/* $OpenBSD: iommu.c,v 1.46 2007/04/04 20:09:37 kettenis Exp $ */ /* $NetBSD: iommu.c,v 1.47 2002/02/08 20:03:45 eeh Exp $ */ /* * Copyright (c) 2003 Henric Jungheim * Copyright (c) 2001, 2002 Eduardo Horvath * Copyright (c) 1999, 2000 Matthew R. Green * All rights reserved. * * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. */ /* * UltraSPARC IOMMU support; used by both the sbus and pci code. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DDB #include #include #include #endif #ifdef DEBUG #define IDB_BUSDMA 0x1 #define IDB_IOMMU 0x2 #define IDB_INFO 0x4 #define IDB_SYNC 0x8 #define IDB_XXX 0x10 #define IDB_PRINT_MAP 0x20 #define IDB_BREAK 0x40 int iommudebug = IDB_INFO; #define DPRINTF(l, s) do { if (iommudebug & l) printf s; } while (0) #else #define DPRINTF(l, s) #endif void iommu_enter(struct iommu_state *, struct strbuf_ctl *, vaddr_t, paddr_t, int); void iommu_remove(struct iommu_state *, struct strbuf_ctl *, vaddr_t); int iommu_dvmamap_sync_range(struct strbuf_ctl*, vaddr_t, bus_size_t); int iommu_strbuf_flush_done(struct iommu_map_state *); int iommu_dvmamap_load_seg(bus_dma_tag_t, struct iommu_state *, bus_dmamap_t, bus_dma_segment_t *, int, int, bus_size_t, bus_size_t); int iommu_dvmamap_load_mlist(bus_dma_tag_t, struct iommu_state *, bus_dmamap_t, struct pglist *, int, bus_size_t, bus_size_t); int iommu_dvmamap_validate_map(bus_dma_tag_t, struct iommu_state *, bus_dmamap_t); void iommu_dvmamap_print_map(bus_dma_tag_t, struct iommu_state *, bus_dmamap_t); int iommu_dvmamap_append_range(bus_dma_tag_t, bus_dmamap_t, paddr_t, bus_size_t, int, bus_size_t); int64_t iommu_tsb_entry(struct iommu_state *, vaddr_t); void strbuf_reset(struct strbuf_ctl *); int iommu_iomap_insert_page(struct iommu_map_state *, paddr_t); vaddr_t iommu_iomap_translate(struct iommu_map_state *, paddr_t); int iommu_iomap_load_map(struct iommu_state *, struct iommu_map_state *, vaddr_t, int); int iommu_iomap_unload_map(struct iommu_state *, struct iommu_map_state *); struct iommu_map_state *iommu_iomap_create(int); void iommu_iomap_destroy(struct iommu_map_state *); void iommu_iomap_clear_pages(struct iommu_map_state *); void _iommu_dvmamap_sync(bus_dma_tag_t, bus_dma_tag_t, bus_dmamap_t, bus_addr_t, bus_size_t, int); /* * Initiate an STC entry flush. */ static inline void iommu_strbuf_flush(struct strbuf_ctl *sb, vaddr_t va) { #ifdef DEBUG if (sb->sb_flush == NULL) { printf("iommu_strbuf_flush: attempting to flush w/o STC\n"); return; } #endif bus_space_write_8(sb->sb_bustag, sb->sb_sb, STRBUFREG(strbuf_pgflush), va); } /* * initialise the UltraSPARC IOMMU (SBUS or PCI): * - allocate and setup the iotsb. * - enable the IOMMU * - initialise the streaming buffers (if they exist) * - create a private DVMA map. */ void iommu_init(char *name, struct iommu_state *is, int tsbsize, u_int32_t iovabase) { psize_t size; vaddr_t va; paddr_t pa; struct vm_page *m; struct pglist mlist; /* * Setup the iommu. * * The sun4u iommu is part of the SBUS or PCI controller so we will * deal with it here.. * * For sysio and psycho/psycho+ the IOMMU address space always ends at * 0xffffe000, but the starting address depends on the size of the * map. The map size is 1024 * 2 ^ is->is_tsbsize entries, where each * entry is 8 bytes. The start of the map can be calculated by * (0xffffe000 << (8 + is->is_tsbsize)). * * But sabre and hummingbird use a different scheme that seems to * be hard-wired, so we read the start and size from the PROM and * just use those values. */ is->is_cr = IOMMUCR_EN; is->is_tsbsize = tsbsize; if (iovabase == (u_int32_t)-1) { is->is_dvmabase = IOTSB_VSTART(is->is_tsbsize); is->is_dvmaend = IOTSB_VEND; } else { is->is_dvmabase = iovabase; is->is_dvmaend = iovabase + IOTSB_VSIZE(tsbsize) - 1; } /* * Allocate memory for I/O pagetables. They need to be physically * contiguous. */ size = PAGE_SIZE << is->is_tsbsize; TAILQ_INIT(&mlist); if (uvm_pglistalloc((psize_t)size, (paddr_t)0, (paddr_t)-1, (paddr_t)PAGE_SIZE, (paddr_t)0, &mlist, 1, 0) != 0) panic("iommu_init: no memory"); va = uvm_km_valloc(kernel_map, size); if (va == 0) panic("iommu_init: no memory"); is->is_tsb = (int64_t *)va; m = TAILQ_FIRST(&mlist); is->is_ptsb = VM_PAGE_TO_PHYS(m); /* Map the pages */ for (; m != NULL; m = TAILQ_NEXT(m,pageq)) { pa = VM_PAGE_TO_PHYS(m); pmap_enter(pmap_kernel(), va, pa | PMAP_NVC, VM_PROT_READ|VM_PROT_WRITE, VM_PROT_READ|VM_PROT_WRITE|PMAP_WIRED); va += PAGE_SIZE; } pmap_update(pmap_kernel()); memset(is->is_tsb, 0, size); #ifdef DEBUG if (iommudebug & IDB_INFO) { /* Probe the iommu */ /* The address or contents of the regs...? */ printf("iommu regs at: cr=%lx tsb=%lx flush=%lx\n", (u_long)bus_space_vaddr(is->is_bustag, is->is_iommu) + IOMMUREG(iommu_cr), (u_long)bus_space_vaddr(is->is_bustag, is->is_iommu) + IOMMUREG(iommu_tsb), (u_long)bus_space_vaddr(is->is_bustag, is->is_iommu) + IOMMUREG(iommu_flush)); printf("iommu cr=%llx tsb=%llx\n", IOMMUREG_READ(is, iommu_cr), IOMMUREG_READ(is, iommu_tsb)); printf("TSB base %p phys %llx\n", (void *)is->is_tsb, (unsigned long long)is->is_ptsb); delay(1000000); /* 1 s */ } #endif /* * Now all the hardware's working we need to allocate a dvma map. */ printf("dvma map %x-%x, ", is->is_dvmabase, is->is_dvmaend); printf("iotdb %llx-%llx", (unsigned long long)is->is_ptsb, (unsigned long long)(is->is_ptsb + size)); is->is_dvmamap = extent_create(name, is->is_dvmabase, (u_long)is->is_dvmaend + 1, M_DEVBUF, 0, 