Re: [PATCH v2 6/7] misc: bcm-vk: add Broadcom VK driver

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Thanks Dan, I'll send out new version as soon as my other patch (you had requested for test_fx mutex cleanups)
https://lore.kernel.org/linux-arm-msm/20200415002517.4328-1-scott.branden@xxxxxxxxxxxx/

hits the linux-next tree so this patch series will apply cleanly to linux-next.




On 2020-04-18 4:47 a.m., Dan Carpenter wrote:
On Sat, Apr 18, 2020 at 02:45:16PM +0300, Dan Carpenter wrote:
On Fri, Apr 17, 2020 at 02:49:11PM -0700, Scott Branden wrote:
+static int bcm_vk_dma_alloc(struct device *dev,
+			    struct bcm_vk_dma *dma,
+			    int direction,
+			    struct _vk_data *vkdata)
+{
+	dma_addr_t addr, sg_addr;
+	int err;
+	int i;
+	int offset;
+	uint32_t size;
+	uint32_t remaining_size;
+	uint32_t transfer_size;
+	uint64_t data;
+	unsigned long first, last;
+	struct _vk_data *sgdata;
+
+	/* Get 64-bit user address */
+	data = get_unaligned(&(vkdata->address));
Extra parens.
removed
+
+	/* offset into first page */
+	offset = offset_in_page(data);
+
+	/* Calculate number of pages */
+	first = (data & PAGE_MASK) >> PAGE_SHIFT;
+	last  = ((data + vkdata->size - 1) & PAGE_MASK) >> PAGE_SHIFT;
+	dma->nr_pages = last - first + 1;
+
+	/* Allocate DMA pages */
+	dma->pages = kmalloc_array(dma->nr_pages,
+				   sizeof(struct page *),
+				   GFP_KERNEL);
+	if (dma->pages == NULL)
+		return -ENOMEM;
+
+	dev_dbg(dev, "Alloc DMA Pages [0x%llx+0x%x => %d pages]\n",
+		data, vkdata->size, dma->nr_pages);
+
+	dma->direction = direction;
+
+	/* Get user pages into memory */
+	err = get_user_pages_fast(data & PAGE_MASK,
+				  dma->nr_pages,
+				  direction == DMA_FROM_DEVICE,
+				  dma->pages);
+	if (err != dma->nr_pages) {
+		dma->nr_pages = (err >= 0) ? err : 0;
+		dev_err(dev, "get_user_pages_fast, err=%d [%d]\n",
+			err, dma->nr_pages);
+		return err < 0 ? err : -EINVAL;
+	}
+
+	/* Max size of sg list is 1 per mapped page + fields at start */
+	dma->sglen = (dma->nr_pages * sizeof(*sgdata)) +
+		     (sizeof(uint32_t) * SGLIST_VKDATA_START);
+
+	/* Allocate sglist */
+	dma->sglist = dma_alloc_coherent(dev,
+					 dma->sglen,
+					 &dma->handle,
+					 GFP_KERNEL);
	dma->sglist = dma_alloc_coherent(dev, dma->sglen, &dma->handle,
					 GFP_KERNEL);
done

+	if (!dma->sglist)
+		return -ENOMEM;
No cleanup?
what needs to be cleaned up?
dma->pages should be freed probably?  And a put_user_pages_fast()?
Sorry put_user_pages_fast() isn't a function.  My bad.

regards,
dan carpenter




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