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Date: Fri, 17 Apr 2009 12:49:22 +0100
From: "Sosnowski, Maciej" <maciej.sosnowski@...el.com>
To: "Williams, Dan J" <dan.j.williams@...el.com>,
Alexander Beregalov <a.beregalov@...il.com>
CC: Kernel Testers List <kernel-testers@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: RE: 2.6.30-rc1: ioatdma: DMA-API: device driver frees DMA memory
with wrong function
Dan Williams wrote:
> On Wed, Apr 15, 2009 at 5:39 AM, Alexander Beregalov
> <a.beregalov@...il.com> wrote:
>> 2009/4/9 Alexander Beregalov <a.beregalov@...il.com>:
>>> ioatdma 0000:00:08.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
>>> ioatdma 0000:00:08.0: setting latency timer to 64
>>> ioatdma 0000:00:08.0: Intel(R) I/OAT DMA Engine found, 4 channels,
>>> device version 0x12, driver version 3.64
>>> alloc irq_desc for 33 on cpu 0 node 0
>>> alloc kstat_irqs on cpu 0 node 0
>>> ioatdma 0000:00:08.0: irq 33 for MSI/MSI-X
>>> ------------[ cut here ]------------
>>> WARNING: at lib/dma-debug.c:565 check_unmap+0x2f6/0x6a0()
>>> Hardware name: PowerEdge 1950
>>> 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 problem still persists.
>
> Thanks for the report Alexander. Maciej and I are looking into a fix.
>
> Regards,
> Dan
Hi Alexander,
Could you check if the following patch helps?
Thanks,
Maciej
---
drivers/dma/dmaengine.c | 17 +++++++++++------
drivers/dma/ioat_dma.c | 41 +++++++++++++++++++++++++----------------
include/linux/dmaengine.h | 6 ++++++
3 files changed, 42 insertions(+), 22 deletions(-)
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_async_memcpy_buf_to_buf(struct dma_c
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_async_memcpy_buf_to_pg(struct dma_ch
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_async_memcpy_pg_to_pg(struct dma_cha
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..9d7db7c 100644
--- a/drivers/dma/ioat_dma.c
+++ b/drivers/dma/ioat_dma.c
@@ -1063,22 +1063,31 @@ static void ioat_dma_cleanup_tasklet(uns
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_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_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)) {
+ 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);
+ }
}
/**
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 2e2aa3d..dc3235a 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -78,12 +78,18 @@ #define DMA_TX_TYPE_END (DMA_SLAVE + 1)
* 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),
};
/**
--
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