0, EX_NOWAIT); /* * Set the TSB size. The relevant bits were moved to the TSB * base register in the PCIe host bridges. */ if (strncmp(name, "pyro", 4) == 0) is->is_ptsb |= is->is_tsbsize; else is->is_cr |= (is->is_tsbsize << 16); /* * Now actually start up the IOMMU. */ iommu_reset(is); printf("\n"); } /* * Streaming buffers don't exist on the UltraSPARC IIi/e; we should have * detected that already and disabled them. If not, we will notice that * they aren't there when the STRBUF_EN bit does not remain. */ void iommu_reset(struct iommu_state *is) { int i; IOMMUREG_WRITE(is, iommu_tsb, is->is_ptsb); /* Enable IOMMU */ IOMMUREG_WRITE(is, iommu_cr, is->is_cr); for (i = 0; i < 2; ++i) { struct strbuf_ctl *sb = is->is_sb[i]; if (sb == NULL) continue; sb->sb_iommu = is; strbuf_reset(sb); if (sb->sb_flush) printf(", STC%d enabled", i); } } /* * Initialize one STC. */ void strbuf_reset(struct strbuf_ctl *sb) { if(sb->sb_flush == NULL) return; bus_space_write_8(sb->sb_bustag, sb->sb_sb, STRBUFREG(strbuf_ctl), STRBUF_EN); membar(Lookaside); /* No streaming buffers? Disable them */ if (bus_space_read_8(sb->sb_bustag, sb->sb_sb, STRBUFREG(strbuf_ctl)) == 0) { sb->sb_flush = NULL; } else { /* * locate the pa of the flush buffer */ if (pmap_extract(pmap_kernel(), (vaddr_t)sb->sb_flush, &sb->sb_flushpa) == FALSE) sb->sb_flush = NULL; } } /* * Add an entry to the IOMMU table. * * The entry is marked streaming if an STC was detected and * the BUS_DMA_STREAMING flag is set. */ void iommu_enter(struct iommu_state *is, struct strbuf_ctl *sb, vaddr_t va, paddr_t pa, int flags) { int64_t tte; volatile int64_t *tte_ptr = &is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)]; #ifdef DIAGNOSTIC if (va < is->is_dvmabase || (va + PAGE_MASK) > is->is_dvmaend) panic("iommu_enter: va %#lx not in DVMA space", va); tte = *tte_ptr; if (tte & IOTTE_V) { printf("Overwriting valid tte entry (dva %lx pa %lx " "&tte %p tte %llx)\n", va, pa, tte_ptr, tte); extent_print(is->is_dvmamap); panic("IOMMU overwrite"); } #endif tte = MAKEIOTTE(pa, !(flags & BUS_DMA_NOWRITE), !(flags & BUS_DMA_NOCACHE), (flags & BUS_DMA_STREAMING)); DPRINTF(IDB_IOMMU, ("Clearing TSB slot %d for va %p\n", (int)IOTSBSLOT(va,is->is_tsbsize), (void *)(u_long)va)); *tte_ptr = tte; /* * Why bother to flush this va? It should only be relevant for * V ==> V or V ==> non-V transitions. The former is illegal and * the latter is never done here. It is true that this provides * some protection against a misbehaving master using an address * after it should. The IOMMU documentations specifically warns * that the consequences of a simultaneous IOMMU flush and DVMA * access to the same address are undefined. (By that argument, * the STC should probably be flushed as well.) Note that if * a bus master keeps using a memory region after it has been * unmapped, the specific behavior of the IOMMU is likely to * be the least of our worries. */ IOMMUREG_WRITE(is, iommu_flush, va); DPRINTF(IDB_IOMMU, ("iommu_enter: va %lx pa %lx TSB[%lx]@%p=%lx\n", va, (long)pa, (u_long)IOTSBSLOT(va,is->is_tsbsize), (void *)(u_long)&is->is_tsb[IOTSBSLOT(va,is->is_tsbsize)], (u_long)tte)); } /* * Remove an entry from the IOMMU table. * * The entry is flushed from the STC if an STC is detected and the TSB * entry has the IOTTE_STREAM flags set. It should be impossible for * the TSB entry to have this flag set without the BUS_DMA_STREAMING * flag, but better to be safe. (The IOMMU will be ignored as long * as an STC entry exists.) */ void iommu_remove(struct iommu_state *is, struct strbuf_ctl *sb, vaddr_t va) { int64_t *tte_ptr = &is->is_tsb[IOTSBSLOT(va, is->is_tsbsize)]; int64_t tte; #ifdef DIAGNOSTIC if (va < is->is_dvmabase || (va + PAGE_MASK) > is->is_dvmaend) panic("iommu_remove: va 0x%lx not in DVMA space", (u_long)va); if (va != trunc_page(va)) { printf("iommu_remove: unaligned va: %lx\n", va); va = trunc_page(va); } #endif tte = *tte_ptr; DPRINTF(IDB_IOMMU, ("iommu_remove: va %lx TSB[%llx]@%p\n", va, tte, tte_ptr)); #ifdef DIAGNOSTIC if ((tte & IOTTE_V) == 0) { printf("Removing invalid tte entry (dva %lx &tte %p " "tte %llx)\n", va, tte_ptr, tte); extent_print(is->is_dvmamap); panic("IOMMU remove overwrite"); } #endif *tte_ptr = tte & ~IOTTE_V; /* * IO operations are strongly ordered WRT each other. It is * unclear how they relate to normal memory accesses. */ membar(StoreStore); IOMMUREG_WRITE(is, iommu_flush, va); if (sb && (tte & IOTTE_STREAM)) iommu_strbuf_flush(sb, va); /* Should we sync the iommu and stc here? */ } /* * Find the physical address of a DVMA address (debug routine). */ paddr_t iommu_extract(struct iommu_state *is, vaddr_t dva) { int64_t tte = 0; if (dva >= is->is_dvmabase && dva <= is->is_dvmaend) tte = is->is_tsb[IOTSBSLOT(dva, is->is_tsbsize)]; return (tte & IOTTE_PAMASK); } /* * Lookup a TSB entry for a given DVMA (debug routine). */ int64_t iommu_lookup_tte(struct iommu_state *is, vaddr_t dva) { int64_t tte = 0; if (dva >= is->is_dvmabase && dva <= is->is_dvmaend) tte = is->is_tsb[IOTSBSLOT(dva, is->is_tsbsize)]; return (tte); } /* * Lookup a TSB entry at a given physical address (debug routine). */ int64_t iommu_fetch_tte(struct iommu_state *is, paddr_t pa) { int64_t tte = 0; if (pa >= is->is_ptsb && pa < is->is_ptsb + (PAGE_SIZE << is->is_tsbsize)) tte = ldxa(pa, ASI_PHYS_CACHED); return (tte); } /* * Fetch a TSB entry with some sanity checking. */ int64_t iommu_tsb_entry(struct iommu_state *is, vaddr_t