Annotation of sys/arch/alpha/dev/sgmap_typedep.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sgmap_typedep.c,v 1.10 2006/05/21 01:42:43 brad Exp $ */
! 2: /* $NetBSD: sgmap_typedep.c,v 1.17 2001/07/19 04:27:37 thorpej Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: #ifdef SGMAP_DEBUG
! 42: int __C(SGMAP_TYPE,_debug) = 0;
! 43: #endif
! 44:
! 45: SGMAP_PTE_TYPE __C(SGMAP_TYPE,_prefetch_spill_page_pte);
! 46:
! 47: int __C(SGMAP_TYPE,_load_buffer)(bus_dma_tag_t,
! 48: bus_dmamap_t, void *buf, size_t buflen,
! 49: struct proc *, int, int, struct alpha_sgmap *);
! 50:
! 51: void
! 52: __C(SGMAP_TYPE,_init_spill_page_pte)(void)
! 53: {
! 54:
! 55: __C(SGMAP_TYPE,_prefetch_spill_page_pte) =
! 56: (alpha_sgmap_prefetch_spill_page_pa >>
! 57: SGPTE_PGADDR_SHIFT) | SGPTE_VALID;
! 58: }
! 59:
! 60: int
! 61: __C(SGMAP_TYPE,_load_buffer)(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
! 62: size_t buflen, struct proc *p, int flags, int seg,
! 63: struct alpha_sgmap *sgmap)
! 64: {
! 65: vaddr_t endva, va = (vaddr_t)buf;
! 66: paddr_t pa;
! 67: bus_addr_t dmaoffset, sgva;
! 68: bus_size_t sgvalen, boundary, alignment;
! 69: SGMAP_PTE_TYPE *pte, *page_table = sgmap->aps_pt;
! 70: int s, pteidx, error, spill;
! 71:
! 72: /* Initialize the spill page PTE if it hasn't been already. */
! 73: if (__C(SGMAP_TYPE,_prefetch_spill_page_pte) == 0)
! 74: __C(SGMAP_TYPE,_init_spill_page_pte)();
! 75:
! 76: /*
! 77: * Remember the offset into the first page and the total
! 78: * transfer length.
! 79: */
! 80: dmaoffset = ((u_long)buf) & PGOFSET;
! 81:
! 82: #ifdef SGMAP_DEBUG
! 83: if (__C(SGMAP_TYPE,_debug)) {
! 84: printf("sgmap_load: ----- buf = %p -----\n", buf);
! 85: printf("sgmap_load: dmaoffset = 0x%lx, buflen = 0x%lx\n",
! 86: dmaoffset, buflen);
! 87: }
! 88: #endif
! 89:
! 90: /*
! 91: * Allocate the necessary virtual address space for the
! 92: * mapping. Round the size, since we deal with whole pages.
! 93: */
! 94:
! 95: /*
! 96: * XXX Always allocate a spill page for now. Note
! 97: * the spill page is not needed for an in-bound-only
! 98: * transfer.
! 99: */
! 100: if ((flags & BUS_DMA_READ) == 0)
! 101: spill = 1;
! 102: else
! 103: spill = 0;
! 104:
! 105: endva = round_page(va + buflen);
! 106: va = trunc_page(va);
! 107:
! 108: boundary = map->_dm_boundary;
! 109: alignment = PAGE_SIZE;
! 110:
! 111: sgvalen = (endva - va);
! 112: if (spill) {
! 113: sgvalen += PAGE_SIZE;
! 114:
! 115: /*
! 116: * ARGH! If the addition of the spill page bumped us
! 117: * over our boundary, we have to 2x the boundary limit.
