1 /*- 2 * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com> 3 * All rights reserved. 4 * 5 * This software was developed by SRI International and the University of 6 * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237) 7 * ("CTSRD"), as part of the DARPA CRASH research programme. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 /* 32 * BERI virtio mmio backend common methods 33 */ 34 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/bus.h> 41 #include <sys/cdefs.h> 42 #include <sys/kernel.h> 43 #include <sys/module.h> 44 #include <sys/malloc.h> 45 #include <sys/rman.h> 46 #include <sys/timeet.h> 47 #include <sys/timetc.h> 48 #include <sys/conf.h> 49 #include <sys/uio.h> 50 #include <sys/stat.h> 51 #include <sys/time.h> 52 #include <sys/event.h> 53 #include <sys/selinfo.h> 54 #include <sys/endian.h> 55 #include <sys/rwlock.h> 56 57 #include <machine/bus.h> 58 #include <machine/fdt.h> 59 #include <machine/cpu.h> 60 #include <machine/intr.h> 61 62 #include <dev/fdt/fdt_common.h> 63 #include <dev/ofw/openfirm.h> 64 #include <dev/ofw/ofw_bus.h> 65 #include <dev/ofw/ofw_bus_subr.h> 66 67 #include <dev/beri/virtio/virtio.h> 68 #include <dev/virtio/virtqueue.h> 69 #include <dev/virtio/virtio_ring.h> 70 #include <dev/altera/pio/pio.h> 71 72 #include "pio_if.h" 73 74 int 75 vq_ring_ready(struct vqueue_info *vq) 76 { 77 78 return (vq->vq_flags & VQ_ALLOC); 79 } 80 81 int 82 vq_has_descs(struct vqueue_info *vq) 83 { 84 85 return (vq_ring_ready(vq) && vq->vq_last_avail != 86 be16toh(vq->vq_avail->idx)); 87 } 88 89 void * 90 paddr_map(uint32_t offset, uint32_t phys, uint32_t size) 91 { 92 bus_space_handle_t bsh; 93 94 if (bus_space_map(fdtbus_bs_tag, (phys + offset), 95 size, 0, &bsh) != 0) { 96 panic("Couldn't map 0x%08x\n", (phys + offset)); 97 } 98 99 return (void *)(bsh); 100 } 101 102 void 103 paddr_unmap(void *phys, uint32_t size) 104 { 105 106 bus_space_unmap(fdtbus_bs_tag, (bus_space_handle_t)phys, size); 107 } 108 109 static inline void 110 _vq_record(uint32_t offs, int i, volatile struct vring_desc *vd, 111 struct iovec *iov, int n_iov, uint16_t *flags) { 112 if (i >= n_iov) 113 return; 114 115 iov[i].iov_base = paddr_map(offs, be64toh(vd->addr), 116 be32toh(vd->len)); 117 iov[i].iov_len = be32toh(vd->len); 118 if (flags != NULL) 119 flags[i] = be16toh(vd->flags); 120 } 121 122 int 123 vq_getchain(uint32_t offs, struct vqueue_info *vq, 124 struct iovec *iov, int n_iov, uint16_t *flags) 125 { 126 volatile struct vring_desc *vdir, *vindir, *vp; 127 int idx, ndesc, n_indir; 128 int head, next; 129 int i; 130 131 idx = vq->vq_last_avail; 132 ndesc = (be16toh(vq->vq_avail->idx) - idx); 133 if (ndesc == 0) 134 return (0); 135 136 head = be16toh(vq->vq_avail->ring[idx & (vq->vq_qsize - 1)]); 137 next = head; 138 139 for (i = 0; i < VQ_MAX_DESCRIPTORS; next = be16toh(vdir->next)) { 140 vdir = &vq->vq_desc[next]; 141 if ((be16toh(vdir->flags) & VRING_DESC_F_INDIRECT) == 0) { 142 _vq_record(offs, i, vdir, iov, n_iov, flags); 143 i++; 144 } else { 145 n_indir = be32toh(vdir->len) / 16; 146 vindir = paddr_map(offs, be64toh(vdir->addr), 147 be32toh(vdir->len)); 148 next = 0; 149 for (;;) { 150 vp = &vindir[next]; 151 _vq_record(offs, i, vp, iov, n_iov, flags); 152 i+=1; 153 if ((be16toh(vp->flags) & \ 154 VRING_DESC_F_NEXT) == 0) 155 break; 156 next = be16toh(vp->next); 157 } 158 paddr_unmap(__DEVOLATILE(void *, vindir), be32toh(vdir->len)); 159 } 160 161 if ((be16toh(vdir->flags) & VRING_DESC_F_NEXT) == 0) 162 return (i); 163 } 164 165 return (i); 166 } 167 168 void 169 vq_relchain(struct vqueue_info *vq, struct iovec *iov, int n, uint32_t iolen) 170 { 171 volatile struct vring_used_elem *vue; 172 volatile struct vring_used *vu; 173 uint16_t head, uidx, mask; 174 int i; 175 176 mask = vq->vq_qsize - 1; 177 vu = vq->vq_used; 178 head = be16toh(vq->vq_avail->ring[vq->vq_last_avail++ & mask]); 179 180 uidx = be16toh(vu->idx); 181 vue = &vu->ring[uidx++ & mask]; 182 vue->id = htobe32(head); 183 184 vue->len = htobe32(iolen); 185 vu->idx = htobe16(uidx); 186 187 /* Clean up */ 188 for (i = 0; i < n; i++) { 189 paddr_unmap((void *)iov[i].iov_base, iov[i].iov_len); 190 } 191 } 192 193 int 194 setup_pio(device_t dev, char *name, device_t *pio_dev) 195 { 196 phandle_t pio_node; 197 struct fdt_ic *ic; 198 phandle_t xref; 199 phandle_t node; 200 201 if ((node = ofw_bus_get_node(dev)) == -1) 202 return (ENXIO); 203 204 if (OF_searchencprop(node, name, &xref, 205 sizeof(xref)) == -1) { 206 return (ENXIO); 207 } 208 209 pio_node = OF_node_from_xref(xref); 210 SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) { 211 if (ic->iph == pio_node) { 212 *pio_dev = ic->dev; 213 return (0); 214 } 215 } 216 217 return (ENXIO); 218 } 219 220 int 221 setup_offset(device_t dev, uint32_t *offset) 222 { 223 pcell_t dts_value[2]; 224 phandle_t mem_node; 225 phandle_t xref; 226 phandle_t node; 227 int len; 228 229 if ((node = ofw_bus_get_node(dev)) == -1) 230 return (ENXIO); 231 232 if (OF_searchencprop(node, "beri-mem", &xref, 233 sizeof(xref)) == -1) { 234 return (ENXIO); 235 } 236 237 mem_node = OF_node_from_xref(xref); 238 if ((len = OF_getproplen(mem_node, "reg")) <= 0) 239 return (ENXIO); 240 OF_getencprop(mem_node, "reg", dts_value, len); 241 *offset = dts_value[0]; 242 243 return (0); 244 } 245 246 struct iovec * 247 getcopy(struct iovec *iov, int n) 248 { 249 struct iovec *tiov; 250 int i; 251 252 tiov = malloc(n * sizeof(struct iovec), M_DEVBUF, M_NOWAIT); 253 for (i = 0; i < n; i++) { 254 tiov[i].iov_base = iov[i].iov_base; 255 tiov[i].iov_len = iov[i].iov_len; 256 } 257 258 return (tiov); 259 } 260