[mirror_zfs.git] / module / os / linux / zfs / qat_compress.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or https://opensource.org/licenses/CDDL-1.0.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

#if defined(_KERNEL) && defined(HAVE_QAT)
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/completion.h>
#include <sys/zfs_context.h>
#include <sys/byteorder.h>
#include <sys/zio.h>
#include <sys/qat.h>

/*
 * Max instances in a QAT device, each instance is a channel to submit
 * jobs to QAT hardware, this is only for pre-allocating instance and
 * session arrays; the actual number of instances are defined in the
 * QAT driver's configuration file.
 */
#define	QAT_DC_MAX_INSTANCES	48

/*
 * ZLIB head and foot size
 */
#define	ZLIB_HEAD_SZ		2
#define	ZLIB_FOOT_SZ		4

static CpaInstanceHandle dc_inst_handles[QAT_DC_MAX_INSTANCES];
static CpaDcSessionHandle session_handles[QAT_DC_MAX_INSTANCES];
static CpaBufferList **buffer_array[QAT_DC_MAX_INSTANCES];
static Cpa16U num_inst = 0;
static Cpa32U inst_num = 0;
static boolean_t qat_dc_init_done = B_FALSE;
int zfs_qat_compress_disable = 0;

boolean_t
qat_dc_use_accel(size_t s_len)
{
	return (!zfs_qat_compress_disable &&
	    qat_dc_init_done &&
	    s_len >= QAT_MIN_BUF_SIZE &&
	    s_len <= QAT_MAX_BUF_SIZE);
}

static void
qat_dc_callback(void *p_callback, CpaStatus status)
{
	if (p_callback != NULL)
		complete((struct completion *)p_callback);
}

static void
qat_dc_clean(void)
{
	Cpa16U buff_num = 0;
	Cpa16U num_inter_buff_lists = 0;

	for (Cpa16U i = 0; i < num_inst; i++) {
		cpaDcStopInstance(dc_inst_handles[i]);
		QAT_PHYS_CONTIG_FREE(session_handles[i]);
		/* free intermediate buffers  */
		if (buffer_array[i] != NULL) {
			cpaDcGetNumIntermediateBuffers(
			    dc_inst_handles[i], &num_inter_buff_lists);
			for (buff_num = 0; buff_num < num_inter_buff_lists;
			    buff_num++) {
				CpaBufferList *buffer_inter =
				    buffer_array[i][buff_num];
				if (buffer_inter->pBuffers) {
					QAT_PHYS_CONTIG_FREE(
					    buffer_inter->pBuffers->pData);
					QAT_PHYS_CONTIG_FREE(
					    buffer_inter->pBuffers);
				}
				QAT_PHYS_CONTIG_FREE(
				    buffer_inter->pPrivateMetaData);
				QAT_PHYS_CONTIG_FREE(buffer_inter);
			}
		}
	}

	num_inst = 0;
	qat_dc_init_done = B_FALSE;
}

int
qat_dc_init(void)
{
	CpaStatus status = CPA_STATUS_SUCCESS;
	Cpa32U sess_size = 0;
	Cpa32U ctx_size = 0;
	Cpa16U num_inter_buff_lists = 0;
	Cpa16U buff_num = 0;
	Cpa32U buff_meta_size = 0;
	CpaDcSessionSetupData sd = {0};

	if (qat_dc_init_done)
		return (0);

	status = cpaDcGetNumInstances(&num_inst);
	if (status != CPA_STATUS_SUCCESS)
		return (-1);

	/* if the user has configured no QAT compression units just return */
	if (num_inst == 0)
		return (0);

	if (num_inst > QAT_DC_MAX_INSTANCES)
		num_inst = QAT_DC_MAX_INSTANCES;

	status = cpaDcGetInstances(num_inst, &dc_inst_handles[0]);
	if (status != CPA_STATUS_SUCCESS)
		return (-1);

	for (Cpa16U i = 0; i < num_inst; i++) {
		cpaDcSetAddressTranslation(dc_inst_handles[i],
		    (void*)virt_to_phys);

		status = cpaDcBufferListGetMetaSize(dc_inst_handles[i],
		    1, &buff_meta_size);

		if (status == CPA_STATUS_SUCCESS)
			status = cpaDcGetNumIntermediateBuffers(
			    dc_inst_handles[i], &num_inter_buff_lists);

		if (status == CPA_STATUS_SUCCESS && num_inter_buff_lists != 0)
			status = QAT_PHYS_CONTIG_ALLOC(&buffer_array[i],
			    num_inter_buff_lists *
			    sizeof (CpaBufferList *));

		for (buff_num = 0; buff_num < num_inter_buff_lists;
		    buff_num++) {
			if (status == CPA_STATUS_SUCCESS)
				status = QAT_PHYS_CONTIG_ALLOC(
				    &buffer_array[i][buff_num],
				    sizeof (CpaBufferList));

			if (status == CPA_STATUS_SUCCESS)
				status = QAT_PHYS_CONTIG_ALLOC(
				    &buffer_array[i][buff_num]->
				    pPrivateMetaData,
				    buff_meta_size);

			if (status == CPA_STATUS_SUCCESS)
				status = QAT_PHYS_CONTIG_ALLOC(
				    &buffer_array[i][buff_num]->pBuffers,
				    sizeof (CpaFlatBuffer));

			if (status == CPA_STATUS_SUCCESS) {
				/*
				 *  implementation requires an intermediate
				 *  buffer approximately twice the size of
				 *  output buffer, which is 2x max buffer
				 *  size here.
				 */
				status = QAT_PHYS_CONTIG_ALLOC(
				    &buffer_array[i][buff_num]->pBuffers->
				    pData, 2 * QAT_MAX_BUF_SIZE);
				if (status != CPA_STATUS_SUCCESS)
					goto fail;

