.2  riastrad 
      3   1.2  riastrad /*-
      4   1.2  riastrad  * Copyright (c) 2013 The NetBSD Foundation, Inc.
      5   1.2  riastrad  * All rights reserved.
      6   1.2  riastrad  *
      7   1.2  riastrad  * This code is derived from software contributed to The NetBSD Foundation
      8   1.2  riastrad  * by Taylor R. Campbell.
      9   1.2  riastrad  *
     10   1.2  riastrad  * Redistribution and use in source and binary forms, with or without
     11   1.2  riastrad  * modification, are permitted provided that the following conditions
     12   1.2  riastrad  * are met:
     13   1.2  riastrad  * 1. Redistributions of source code must retain the above copyright
     14   1.2  riastrad  *    notice, this list of conditions and the following disclaimer.
     15   1.2  riastrad  * 2. Redistributions in binary form must reproduce the above copyright
     16   1.2  riastrad  *    notice, this list of conditions and the following disclaimer in the
     17   1.2  riastrad  *    documentation and/or other materials provided with the distribution.
     18   1.2  riastrad  *
     19   1.2  riastrad  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20   1.2  riastrad  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21   1.2  riastrad  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22   1.2  riastrad  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23   1.2  riastrad  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24   1.2  riastrad  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25   1.2  riastrad  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26   1.2  riastrad  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27   1.2  riastrad  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28   1.2  riastrad  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29   1.2  riastrad  * POSSIBILITY OF SUCH DAMAGE.
     30   1.2  riastrad  */
     31   1.2  riastrad 
     32   1.2  riastrad #include <sys/cdefs.h>
     33  1.19  riastrad __KERNEL_RCSID(0, "$NetBSD: drm_module.c,v 1.19 2021/12/19 00:55:26 riastradh Exp $");
     34   1.2  riastrad 
     35   1.2  riastrad #include <sys/types.h>
     36  1.12  riastrad #include <sys/condvar.h>
     37   1.8  riastrad #include <sys/conf.h>
     38   1.2  riastrad #include <sys/device.h>
     39   1.2  riastrad #include <sys/module.h>
     40  1.12  riastrad #include <sys/mutex.h>
     41   1.6  riastrad #include <sys/once.h>
     42   1.4  riastrad #include <sys/reboot.h>
     43   1.2  riastrad #include <sys/systm.h>
     44   1.2  riastrad 
     45   1.6  riastrad #include <linux/mutex.h>
     46   1.6  riastrad 
     47   1.2  riastrad #include <drm/drmP.h>
     48  1.10  riastrad #include <drm/drm_encoder_slave.h>
     49   1.9  christos #include <drm/drm_sysctl.h>
     50  1.17  jmcneill #include <drm/drm_panel.h>
     51   1.2  riastrad 
     52  1.19  riastrad #include "../dist/drm/drm_crtc_internal.h"
     53  1.18  riastrad #include "../dist/drm/drm_internal.h"
     54  1.18  riastrad 
     55   1.2  riastrad /*
     56  1.15  riastrad  * XXX This is stupid.
     57  1.15  riastrad  *
     58  1.15  riastrad  * 1. Builtin modules are broken: they don't get initialized before
     59  1.15  riastrad  *    autoconf matches devices, but we need the initialization to be
     60  1.15  riastrad  *    run in order to match and attach drmkms drivers.
     61  1.15  riastrad  *
     62  1.15  riastrad  * 2. The following dependencies are _not_ correct:
     63  1.15  riastrad  *    - drmkms can't depend on agp because not all drmkms drivers run
     64  1.15  riastrad  *      on platforms guaranteed to have pci, let alone agp
     65  1.15  riastrad  *    - drmkms_pci can't depend on agp because not all _pci_ has agp
     66  1.15  riastrad  *      (e.g., tegra)
     67  1.15  riastrad  *    - radeon (e.g.) can't depend on agp because not all radeon
     68  1.15  riastrad  *      devices are on platforms guaranteed to have agp
     69  1.15  riastrad  *
     70  1.15  riastrad  * 3. We need to register the agp hooks before we try to attach a
     71  1.15  riastrad  *    device.
