RDMA/siw: Remove kmap()

kmap() is being deprecated and will break uses of device dax after PKS
protection is introduced.[1]

These uses of kmap() in the SIW driver are thread local.  Therefore
kmap_local_page() is sufficient to use and will work with pgmap protected
pages when those are implemnted.

There is one more use of kmap() in this driver which is split into its own
patch because kmap_local_page() has strict ordering rules and the use of
the kmap_mask over multiple segments must be handled carefully.
Therefore, that conversion is handled in a stand alone patch.

Use kmap_local_page() instead of kmap() in the 'easy' cases.

[1] https://lore.kernel.org/lkml/20201009195033.3208459-59-ira.weiny@intel.com/

Link: https://lore.kernel.org/r/20210622061422.2633501-4-ira.weiny@intel.com
Signed-off-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

diff --git a/drivers/infiniband/sw/siw/siw_qp_tx.c b/drivers/infiniband/sw/siw/siw_qp_tx.c
index 7989c4043db4ef0d6e894ffa3b6ae82a1ba253cb..db68a10d12cd7760e4059324c10e5058384f9e4a 100644 (file)
--- 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_local_page(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_local(buffer);
 
                                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_local_page(p);
                                memcpy(paddr + part, buffer, bytes - part);
                        }
-                       kunmap(p);
+                       kunmap_local(buffer);
                }
        }
        return (int)bytes;
@@ -485,6 +485,7 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
 
                while (sge_len) {
                        size_t plen = min((int)PAGE_SIZE - fp_off, sge_len);
+                       void *kaddr;
 
                        if (!is_kva) {
                                struct page *p;
@@ -517,10 +518,11 @@ static int siw_tx_hdt(struct siw_iwarp_tx *c_tx, struct socket *s)
                                                        iov[seg].iov_base,
                                                        plen);
                                } else if (do_crc) {
+                                       kaddr = kmap_local_page(p);
                                        crypto_shash_update(c_tx->mpa_crc_hd,
-                                                           kmap(p) + fp_off,
+                                                           kaddr + fp_off,
                                                            plen);
-                                       kunmap(p);
+                                       kunmap_local(kaddr);
                                }
                        } else {
                                u64 va = sge->laddr + sge_off;