staging: zcache: crypto API support

This patch allow zcache to use the crypto API for page compression.
It replaces the direct LZO compress/decompress calls with calls
into the crypto compression API. The compressor to be used is
specified in the kernel boot line with the zcache parameter like:
zcache=lzo or zcache=deflate.  If the specified compressor can't
be loaded, zcache uses lzo as the default compressor.

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/zcache/Kconfig b/drivers/staging/zcache/Kconfig
index 7fabcb2..1b7bba7 100644 (file)
--- a/drivers/staging/zcache/Kconfig
+++ b/drivers/staging/zcache/Kconfig
@@ -1,13 +1,12 @@
 config ZCACHE
        tristate "Dynamic compression of swap pages and clean pagecache pages"
-       depends on CLEANCACHE || FRONTSWAP
+       depends on (CLEANCACHE || FRONTSWAP) && CRYPTO
        select XVMALLOC
-       select LZO_COMPRESS
-       select LZO_DECOMPRESS
+       select CRYPTO_LZO
        default n
        help
          Zcache doubles RAM efficiency while providing a significant
-         performance boosts on many workloads.  Zcache uses lzo1x
+         performance boosts on many workloads.  Zcache uses
          compression and an in-kernel implementation of transcendent
          memory to store clean page cache pages and swap in RAM,
          providing a noticeable reduction in disk I/O.

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index 642840c..da222c2 100644 (file)
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -6,7 +6,8 @@
  *
  * Zcache provides an in-kernel "host implementation" for transcendent memory
  * and, thus indirectly, for cleancache and frontswap.  Zcache includes two
- * page-accessible memory [1] interfaces, both utilizing lzo1x compression:
+ * page-accessible memory [1] interfaces, both utilizing the crypto compression
+ * API:
  * 1) "compression buddies" ("zbud") is used for ephemeral pages
  * 2) xvmalloc is used for persistent pages.
  * Xvmalloc (based on the TLSF allocator) has very low fragmentation
@@ -23,12 +24,13 @@
 #include <linux/cpu.h>
 #include <linux/highmem.h>
 #include <linux/list.h>
-#include <linux/lzo.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/atomic.h>
 #include <linux/math64.h>
+#include <linux/crypto.h>
+#include <linux/string.h>
 #include "tmem.h"
 
 #include "../zram/xvmalloc.h" /* if built in drivers/staging */
@@ -81,6 +83,38 @@ static inline bool is_local_client(struct zcache_client *cli)
        return cli == &zcache_host;
 }
 
+/* crypto API for zcache  */
+#define ZCACHE_COMP_NAME_SZ CRYPTO_MAX_ALG_NAME
+static char zcache_comp_name[ZCACHE_COMP_NAME_SZ];
+static struct crypto_comp * __percpu *zcache_comp_pcpu_tfms;
+
+enum comp_op {
+       ZCACHE_COMPOP_COMPRESS,
+       ZCACHE_COMPOP_DECOMPRESS
+};
+
+static inline int zcache_comp_op(enum comp_op op,
+                               const u8 *src, unsigned int slen,
+                               u8 *dst, unsigned int *dlen)
+{
+       struct crypto_comp *tfm;
+       int ret;
+
+       BUG_ON(!zcache_comp_pcpu_tfms);
+       tfm = *per_cpu_ptr(zcache_comp_pcpu_tfms, get_cpu());
+       BUG_ON(!tfm);
+       switch (op) {
+       case ZCACHE_COMPOP_COMPRESS:
+               ret = crypto_comp_compress(tfm, src, slen, dst, dlen);
+               break;
+       case ZCACHE_COMPOP_DECOMPRESS:
+               ret = crypto_comp_decompress(tfm, src, slen, dst, dlen);
+               break;
+       }
+       put_cpu();
+       return ret;
+}
+
 /**********
  * Compression buddies ("zbud") provides for packing two (or, possibly
  * in the future, more) compressed ephemeral pages into a single "raw"
@@ -408,7 +442,7 @@ static int zbud_decompress(struct page *page, struct zbud_hdr *zh)
 {
        struct zbud_page *zbpg;
        unsigned budnum = zbud_budnum(zh);
-       size_t out_len = PAGE_SIZE;
+       unsigned int out_len = PAGE_SIZE;
        char *to_va, *from_va;
        unsigned size;
        int ret = 0;
@@ -425,8 +459,9 @@ static int zbud_decompress(struct page *page, struct zbud_hdr *zh)
        to_va = kmap_atomic(page, KM_USER0);
        size = zh->size;
        from_va = zbud_data(zh, size);
-       ret = lzo1x_decompress_safe(from_va, size, to_va, &out_len);
-       BUG_ON(ret != LZO_E_OK);
+       ret = zcache_comp_op(ZCACHE_COMPOP_DECOMPRESS, from_va, size,
+                               to_va, &out_len);
+       BUG_ON(ret);
        BUG_ON(out_len != PAGE_SIZE);
        kunmap_atomic(to_va, KM_USER0);
 out:
@@ -624,7 +659,7 @@ static int zbud_show_cumul_chunk_counts(char *buf)
 