dva) { int64_t tte; if (dva < is->is_dvmabase || dva > is->is_dvmaend) panic("invalid dva: %llx", (long long)dva); tte = is->is_tsb[IOTSBSLOT(dva,is->is_tsbsize)]; if ((tte & IOTTE_V) == 0) panic("iommu_tsb_entry: invalid entry %lx", dva); return (tte); } /* * Initiate and then block until an STC flush synchronization has completed. */ int iommu_strbuf_flush_done(struct iommu_map_state *ims) { struct strbuf_ctl *sb = ims->ims_sb; struct strbuf_flush *sf = &ims->ims_flush; struct timeval cur, flushtimeout; struct timeval to = { 0, 500000 }; u_int64_t flush; int timeout_started = 0; #ifdef DIAGNOSTIC if (sb == NULL) { panic("iommu_strbuf_flush_done: invalid flush buffer"); } #endif /* * Streaming buffer flushes: * * 1 Tell strbuf to flush by storing va to strbuf_pgflush. * 2 Store 0 in flag * 3 Store pointer to flag in flushsync * 4 wait till flushsync becomes 0x1 * * If it takes more than .5 sec, something went very, very wrong. */ /* * If we're reading from ASI_PHYS_CACHED, then we'll write to * it too. No need to tempt fate or learn about Si bugs or such. * FreeBSD just uses normal "volatile" reads/writes... */ stxa(sf->sbf_flushpa, ASI_PHYS_CACHED, 0); /* * Insure any previous strbuf operations are complete and that * memory is initialized before the IOMMU uses it. * Is this Needed? How are IO and memory operations ordered? */ membar(StoreStore); bus_space_write_8(sb->sb_bustag, sb->sb_sb, STRBUFREG(strbuf_flushsync), sf->sbf_flushpa); DPRINTF(IDB_IOMMU, ("iommu_strbuf_flush_done: flush = %llx pa = %lx\n", ldxa(sf->sbf_flushpa, ASI_PHYS_CACHED), sf->sbf_flushpa)); membar(StoreLoad | Lookaside); for(;;) { int i; /* * Try to shave a few instruction cycles off the average * latency by only checking the elapsed time every few * fetches. */ for (i = 0; i < 1000; ++i) { membar(LoadLoad); /* Bypass non-coherent D$ */ /* non-coherent...? Huh? */ flush = ldxa(sf->sbf_flushpa, ASI_PHYS_CACHED); if (flush) { DPRINTF(IDB_IOMMU, ("iommu_strbuf_flush_done: flushed\n")); return (0); } } microtime(&cur); if (timeout_started) { if (timercmp(&cur, &flushtimeout, >)) panic("STC timeout at %lx (%lld)", sf->sbf_flushpa, flush); } else { timeradd(&cur, &to, &flushtimeout); timeout_started = 1; DPRINTF(IDB_IOMMU, ("iommu_strbuf_flush_done: flush = %llx pa = %lx " "now=%lx:%lx until = %lx:%lx\n", ldxa(sf->sbf_flushpa, ASI_PHYS_CACHED), sf->sbf_flushpa, cur.tv_sec, cur.tv_usec, flushtimeout.tv_sec, flushtimeout.tv_usec)); } } } /* * IOMMU DVMA operations, common to SBUS and PCI. */ #define BUS_DMA_FIND_PARENT(t, fn) \ if (t->_parent == NULL) \ panic("null bus_dma parent (" #fn ")"); \ for (t = t->_parent; t->fn == NULL; t = t->_parent) \ if (t->_parent == NULL) \ panic("no bus_dma " #fn " located"); int iommu_dvmamap_create(bus_dma_tag_t t, bus_dma_tag_t t0, struct strbuf_ctl *sb, bus_size_t size, int nsegments, bus_size_t maxsegsz, bus_size_t boundary, int flags, bus_dmamap_t *dmamap) { int ret; bus_dmamap_t map; struct iommu_map_state *ims; BUS_DMA_FIND_PARENT(t, _dmamap_create); ret = (*t->_dmamap_create)(t, t0, size, nsegments, maxsegsz, boundary, flags, &map); if (ret) return (ret); ims = iommu_iomap_create(atop(round_page(size))); if (ims == NULL) { bus_dmamap_destroy(t0, map); return (ENOMEM); } ims->ims_sb = sb; map->_dm_cookie = ims; #ifdef DIAGNOSTIC if (ims->ims_sb == NULL) panic("iommu_dvmamap_create: null sb"); if (ims->ims_sb->sb_iommu == NULL) panic("iommu_dvmamap_create: null iommu"); #endif *dmamap = map; return (0); } void iommu_dvmamap_destroy(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map) { /* * The specification (man page) requires a loaded * map to be unloaded before it is destroyed. */ if (map->dm_nsegs) bus_dmamap_unload(t0, map); if (map->_dm_cookie) iommu_iomap_destroy(map->_dm_cookie); map->_dm_cookie = NULL; BUS_DMA_FIND_PARENT(t, _dmamap_destroy); (*t->_dmamap_destroy)(t, t0, map); } /* * Load a contiguous kva buffer into a dmamap. The physical pages are * not assumed to be contiguous. Two passes are made through the buffer * and both call pmap_extract() for the same va->pa translations. It * is possible to run out of pa->dvma mappings; the code should be smart * enough to resize the iomap (when the "flags" permit allocation). It * is trivial to compute the number of entries required (round the length * up to the page size and then divide by the page size)... */ int iommu_dvmamap_load(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map, void *buf, bus_size_t buflen, struct proc *p, int flags) { int s; int err = 0; bus_size_t sgsize; u_long dvmaddr, sgstart, sgend; bus_size_t align, boundary; struct iommu_state *is; struct iommu_map_state *ims = map->_dm_cookie; pmap_t pmap; #ifdef DIAGNOSTIC if (ims == NULL) panic("iommu_dvmamap_load: null map state"); #endif #ifdef DEBUG if (ims->ims_sb == NULL) panic("iommu_dvmamap_load: null sb"); if (ims->ims_sb->sb_iommu == NULL) panic("iommu_dvmamap_load: null iommu"); #endif /* DEBUG */ is = ims->ims_sb->sb_iommu; if (map->dm_nsegs) { /* * Is it still in use? _bus_dmamap_load should have taken care * of this. */ #ifdef DIAGNOSTIC panic("iommu_dvmamap_load: map still in use"); #endif bus_dmamap_unload(t0, map); } /* * Make sure that on error condition we return "no valid mappings". */ map->dm_nsegs = 0; if (buflen < 1 || buflen > map->_dm_size) { DPRINTF(IDB_BUSDMA, ("iommu_dvmamap_load(): error %d > %d -- " "map size exceeded!