/* $OpenBSD: bus_dma.c,v 1.31 2011/06/23 20:44:38 ariane Exp $ */ /* $NetBSD: bus_dma.c,v 1.40 2000/07/17 04:47:56 thorpej Exp $ */ /*- * Copyright (c) 1997, 1998 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 _ALPHA_BUS_DMA_PRIVATE #include #include #include #include #include #include #include #include #include #include int _bus_dmamap_load_buffer_direct(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t, struct proc *, int, paddr_t *, int *, int); /* * Common function for DMA map creation. May be called by bus-specific * DMA map creation functions. */ int _bus_dmamap_create(t, size, nsegments, maxsegsz, boundary, flags, dmamp) 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 alpha_bus_dmamap *map; void *mapstore; size_t mapsize; /* * 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). */ mapsize = sizeof(struct alpha_bus_dmamap) + (sizeof(bus_dma_segment_t) * (nsegments - 1)); if ((mapstore = malloc(mapsize, M_DEVBUF, (flags & BUS_DMA_NOWAIT) ? (M_NOWAIT | M_ZERO) : (M_WAITOK | M_ZERO))) == NULL) return (ENOMEM); map = (struct alpha_bus_dmamap *)mapstore; map->_dm_size = size; map->_dm_segcnt = nsegments; map->_dm_maxsegsz = maxsegsz; if (t->_boundary != 0 && t->_boundary < boundary) map->_dm_boundary = t->_boundary; else map->_dm_boundary = boundary; map->_dm_flags = flags & ~(BUS_DMA_WAITOK|BUS_DMA_NOWAIT); map->dm_mapsize = 0; /* no valid mappings */ map->dm_nsegs = 0; map->_dm_window = NULL; *dmamp = map; return (0); } /* * Common function for DMA map destruction. May be called by bus-specific * DMA map destruction functions. */ void _bus_dmamap_destroy(t, map) bus_dma_tag_t t; bus_dmamap_t map; { free(map, M_DEVBUF); } /* * 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_direct(t, map, buf, buflen, p, flags, lastaddrp, segp, first) bus_dma_tag_t t; bus_dmamap_t map; void *buf; bus_size_t buflen; struct proc *p; int flags; paddr_t *lastaddrp; int *segp; int first; { bus_size_t sgsize; pmap_t pmap; bus_addr_t curaddr, lastaddr, baddr, bmask; vaddr_t vaddr = (vaddr_t)buf; int seg; if (p != NULL) pmap = p->p_vmspace->vm_map.pmap; else pmap = pmap_kernel(); lastaddr = *lastaddrp; bmask = ~(map->_dm_boundary - 1); for (seg = *segp; buflen > 0 ; ) { /* * Get the physical address for this segment. */ pmap_extract(pmap, vaddr, &curaddr); /* * If we're beyond the current DMA window, indicate * that and try to fall back into SGMAPs. */ if (t->_wsize != 0 && curaddr >= t->_wsize) return (EINVAL); curaddr |= t->_wbase; /* * Compute the segment size, and adjust counts. */ sgsize = PAGE_SIZE - ((u_long)vaddr & PGOFSET); if (buflen < sgsize) sgsize = buflen; if (map->_dm_maxsegsz < sgsize) sgsize = map->_dm_maxsegsz; /* * Make sure we don't cross any boundaries. */ if (map->_dm_boundary > 0) { 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 (first) { map->dm_segs[seg].ds_addr = curaddr; map->dm_segs[seg].ds_len = sgsize; first = 0; } else { if ((map->_dm_flags & DMAMAP_NO_COALESCE) == 0 && curaddr == lastaddr && (map->dm_segs[seg].ds_len + sgsize) <= map->_dm_maxsegsz && (map->_dm_boundary == 0 || (map->dm_segs[seg].ds_addr & bmask) == (curaddr & bmask))) map->dm_segs[seg].ds_len += sgsize; else { if (++seg >= map->_dm_segcnt) break; map->dm_segs[seg].ds_addr = curaddr; map->dm_segs[seg].ds_len = sgsize; } } lastaddr = curaddr + sgsize; vaddr += sgsize; buflen -= sgsize; } *segp = seg; *lastaddrp = lastaddr; /* * Did we fit? */ if (buflen != 0) { /* * If there is a chained window, we will automatically * fall back to it. */ return (EFBIG); /* XXX better return value here? */ } return (0); } /* * Common function for loading a direct-mapped DMA map with a linear * buffer. Called by bus-specific DMA map load functions with the * OR value appropriate for indicating "direct-mapped" for that * chipset. */ int _bus_dmamap_load_direct(t, map, buf, buflen, p, flags) bus_dma_tag_t t; bus_dmamap_t map; void *buf; bus_size_t buflen; struct proc *p; int flags; { paddr_t lastaddr; int seg, error; /* * Make