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  • Committer: Suren A. Chilingaryan
  • Date: 2015-06-12 15:24:18 UTC
  • Revision ID: csa@suren.me-20150612152418-b121bqoszonwsqbo
Support streaming mode in IPEDMA

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dma/ipe.c
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            else if ((reuse_desc & PCILIB_KMEM_REUSE_HARDWARE) == 0) pcilib_warning("Lost DMA buffers are found (missing HW reference), reinitializing...");
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            else {
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#ifndef IPEDMA_BUG_DMARD
 
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# ifndef IPEDMA_STREAMING_MODE
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                RD(IPEDMA_REG_PAGE_COUNT, value);
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                if (value != IPEDMA_DMA_PAGES) pcilib_warning("Inconsistent DMA buffers are found (Number of allocated buffers (%lu) does not match current request (%lu)), reinitializing...", value + 1, IPEDMA_DMA_PAGES);
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                else
 
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# endif /* IPEDMA_STREAMING_MODE */
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#endif /* IPEDMA_BUG_DMARD */
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                    preserve = 1;
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            }
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        ret = cb(cbattr, packet_flags, ctx->page_size, buf);
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        if (ret < 0) return -ret;
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            // We don't need this because hardwaredoes not intend to read anything from the memory
 
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            // We don't need this because hardware does not intend to read anything from the memory
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//      pcilib_kmem_sync_block(ctx->dmactx.pcilib, ctx->pages, PCILIB_KMEM_SYNC_TODEVICE, cur_read);
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            // Return buffer into the DMA pool when processed
 
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#ifdef IPEDMA_STREAMING_MODE
 
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        uintptr_t buf_ba = pcilib_kmem_get_block_ba(ctx->dmactx.pcilib, ctx->pages, cur_read);
 
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        WR(IPEDMA_REG_PAGE_ADDR, buf_ba);    
 
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# ifdef IPEDMA_STREAMING_CHECKS
 
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        pcilib_register_value_t streaming_status;
 
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        RD(IPEDMA_REG_STREAMING_STATUS, streaming_status);
 
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        if (streaming_status)
 
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            pcilib_error("Invalid status (0x%lx) adding a DMA buffer into the queue", streaming_status);
 
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# endif /* IPEDMA_STREAMING_MODE */
 
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#endif /* IPEDMA_STREAMING_MODE */
 
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            // Numbered from 1
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#ifdef IPEDMA_BUG_LAST_READ
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        WR(IPEDMA_REG_LAST_READ, cur_read?cur_read:IPEDMA_DMA_PAGES);