+ mm-zswap-move-to-use-crypto_acomp-api-for-hardware-acceleration.patch added to -mm tree

[akpm@linux-foundation.org]

The patch titled
     Subject: mm/zswap: move to use crypto_acomp API for hardware acceleration
has been added to the -mm tree.  Its filename is
     mm-zswap-move-to-use-crypto_acomp-api-for-hardware-acceleration.patch

This patch should soon appear at
    http://ozlabs.org/~akpm/mmots/broken-out/mm-zswap-move-to-use-crypto_acomp-api-for-hardware-acceleration.patch
and later at
    http://ozlabs.org/~akpm/mmotm/broken-out/mm-zswap-move-to-use-crypto_acomp-api-for-hardware-acceleration.patch

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------------------------------------------------------
From: Barry Song <song.bao.hua@hisilicon.com>
Subject: mm/zswap: move to use crypto_acomp API for hardware acceleration

Right now, all new ZIP drivers are using crypto_acomp APIs rather than
legacy crypto_comp APIs.  But zswap.c is still using the old APIs.  That
means zswap won't be able to use any new zip drivers in kernel.

This patch moves to use cryto_acomp APIs to fix the problem.  On the other
hand, tradiontal compressors like lz4,lzo etc have been wrapped into acomp
via scomp backend.  So platforms without async compressors can fallback to
use acomp via scomp backend.

Link: http://lkml.kernel.org/r/20200620235033.8420-1-song.bao.hua@hisilicon.com
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Cc: Luis Claudio R. Goncalves <lgoncalv@redhat.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: Mahipal Challa <mahipalreddy2006@gmail.com>
Cc: Seth Jennings <sjenning@redhat.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Cc: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/zswap.c |  153 ++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 110 insertions(+), 43 deletions(-)

--- a/mm/zswap.c~mm-zswap-move-to-use-crypto_acomp-api-for-hardware-acceleration
+++ a/mm/zswap.c
@@ -24,8 +24,10 @@
 #include <linux/rbtree.h>
 #include <linux/swap.h>
 #include <linux/crypto.h>
+#include <linux/scatterlist.h>
 #include <linux/mempool.h>
 #include <linux/zpool.h>
+#include <crypto/acompress.h>
 
 #include <linux/mm_types.h>
 #include <linux/page-flags.h>
@@ -127,9 +129,17 @@ module_param_named(same_filled_pages_ena
 * data structures
 **********************************/
 
+struct crypto_acomp_ctx {
+	struct crypto_acomp *acomp;
+	struct acomp_req *req;
+	struct crypto_wait wait;
+	u8 *dstmem;
+	struct mutex mutex;
+};
+
 struct zswap_pool {
 	struct zpool *zpool;
-	struct crypto_comp * __percpu *tfm;
+	struct crypto_acomp_ctx * __percpu *acomp_ctx;
 	struct kref kref;
 	struct list_head list;
 	struct work_struct release_work;
@@ -415,30 +425,60 @@ static int zswap_dstmem_dead(unsigned in
 static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
 {
 	struct zswap_pool *pool = hlist_entry(node, struct zswap_pool, node);
-	struct crypto_comp *tfm;
+	struct crypto_acomp *acomp;
+	struct acomp_req *req;
+	struct crypto_acomp_ctx *acomp_ctx;
 
-	if (WARN_ON(*per_cpu_ptr(pool->tfm, cpu)))
+	if (WARN_ON(*per_cpu_ptr(pool->acomp_ctx, cpu)))
 		return 0;
 
