1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) STMicroelectronics SA 2015
4 * Authors: Yannick Fertre <yannick.fertre@st.com>
5 * Hugues Fruchet <hugues.fruchet@st.com>
6 */
7
8 #include "hva.h"
9 #include "hva-mem.h"
10
hva_mem_alloc(struct hva_ctx * ctx,u32 size,const char * name,struct hva_buffer ** buf)11 int hva_mem_alloc(struct hva_ctx *ctx, u32 size, const char *name,
12 struct hva_buffer **buf)
13 {
14 struct device *dev = ctx_to_dev(ctx);
15 struct hva_buffer *b;
16 dma_addr_t paddr;
17 void *base;
18
19 b = devm_kzalloc(dev, sizeof(*b), GFP_KERNEL);
20 if (!b) {
21 ctx->sys_errors++;
22 return -ENOMEM;
23 }
24
25 base = dma_alloc_attrs(dev, size, &paddr, GFP_KERNEL,
26 DMA_ATTR_WRITE_COMBINE);
27 if (!base) {
28 dev_err(dev, "%s %s : dma_alloc_attrs failed for %s (size=%d)\n",
29 ctx->name, __func__, name, size);
30 ctx->sys_errors++;
31 devm_kfree(dev, b);
32 return -ENOMEM;
33 }
34
35 b->size = size;
36 b->paddr = paddr;
37 b->vaddr = base;
38 b->name = name;
39
40 dev_dbg(dev,
41 "%s allocate %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
42 ctx->name, size, b->vaddr, &b->paddr, b->name);
43
44 /* return hva buffer to user */
45 *buf = b;
46
47 return 0;
48 }
49
hva_mem_free(struct hva_ctx * ctx,struct hva_buffer * buf)50 void hva_mem_free(struct hva_ctx *ctx, struct hva_buffer *buf)
51 {
52 struct device *dev = ctx_to_dev(ctx);
53
54 dev_dbg(dev,
55 "%s free %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
56 ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);
57
58 dma_free_attrs(dev, buf->size, buf->vaddr, buf->paddr,
59 DMA_ATTR_WRITE_COMBINE);
60
61 devm_kfree(dev, buf);
62 }
63