/* $NetBSD: bus_dma.c,v 1.147 2024/10/20 15:37:37 skrll Exp $ */ /*- * Copyright (c) 1996, 1997, 1998, 2020 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #define _ARM32_BUS_DMA_PRIVATE #include "opt_arm_bus_space.h" #include "opt_cputypes.h" #include __KERNEL_RCSID(0, "$NetBSD: bus_dma.c,v 1.147 2024/10/20 15:37:37 skrll Exp $"); #include #include #include #include #include #include #include #include #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS #include #endif #ifdef BUSDMA_COUNTERS static struct evcnt bus_dma_creates = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "creates"); static struct evcnt bus_dma_bounced_creates = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "bounced creates"); static struct evcnt bus_dma_loads = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "loads"); static struct evcnt bus_dma_bounced_loads = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "bounced loads"); static struct evcnt bus_dma_coherent_loads = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "coherent loads"); static struct evcnt bus_dma_read_bounces = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "read bounces"); static struct evcnt bus_dma_write_bounces = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "write bounces"); static struct evcnt bus_dma_bounced_unloads = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "bounced unloads"); static struct evcnt bus_dma_bounced_mbuf_loads = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "bounced mbuf loads"); static struct evcnt bus_dma_unloads = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "unloads"); static struct evcnt bus_dma_bounced_destroys = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "bounced destroys"); static struct evcnt bus_dma_destroys = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "destroys"); static struct evcnt bus_dma_sync_prereadwrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync prereadwrite"); static struct evcnt bus_dma_sync_preread_begin = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync preread begin"); static struct evcnt bus_dma_sync_preread = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync preread"); static struct evcnt bus_dma_sync_preread_tail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync preread tail"); static struct evcnt bus_dma_sync_prewrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync prewrite"); static struct evcnt bus_dma_sync_postread = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync postread"); static struct evcnt bus_dma_sync_postreadwrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync postreadwrite"); static struct evcnt bus_dma_sync_postwrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync postwrite"); static struct evcnt bus_dma_inrange_fail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "inrange check failed"); static struct evcnt bus_dma_sync_coherent_prereadwrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync coherent prereadwrite"); static struct evcnt bus_dma_sync_coherent_preread = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync coherent preread"); static struct evcnt bus_dma_sync_coherent_prewrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync coherent prewrite"); static struct evcnt bus_dma_sync_coherent_postread = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync coherent postread"); static struct evcnt bus_dma_sync_coherent_postreadwrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync coherent postreadwrite"); static struct evcnt bus_dma_sync_coherent_postwrite = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "busdma", "sync coherent postwrite"); EVCNT_ATTACH_STATIC(bus_dma_creates); EVCNT_ATTACH_STATIC(bus_dma_bounced_creates); EVCNT_ATTACH_STATIC(bus_dma_loads); EVCNT_ATTACH_STATIC(bus_dma_bounced_loads); EVCNT_ATTACH_STATIC(bus_dma_coherent_loads); EVCNT_ATTACH_STATIC(bus_dma_read_bounces); EVCNT_ATTACH_STATIC(bus_dma_write_bounces); EVCNT_ATTACH_STATIC(bus_dma_unloads); EVCNT_ATTACH_STATIC(bus_dma_bounced_unloads); EVCNT_ATTACH_STATIC(bus_dma_destroys); EVCNT_ATTACH_STATIC(bus_dma_bounced_destroys); EVCNT_ATTACH_STATIC(bus_dma_bounced_mbuf_loads); EVCNT_ATTACH_STATIC(bus_dma_sync_prereadwrite); EVCNT_ATTACH_STATIC(bus_dma_sync_preread_begin); EVCNT_ATTACH_STATIC(bus_dma_sync_preread); EVCNT_ATTACH_STATIC(bus_dma_sync_preread_tail); EVCNT_ATTACH_STATIC(bus_dma_sync_prewrite); EVCNT_ATTACH_STATIC(bus_dma_sync_postread); EVCNT_ATTACH_STATIC(bus_dma_sync_postreadwrite); EVCNT_ATTACH_STATIC(bus_dma_sync_postwrite); EVCNT_ATTACH_STATIC(bus_dma_inrange_fail); EVCNT_ATTACH_STATIC(bus_dma_sync_coherent_prereadwrite); EVCNT_ATTACH_STATIC(bus_dma_sync_coherent_preread); EVCNT_ATTACH_STATIC(bus_dma_sync_coherent_prewrite); EVCNT_ATTACH_STATIC(bus_dma_sync_coherent_postread); EVCNT_ATTACH_STATIC(bus_dma_sync_coherent_postreadwrite); EVCNT_ATTACH_STATIC(bus_dma_sync_coherent_postwrite); #define STAT_INCR(x) (bus_dma_ ## x.ev_count++) #else #define STAT_INCR(x) __nothing #endif int _bus_dmamap_load_buffer(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, struct vmspace *, int); /* * Check to see if the specified page is in an allowed DMA range. */ static inline struct arm32_dma_range * _bus_dma_paddr_inrange(struct arm32_dma_range *ranges, int nranges, bus_addr_t curaddr) { struct arm32_dma_range *dr; int i; for (i = 0, dr = ranges; i < nranges; i++, dr++) { if (curaddr >= dr->dr_sysbase && curaddr < (dr->dr_sysbase + dr->dr_len)) return dr; } return NULL; } /* * Check to see if the specified busaddr is in an allowed DMA range. */ static inline paddr_t _bus_dma_busaddr_to_paddr(bus_dma_tag_t t, bus_addr_t curaddr) { struct arm32_dma_range *dr; u_int i; if (t->_nranges == 0) return curaddr; for (i = 0, dr = t->_ranges; i < t->_nranges; i++, dr++) { if (dr->dr_busbase <= curaddr && curaddr < dr->dr_busbase + dr->dr_len) return curaddr - dr->dr_busbase + dr->dr_sysbase; } panic("%s: curaddr %#" PRIxBUSADDR "not in range", __func__, curaddr); } /* * Common function to load the specified physical address into the * DMA map, coalescing segments and boundary checking as necessary. */ static int _bus_dmamap_load_paddr(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t