-	tfm = crypto_alloc_comp(pool->tfm_name, 0, 0);
-	if (IS_ERR_OR_NULL(tfm)) {
-		pr_err("could not alloc crypto comp %s : %ld\n",
-		       pool->tfm_name, PTR_ERR(tfm));
+	acomp_ctx = kzalloc(sizeof(*acomp_ctx), GFP_KERNEL);
+	if (IS_ERR_OR_NULL(acomp_ctx)) {
+		pr_err("Could not initialize acomp_ctx\n");
+		return -ENOMEM;
+	}
+	acomp = crypto_alloc_acomp(pool->tfm_name, 0, 0);
+	if (IS_ERR_OR_NULL(acomp)) {
+		pr_err("could not alloc crypto acomp %s : %ld\n",
+				pool->tfm_name, PTR_ERR(acomp));
+		return -ENOMEM;
+	}
+	acomp_ctx->acomp = acomp;
+
+	req = acomp_request_alloc(acomp_ctx->acomp);
+	if (IS_ERR_OR_NULL(req)) {
+		pr_err("could not alloc crypto acomp %s : %ld\n",
+		       pool->tfm_name, PTR_ERR(acomp));
 		return -ENOMEM;
 	}
-	*per_cpu_ptr(pool->tfm, cpu) = tfm;
+	acomp_ctx->req = req;
+
+	mutex_init(&acomp_ctx->mutex);
+	crypto_init_wait(&acomp_ctx->wait);
+	acomp_request_set_callback(req, CRYPTO_TFM_REQ_MAY_BACKLOG,
+				   crypto_req_done, &acomp_ctx->wait);
+
+	acomp_ctx->dstmem = per_cpu(zswap_dstmem, cpu);
+	*per_cpu_ptr(pool->acomp_ctx, cpu) = acomp_ctx;
+
 	return 0;
 }
 
 static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
 {
 	struct zswap_pool *pool = hlist_entry(node, struct zswap_pool, node);
-	struct crypto_comp *tfm;
+	struct crypto_acomp_ctx *acomp_ctx;
+
+	acomp_ctx = *per_cpu_ptr(pool->acomp_ctx, cpu);
+	if (!IS_ERR_OR_NULL(acomp_ctx)) {
+		if (!IS_ERR_OR_NULL(acomp_ctx->req))
+			acomp_request_free(acomp_ctx->req);
+		if (!IS_ERR_OR_NULL(acomp_ctx->acomp))
+			crypto_free_acomp(acomp_ctx->acomp);
+		kfree(acomp_ctx);
+	}
+	*per_cpu_ptr(pool->acomp_ctx, cpu) = NULL;
 
-	tfm = *per_cpu_ptr(pool->tfm, cpu);
-	if (!IS_ERR_OR_NULL(tfm))
-		crypto_free_comp(tfm);
-	*per_cpu_ptr(pool->tfm, cpu) = NULL;
 	return 0;
 }
 
@@ -561,8 +601,9 @@ static struct zswap_pool *zswap_pool_cre
 	pr_debug("using %s zpool\n", zpool_get_type(pool->zpool));
 
 	strlcpy(pool->tfm_name, compressor, sizeof(pool->tfm_name));
-	pool->tfm = alloc_percpu(struct crypto_comp *);
-	if (!pool->tfm) {
+
+	pool->acomp_ctx = alloc_percpu(struct crypto_acomp_ctx *);
+	if (!pool->acomp_ctx) {
 		pr_err("percpu alloc failed\n");
 		goto error;
 	}
@@ -585,7 +626,7 @@ static struct zswap_pool *zswap_pool_cre
 	return pool;
 
 error:
-	free_percpu(pool->tfm);
+	free_percpu(pool->acomp_ctx);
 	if (pool->zpool)
 		zpool_destroy_pool(pool->zpool);
 	kfree(pool);
@@ -596,14 +637,14 @@ static __init struct zswap_pool *__zswap
 {
 	bool has_comp, has_zpool;
 