\n", (int)buflen, (int)map->_dm_size)); return (EINVAL); } /* * A boundary presented to bus_dmamem_alloc() takes precedence * over boundary in the map. */ if ((boundary = (map->dm_segs[0]._ds_boundary)) == 0) boundary = map->_dm_boundary; align = MAX(map->dm_segs[0]._ds_align, PAGE_SIZE); pmap = p ? p->p_vmspace->vm_map.pmap : pmap = pmap_kernel(); /* Count up the total number of pages we need */ iommu_iomap_clear_pages(ims); { /* Scope */ bus_addr_t a, aend; bus_addr_t addr = (vaddr_t)buf; int seg_len = buflen; aend = round_page(addr + seg_len); for (a = trunc_page(addr); a < aend; a += PAGE_SIZE) { paddr_t pa; if (pmap_extract(pmap, a, &pa) == FALSE) { printf("iomap pmap error addr 0x%llx\n", a); iommu_iomap_clear_pages(ims); return (EFBIG); } err = iommu_iomap_insert_page(ims, pa); if (err) { printf("iomap insert error: %d for " "va 0x%llx pa 0x%lx " "(buf %p len %lld/%llx)\n", err, a, pa, buf, buflen, buflen); iommu_dvmamap_print_map(t, is, map); iommu_iomap_clear_pages(ims); return (EFBIG); } } } sgsize = ims->ims_map.ipm_pagecnt * PAGE_SIZE; if (flags & BUS_DMA_24BIT) { sgstart = MAX(is->is_dvmamap->ex_start, 0xff000000); sgend = MIN(is->is_dvmamap->ex_end, 0xffffffff); } else { sgstart = is->is_dvmamap->ex_start; sgend = is->is_dvmamap->ex_end; } /* * If our segment size is larger than the boundary we need to * split the transfer up into little pieces ourselves. */ s = splhigh(); err = extent_alloc_subregion(is->is_dvmamap, sgstart, sgend, sgsize, align, 0, (sgsize > boundary) ? 0 : boundary, EX_NOWAIT | EX_BOUNDZERO, (u_long *)&dvmaddr); splx(s); #ifdef DEBUG if (err || (dvmaddr == (bus_addr_t)-1)) { printf("iommu_dvmamap_load(): extent_alloc(%d, %x) failed!\n", (int)sgsize, flags); #ifdef DDB if (iommudebug & IDB_BREAK) Debugger(); #endif } #endif if (err != 0) return (err); if (dvmaddr == (bus_addr_t)-1) return (ENOMEM); /* Set the active DVMA map */ map->_dm_dvmastart = dvmaddr; map->_dm_dvmasize = sgsize; map->dm_mapsize = buflen; #ifdef DEBUG iommu_dvmamap_validate_map(t, is, map); #endif if (iommu_iomap_load_map(is, ims, dvmaddr, flags)) return (EFBIG); { /* Scope */ bus_addr_t a, aend; bus_addr_t addr = (vaddr_t)buf; int seg_len = buflen; aend = round_page(addr + seg_len); for (a = trunc_page(addr); a < aend; a += PAGE_SIZE) { bus_addr_t pgstart; bus_addr_t pgend; paddr_t pa; int pglen; /* Yuck... Redoing the same pmap_extract... */ if (pmap_extract(pmap, a, &pa) == FALSE) { printf("iomap pmap error addr 0x%llx\n", a); iommu_iomap_clear_pages(ims); return (EFBIG); } pgstart = pa | (MAX(a, addr) & PAGE_MASK); pgend = pa | (MIN(a + PAGE_SIZE - 1, addr + seg_len - 1) & PAGE_MASK); pglen = pgend - pgstart + 1; if (pglen < 1) continue; err = iommu_dvmamap_append_range(t, map, pgstart, pglen, flags, boundary); if (err == EFBIG) return (err); if (err) { printf("iomap load seg page: %d for " "va 0x%llx pa %lx (%llx - %llx) " "for %d/0x%x\n", err, a, pa, pgstart, pgend, pglen, pglen); return (err); } } } #ifdef DIAGNOSTIC iommu_dvmamap_validate_map(t, is, map); #endif #ifdef DEBUG if (err) printf("**** iommu_dvmamap_load failed with error %d\n", err); if (err || (iommudebug & IDB_PRINT_MAP)) { iommu_dvmamap_print_map(t, is, map); #ifdef DDB if (iommudebug & IDB_BREAK) Debugger(); #endif } #endif return (err); } /* * Load a dvmamap from an array of segs or an mlist (if the first * "segs" entry's mlist is non-null). It calls iommu_dvmamap_load_segs() * or iommu_dvmamap_load_mlist() for part of the 2nd pass through the * mapping. This is ugly. A better solution would probably be to have * function pointers for implementing the traversal. That way, there * could be one core load routine for each of the three required algorithms * (buffer, seg, and mlist). That would also mean that the traversal * algorithm would then only need one implementation for each algorithm * instead of two (one for populating the iomap and one for populating * the dvma map). */ int iommu_dvmamap_load_raw(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, bus_size_t size, int flags) { int i, s; int left; int err = 0; bus_size_t sgsize; bus_size_t boundary, align; u_long dvmaddr, sgstart, sgend; struct iommu_state *is; struct iommu_map_state *ims = map->_dm_cookie; #ifdef DIAGNOSTIC if (ims == NULL) panic("iommu_dvmamap_load_raw: null map state"); #endif #ifdef DEBUG if (ims->ims_sb == NULL) panic("iommu_dvmamap_load_raw: null sb"); if (ims->ims_sb->sb_iommu == NULL) panic("iommu_dvmamap_load_raw: null iommu"); #endif /* DEBUG */ is = ims->ims_sb->sb_iommu; if (map->dm_nsegs) { /* Already in use?? */ #ifdef DIAGNOSTIC panic("iommu_dvmamap_load_raw: map still in use"); #endif bus_dmamap_unload(t0, map); } /* * A boundary presented to bus_dmamem_alloc() takes precedence * over boundary in the map. */ if ((boundary = segs[0]._ds_boundary) == 0) boundary = map->_dm_boundary; align = MAX(segs[0]._ds_align, PAGE_SIZE); /* * Make sure that on error condition we return "no valid mappings". */ map->dm_nsegs = 0; iommu_iomap_clear_pages(ims); if (segs[0]._ds_mlist) { struct pglist *mlist = segs[0]._ds_mlist; struct vm_page *m; for (m = TAILQ_FIRST(mlist); m != NULL; m = TAILQ_NEXT(m,pageq)) { err = iommu_iomap_insert_page(ims, VM_PAGE_TO_PHYS(m)); if(err) { printf("iomap insert error: %d for " "pa 0x%lx\n", err, VM_PAGE_TO_PHYS(m)); iommu_dvmamap_print_map(t, is, map); iommu_iomap_clear_pages(ims); return (EFBIG); } } } else { /* Count up the total number of pages we need */ for (i = 0, left = size; left > 0 && i < nsegs; i++) { bus_addr_t a, aend; bus_size_t len = segs[i].ds_len; bus_addr_t addr = segs[i].ds_addr; int seg_len = MIN(left, len); if (len < 1) continue; aend = round_page(addr + seg_len); for (a = trunc_page(addr); a < aend; a += PAGE_SIZE) { err = iommu_iomap_insert_page(ims, a); if (err) { printf("iomap insert error: %d for " "pa 0x%llx\n", err, a); iommu_dvmamap_print_map(t, is, map); iommu_iomap_clear_pages(ims); return (EFBIG); } } left -= seg_len; } } sgsize = ims->ims_map.ipm_pagecnt * PAGE_SIZE; if (flags & BUS_DMA_24BIT) { sgstart = MAX(is->is_dvmamap->ex_start, 0xff000000); sgend = MIN(is->is_dvmamap->ex_end, 0xffffffff); } else { sgstart = is->is_dvmamap->ex_start; sgend = is->is_dvmamap->ex_end; } /* * If our segment size is larger than the boundary we need to * split the transfer up into little pieces ourselves. */ s = splhigh(); err = extent_alloc_subregion(is->is_dvmamap, sgstart, sgend, sgsize, align, 0, (sgsize > boundary) ? 0 : boundary, EX_NOWAIT | EX_BOUNDZERO, (u_long *)&dvmaddr); splx(s); if (err != 0) return (err); #ifdef DEBUG if (dvmaddr == (bus_addr_t)-1) { printf("iommu_dvmamap_load_raw(): extent_alloc(%d, %x) " "failed!\n", (int)sgsize, flags); #ifdef DDB if (iommudebug & IDB_BREAK) Debugger(); #else panic(""); #endif } #endif if (dvmaddr == (bus_addr_t)-1) return (ENOMEM); /* Set the active DVMA map */ map->_dm_dvmastart = dvmaddr; map->_dm_dvmasize = sgsize; map->dm_mapsize = size; #ifdef DEBUG iommu_dvmamap_validate_map(t, is, map); #endif if (iommu_iomap_load_map(is, ims, dvmaddr, flags)) return (EFBIG); if (segs[0]._ds_mlist) err = iommu_dvmamap_load_mlist(t, is, map, segs[0]._ds_mlist, flags, size, boundary); else err = iommu_dvmamap_load_seg(t, is, map, segs, nsegs, flags, size, boundary); if (err) iommu_iomap_unload_map(is, ims); #ifdef DIAGNOSTIC /* The map should be valid even if the load failed */ if (iommu_dvmamap_validate_map(t, is, map)) { printf("load size %lld/0x%llx\n", size, size); if (segs[0]._ds_mlist) printf("mlist %p\n", segs[0]._ds_mlist); else { long tot_len = 0; long clip_len = 0; printf("segs %p nsegs %d\n", segs, nsegs); left = size; for(i = 0; i < nsegs; i++) { bus_size_t len = segs[i].ds_len; bus_addr_t addr = segs[i].ds_addr; int seg_len = MIN(left, len); printf("addr %llx len %lld/0x%llx seg_len " "%d/0x%x left %d/0x%x\n", addr, len, len, seg_len, seg_len, left, left); left -= seg_len; clip_len += seg_len; tot_len += segs[i].ds_len; } printf("total length %ld/0x%lx total seg. " "length %ld/0x%lx\n", tot_len, tot_len, clip_len, clip_len); } if (err == 0) err = 1; } #endif #ifdef DEBUG if (err) printf("**** iommu_dvmamap_load_raw failed with error %d\n", err); if (err || (iommudebug & IDB_PRINT_MAP)) { iommu_dvmamap_print_map(t, is, map); #ifdef DDB if (iommudebug & IDB_BREAK) Debugger(); #endif } #endif return (err); } /* * Insert a range of addresses into a loaded map respecting the specified * boundary and alignment restrictions. The range is specified by its * physical address and length. The range cannot cross a page boundary. * This code (along with most of the rest of the function in this file) * assumes that the IOMMU page size is equal to PAGE_SIZE. */ int iommu_dvmamap_append_range(bus_dma_tag_t t, bus_dmamap_t map, paddr_t pa, bus_size_t length, int flags, bus_size_t boundary) { struct iommu_map_state *ims = map->_dm_cookie; bus_addr_t sgstart, sgend, bd_mask; bus_dma_segment_t *seg = NULL; int i = map->dm_nsegs; #ifdef DEBUG if (ims == NULL) panic("iommu_dvmamap_append_range: null map state"); #endif sgstart = iommu_iomap_translate(ims, pa); sgend = sgstart + length - 1; #ifdef DIAGNOSTIC if (sgstart == NULL || sgstart > sgend) { printf("append range invalid mapping for %lx " "(0x%llx - 0x%llx)\n", pa, sgstart, sgend); map->dm_nsegs = 0; return (EINVAL); } #endif #ifdef DEBUG if (trunc_page(sgstart) != trunc_page(sgend)) { printf("append range crossing page boundary! " "pa %lx length %lld/0x%llx sgstart %llx sgend %llx\n", pa, length, length, sgstart, sgend); } #endif /* * We will attempt to merge this range with the previous entry * (if there is one). */ if (i > 0) { seg = &map->dm_segs[i - 1]; if (sgstart == seg->ds_addr + seg->ds_len) { length += seg->ds_len; sgstart = seg->ds_addr; sgend = sgstart + length - 1; } else seg = NULL; } if (seg == NULL) { seg = &map->dm_segs[i]; if (++i > map->_dm_segcnt) { map->dm_nsegs = 0; return (EFBIG); } } /* * At this point, "i" is the index of the *next* bus_dma_segment_t * (the segment count, aka map->dm_nsegs) and "seg" points to the * *current* entry. "length", "sgstart", and "sgend" reflect what * we intend to put in "*seg". No assumptions should be made about * the contents of "*seg". Only "boundary" issue can change this * and "boundary" is often zero, so explicitly test for that case * (the test is strictly an optimization). */ if (boundary != 0) { bd_mask = ~(boundary - 1); while ((sgstart & bd_mask) != (sgend & bd_mask)) { /* * We are crossing a boundary so fill in the current * segment with as much as possible, then grab a new * one. */ seg->ds_addr = sgstart; seg->ds_len = boundary - (sgstart & bd_mask); sgstart += seg->ds_len; /* sgend stays the same */ length -= seg->ds_len; seg = &map->dm_segs[i]; if (++i > map->_dm_segcnt) { map->dm_nsegs = 0; return (EFBIG); } } } seg->ds_addr = sgstart; seg->ds_len = length; map->dm_nsegs = i; return (0); } /* * Populate the iomap from a bus_dma_segment_t