On Sun, May 18, 2008 at 07:13:21PM -0500, Tom Tucker wrote:
> Add a dma map count in order to verify that all DMA mapping resources
> have been freed at unmount.
I'm not sure what you mean by "at unmount".
--b.
>
> Signed-off-by: Tom Tucker <tom@xxxxxxxxxxxxxxxxxxxxx>
>
> ---
> include/linux/sunrpc/svc_rdma.h | 1 +
> net/sunrpc/xprtrdma/svc_rdma_recvfrom.c | 1 +
> net/sunrpc/xprtrdma/svc_rdma_sendto.c | 3 +++
> net/sunrpc/xprtrdma/svc_rdma_transport.c | 5 +++++
> 4 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/sunrpc/svc_rdma.h b/include/linux/sunrpc/svc_rdma.h
> index 29bfc9b..0a9c431 100644
> --- a/include/linux/sunrpc/svc_rdma.h
> +++ b/include/linux/sunrpc/svc_rdma.h
> @@ -105,6 +105,7 @@ struct svcxprt_rdma {
>
> struct ib_pd *sc_pd;
>
> + atomic_t sc_dma_used;
> atomic_t sc_ctxt_used;
> struct list_head sc_ctxt_free;
> int sc_ctxt_cnt;
> diff --git a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> index 174e888..9b3dff0 100644
> --- a/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> +++ b/net/sunrpc/xprtrdma/svc_rdma_recvfrom.c
> @@ -229,6 +229,7 @@ static void rdma_set_ctxt_sge(struct svcxprt_rdma *xprt,
> ctxt->count = count;
> ctxt->direction = DMA_FROM_DEVICE;
> for (i = 0; i < count; i++) {
> + atomic_inc(&xprt->sc_dma_used);
> ctxt->sge[i].addr = (unsigned long)
> ib_dma_map_single(xprt->sc_cm_id->device,
> (void*)sge[i].addr, sge[i].length,
> diff --git a/net/sunrpc/xprtrdma/svc_rdma_sendto.c b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> index 85931c4..cdb0732 100644
> --- a/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> +++ b/net/sunrpc/xprtrdma/svc_rdma_sendto.c
> @@ -174,6 +174,7 @@ static int send_write(struct svcxprt_rdma *xprt, struct svc_rqst *rqstp,
> sge_bytes = min((size_t)bc,
> (size_t)(xdr_sge[xdr_sge_no].length-sge_off));
> sge[sge_no].length = sge_bytes;
> + atomic_inc(&xprt->sc_dma_used);
> sge[sge_no].addr =
> ib_dma_map_single(xprt->sc_cm_id->device,
> (void *)
> @@ -399,6 +400,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
> ctxt->count = 1;
>
> /* Prepare the SGE for the RPCRDMA Header */
> + atomic_inc(&rdma->sc_dma_used);
> ctxt->sge[0].addr =
> ib_dma_map_page(rdma->sc_cm_id->device,
> page, 0, PAGE_SIZE, DMA_TO_DEVICE);
> @@ -411,6 +413,7 @@ static int send_reply(struct svcxprt_rdma *rdma,
> sge_bytes = min((size_t)ctxt->sge[sge_no].length,
> (size_t)byte_count);
> byte_count -= sge_bytes;
> + atomic_inc(&rdma->sc_dma_used);
> ctxt->sge[sge_no].addr =
> ib_dma_map_single(rdma->sc_cm_id->device,
> (void *)
> diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
> index 8a50586..68908b5 100644
> --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
> +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
> @@ -155,6 +155,7 @@ static void svc_rdma_unmap_dma(struct svc_rdma_op_ctxt *ctxt)
> struct svcxprt_rdma *xprt = ctxt->xprt;
> int i;
> for (i = 0; i < ctxt->count && ctxt->sge[i].length; i++) {
> + atomic_dec(&xprt->sc_dma_used);
> ib_dma_unmap_single(xprt->sc_cm_id->device,
> ctxt->sge[i].addr,
> ctxt->sge[i].length,
> @@ -493,6 +494,7 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
> cma_xprt->sc_max_requests = svcrdma_max_requests;
> cma_xprt->sc_sq_depth = svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT;
> atomic_set(&cma_xprt->sc_sq_count, 0);
> + atomic_set(&cma_xprt->sc_ctxt_used, 0);
>
> if (!listener) {
> int reqs = cma_xprt->sc_max_requests;
> @@ -543,6 +545,7 @@ int svc_rdma_post_recv(struct svcxprt_rdma *xprt)
> BUG_ON(sge_no >= xprt->sc_max_sge);
> page = svc_rdma_get_page();
> ctxt->pages[sge_no] = page;
> + atomic_inc(&xprt->sc_dma_used);
> pa = ib_dma_map_page(xprt->sc_cm_id->device,
> page, 0, PAGE_SIZE,
> DMA_FROM_DEVICE);
> @@ -1023,6 +1026,7 @@ static void __svc_rdma_free(struct work_struct *work)
>
> /* Warn if we leaked a resource or under-referenced */
> WARN_ON(atomic_read(&rdma->sc_ctxt_used) != 0);
> + WARN_ON(atomic_read(&rdma->sc_dma_used) != 0);
>
> /* Destroy the QP if present (not a listener) */
> if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
> @@ -1143,6 +1147,7 @@ void svc_rdma_send_error(struct svcxprt_rdma *xprt, struct rpcrdma_msg *rmsgp,
> length = svc_rdma_xdr_encode_error(xprt, rmsgp, err, va);
>
> /* Prepare SGE for local address */
> + atomic_inc(&xprt->sc_dma_used);
> sge.addr = ib_dma_map_page(xprt->sc_cm_id->device,
> p, 0, PAGE_SIZE, DMA_FROM_DEVICE);
> sge.lkey = xprt->sc_phys_mr->lkey;
--
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