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authorLinus Torvalds <torvalds@linux-foundation.org>2014-09-14 21:54:12 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-09-14 21:54:12 +0400
commit02c1be3d0c308c8a817bd3cc47fd75c843bf1a46 (patch)
treeab381685a8d03590de2245f3cdc3bc5a117f0afd /drivers
parent8ac19f0d90f7de0e78b08770ba2eabd29ad2cb9e (diff)
parent3cc5ba1938eea0de372a41d1687c8030049c5e8f (diff)
downloadlinux-02c1be3d0c308c8a817bd3cc47fd75c843bf1a46.tar.xz
Merge tag 'ntb-3.17' of git://github.com/jonmason/ntb
Pull ntb driver bugfixes from Jon Mason: "NTB driver fixes for queue spread and buffer alignment. Also, update to MAINTAINERS to reflect new e-mail address" * tag 'ntb-3.17' of git://github.com/jonmason/ntb: ntb: Add alignment check to meet hardware requirement MAINTAINERS: update NTB info NTB: correct the spread of queues over mw's
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ntb/ntb_transport.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 9dd63b822025..e9bf2f47b61a 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -510,7 +510,7 @@ static void ntb_transport_setup_qp_mw(struct ntb_transport *nt,
WARN_ON(nt->mw[mw_num].virt_addr == NULL);
- if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max)
+ if (nt->max_qps % mw_max && mw_num + 1 < nt->max_qps / mw_max)
num_qps_mw = nt->max_qps / mw_max + 1;
else
num_qps_mw = nt->max_qps / mw_max;
@@ -576,6 +576,19 @@ static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
return -ENOMEM;
}
+ /*
+ * we must ensure that the memory address allocated is BAR size
+ * aligned in order for the XLAT register to take the value. This
+ * is a requirement of the hardware. It is recommended to setup CMA
+ * for BAR sizes equal or greater than 4MB.
+ */
+ if (!IS_ALIGNED(mw->dma_addr, mw->size)) {
+ dev_err(&pdev->dev, "DMA memory %pad not aligned to BAR size\n",
+ &mw->dma_addr);
+ ntb_free_mw(nt, num_mw);
+ return -ENOMEM;
+ }
+
/* Notify HW the memory location of the receive buffer */
ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr);
@@ -856,7 +869,7 @@ static int ntb_transport_init_queue(struct ntb_transport *nt,
qp->client_ready = NTB_LINK_DOWN;
qp->event_handler = NULL;
- if (nt->max_qps % mw_max && mw_num < nt->max_qps % mw_max)
+ if (nt->max_qps % mw_max && mw_num + 1 < nt->max_qps / mw_max)
num_qps_mw = nt->max_qps / mw_max + 1;
else
num_qps_mw = nt->max_qps / mw_max;