-	has_comp = crypto_has_comp(zswap_compressor, 0, 0);
+	has_comp = crypto_has_acomp(zswap_compressor, 0, 0);
 	if (!has_comp && strcmp(zswap_compressor,
 				CONFIG_ZSWAP_COMPRESSOR_DEFAULT)) {
 		pr_err("compressor %s not available, using default %s\n",
 		       zswap_compressor, CONFIG_ZSWAP_COMPRESSOR_DEFAULT);
 		param_free_charp(&zswap_compressor);
 		zswap_compressor = CONFIG_ZSWAP_COMPRESSOR_DEFAULT;
-		has_comp = crypto_has_comp(zswap_compressor, 0, 0);
+		has_comp = crypto_has_acomp(zswap_compressor, 0, 0);
 	}
 	if (!has_comp) {
 		pr_err("default compressor %s not available\n",
@@ -639,7 +680,7 @@ static void zswap_pool_destroy(struct zs
 	zswap_pool_debug("destroying", pool);
 
 	cpuhp_state_remove_instance(CPUHP_MM_ZSWP_POOL_PREPARE, &pool->node);
-	free_percpu(pool->tfm);
+	free_percpu(pool->acomp_ctx);
 	zpool_destroy_pool(pool->zpool);
 	kfree(pool);
 }
@@ -723,7 +764,7 @@ static int __zswap_param_set(const char
 		}
 		type = s;
 	} else if (!compressor) {
-		if (!crypto_has_comp(s, 0, 0)) {
+		if (!crypto_has_acomp(s, 0, 0)) {
 			pr_err("compressor %s not available\n", s);
 			return -ENOENT;
 		}
@@ -774,7 +815,7 @@ static int __zswap_param_set(const char
 		 * failed, maybe both compressor and zpool params were bad.
 		 * Allow changing this param, so pool creation will succeed
 		 * when the other param is changed. We already verified this
-		 * param is ok in the zpool_has_pool() or crypto_has_comp()
+		 * param is ok in the zpool_has_pool() or crypto_has_acomp()
 		 * checks above.
 		 */
 		ret = param_set_charp(s, kp);
@@ -876,7 +917,9 @@ static int zswap_writeback_entry(struct
 	pgoff_t offset;
 	struct zswap_entry *entry;
 	struct page *page;
-	struct crypto_comp *tfm;
+	struct scatterlist input, output;
+	struct crypto_acomp_ctx *acomp_ctx;
+
 	u8 *src, *dst;
 	unsigned int dlen;
 	int ret;
@@ -916,14 +959,21 @@ static int zswap_writeback_entry(struct
 
 	case ZSWAP_SWAPCACHE_NEW: /* page is locked */
 		/* decompress */
+		acomp_ctx = *this_cpu_ptr(entry->pool->acomp_ctx);
+
 		dlen = PAGE_SIZE;
 		src = (u8 *)zhdr + sizeof(struct zswap_header);
-		dst = kmap_atomic(page);
-		tfm = *get_cpu_ptr(entry->pool->tfm);
-		ret = crypto_comp_decompress(tfm, src, entry->length,
-					     dst, &dlen);
-		put_cpu_ptr(entry->pool->tfm);
-		kunmap_atomic(dst);
+		dst = kmap(page);
+
+		mutex_lock(&acomp_ctx->mutex);
+		sg_init_one(&input, src, entry->length);
+		sg_init_one(&output, dst, dlen);
+		acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, dlen);
+		ret = crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait);
+		dlen = acomp_ctx->req->dlen;
+		mutex_unlock(&acomp_ctx->mutex);
+
+		kunmap(page);
 		BUG_ON(ret);
 		BUG_ON(dlen != PAGE_SIZE);
 
@@ -1004,7 +1054,8 @@ static int zswap_frontswap_store(unsigne
 {
 	struct zswap_tree *tree = zswap_trees[type];
 	struct zswap_entry *entry, *dupentry;
-	struct crypto_comp *tfm;
+	struct scatterlist input, output;
+	struct crypto_acomp_ctx *acomp_ctx;
 	int ret;
 	unsigned int hlen, dlen = PAGE_SIZE;
 	unsigned long handle, value;
@@ -1074,12 +1125,20 @@ static int zswap_frontswap_store(unsigne
 	}
 