				buffer_array[i][buff_num]->numBuffers = 1;
				buffer_array[i][buff_num]->pBuffers->
				    dataLenInBytes = 2 * QAT_MAX_BUF_SIZE;
			}
		}

		status = cpaDcStartInstance(dc_inst_handles[i],
		    num_inter_buff_lists, buffer_array[i]);
		if (status != CPA_STATUS_SUCCESS)
			goto fail;

		sd.compLevel = CPA_DC_L1;
		sd.compType = CPA_DC_DEFLATE;
		sd.huffType = CPA_DC_HT_FULL_DYNAMIC;
		sd.sessDirection = CPA_DC_DIR_COMBINED;
		sd.sessState = CPA_DC_STATELESS;
#if (CPA_DC_API_VERSION_NUM_MAJOR == 1 && CPA_DC_API_VERSION_NUM_MINOR < 6)
		sd.deflateWindowSize = 7;
#endif
		sd.checksum = CPA_DC_ADLER32;
		status = cpaDcGetSessionSize(dc_inst_handles[i],
		    &sd, &sess_size, &ctx_size);
		if (status != CPA_STATUS_SUCCESS)
			goto fail;

		QAT_PHYS_CONTIG_ALLOC(&session_handles[i], sess_size);
		if (session_handles[i] == NULL)
			goto fail;

		status = cpaDcInitSession(dc_inst_handles[i],
		    session_handles[i],
		    &sd, NULL, qat_dc_callback);
		if (status != CPA_STATUS_SUCCESS)
			goto fail;
	}

	qat_dc_init_done = B_TRUE;
	return (0);
fail:
	qat_dc_clean();
	return (-1);
}

void
qat_dc_fini(void)
{
	if (!qat_dc_init_done)
		return;

	qat_dc_clean();
}

/*
 * The "add" parameter is an additional buffer which is passed
 * to QAT as a scratch buffer alongside the destination buffer
 * in case the "compressed" data ends up being larger than the
 * original source data. This is necessary to prevent QAT from
 * generating buffer overflow warnings for incompressible data.
 */
static int
qat_compress_impl(qat_compress_dir_t dir, char *src, int src_len,
    char *dst, int dst_len, char *add, int add_len, size_t *c_len)
{
	CpaInstanceHandle dc_inst_handle;
	CpaDcSessionHandle session_handle;
	CpaBufferList *buf_list_src = NULL;
	CpaBufferList *buf_list_dst = NULL;
	CpaFlatBuffer *flat_buf_src = NULL;
	CpaFlatBuffer *flat_buf_dst = NULL;
	Cpa8U *buffer_meta_src = NULL;
	Cpa8U *buffer_meta_dst = NULL;
	Cpa32U buffer_meta_size = 0;
	CpaDcRqResults dc_results = {.checksum = 1};
	CpaStatus status = CPA_STATUS_FAIL;
	Cpa32U hdr_sz = 0;
	Cpa32U compressed_sz;
	Cpa32U num_src_buf = (src_len >> PAGE_SHIFT) + 2;
	Cpa32U num_dst_buf = (dst_len >> PAGE_SHIFT) + 2;
	Cpa32U num_add_buf = (add_len >> PAGE_SHIFT) + 2;
	Cpa32U bytes_left;
	Cpa32U dst_pages = 0;
	Cpa32U adler32 = 0;
	char *data;
	struct page *page;
	struct page **in_pages = NULL;
	struct page **out_pages = NULL;
	struct page **add_pages = NULL;
	Cpa32U page_off = 0;
	struct completion complete;
	Cpa32U page_num = 0;
	Cpa16U i;

	/*
	 * We increment num_src_buf and num_dst_buf by 2 to allow
	 * us to handle non page-aligned buffer addresses and buffers
	 * whose sizes are not divisible by PAGE_SIZE.
	 */
	Cpa32U src_buffer_list_mem_size = sizeof (CpaBufferList) +
	    (num_src_buf * sizeof (CpaFlatBuffer));
	Cpa32U dst_buffer_list_mem_size = sizeof (CpaBufferList) +
	    ((num_dst_buf + num_add_buf) * sizeof (CpaFlatBuffer));

	status = QAT_PHYS_CONTIG_ALLOC(&in_pages,
	    num_src_buf * sizeof (struct page *));
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	status = QAT_PHYS_CONTIG_ALLOC(&out_pages,
	    num_dst_buf * sizeof (struct page *));
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	status = QAT_PHYS_CONTIG_ALLOC(&add_pages,
	    num_add_buf * sizeof (struct page *));
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	i = (Cpa32U)atomic_inc_32_nv(&inst_num) % num_inst;
	dc_inst_handle = dc_inst_handles[i];
	session_handle = session_handles[i];

	cpaDcBufferListGetMetaSize(dc_inst_handle, num_src_buf,
	    &buffer_meta_size);
	status = QAT_PHYS_CONTIG_ALLOC(&buffer_meta_src, buffer_meta_size);
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	cpaDcBufferListGetMetaSize(dc_inst_handle, num_dst_buf + num_add_buf,
	    &buffer_meta_size);
	status = QAT_PHYS_CONTIG_ALLOC(&buffer_meta_dst, buffer_meta_size);
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	/* build source buffer list */
	status = QAT_PHYS_CONTIG_ALLOC(&buf_list_src, src_buffer_list_mem_size);
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	flat_buf_src = (CpaFlatBuffer *)(buf_list_src + 1);

