| 1 | /* $NetBSD: intel_gtt.c,v 1.5 2015/03/06 22:03:06 riastradh Exp $ */ |
| 2 | |
| 3 | /*- |
| 4 | * Copyright (c) 2014 The NetBSD Foundation, Inc. |
| 5 | * All rights reserved. |
| 6 | * |
| 7 | * This code is derived from software contributed to The NetBSD Foundation |
| 8 | * by Taylor R. Campbell. |
| 9 | * |
| 10 | * Redistribution and use in source and binary forms, with or without |
| 11 | * modification, are permitted provided that the following conditions |
| 12 | * are met: |
| 13 | * 1. Redistributions of source code must retain the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer. |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in the |
| 17 | * documentation and/or other materials provided with the distribution. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 20 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 21 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 23 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 24 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 25 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 26 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 27 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 28 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 29 | * POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* Intel GTT stubs */ |
| 33 | |
| 34 | #include <sys/cdefs.h> |
| 35 | __KERNEL_RCSID(0, "$NetBSD: intel_gtt.c,v 1.5 2015/03/06 22:03:06 riastradh Exp $" ); |
| 36 | |
| 37 | #include <sys/types.h> |
| 38 | #include <sys/bus.h> |
| 39 | #include <sys/errno.h> |
| 40 | #include <sys/systm.h> |
| 41 | |
| 42 | #include <machine/vmparam.h> |
| 43 | |
| 44 | #include <dev/pci/pcivar.h> /* XXX agpvar.h needs... */ |
| 45 | #include <dev/pci/agpvar.h> |
| 46 | #include <dev/pci/agp_i810var.h> |
| 47 | |
| 48 | #include "drm/intel-gtt.h" |
| 49 | |
| 50 | /* Access to this should be single-threaded. */ |
| 51 | static struct { |
| 52 | bus_dma_segment_t scratch_seg; |
| 53 | bus_dmamap_t scratch_map; |
| 54 | } intel_gtt; |
| 55 | |
| 56 | void |
| 57 | intel_gtt_get(size_t *va_size, size_t *stolen_size, bus_addr_t *aper_base, |
| 58 | unsigned long *aper_size) |
| 59 | { |
| 60 | struct agp_softc *const sc = agp_i810_sc; |
| 61 | |
| 62 | if (sc == NULL) { |
| 63 | *va_size = 0; |
| 64 | *stolen_size = 0; |
| 65 | *aper_base = 0; |
| 66 | *aper_size = 0; |
| 67 | return; |
| 68 | } |
| 69 | |
| 70 | struct agp_i810_softc *const isc = sc->as_chipc; |
| 71 | *va_size = ((size_t)(isc->gtt_size/sizeof(uint32_t)) << PAGE_SHIFT); |
| 72 | *stolen_size = ((size_t)isc->stolen << PAGE_SHIFT); |
| 73 | *aper_base = sc->as_apaddr; |
| 74 | *aper_size = sc->as_apsize; |
| 75 | } |
| 76 | |
| 77 | int |
| 78 | intel_gmch_probe(struct pci_dev *bridge_pci __unused, |
| 79 | struct pci_dev *gpu __unused, struct agp_bridge_data *bridge_agp __unused) |
| 80 | { |
| 81 | struct agp_softc *const sc = agp_i810_sc; |
| 82 | int nsegs; |
| 83 | int error; |
| 84 | |
| 85 | if (sc == NULL) |
| 86 | return 0; |
| 87 | |
| 88 | error = bus_dmamem_alloc(sc->as_dmat, PAGE_SIZE, PAGE_SIZE, 0, |
| 89 | &intel_gtt.scratch_seg, 1, &nsegs, BUS_DMA_WAITOK); |
| 90 | if (error) |
| 91 | goto fail0; |
| 92 | KASSERT(nsegs == 1); |
| 93 | |
| 94 | error = bus_dmamap_create(sc->as_dmat, PAGE_SIZE, 1, PAGE_SIZE, 0, |
| 95 | BUS_DMA_WAITOK, &intel_gtt.scratch_map); |
