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      1 /*
      2  * Copyright (C) 2009-2010 Francisco Jerez.
      3  * All Rights Reserved.
      4  *
      5  * Permission is hereby granted, free of charge, to any person obtaining
      6  * a copy of this software and associated documentation files (the
      7  * "Software"), to deal in the Software without restriction, including
      8  * without limitation the rights to use, copy, modify, merge, publish,
      9  * distribute, sublicense, and/or sell copies of the Software, and to
     10  * permit persons to whom the Software is furnished to do so, subject to
     11  * the following conditions:
     12  *
     13  * The above copyright notice and this permission notice (including the
     14  * next paragraph) shall be included in all copies or substantial
     15  * portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
     18  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
     19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
     20  * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
     21  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
     22  * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
     23  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
     24  *
     25  */
     26 
     27 #include "nouveau_driver.h"
     28 #include "nouveau_context.h"
     29 
     30 /*
     31  * Returns a pointer to a chunk of 'size' bytes long GART memory. 'bo'
     32  * and 'offset' will point to the returned memory.
     33  */
     34 void *
     35 nouveau_get_scratch(struct gl_context *ctx, unsigned size,
     36 		    struct nouveau_bo **bo, unsigned *offset)
     37 {
     38 	struct nouveau_client *client = context_client(ctx);
     39 	struct nouveau_scratch_state *scratch =
     40 		&to_nouveau_context(ctx)->scratch;
     41 	void *buf;
     42 
     43 	if (scratch->buf && size <= NOUVEAU_SCRATCH_SIZE - scratch->offset) {
     44 		nouveau_bo_ref(scratch->bo[scratch->index], bo);
     45 
     46 		buf = scratch->buf + scratch->offset;
     47 		*offset = scratch->offset;
     48 		scratch->offset += size;
     49 
     50 	} else if (size <= NOUVEAU_SCRATCH_SIZE) {
     51 		scratch->index = (scratch->index + 1) % NOUVEAU_SCRATCH_COUNT;
     52 		nouveau_bo_ref(scratch->bo[scratch->index], bo);
     53 
     54 		nouveau_bo_map(*bo, NOUVEAU_BO_WR, client);
     55 		buf = scratch->buf = (*bo)->map;
     56 
     57 		*offset = 0;
     58 		scratch->offset = size;
     59 
     60 	} else {
     61 		nouveau_bo_new(context_dev(ctx), NOUVEAU_BO_GART |
     62 			       NOUVEAU_BO_MAP, 0, size, NULL, bo);
     63 
     64 		nouveau_bo_map(*bo, NOUVEAU_BO_WR, client);
     65 		buf = (*bo)->map;
     66 
     67 		*offset = 0;
     68 	}
     69 
     70 	return buf;
     71 }
     72 
     73 void
     74 nouveau_scratch_init(struct gl_context *ctx)
     75 {
     76 	struct nouveau_scratch_state *scratch =
     77 		&to_nouveau_context(ctx)->scratch;
     78 	int ret, i;
     79 
     80 	for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++) {
     81 		ret = nouveau_bo_new(context_dev(ctx), NOUVEAU_BO_GART |
     82 				     NOUVEAU_BO_MAP, 0, NOUVEAU_SCRATCH_SIZE,
     83 				     NULL, &scratch->bo[i]);
     84 		assert(!ret);
     85 	}
     86 }
     87 
     88 void
     89 nouveau_scratch_destroy(struct gl_context *ctx)
     90 {
     91 	struct nouveau_scratch_state *scratch =
     92 		&to_nouveau_context(ctx)->scratch;
     93 	int i;
     94 
     95 	for (i = 0; i < NOUVEAU_SCRATCH_COUNT; i++)
     96 		nouveau_bo_ref(NULL, &scratch->bo[i]);
     97 }
     98