1 /*- 2 * Copyright (c) 2014 Ruslan Bukin <[email protected]> 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 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/bus.h> 39 #include <sys/cdefs.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/malloc.h> 43 #include <sys/rman.h> 44 #include <sys/timeet.h> 45 #include <sys/timetc.h> 46 #include <sys/conf.h> 47 #include <sys/uio.h> 48 #include <sys/stat.h> 49 #include <sys/time.h> 50 #include <sys/event.h> 51 #include <sys/selinfo.h> 52 #include <sys/endian.h> 53 #include <sys/rwlock.h> 54 55 #include <machine/bus.h> 56 #include <machine/fdt.h> 57 #include <machine/cpu.h> 58 #include <machine/intr.h> 59 60 #include <dev/fdt/fdt_common.h> 61 #include <dev/ofw/openfirm.h> 62 #include <dev/ofw/ofw_bus.h> 63 #include <dev/ofw/ofw_bus_subr.h> 64 65 #include <dev/beri/virtio/virtio.h> 66 #include <dev/virtio/virtqueue.h> 67 #include <dev/virtio/virtio_ring.h> 68 #include <dev/altera/pio/pio.h> 69 70 #include "pio_if.h" 71 72 int 73 vq_ring_ready(struct vqueue_info *vq) 74 { 75 76 return (vq->vq_flags & VQ_ALLOC); 77 } 78 79 int 80 vq_has_descs(struct vqueue_info *vq) 81 { 82 83 return (vq_ring_ready(vq) && vq->vq_last_avail != 84 be16toh(vq->vq_avail->idx)); 85 } 86 87 void * 88 paddr_map(uint32_t offset, uint32_t phys, uint32_t size) 89 { 90 bus_space_handle_t bsh; 91 92 if (bus_space_map(fdtbus_bs_tag, (phys + offset), 93 size, 0, &bsh) != 0) { 94 panic("Couldn't map 0x%08x\n", (phys + offset)); 95 } 96 97 return (void *)(bsh); 98 } 99 100 void 101 paddr_unmap(void *phys, uint32_t size) 102 { 103 104 bus_space_unmap(fdtbus_bs_tag, (bus_space_handle_t)phys, size); 105 } 106 107 static inline void 108 _vq_record(uint32_t offs, int i, volatile struct vring_desc *vd, 109 struct iovec *iov, int n_iov, uint16_t *flags) { 110 if (i >= n_iov) 111 return; 112 113 iov[i].iov_base = paddr_map(offs, be64toh(vd->addr), 114 be32toh(vd->len)); 115 iov[i].iov_len = be32toh(vd->len); 116 if (flags != NULL) 117 flags[i] = be16toh(vd->flags); 118 } 119 120 int 121 vq_getchain(uint32_t offs, struct vqueue_info *vq, 122 struct iovec *iov, int n_iov, uint16_t *flags) 123 { 124 volatile struct vring_desc *vdir, *vindir, *vp; 125 int idx, ndesc, n_indir; 126 int head, next; 127 int i; 128 129 idx = vq->vq_last_avail; 130 ndesc = (be16toh(vq->vq_avail->idx) - idx); 131 if (ndesc == 0) 132 return (0); 133 134 head = be16toh(vq->vq_avail->ring[idx & (vq->vq_qsize - 1)]); 135 next = head; 136 137 for (i = 0; i < VQ_MAX_DESCRIPTORS; next = be16toh(vdir->next)) { 138 vdir = &vq->vq_desc[next]; 139 if ((be16toh(vdir->flags) & VRING_DESC_F_INDIRECT) == 0) { 140 _vq_record(offs, i, vdir, iov, n_iov, flags); 141 i++; 142 } else { 143 n_indir = be32toh(vdir->len) / 16; 144 vindir = paddr_map(offs, be64toh(vdir->addr), 145 be32toh(vdir->len)); 146 next = 0; 147 for (;;) { 148 vp = &vindir[next]; 149 _vq_record(offs, i, vp, iov, n_iov, flags); 150 i+=1; 151 if ((be16toh(vp->flags) & \ 152 VRING_DESC_F_NEXT) == 0) 153 break; 154 next = be16toh(vp->next); 155 } 156 paddr_unmap(__DEVOLATILE(void *, vindir), be32toh(vdir->len)); 157 } 158 159 if ((be16toh(vdir->flags) & VRING_DESC_F_NEXT) == 0) 160 return (i); 161 } 162 163 return (i); 164 } 165 166 void 167 vq_relchain(struct vqueue_info *vq, struct iovec *iov, int n, uint32_t iolen) 168 { 169 volatile struct vring_used_elem *vue; 170 volatile struct vring_used *vu; 171 uint16_t head, uidx, mask; 172 int i; 173 174 mask = vq->vq_qsize - 1; 175 vu = vq->vq_used; 176 head = be16toh(vq->vq_avail->ring[vq->vq_last_avail++ & mask]); 177 178 uidx = be16toh(vu->idx); 179 vue = &vu->ring[uidx++ & mask]; 180 vue->id = htobe32(head); 181 182 vue->len = htobe32(iolen); 183 vu->idx = htobe16(uidx); 184 185 /* Clean up */ 186 for (i = 0; i < n; i++) { 187 paddr_unmap((void *)iov[i].iov_base, iov[i].iov_len); 188 } 189 } 190 191 int 192 setup_pio(device_t dev, char *name, device_t *pio_dev) 193 { 194 phandle_t pio_node; 195 struct fdt_ic *ic; 196 phandle_t xref; 197 phandle_t node; 198 199 if ((node = ofw_bus_get_node(dev)) == -1) 200 return (ENXIO); 201 202 if (OF_searchencprop(node, name, &xref, 203 sizeof(xref)) == -1) { 204 return (ENXIO); 205 } 206 207 pio_node = OF_node_from_xref(xref); 208 SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) { 209 if (ic->iph == pio_node) { 210 *pio_dev = ic->dev; 211 return (0); 212 } 213 } 214 215 return (ENXIO); 216 } 217 218 int 219 setup_offset(device_t dev, uint32_t *offset) 220 { 221 pcell_t dts_value[2]; 222 phandle_t mem_node; 223 phandle_t xref; 224 phandle_t node; 225 int len; 226 227 if ((node = ofw_bus_get_node(dev)) == -1) 228 return (ENXIO); 229 230 if (OF_searchencprop(node, "beri-mem", &xref, 231 sizeof(xref)) == -1) { 232 return (ENXIO); 233 } 234 235 mem_node = OF_node_from_xref(xref); 236 if ((len = OF_getproplen(mem_node, "reg")) <= 0) 237 return (ENXIO); 238 OF_getencprop(mem_node, "reg", dts_value, len); 239 *offset = dts_value[0]; 240 241 return (0); 242 } 243 244 struct iovec * 245 getcopy(struct iovec *iov, int n) 246 { 247 struct iovec *tiov; 248 int i; 249 250 tiov = malloc(n * sizeof(struct iovec), M_DEVBUF, M_NOWAIT); 251 for (i = 0; i < n; i++) { 252 tiov[i].iov_base = iov[i].iov_base; 253 tiov[i].iov_len = iov[i].iov_len; 254 } 255 256 return (tiov); 257 } 258