! 118: */
! 119: if (boundary && boundary < sgvalen) {
! 120: alignment = boundary;
! 121: do {
! 122: boundary <<= 1;
! 123: } while (boundary < sgvalen);
! 124: }
! 125: }
! 126:
! 127: #if 0
! 128: printf("len 0x%lx -> 0x%lx, boundary 0x%lx -> 0x%lx -> ",
! 129: (endva - va), sgvalen, map->_dm_boundary, boundary);
! 130: #endif
! 131:
! 132: s = splvm();
! 133: error = extent_alloc(sgmap->aps_ex, sgvalen, alignment, 0, boundary,
! 134: (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT : EX_WAITOK, &sgva);
! 135: splx(s);
! 136: if (error)
! 137: return (error);
! 138:
! 139: #if 0
! 140: printf("error %d sgva 0x%lx\n", error, sgva);
! 141: #endif
! 142:
! 143: pteidx = sgva >> SGMAP_ADDR_PTEIDX_SHIFT;
! 144: pte = &page_table[pteidx * SGMAP_PTE_SPACING];
! 145:
! 146: #ifdef SGMAP_DEBUG
! 147: if (__C(SGMAP_TYPE,_debug))
! 148: printf("sgmap_load: sgva = 0x%lx, pteidx = %d, "
! 149: "pte = %p (pt = %p)\n", sgva, pteidx, pte,
! 150: page_table);
! 151: #endif
! 152:
! 153: /* Generate the DMA address. */
! 154: map->dm_segs[seg].ds_addr = sgmap->aps_wbase | sgva | dmaoffset;
! 155: map->dm_segs[seg].ds_len = buflen;
! 156:
! 157: #ifdef SGMAP_DEBUG
! 158: if (__C(SGMAP_TYPE,_debug))
! 159: printf("sgmap_load: wbase = 0x%lx, vpage = 0x%x, "
! 160: "dma addr = 0x%lx\n", sgmap->aps_wbase, sgva,
! 161: map->dm_segs[seg].ds_addr);
! 162: #endif
! 163:
! 164: for (; va < endva; va += PAGE_SIZE, pteidx++,
! 165: pte = &page_table[pteidx * SGMAP_PTE_SPACING]) {
! 166: /* Get the physical address for this segment. */
! 167: if (p != NULL)
! 168: (void) pmap_extract(p->p_vmspace->vm_map.pmap, va, &pa);
! 169: else
! 170: pa = vtophys(va);
! 171:
! 172: /* Load the current PTE with this page. */
! 173: *pte = (pa >> SGPTE_PGADDR_SHIFT) | SGPTE_VALID;
! 174: #ifdef SGMAP_DEBUG
! 175: if (__C(SGMAP_TYPE,_debug))
! 176: printf("sgmap_load: pa = 0x%lx, pte = %p, "
! 177: "*pte = 0x%lx\n", pa, pte, (u_long)(*pte));
! 178: #endif
! 179: }
! 180:
! 181: if (spill) {
! 182: /* ...and the prefetch-spill page. */
! 183: *pte = __C(SGMAP_TYPE,_prefetch_spill_page_pte);
! 184: #ifdef SGMAP_DEBUG
! 185: if (__C(SGMAP_TYPE,_debug)) {
! 186: printf("sgmap_load: spill page, pte = %p, "
! 187: "*pte = 0x%lx\n", pte, *pte);
! 188: printf("sgmap_load: pte count = %d\n",
! 189: map->_dm_ptecnt);
! 190: }
! 191: #endif
! 192: }
! 193:
! 194: return (0);
! 195: }
! 196:
! 197: int
! 198: __C(SGMAP_TYPE,_load)(bus_dma_tag_t t, bus_dmamap_t map, void *buf,
! 199: bus_size_t buflen, struct proc *p, int flags, struct alpha_sgmap *sgmap)
! 200: {
! 201: int seg, error;
! 202:
! 203: /*
! 204: * Make sure that on error condition we return "no valid mappings".
! 205: */
! 206: map->dm_mapsize = 0;
! 207: map->dm_nsegs = 0;
! 208:
! 209: if (buflen > map->_dm_size)
! 210: return (EINVAL);
! 211:
! 212: KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0);
! 213: KASSERT((flags & (BUS_DMA_READ|BUS_DMA_WRITE)) !=
! 214: (BUS_DMA_READ|BUS_DMA_WRITE));
! 215:
! 216: map->_dm_flags |= flags & (BUS_DMA_READ|BUS_DMA_WRITE);
! 217:
! 218: seg = 0;
! 219: error = __C(SGMAP_TYPE,_load_buffer)(t, map, buf, buflen, p,
! 220: flags, seg, sgmap);
! 221:
! 222: alpha_mb();
! 223:
! 224: #if defined(SGMAP_DEBUG) && defined(DDB)
! 225: if (__C(SGMAP_TYPE,_debug) > 1)
! 226: Debugger();
! 227: #endif
! 228:
! 229: if (error == 0) {
! 230: map->dm_mapsize = buflen;
! 231: map->dm_nsegs = 1;
! 232: map->_dm_window = t;
! 233: } else {
! 234: map->_dm_flags &= ~(BUS_DMA_READ|BUS_DMA_WRITE);
! 235: if (t->_next_window != NULL) {
! 236: /* Give the next window a chance. */
! 237: error = bus_dmamap_load(t->_next_window, map, buf,
! 238: buflen, p, flags);
! 239: }
! 240: }
! 241: return (error);
! 242: }
! 243:
! 244: int
! 245: __C(SGMAP_TYPE,_load_mbuf)(bus_dma_tag_t t, bus_dmamap_t map,
! 246: struct mbuf *m0, int flags, struct alpha_sgmap *sgmap)
! 247: {
! 248: struct mbuf *m;
! 249: int seg, error;
! 250:
! 251: /*
! 252: * Make sure that on error condition we return "no valid mappings".
