qat_compression.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/* Copyright(c) 2022 Intel Corporation */
  3#include <linux/module.h>
  4#include <linux/slab.h>
  5#include "adf_accel_devices.h"
  6#include "adf_common_drv.h"
  7#include "adf_transport.h"
  8#include "adf_transport_access_macros.h"
  9#include "adf_cfg.h"
 10#include "adf_cfg_strings.h"
 11#include "qat_compression.h"
 12#include "icp_qat_fw.h"
 13
 14#define SEC ADF_KERNEL_SEC
 15
 16static struct service_hndl qat_compression;
 17
 18void qat_compression_put_instance(struct qat_compression_instance *inst)
 19{
 20	atomic_dec(&inst->refctr);
 21	adf_dev_put(inst->accel_dev);
 22}
 23
 24static int qat_compression_free_instances(struct adf_accel_dev *accel_dev)
 25{
 26	struct qat_compression_instance *inst;
 27	struct list_head *list_ptr, *tmp;
 28	int i;
 29
 30	list_for_each_safe(list_ptr, tmp, &accel_dev->compression_list) {
 31		inst = list_entry(list_ptr,
 32				  struct qat_compression_instance, list);
 33
 34		for (i = 0; i < atomic_read(&inst->refctr); i++)
 35			qat_compression_put_instance(inst);
 36
 37		if (inst->dc_tx)
 38			adf_remove_ring(inst->dc_tx);
 39
 40		if (inst->dc_rx)
 41			adf_remove_ring(inst->dc_rx);
 42
 43		list_del(list_ptr);
 44		kfree(inst);
 45	}
 46	return 0;
 47}
 48
 49struct qat_compression_instance *qat_compression_get_instance_node(int node)
 50{
 51	struct qat_compression_instance *inst = NULL;
 52	struct adf_accel_dev *accel_dev = NULL;
 53	unsigned long best = ~0;
 54	struct list_head *itr;
 55
 56	list_for_each(itr, adf_devmgr_get_head()) {
 57		struct adf_accel_dev *tmp_dev;
 58		unsigned long ctr;
 59		int tmp_dev_node;
 60
 61		tmp_dev = list_entry(itr, struct adf_accel_dev, list);
 62		tmp_dev_node = dev_to_node(&GET_DEV(tmp_dev));
 63
 64		if ((node == tmp_dev_node || tmp_dev_node < 0) &&
 65		    adf_dev_started(tmp_dev) && !list_empty(&tmp_dev->compression_list)) {
 66			ctr = atomic_read(&tmp_dev->ref_count);
 67			if (best > ctr) {
 68				accel_dev = tmp_dev;
 69				best = ctr;
 70			}
 71		}
 72	}
 73
 74	if (!accel_dev) {
 75		pr_debug_ratelimited("QAT: Could not find a device on node %d\n", node);
 76		/* Get any started device */
 77		list_for_each(itr, adf_devmgr_get_head()) {
 78			struct adf_accel_dev *tmp_dev;
 79
 80			tmp_dev = list_entry(itr, struct adf_accel_dev, list);
 81			if (adf_dev_started(tmp_dev) &&
 82			    !list_empty(&tmp_dev->compression_list)) {
 83				accel_dev = tmp_dev;
 84				break;
 85			}
 86		}
 87	}
 88
 89	if (!accel_dev)
 90		return NULL;
 91
 92	best = ~0;
 93	list_for_each(itr, &accel_dev->compression_list) {
 94		struct qat_compression_instance *tmp_inst;
 95		unsigned long ctr;
 96
 97		tmp_inst = list_entry(itr, struct qat_compression_instance, list);
 98		ctr = atomic_read(&tmp_inst->refctr);
 99		if (best > ctr) {
100			inst = tmp_inst;
101			best = ctr;
102		}
103	}
104	if (inst) {
105		if (adf_dev_get(accel_dev)) {
106			dev_err(&GET_DEV(accel_dev), "Could not increment dev refctr\n");
107			return NULL;
108		}
109		atomic_inc(&inst->refctr);
110	}
111	return inst;
112}
113
114static int qat_compression_create_instances(struct adf_accel_dev *accel_dev)
115{
116	struct qat_compression_instance *inst;
117	char key[ADF_CFG_MAX_KEY_LEN_IN_BYTES];
118	char val[ADF_CFG_MAX_VAL_LEN_IN_BYTES];
119	unsigned long num_inst, num_msg_dc;
120	unsigned long bank;
121	int msg_size;
122	int ret;
123	int i;
124
125	INIT_LIST_HEAD(&accel_dev->compression_list);
126	strscpy(key, ADF_NUM_DC, sizeof(key));
127	ret = adf_cfg_get_param_value(accel_dev, SEC, key, val);
128	if (ret)
129		return ret;
130
131	ret = kstrtoul(val, 10, &num_inst);
132	if (ret)
133		return ret;
134
135	for (i = 0; i < num_inst; i++) {
136		inst = kzalloc_node(sizeof(*inst), GFP_KERNEL,
137				    dev_to_node(&GET_DEV(accel_dev)));
138		if (!inst) {
139			ret = -ENOMEM;
140			goto err;
141		}
142
143		list_add_tail(&inst->list, &accel_dev->compression_list);
144		inst->id = i;
