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ttm_agp_backend.c revision 1.3.2.2 
      1 /*	$NetBSD: ttm_agp_backend.c,v 1.3.2.2 2014/08/20 00:04:22 tls 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 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: ttm_agp_backend.c,v 1.3.2.2 2014/08/20 00:04:22 tls Exp $");
     34 
     35 #include <sys/types.h>
     36 #include <sys/kmem.h>
     37 
     38 #include <dev/pci/pcireg.h>
     39 #include <dev/pci/pcivar.h>
     40 #include <dev/pci/agpvar.h>
     41 
     42 #include <ttm/ttm_bo_driver.h>
     43 #include <ttm/ttm_page_alloc.h>
     44 
     45 struct ttm_agp {
     46 	struct ttm_dma_tt ttm_dma;
     47 	struct agp_softc *agp;
     48 	unsigned long agp_pgno;
     49 	bool bound;
     50 };
     51 
     52 static const struct ttm_backend_func ttm_agp_backend_func;
     53 
     54 struct ttm_tt *
     55 ttm_agp_tt_create(struct ttm_bo_device *bdev, struct agp_bridge_data *bridge,
     56     unsigned long size, uint32_t page_flags, struct page *dummy_read_page)
     57 {
     58 	struct ttm_agp *ttm_agp;
     59 
     60 	ttm_agp = kmem_alloc(sizeof(*ttm_agp), KM_SLEEP);
     61 	ttm_agp->agp = &bridge->abd_sc;
     62 	ttm_agp->ttm_dma.ttm.func = &ttm_agp_backend_func;
     63 
     64 	if (ttm_tt_init(&ttm_agp->ttm_dma.ttm, bdev, size, page_flags,
     65 		dummy_read_page) != 0)
     66 		goto fail;
     67 
     68 	/* Success!  */
     69 	return &ttm_agp->ttm_dma.ttm;
     70 
     71 fail:	kmem_free(ttm_agp, sizeof(*ttm_agp));
     72 	return NULL;
     73 }
     74 
     75 int
     76 ttm_agp_tt_populate(struct ttm_tt *ttm)
     77 {
     78 
     79 	if (ttm->state != tt_unpopulated)
     80 		return 0;
     81 
     82 	return ttm_bus_dma_populate(container_of(ttm, struct ttm_dma_tt, ttm));
     83 }
     84 
     85 void
     86 ttm_agp_tt_unpopulate(struct ttm_tt *ttm)
     87 {
     88 
     89 	ttm_bus_dma_unpopulate(container_of(ttm, struct ttm_dma_tt, ttm));
     90 }
     91 
     92 static int
     93 ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
     94 {
     95 	struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp,
     96 	    ttm_dma.ttm);
     97 	struct agp_softc *const sc = ttm_agp->agp;
     98 	struct drm_mm_node *const node = bo_mem->mm_node;
     99 	const unsigned long agp_pgno = node->start;
    100 	unsigned i, j;
    101 	int ret;
    102 
    103 	KASSERT(!ttm_agp->bound);
    104 	KASSERT(ttm_agp->ttm_dma.dma_address->dm_nsegs == ttm->num_pages);
    105 	for (i = 0; i < ttm->num_pages; i++) {
    106 		KASSERT(ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len ==
    107 		    AGP_PAGE_SIZE);
    108 		/* XXX errno NetBSD->Linux */
    109 		ret = -AGP_BIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT,
    110 		    ttm_agp->ttm_dma.dma_address->dm_segs[i].ds_len);
    111 		if (ret)
    112 			goto fail;
    113 	}
    114 	agp_flush_cache();
    115 	AGP_FLUSH_TLB(sc);
    116 
    117 	/* Success!  */
    118 	ttm_agp->agp_pgno = agp_pgno;
    119 	ttm_agp->bound = true;
    120 	return 0;
    121 
    122 fail:	KASSERT(ret);
    123 	for (j = 0; j < i; j++)
    124 		(void)AGP_UNBIND_PAGE(sc, (agp_pgno + j) << AGP_PAGE_SHIFT);
    125 	return ret;
    126 }
    127 
    128 static int
    129 ttm_agp_unbind(struct ttm_tt *ttm)
    130 {
    131 	struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp,
    132 	    ttm_dma.ttm);
    133 	struct agp_softc *const sc = ttm_agp->agp;
    134 	const unsigned long agp_pgno = ttm_agp->agp_pgno;
    135 	unsigned i;
    136 
    137 	/* XXX Can this happen?  */
    138 	if (!ttm_agp->bound)
    139 		return 0;
    140 
    141 	for (i = 0; i < ttm->num_pages; i++)
    142 		(void)AGP_UNBIND_PAGE(sc, (agp_pgno + i) << AGP_PAGE_SHIFT);
    143 
    144 	ttm_agp->agp_pgno = 0;
    145 	ttm_agp->bound = false;
    146 	return 0;
    147 }
    148 
    149 static void
    150 ttm_agp_destroy(struct ttm_tt *ttm)
    151 {
    152 	struct ttm_agp *const ttm_agp = container_of(ttm, struct ttm_agp,
    153 	    ttm_dma.ttm);
    154 
    155 	/* XXX Can this happen?  */
    156 	if (ttm_agp->bound)
    157 		ttm_agp_unbind(ttm);
    158 	ttm_tt_fini(ttm);
    159 	kmem_free(ttm, sizeof(*ttm));
    160 }
    161 
    162 static const struct ttm_backend_func ttm_agp_backend_func = {
    163 	.bind = &ttm_agp_bind,
    164 	.unbind = &ttm_agp_unbind,
    165 	.destroy = &ttm_agp_destroy,
    166 };
    167