! 253: */
! 254: map->dm_mapsize = 0;
! 255: map->dm_nsegs = 0;
! 256:
! 257: #ifdef DIAGNOSTIC
! 258: if ((m0->m_flags & M_PKTHDR) == 0)
! 259: panic(__S(__C(SGMAP_TYPE,_load_mbuf)) ": no packet header");
! 260: #endif
! 261:
! 262: if (m0->m_pkthdr.len > map->_dm_size)
! 263: return (EINVAL);
! 264:
! 265: KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0);
! 266: KASSERT((flags & (BUS_DMA_READ|BUS_DMA_WRITE)) !=
! 267: (BUS_DMA_READ|BUS_DMA_WRITE));
! 268:
! 269: map->_dm_flags |= flags & (BUS_DMA_READ|BUS_DMA_WRITE);
! 270:
! 271: seg = 0;
! 272: error = 0;
! 273: for (m = m0; m != NULL && error == 0; m = m->m_next) {
! 274: if (m->m_len == 0)
! 275: continue;
! 276: error = __C(SGMAP_TYPE,_load_buffer)(t, map,
! 277: m->m_data, m->m_len, NULL, flags, seg, sgmap);
! 278: seg++;
! 279: }
! 280:
! 281: alpha_mb();
! 282:
! 283: #if defined(SGMAP_DEBUG) && defined(DDB)
! 284: if (__C(SGMAP_TYPE,_debug) > 1)
! 285: Debugger();
! 286: #endif
! 287:
! 288: if (error == 0) {
! 289: map->dm_mapsize = m0->m_pkthdr.len;
! 290: map->dm_nsegs = seg;
! 291: map->_dm_window = t;
! 292: } else {
! 293: /* Need to back out what we've done so far. */
! 294: map->dm_nsegs = seg - 1;
! 295: __C(SGMAP_TYPE,_unload)(t, map, sgmap);
! 296: map->_dm_flags &= ~(BUS_DMA_READ|BUS_DMA_WRITE);
! 297: if (t->_next_window != NULL) {
! 298: /* Give the next window a chance. */
! 299: error = bus_dmamap_load_mbuf(t->_next_window, map,
! 300: m0, flags);
! 301: }
! 302: }
! 303:
! 304: return (error);
! 305: }
! 306:
! 307: int
! 308: __C(SGMAP_TYPE,_load_uio)(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio,
! 309: int flags, struct alpha_sgmap *sgmap)
! 310: {
! 311: bus_size_t minlen, resid;
! 312: struct proc *p = NULL;
! 313: struct iovec *iov;
! 314: caddr_t addr;
! 315: int i, seg, error;
! 316:
! 317: /*
! 318: * Make sure that on error condition we return "no valid mappings".
! 319: */
! 320: map->dm_mapsize = 0;
! 321: map->dm_nsegs = 0;
! 322:
! 323: KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0);
! 324: KASSERT((flags & (BUS_DMA_READ|BUS_DMA_WRITE)) !=
! 325: (BUS_DMA_READ|BUS_DMA_WRITE));
! 326:
! 327: map->_dm_flags |= flags & (BUS_DMA_READ|BUS_DMA_WRITE);
! 328:
! 329: resid = uio->uio_resid;
! 330: iov = uio->uio_iov;
! 331:
! 332: if (uio->uio_segflg == UIO_USERSPACE) {
! 333: p = uio->uio_procp;
! 334: #ifdef DIAGNOSTIC
! 335: if (p == NULL)
! 336: panic(__S(__C(SGMAP_TYPE,_load_uio))
! 337: ": USERSPACE but no proc");
! 338: #endif
! 339: }
! 340:
! 341: seg = 0;
! 342: error = 0;
! 343: for (i = 0; i < uio->uio_iovcnt && resid != 0 && error == 0;
! 344: i++, seg++) {
! 345: /*
! 346: * Now at the first iovec to load. Load each iovec
! 347: * until we have exhausted the residual count.