	buf_list_src->pBuffers = flat_buf_src; /* always point to first one */

	/* build destination buffer list */
	status = QAT_PHYS_CONTIG_ALLOC(&buf_list_dst, dst_buffer_list_mem_size);
	if (status != CPA_STATUS_SUCCESS)
		goto fail;

	flat_buf_dst = (CpaFlatBuffer *)(buf_list_dst + 1);

	buf_list_dst->pBuffers = flat_buf_dst; /* always point to first one */

	buf_list_src->numBuffers = 0;
	buf_list_src->pPrivateMetaData = buffer_meta_src;
	bytes_left = src_len;
	data = src;
	page_num = 0;
	while (bytes_left > 0) {
		page_off = ((long)data & ~PAGE_MASK);
		page = qat_mem_to_page(data);
		in_pages[page_num] = page;
		flat_buf_src->pData = kmap(page) + page_off;
		flat_buf_src->dataLenInBytes =
		    min((long)PAGE_SIZE - page_off, (long)bytes_left);

		bytes_left -= flat_buf_src->dataLenInBytes;
		data += flat_buf_src->dataLenInBytes;
		flat_buf_src++;
		buf_list_src->numBuffers++;
		page_num++;
	}

	buf_list_dst->numBuffers = 0;
	buf_list_dst->pPrivateMetaData = buffer_meta_dst;
	bytes_left = dst_len;
	data = dst;
	page_num = 0;
	while (bytes_left > 0) {
		page_off = ((long)data & ~PAGE_MASK);
		page = qat_mem_to_page(data);
		flat_buf_dst->pData = kmap(page) + page_off;
		out_pages[page_num] = page;
		flat_buf_dst->dataLenInBytes =
		    min((long)PAGE_SIZE - page_off, (long)bytes_left);

		bytes_left -= flat_buf_dst->dataLenInBytes;
		data += flat_buf_dst->dataLenInBytes;
		flat_buf_dst++;
		buf_list_dst->numBuffers++;
		page_num++;
		dst_pages++;
	}

	/* map additional scratch pages into the destination buffer list */
	bytes_left = add_len;
	data = add;
	page_num = 0;
	while (bytes_left > 0) {
		page_off = ((long)data & ~PAGE_MASK);
		page = qat_mem_to_page(data);
		flat_buf_dst->pData = kmap(page) + page_off;
		add_pages[page_num] = page;
		flat_buf_dst->dataLenInBytes =
		    min((long)PAGE_SIZE - page_off, (long)bytes_left);

		bytes_left -= flat_buf_dst->dataLenInBytes;
		data += flat_buf_dst->dataLenInBytes;
		flat_buf_dst++;
		buf_list_dst->numBuffers++;
		page_num++;
	}

	init_completion(&complete);

	if (dir == QAT_COMPRESS) {
		QAT_STAT_BUMP(comp_requests);
		QAT_STAT_INCR(comp_total_in_bytes, src_len);

		cpaDcGenerateHeader(session_handle,
		    buf_list_dst->pBuffers, &hdr_sz);
		buf_list_dst->pBuffers->pData += hdr_sz;
		buf_list_dst->pBuffers->dataLenInBytes -= hdr_sz;
		status = cpaDcCompressData(
		    dc_inst_handle, session_handle,
		    buf_list_src, buf_list_dst,
		    &dc_results, CPA_DC_FLUSH_FINAL,
		    &complete);
		if (status != CPA_STATUS_SUCCESS) {
			goto fail;
		}

		/* we now wait until the completion of the operation. */
		wait_for_completion(&complete);

		if (dc_results.status != CPA_STATUS_SUCCESS) {
			status = CPA_STATUS_FAIL;
			goto fail;
		}

		compressed_sz = dc_results.produced;
		if (compressed_sz + hdr_sz + ZLIB_FOOT_SZ > dst_len) {
			status = CPA_STATUS_INCOMPRESSIBLE;
			goto fail;
		}

		/* get adler32 checksum and append footer */
		*(Cpa32U*)(dst + hdr_sz + compressed_sz) =
		    BSWAP_32(dc_results.checksum);

		*c_len = hdr_sz + compressed_sz + ZLIB_FOOT_SZ;
		QAT_STAT_INCR(comp_total_out_bytes, *c_len);
	} else {
		ASSERT3U(dir, ==, QAT_DECOMPRESS);
		QAT_STAT_BUMP(decomp_requests);
		QAT_STAT_INCR(decomp_total_in_bytes, src_len);

		buf_list_src->pBuffers->pData += ZLIB_HEAD_SZ;
		buf_list_src->pBuffers->dataLenInBytes -= ZLIB_HEAD_SZ;
		status = cpaDcDecompressData(dc_inst_handle, session_handle,
		    buf_list_src, buf_list_dst, &dc_results, CPA_DC_FLUSH_FINAL,
		    &complete);

		if (CPA_STATUS_SUCCESS != status) {
			status = CPA_STATUS_FAIL;
			goto fail;
		}

		/* we now wait until the completion of the operation. */
		wait_for_completion(&complete);

		if (dc_results.status != CPA_STATUS_SUCCESS) {
			status = CPA_STATUS_FAIL;
			goto fail;
		}

