1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Internal PCI Fast DVMA implementation 28 */ 29 #include <sys/types.h> 30 #include <sys/kmem.h> 31 #include <sys/async.h> 32 #include <sys/sysmacros.h> 33 #include <sys/sunddi.h> 34 #include <sys/ddi_impldefs.h> 35 #include <sys/dvma.h> 36 #include "px_obj.h" 37 38 /*LINTLIBRARY*/ 39 40 static struct dvma_ops fdvma_ops; 41 typedef struct fast_dvma fdvma_t; 42 43 /* 44 * The following routines are used to implement the sun4u fast dvma 45 * routines on this bus. 46 */ 47 48 /*ARGSUSED*/ 49 static void 50 px_fdvma_load(ddi_dma_handle_t h, caddr_t a, uint_t len, uint_t index, 51 ddi_dma_cookie_t *cp) 52 { 53 ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h; 54 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 55 px_t *px_p = (px_t *)fdvma_p->softsp; 56 px_mmu_t *mmu_p = px_p->px_mmu_p; 57 dev_info_t *dip = px_p->px_dip; 58 px_dvma_addr_t dvma_addr, dvma_pg; 59 uint32_t offset; 60 size_t npages, pg_index; 61 io_attributes_t attr; 62 63 offset = (uint32_t)(uintptr_t)a & MMU_PAGE_OFFSET; 64 npages = MMU_BTOPR(len + offset); 65 if (!npages) 66 return; 67 68 /* make sure we don't exceed reserved boundary */ 69 DBG(DBG_FAST_DVMA, dip, "load index=%x: %p+%x ", index, a, len); 70 if (index + npages > mp->dmai_ndvmapages) { 71 cmn_err(px_panic_on_fatal_errors ? CE_PANIC : CE_WARN, 72 "%s%d: kaddr_load index(%x)+pgs(%lx) exceeds limit\n", 73 ddi_driver_name(dip), ddi_get_instance(dip), 74 index, npages); 75 return; 76 } 77 fdvma_p->pagecnt[index] = npages; 78 79 dvma_addr = mp->dmai_mapping + MMU_PTOB(index); 80 dvma_pg = MMU_BTOP(dvma_addr); 81 pg_index = dvma_pg - mmu_p->dvma_base_pg; 82 83 /* construct the dma cookie to be returned */ 84 MAKE_DMA_COOKIE(cp, dvma_addr | offset, len); 85 DBG(DBG_FAST_DVMA | DBG_CONT, dip, "cookie: %x+%x\n", 86 cp->dmac_address, cp->dmac_size); 87 88 attr = PX_GET_TTE_ATTR(mp->dmai_rflags, mp->dmai_attr.dma_attr_flags); 89 90 if (px_lib_iommu_map(dip, PCI_TSBID(0, pg_index), npages, 91 PX_ADD_ATTR_EXTNS(attr, mp->dmai_bdf), (void *)a, 0, 92 MMU_MAP_BUF) != DDI_SUCCESS) { 93 cmn_err(CE_WARN, "%s%d: kaddr_load can't get " 94 "page frame for vaddr %lx", ddi_driver_name(dip), 95 ddi_get_instance(dip), (uintptr_t)a); 96 } 97 } 98 99 /*ARGSUSED*/ 100 static void 101 px_fdvma_unload(ddi_dma_handle_t h, uint_t index, uint_t sync_flag) 102 { 103 ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h; 104 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 105 px_t *px_p = (px_t *)fdvma_p->softsp; 106 size_t npages = fdvma_p->pagecnt[index]; 107 px_dvma_addr_t dvma_pg = MMU_BTOP(mp->dmai_mapping + MMU_PTOB(index)); 108 109 DBG(DBG_FAST_DVMA, px_p->px_dip, 110 "unload index=%x sync_flag=%x %x+%x+%x\n", index, sync_flag, 111 mp->dmai_mapping, MMU_PTOB(index), MMU_PTOB(npages)); 112 113 px_mmu_unmap_pages(px_p->px_mmu_p, mp, dvma_pg, npages); 114 fdvma_p->pagecnt[index] = 0; 115 } 116 117 /*ARGSUSED*/ 118 static void 119 px_fdvma_sync(ddi_dma_handle_t h, uint_t index, uint_t sync_flag) 120 { 121 ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h; 122 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 123 px_t *px_p = (px_t *)fdvma_p->softsp; 124 size_t npg = fdvma_p->pagecnt[index]; 125 126 DBG(DBG_FAST_DVMA, px_p->px_dip, 127 "sync index=%x sync_flag=%x %x+%x+%x\n", index, sync_flag, 128 mp->dmai_mapping, MMU_PTOB(index), MMU_PTOB(npg)); 129 } 130 131 int 132 px_fdvma_reserve(dev_info_t *dip, dev_info_t *rdip, px_t *px_p, 133 ddi_dma_req_t *dmareq, ddi_dma_handle_t *handlep) 134 { 135 fdvma_t *fdvma_p; 136 px_dvma_addr_t dvma_pg; 137 px_mmu_t *mmu_p = px_p->px_mmu_p; 138 size_t npages; 139 ddi_dma_impl_t *mp; 140 ddi_dma_lim_t *lim_p = dmareq->dmar_limits; 141 ulong_t hi = lim_p->dlim_addr_hi; 142 ulong_t lo = lim_p->dlim_addr_lo; 143 size_t counter_max = (lim_p->dlim_cntr_max + 1) & MMU_PAGE_MASK; 144 145 if (px_disable_fdvma) 146 return (DDI_FAILURE); 147 148 DBG(DBG_DMA_CTL, dip, "DDI_DMA_RESERVE: rdip=%s%d\n", 149 ddi_driver_name(rdip), ddi_get_instance(rdip)); 150 151 /* 152 * Check the limit structure. 