 	/* compress */
-	dst = get_cpu_var(zswap_dstmem);
-	tfm = *get_cpu_ptr(entry->pool->tfm);
-	src = kmap_atomic(page);
-	ret = crypto_comp_compress(tfm, src, PAGE_SIZE, dst, &dlen);
-	kunmap_atomic(src);
-	put_cpu_ptr(entry->pool->tfm);
+	acomp_ctx = *this_cpu_ptr(entry->pool->acomp_ctx);
+
+	mutex_lock(&acomp_ctx->mutex);
+
+	src = kmap(page);
+	dst = acomp_ctx->dstmem;
+	sg_init_one(&input, src, PAGE_SIZE);
+	/* zswap_dstmem is of size (PAGE_SIZE * 2). Reflect same in sg_list */
+	sg_init_one(&output, dst, PAGE_SIZE * 2);
+	acomp_request_set_params(acomp_ctx->req, &input, &output, PAGE_SIZE, dlen);
+	ret = crypto_wait_req(crypto_acomp_compress(acomp_ctx->req), &acomp_ctx->wait);
+	dlen = acomp_ctx->req->dlen;
+	kunmap(page);
+
 	if (ret) {
 		ret = -EINVAL;
 		goto put_dstmem;
@@ -1103,7 +1162,7 @@ static int zswap_frontswap_store(unsigne
 	memcpy(buf, &zhdr, hlen);
 	memcpy(buf + hlen, dst, dlen);
 	zpool_unmap_handle(entry->pool->zpool, handle);
-	put_cpu_var(zswap_dstmem);
+	mutex_unlock(&acomp_ctx->mutex);
 
 	/* populate entry */
 	entry->offset = offset;
@@ -1131,7 +1190,7 @@ insert_entry:
 	return 0;
 
 put_dstmem:
-	put_cpu_var(zswap_dstmem);
+	mutex_unlock(&acomp_ctx->mutex);
 	zswap_pool_put(entry->pool);
 freepage:
 	zswap_entry_cache_free(entry);
@@ -1148,7 +1207,8 @@ static int zswap_frontswap_load(unsigned
 {
 	struct zswap_tree *tree = zswap_trees[type];
 	struct zswap_entry *entry;
-	struct crypto_comp *tfm;
+	struct scatterlist input, output;
+	struct crypto_acomp_ctx *acomp_ctx;
 	u8 *src, *dst;
 	unsigned int dlen;
 	int ret;
@@ -1175,11 +1235,18 @@ static int zswap_frontswap_load(unsigned
 	src = zpool_map_handle(entry->pool->zpool, entry->handle, ZPOOL_MM_RO);
 	if (zpool_evictable(entry->pool->zpool))
 		src += sizeof(struct zswap_header);
-	dst = kmap_atomic(page);
-	tfm = *get_cpu_ptr(entry->pool->tfm);
-	ret = crypto_comp_decompress(tfm, src, entry->length, dst, &dlen);
-	put_cpu_ptr(entry->pool->tfm);
-	kunmap_atomic(dst);
+	dst = kmap(page);
+
+	acomp_ctx = *this_cpu_ptr(entry->pool->acomp_ctx);
+	mutex_lock(&acomp_ctx->mutex);
+	sg_init_one(&input, src, entry->length);
+	sg_init_one(&output, dst, dlen);
+	acomp_request_set_params(acomp_ctx->req, &input, &output, entry->length, dlen);
+	ret = crypto_wait_req(crypto_acomp_decompress(acomp_ctx->req), &acomp_ctx->wait);
+	dlen = acomp_ctx->req->dlen;
+	mutex_unlock(&acomp_ctx->mutex);
+
+	kunmap(page);
 	zpool_unmap_handle(entry->pool->zpool, entry->handle);
 	BUG_ON(ret);
 
_

Patches currently in -mm which might be from song.bao.hua@hisilicon.com are

mm-cma-fix-the-name-of-cma-areas.patch
mm-hugetlb-fix-the-name-of-hugetlb-cma.patch
mm-zswap-move-to-use-crypto_acomp-api-for-hardware-acceleration.patch