		/* verify adler checksum */
		adler32 = *(Cpa32U *)(src + dc_results.consumed + ZLIB_HEAD_SZ);
		if (adler32 != BSWAP_32(dc_results.checksum)) {
			status = CPA_STATUS_FAIL;
			goto fail;
		}
		*c_len = dc_results.produced;
		QAT_STAT_INCR(decomp_total_out_bytes, *c_len);
	}

fail:
	if (status != CPA_STATUS_SUCCESS && status != CPA_STATUS_INCOMPRESSIBLE)
		QAT_STAT_BUMP(dc_fails);

	if (in_pages) {
		for (page_num = 0;
		    page_num < buf_list_src->numBuffers;
		    page_num++) {
			kunmap(in_pages[page_num]);
		}
		QAT_PHYS_CONTIG_FREE(in_pages);
	}

	if (out_pages) {
		for (page_num = 0; page_num < dst_pages; page_num++) {
			kunmap(out_pages[page_num]);
		}
		QAT_PHYS_CONTIG_FREE(out_pages);
	}

	if (add_pages) {
		for (page_num = 0;
		    page_num < buf_list_dst->numBuffers - dst_pages;
		    page_num++) {
			kunmap(add_pages[page_num]);
		}
		QAT_PHYS_CONTIG_FREE(add_pages);
	}

	QAT_PHYS_CONTIG_FREE(buffer_meta_src);
	QAT_PHYS_CONTIG_FREE(buffer_meta_dst);
	QAT_PHYS_CONTIG_FREE(buf_list_src);
	QAT_PHYS_CONTIG_FREE(buf_list_dst);

	return (status);
}

/*
 * Entry point for QAT accelerated compression / decompression.
 */
int
qat_compress(qat_compress_dir_t dir, char *src, int src_len,
    char *dst, int dst_len, size_t *c_len)
{
	int ret;
	size_t add_len = 0;
	void *add = NULL;

	if (dir == QAT_COMPRESS) {
		add_len = dst_len;
		add = zio_data_buf_alloc(add_len);
	}

	ret = qat_compress_impl(dir, src, src_len, dst,
	    dst_len, add, add_len, c_len);

	if (dir == QAT_COMPRESS)
		zio_data_buf_free(add, add_len);

	return (ret);
}

static int
param_set_qat_compress(const char *val, zfs_kernel_param_t *kp)
{
	int ret;
	int *pvalue = kp->arg;
	ret = param_set_int(val, kp);
	if (ret)
		return (ret);
	/*
	 * zfs_qat_compress_disable = 0: enable qat compress
	 * try to initialize qat instance if it has not been done
	 */
	if (*pvalue == 0 && !qat_dc_init_done) {
		ret = qat_dc_init();
		if (ret != 0) {
			zfs_qat_compress_disable = 1;
			return (ret);
		}
	}
	return (ret);
}

module_param_call(zfs_qat_compress_disable, param_set_qat_compress,
    param_get_int, &zfs_qat_compress_disable, 0644);
MODULE_PARM_DESC(zfs_qat_compress_disable, "Enable/Disable QAT compression");

