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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * Internal PCI Fast DVMA implementation 30 */ 31 #include <sys/types.h> 32 #include <sys/kmem.h> 33 #include <sys/async.h> 34 #include <sys/sysmacros.h> 35 #include <sys/sunddi.h> 36 #include <sys/ddi_impldefs.h> 37 #include <sys/dvma.h> 38 #include "px_obj.h" 39 40 /*LINTLIBRARY*/ 41 42 static struct dvma_ops fdvma_ops; 43 typedef struct fast_dvma fdvma_t; 44 45 /* 46 * The following routines are used to implement the sun4u fast dvma 47 * routines on this bus. 48 */ 49 50 /*ARGSUSED*/ 51 static void 52 px_fdvma_load(ddi_dma_handle_t h, caddr_t a, uint_t len, uint_t index, 53 ddi_dma_cookie_t *cp) 54 { 55 ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h; 56 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 57 px_t *px_p = (px_t *)fdvma_p->softsp; 58 px_mmu_t *mmu_p = px_p->px_mmu_p; 59 dev_info_t *dip = px_p->px_dip; 60 px_dvma_addr_t dvma_addr, dvma_pg; 61 uint32_t offset; 62 size_t npages, pg_index; 63 uint64_t attr; 64 65 offset = (uint32_t)(uintptr_t)a & MMU_PAGE_OFFSET; 66 npages = MMU_BTOPR(len + offset); 67 if (!npages) 68 return; 69 70 /* make sure we don't exceed reserved boundary */ 71 DBG(DBG_FAST_DVMA, dip, "load index=%x: %p+%x ", index, a, len); 72 if (index + npages > mp->dmai_ndvmapages) { 73 cmn_err(px_panic_on_fatal_errors ? CE_PANIC : CE_WARN, 74 "%s%d: kaddr_load index(%x)+pgs(%lx) exceeds limit\n", 75 ddi_driver_name(dip), ddi_get_instance(dip), 76 index, npages); 77 return; 78 } 79 fdvma_p->pagecnt[index] = npages; 80 81 dvma_addr = mp->dmai_mapping + MMU_PTOB(index); 82 dvma_pg = MMU_BTOP(dvma_addr); 83 pg_index = dvma_pg - mmu_p->dvma_base_pg; 84 85 /* construct the dma cookie to be returned */ 86 MAKE_DMA_COOKIE(cp, dvma_addr | offset, len); 87 DBG(DBG_FAST_DVMA | DBG_CONT, dip, "cookie: %x+%x\n", 88 cp->dmac_address, cp->dmac_size); 89 90 attr = PX_GET_TTE_ATTR(mp->dmai_rflags, mp->dmai_attr.dma_attr_flags); 91 92 if (px_lib_iommu_map(dip, PCI_TSBID(0, pg_index), npages, 93 PX_ADD_ATTR_EXTNS(attr, mp->dmai_bdf), (void *)a, 0, 94 MMU_MAP_BUF) != DDI_SUCCESS) { 95 cmn_err(CE_WARN, "%s%d: kaddr_load can't get " 96 "page frame for vaddr %lx", ddi_driver_name(dip), 97 ddi_get_instance(dip), (uintptr_t)a); 98 } 99 } 100 101 /*ARGSUSED*/ 102 static void 103 px_fdvma_unload(ddi_dma_handle_t h, uint_t index, uint_t sync_flag) 104 { 105 ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h; 106 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 107 px_t *px_p = (px_t *)fdvma_p->softsp; 108 size_t npages = fdvma_p->pagecnt[index]; 109 px_dvma_addr_t dvma_pg = MMU_BTOP(mp->dmai_mapping + MMU_PTOB(index)); 110 111 DBG(DBG_FAST_DVMA, px_p->px_dip, 112 "unload index=%x sync_flag=%x %x+%x+%x\n", index, sync_flag, 113 mp->dmai_mapping, MMU_PTOB(index), MMU_PTOB(npages)); 114 115 px_mmu_unmap_pages(px_p->px_mmu_p, mp, dvma_pg, npages); 116 fdvma_p->pagecnt[index] = 0; 117 } 118 119 /*ARGSUSED*/ 120 static void 121 px_fdvma_sync(ddi_dma_handle_t h, uint_t index, uint_t sync_flag) 122 { 123 ddi_dma_impl_t *mp = (ddi_dma_impl_t *)h; 124 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 125 px_t *px_p = (px_t *)fdvma_p->softsp; 126 size_t npg = fdvma_p->pagecnt[index]; 127 128 DBG(DBG_FAST_DVMA, px_p->px_dip, 129 "sync index=%x sync_flag=%x %x+%x+%x\n", index, sync_flag, 130 mp->dmai_mapping, MMU_PTOB(index), MMU_PTOB(npg)); 131 } 132 133 int 134 px_fdvma_reserve(dev_info_t *dip, dev_info_t *rdip, px_t *px_p, 135 ddi_dma_req_t *dmareq, ddi_dma_handle_t *handlep) 136 { 137 fdvma_t *fdvma_p; 138 px_dvma_addr_t dvma_pg; 139 px_mmu_t *mmu_p = px_p->px_mmu_p; 140 size_t npages; 141 ddi_dma_impl_t *mp; 142 ddi_dma_lim_t *lim_p = dmareq->dmar_limits; 143 ulong_t hi = lim_p->dlim_addr_hi; 144 ulong_t lo = lim_p->dlim_addr_lo; 145 size_t counter_max = (lim_p->dlim_cntr_max + 1) & MMU_PAGE_MASK; 146 147 if (px_disable_fdvma) 148 return (DDI_FAILURE); 149 150 DBG(DBG_DMA_CTL, dip, "DDI_DMA_RESERVE: rdip=%s%d\n", 151 ddi_driver_name(rdip), ddi_get_instance(rdip)); 152 153 /* 154 * Check the limit structure. 