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      1 /*	$NetBSD: genfb_vmbus.c,v 1.3 2021/08/07 16:19:11 thorpej Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 Michael Lorenz
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: genfb_vmbus.c,v 1.3 2021/08/07 16:19:11 thorpej Exp $");
     31 
     32 #include "opt_wsfb.h"
     33 #include "opt_genfb.h"
     34 
     35 #include <sys/param.h>
     36 #include <sys/systm.h>
     37 #include <sys/kernel.h>
     38 #include <sys/device.h>
     39 #include <sys/proc.h>
     40 #include <sys/mutex.h>
     41 #include <sys/ioctl.h>
     42 #include <sys/systm.h>
     43 #include <sys/kauth.h>
     44 
     45 #include <dev/wsfb/genfbvar.h>
     46 
     47 #include <dev/hyperv/vmbusvar.h>
     48 #include <dev/hyperv/genfb_vmbusvar.h>
     49 
     50 static int	genfb_vmbus_match(device_t, cfdata_t, void *);
     51 static void	genfb_vmbus_attach(device_t, device_t, void *);
     52 static int	genfb_vmbus_ioctl(void *, void *, u_long, void *, int,
     53 		    struct lwp *);
     54 static paddr_t	genfb_vmbus_mmap(void *, void *, off_t, int);
     55 static int	genfb_vmbus_drm_print(void *, const char *);
     56 static bool	genfb_vmbus_shutdown(device_t, int);
     57 
     58 CFATTACH_DECL_NEW(genfb_vmbus, sizeof(struct genfb_vmbus_softc),
     59     genfb_vmbus_match, genfb_vmbus_attach, NULL, NULL);
     60 
     61 static int
     62 genfb_vmbus_match(device_t parent, cfdata_t match, void *aux)
     63 {
     64 	struct vmbus_attach_args *aa = aux;
     65 
     66 	if (memcmp(aa->aa_type, &hyperv_guid_video, sizeof(*aa->aa_type)) != 0)
     67 		return 0;
     68 
     69 	if (!genfb_is_enabled())
     70 		return 0;	/* explicitly disabled by MD code */
     71 
     72 	/* Use genfb(4) at pci in Gen.1 VM. */
     73 	if (hyperv_is_gen1())
     74 		return 0;
     75 
     76 	return 1;
     77 }
     78 
     79 static void
     80 genfb_vmbus_attach(device_t parent, device_t self, void *aux)
     81 {
     82 	static const struct genfb_ops zero_ops;
     83 	struct genfb_vmbus_softc *sc = device_private(self);
     84 	struct vmbus_attach_args *aa = aux;
     85 	struct genfb_ops ops = zero_ops;
     86 
     87 	aprint_naive("\n");
     88 	aprint_normal(": Hyper-V Synthetic Video\n");
     89 
     90 	sc->sc_gen.sc_dev = self;
     91 	sc->sc_memt = aa->aa_memt;
     92 
     93 	genfb_init(&sc->sc_gen);
     94 
     95 	/* firmware / MD code responsible for restoring the display */
     96 	if (sc->sc_gen.sc_pmfcb == NULL)
     97 		pmf_device_register1(self, NULL, NULL,
     98 		    genfb_vmbus_shutdown);
     99 	else
    100 		pmf_device_register1(self,
    101 		    sc->sc_gen.sc_pmfcb->gpc_suspend,
    102 		    sc->sc_gen.sc_pmfcb->gpc_resume,
    103 		    genfb_vmbus_shutdown);
    104 
    105 	if ((sc->sc_gen.sc_width == 0) || (sc->sc_gen.sc_fbsize == 0)) {
    106 		aprint_debug_dev(self, "not configured by firmware\n");
    107 		return;
    108 	}
    109 
    110 	ops.genfb_ioctl = genfb_vmbus_ioctl;
    111 	ops.genfb_mmap = genfb_vmbus_mmap;
    112 
    113 	if (genfb_attach(&sc->sc_gen, &ops) != 0)
    114 		return;
    115 
    116 	/* now try to attach a DRM */
    117 	config_found(self, aux, genfb_vmbus_drm_print,
    118 	    CFARGS(.iattr = "drm"));
    119 }
    120 
    121 static int
    122 genfb_vmbus_drm_print(void *aux, const char *pnp)
    123 {
    124 
    125 	if (pnp)
    126 		aprint_normal("drm at %s", pnp);
    127 	return UNCONF;
    128 }
    129 
    130 static int
    131 genfb_vmbus_ioctl(void *v, void *vs, u_long cmd, void *data, int flag,
    132     struct lwp *l)
    133 {
    134 
    135 	switch (cmd) {
    136 	case WSDISPLAYIO_GTYPE:
    137 		*(u_int *)data = WSDISPLAY_TYPE_GENFB;
    138 		return 0;
    139 	}
    140 
    141 	return EPASSTHROUGH;
    142 }
    143 
    144 static paddr_t
    145 genfb_vmbus_mmap(void *v, void *vs, off_t offset, int prot)
    146 {
    147 	struct genfb_vmbus_softc *sc = v;
    148 
    149 	return bus_space_mmap(sc->sc_memt, sc->sc_gen.sc_fboffset, offset, prot,
    150 	    BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_PREFETCHABLE);
    151 }
    152 
    153 static bool
    154 genfb_vmbus_shutdown(device_t self, int flags)
    155 {
    156 
    157 	genfb_enable_polling(self);
    158 	return true;
    159 }
    160