On Wed, Nov 23, 2016 at 06:57:31PM +0800, Peter Xu wrote:
> +void edu_dma(struct pci_edu_dev *dev, iova_t iova,
> + size_t size, int dev_offset, bool from_device)
> +{
> + uint64_t from, to;
> + uint32_t cmd = EDU_CMD_DMA_START;
> +
> + assert(size <= EDU_DMA_SIZE_MAX);
> + assert(dev_offset < EDU_DMA_SIZE_MAX &&
> + dev_offset >= 0);
Any reason for dev_offset not to be unsigned?
> + printf("edu device DMA start %s addr %p size 0x%lu off 0x%x\n",
> + from_device ? "FROM" : "TO",
> + (void *)iova, size, dev_offset);
> +
> + if (from_device) {
> + from = dev_offset + EDU_DMA_START;
> + to = iova;
> + cmd |= EDU_CMD_DMA_FROM;
> + } else {
> + from = iova;
> + to = EDU_DMA_START + dev_offset;
> + cmd |= EDU_CMD_DMA_TO;
> + }
> +
> + edu_reg_writeq(dev, EDU_REG_DMA_SRC, from);
> + edu_reg_writeq(dev, EDU_REG_DMA_DST, to);
> + edu_reg_writeq(dev, EDU_REG_DMA_COUNT, size);
> + edu_reg_writel(dev, EDU_REG_DMA_CMD, cmd);
> +
> + /* Wait until DMA finished */
> + while (edu_reg_readl(dev, EDU_REG_DMA_CMD) & EDU_CMD_DMA_START)
> + cpu_relax();
> +}
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