155 */ 156 if ((lo >= hi) || (hi < mmu_p->mmu_dvma_base)) 157 return (DDI_DMA_BADLIMITS); 158 159 /* 160 * Check the size of the request. 161 */ 162 npages = dmareq->dmar_object.dmao_size; 163 if (npages > mmu_p->mmu_dvma_reserve) 164 return (DDI_DMA_NORESOURCES); 165 166 /* 167 * Allocate the dma handle. 168 */ 169 mp = kmem_zalloc(sizeof (px_dma_hdl_t), KM_SLEEP); 170 171 /* 172 * Get entries from dvma space map. 173 * (vmem_t *vmp, 174 * size_t size, size_t align, size_t phase, 175 * size_t nocross, void *minaddr, void *maxaddr, int vmflag) 176 */ 177 dvma_pg = MMU_BTOP((ulong_t)vmem_xalloc(mmu_p->mmu_dvma_map, 178 MMU_PTOB(npages), MMU_PAGE_SIZE, 0, 179 counter_max, (void *)lo, (void *)(hi + 1), 180 dmareq->dmar_fp == DDI_DMA_SLEEP ? VM_SLEEP : VM_NOSLEEP)); 181 if (dvma_pg == 0) { 182 kmem_free(mp, sizeof (px_dma_hdl_t)); 183 return (DDI_DMA_NOMAPPING); 184 } 185 mmu_p->mmu_dvma_reserve -= npages; 186 187 /* 188 * Create the fast dvma request structure. 189 */ 190 fdvma_p = kmem_alloc(sizeof (fdvma_t), KM_SLEEP); 191 fdvma_p->pagecnt = kmem_alloc(npages * sizeof (uint_t), KM_SLEEP); 192 fdvma_p->ops = &fdvma_ops; 193 fdvma_p->softsp = (caddr_t)px_p; 194 fdvma_p->sync_flag = NULL; 195 196 /* 197 * Initialize the handle. 198 */ 199 mp->dmai_rdip = rdip; 200 mp->dmai_rflags = DMP_BYPASSNEXUS | DDI_DMA_READ | DMP_NOSYNC; 201 mp->dmai_burstsizes = dmareq->dmar_limits->dlim_burstsizes; 202 mp->dmai_mapping = MMU_PTOB(dvma_pg); 203 mp->dmai_ndvmapages = npages; 204 mp->dmai_size = npages * MMU_PAGE_SIZE; 205 mp->dmai_nwin = 0; 206 mp->dmai_fdvma = (caddr_t)fdvma_p; 207 208 /* 209 * For a given rdip, set mp->dmai_bdf with the bdf value of px's 210 * immediate child. As we move down the PCIe fabric, this field 211 * may be modified by switch and bridge drivers. 212 */ 213 mp->dmai_bdf = pcie_get_bdf_for_dma_xfer(dip, rdip); 214 215 DBG(DBG_DMA_CTL, dip, 216 "DDI_DMA_RESERVE: mp=%p dvma=%x npages=%x private=%p\n", 217 mp, mp->dmai_mapping, npages, fdvma_p); 218 *handlep = (ddi_dma_handle_t)mp; 219 return (DDI_SUCCESS); 220 } 221 222 int 223 px_fdvma_release(dev_info_t *dip, px_t *px_p, ddi_dma_impl_t *mp) 224 { 225 px_mmu_t *mmu_p = px_p->px_mmu_p; 226 size_t npages; 227 fdvma_t *fdvma_p = (fdvma_t *)mp->dmai_fdvma; 228 229 if (px_disable_fdvma) 230 return (DDI_FAILURE); 231 232 /* validate fdvma handle */ 233 if (!(mp->dmai_rflags & DMP_BYPASSNEXUS)) { 234 DBG(DBG_DMA_CTL, dip, "DDI_DMA_RELEASE: not fast dma\n"); 235 return (DDI_FAILURE); 236 } 237 238 /* flush all reserved dvma addresses from mmu */ 239 px_mmu_unmap_window(mmu_p, mp); 240 241 npages = mp->dmai_ndvmapages; 242 vmem_xfree(mmu_p->mmu_dvma_map, (void *)mp->dmai_mapping, 243 MMU_PTOB(npages)); 244 245 mmu_p->mmu_dvma_reserve += npages; 246 mp->dmai_ndvmapages = 0; 247 248 /* see if there is anyone waiting for dvma space */ 249 if (mmu_p->mmu_dvma_clid != 0) { 250 DBG(DBG_DMA_CTL, dip, "run dvma callback\n"); 251 ddi_run_callback(&mmu_p->mmu_dvma_clid); 252 } 253 254 /* free data structures */ 255 kmem_free(fdvma_p->pagecnt, npages * sizeof (uint_t)); 256 kmem_free(fdvma_p, sizeof (fdvma_t)); 257 kmem_free(mp, sizeof (px_dma_hdl_t)); 258 259 /* see if there is anyone waiting for kmem */ 260 if (px_kmem_clid != 0) { 261 DBG(DBG_DMA_CTL, dip, "run handle callback\n"); 262 ddi_run_callback(&px_kmem_clid); 263 } 264 return (DDI_SUCCESS); 265 } 266 267 static struct dvma_ops fdvma_ops = { 268 DVMAO_REV, 269 px_fdvma_load, 270 px_fdvma_unload, 271 px_fdvma_sync 272 }; 273