     72  1.15  riastrad  *
     73  1.15  riastrad  * 4. The only mechanism we have to force this is the
     74  1.15  riastrad  *    mumblefrotz_guarantee_initialized kludge.
     75  1.15  riastrad  *
     76  1.15  riastrad  * 5. We don't know if we even _can_ call
     77  1.15  riastrad  *    drmkms_agp_guarantee_initialized unless we know NAGP.
     78  1.15  riastrad  *
     79  1.15  riastrad  * 6. We don't know NAGP unless we include "agp.h".
     80  1.15  riastrad  *
     81  1.15  riastrad  * 7. We can't include "agp.h" if the platform has agp.
     82  1.15  riastrad  *
     83  1.15  riastrad  * 8. The way we determine whether we have agp is NAGP.
     84  1.15  riastrad  *
     85  1.15  riastrad  * 9. @!*#&^@&*@!&^#@
     86  1.15  riastrad  */
     87  1.15  riastrad #if defined(__powerpc__) || defined(__i386__) || defined(__x86_64__)
     88  1.15  riastrad #include "agp.h"
     89  1.15  riastrad #endif
     90  1.15  riastrad 
     91  1.15  riastrad /*
     92   1.2  riastrad  * XXX I2C stuff should be moved to a separate drmkms_i2c module.
     93   1.2  riastrad  */
     94  1.11  pgoyette MODULE(MODULE_CLASS_DRIVER, drmkms, "drmkms_linux");
     95   1.2  riastrad 
     96   1.6  riastrad struct mutex	drm_global_mutex;
     97   1.6  riastrad 
     98   1.9  christos struct drm_sysctl_def drm_def = DRM_SYSCTL_INIT();
     99   1.9  christos 
    100   1.6  riastrad static int
    101   1.6  riastrad drm_init(void)
    102   1.6  riastrad {
    103   1.6  riastrad 	extern int linux_guarantee_initialized(void);
    104   1.6  riastrad 	int error;
    105   1.6  riastrad 
    106   1.6  riastrad 	error = linux_guarantee_initialized();
    107   1.6  riastrad 	if (error)
    108   1.6  riastrad 		return error;
    109   1.6  riastrad 
    110  1.15  riastrad 	drm_agp_hooks_init();
    111  1.15  riastrad #if NAGP > 0
    112  1.15  riastrad 	extern int drmkms_agp_guarantee_initialized(void);
    113  1.15  riastrad 	error = drmkms_agp_guarantee_initialized();
    114  1.15  riastrad 	if (error) {
    115  1.15  riastrad 		drm_agp_hooks_fini();
    116  1.15  riastrad 		return error;
    117  1.15  riastrad 	}
    118  1.15  riastrad #endif
    119  1.15  riastrad 
    120   1.6  riastrad 	if (ISSET(boothowto, AB_DEBUG))
    121  1.16       mrg 		drm_debug = DRM_UT_CORE | DRM_UT_DRIVER | DRM_UT_KMS;
    122   1.6  riastrad 
    123   1.6  riastrad 	spin_lock_init(&drm_minor_lock);
    124   1.6  riastrad 	idr_init(&drm_minors_idr);
    125   1.6  riastrad 	linux_mutex_init(&drm_global_mutex);
    126   1.6  riastrad 	drm_connector_ida_init();
    127   1.7  riastrad 	drm_global_init();
    128  1.17  jmcneill 	drm_panel_init_lock();
    129  1.17  jmcneill 	drm_bridge_init_lock();
    130   1.9  christos 	drm_sysctl_init(&drm_def);
    131  1.10  riastrad 	drm_i2c_encoders_init();
    132   1.6  riastrad 
    133   1.6  riastrad 	return 0;
    134   1.6  riastrad }
    135   1.6  riastrad 
    136   1.6  riastrad int
    137   1.6  riastrad drm_guarantee_initialized(void)