paddr, bus_size_t size, bool coherent) { bus_dma_segment_t * const segs = map->dm_segs; int nseg = map->dm_nsegs; bus_addr_t lastaddr; bus_addr_t bmask = ~(map->_dm_boundary - 1); bus_addr_t curaddr; bus_size_t sgsize; uint32_t _ds_flags = coherent ? _BUS_DMAMAP_COHERENT : 0; if (nseg > 0) lastaddr = segs[nseg - 1].ds_addr + segs[nseg - 1].ds_len; else lastaddr = 0xdead; again: sgsize = size; /* Make sure we're in an allowed DMA range. */ if (t->_ranges != NULL) { /* XXX cache last result? */ const struct arm32_dma_range * const dr = _bus_dma_paddr_inrange(t->_ranges, t->_nranges, paddr); if (dr == NULL) { STAT_INCR(inrange_fail); return EINVAL; } /* * If this region is coherent, mark the segment as coherent. */ _ds_flags |= dr->dr_flags & _BUS_DMAMAP_COHERENT; /* * In a valid DMA range. Translate the physical * memory address to an address in the DMA window. */ curaddr = (paddr - dr->dr_sysbase) + dr->dr_busbase; #if 0 printf("%p: %#" PRIxPADDR ": range %#" PRIxPADDR "/%#" PRIxBUSADDR "/%#" PRIxBUSSIZE "/%#" PRIx32 ": %#" PRIx32 " <-- %#" PRIxBUSADDR "\n", t, paddr, dr->dr_sysbase, dr->dr_busbase, dr->dr_len, dr->dr_flags, _ds_flags, curaddr); #endif } else curaddr = paddr; /* * Make sure we don't cross any boundaries. */ if (map->_dm_boundary > 0) { bus_addr_t baddr; /* next boundary address */ baddr = (curaddr + map->_dm_boundary) & bmask; if (sgsize > (baddr - curaddr)) sgsize = (baddr - curaddr); } /* * Insert chunk into a segment, coalescing with the * previous segment if possible. */ if (nseg > 0 && curaddr == lastaddr && segs[nseg - 1].ds_len + sgsize <= map->dm_maxsegsz && ((segs[nseg - 1]._ds_flags ^ _ds_flags) & _BUS_DMAMAP_COHERENT) == 0 && (map->_dm_boundary == 0 || (segs[nseg - 1].ds_addr & bmask) == (curaddr & bmask))) { /* coalesce */ segs[nseg - 1].ds_len += sgsize; } else if (nseg >= map->_dm_segcnt) { return EFBIG; } else { /* new segment */ segs[nseg].ds_addr = curaddr; segs[nseg].ds_len = sgsize; segs[nseg]._ds_paddr = curaddr; segs[nseg]._ds_flags = _ds_flags; nseg++; } lastaddr = curaddr + sgsize; paddr += sgsize; size -= sgsize; if (size > 0) goto again; map->_dm_flags &= (_ds_flags & _BUS_DMAMAP_COHERENT); map->dm_nsegs = nseg; return 0; } static int _bus_dma_uiomove(void *buf, struct uio *uio, size_t n, int direction); #ifdef _ARM32_NEED_BUS_DMA_BOUNCE static int _bus_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, int flags); static void _bus_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map); static int _bus_dma_load_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, void *buf, size_t buflen, int buftype, int flags) { struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie; struct vmspace * const vm = vmspace_kernel(); int error; KASSERT(cookie != NULL); KASSERT(cookie->id_flags & _BUS_DMA_MIGHT_NEED_BOUNCE); /* * Allocate bounce pages, if necessary. */ if ((cookie->id_flags & _BUS_DMA_HAS_BOUNCE) == 0) { error = _bus_dma_alloc_bouncebuf(t, map, buflen, flags); if (error) return error; } /* * Since we're trying again, clear the previous attempt. */ map->dm_mapsize = 0; map->dm_nsegs = 0; map->_dm_buftype = _BUS_DMA_BUFTYPE_INVALID; /* _bus_dmamap_load_buffer() clears this if we're not... */ map->_dm_flags |= _BUS_DMAMAP_COHERENT; /* * Cache a pointer to the caller's buffer and load the DMA map * with the bounce buffer. */ cookie->id_origbuf = buf; cookie->id_origbuflen = buflen; error = _bus_dmamap_load_buffer(t, map, cookie->id_bouncebuf, buflen, vm, flags); if (error) return error; STAT_INCR(bounced_loads); map->dm_mapsize = buflen; map->_dm_vmspace = vm; map->_dm_buftype = buftype; /* ...so _bus_dmamap_sync() knows we're bouncing */ map->_dm_flags |= _BUS_DMAMAP_IS_BOUNCING; cookie->id_flags |= _BUS_DMA_IS_BOUNCING; return 0; } #endif /* _ARM32_NEED_BUS_DMA_BOUNCE */ /* * Common function for DMA map creation. May be called by bus-specific * DMA map creation functions. */ int _bus_dmamap_create(bus_dma_tag_t t, bus_size_t size, int nsegments, bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamp) { struct arm32_bus_dmamap *map; void *mapstore; int error = 0; #ifdef DEBUG_DMA printf("dmamap_create: t=%p size=%#" PRIxBUSSIZE " nseg=%#x msegsz=%#" PRIxBUSSIZE " boundary=%#" PRIxBUSSIZE " flags=%#x\n", t, size, nsegments, maxsegsz, boundary, flags); #endif /* DEBUG_DMA */ /* * Allocate and initialize the DMA map. The end of the map * is a variable-sized array of segments, so we allocate enough * room for them in one shot. * * Note we don't preserve the WAITOK or NOWAIT flags. Preservation * of ALLOCNOW notifies others that we've reserved these resources, * and they are not to be freed. * * The bus_dmamap_t includes one bus_dma_segment_t, hence * the (nsegments - 1). */ const size_t mapsize = sizeof(struct arm32_bus_dmamap) + (sizeof(bus_dma_segment_t) * (nsegments - 1)); const int zallocflags = (flags & BUS_DMA_NOWAIT) ? KM_NOSLEEP : KM_SLEEP; if ((mapstore = kmem_intr_zalloc(mapsize, zallocflags)) == NULL) return ENOMEM; map = (struct arm32_bus_dmamap *)mapstore; map->_dm_size = size; map->_dm_segcnt = nsegments; map->_dm_maxmaxsegsz = maxsegsz; map->_dm_boundary = boundary; map->_dm_flags = flags & ~(BUS_DMA_WAITOK | BUS_DMA_NOWAIT); map->_dm_origbuf = NULL; map->_dm_buftype = _BUS_DMA_BUFTYPE_INVALID; map->_dm_vmspace = vmspace_kernel(); map->_dm_cookie = NULL; map->dm_maxsegsz = maxsegsz; map->dm_mapsize = 0; /* no valid mappings */ map->dm_nsegs = 0; #ifdef _ARM32_NEED_BUS_DMA_BOUNCE struct arm32_bus_dma_cookie *cookie; int cookieflags; void *cookiestore; cookieflags = 0; if (t->_may_bounce != NULL) { error = (*t->_may_bounce)(t, map, flags, &cookieflags); if (error != 0) goto out; } if (t->_ranges != NULL) { /* * If ranges are defined, we may have to bounce. The only * exception is if there is exactly one range that covers * all of physical memory. */ switch (t->_nranges) { case 1: if (t->_ranges[0].dr_sysbase == 0 && t->_ranges[0].dr_len == UINTPTR_MAX) { break; } /* FALLTHROUGH */ default: cookieflags |= _BUS_DMA_MIGHT_NEED_BOUNCE; } } if ((cookieflags & _BUS_DMA_MIGHT_NEED_BOUNCE) == 0) { STAT_INCR(creates); *dmamp = map; return 0; } const size_t cookiesize = sizeof(struct