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Date:   Fri,  9 Oct 2020 12:49:45 -0700
From:   ira.weiny@...el.com
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Dennis Dalessandro <dennis.dalessandro@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Faisal Latif <faisal.latif@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Bernard Metzler <bmt@...ich.ibm.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kexec@...ts.infradead.org, linux-bcache@...r.kernel.org,
        linux-mtd@...ts.infradead.org, devel@...verdev.osuosl.org,
        linux-efi@...r.kernel.org, linux-mmc@...r.kernel.org,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-nfs@...r.kernel.org, ceph-devel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-aio@...ck.org,
        io-uring@...r.kernel.org, linux-erofs@...ts.ozlabs.org,
        linux-um@...ts.infradead.org, linux-ntfs-dev@...ts.sourceforge.net,
        reiserfs-devel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-nilfs@...r.kernel.org, cluster-devel@...hat.com,
        ecryptfs@...r.kernel.org, linux-cifs@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-rdma@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-cachefs@...hat.com,
        samba-technical@...ts.samba.org, intel-wired-lan@...ts.osuosl.org
Subject: [PATCH RFC PKS/PMEM 10/58] drivers/rdma: Utilize new kmap_thread()

From: Ira Weiny <ira.weiny@...el.com>

The kmap() calls in these drivers are localized to a single thread.  To
avoid the over head of global PKRS updates use the new kmap_thread()
call.

Cc: Mike Marciniszyn <mike.marciniszyn@...el.com>
Cc: Dennis Dalessandro <dennis.dalessandro@...el.com>
Cc: Doug Ledford <dledford@...hat.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>
Cc: Faisal Latif <faisal.latif@...el.com>
Cc: Shiraz Saleem <shiraz.saleem@...el.com>
Cc: Bernard Metzler <bmt@...ich.ibm.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 drivers/infiniband/hw/hfi1/sdma.c      |  4 ++--
 drivers/infiniband/hw/i40iw/i40iw_cm.c | 10 +++++-----
 drivers/infiniband/sw/siw/siw_qp_tx.c  | 14 +++++++-------
 3 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/sdma.c b/drivers/infiniband/hw/hfi1/sdma.c
index 04575c9afd61..09d206e3229a 100644
--- a/drivers/infiniband/hw/hfi1/sdma.c
+++ b/drivers/infiniband/hw/hfi1/sdma.c
@@ -3130,7 +3130,7 @@ int ext_coal_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx,
 		}
 
 		if (type == SDMA_MAP_PAGE) {
-			kvaddr = kmap(page);
+			kvaddr = kmap_thread(page);
 			kvaddr += offset;
 		} else if (WARN_ON(!kvaddr)) {
 			__sdma_txclean(dd, tx);
@@ -3140,7 +3140,7 @@ int ext_coal_sdma_tx_descs(struct hfi1_devdata *dd, struct sdma_txreq *tx,
 		memcpy(tx->coalesce_buf + tx->coalesce_idx, kvaddr, len);
 		tx->coalesce_idx += len;
 		if (type == SDMA_MAP_PAGE)
-			kunmap(page);
+			kunmap_thread(page);
 
 		/* If there is more data, return */
 		if (tx->tlen - tx->coalesce_idx)
diff --git a/drivers/infiniband/hw/i40iw/i40iw_cm.c b/drivers/infiniband/hw/i40iw/i40iw_cm.c
index a3b95805c154..122d7a5642a1 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_cm.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_cm.c
@@ -3721,7 +3721,7 @@ int i40iw_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
 		ibmr->device = iwpd->ibpd.device;
 		iwqp->lsmm_mr = ibmr;
 		if (iwqp->page)
-			iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
+			iwqp->sc_qp.qp_uk.sq_base = kmap_thread(iwqp->page);
 		dev->iw_priv_qp_ops->qp_send_lsmm(&iwqp->sc_qp,
 							iwqp->ietf_mem.va,
 							(accept.size + conn_param->private_data_len),
@@ -3729,12 +3729,12 @@ int i40iw_accept(struct iw_cm_id *cm_id, struct iw_cm_conn_param *conn_param)
 
 	} else {
 		if (iwqp->page)
-			iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
+			iwqp->sc_qp.qp_uk.sq_base = kmap_thread(iwqp->page);
 		dev->iw_priv_qp_ops->qp_send_lsmm(&iwqp->sc_qp, NULL, 0, 0);
 	}
 
 	if (iwqp->page)
-		kunmap(iwqp->page);
+		kunmap_thread(iwqp->page);
 
 	iwqp->cm_id = cm_id;
 	cm_node->cm_id = cm_id;
@@ -4102,10 +4102,10 @@ static void i40iw_cm_event_connected(struct i40iw_cm_event *event)
 	i40iw_cm_init_tsa_conn(iwqp, cm_node);
 	read0 = (cm_node->send_rdma0_op == SEND_RDMA_READ_ZERO);
 	if (iwqp->page)
-		iwqp->sc_qp.qp_uk.sq_base = kmap(iwqp->page);
+		iwqp->sc_qp.qp_uk.sq_base = kmap_thread(iwqp->page);
 	dev->iw_priv_qp_ops->qp_send_rtt(&iwqp->sc_qp, read0);
 	if (iwqp->page)
-		kunmap(iwqp->page);
+		kunmap_thread(iwqp->page);
 
 	memset(&attr, 0, sizeof(attr));
 	attr.qp_state = IB_QPS_RTS;
diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
index d19d8325588b..4ed37c328d02 100644
--- a/drivers/infiniband/sw/siw/siw_qp_tx.c
+++ b/drivers/infiniband/sw/siw/siw_qp_tx.c
@@ -76,7 +76,7 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
 			if (unlikely(!p))
 				return -EFAULT;
 
-			buffer = kmap(p);
+			buffer = kmap_thread(p);
 
 			if (likely(PAGE_SIZE - off >= bytes)) {
 				memcpy(paddr, buffer + off, bytes);
@@ -84,7 +84,7 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
 				unsigned long part = bytes - (PAGE_SIZE - off);
 
 				memcpy(paddr, buffer + off, part);
-				kunmap(p);
+				kunmap_thread(p);
 
 				if (!mem->is_pbl)
 					p = siw_get_upage(mem->umem,
@@ -96,10 +96,10 @@ static int siw_try_1seg(struct siw_iwarp_tx *c_tx, void *paddr)
 				if (unlikely(!p))
 					return -EFAULT;
 
-				buffer = kmap(p);
+				buffer = kmap_thread(p);
 				memcpy(paddr + part, buffer, bytes - part);
 			}
-			kunmap(p);
+			kunmap_thread(p);
 		}
 	}
 	return (int)bytes;
@@ -505,7 +505,7 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
 				page_array[seg] = p;
 
 				if (!c_tx->use_sendpage) {
-					iov[seg].iov_base = kmap(p) + fp_off;
+					iov[seg].iov_base = kmap_thread(p) + fp_off;
 					iov[seg].iov_len = plen;
 
 					/* Remember for later kunmap() */
@@ -518,9 +518,9 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
 							plen);
 				} else if (do_crc) {
 					crypto_shash_update(c_tx->mpa_crc_hd,
-							    kmap(p) + fp_off,
+							    kmap_thread(p) + fp_off,
 							    plen);
-					kunmap(p);
+					kunmap_thread(p);
 				}
 			} else {
 				u64 va = sge->laddr + sge_off;
-- 
2.28.0.rc0.12.gb6a658bd00c9

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