| 96 | if (error) |
| 97 | goto fail1; |
| 98 | |
| 99 | error = bus_dmamap_load_raw(sc->as_dmat, intel_gtt.scratch_map, |
| 100 | &intel_gtt.scratch_seg, 1, PAGE_SIZE, BUS_DMA_WAITOK); |
| 101 | if (error) |
| 102 | goto fail2; |
| 103 | |
| 104 | /* Success! */ |
| 105 | return 1; |
| 106 | |
| 107 | fail3: __unused |
| 108 | bus_dmamap_unload(sc->as_dmat, intel_gtt.scratch_map); |
| 109 | fail2: bus_dmamap_destroy(sc->as_dmat, intel_gtt.scratch_map); |
| 110 | fail1: bus_dmamem_free(sc->as_dmat, &intel_gtt.scratch_seg, 1); |
| 111 | fail0: KASSERT(error); |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | void |
| 116 | intel_gmch_remove(void) |
| 117 | { |
| 118 | struct agp_softc *const sc = agp_i810_sc; |
| 119 | |
| 120 | bus_dmamap_unload(sc->as_dmat, intel_gtt.scratch_map); |
| 121 | bus_dmamap_destroy(sc->as_dmat, intel_gtt.scratch_map); |
| 122 | bus_dmamem_free(sc->as_dmat, &intel_gtt.scratch_seg, 1); |
| 123 | } |
| 124 | |
| 125 | bool |
| 126 | intel_enable_gtt(void) |
| 127 | { |
| 128 | |
| 129 | return (agp_i810_sc != NULL); |
| 130 | } |
| 131 | |
| 132 | void |
| 133 | intel_gtt_chipset_flush(void) |
| 134 | { |
| 135 | |
| 136 | KASSERT(agp_i810_sc != NULL); |
| 137 | agp_i810_chipset_flush(agp_i810_sc->as_chipc); |
| 138 | } |
| 139 | |
| 140 | void |
| 141 | intel_gtt_insert_entries(bus_dmamap_t dmamap, unsigned va_page, unsigned flags) |
| 142 | { |
| 143 | struct agp_i810_softc *const isc = agp_i810_sc->as_chipc; |
| 144 | off_t va = (va_page << PAGE_SHIFT); |
| 145 | unsigned seg; |
| 146 | int gtt_flags = 0; |
| 147 | int error; |
| 148 | |
| 149 | KASSERT(0 <= va); |
| 150 | KASSERT((va >> PAGE_SHIFT) == va_page); |
| 151 | KASSERT(0 < dmamap->dm_nsegs); |
| 152 | |
| 153 | gtt_flags |= AGP_I810_GTT_VALID; |
| 154 | switch (flags) { |
| 155 | case AGP_USER_MEMORY: |
| 156 | break; |
| 157 | case AGP_USER_CACHED_MEMORY: |
| 158 | gtt_flags |= AGP_I810_GTT_CACHED; |
| 159 | break; |
| 160 | default: |
| 161 | panic("invalid intel gtt flags: %x" , flags); |
| 162 | } |
| 163 | |
| 164 | for (seg = 0; seg < dmamap->dm_nsegs; seg++) { |
| 165 | const bus_addr_t addr = dmamap->dm_segs[seg].ds_addr; |
| 166 | |
| 167 | KASSERT(dmamap->dm_segs[seg].ds_len == PAGE_SIZE); |
| 168 | |
| 169 | /* XXX Respect flags. */ |
| 170 | error = agp_i810_write_gtt_entry(isc, va, addr, gtt_flags); |
| 171 | if (error) |
| 172 | device_printf(agp_i810_sc->as_dev, |
| 173 | "write gtt entry" |
| 174 | " %" PRIxMAX" -> %" PRIxMAX" failed: %d\n" , |
| 175 | (uintmax_t)va, (uintmax_t)(addr | 1), error); |
| 176 | va += PAGE_SIZE; |
| 177 | } |
| 178 | agp_i810_post_gtt_entry(isc, (va - PAGE_SIZE)); |
| 179 | } |
| 180 | |
| 181 | void |
| 182 | intel_gtt_clear_range(unsigned va_page, unsigned npages) |
| 183 | { |
| 184 | struct agp_i810_softc *const isc = agp_i810_sc->as_chipc; |
| 185 | const bus_addr_t addr = intel_gtt.scratch_map->dm_segs[0].ds_addr; |
| 186 | const int gtt_flags = AGP_I810_GTT_VALID; |
| 187 | off_t va = (va_page << PAGE_SHIFT); |
| 188 | |
| 189 | KASSERT(0 <= va); |
| 190 | KASSERT((va >> PAGE_SHIFT) == va_page); |
| 191 | KASSERT(0 < npages); |
| 192 | |
| 193 | while (npages--) { |
| 194 | agp_i810_write_gtt_entry(isc, va, addr, gtt_flags); |
| 195 | va += PAGE_SIZE; |
| 196 | } |
| 197 | agp_i810_post_gtt_entry(isc, va - PAGE_SIZE); |
| 198 | } |
| 199 | |