#endif
Commit	Line	Data
6a9d6359	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
1d3ba0bf	9	* or https://opensource.org/licenses/CDDL-1.0.
6a9d6359	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21
	22	#if defined(_KERNEL) && defined(HAVE_QAT)
	23	#include <linux/slab.h>
	24	#include <linux/vmalloc.h>
	25	#include <linux/pagemap.h>
	26	#include <linux/completion.h>
	27	#include <sys/zfs_context.h>
5090f727	28	#include <sys/byteorder.h>
32dce2da	29	#include <sys/zio.h>
7238cbd4	30	#include <sys/qat.h>
6a9d6359	31
6a9d6359	32	/*
8d9e7c8f TC	33	* Max instances in a QAT device, each instance is a channel to submit
	34	* jobs to QAT hardware, this is only for pre-allocating instance and
	35	* session arrays; the actual number of instances are defined in the
	36	* QAT driver's configuration file.
6a9d6359	37	*/
cf637391	38	#define QAT_DC_MAX_INSTANCES 48
6a9d6359	39
	40	/*
	41	* ZLIB head and foot size
	42	*/
	43	#define ZLIB_HEAD_SZ 2
	44	#define ZLIB_FOOT_SZ 4
	45
cf637391 TC	46	static CpaInstanceHandle dc_inst_handles[QAT_DC_MAX_INSTANCES];
	47	static CpaDcSessionHandle session_handles[QAT_DC_MAX_INSTANCES];
	48	static CpaBufferList **buffer_array[QAT_DC_MAX_INSTANCES];
1cfdb0e6	49	static Cpa16U num_inst = 0;
7a25f089	50	static Cpa32U inst_num = 0;
cf637391	51	static boolean_t qat_dc_init_done = B_FALSE;
38742209	52	int zfs_qat_compress_disable = 0;
6a9d6359	53
cf637391 TC	54	boolean_t
cf637391 TC	55	qat_dc_use_accel(size_t s_len)
6a9d6359	56	{
38742209	57	return (!zfs_qat_compress_disable &&
cf637391 TC	58	qat_dc_init_done &&
	59	s_len >= QAT_MIN_BUF_SIZE &&
	60	s_len <= QAT_MAX_BUF_SIZE);
6a9d6359	61	}
	62
	63	static void
	64	qat_dc_callback(void *p_callback, CpaStatus status)
	65	{
	66	if (p_callback != NULL)
	67	complete((struct completion *)p_callback);
	68	}
	69
6a9d6359	70	static void
cf637391	71	qat_dc_clean(void)
6a9d6359	72	{
	73	Cpa16U buff_num = 0;
	74	Cpa16U num_inter_buff_lists = 0;
6a9d6359	75
bc8a6a60	76	for (Cpa16U i = 0; i < num_inst; i++) {
6a9d6359	77	cpaDcStopInstance(dc_inst_handles[i]);
cf637391	78	QAT_PHYS_CONTIG_FREE(session_handles[i]);
6a9d6359	79	/* free intermediate buffers */
	80	if (buffer_array[i] != NULL) {
	81	cpaDcGetNumIntermediateBuffers(
	82	dc_inst_handles[i], &num_inter_buff_lists);
	83	for (buff_num = 0; buff_num < num_inter_buff_lists;
	84	buff_num++) {
	85	CpaBufferList *buffer_inter =
	86	buffer_array[i][buff_num];
	87	if (buffer_inter->pBuffers) {
cf637391	88	QAT_PHYS_CONTIG_FREE(
6a9d6359	89	buffer_inter->pBuffers->pData);
cf637391	90	QAT_PHYS_CONTIG_FREE(
6a9d6359	91	buffer_inter->pBuffers);
6a9d6359	92	}
cf637391	93	QAT_PHYS_CONTIG_FREE(
6a9d6359	94	buffer_inter->pPrivateMetaData);
cf637391	95	QAT_PHYS_CONTIG_FREE(buffer_inter);
6a9d6359	96	}
	97	}
	98	}
	99
	100	num_inst = 0;
cf637391	101	qat_dc_init_done = B_FALSE;
6a9d6359	102	}
	103
	104	int
cf637391	105	qat_dc_init(void)
6a9d6359	106	{
	107	CpaStatus status = CPA_STATUS_SUCCESS;
	108	Cpa32U sess_size = 0;
	109	Cpa32U ctx_size = 0;
	110	Cpa16U num_inter_buff_lists = 0;
	111	Cpa16U buff_num = 0;
	112	Cpa32U buff_meta_size = 0;
	113	CpaDcSessionSetupData sd = {0};
6a9d6359	114
5090f727 CZ	115	if (qat_dc_init_done)
	116	return (0);
	117
6a9d6359	118	status = cpaDcGetNumInstances(&num_inst);
cf637391	119	if (status != CPA_STATUS_SUCCESS)
6a9d6359	120	return (-1);
6a9d6359	121
cf637391 TC	122	/* if the user has configured no QAT compression units just return */
	123	if (num_inst == 0)
	124	return (0);
	125
	126	if (num_inst > QAT_DC_MAX_INSTANCES)
	127	num_inst = QAT_DC_MAX_INSTANCES;
6a9d6359	128
	129	status = cpaDcGetInstances(num_inst, &dc_inst_handles[0]);
	130	if (status != CPA_STATUS_SUCCESS)
	131	return (-1);
	132
bc8a6a60	133	for (Cpa16U i = 0; i < num_inst; i++) {
6a9d6359	134	cpaDcSetAddressTranslation(dc_inst_handles[i],
	135	(void*)virt_to_phys);
	136
	137	status = cpaDcBufferListGetMetaSize(dc_inst_handles[i],
	138	1, &buff_meta_size);
	139
	140	if (status == CPA_STATUS_SUCCESS)
	141	status = cpaDcGetNumIntermediateBuffers(
	142	dc_inst_handles[i], &num_inter_buff_lists);
	143
	144	if (status == CPA_STATUS_SUCCESS && num_inter_buff_lists != 0)
cf637391	145	status = QAT_PHYS_CONTIG_ALLOC(&buffer_array[i],
6a9d6359	146	num_inter_buff_lists *
	147	sizeof (CpaBufferList *));
	148
	149	for (buff_num = 0; buff_num < num_inter_buff_lists;
	150	buff_num++) {
	151	if (status == CPA_STATUS_SUCCESS)
