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amd-xgbe: Fix DMA API debug warning 

When running a kernel configured with CONFIG_DMA_API_DEBUG=y a warning
is issued:
  DMA-API: device driver tries to sync DMA memory it has not allocated

This warning is the result of mapping the full range of the Rx buffer
pages allocated and then performing a dma_sync_single_for_cpu against
a calculated DMA address. The proper thing to do is to use the
dma_sync_single_range_for_cpu with a base DMA address and an offset.

Reported-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Tested-by: Kim Phillips <kim.phillips@arm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lendacky, Thomas 2015-07-06 11:57:37 -05:00 committed by David S. Miller
parent 95ec655bc4
commit cfbfd86bfd
4 changed files with 22 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/net/ethernet/amd/xgbe/xgbe-desc.c
View File

@ -303,7 +303,8 @@ static void xgbe_set_buffer_data(struct xgbe_buffer_data *bd,
get_page(pa->pages);
bd->pa = *pa;
bd->dma = pa->pages_dma + pa->pages_offset;
bd->dma_base = pa->pages_dma;
bd->dma_off = pa->pages_offset;
bd->dma_len = len;
pa->pages_offset += len;

11
drivers/net/ethernet/amd/xgbe/xgbe-dev.c
View File

@ -1110,6 +1110,7 @@ static void xgbe_rx_desc_reset(struct xgbe_prv_data *pdata,
unsigned int rx_usecs = pdata->rx_usecs;
unsigned int rx_frames = pdata->rx_frames;
unsigned int inte;
dma_addr_t hdr_dma, buf_dma;
if (!rx_usecs && !rx_frames) {
/* No coalescing, interrupt for every descriptor */
@ -1129,10 +1130,12 @@ static void xgbe_rx_desc_reset(struct xgbe_prv_data *pdata,
* Set buffer 2 (hi) address to buffer dma address (hi) and
* set control bits OWN and INTE
*/
rdesc->desc0 = cpu_to_le32(lower_32_bits(rdata->rx.hdr.dma));
rdesc->desc1 = cpu_to_le32(upper_32_bits(rdata->rx.hdr.dma));
rdesc->desc2 = cpu_to_le32(lower_32_bits(rdata->rx.buf.dma));
rdesc->desc3 = cpu_to_le32(upper_32_bits(rdata->rx.buf.dma));
hdr_dma = rdata->rx.hdr.dma_base + rdata->rx.hdr.dma_off;
buf_dma = rdata->rx.buf.dma_base + rdata->rx.buf.dma_off;
rdesc->desc0 = cpu_to_le32(lower_32_bits(hdr_dma));
rdesc->desc1 = cpu_to_le32(upper_32_bits(hdr_dma));
rdesc->desc2 = cpu_to_le32(lower_32_bits(buf_dma));
rdesc->desc3 = cpu_to_le32(upper_32_bits(buf_dma));
XGMAC_SET_BITS_LE(rdesc->desc3, RX_NORMAL_DESC3, INTE, inte);

17
drivers/net/ethernet/amd/xgbe/xgbe-drv.c
View File

@ -1765,8 +1765,9 @@ static struct sk_buff *xgbe_create_skb(struct xgbe_prv_data *pdata,
/* Start with the header buffer which may contain just the header
* or the header plus data
*/
dma_sync_single_for_cpu(pdata->dev, rdata->rx.hdr.dma,
rdata->rx.hdr.dma_len, DMA_FROM_DEVICE);
dma_sync_single_range_for_cpu(pdata->dev, rdata->rx.hdr.dma_base,
rdata->rx.hdr.dma_off,
rdata->rx.hdr.dma_len, DMA_FROM_DEVICE);
packet = page_address(rdata->rx.hdr.pa.pages) +
rdata->rx.hdr.pa.pages_offset;
@ -1778,8 +1779,11 @@ static struct sk_buff *xgbe_create_skb(struct xgbe_prv_data *pdata,
len -= copy_len;
if (len) {
/* Add the remaining data as a frag */
dma_sync_single_for_cpu(pdata->dev, rdata->rx.buf.dma,
rdata->rx.buf.dma_len, DMA_FROM_DEVICE);
dma_sync_single_range_for_cpu(pdata->dev,
rdata->rx.buf.dma_base,
rdata->rx.buf.dma_off,
rdata->rx.buf.dma_len,
DMA_FROM_DEVICE);
skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags,
rdata->rx.buf.pa.pages,
@ -1945,8 +1949,9 @@ read_again:
if (!skb)
error = 1;
} else if (rdesc_len) {
dma_sync_single_for_cpu(pdata->dev,
rdata->rx.buf.dma,
dma_sync_single_range_for_cpu(pdata->dev,
rdata->rx.buf.dma_base,
rdata->rx.buf.dma_off,
rdata->rx.buf.dma_len,
DMA_FROM_DEVICE);

3
drivers/net/ethernet/amd/xgbe/xgbe.h
View File

@ -337,7 +337,8 @@ struct xgbe_buffer_data {
struct xgbe_page_alloc pa;
struct xgbe_page_alloc pa_unmap;
dma_addr_t dma;
dma_addr_t dma_base;
unsigned long dma_off;
unsigned int dma_len;
};