arm32_bus_dma_cookie) + (sizeof(bus_dma_segment_t) * map->_dm_segcnt); /* * Allocate our cookie. */ if ((cookiestore = kmem_intr_zalloc(cookiesize, zallocflags)) == NULL) { error = ENOMEM; goto out; } cookie = (struct arm32_bus_dma_cookie *)cookiestore; cookie->id_flags = cookieflags; map->_dm_cookie = cookie; STAT_INCR(bounced_creates); error = _bus_dma_alloc_bouncebuf(t, map, size, flags); out: if (error) _bus_dmamap_destroy(t, map); else *dmamp = map; #else *dmamp = map; STAT_INCR(creates); #endif /* _ARM32_NEED_BUS_DMA_BOUNCE */ #ifdef DEBUG_DMA printf("dmamap_create:map=%p\n", map); #endif /* DEBUG_DMA */ return error; } /* * Common function for DMA map destruction. May be called by bus-specific * DMA map destruction functions. */ void _bus_dmamap_destroy(bus_dma_tag_t t, bus_dmamap_t map) { #ifdef DEBUG_DMA printf("dmamap_destroy: t=%p map=%p\n", t, map); #endif /* DEBUG_DMA */ #ifdef _ARM32_NEED_BUS_DMA_BOUNCE struct arm32_bus_dma_cookie *cookie = map->_dm_cookie; /* * Free any bounce pages this map might hold. */ if (cookie != NULL) { const size_t cookiesize = sizeof(struct arm32_bus_dma_cookie) + (sizeof(bus_dma_segment_t) * map->_dm_segcnt); if (cookie->id_flags & _BUS_DMA_IS_BOUNCING) STAT_INCR(bounced_unloads); map->dm_nsegs = 0; if (cookie->id_flags & _BUS_DMA_HAS_BOUNCE) _bus_dma_free_bouncebuf(t, map); STAT_INCR(bounced_destroys); kmem_intr_free(cookie, cookiesize); } else #endif STAT_INCR(destroys); if (map->dm_nsegs > 0) STAT_INCR(unloads); const size_t mapsize = sizeof(struct arm32_bus_dmamap) + (sizeof(bus_dma_segment_t) * (map->_dm_segcnt - 1)); kmem_intr_free(map, mapsize); } /* * Common function for loading a DMA map with a linear buffer. May * be called by bus-specific DMA map load functions. */ int _bus_dmamap_load(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) { struct vmspace *vm; int error; #ifdef DEBUG_DMA printf("dmamap_load: t=%p map=%p buf=%p len=%#" PRIxBUSSIZE " p=%p f=%#x\n", t, map, buf, buflen, p, flags); #endif /* DEBUG_DMA */ if (map->dm_nsegs > 0) { #ifdef _ARM32_NEED_BUS_DMA_BOUNCE struct arm32_bus_dma_cookie *cookie = map->_dm_cookie; if (cookie != NULL) { if (cookie->id_flags & _BUS_DMA_IS_BOUNCING) { STAT_INCR(bounced_unloads); cookie->id_flags &= ~_BUS_DMA_IS_BOUNCING; map->_dm_flags &= ~_BUS_DMAMAP_IS_BOUNCING; } } else #endif STAT_INCR(unloads); } /* * Make sure that on error condition we return "no valid mappings". */ map->dm_mapsize = 0; map->dm_nsegs = 0; map->_dm_buftype = _BUS_DMA_BUFTYPE_INVALID; KASSERTMSG(map->dm_maxsegsz <= map->_dm_maxmaxsegsz, "dm_maxsegsz %" PRIuBUSSIZE " _dm_maxmaxsegsz %" PRIuBUSSIZE, map->dm_maxsegsz, map->_dm_maxmaxsegsz); if (buflen > map->_dm_size) return EINVAL; if (p != NULL) { vm = p->p_vmspace; } else { vm = vmspace_kernel(); } /* _bus_dmamap_load_buffer() clears this if we're not... */ map->_dm_flags |= _BUS_DMAMAP_COHERENT; error = _bus_dmamap_load_buffer(t, map, buf, buflen, vm, flags); if (error == 0) { map->dm_mapsize = buflen; map->_dm_vmspace = vm; map->_dm_origbuf = buf; map->_dm_buftype = _BUS_DMA_BUFTYPE_LINEAR; if (map->_dm_flags & _BUS_DMAMAP_COHERENT) { STAT_INCR(coherent_loads); } else { STAT_INCR(loads); } return 0; } #ifdef _ARM32_NEED_BUS_DMA_BOUNCE struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie; if (cookie != NULL && (cookie->id_flags & _BUS_DMA_MIGHT_NEED_BOUNCE)) { error = _bus_dma_load_bouncebuf(t, map, buf, buflen, _BUS_DMA_BUFTYPE_LINEAR, flags); } #endif return error; } /* * Like _bus_dmamap_load(), but for mbufs. */ int _bus_dmamap_load_mbuf(bus_dma_tag_t t, bus_dmamap_t map, struct mbuf *m0, int flags) { struct mbuf *m; int error; #ifdef DEBUG_DMA printf("dmamap_load_mbuf: t=%p map=%p m0=%p f=%#x\n", t, map, m0, flags); #endif /* DEBUG_DMA */ if (map->dm_nsegs > 0) { #ifdef _ARM32_NEED_BUS_DMA_BOUNCE struct arm32_bus_dma_cookie *cookie = map->_dm_cookie; if (cookie != NULL) { if (cookie->id_flags & _BUS_DMA_IS_BOUNCING) { STAT_INCR(bounced_unloads); cookie->id_flags &= ~_BUS_DMA_IS_BOUNCING; map->_dm_flags &= ~_BUS_DMAMAP_IS_BOUNCING; } } else #endif STAT_INCR(unloads); } /* * Make sure that on error condition we return "no valid mappings." */ map->dm_mapsize = 0; map->dm_nsegs = 0; map->_dm_buftype = _BUS_DMA_BUFTYPE_INVALID; KASSERTMSG(map->dm_maxsegsz <= map->_dm_maxmaxsegsz, "dm_maxsegsz %" PRIuBUSSIZE " _dm_maxmaxsegsz %" PRIuBUSSIZE, map->dm_maxsegsz, map->_dm_maxmaxsegsz); KASSERT(m0->m_flags & M_PKTHDR); if (m0->m_pkthdr.len > map->_dm_size) return EINVAL; /* _bus_dmamap_load_paddr() clears this if we're not... */ map->_dm_flags |= _BUS_DMAMAP_COHERENT; error = 0; for (m = m0; m != NULL && error == 0; m = m->m_next) { int offset; int remainbytes; const struct vm_page * const *pgs; paddr_t paddr; int size; if (m->m_len == 0) continue; /* * Don't allow reads in read-only mbufs. */ if (M_ROMAP(m) && (flags & BUS_DMA_READ)) { error = EFAULT; break; } switch (m->m_flags & (M_EXT | M_EXT_CLUSTER | M_EXT_PAGES)) { case M_EXT | M_EXT_CLUSTER: KASSERT(m->m_ext.ext_paddr != M_PADDR_INVALID); paddr = m->m_ext.ext_paddr + (m->m_data - m->m_ext.ext_buf); size = m->m_len; error = _bus_dmamap_load_paddr(t, map, paddr, size, false); break; case M_EXT | M_EXT_PAGES: KASSERT(m->m_ext.ext_buf <= m->m_data); KASSERT(m->m_data <= m->m_ext.ext_buf + m->m_ext.ext_size); offset = (vaddr_t)m->m_data - trunc_page((vaddr_t)m->m_ext.ext_buf); remainbytes = m->m_len; /* skip uninteresting pages */ pgs = (const struct vm_page * const *) m->m_ext.ext_pgs + (offset >> PAGE_SHIFT); offset &= PAGE_MASK; /* offset in the first page */ /* load each page */ while (remainbytes > 0) { const struct vm_page *pg; size = MIN(remainbytes, PAGE_SIZE - offset); pg = *pgs++; KASSERT(pg); paddr = VM_PAGE_TO_PHYS(pg) + offset; error = _bus_dmamap_load_paddr(t, map, paddr, size, false); if (error) break; offset = 0; remainbytes -= size; } break; case 0: paddr = m->m_paddr + M_BUFOFFSET(m) + (m->m_data - M_BUFADDR(m)); size = m->m_len; error = _bus_dmamap_load_paddr(t, map, paddr, size, false); break; default: error = _bus_dmamap_load_buffer(t, map, m->m_data, m->m_len, vmspace_kernel(), flags); } } if (error == 0) { map->dm_mapsize = m0->m_pkthdr.len; map->_dm_origbuf = m0; map->_dm_buftype = _BUS_DMA_BUFTYPE_MBUF; map->_dm_vmspace = vmspace_kernel(); /* always kernel */ if (map->_dm_flags & _BUS_DMAMAP_COHERENT) { STAT_INCR(coherent_loads); } else { STAT_INCR(loads); } return 0; } #ifdef _ARM32_NEED_BUS_DMA_BOUNCE struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie; if (cookie != NULL && (cookie->id_flags & _BUS_DMA_MIGHT_NEED_BOUNCE)) { error = _bus_dma_load_bouncebuf(t, map, m0, m0->m_pkthdr.len, _BUS_DMA_BUFTYPE_MBUF, flags); STAT_INCR(bounced_mbuf_loads); } #endif return error; } /* * Like _bus_dmamap_load(), but for uios. */ int _bus_dmamap_load_uio(bus_dma_tag_t t, bus_dmamap_t map, struct uio *uio, int flags) { bus_size_t minlen, resid; struct iovec *iov; void *addr; int i, error; /* * Make sure that on error condition we return "no valid mappings." */ map->dm_mapsize = 0; map->dm_nsegs = 0; KASSERTMSG(map->dm_maxsegsz <= map->_dm_maxmaxsegsz, "dm_maxsegsz %" PRIuBUSSIZE " _dm_maxmaxsegsz %" PRIuBUSSIZE, map->dm_maxsegsz, map->_dm_maxmaxsegsz); resid = uio->uio_resid; iov = uio->uio_iov; /* _bus_dmamap_load_buffer() clears this if we're not... */ map->_dm_flags |= _BUS_DMAMAP_COHERENT; error = 0; for (i = 0; i < uio->uio_iovcnt && resid != 0 && error == 0; i++) { /* * Now at the first iovec to load. Load each iovec * until we have exhausted the residual count. */ minlen = resid < iov[i].iov_len ? resid : iov[i].iov_len; addr = (void *)iov[i].iov_base; error = _bus_dmamap_load_buffer(t, map, addr, minlen, uio->uio_vmspace, flags); resid -= minlen; } if (error == 0) { map->dm_mapsize = uio->uio_resid; map->_dm_origbuf = uio; map->_dm_buftype = _BUS_DMA_BUFTYPE_UIO; map->_dm_vmspace = uio->uio_vmspace; if (map->_dm_flags & _BUS_DMAMAP_COHERENT) { STAT_INCR(coherent_loads); } else { STAT_INCR(loads); } } return error; } /* * Like _bus_dmamap_load(), but for raw memory allocated with * bus_dmamem_alloc(). */ int _bus_dmamap_load_raw(bus_dma_tag_t t, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size0, int flags) { bus_size_t size; int i, error = 0; /* * Make sure that on error conditions we return "no valid mappings." */ map->dm_mapsize = 0; map->dm_nsegs = 0; KASSERT(map->dm_maxsegsz <= map->_dm_maxmaxsegsz); if (size0 > map->_dm_size) return EINVAL; for (i = 0, size = size0; i < nsegs && size > 0; i++) { bus_dma_segment_t *ds = &segs[i]; bus_size_t sgsize; sgsize = MIN(ds->ds_len, size); if (sgsize == 0) continue; const bool coherent = (ds->_ds_flags & _BUS_DMAMAP_COHERENT) != 0; error = _bus_dmamap_load_paddr(t, map, ds->ds_addr, sgsize, coherent); if (error != 0) break; size -= sgsize; } if (error != 0) { map->dm_mapsize = 0; map->dm_nsegs = 0; return error; } /* XXX TBD bounce */ map->dm_mapsize = size0; map->_dm_origbuf = NULL; map->_dm_buftype = _BUS_DMA_BUFTYPE_RAW; map->_dm_vmspace = NULL; return 0; } /* * Common function for unloading a DMA map. May be called by * bus-specific DMA map unload functions. */ void _bus_dmamap_unload(bus_dma_tag_t t, bus_dmamap_t map) { #ifdef DEBUG_DMA printf("dmamap_unload: t=%p map=%p\n", t, map); #endif /* DEBUG_DMA */ /* * No resources to free; just mark the mappings as * invalid. */ map->dm_mapsize = 0; map->dm_nsegs = 0; map->_dm_origbuf = NULL; map->_dm_buftype = _BUS_DMA_BUFTYPE_INVALID; map->_dm_vmspace = NULL; } static void _bus_dmamap_sync_segment(vaddr_t va, paddr_t pa, vsize_t len, int ops, bool readonly_p) { #if defined(ARM_MMU_EXTENDED) /* * No optimisations are available for readonly mbufs on armv6+, so * assume it's not readonly from here on. * * See the comment in _bus_dmamap_sync_mbuf */ readonly_p = false; #endif KASSERTMSG((va & PAGE_MASK) == (pa & PAGE_MASK), "va %#" PRIxVADDR " pa %#" PRIxPADDR, va, pa); #if 0 printf("sync_segment: va=%#" PRIxVADDR " pa=%#" PRIxPADDR " len=%#" PRIxVSIZE " ops=%#x\n", va, pa, len, ops); #endif switch (ops) { case BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE: if (!readonly_p) { STAT_INCR(sync_prereadwrite); cpu_dcache_wbinv_range(va, len); cpu_sdcache_wbinv_range(va, pa, len); break; } /* FALLTHROUGH */ case BUS_DMASYNC_PREREAD: { const size_t line_size = arm_dcache_align; const size_t line_mask = arm_dcache_align_mask; vsize_t misalignment = va & line_mask; if (misalignment) { va -= misalignment; pa -= misalignment; len += misalignment; STAT_INCR(sync_preread_begin); cpu_dcache_wbinv_range(va, line_size); cpu_sdcache_wbinv_range(va, pa, line_size); if (len <= line_size) break; va += line_size; pa += line_size; len -= line_size; } misalignment = len & line_mask; len -= misalignment; if (len > 0) { STAT_INCR(sync_preread); cpu_dcache_inv_range(va, len); cpu_sdcache_inv_range(va, pa, len); } if (misalignment) { va += len; pa += len; STAT_INCR(sync_preread_tail); cpu_dcache_wbinv_range(va, line_size); cpu_sdcache_wbinv_range(va, pa, line_size); } break; } case BUS_DMASYNC_PREWRITE: STAT_INCR(sync_prewrite); cpu_dcache_wb_range(va, len); cpu_sdcache_wb_range(va, pa, len); break; #if defined(CPU_CORTEX) || defined(CPU_ARMV8) /* * Cortex CPUs can do speculative loads so we need to clean the cache * after a DMA read to deal with any speculatively loaded cache lines. * Since these can't be dirty, we can just invalidate them and don't * have to worry about having to write back their contents. */ case BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE: STAT_INCR(sync_postreadwrite); cpu_dcache_inv_range(va, len); cpu_sdcache_inv_range(va, pa, len); break; case BUS_DMASYNC_POSTREAD: STAT_INCR(sync_postread); cpu_dcache_inv_range(va, len); cpu_sdcache_inv_range(va, pa, len); break; #endif } } static inline void _bus_dmamap_sync_linear(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops) { bus_dma_segment_t *ds = map->dm_segs; vaddr_t va = (vaddr_t) map->_dm_origbuf; #ifdef _ARM32_NEED_BUS_DMA_BOUNCE if (map->_dm_flags & _BUS_DMAMAP_IS_BOUNCING) { struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie; va = (vaddr_t) cookie->id_bouncebuf; } #endif while (len > 0) { while (offset >= ds->ds_len) { offset -= ds->ds_len; va += ds->ds_len; ds++; } paddr_t pa = _bus_dma_busaddr_to_paddr(t, ds->ds_addr + offset); size_t seglen = uimin(len, ds->ds_len - offset); if ((ds->_ds_flags & _BUS_DMAMAP_COHERENT) == 0) _bus_dmamap_sync_segment(va + offset, pa, seglen, ops, false); offset += seglen; len -= seglen; } } static