cf637391	152	status = QAT_PHYS_CONTIG_ALLOC(
6a9d6359	153	&buffer_array[i][buff_num],
	154	sizeof (CpaBufferList));
	155
	156	if (status == CPA_STATUS_SUCCESS)
cf637391	157	status = QAT_PHYS_CONTIG_ALLOC(
6a9d6359	158	&buffer_array[i][buff_num]->
	159	pPrivateMetaData,
	160	buff_meta_size);
	161
	162	if (status == CPA_STATUS_SUCCESS)
cf637391	163	status = QAT_PHYS_CONTIG_ALLOC(
6a9d6359	164	&buffer_array[i][buff_num]->pBuffers,
	165	sizeof (CpaFlatBuffer));
	166
	167	if (status == CPA_STATUS_SUCCESS) {
	168	/*
	169	* implementation requires an intermediate
	170	* buffer approximately twice the size of
	171	* output buffer, which is 2x max buffer
	172	* size here.
	173	*/
cf637391	174	status = QAT_PHYS_CONTIG_ALLOC(
6a9d6359	175	&buffer_array[i][buff_num]->pBuffers->
	176	pData, 2 * QAT_MAX_BUF_SIZE);
	177	if (status != CPA_STATUS_SUCCESS)
	178	goto fail;
	179
	180	buffer_array[i][buff_num]->numBuffers = 1;
	181	buffer_array[i][buff_num]->pBuffers->
	182	dataLenInBytes = 2 * QAT_MAX_BUF_SIZE;
	183	}
	184	}
	185
	186	status = cpaDcStartInstance(dc_inst_handles[i],
	187	num_inter_buff_lists, buffer_array[i]);
	188	if (status != CPA_STATUS_SUCCESS)
	189	goto fail;
	190
	191	sd.compLevel = CPA_DC_L1;
	192	sd.compType = CPA_DC_DEFLATE;
	193	sd.huffType = CPA_DC_HT_FULL_DYNAMIC;
	194	sd.sessDirection = CPA_DC_DIR_COMBINED;
	195	sd.sessState = CPA_DC_STATELESS;
4da8c7d1	196	#if (CPA_DC_API_VERSION_NUM_MAJOR == 1 && CPA_DC_API_VERSION_NUM_MINOR < 6)
6a9d6359	197	sd.deflateWindowSize = 7;
4da8c7d1	198	#endif
6a9d6359	199	sd.checksum = CPA_DC_ADLER32;
	200	status = cpaDcGetSessionSize(dc_inst_handles[i],
	201	&sd, &sess_size, &ctx_size);
	202	if (status != CPA_STATUS_SUCCESS)
	203	goto fail;
	204
cf637391	205	QAT_PHYS_CONTIG_ALLOC(&session_handles[i], sess_size);
6a9d6359	206	if (session_handles[i] == NULL)
	207	goto fail;
	208
	209	status = cpaDcInitSession(dc_inst_handles[i],
	210	session_handles[i],
	211	&sd, NULL, qat_dc_callback);
	212	if (status != CPA_STATUS_SUCCESS)
	213	goto fail;
	214	}
	215
cf637391	216	qat_dc_init_done = B_TRUE;
6a9d6359	217	return (0);
6a9d6359	218	fail:
cf637391	219	qat_dc_clean();
6a9d6359	220	return (-1);
	221	}
	222
	223	void
cf637391	224	qat_dc_fini(void)
6a9d6359	225	{
cf637391 TC	226	if (!qat_dc_init_done)
cf637391 TC	227	return;
6a9d6359	228
cf637391	229	qat_dc_clean();
6a9d6359	230	}
6a9d6359	231
32dce2da TC	232	/*
	233	* The "add" parameter is an additional buffer which is passed
	234	* to QAT as a scratch buffer alongside the destination buffer
	235	* in case the "compressed" data ends up being larger than the
	236	* original source data. This is necessary to prevent QAT from
	237	* generating buffer overflow warnings for incompressible data.
	238	*/
	239	static int
	240	qat_compress_impl(qat_compress_dir_t dir, char *src, int src_len,
	241	char dst, int dst_len, char add, int add_len, size_t *c_len)
6a9d6359	242	{
	243	CpaInstanceHandle dc_inst_handle;
	244	CpaDcSessionHandle session_handle;
	245	CpaBufferList *buf_list_src = NULL;
	246	CpaBufferList *buf_list_dst = NULL;
	247	CpaFlatBuffer *flat_buf_src = NULL;
	248	CpaFlatBuffer *flat_buf_dst = NULL;
	249	Cpa8U *buffer_meta_src = NULL;
	250	Cpa8U *buffer_meta_dst = NULL;
	251	Cpa32U buffer_meta_size = 0;
60cfd3bb	252	CpaDcRqResults dc_results = {.checksum = 1};
bc9cef11	253	CpaStatus status = CPA_STATUS_FAIL;
6a9d6359	254	Cpa32U hdr_sz = 0;
6a9d6359	255	Cpa32U compressed_sz;
17dd8835 TC	256	Cpa32U num_src_buf = (src_len >> PAGE_SHIFT) + 2;
17dd8835 TC	257	Cpa32U num_dst_buf = (dst_len >> PAGE_SHIFT) + 2;
32dce2da	258	Cpa32U num_add_buf = (add_len >> PAGE_SHIFT) + 2;
6a9d6359	259	Cpa32U bytes_left;
32dce2da	260	Cpa32U dst_pages = 0;
5090f727	261	Cpa32U adler32 = 0;
6a9d6359	262	char *data;
32dce2da	263	struct page *page;
6a9d6359	264	struct page **in_pages = NULL;
6a9d6359	265	struct page **out_pages = NULL;
32dce2da	266	struct page **add_pages = NULL;
17dd8835	267	Cpa32U page_off = 0;
6a9d6359	268	struct completion complete;
17dd8835	269	Cpa32U page_num = 0;
6a9d6359	270	Cpa16U i;
6a9d6359	271
17dd8835 TC	272	/*
	273	* We increment num_src_buf and num_dst_buf by 2 to allow
	274	* us to handle non page-aligned buffer addresses and buffers
	275	* whose sizes are not divisible by PAGE_SIZE.
	276	*/
6a9d6359	277	Cpa32U src_buffer_list_mem_size = sizeof (CpaBufferList) +
	278	(num_src_buf * sizeof (CpaFlatBuffer));
	279	Cpa32U dst_buffer_list_mem_size = sizeof (CpaBufferList) +