153 */ 154 if ((lo >= hi) || (hi < mmu_p->mmu_dvma_base)) 155 return (DDI_DMA_BADLIMITS); 156 157 /* 158 * Check the size of the request. 159 */ 160 npages = dmareq->dmar_object.dmao_size; 161 if (npages > mmu_p->mmu_dvma_reserve) 162 return (DDI_DMA_NORESOURCES); 163 164 /* 165 * Allocate the dma handle. 166 */ 167 mp = kmem_zalloc(sizeof (px_dma_hdl_t), KM_SLEEP); 168 169 /* 170 * Get entries from dvma space map. 171 * (vmem_t *vmp, 172 * size_t size, size_t align, size_t phase, 173 * size_t nocross, void *minaddr, void *maxaddr, int vmflag) 174 */ 175 dvma_pg = MMU_BTOP((ulong_t)vmem_xalloc(mmu_p->mmu_dvma_map, 176 MMU_PTOB(npages), MMU_PAGE_SIZE, 0, 177 counter_max, (void *)lo, (void *)(hi + 1), 178 dmareq->dmar_fp == DDI_DMA_SLEEP ? VM_SLEEP : VM_NOSLEEP)); 179 if (dvma_pg == 0) { 180 kmem_free(mp, sizeof (px_dma_hdl_t)); 181 return (DDI_DMA_NOMAPPING); 182 } 183 mmu_p->mmu_dvma_reserve -= npages; 184 185 /* 186 * Create the fast dvma request structure. 187 */ 188 fdvma_p = kmem_alloc(sizeof (fdvma_t), KM_SLEEP); 189 fdvma_p->pagecnt = kmem_alloc(npages * sizeof (uint_t), KM_SLEEP); 190 fdvma_p->ops = &fdvma_ops; 191 fdvma_p->softsp = (caddr_t)px_p; 192 fdvma_p->sync_flag = NULL; 193 194 /* 195 * Initialize the handle. 196 */ 197 mp->dmai_rdip = rdip; 198 mp->dmai_rflags = DMP_BYPASSNEXUS | DDI_DMA_READ | DMP_NOSYNC; 199 mp->dmai_burstsizes = dmareq->dmar_limits->dlim_burstsizes; 200 mp->dmai_mapping = MMU_PTOB(dvma_pg); 201 mp->dmai_ndvmapages = npages; 202 mp->dmai_size = npages * MMU_PAGE_SIZE; 203 mp->dmai_nwin = 0; 204 mp->dmai_fdvma = (caddr_t)fdvma_p; 205 206 /* 207 * The bdf protection value is set to immediate child 208 * at first. It gets modified by switch/bridge drivers 209 * as the code traverses down the fabric topology. 210 * 211 * XXX No IOMMU protection for broken devices. 212 */ 213 ASSERT((intptr_t)ddi_get_parent_data(rdip) >> 1 == 0); 214 mp->dmai_bdf = ((intptr_t)ddi_get_parent_data(rdip) == 1) ? 0 : 215 pcie_get_bdf_for_dma_xfer(dip, rdip); 216 217 DBG(DBG_DMA_CTL, dip, 218 "DDI_DMA_RESERVE: mp=%p dvma=%x npages=%x private=%p\n", 219 mp, mp->dmai_mapping, npages, fdvma_p); 220 *handlep = (ddi_dma_handle_t)mp; 221 return (DDI_SUCCESS); 222 } 223 224 int 225 px_fdvma_release(dev_info_t *dip, px_t *px_p, ddi_dma_impl_t *mp) 226 { 227 px_mmu_t *mmu_p = px_p->px_mmu_p; 228 size_t npages; 229 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 230 231 if (px_disable_fdvma) 232 return (DDI_FAILURE); 233 234 /* validate fdvma handle */ 235 if (!(mp->dmai_rflags & DMP_BYPASSNEXUS)) { 236 DBG(DBG_DMA_CTL, dip, "DDI_DMA_RELEASE: not fast dma\n"); 237 return (DDI_FAILURE); 238 } 239 240 /* flush all reserved dvma addresses from mmu */ 241 px_mmu_unmap_window(mmu_p, mp); 242 243 npages = mp->dmai_ndvmapages; 244 vmem_xfree(mmu_p->mmu_dvma_map, (void *)mp->dmai_mapping, 245 MMU_PTOB(npages)); 246 247 mmu_p->mmu_dvma_reserve += npages; 248 mp->dmai_ndvmapages = 0; 249 250 /* see if there is anyone waiting for dvma space */ 251 if (mmu_p->mmu_dvma_clid != 0) { 252 DBG(DBG_DMA_CTL, dip, "run dvma callback\n"); 253 ddi_run_callback(&mmu_p->mmu_dvma_clid); 254 } 255 256 /* free data structures */ 257 kmem_free(fdvma_p->pagecnt, npages * sizeof (uint_t)); 258 kmem_free(fdvma_p, sizeof (fdvma_t)); 259 kmem_free(mp, sizeof (px_dma_hdl_t)); 260 261 /* see if there is anyone waiting for kmem */ 262 if (px_kmem_clid != 0) { 263 DBG(DBG_DMA_CTL, dip, "run handle callback\n"); 264 ddi_run_callback(&px_kmem_clid); 265 } 266 return (DDI_SUCCESS); 267 } 268 269 static struct dvma_ops fdvma_ops = { 270 DVMAO_REV, 271 px_fdvma_load, 272 px_fdvma_unload, 273 px_fdvma_sync 274 }; 275