! 348: */
! 349: minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len;
! 350: addr = (caddr_t)iov[i].iov_base;
! 351:
! 352: error = __C(SGMAP_TYPE,_load_buffer)(t, map,
! 353: addr, minlen, p, flags, seg, sgmap);
! 354:
! 355: resid -= minlen;
! 356: }
! 357:
! 358: alpha_mb();
! 359:
! 360: #if defined(SGMAP_DEBUG) && defined(DDB)
! 361: if (__C(SGMAP_TYPE,_debug) > 1)
! 362: Debugger();
! 363: #endif
! 364:
! 365: if (error == 0) {
! 366: map->dm_mapsize = uio->uio_resid;
! 367: map->dm_nsegs = seg;
! 368: } else {
! 369: /* Need to back out what we've done so far. */
! 370: map->dm_nsegs = seg - 1;
! 371: __C(SGMAP_TYPE,_unload)(t, map, sgmap);
! 372: map->_dm_flags &= ~(BUS_DMA_READ|BUS_DMA_WRITE);
! 373: if (t->_next_window != NULL) {
! 374: /* Give the next window a chance. */
! 375: error = bus_dmamap_load_uio(t->_next_window, map,
! 376: uio, flags);
! 377: }
! 378: }
! 379:
! 380: return (error);
! 381: }
! 382:
! 383: int
! 384: __C(SGMAP_TYPE,_load_raw)(bus_dma_tag_t t, bus_dmamap_t map,
! 385: bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags,
! 386: struct alpha_sgmap *sgmap)
! 387: {
! 388: KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0);
! 389: KASSERT((flags & (BUS_DMA_READ|BUS_DMA_WRITE)) !=
! 390: (BUS_DMA_READ|BUS_DMA_WRITE));
! 391:
! 392: panic(__S(__C(SGMAP_TYPE,_load_raw)) ": not implemented");
! 393: }
! 394:
! 395: void
! 396: __C(SGMAP_TYPE,_unload)(bus_dma_tag_t t, bus_dmamap_t map,
! 397: struct alpha_sgmap *sgmap)
! 398: {
! 399: SGMAP_PTE_TYPE *pte, *page_table = sgmap->aps_pt;
! 400: bus_addr_t osgva, sgva, esgva;
! 401: int s, error, spill, seg, pteidx;
! 402:
! 403: for (seg = 0; seg < map->dm_nsegs; seg++) {
! 404: /*
! 405: * XXX Always allocate a spill page for now. Note
! 406: * the spill page is not needed for an in-bound-only
! 407: * transfer.
! 408: */
! 409: if ((map->_dm_flags & BUS_DMA_READ) == 0)
! 410: spill = 1;
! 411: else
! 412: spill = 0;
! 413:
! 414: sgva = map->dm_segs[seg].ds_addr & ~sgmap->aps_wbase;
! 415:
! 416: esgva = round_page(sgva + map->dm_segs[seg].ds_len);
! 417: osgva = sgva = trunc_page(sgva);
! 418:
! 419: if (spill)
! 420: esgva += PAGE_SIZE;
! 421:
! 422: /* Invalidate the PTEs for the mapping. */
! 423: for (pteidx = sgva >> SGMAP_ADDR_PTEIDX_SHIFT;
! 424: sgva < esgva; sgva += PAGE_SIZE, pteidx++) {
! 425: pte = &page_table[pteidx * SGMAP_PTE_SPACING];
! 426: #ifdef SGMAP_DEBUG
! 427: if (__C(SGMAP_TYPE,_debug))
! 428: printf("sgmap_unload: pte = %p, "
! 429: "*pte = 0x%lx\n", pte, (u_long)(*pte));
! 430: #endif
! 431: *pte = 0;
! 432: }
! 433:
! 434: alpha_mb();
! 435:
! 436: /* Free the virtual address space used by the mapping. */
! 437: s = splvm();
! 438: error = extent_free(sgmap->aps_ex, osgva, (esgva - osgva),
! 439: EX_NOWAIT);
! 440: splx(s);
! 441: if (error != 0)
! 442: panic(__S(__C(SGMAP_TYPE,_unload)));
! 443: }
! 444:
! 445: map->_dm_flags &= ~(BUS_DMA_READ|BUS_DMA_WRITE);
! 446:
! 447: /* Mark the mapping invalid. */
! 448: map->dm_mapsize = 0;
! 449: map->dm_nsegs = 0;
! 450: map->_dm_window = NULL;
! 451: }
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