 /**********
  * This "zv" PAM implementation combines the TLSF-based xvMalloc
- * with lzo1x compression to maximize the amount of data that can
+ * with the crypto compression API to maximize the amount of data that can
  * be packed into a physical page.
  *
  * Zv represents a PAM page with the index and object (plus a "size" value
@@ -711,7 +746,7 @@ static void zv_free(struct xv_pool *xvpool, struct zv_hdr *zv)
 
 static void zv_decompress(struct page *page, struct zv_hdr *zv)
 {
-       size_t clen = PAGE_SIZE;
+       unsigned int clen = PAGE_SIZE;
        char *to_va;
        unsigned size;
        int ret;
@@ -720,10 +755,10 @@ static void zv_decompress(struct page *page, struct zv_hdr *zv)
        size = xv_get_object_size(zv) - sizeof(*zv);
        BUG_ON(size == 0);
        to_va = kmap_atomic(page, KM_USER0);
-       ret = lzo1x_decompress_safe((char *)zv + sizeof(*zv),
-                                       size, to_va, &clen);
+       ret = zcache_comp_op(ZCACHE_COMPOP_DECOMPRESS, (char *)zv + sizeof(*zv),
+                               size, to_va, &clen);
        kunmap_atomic(to_va, KM_USER0);
-       BUG_ON(ret != LZO_E_OK);
+       BUG_ON(ret);
        BUG_ON(clen != PAGE_SIZE);
 }
 
@@ -1286,25 +1321,24 @@ static struct tmem_pamops zcache_pamops = {
  * zcache compression/decompression and related per-cpu stuff
  */
 
-#define LZO_WORKMEM_BYTES LZO1X_1_MEM_COMPRESS
-#define LZO_DSTMEM_PAGE_ORDER 1
-static DEFINE_PER_CPU(unsigned char *, zcache_workmem);
 static DEFINE_PER_CPU(unsigned char *, zcache_dstmem);
+#define ZCACHE_DSTMEM_ORDER 1
 
 static int zcache_compress(struct page *from, void **out_va, size_t *out_len)
 {
        int ret = 0;
        unsigned char *dmem = __get_cpu_var(zcache_dstmem);
-       unsigned char *wmem = __get_cpu_var(zcache_workmem);
        char *from_va;
 
        BUG_ON(!irqs_disabled());
-       if (unlikely(dmem == NULL || wmem == NULL))
-               goto out;  /* no buffer, so can't compress */
+       if (unlikely(dmem == NULL))
+               goto out;  /* no buffer or no compressor so can't compress */
+       *out_len = PAGE_SIZE << ZCACHE_DSTMEM_ORDER;
        from_va = kmap_atomic(from, KM_USER0);
        mb();
-       ret = lzo1x_1_compress(from_va, PAGE_SIZE, dmem, out_len, wmem);
-       BUG_ON(ret != LZO_E_OK);
+       ret = zcache_comp_op(ZCACHE_COMPOP_COMPRESS, from_va, PAGE_SIZE, dmem,
+                               (unsigned int *)out_len);
+       BUG_ON(ret);
        *out_va = dmem;
        kunmap_atomic(from_va, KM_USER0);
        ret = 1;
@@ -1312,29 +1346,48 @@ out:
        return ret;
 }
 
