cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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msgpool.c (2388B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <linux/ceph/ceph_debug.h>
      3
      4#include <linux/err.h>
      5#include <linux/sched.h>
      6#include <linux/types.h>
      7#include <linux/vmalloc.h>
      8
      9#include <linux/ceph/messenger.h>
     10#include <linux/ceph/msgpool.h>
     11
     12static void *msgpool_alloc(gfp_t gfp_mask, void *arg)
     13{
     14	struct ceph_msgpool *pool = arg;
     15	struct ceph_msg *msg;
     16
     17	msg = ceph_msg_new2(pool->type, pool->front_len, pool->max_data_items,
     18			    gfp_mask, true);
     19	if (!msg) {
     20		dout("msgpool_alloc %s failed\n", pool->name);
     21	} else {
     22		dout("msgpool_alloc %s %p\n", pool->name, msg);
     23		msg->pool = pool;
     24	}
     25	return msg;
     26}
     27
     28static void msgpool_free(void *element, void *arg)
     29{
     30	struct ceph_msgpool *pool = arg;
     31	struct ceph_msg *msg = element;
     32
     33	dout("msgpool_release %s %p\n", pool->name, msg);
     34	msg->pool = NULL;
     35	ceph_msg_put(msg);
     36}
     37
     38int ceph_msgpool_init(struct ceph_msgpool *pool, int type,
     39		      int front_len, int max_data_items, int size,
     40		      const char *name)
     41{
     42	dout("msgpool %s init\n", name);
     43	pool->type = type;
     44	pool->front_len = front_len;
     45	pool->max_data_items = max_data_items;
     46	pool->pool = mempool_create(size, msgpool_alloc, msgpool_free, pool);
     47	if (!pool->pool)
     48		return -ENOMEM;
     49	pool->name = name;
     50	return 0;
     51}
     52
     53void ceph_msgpool_destroy(struct ceph_msgpool *pool)
     54{
     55	dout("msgpool %s destroy\n", pool->name);
     56	mempool_destroy(pool->pool);
     57}
     58
     59struct ceph_msg *ceph_msgpool_get(struct ceph_msgpool *pool, int front_len,
     60				  int max_data_items)
     61{
     62	struct ceph_msg *msg;
     63
     64	if (front_len > pool->front_len ||
     65	    max_data_items > pool->max_data_items) {
     66		pr_warn_ratelimited("%s need %d/%d, pool %s has %d/%d\n",
     67		    __func__, front_len, max_data_items, pool->name,
     68		    pool->front_len, pool->max_data_items);
     69		WARN_ON_ONCE(1);
     70
     71		/* try to alloc a fresh message */
     72		return ceph_msg_new2(pool->type, front_len, max_data_items,
     73				     GFP_NOFS, false);
     74	}
     75
     76	msg = mempool_alloc(pool->pool, GFP_NOFS);
     77	dout("msgpool_get %s %p\n", pool->name, msg);
     78	return msg;
     79}
     80
     81void ceph_msgpool_put(struct ceph_msgpool *pool, struct ceph_msg *msg)
     82{
     83	dout("msgpool_put %s %p\n", pool->name, msg);
     84
     85	/* reset msg front_len; user may have changed it */
     86	msg->front.iov_len = pool->front_len;
     87	msg->hdr.front_len = cpu_to_le32(pool->front_len);
     88
     89	msg->data_length = 0;
     90	msg->num_data_items = 0;
     91
     92	kref_init(&msg->kref);  /* retake single ref */
     93	mempool_free(msg, pool->pool);
     94}