32dce2da	280	((num_dst_buf + num_add_buf) * sizeof (CpaFlatBuffer));
6a9d6359	281
bc9cef11 BB	282	status = QAT_PHYS_CONTIG_ALLOC(&in_pages,
	283	num_src_buf * sizeof (struct page *));
	284	if (status != CPA_STATUS_SUCCESS)
6a9d6359	285	goto fail;
6a9d6359	286
bc9cef11 BB	287	status = QAT_PHYS_CONTIG_ALLOC(&out_pages,
	288	num_dst_buf * sizeof (struct page *));
	289	if (status != CPA_STATUS_SUCCESS)
6a9d6359	290	goto fail;
6a9d6359	291
bc9cef11 BB	292	status = QAT_PHYS_CONTIG_ALLOC(&add_pages,
	293	num_add_buf * sizeof (struct page *));
	294	if (status != CPA_STATUS_SUCCESS)
32dce2da TC	295	goto fail;
32dce2da TC	296
bc8a6a60	297	i = (Cpa32U)atomic_inc_32_nv(&inst_num) % num_inst;
6a9d6359	298	dc_inst_handle = dc_inst_handles[i];
	299	session_handle = session_handles[i];
	300
	301	cpaDcBufferListGetMetaSize(dc_inst_handle, num_src_buf,
	302	&buffer_meta_size);
bc9cef11 BB	303	status = QAT_PHYS_CONTIG_ALLOC(&buffer_meta_src, buffer_meta_size);
bc9cef11 BB	304	if (status != CPA_STATUS_SUCCESS)
6a9d6359	305	goto fail;
6a9d6359	306
32dce2da	307	cpaDcBufferListGetMetaSize(dc_inst_handle, num_dst_buf + num_add_buf,
6a9d6359	308	&buffer_meta_size);
bc9cef11 BB	309	status = QAT_PHYS_CONTIG_ALLOC(&buffer_meta_dst, buffer_meta_size);
bc9cef11 BB	310	if (status != CPA_STATUS_SUCCESS)
6a9d6359	311	goto fail;
	312
	313	/* build source buffer list */
bc9cef11 BB	314	status = QAT_PHYS_CONTIG_ALLOC(&buf_list_src, src_buffer_list_mem_size);
bc9cef11 BB	315	if (status != CPA_STATUS_SUCCESS)
6a9d6359	316	goto fail;
	317
	318	flat_buf_src = (CpaFlatBuffer *)(buf_list_src + 1);
	319
	320	buf_list_src->pBuffers = flat_buf_src; /* always point to first one */
	321
	322	/* build destination buffer list */
bc9cef11 BB	323	status = QAT_PHYS_CONTIG_ALLOC(&buf_list_dst, dst_buffer_list_mem_size);
bc9cef11 BB	324	if (status != CPA_STATUS_SUCCESS)
6a9d6359	325	goto fail;
	326
	327	flat_buf_dst = (CpaFlatBuffer *)(buf_list_dst + 1);
	328
	329	buf_list_dst->pBuffers = flat_buf_dst; /* always point to first one */
	330
	331	buf_list_src->numBuffers = 0;
	332	buf_list_src->pPrivateMetaData = buffer_meta_src;
	333	bytes_left = src_len;
	334	data = src;
	335	page_num = 0;
	336	while (bytes_left > 0) {
17dd8835	337	page_off = ((long)data & ~PAGE_MASK);
32dce2da TC	338	page = qat_mem_to_page(data);
	339	in_pages[page_num] = page;
	340	flat_buf_src->pData = kmap(page) + page_off;
6a9d6359	341	flat_buf_src->dataLenInBytes =
17dd8835	342	min((long)PAGE_SIZE - page_off, (long)bytes_left);
6a9d6359	343
	344	bytes_left -= flat_buf_src->dataLenInBytes;
	345	data += flat_buf_src->dataLenInBytes;
	346	flat_buf_src++;
	347	buf_list_src->numBuffers++;
	348	page_num++;
	349	}
	350
	351	buf_list_dst->numBuffers = 0;
	352	buf_list_dst->pPrivateMetaData = buffer_meta_dst;
	353	bytes_left = dst_len;
	354	data = dst;
	355	page_num = 0;
	356	while (bytes_left > 0) {
17dd8835	357	page_off = ((long)data & ~PAGE_MASK);
32dce2da TC	358	page = qat_mem_to_page(data);
	359	flat_buf_dst->pData = kmap(page) + page_off;
	360	out_pages[page_num] = page;
	361	flat_buf_dst->dataLenInBytes =
	362	min((long)PAGE_SIZE - page_off, (long)bytes_left);
	363
	364	bytes_left -= flat_buf_dst->dataLenInBytes;
	365	data += flat_buf_dst->dataLenInBytes;
	366	flat_buf_dst++;
	367	buf_list_dst->numBuffers++;
	368	page_num++;
	369	dst_pages++;
	370	}
	371
	372	/* map additional scratch pages into the destination buffer list */
	373	bytes_left = add_len;
	374	data = add;
	375	page_num = 0;
	376	while (bytes_left > 0) {
	377	page_off = ((long)data & ~PAGE_MASK);
	378	page = qat_mem_to_page(data);
	379	flat_buf_dst->pData = kmap(page) + page_off;
	380	add_pages[page_num] = page;
6a9d6359	381	flat_buf_dst->dataLenInBytes =
17dd8835	382	min((long)PAGE_SIZE - page_off, (long)bytes_left);
6a9d6359	383
	384	bytes_left -= flat_buf_dst->dataLenInBytes;
	385	data += flat_buf_dst->dataLenInBytes;
	386	flat_buf_dst++;
	387	buf_list_dst->numBuffers++;
	388	page_num++;
	389	}
	390
	391	init_completion(&complete);
	392
	393	if (dir == QAT_COMPRESS) {
	394	QAT_STAT_BUMP(comp_requests);
	395	QAT_STAT_INCR(comp_total_in_bytes, src_len);
	396
	397	cpaDcGenerateHeader(session_handle,
	398	buf_list_dst->pBuffers, &hdr_sz);
	399	buf_list_dst->pBuffers->pData += hdr_sz;
	400	buf_list_dst->pBuffers->dataLenInBytes -= hdr_sz;
	401	status = cpaDcCompressData(
	402	dc_inst_handle, session_handle,
	403	buf_list_src, buf_list_dst,