array. See note for * iommu_dvmamap_load() * regarding page entry exhaustion of the iomap. * This is less of a problem for load_seg, as the number of pages * is usually similar to the number of segments (nsegs). */ int iommu_dvmamap_load_seg(bus_dma_tag_t t, struct iommu_state *is, bus_dmamap_t map, bus_dma_segment_t *segs, int nsegs, int flags, bus_size_t size, bus_size_t boundary) { int i; int left; int seg; /* * This segs is made up of individual physical * segments, probably by _bus_dmamap_load_uio() or * _bus_dmamap_load_mbuf(). Ignore the mlist and * load each one individually. */ /* * Keep in mind that each segment could span * multiple pages and that these are not always * adjacent. The code is no longer adding dvma * aliases to the IOMMU. The STC will not cross * page boundaries anyway and a IOMMU table walk * vs. what may be a streamed PCI DMA to a ring * descriptor is probably a wash. It eases TLB * pressure and in the worst possible case, it is * only as bad a non-IOMMUed architecture. More * importantly, the code is not quite as hairy. * (It's bad enough as it is.) */ left = size; seg = 0; for (i = 0; left > 0 && i < nsegs; i++) { bus_addr_t a, aend; bus_size_t len = segs[i].ds_len; bus_addr_t addr = segs[i].ds_addr; int seg_len = MIN(left, len); if (len < 1) continue; aend = round_page(addr + seg_len); for (a = trunc_page(addr); a < aend; a += PAGE_SIZE) { bus_addr_t pgstart; bus_addr_t pgend; int pglen; int err; pgstart = MAX(a, addr); pgend = MIN(a + PAGE_SIZE - 1, addr + seg_len - 1); pglen = pgend - pgstart + 1; if (pglen < 1) continue; err = iommu_dvmamap_append_range(t, map, pgstart, pglen, flags, boundary); if (err == EFBIG) return (err); if (err) { printf("iomap load seg page: %d for " "pa 0x%llx (%llx - %llx for %d/%x\n", err, a, pgstart, pgend, pglen, pglen); return (err); } } left -= seg_len; } return (0); } /* * Populate the iomap from an mlist. See note for iommu_dvmamap_load() * regarding page entry exhaustion of the iomap. */ int iommu_dvmamap_load_mlist(bus_dma_tag_t t, struct iommu_state *is, bus_dmamap_t map, struct pglist *mlist, int flags, bus_size_t size, bus_size_t boundary) { struct vm_page *m; paddr_t pa; int err; /* * This was allocated with bus_dmamem_alloc. * The pages are on an `mlist'. */ for (m = TAILQ_FIRST(mlist); m != NULL; m = TAILQ_NEXT(m,pageq)) { pa = VM_PAGE_TO_PHYS(m); err = iommu_dvmamap_append_range(t, map, pa, PAGE_SIZE, flags, boundary); if (err == EFBIG) return (err); if (err) { printf("iomap load seg page: %d for pa 0x%lx " "(%lx - %lx for %d/%x\n", err, pa, pa, pa + PAGE_SIZE, PAGE_SIZE, PAGE_SIZE); return (err); } } return (0); } /* * Unload a dvmamap. */ void iommu_dvmamap_unload(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map) { struct iommu_state *is; struct iommu_map_state *ims = map->_dm_cookie; bus_addr_t dvmaddr = map->_dm_dvmastart; bus_size_t sgsize = map->_dm_dvmasize; int error, s; #ifdef DEBUG if (ims == NULL) panic("iommu_dvmamap_unload: null map state"); if (ims->ims_sb == NULL) panic("iommu_dvmamap_unload: null sb"); if (ims->ims_sb->sb_iommu == NULL) panic("iommu_dvmamap_unload: null iommu"); #endif /* DEBUG */ is = ims->ims_sb->sb_iommu; /* Flush the iommu */ #ifdef DEBUG if (dvmaddr == 0) { printf("iommu_dvmamap_unload: No dvmastart\n"); #ifdef DDB if (iommudebug & IDB_BREAK) Debugger(); #endif return; } iommu_dvmamap_validate_map(t, is, map); if (iommudebug & IDB_PRINT_MAP) iommu_dvmamap_print_map(t, is, map); #endif /* DEBUG */ /* Remove the IOMMU entries */ iommu_iomap_unload_map(is, ims); /* Clear the iomap */ iommu_iomap_clear_pages(ims); bus_dmamap_unload(t->_parent, map); /* Mark the mappings as invalid. */ map->dm_mapsize = 0; map->dm_nsegs = 0; s = splhigh(); error = extent_free(is->is_dvmamap, dvmaddr, sgsize, EX_NOWAIT); map->_dm_dvmastart = 0; map->_dm_dvmasize = 0; splx(s); if (error != 0) printf("warning: %qd of DVMA space lost\n", sgsize); } /* * Perform internal consistency checking on a dvmamap. */ int iommu_dvmamap_validate_map(bus_dma_tag_t t, struct iommu_state *is, bus_dmamap_t map) { int err = 0; int seg; if (trunc_page(map->_dm_dvmastart) != map->_dm_dvmastart) { printf("**** dvmastart address not page aligned: %llx", map->_dm_dvmastart); err = 1; } if (trunc_page(map->_dm_dvmasize) != map->_dm_dvmasize) { printf("**** dvmasize not a multiple of page size: %llx", map->_dm_dvmasize); err = 1; } if (map->_dm_dvmastart < is->is_dvmabase || (round_page(map->_dm_dvmastart + map->_dm_dvmasize) - 1) > is->is_dvmaend) { printf("dvmaddr %llx len %llx out of range %x - %x\n", map->_dm_dvmastart, map->_dm_dvmasize, is->is_dvmabase, is->is_dvmaend); err = 1; } for (seg = 0; seg < map->dm_nsegs; seg++) { if (map->dm_segs[seg].ds_addr == 0 || map->dm_segs[seg].ds_len == 0) { printf("seg %d null segment dvmaddr %llx len %llx for " "range %llx len %llx\n", seg, map->dm_segs[seg].ds_addr, map->dm_segs[seg].ds_len, map->_dm_dvmastart, map->_dm_dvmasize); err = 1; } else if (map->dm_segs[seg].ds_addr < map->_dm_dvmastart || round_page(map->dm_segs[seg].ds_addr + map->dm_segs[seg].ds_len) > map->_dm_dvmastart + map->_dm_dvmasize) { printf("seg %d dvmaddr %llx len %llx out of " "range %llx len %llx\n", seg, map->dm_segs[seg].ds_addr, map->dm_segs[seg].ds_len, map->_dm_dvmastart, map->_dm_dvmasize); err = 1; } } if (err) { iommu_dvmamap_print_map(t, is, map); #if defined(DDB) && defined(DEBUG) if (iommudebug & IDB_BREAK) Debugger(); #endif } return (err); } void iommu_dvmamap_print_map(bus_dma_tag_t t, struct iommu_state *is, bus_dmamap_t map) { int seg, i; long full_len, source_len; struct mbuf *m; printf("DVMA %x for %x, mapping %p: dvstart %llx dvsize %llx " "size %lld/%llx maxsegsz %llx boundary %llx segcnt %d " "flags %x type %d source %p " "cookie %p mapsize %llx nsegs %d\n", is ? is->is_dvmabase : 0, is ? is->is_dvmaend : 0, map, map->_dm_dvmastart, map->_dm_dvmasize, map->_dm_size, map->_dm_size, map->_dm_maxsegsz, map->_dm_boundary, map->_dm_segcnt, map->_dm_flags, map->_dm_type, map->_dm_source, map->_dm_cookie, map->dm_mapsize, map->dm_nsegs); full_len = 0; for (seg = 0; seg < map->dm_nsegs; seg++) { printf("seg %d dvmaddr %llx pa %lx len %llx (tte %llx)\n", seg, map->dm_segs[seg].ds_addr, is ? iommu_extract(is, map->dm_segs[seg].ds_addr) : 0, map->dm_segs[seg].ds_len, is ? iommu_lookup_tte(is, map->dm_segs[seg].ds_addr) : 0); full_len += map->dm_segs[seg].ds_len; } printf("total length = %ld/0x%lx\n", full_len, full_len); if (map->_dm_source) switch (map->_dm_type) { case _DM_TYPE_MBUF: m = map->_dm_source; if (m->m_flags & M_PKTHDR) printf("source PKTHDR mbuf (%p) hdr len = %d/0x%x:\n", m, m->m_pkthdr.len, m->m_pkthdr.len); else printf("source mbuf (%p):\n", m); source_len = 0; for ( ; m; m = m->m_next) { vaddr_t vaddr = mtod(m, vaddr_t); long len = m->m_len; paddr_t pa; if (pmap_extract(pmap_kernel(), vaddr, &pa)) printf("kva %lx pa %lx len %ld/0x%lx\n", vaddr, pa, len, len); else printf("kva %lx pa len %ld/0x%lx\n", vaddr, len, len); source_len += len; } if (full_len != source_len) printf("mbuf length %ld/0x%lx is %s than mapping " "length %ld/0x%lx\n", source_len, source_len, (source_len > full_len) ? "greater" : "less", full_len, full_len); else printf("mbuf length %ld/0x%lx\n", source_len, source_len); break; case _DM_TYPE_LOAD: case _DM_TYPE_SEGS: case _DM_TYPE_UIO: default: break; } if (map->_dm_cookie) { struct iommu_map_state *ims = map->_dm_cookie; struct iommu_page_map *ipm = &ims->ims_map; printf("page map (%p) of size %d with %d entries\n", ipm, ipm->ipm_maxpage, ipm->ipm_pagecnt); for (i = 0; i < ipm->ipm_pagecnt; ++i) { struct iommu_page_entry *e = &ipm->ipm_map[i]; printf("%d: vmaddr 0x%lx pa 0x%lx\n", i, e->ipe_va, e->ipe_pa); } } else printf("iommu map state (cookie) is NULL\n"); } void _iommu_dvmamap_sync(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops) { struct iommu_state *is; struct iommu_map_state *ims = map->_dm_cookie; struct strbuf_ctl *sb; bus_size_t count; int i, needsflush = 0; sb = ims->ims_sb; is = sb->sb_iommu; for (i = 0; i < map->dm_nsegs; i++) { if (offset < map->dm_segs[i].ds_len) break; offset -= map->dm_segs[i].ds_len; } if (i == map->dm_nsegs) panic("iommu_dvmamap_sync: too short %llu", offset); for (; len > 0 && i < map->dm_nsegs; i++) { count = MIN(map->dm_segs[i].ds_len - offset, len); if (count > 0 && iommu_dvmamap_sync_range(sb, map->dm_segs[i].ds_addr + offset, count)) needsflush = 1; len -= count; } #ifdef DIAGNOSTIC if (i == map->dm_nsegs && len > 0) panic("iommu_dvmamap_sync: leftover %llu", len); #endif if (needsflush) iommu_strbuf_flush_done(ims); } void iommu_dvmamap_sync(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops) { struct iommu_map_state *ims = map->_dm_cookie; #ifdef DIAGNOSTIC if (ims == NULL) panic("iommu_dvmamap_sync: null map state"); if (ims->ims_sb == NULL) panic("iommu_dvmamap_sync: null sb"); if (ims->ims_sb->sb_iommu == NULL) panic("iommu_dvmamap_sync: null iommu"); #endif if (len == 0) return; if (ops & BUS_DMASYNC_PREWRITE) membar(MemIssue); if ((ims->ims_flags & IOMMU_MAP_STREAM) && (ops & (BUS_DMASYNC_POSTREAD | BUS_DMASYNC_PREWRITE))) _iommu_dvmamap_sync(t, t0, map, offset, len, ops); if (ops & BUS_DMASYNC_POSTREAD) membar(MemIssue); } /* * Flush an individual dma segment, returns non-zero if the streaming buffers * need flushing afterwards. */ int iommu_dvmamap_sync_range(struct strbuf_ctl *sb, vaddr_t va, bus_size_t len) { vaddr_t vaend; #ifdef DIAGNOSTIC struct iommu_state *is = sb->sb_iommu; if (va < is->is_dvmabase || va > is->is_dvmaend) panic("invalid va: %llx", (long long)va); if ((is->is_tsb[IOTSBSLOT(va, is->is_tsbsize)] & IOTTE_STREAM) == 0) { printf("iommu_dvmamap_sync_range: attempting to flush " "non-streaming entry\n"); return (0); } #endif vaend = (va + len + PAGE_MASK) & ~PAGE_MASK; va &= ~PAGE_MASK; #ifdef DIAGNOSTIC if (va < is->is_dvmabase || (vaend - 1) > is->is_dvmaend) panic("invalid va range: %llx to %llx (%x to %x)", (long long)va, (long long)vaend, is->is_dvmabase, is->is_dvmaend); #endif for ( ; va <= vaend; va += PAGE_SIZE) { DPRINTF(IDB_BUSDMA, ("iommu_dvmamap_sync_range: flushing va %p\n", (void *)(u_long)va)); iommu_strbuf_flush(sb, va); } return (1); } int iommu_dvmamem_alloc(bus_dma_tag_t t, bus_dma_tag_t t0, bus_size_t size, bus_size_t alignment, bus_size_t boundary, bus_dma_segment_t *segs, int nsegs, int *rsegs, int flags) { DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_alloc: sz %llx align %llx " "bound %llx segp %p flags %d\n", (unsigned long long)size, (unsigned long long)alignment, (unsigned long long)boundary, segs, flags)); BUS_DMA_FIND_PARENT(t, _dmamem_alloc); return ((*t->_dmamem_alloc)(t, t0, size, alignment, boundary, segs, nsegs, rsegs, flags | BUS_DMA_DVMA)); } void iommu_dvmamem_free(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dma_segment_t *segs, int nsegs) { DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_free: segp %p nsegs %d\n", segs, nsegs)); BUS_DMA_FIND_PARENT(t, _dmamem_free); (*t->_dmamem_free)(t, t0, segs, nsegs); } /* * Map the DVMA mappings into the kernel pmap. * Check the flags to see whether we're streaming or coherent. */ int iommu_dvmamem_map(bus_dma_tag_t t, bus_dma_tag_t t0, bus_dma_segment_t *segs, int nsegs, size_t size, caddr_t *kvap, int flags) { struct vm_page *m; vaddr_t va; bus_addr_t addr; struct pglist *mlist; bus_addr_t cbit = 0; DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_map: segp %p nsegs %d size %lx\n", segs, nsegs, size)); /* * Allocate some space in the kernel map, and then map these pages * into this space. */ size = round_page(size); va = uvm_km_valloc(kernel_map, size); if (va == 0) return (ENOMEM); *kvap = (caddr_t)va; /* * digest flags: */ #if 0 if (flags & BUS_DMA_COHERENT) /* Disable vcache */ cbit |= PMAP_NVC; #endif if (flags & BUS_DMA_NOCACHE) /* sideffects */ cbit |= PMAP_NC; /* * Now take this and map it into the CPU. */ mlist = segs[0]._ds_mlist; TAILQ_FOREACH(m, mlist, pageq) { #ifdef DIAGNOSTIC if (size == 0) panic("iommu_dvmamem_map: size botch"); #endif addr = VM_PAGE_TO_PHYS(m); DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_map: " "mapping va %lx at %llx\n", va, (unsigned long long)addr | cbit)); pmap_enter(pmap_kernel(), va, addr | cbit, VM_PROT_READ | VM_PROT_WRITE, VM_PROT_READ | VM_PROT_WRITE | PMAP_WIRED); va += PAGE_SIZE; size -= PAGE_SIZE; } pmap_update(pmap_kernel()); return (0); } /* * Unmap DVMA mappings from kernel */ void iommu_dvmamem_unmap(bus_dma_tag_t t, bus_dma_tag_t t0, caddr_t kva, size_t size) { DPRINTF(IDB_BUSDMA, ("iommu_dvmamem_unmap: kvm %p size %lx\n", kva, size)); #ifdef DIAGNOSTIC if ((u_long)kva & PAGE_MASK) panic("iommu_dvmamem_unmap"); #endif size = round_page(size); pmap_remove(pmap_kernel(), (vaddr_t)kva, size); pmap_update(pmap_kernel()); uvm_km_free(kernel_map, (vaddr_t)kva, size); } /* * Create a new iomap. */ struct iommu_map_state * iommu_iomap_create(int n) { struct iommu_map_state *ims; struct strbuf_flush *sbf; vaddr_t va; /* Safety for heavily fragmented data, such as mbufs */ n += 4; if (n < 16) n = 16; ims = malloc(sizeof(*ims) + (n - 1) * sizeof(ims->ims_map.ipm_map[0]), M_DEVBUF, M_NOWAIT); if (ims == NULL) return (NULL); memset(ims, 0, sizeof *ims); /* Initialize the map. */ ims->ims_map.ipm_maxpage = n; SPLAY_INIT(&ims->ims_map.ipm_tree); /* Initialize the flush area. */ sbf = &ims->ims_flush; va = (vaddr_t)&sbf->sbf_area[0x40]; va &= ~0x3f; pmap_extract(pmap_kernel(), va, &sbf->sbf_flushpa); sbf->sbf_flush = (void *)va; return (ims); } /* * Destroy an iomap. */ void iommu_iomap_destroy(struct iommu_map_state *ims) { #ifdef DIAGNOSTIC if (ims->ims_map.ipm_pagecnt > 0) printf("iommu_iomap_destroy: %d page entries in use\n", ims->ims_map.ipm_pagecnt); #endif free(ims, M_DEVBUF); } /* * Utility function used by splay tree to order page entries by pa. */ static inline int iomap_compare(struct iommu_page_entry *a, struct iommu_page_entry *b) { return ((a->ipe_pa > b->ipe_pa) ? 1 : (a->ipe_pa < b->ipe_pa) ? -1 : 0); } SPLAY_PROTOTYPE(iommu_page_tree, iommu_page_entry, ipe_node, iomap_compare); SPLAY_GENERATE(iommu_page_tree, iommu_page_entry, ipe_node, iomap_compare); /* * Insert a pa entry in the iomap. */ int iommu_iomap_insert_page(struct iommu_map_state *ims, paddr_t pa) { struct iommu_page_map *ipm = &ims->ims_map; struct iommu_page_entry *e; if (ipm->ipm_pagecnt >= ipm->ipm_maxpage) { struct iommu_page_entry ipe; ipe.ipe_pa = pa; if (SPLAY_FIND(iommu_page_tree, &ipm->ipm_tree, &ipe)) return (0); return (ENOMEM); } e = &ipm->ipm_map[ipm->ipm_pagecnt]; e->ipe_pa = pa; e->ipe_va = NULL; e = SPLAY_INSERT(iommu_page_tree, &ipm->ipm_tree, e); /* Duplicates are okay, but only count them once. */ if (e) return (0); ++ipm->ipm_pagecnt; return (0); } /* * Locate the iomap by filling in the pa->va mapping and inserting it * into the IOMMU tables. */ int iommu_iomap_load_map(struct iommu_state *is, struct iommu_map_state *ims, vaddr_t vmaddr, int flags) { struct iommu_page_map *ipm = &ims->ims_map; struct iommu_page_entry *e; struct strbuf_ctl *sb = ims->ims_sb; int i; if (sb->sb_flush == NULL) flags &= ~BUS_DMA_STREAMING; if (flags & BUS_DMA_STREAMING) ims->ims_flags |= IOMMU_MAP_STREAM; else ims->ims_flags &= ~IOMMU_MAP_STREAM; for (i = 0, e = ipm->ipm_map; i < ipm->ipm_pagecnt; ++i, ++e) { e->ipe_va = vmaddr; iommu_enter(is, sb, e->ipe_va, e->ipe_pa, flags); vmaddr += PAGE_SIZE; } return (0); } /* * Remove the iomap from the IOMMU. */ int iommu_iomap_unload_map(struct iommu_state *is, struct iommu_map_state *ims) { struct iommu_page_map *ipm = &ims->ims_map; struct iommu_page_entry *e; struct strbuf_ctl *sb = ims->ims_sb; int i; for (i = 0, e = ipm->ipm_map; i < ipm->ipm_pagecnt; ++i, ++e) iommu_remove(is, sb, e->ipe_va); return (0); } /* * Translate a physical address (pa) into a DVMA address. */ vaddr_t iommu_iomap_translate(struct iommu_map_state *ims, paddr_t pa) { struct iommu_page_map *ipm = &ims->ims_map; struct iommu_page_entry *e; struct iommu_page_entry pe; paddr_t offset = pa & PAGE_MASK; pe.ipe_pa = trunc_page(pa); e = SPLAY_FIND(iommu_page_tree, &ipm->ipm_tree, &pe); if (e == NULL) return (NULL); return (e->ipe_va | offset); } /* * Clear the iomap table and tree. */ void iommu_iomap_clear_pages(struct iommu_map_state *ims) { ims->ims_map.ipm_pagecnt = 0; SPLAY_INIT(&ims->ims_map.ipm_tree); }