    138   1.6  riastrad {
    139   1.5  riastrad #ifdef _MODULE
    140   1.6  riastrad 	return 0;
    141   1.5  riastrad #else
    142   1.6  riastrad 	static ONCE_DECL(drm_init_once);
    143   1.6  riastrad 
    144   1.6  riastrad 	return RUN_ONCE(&drm_init_once, &drm_init);
    145   1.2  riastrad #endif
    146   1.6  riastrad }
    147   1.6  riastrad 
    148   1.6  riastrad static void
    149   1.6  riastrad drm_fini(void)
    150   1.6  riastrad {
    151  1.10  riastrad 
    152  1.10  riastrad 	drm_i2c_encoders_fini();
    153   1.9  christos 	drm_sysctl_fini(&drm_def);
    154  1.17  jmcneill 	drm_bridge_fini_lock();
    155  1.17  jmcneill 	drm_panel_fini_lock();
    156   1.7  riastrad 	drm_global_release();
    157   1.6  riastrad 	drm_connector_ida_destroy();
    158   1.6  riastrad 	linux_mutex_destroy(&drm_global_mutex);
    159   1.6  riastrad 	idr_destroy(&drm_minors_idr);
    160   1.6  riastrad 	spin_lock_destroy(&drm_minor_lock);
    161  1.15  riastrad 	drm_agp_hooks_fini();
    162   1.6  riastrad }
    163   1.2  riastrad 
    164  1.12  riastrad int
    165  1.12  riastrad drm_irq_by_busid(struct drm_device *dev, void *data, struct drm_file *file)
    166  1.12  riastrad {
    167  1.12  riastrad 
    168  1.12  riastrad 	return -ENODEV;
    169  1.12  riastrad }
    170  1.12  riastrad 
    171   1.2  riastrad static int
    172   1.2  riastrad drmkms_modcmd(modcmd_t cmd, void *arg __unused)
    173   1.2  riastrad {
    174   1.2  riastrad #ifdef _MODULE
    175   1.2  riastrad 	devmajor_t bmajor = NODEVMAJOR, cmajor = NODEVMAJOR;
    176   1.6  riastrad #endif
    177   1.2  riastrad 	int error;
    178   1.2  riastrad 
    179   1.2  riastrad 	switch (cmd) {
    180   1.2  riastrad 	case MODULE_CMD_INIT:
    181   1.2  riastrad #ifdef _MODULE
    182   1.6  riastrad 		error = drm_init();
    183   1.6  riastrad #else
    184   1.6  riastrad 		error = drm_guarantee_initialized();
    185   1.6  riastrad #endif
    186   1.6  riastrad 		if (error)
    187   1.6  riastrad 			return error;
    188   1.6  riastrad #ifdef _MODULE
    189   1.2  riastrad 		error = devsw_attach("drm", NULL, &bmajor,
    190   1.2  riastrad 		    &drm_cdevsw, &cmajor);
    191   1.2  riastrad 		if (error) {
    192   1.2  riastrad 			aprint_error("drmkms: unable to attach devsw: %d\n",
    193   1.2  riastrad 			    error);
    194   1.6  riastrad 			return error;
    195   1.2  riastrad 		}
    196   1.2  riastrad #endif
    197   1.2  riastrad 		return 0;
    198   1.2  riastrad 
    199   1.2  riastrad 	case MODULE_CMD_FINI:
    200   1.2  riastrad #ifdef _MODULE
    201   1.2  riastrad 		error = devsw_detach(NULL, &drm_cdevsw);
    202   1.2  riastrad 		if (error)
    203   1.2  riastrad 			return error;
    204   1.2  riastrad #endif
    205   1.6  riastrad 		drm_fini();
    206   1.2  riastrad 		return 0;
    207   1.2  riastrad 
    208   1.2  riastrad 	default:
    209   1.2  riastrad 		return ENOTTY;
    210   1.2  riastrad 	}
    211   1.2  riastrad }
    212