145		atomic_set(&inst->refctr, 0);
146		inst->accel_dev = accel_dev;
147
148		snprintf(key, sizeof(key), ADF_DC "%d" ADF_RING_DC_BANK_NUM, i);
149		ret = adf_cfg_get_param_value(accel_dev, SEC, key, val);
150		if (ret)
151			return ret;
152
153		ret = kstrtoul(val, 10, &bank);
154		if (ret)
155			return ret;
156
157		snprintf(key, sizeof(key), ADF_DC "%d" ADF_RING_DC_SIZE, i);
158		ret = adf_cfg_get_param_value(accel_dev, SEC, key, val);
159		if (ret)
160			return ret;
161
162		ret = kstrtoul(val, 10, &num_msg_dc);
163		if (ret)
164			return ret;
165
166		msg_size = ICP_QAT_FW_REQ_DEFAULT_SZ;
167		snprintf(key, sizeof(key), ADF_DC "%d" ADF_RING_DC_TX, i);
168		ret = adf_create_ring(accel_dev, SEC, bank, num_msg_dc,
169				      msg_size, key, NULL, 0, &inst->dc_tx);
170		if (ret)
171			return ret;
172
173		msg_size = ICP_QAT_FW_RESP_DEFAULT_SZ;
174		snprintf(key, sizeof(key), ADF_DC "%d" ADF_RING_DC_RX, i);
175		ret = adf_create_ring(accel_dev, SEC, bank, num_msg_dc,
176				      msg_size, key, qat_comp_alg_callback, 0,
177				      &inst->dc_rx);
178		if (ret)
179			return ret;
180
181		inst->dc_data = accel_dev->dc_data;
182		INIT_LIST_HEAD(&inst->backlog.list);
183		spin_lock_init(&inst->backlog.lock);
184	}
185	return 0;
186err:
187	qat_compression_free_instances(accel_dev);
188	return ret;
189}
190
191static int qat_compression_alloc_dc_data(struct adf_accel_dev *accel_dev)
192{
193	struct device *dev = &GET_DEV(accel_dev);
194	dma_addr_t obuff_p = DMA_MAPPING_ERROR;
195	size_t ovf_buff_sz = QAT_COMP_MAX_SKID;
196	struct adf_dc_data *dc_data = NULL;
197	u8 *obuff = NULL;
198
199	dc_data = kzalloc_node(sizeof(*dc_data), GFP_KERNEL, dev_to_node(dev));
200	if (!dc_data)
201		goto err;
202
203	obuff = kzalloc_node(ovf_buff_sz, GFP_KERNEL, dev_to_node(dev));
204	if (!obuff)
205		goto err;
206
207	obuff_p = dma_map_single(dev, obuff, ovf_buff_sz, DMA_BIDIRECTIONAL);
208	if (unlikely(dma_mapping_error(dev, obuff_p)))
209		goto err;
210
211	dc_data->ovf_buff = obuff;
212	dc_data->ovf_buff_p = obuff_p;
213	dc_data->ovf_buff_sz = ovf_buff_sz;
214
215	accel_dev->dc_data = dc_data;
216
217	return 0;
218
219err:
220	accel_dev->dc_data = NULL;
221	kfree(obuff);
222	devm_kfree(dev, dc_data);
223	return -ENOMEM;
224}
225
226static void qat_free_dc_data(struct adf_accel_dev *accel_dev)
227{
228	struct adf_dc_data *dc_data = accel_dev->dc_data;
229	struct device *dev = &GET_DEV(accel_dev);
230
231	if (!dc_data)
232		return;
233
234	dma_unmap_single(dev, dc_data->ovf_buff_p, dc_data->ovf_buff_sz,
235			 DMA_BIDIRECTIONAL);
236	kfree_sensitive(dc_data->ovf_buff);
237	kfree(dc_data);
238	accel_dev->dc_data = NULL;
239}
240
241static int qat_compression_init(struct adf_accel_dev *accel_dev)
242{
243	int ret;
244
245	ret = qat_compression_alloc_dc_data(accel_dev);
246	if (ret)
247		return ret;
248
249	ret = qat_compression_create_instances(accel_dev);
250	if (ret)
251		qat_free_dc_data(accel_dev);
252
253	return ret;
254}
255
256static int qat_compression_shutdown(struct adf_accel_dev *accel_dev)
257{
258	qat_free_dc_data(accel_dev);
259	return qat_compression_free_instances(accel_dev);
260}
261
262static int qat_compression_event_handler(struct adf_accel_dev *accel_dev,
263					 enum adf_event event)
264{
265	int ret;
266
267	switch (event) {
268	case ADF_EVENT_INIT:
269		ret = qat_compression_init(accel_dev);
270		break;
271	case ADF_EVENT_SHUTDOWN:
272		ret = qat_compression_shutdown(accel_dev);
273		break;
274	case ADF_EVENT_RESTARTING:
275	case ADF_EVENT_RESTARTED:
276	case ADF_EVENT_START:
277	case ADF_EVENT_STOP:
278	default:
279		ret = 0;
280	}
281	return ret;
282}
283
284int qat_compression_register(void)
285{
286	memset(&qat_compression, 0, sizeof(qat_compression));
287	qat_compression.event_hld = qat_compression_event_handler;
288	qat_compression.name = "qat_compression";
289	return adf_service_register(&qat_compression);
290}
291
292int qat_compression_unregister(void)
293{
294	return adf_service_unregister(&qat_compression);
295}