sure that on error condition we return "no valid mappings". */ map->dm_mapsize = 0; map->dm_nsegs = 0; KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0); if (buflen > map->_dm_size) return (EINVAL); seg = 0; error = _bus_dmamap_load_buffer_direct(t, map, buf, buflen, p, flags, &lastaddr, &seg, 1); if (error == 0) { map->dm_mapsize = buflen; map->dm_nsegs = seg + 1; map->_dm_window = t; } else if (t->_next_window != NULL) { /* * Give the next window a chance. */ error = bus_dmamap_load(t->_next_window, map, buf, buflen, p, flags); } return (error); } /* * Like _bus_dmamap_load_direct(), but for mbufs. */ int _bus_dmamap_load_mbuf_direct(t, map, m0, flags) bus_dma_tag_t t; bus_dmamap_t map; struct mbuf *m0; int flags; { paddr_t lastaddr; int seg, error, first; struct mbuf *m; /* * Make sure that on error condition we return "no valid mappings." */ map->dm_mapsize = 0; map->dm_nsegs = 0; KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0); #ifdef DIAGNOSTIC if ((m0->m_flags & M_PKTHDR) == 0) panic("_bus_dmamap_load_mbuf_direct: no packet header"); #endif if (m0->m_pkthdr.len > map->_dm_size) return (EINVAL); first = 1; seg = 0; error = 0; for (m = m0; m != NULL && error == 0; m = m->m_next) { if (m->m_len == 0) continue; error = _bus_dmamap_load_buffer_direct(t, map, m->m_data, m->m_len, NULL, flags, &lastaddr, &seg, first); first = 0; } if (error == 0) { map->dm_mapsize = m0->m_pkthdr.len; map->dm_nsegs = seg + 1; map->_dm_window = t; } else if (t->_next_window != NULL) { /* * Give the next window a chance. */ error = bus_dmamap_load_mbuf(t->_next_window, map, m0, flags); } return (error); } /* * Like _bus_dmamap_load_direct(), but for uios. */ int _bus_dmamap_load_uio_direct(t, map, uio, flags) bus_dma_tag_t t; bus_dmamap_t map; struct uio *uio; int flags; { paddr_t lastaddr; int seg, i, error, first; bus_size_t minlen, resid; struct proc *p = NULL; struct iovec *iov; caddr_t addr; /* * Make sure that on error condition we return "no valid mappings." */ map->dm_mapsize = 0; map->dm_nsegs = 0; KASSERT((map->_dm_flags & (BUS_DMA_READ|BUS_DMA_WRITE)) == 0); resid = uio->uio_resid; iov = uio->uio_iov; if (uio->uio_segflg == UIO_USERSPACE) { p = uio->uio_procp; #ifdef DIAGNOSTIC if (p == NULL) panic("_bus_dmamap_load_uio_direct: " "USERSPACE but no proc"); #endif } first = 1; seg = 0; 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 = (caddr_t)iov[i].iov_base; error = _bus_dmamap_load_buffer_direct(t, map, addr, minlen, p, flags, &lastaddr, &seg, first); first = 0; resid -= minlen; } if (error == 0) { map->dm_mapsize = uio->uio_resid; map->dm_nsegs = seg + 1; map->_dm_window = t; } else if (t->_next_window != NULL) { /* * Give the next window a chance. */ error = bus_dmamap_load_uio(t->_next_window, map, uio, flags); } return (error); } /* * Like _bus_dmamap_load_direct(), but for raw memory. */ int _bus_dmamap_load_raw_direct(t, map, segs, nsegs, size, flags) bus_dma_tag_t t; bus_dmamap_t map; bus_dma_segment_t *segs; int nsegs; bus_size_t size; int flags; { panic("_bus_dmamap_load_raw_direct: not implemented"); } /* * Common function for unloading a DMA map. May be called by * chipset-specific DMA map unload functions. */ void _bus_dmamap_unload(t, map) bus_dma_tag_t t; bus_dmamap_t map; { /* * No resources to free; just mark the mappings as * invalid. */ map->dm_mapsize = 0; map->dm_nsegs = 0; map->_dm_window = NULL; map->_dm_flags &= ~(BUS_DMA_READ|BUS_DMA_WRITE); } /* * Common function for DMA map synchronization. May be called * by chipset-specific DMA map synchronization functions. */ void _bus_dmamap_sync(t, map, offset, len, op) bus_dma_tag_t t; bus_dmamap_t map; bus_addr_t offset; bus_size_t len; int op; { /* * Flush the store buffer. */ alpha_mb(); } /* * Common function for DMA-safe memory allocation. May be called * by bus-specific DMA memory allocation functions. */ int _bus_dmamem_alloc(t, size, alignment, boundary, segs, nsegs, rsegs, flags) bus_dma_tag_t t; bus_size_t