	404	&dc_results, CPA_DC_FLUSH_FINAL,
	405	&complete);
	406	if (status != CPA_STATUS_SUCCESS) {
	407	goto fail;
	408	}
	409
	410	/* we now wait until the completion of the operation. */
7238cbd4	411	wait_for_completion(&complete);
6a9d6359	412
	413	if (dc_results.status != CPA_STATUS_SUCCESS) {
	414	status = CPA_STATUS_FAIL;
	415	goto fail;
	416	}
	417
	418	compressed_sz = dc_results.produced;
	419	if (compressed_sz + hdr_sz + ZLIB_FOOT_SZ > dst_len) {
32dce2da	420	status = CPA_STATUS_INCOMPRESSIBLE;
6a9d6359	421	goto fail;
	422	}
	423
43575527	424	/* get adler32 checksum and append footer */
	425	(Cpa32U)(dst + hdr_sz + compressed_sz) =
	426	BSWAP_32(dc_results.checksum);
6a9d6359	427
43575527	428	*c_len = hdr_sz + compressed_sz + ZLIB_FOOT_SZ;
6a9d6359	429	QAT_STAT_INCR(comp_total_out_bytes, *c_len);
cf637391 TC	430	} else {
cf637391 TC	431	ASSERT3U(dir, ==, QAT_DECOMPRESS);
6a9d6359	432	QAT_STAT_BUMP(decomp_requests);
	433	QAT_STAT_INCR(decomp_total_in_bytes, src_len);
	434
	435	buf_list_src->pBuffers->pData += ZLIB_HEAD_SZ;
	436	buf_list_src->pBuffers->dataLenInBytes -= ZLIB_HEAD_SZ;
32dce2da TC	437	status = cpaDcDecompressData(dc_inst_handle, session_handle,
32dce2da TC	438	buf_list_src, buf_list_dst, &dc_results, CPA_DC_FLUSH_FINAL,
6a9d6359	439	&complete);
	440
	441	if (CPA_STATUS_SUCCESS != status) {
	442	status = CPA_STATUS_FAIL;
	443	goto fail;
	444	}
	445
	446	/* we now wait until the completion of the operation. */
7238cbd4	447	wait_for_completion(&complete);
6a9d6359	448
	449	if (dc_results.status != CPA_STATUS_SUCCESS) {
	450	status = CPA_STATUS_FAIL;
	451	goto fail;
	452	}
	453
5090f727 CZ	454	/* verify adler checksum */
	455	adler32 = (Cpa32U )(src + dc_results.consumed + ZLIB_HEAD_SZ);
	456	if (adler32 != BSWAP_32(dc_results.checksum)) {
	457	status = CPA_STATUS_FAIL;
	458	goto fail;
	459	}
6a9d6359	460	*c_len = dc_results.produced;
6a9d6359	461	QAT_STAT_INCR(decomp_total_out_bytes, *c_len);
6a9d6359	462	}
	463
	464	fail:
32dce2da	465	if (status != CPA_STATUS_SUCCESS && status != CPA_STATUS_INCOMPRESSIBLE)
6a9d6359	466	QAT_STAT_BUMP(dc_fails);
6a9d6359	467
	468	if (in_pages) {
	469	for (page_num = 0;
	470	page_num < buf_list_src->numBuffers;
	471	page_num++) {
	472	kunmap(in_pages[page_num]);
	473	}
cf637391	474	QAT_PHYS_CONTIG_FREE(in_pages);
6a9d6359	475	}
	476
	477	if (out_pages) {
32dce2da	478	for (page_num = 0; page_num < dst_pages; page_num++) {
6a9d6359	479	kunmap(out_pages[page_num]);
6a9d6359	480	}
cf637391	481	QAT_PHYS_CONTIG_FREE(out_pages);
6a9d6359	482	}
6a9d6359	483
32dce2da TC	484	if (add_pages) {
	485	for (page_num = 0;
	486	page_num < buf_list_dst->numBuffers - dst_pages;
	487	page_num++) {
	488	kunmap(add_pages[page_num]);
	489	}
	490	QAT_PHYS_CONTIG_FREE(add_pages);
	491	}
	492
cf637391 TC	493	QAT_PHYS_CONTIG_FREE(buffer_meta_src);
	494	QAT_PHYS_CONTIG_FREE(buffer_meta_dst);
	495	QAT_PHYS_CONTIG_FREE(buf_list_src);
	496	QAT_PHYS_CONTIG_FREE(buf_list_dst);
6a9d6359	497
32dce2da TC	498	return (status);
	499	}
	500
	501	/*
	502	* Entry point for QAT accelerated compression / decompression.
	503	*/
	504	int
	505	qat_compress(qat_compress_dir_t dir, char *src, int src_len,
	506	char dst, int dst_len, size_t c_len)
	507	{
	508	int ret;
	509	size_t add_len = 0;
	510	void *add = NULL;
	511
	512	if (dir == QAT_COMPRESS) {
	513	add_len = dst_len;
	514	add = zio_data_buf_alloc(add_len);
	515	}
	516
	517	ret = qat_compress_impl(dir, src, src_len, dst,
	518	dst_len, add, add_len, c_len);
	519
	520	if (dir == QAT_COMPRESS)
	521	zio_data_buf_free(add, add_len);
	522
6a9d6359	523	return (ret);
	524	}
	525
5090f727	526	static int
6988f3ed	527	param_set_qat_compress(const char val, zfs_kernel_param_t kp)
5090f727 CZ	528	{
	529	int ret;
	530	int *pvalue = kp->arg;
	531	ret = param_set_int(val, kp);
	532	if (ret)
	533	return (ret);
	534	/*
	535	* zfs_qat_compress_disable = 0: enable qat compress
	536	* try to initialize qat instance if it has not been done
	537	*/
	538	if (*pvalue == 0 && !qat_dc_init_done) {
	539	ret = qat_dc_init();
	540	if (ret != 0) {
	541	zfs_qat_compress_disable = 1;
	542	return (ret);
	543	}
	544	}
	545	return (ret);
	546	}
	547
	548	module_param_call(zfs_qat_compress_disable, param_set_qat_compress,
	549	param_get_int, &zfs_qat_compress_disable, 0644);
	550	MODULE_PARM_DESC(zfs_qat_compress_disable, "Enable/Disable QAT compression");
38742209	551
6a9d6359	552	#endif