ioatdma: fix "ioatdma frees DMA memory with wrong function"
as reported by Alexander Beregalov <a.beregalov@gmail.com>
ioatdma 0000:00:08.0: DMA-API: device driver frees DMA memory with
wrong function [device address=0x000000007f76f800] [size=2000 bytes]
[map
ped as single] [unmapped as page]
The ioatdma driver was unmapping all regions
(either allocated as page or single) using unmap_page.
This patch lets dma driver recognize if unmap_single or unmap_page should be used.
It introduces two new dma control flags:
DMA_COMPL_SRC_UNMAP_SINGLE and DMA_COMPL_DEST_UNMAP_SINGLE.
They should be set to indicate dma driver to do dma-unmapping as single
(first one for the source, tha latter for the destination).
If respective flag is not set, the driver assumes dma-unmapping as page.
Signed-off-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Tested-by: Alexander Beregalov <a.beregalov@gmail.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 92438e9..5a87384 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -804,11 +804,14 @@
dma_addr_t dma_dest, dma_src;
dma_cookie_t cookie;
int cpu;
+ unsigned long flags;
dma_src = dma_map_single(dev->dev, src, len, DMA_TO_DEVICE);
dma_dest = dma_map_single(dev->dev, dest, len, DMA_FROM_DEVICE);
- tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
- DMA_CTRL_ACK);
+ flags = DMA_CTRL_ACK |
+ DMA_COMPL_SRC_UNMAP_SINGLE |
+ DMA_COMPL_DEST_UNMAP_SINGLE;
+ tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len, flags);
if (!tx) {
dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
@@ -850,11 +853,12 @@
dma_addr_t dma_dest, dma_src;
dma_cookie_t cookie;
int cpu;
+ unsigned long flags;
dma_src = dma_map_single(dev->dev, kdata, len, DMA_TO_DEVICE);
dma_dest = dma_map_page(dev->dev, page, offset, len, DMA_FROM_DEVICE);
- tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
- DMA_CTRL_ACK);
+ flags = DMA_CTRL_ACK | DMA_COMPL_SRC_UNMAP_SINGLE;
+ tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len, flags);
if (!tx) {
dma_unmap_single(dev->dev, dma_src, len, DMA_TO_DEVICE);
@@ -898,12 +902,13 @@
dma_addr_t dma_dest, dma_src;
dma_cookie_t cookie;
int cpu;
+ unsigned long flags;
dma_src = dma_map_page(dev->dev, src_pg, src_off, len, DMA_TO_DEVICE);
dma_dest = dma_map_page(dev->dev, dest_pg, dest_off, len,
DMA_FROM_DEVICE);
- tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len,
- DMA_CTRL_ACK);
+ flags = DMA_CTRL_ACK;
+ tx = dev->device_prep_dma_memcpy(chan, dma_dest, dma_src, len, flags);
if (!tx) {
dma_unmap_page(dev->dev, dma_src, len, DMA_TO_DEVICE);
diff --git a/drivers/dma/ioat_dma.c b/drivers/dma/ioat_dma.c
index e4fc33c..1955ee8 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -1063,22 +1063,31 @@
static void
ioat_dma_unmap(struct ioat_dma_chan *ioat_chan, struct ioat_desc_sw *desc)
{
- /*
- * yes we are unmapping both _page and _single
- * alloc'd regions with unmap_page. Is this
- * *really* that bad?
- */
- if (!(desc->async_tx.flags & DMA_COMPL_SKIP_DEST_UNMAP))
- pci_unmap_page(ioat_chan->device->pdev,
- pci_unmap_addr(desc, dst),
- pci_unmap_len(desc, len),
- PCI_DMA_FROMDEVICE);
+ if (!(desc->async_tx.flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
+ if (desc->async_tx.flags & DMA_COMPL_DEST_UNMAP_SINGLE)
+ pci_unmap_single(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, dst),
+ pci_unmap_len(desc, len),
+ PCI_DMA_FROMDEVICE);
+ else
+ pci_unmap_page(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, dst),
+ pci_unmap_len(desc, len),
+ PCI_DMA_FROMDEVICE);
+ }
- if (!(desc->async_tx.flags & DMA_COMPL_SKIP_SRC_UNMAP))
- pci_unmap_page(ioat_chan->device->pdev,
- pci_unmap_addr(desc, src),
- pci_unmap_len(desc, len),
- PCI_DMA_TODEVICE);
+ if (!(desc->async_tx.flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
+ if (desc->async_tx.flags & DMA_COMPL_SRC_UNMAP_SINGLE)
+ pci_unmap_single(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, src),
+ pci_unmap_len(desc, len),
+ PCI_DMA_TODEVICE);
+ else
+ pci_unmap_page(ioat_chan->device->pdev,
+ pci_unmap_addr(desc, src),
+ pci_unmap_len(desc, len),
+ PCI_DMA_TODEVICE);
+ }
}
/**
@@ -1363,6 +1372,7 @@
int err = 0;
struct completion cmp;
unsigned long tmo;
+ unsigned long flags;
src = kzalloc(sizeof(u8) * IOAT_TEST_SIZE, GFP_KERNEL);
if (!src)
@@ -1392,8 +1402,9 @@
DMA_TO_DEVICE);
dma_dest = dma_map_single(dma_chan->device->dev, dest, IOAT_TEST_SIZE,
DMA_FROM_DEVICE);
+ flags = DMA_COMPL_SRC_UNMAP_SINGLE | DMA_COMPL_DEST_UNMAP_SINGLE;
tx = device->common.device_prep_dma_memcpy(dma_chan, dma_dest, dma_src,
- IOAT_TEST_SIZE, 0);
+ IOAT_TEST_SIZE, flags);
if (!tx) {
dev_err(&device->pdev->dev,
"Self-test prep failed, disabling\n");
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 2e2aa3d..ffefba8 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -78,12 +78,18 @@
* dependency chains
* @DMA_COMPL_SKIP_SRC_UNMAP - set to disable dma-unmapping the source buffer(s)
* @DMA_COMPL_SKIP_DEST_UNMAP - set to disable dma-unmapping the destination(s)
+ * @DMA_COMPL_SRC_UNMAP_SINGLE - set to do the source dma-unmapping as single
+ * (if not set, do the source dma-unmapping as page)
+ * @DMA_COMPL_DEST_UNMAP_SINGLE - set to do the destination dma-unmapping as single
+ * (if not set, do the destination dma-unmapping as page)
*/
enum dma_ctrl_flags {
DMA_PREP_INTERRUPT = (1 << 0),
DMA_CTRL_ACK = (1 << 1),
DMA_COMPL_SKIP_SRC_UNMAP = (1 << 2),
DMA_COMPL_SKIP_DEST_UNMAP = (1 << 3),
+ DMA_COMPL_SRC_UNMAP_SINGLE = (1 << 4),
+ DMA_COMPL_DEST_UNMAP_SINGLE = (1 << 5),
};
/**