size, alignment, boundary; bus_dma_segment_t *segs; int nsegs; int *rsegs; int flags; { return (_bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs, flags, (paddr_t)0, (paddr_t)-1)); } /* * Allocate physical memory from the given physical address range. * Called by DMA-safe memory allocation methods. */ int _bus_dmamem_alloc_range(t, size, alignment, boundary, segs, nsegs, rsegs, flags, low, high) bus_dma_tag_t t; bus_size_t size, alignment, 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, plaflag; /* Always round the size. */ size = round_page(size); /* * Allocate pages from the VM system. */ plaflag = flags & BUS_DMA_NOWAIT ? UVM_PLA_NOWAIT : UVM_PLA_WAITOK; if (flags & BUS_DMA_ZERO) plaflag |= UVM_PLA_ZERO; TAILQ_INIT(&mlist); error = uvm_pglistalloc(size, low, high, alignment, boundary, &mlist, nsegs, plaflag); 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 = VM_PAGE_TO_PHYS(m); segs[curseg].ds_len = PAGE_SIZE; m = TAILQ_NEXT(m, pageq); for (; m != TAILQ_END(&mlist); m = TAILQ_NEXT(m, pageq)) { curaddr = VM_PAGE_TO_PHYS(m); #ifdef DIAGNOSTIC if (curaddr < low || curaddr >= high) { printf("uvm_pglistalloc returned non-sensical" " address 0x%lx\n", curaddr); panic("_bus_dmamem_alloc"); } #endif if (curaddr == (lastaddr + PAGE_SIZE)) segs[curseg].ds_len += PAGE_SIZE; else { curseg++; segs[curseg].ds_addr = curaddr; segs[curseg].ds_len = PAGE_SIZE; } lastaddr = curaddr; } *rsegs = curseg + 1; return (0); } /* * Common function for freeing DMA-safe memory. May be called by * bus-specific DMA memory free functions. */ void _bus_dmamem_free(t, segs, nsegs) 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; /* * 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); } } uvm_pglistfree(&mlist); } /* * Common function for mapping DMA-safe memory. May be called by * bus-specific DMA memory map functions. */ int _bus_dmamem_map(t, segs, nsegs, size, kvap, flags) bus_dma_tag_t t; bus_dma_segment_t *segs; int nsegs; size_t size; caddr_t *kvap; int flags; { vaddr_t va, sva; size_t ssize; bus_addr_t addr; int curseg, error; /* * If we're only mapping 1 segment, use K0SEG, to avoid * TLB thrashing. */ if (nsegs == 1) { *kvap = (caddr_t)ALPHA_PHYS_TO_K0SEG(segs[0].ds_addr); return (0); } size = round_page(size); va = uvm_km_valloc(kernel_map, size); if (va == 0) return (ENOMEM); *kvap = (caddr_t)va; sva = va; ssize = size; for (curseg = 0; curseg < nsegs; curseg++) { for (addr = segs[curseg].ds_addr; addr < (segs[curseg].ds_addr + segs[curseg].ds_len); addr += PAGE_SIZE, va += PAGE_SIZE, size -= PAGE_SIZE) { if (size == 0) panic("_bus_dmamem_map: size botch"); error = pmap_enter(pmap_kernel(), va, addr, VM_PROT_READ | VM_PROT_WRITE, VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED | PMAP_CANFAIL); if (error) { pmap_update(pmap_kernel()); uvm_km_free(kernel_map, sva, ssize); return (error); } } } pmap_update(pmap_kernel()); return (0); } /* * Common function for unmapping DMA-safe memory. May be called by * bus-specific DMA memory unmapping functions. */ void _bus_dmamem_unmap(t, kva, size) bus_dma_tag_t t; caddr_t kva; size_t size; { #ifdef DIAGNOSTIC if ((u_long)kva & PGOFSET) panic("_bus_dmamem_unmap"); #endif /* * Nothing to do if we mapped it with K0SEG. */ if (kva >= (caddr_t)ALPHA_K0SEG_BASE && kva <= (caddr_t)ALPHA_K0SEG_END) return; size = round_page(size); uvm_km_free(kernel_map, (vaddr_t)kva, size); } /* * 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(t, segs, nsegs, off, prot, flags) bus_dma_tag_t t; bus_dma_segment_t *segs; int nsegs; off_t off; int prot, flags; { int i; for (i = 0; i < nsegs; i++) { #ifdef DIAGNOSTIC if (off & PGOFSET) panic("_bus_dmamem_mmap: offset unaligned"); if (segs[i].ds_addr & PGOFSET) panic("_bus_dmamem_mmap: segment unaligned"); if (segs[i].ds_len & PGOFSET) panic("_bus_dmamem_mmap: segment size not multiple" " of page size"); #endif if (off >= segs[i].ds_len) { off -= segs[i].ds_len; continue; } return (segs[i].ds_addr + off); } /* Page not found. */ return (-1); }