60 lines
1.4 KiB
C
60 lines
1.4 KiB
C
/*
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* Copyright (C) STMicroelectronics SA 2015
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* Authors: Yannick Fertre <yannick.fertre@st.com>
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* Hugues Fruchet <hugues.fruchet@st.com>
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* License terms: GNU General Public License (GPL), version 2
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*/
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#include "hva.h"
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#include "hva-mem.h"
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int hva_mem_alloc(struct hva_ctx *ctx, u32 size, const char *name,
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struct hva_buffer **buf)
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{
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struct device *dev = ctx_to_dev(ctx);
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struct hva_buffer *b;
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dma_addr_t paddr;
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void *base;
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b = devm_kzalloc(dev, sizeof(*b), GFP_KERNEL);
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if (!b)
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return -ENOMEM;
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base = dma_alloc_attrs(dev, size, &paddr, GFP_KERNEL | GFP_DMA,
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DMA_ATTR_WRITE_COMBINE);
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if (!base) {
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dev_err(dev, "%s %s : dma_alloc_attrs failed for %s (size=%d)\n",
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ctx->name, __func__, name, size);
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devm_kfree(dev, b);
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return -ENOMEM;
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}
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b->size = size;
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b->paddr = paddr;
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b->vaddr = base;
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b->name = name;
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dev_dbg(dev,
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"%s allocate %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
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ctx->name, size, b->vaddr, &b->paddr, b->name);
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/* return hva buffer to user */
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*buf = b;
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return 0;
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}
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void hva_mem_free(struct hva_ctx *ctx, struct hva_buffer *buf)
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{
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struct device *dev = ctx_to_dev(ctx);
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dev_dbg(dev,
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"%s free %d bytes of HW memory @(virt=%p, phy=%pad): %s\n",
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ctx->name, buf->size, buf->vaddr, &buf->paddr, buf->name);
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dma_free_attrs(dev, buf->size, buf->vaddr, buf->paddr,
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DMA_ATTR_WRITE_COMBINE);
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devm_kfree(dev, buf);
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}
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