+static int zcache_comp_cpu_up(int cpu)
+{
+       struct crypto_comp *tfm;
+
+       tfm = crypto_alloc_comp(zcache_comp_name, 0, 0);
+       if (IS_ERR(tfm))
+               return NOTIFY_BAD;
+       *per_cpu_ptr(zcache_comp_pcpu_tfms, cpu) = tfm;
+       return NOTIFY_OK;
+}
+
+static void zcache_comp_cpu_down(int cpu)
+{
+       struct crypto_comp *tfm;
+
+       tfm = *per_cpu_ptr(zcache_comp_pcpu_tfms, cpu);
+       crypto_free_comp(tfm);
+       *per_cpu_ptr(zcache_comp_pcpu_tfms, cpu) = NULL;
+}
 
 static int zcache_cpu_notifier(struct notifier_block *nb,
                                unsigned long action, void *pcpu)
 {
-       int cpu = (long)pcpu;
+       int ret, cpu = (long)pcpu;
        struct zcache_preload *kp;
 
        switch (action) {
        case CPU_UP_PREPARE:
+               ret = zcache_comp_cpu_up(cpu);
+               if (ret != NOTIFY_OK) {
+                       pr_err("zcache: can't allocate compressor transform\n");
+                       return ret;
+               }
                per_cpu(zcache_dstmem, cpu) = (void *)__get_free_pages(
-                       GFP_KERNEL | __GFP_REPEAT,
-                       LZO_DSTMEM_PAGE_ORDER),
-               per_cpu(zcache_workmem, cpu) =
-                       kzalloc(LZO1X_MEM_COMPRESS,
-                               GFP_KERNEL | __GFP_REPEAT);
+                       GFP_KERNEL | __GFP_REPEAT, ZCACHE_DSTMEM_ORDER);
                break;
        case CPU_DEAD:
        case CPU_UP_CANCELED:
+               zcache_comp_cpu_down(cpu);
                free_pages((unsigned long)per_cpu(zcache_dstmem, cpu),
-                               LZO_DSTMEM_PAGE_ORDER);
+                       ZCACHE_DSTMEM_ORDER);
                per_cpu(zcache_dstmem, cpu) = NULL;
-               kfree(per_cpu(zcache_workmem, cpu));
-               per_cpu(zcache_workmem, cpu) = NULL;
                kp = &per_cpu(zcache_preloads, cpu);
                while (kp->nr) {
                        kmem_cache_free(zcache_objnode_cache,
@@ -1919,6 +1972,44 @@ static int __init no_frontswap(char *s)
 
 __setup("nofrontswap", no_frontswap);
 
+static int __init enable_zcache_compressor(char *s)
+{
+       strncpy(zcache_comp_name, s, ZCACHE_COMP_NAME_SZ);
+       zcache_enabled = 1;
+       return 1;
+}
+__setup("zcache=", enable_zcache_compressor);
+
+
+static int zcache_comp_init(void)
+{
+       int ret = 0;
+
+       /* check crypto algorithm */
+       if (*zcache_comp_name != '\0') {
+               ret = crypto_has_comp(zcache_comp_name, 0, 0);
+               if (!ret)
+                       pr_info("zcache: %s not supported\n",
+                                       zcache_comp_name);
+       }
+       if (!ret)
+               strcpy(zcache_comp_name, "lzo");
+       ret = crypto_has_comp(zcache_comp_name, 0, 0);
+       if (!ret) {
+               ret = 1;
+               goto out;
+       }
+       pr_info("zcache: using %s compressor\n", zcache_comp_name);
+
+       /* alloc percpu transforms */
+       ret = 0;
+       zcache_comp_pcpu_tfms = alloc_percpu(struct crypto_comp *);
+       if (!zcache_comp_pcpu_tfms)
+               ret = 1;
+out:
+       return ret;
+}
+
 static int __init zcache_init(void)
 {
        int ret = 0;
@@ -1941,6 +2032,11 @@ static int __init zcache_init(void)
                        pr_err("zcache: can't register cpu notifier\n");
                        goto out;
                }
+               ret = zcache_comp_init();
+               if (ret) {
+                       pr_err("zcache: compressor initialization failed\n");
+                       goto out;
+               }
                for_each_online_cpu(cpu) {
                        void *pcpu = (void *)(long)cpu;
                        zcache_cpu_notifier(&zcache_cpu_notifier_block,