inline void _bus_dmamap_sync_mbuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t offset, bus_size_t len, int ops) { bus_dma_segment_t *ds = map->dm_segs; struct mbuf *m = map->_dm_origbuf; bus_size_t voff = offset; bus_size_t ds_off = offset; while (len > 0) { /* Find the current dma segment */ while (ds_off >= ds->ds_len) { ds_off -= ds->ds_len; ds++; } /* Find the current mbuf. */ while (voff >= m->m_len) { voff -= m->m_len; m = m->m_next; } /* * Now at the first mbuf to sync; nail each one until * we have exhausted the length. */ vsize_t seglen = uimin(len, uimin(m->m_len - voff, ds->ds_len - ds_off)); vaddr_t va = mtod(m, vaddr_t) + voff; paddr_t pa = _bus_dma_busaddr_to_paddr(t, ds->ds_addr + ds_off); /* * We can save a lot of work here if we know the mapping * is read-only at the MMU and we aren't using the armv6+ * MMU: * * If a mapping is read-only, no dirty cache blocks will * exist for it. If a writable mapping was made read-only, * we know any dirty cache lines for the range will have * been cleaned for us already. Therefore, if the upper * layer can tell us we have a read-only mapping, we can * skip all cache cleaning. * * NOTE: This only works if we know the pmap cleans pages * before making a read-write -> read-only transition. If * this ever becomes non-true (e.g. Physically Indexed * cache), this will have to be revisited. */ if ((ds->_ds_flags & _BUS_DMAMAP_COHERENT) == 0) { /* * If we are doing preread (DMAing into the mbuf), * this mbuf better not be readonly, */ KASSERT(!(ops & BUS_DMASYNC_PREREAD) || !M_ROMAP(m)); _bus_dmamap_sync_segment(va, pa, seglen, ops, M_ROMAP(m)); } voff += seglen; ds_off += seglen; len -= seglen; } } static inline void _bus_dmamap_sync_uio(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops) { bus_dma_segment_t *ds = map->dm_segs; struct uio *uio = map->_dm_origbuf; struct iovec *iov = uio->uio_iov; bus_size_t voff = offset; bus_size_t ds_off = offset; while (len > 0) { /* Find the current dma segment */ while (ds_off >= ds->ds_len) { ds_off -= ds->ds_len; ds++; } /* Find the current iovec. */ while (voff >= iov->iov_len) { voff -= iov->iov_len; iov++; } /* * Now at the first iovec to sync; nail each one until * we have exhausted the length. */ vsize_t seglen = uimin(len, uimin(iov->iov_len - voff, ds->ds_len - ds_off)); vaddr_t va = (vaddr_t) iov->iov_base + voff; paddr_t pa = _bus_dma_busaddr_to_paddr(t, ds->ds_addr + ds_off); if ((ds->_ds_flags & _BUS_DMAMAP_COHERENT) == 0) _bus_dmamap_sync_segment(va, pa, seglen, ops, false); voff += seglen; ds_off += seglen; len -= seglen; } } /* * Common function for DMA map synchronization. May be called * by bus-specific DMA map synchronization functions. * * XXX Should have separate versions for write-through vs. * XXX write-back caches. We currently assume write-back * XXX here, which is not as efficient as it could be for * XXX the write-through case. */ void _bus_dmamap_sync(bus_dma_tag_t t, bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops) { #ifdef DEBUG_DMA printf("dmamap_sync: t=%p map=%p offset=%#" PRIxBUSADDR " len=%#" PRIxBUSSIZE " ops=%#x\n", t, map, offset, len, ops); #endif /* DEBUG_DMA */ /* * Mixing of PRE and POST operations is not allowed. */ if ((ops & (BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE)) != 0 && (ops & (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE)) != 0) panic("%s: mix PRE and POST", __func__); KASSERTMSG(offset < map->dm_mapsize, "offset %" PRIxBUSADDR " mapsize %" PRIuBUSSIZE, offset, map->dm_mapsize); KASSERTMSG(len > 0 && offset + len <= map->dm_mapsize, "len %" PRIuBUSSIZE " offset %" PRIxBUSADDR " mapsize %" PRIuBUSSIZE, len, offset, map->dm_mapsize); /* * For a write-back cache, we need to do the following things: * * PREREAD -- Invalidate the D-cache. We do this * here in case a write-back is required by the back-end. * * PREWRITE -- Write-back the D-cache. Note that if * we are doing a PREREAD | PREWRITE, we can collapse * the whole thing into a single Wb-Inv. * * POSTREAD -- Re-invalidate the D-cache in case speculative * memory accesses caused cachelines to become valid with now * invalid data. * * POSTWRITE -- Nothing. */ #ifdef _ARM32_NEED_BUS_DMA_BOUNCE const bool bouncing = (map->_dm_flags & _BUS_DMAMAP_IS_BOUNCING); #else const bool bouncing = false; #endif const int pre_ops = ops & (BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE); #if defined(CPU_CORTEX) || defined(CPU_ARMV8) const int post_ops = ops & (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE); #else const int post_ops = 0; #endif if (pre_ops == 0 && post_ops == 0) return; if (post_ops == BUS_DMASYNC_POSTWRITE) { KASSERT(pre_ops == 0); if ((map->_dm_flags & _BUS_DMAMAP_COHERENT)) { STAT_INCR(sync_coherent_postwrite); } else { STAT_INCR(sync_postwrite); } return; } KASSERTMSG(bouncing || pre_ops != 0 || (post_ops & BUS_DMASYNC_POSTREAD), "pre_ops %#x post_ops %#x", pre_ops, post_ops); if (bouncing && (ops & BUS_DMASYNC_PREWRITE)) { struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie; STAT_INCR(write_bounces); char * const dataptr = (char *)cookie->id_bouncebuf + offset; /* * Copy the caller's buffer to the bounce buffer. */ switch (map->_dm_buftype) { case _BUS_DMA_BUFTYPE_LINEAR: memcpy(dataptr, cookie->id_origlinearbuf + offset, len); break; case _BUS_DMA_BUFTYPE_MBUF: m_copydata(cookie->id_origmbuf, offset, len, dataptr); break; case _BUS_DMA_BUFTYPE_UIO: _bus_dma_uiomove(dataptr, cookie->id_origuio, len, UIO_WRITE); break; #ifdef DIAGNOSTIC case _BUS_DMA_BUFTYPE_RAW: panic("%s:(pre): _BUS_DMA_BUFTYPE_RAW", __func__); break; case _BUS_DMA_BUFTYPE_INVALID: panic("%s(pre): _BUS_DMA_BUFTYPE_INVALID", __func__); break; default: panic("%s(pre): map %p: unknown buffer type %d\n", __func__, map, map->_dm_buftype); break; #endif /* DIAGNOSTIC */ } } /* Skip cache frobbing if mapping was COHERENT */ if ((map->_dm_flags & _BUS_DMAMAP_COHERENT)) { switch (ops) { case BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE: STAT_INCR(sync_coherent_prereadwrite); break; case BUS_DMASYNC_PREREAD: STAT_INCR(sync_coherent_preread); break; case BUS_DMASYNC_PREWRITE: STAT_INCR(sync_coherent_prewrite); break; case BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE: STAT_INCR(sync_coherent_postreadwrite); break; case BUS_DMASYNC_POSTREAD: STAT_INCR(sync_coherent_postread); break; /* BUS_DMASYNC_POSTWRITE was aleady handled as a fastpath */ } /* * Drain the write buffer of DMA operators. * 1) when cpu->device (prewrite) * 2) when device->cpu (postread) */ if ((pre_ops & BUS_DMASYNC_PREWRITE) || (post_ops & BUS_DMASYNC_POSTREAD)) cpu_drain_writebuf(); /* * Only thing left to do for COHERENT mapping is copy from bounce * in the POSTREAD case. */ if (bouncing && (post_ops & BUS_DMASYNC_POSTREAD)) goto bounce_it; return; } #if !defined(ARM_MMU_EXTENDED) /* * If the mapping belongs to a non-kernel vmspace, and the * vmspace has not been active since the last time a full * cache flush was performed, we don't need to do anything. */ if (__predict_false(!VMSPACE_IS_KERNEL_P(map->_dm_vmspace) && vm_map_pmap(&map->_dm_vmspace->vm_map)->pm_cstate.cs_cache_d == 0)) return; #endif int buftype = map->_dm_buftype; if (bouncing) { buftype = _BUS_DMA_BUFTYPE_LINEAR; } switch (buftype) { case _BUS_DMA_BUFTYPE_LINEAR: case _BUS_DMA_BUFTYPE_RAW: _bus_dmamap_sync_linear(t, map, offset, len, ops); break; case _BUS_DMA_BUFTYPE_MBUF: _bus_dmamap_sync_mbuf(t, map, offset, len, ops); break; case _BUS_DMA_BUFTYPE_UIO: _bus_dmamap_sync_uio(t, map, offset, len, ops); break; case _BUS_DMA_BUFTYPE_INVALID: panic("%s: _BUS_DMA_BUFTYPE_INVALID", __func__); break; default: panic("%s: map %p: unknown buffer type %d\n", __func__, map, map->_dm_buftype); } /* Drain the write buffer. */ cpu_drain_writebuf(); if (!bouncing || (ops & BUS_DMASYNC_POSTREAD) == 0) return; bounce_it: STAT_INCR(read_bounces); struct arm32_bus_dma_cookie * const cookie = map->_dm_cookie; char * const dataptr = (char *)cookie->id_bouncebuf + offset; /* * Copy the bounce buffer to the caller's buffer. */ switch (map->_dm_buftype) { case _BUS_DMA_BUFTYPE_LINEAR: memcpy(cookie->id_origlinearbuf + offset, dataptr, len); break; case _BUS_DMA_BUFTYPE_MBUF: m_copyback(cookie->id_origmbuf, offset, len, dataptr); break; case _BUS_DMA_BUFTYPE_UIO: _bus_dma_uiomove(dataptr, cookie->id_origuio, len, UIO_READ); break; #ifdef DIAGNOSTIC case _BUS_DMA_BUFTYPE_RAW: panic("%s(post): _BUS_DMA_BUFTYPE_RAW", __func__); break; case _BUS_DMA_BUFTYPE_INVALID: panic("%s(post): _BUS_DMA_BUFTYPE_INVALID", __func__); break; default: panic("%s(post): map %p: unknown buffer type %d\n", __func__, map, map->_dm_buftype); break; #endif } } /* * Common function for DMA-safe memory allocation. May be called * by bus-specific DMA memory allocation functions. */ int _bus_dmamem_alloc(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags) { struct arm32_dma_range *dr; int error, i; #ifdef DEBUG_DMA printf("dmamem_alloc t=%p size=%#" PRIxBUSSIZE " align=%#" PRIxBUSSIZE " boundary=%#" PRIxBUSSIZE " " "segs=%p nsegs=%#x rsegs=%p flags=%#x\n", t, size, alignment, boundary, segs, nsegs, rsegs, flags); #endif if ((dr = t->_ranges) != NULL) { error = ENOMEM; for (i = 0; i < t->_nranges; i++, dr++) { if (dr->dr_len == 0 || (dr->dr_flags & _BUS_DMAMAP_NOALLOC)) continue; error = _bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs, flags, trunc_page(dr->dr_sysbase), trunc_page(dr->dr_sysbase + dr->dr_len)); if (error == 0) break; } } else { error = _bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs, flags, 0UL, ~0UL); } #ifdef DEBUG_DMA printf("dmamem_alloc: =%d\n", error); #endif return error; } /* * Common function for freeing DMA-safe memory. May be called by * bus-specific DMA memory free functions. */ void _bus_dmamem_free(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs) { struct vm_page *m; bus_addr_t addr; struct pglist mlist; int curseg; #ifdef DEBUG_DMA printf("dmamem_free: t=%p segs=%p nsegs=%#x\n", t, segs, nsegs); #endif /* DEBUG_DMA */ /* * Build a list of pages to free back to the VM system. */ TAILQ_INIT(&mlist); for (curseg = 0; curseg < nsegs; curseg++) { for (addr = segs[curseg].ds_addr; addr < (segs[curseg].ds_addr + segs[curseg].ds_len); addr += PAGE_SIZE) { m = PHYS_TO_VM_PAGE(addr); TAILQ_INSERT_TAIL(&mlist, m, pageq.queue); } } uvm_pglistfree(&mlist); } /* * Common function for mapping DMA-safe memory. May be called by * bus-specific DMA memory map functions. */ int _bus_dmamem_map(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs, size_t size, void **kvap, int flags) { vaddr_t va; paddr_t pa; int curseg; const uvm_flag_t kmflags = UVM_KMF_VAONLY | ((flags & BUS_DMA_NOWAIT) != 0 ? UVM_KMF_NOWAIT : 0); vsize_t align = 0; #ifdef DEBUG_DMA printf("dmamem_map: t=%p segs=%p nsegs=%#x size=%#zx flags=%#x\n", t, segs, nsegs, size, flags); #endif /* DEBUG_DMA */ #ifdef PMAP_MAP_POOLPAGE /* * If all of memory is mapped, and we are mapping a single physically * contiguous area then this area is already mapped. Let's see if we * avoid having a separate mapping for it. */ if (nsegs == 1 && (flags & BUS_DMA_PREFETCHABLE) == 0) { /* * If this is a non-COHERENT mapping, then the existing kernel * mapping is already compatible with it. */ bool direct_mapable = (flags & BUS_DMA_COHERENT) == 0; pa = segs[0].ds_addr; /* * This is a COHERENT mapping which, unless this address is in * a COHERENT dma range, will not be compatible. */ if (t->_ranges != NULL) { const struct arm32_dma_range * const dr = _bus_dma_paddr_inrange(t->_ranges, t->_nranges, pa); if (dr != NULL && (dr->dr_flags & _BUS_DMAMAP_COHERENT)) { direct_mapable = true; } } #ifdef PMAP_NEED_ALLOC_POOLPAGE /* * The page can only be direct mapped if was allocated out * of the arm poolpage vm freelist. */ uvm_physseg_t upm = uvm_physseg_find(atop(pa), NULL); KASSERT(uvm_physseg_valid_p(upm)); if (direct_mapable) { direct_mapable = (arm_poolpage_vmfreelist == uvm_physseg_get_free_list(upm)); } #endif if (direct_mapable) { *kvap = (void *)PMAP_MAP_POOLPAGE(pa); #ifdef DEBUG_DMA printf("dmamem_map: =%p\n", *kvap); #endif /* DEBUG_DMA */ return 0; } } #endif size = round_page(size); #ifdef PMAP_MAPSIZE1 if (size >= PMAP_MAPSIZE1) align = PMAP_MAPSIZE1; #ifdef PMAP_MAPSIZE2 #if PMAP_MAPSIZE1 > PMAP_MAPSIZE2 #error PMAP_MAPSIZE1 must be smaller than PMAP_MAPSIZE2 #endif if (size >= PMAP_MAPSIZE2) align = PMAP_MAPSIZE2; #ifdef PMAP_MAPSIZE3 #if PMAP_MAPSIZE2 > PMAP_MAPSIZE3 #error PMAP_MAPSIZE2 must be smaller than PMAP_MAPSIZE3 #endif if (size >= PMAP_MAPSIZE3) align = PMAP_MAPSIZE3; #endif #endif #endif va = uvm_km_alloc(kernel_map, size, align, kmflags); if (__predict_false(va == 0 && align > 0)) { align = 0; va = uvm_km_alloc(kernel_map, size, 0, kmflags); } if (va == 0) return ENOMEM; *kvap = (void *)va; for (curseg = 0; curseg < nsegs; curseg++) { for (pa = segs[curseg].ds_addr; pa < (segs[curseg].ds_addr + segs[curseg].ds_len); pa += PAGE_SIZE, va += PAGE_SIZE, size -= PAGE_SIZE) { bool uncached = (flags & BUS_DMA_COHERENT); bool prefetchable = (flags & BUS_DMA_PREFETCHABLE); #ifdef DEBUG_DMA printf("wiring P%#" PRIxPADDR " to V%#" PRIxVADDR "\n", pa, va); #endif /* DEBUG_DMA */ if (size == 0) panic("_bus_dmamem_map: size botch"); const struct arm32_dma_range * const dr = _bus_dma_paddr_inrange(t->_ranges, t->_nranges, pa); /* * If this dma region is coherent then there is * no need for an uncached mapping. */ if (dr != NULL && (dr->dr_flags & _BUS_DMAMAP_COHERENT)) { uncached = false; } u_int pmap_flags = PMAP_WIRED; if (prefetchable) pmap_flags |= PMAP_WRITE_COMBINE; else if (uncached) pmap_flags |= PMAP_NOCACHE; pmap_kenter_pa(va, pa, VM_PROT_READ | VM_PROT_WRITE, pmap_flags); } } pmap_update(pmap_kernel()); #ifdef DEBUG_DMA printf("dmamem_map: =%p\n", *kvap); #endif /* DEBUG_DMA */ return 0; } /* * Common function for unmapping DMA-safe memory. May be called by * bus-specific DMA memory unmapping functions. */ void _bus_dmamem_unmap(bus_dma_tag_t t, void *kva, size_t size) { #ifdef DEBUG_DMA printf("dmamem_unmap: t=%p kva=%p size=%#zx\n", t, kva, size); #endif /* DEBUG_DMA */ KASSERTMSG(((uintptr_t)kva & PAGE_MASK) == 0, "kva %p (%#"PRIxPTR")", kva, ((uintptr_t)kva & PAGE_MASK)); #ifdef __HAVE_MM_MD_DIRECT_MAPPED_PHYS /* * Check to see if this used direct mapped memory. Get its physical * address and try to map it. If the resultant matches the kva, then * it was and so we can just return since we have nothing to free up. */ paddr_t pa; vaddr_t va; (void)pmap_extract(pmap_kernel(), (vaddr_t)kva, &pa); if (mm_md_direct_mapped_phys(pa, &va) && va == (vaddr_t)kva) return; #endif size = round_page(size); pmap_kremove((vaddr_t)kva, size); pmap_update(pmap_kernel()); uvm_km_free(kernel_map, (vaddr_t)kva, size, UVM_KMF_VAONLY); } /* * Common function for mmap(2)'ing DMA-safe memory. May be called by * bus-specific DMA mmap(2)'ing functions. */ paddr_t _bus_dmamem_mmap(bus_dma_tag_t t, bus_dma_segment_t *segs, int nsegs, off_t off, int prot, int flags) { paddr_t map_flags; int i; for (i = 0; i < nsegs; i++) { KASSERTMSG((off & PAGE_MASK) == 0, "off %#jx (%#x)", (uintmax_t)off, (int)off & PAGE_MASK); KASSERTMSG((segs[i].ds_addr & PAGE_MASK) == 0, "ds_addr %#lx (%#x)", segs[i].ds_addr, (int)segs[i].ds_addr & PAGE_MASK); KASSERTMSG((segs[i].ds_len & PAGE_MASK) == 0, "ds_len %#lx (%#x)", segs[i].ds_addr, (int)segs[i].ds_addr & PAGE_MASK); if (off >= segs[i].ds_len) { off -= segs[i].ds_len; continue; } map_flags = 0; if (flags & BUS_DMA_PREFETCHABLE) map_flags |= ARM_MMAP_WRITECOMBINE; return arm_btop((u_long)segs[i].ds_addr + off) | map_flags; } /* Page not found. */ return -1; } /********************************************************************** * DMA utility functions **********************************************************************/ /* * Utility function to load a linear buffer. lastaddrp holds state * between invocations (for multiple-buffer loads). segp contains * the starting segment on entrance, and the ending segment on exit. * first indicates if this is the first invocation of this function. */ int _bus_dmamap_load_buffer(bus_dma_tag_t t, bus_dmamap_t map, void *buf, bus_size_t buflen, struct vmspace *vm, int flags) { bus_size_t sgsize; bus_addr_t curaddr; vaddr_t vaddr = (vaddr_t)buf; int error; #ifdef DEBUG_DMA printf("_bus_dmamap_load_buffer(buf=%p, len=%#" PRIxBUSSIZE ", flags=%#x)\n", buf, buflen, flags); #endif /* DEBUG_DMA */ pmap_t pmap = vm_map_pmap(&vm->vm_map); while (buflen > 0) { /* * Get the physical address for this segment. * */ bool coherent; bool ok __diagused; ok = pmap_extract_coherency(pmap, vaddr, &curaddr, &coherent); /* * trying to bus_dmamap_load an unmapped buffer is a * programming error. */ KASSERT(ok); KASSERTMSG((vaddr & PAGE_MASK) == (curaddr & PAGE_MASK), "va %#" PRIxVADDR " curaddr %#" PRIxBUSADDR, vaddr, curaddr); /* * Compute the segment size, and adjust counts. */ sgsize = PAGE_SIZE - ((u_long)vaddr & PGOFSET); if (buflen < sgsize) sgsize = buflen; error = _bus_dmamap_load_paddr(t, map, curaddr, sgsize, coherent); if (error) return error; vaddr += sgsize; buflen -= sgsize; } return 0; } /* * Allocate physical memory from the given physical address range. * Called by DMA-safe memory allocation methods. */ int _bus_dmamem_alloc_range(bus_dma_tag_t t, bus_size_t size, bus_size_t alignment, bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags, paddr_t low, paddr_t high) { paddr_t curaddr, lastaddr; struct vm_page *m; struct pglist mlist; int curseg, error; KASSERTMSG(boundary == 0 || (boundary & (boundary - 1)) == 0, "invalid boundary %#" PRIxBUSSIZE, boundary); #ifdef DEBUG_DMA printf("alloc_range: t=%p size=%#" PRIxBUSSIZE " align=%#" PRIxBUSSIZE " boundary=%#" PRIxBUSSIZE " segs=%p nsegs=%#x rsegs=%p flags=%#x" " lo=%#" PRIxPADDR " hi=%#" PRIxPADDR "\n", t, size, alignment, boundary, segs, nsegs, rsegs, flags, low, high); #endif /* DEBUG_DMA */ /* Always round the size. */ size = round_page(size); /* * We accept boundaries < size, splitting in multiple segments * if needed. uvm_pglistalloc does not, so compute an appropriate * boundary: next power of 2 >= size */ bus_size_t uboundary = boundary; if (uboundary <= PAGE_SIZE) { uboundary = 0; } else { while (uboundary < size) { uboundary <<= 1; } } /* * Allocate pages from the VM system. */ error = uvm_pglistalloc(size, low, high, alignment, uboundary, &mlist, nsegs, (flags & BUS_DMA_NOWAIT) == 0); if (error) return error; /* * Compute the location, size, and number of segments actually * returned by the VM code. */ m = TAILQ_FIRST(&mlist); curseg = 0; lastaddr = segs[curseg].ds_addr = segs[curseg]._ds_paddr = VM_PAGE_TO_PHYS(m); segs[curseg].ds_len = PAGE_SIZE; #ifdef DEBUG_DMA printf("alloc: page %#" PRIxPADDR "\n", lastaddr); #endif /* DEBUG_DMA */ m = TAILQ_NEXT(m, pageq.queue); for (; m != NULL; m = TAILQ_NEXT(m, pageq.queue)) { curaddr = VM_PAGE_TO_PHYS(m); KASSERTMSG(low <= curaddr && curaddr < high, "uvm_pglistalloc returned non-sensicaladdress %#" PRIxPADDR "(low=%#" PRIxPADDR ", high=%#" PRIxPADDR "\n", curaddr, low, high); #ifdef DEBUG_DMA printf("alloc: page %#" PRIxPADDR "\n", curaddr); #endif /* DEBUG_DMA */ if (curaddr == lastaddr + PAGE_SIZE && (lastaddr & boundary) == (curaddr & boundary)) segs[curseg].ds_len += PAGE_SIZE; else { curseg++; if (curseg >= nsegs) { uvm_pglistfree(&mlist); return EFBIG; } segs[curseg].ds_addr = curaddr; segs[curseg]._ds_paddr = curaddr; segs[curseg].ds_len = PAGE_SIZE; } lastaddr = curaddr; } *rsegs = curseg + 1; return 0; } /* * Check if a memory region intersects with a DMA range, and return the * page-rounded intersection if it does. */ int arm32_dma_range_intersect(struct arm32_dma_range *ranges, int nranges, paddr_t pa, psize_t size, paddr_t *pap, psize_t *sizep) { struct arm32_dma_range *dr; int i; if (ranges == NULL) return 0; for (i = 0, dr = ranges; i < nranges; i++, dr++) { if (dr->dr_sysbase <= pa && pa < (dr->dr_sysbase + dr->dr_len)) { /* * Beginning of region intersects with this range. */ *pap = trunc_page(pa); *sizep = round_page(uimin(pa + size, dr->dr_sysbase + dr->dr_len) - pa); return 1; } if (pa < dr->dr_sysbase && dr->dr_sysbase < (pa + size)) { /* * End of region intersects with this range. */ *pap = trunc_page(dr->dr_sysbase); *sizep = round_page(uimin((pa + size) - dr->dr_sysbase, dr->dr_len)); return 1; } } /* No intersection found. */ return 0; } #ifdef _ARM32_NEED_BUS_DMA_BOUNCE static int _bus_dma_alloc_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map, bus_size_t size, int flags) { struct arm32_bus_dma_cookie *cookie = map->_dm_cookie; int error = 0; KASSERT(cookie != NULL); cookie->id_bouncebuflen = round_page(size); error = _bus_dmamem_alloc(t, cookie->id_bouncebuflen, PAGE_SIZE, map->_dm_boundary, cookie->id_bouncesegs, map->_dm_segcnt, &cookie->id_nbouncesegs, flags); if (error == 0) { error = _bus_dmamem_map(t, cookie->id_bouncesegs, cookie->id_nbouncesegs, cookie->id_bouncebuflen, (void **)&cookie->id_bouncebuf, flags); if (error) { _bus_dmamem_free(t, cookie->id_bouncesegs, cookie->id_nbouncesegs); cookie->id_bouncebuflen = 0; cookie->id_nbouncesegs = 0; } else { cookie->id_flags |= _BUS_DMA_HAS_BOUNCE; } } else { cookie->id_bouncebuflen = 0; cookie->id_nbouncesegs = 0; } return error; } static void _bus_dma_free_bouncebuf(bus_dma_tag_t t, bus_dmamap_t map) { struct arm32_bus_dma_cookie *cookie = map->_dm_cookie; KASSERT(cookie != NULL); _bus_dmamem_unmap(t, cookie->id_bouncebuf, cookie->id_bouncebuflen); _bus_dmamem_free(t, cookie->id_bouncesegs, cookie->id_nbouncesegs); cookie->id_bouncebuflen = 0; cookie->id_nbouncesegs = 0; cookie->id_flags &= ~_BUS_DMA_HAS_BOUNCE; } #endif /* _ARM32_NEED_BUS_DMA_BOUNCE */ /* * This function does the same as uiomove, but takes an explicit * direction, and does not update the uio structure. */ static int _bus_dma_uiomove(void *buf, struct uio *uio, size_t n, int direction) { struct iovec *iov; int error; struct vmspace *vm; char *cp; size_t resid, cnt; int i; iov = uio->uio_iov; vm = uio->uio_vmspace; cp = buf; resid = n; for (i = 0; i < uio->uio_iovcnt && resid > 0; i++) { iov = &uio->uio_iov[i]; if (iov->iov_len == 0) continue; cnt = MIN(resid, iov->iov_len); if (!VMSPACE_IS_KERNEL_P(vm)) { preempt_point(); } if (direction == UIO_READ) { error = copyout_vmspace(vm, cp, iov->iov_base, cnt); } else { error = copyin_vmspace(vm, iov->iov_base, cp, cnt); } if (error) return error; cp += cnt; resid -= cnt; } return 0; } int _bus_dmatag_subregion(bus_dma_tag_t tag, bus_addr_t min_addr, bus_addr_t max_addr, bus_dma_tag_t *newtag, int flags) { #ifdef _ARM32_NEED_BUS_DMA_BOUNCE if (min_addr >= max_addr) return EOPNOTSUPP; struct arm32_dma_range *dr; bool psubset = true; size_t nranges = 0; size_t i; for (i = 0, dr = tag->_ranges; i < tag->_nranges; i++, dr++) { /* * If the new {min,max}_addr are narrower than any of the * ranges in the parent tag then we need a new tag; * otherwise the parent tag is a subset of the new * range and can continue to be used. */ if (min_addr > dr->dr_sysbase || max_addr < dr->dr_sysbase + dr->dr_len - 1) { psubset = false; } if (min_addr <= dr->dr_sysbase + dr->dr_len && max_addr >= dr->dr_sysbase) { nranges++; } } if (nranges == 0) { nranges = 1; psubset = false; } if (psubset) { *newtag = tag; /* if the tag must be freed, add a reference */ if (tag->_tag_needs_free) (tag->_tag_needs_free)++; return 0; } const size_t tagsize = sizeof(*tag) + nranges * sizeof(*dr); if ((*newtag = kmem_intr_zalloc(tagsize, (flags & BUS_DMA_NOWAIT) ? KM_NOSLEEP : KM_SLEEP)) == NULL) return ENOMEM; dr = (void *)(*newtag + 1); **newtag = *tag; (*newtag)->_tag_needs_free = 1; (*newtag)->_ranges = dr; (*newtag)->_nranges = nranges; if (tag->_ranges == NULL) { dr->dr_sysbase = min_addr; dr->dr_busbase = min_addr; dr->dr_len = max_addr + 1 - min_addr; } else { struct arm32_dma_range *pdr; for (i = 0, pdr = tag->_ranges; i < tag->_nranges; i++, pdr++) { KASSERT(nranges != 0); if (min_addr > pdr->dr_sysbase + pdr->dr_len || max_addr < pdr->dr_sysbase) { /* * this range doesn't overlap with new limits, * so skip. */ continue; } /* * Copy the range and adjust to fit within the new * limits */ dr[0] = pdr[0]; if (dr->dr_sysbase < min_addr) { psize_t diff = min_addr - dr->dr_sysbase; dr->dr_busbase += diff; dr->dr_len -= diff; dr->dr_sysbase += diff; } if (max_addr <= dr->dr_sysbase + dr->dr_len - 1) { dr->dr_len = max_addr + 1 - dr->dr_sysbase; } dr++; nranges--; } } return 0; #else return EOPNOTSUPP; #endif /* _ARM32_NEED_BUS_DMA_BOUNCE */ } void _bus_dmatag_destroy(bus_dma_tag_t tag) { #ifdef _ARM32_NEED_BUS_DMA_BOUNCE switch (tag->_tag_needs_free) { case 0: break; /* not allocated with kmem */ case 1: { const size_t tagsize = sizeof(*tag) + tag->_nranges * sizeof(*tag->_ranges); kmem_intr_free(tag, tagsize); /* last reference to tag */ break; } default: (tag->_tag_needs_free)--; /* one less reference */ } #endif }