summaryrefslogtreecommitdiffstats
path: root/arch/s390/pci/pci_clp.c
blob: 96545d7659fd0d30060a96a7dbb5e2e368aa9eba (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
/*
 * Copyright IBM Corp. 2012
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 */

#define COMPONENT "zPCI"
#define pr_fmt(fmt) COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/pci.h>
#include <asm/pci_debug.h>
#include <asm/pci_clp.h>

static inline void zpci_err_clp(unsigned int rsp, int rc)
{
	struct {
		unsigned int rsp;
		int rc;
	} __packed data = {rsp, rc};

	zpci_err_hex(&data, sizeof(data));
}

/*
 * Call Logical Processor
 * Retry logic is handled by the caller.
 */
static inline u8 clp_instr(void *data)
{
	struct { u8 _[CLP_BLK_SIZE]; } *req = data;
	u64 ignored;
	u8 cc;

	asm volatile (
		"	.insn	rrf,0xb9a00000,%[ign],%[req],0x0,0x2\n"
		"	ipm	%[cc]\n"
		"	srl	%[cc],28\n"
		: [cc] "=d" (cc), [ign] "=d" (ignored), "+m" (*req)
		: [req] "a" (req)
		: "cc");
	return cc;
}

static void *clp_alloc_block(gfp_t gfp_mask)
{
	return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
}

static void clp_free_block(void *ptr)
{
	free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
}

static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
				      struct clp_rsp_query_pci_grp *response)
{
	zdev->tlb_refresh = response->refresh;
	zdev->dma_mask = response->dasm;
	zdev->msi_addr = response->msia;
	zdev->fmb_update = response->mui;

	switch (response->version) {
	case 1:
		zdev->max_bus_speed = PCIE_SPEED_5_0GT;
		break;
	default:
		zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
		break;
	}
}

static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
{
	struct clp_req_rsp_query_pci_grp *rrb;
	int rc;

	rrb = clp_alloc_block(GFP_KERNEL);
	if (!rrb)
		return -ENOMEM;

	memset(rrb, 0, sizeof(*rrb));
	rrb->request.hdr.len = sizeof(rrb->request);
	rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
	rrb->response.hdr.len = sizeof(rrb->response);
	rrb->request.pfgid = pfgid;

	rc = clp_instr(rrb);
	if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
		clp_store_query_pci_fngrp(zdev, &rrb->response);
	else {
		zpci_err("Q PCI FGRP:\n");
		zpci_err_clp(rrb->response.hdr.rsp, rc);
		rc = -EIO;
	}
	clp_free_block(rrb);
	return rc;
}

static int clp_store_query_pci_fn(struct zpci_dev *zdev,
				  struct clp_rsp_query_pci *response)
{
	int i;

	for (i = 0; i < PCI_BAR_COUNT; i++) {
		zdev->bars[i].val = le32_to_cpu(response->bar[i]);
		zdev->bars[i].size = response->bar_size[i];
	}
	zdev->start_dma = response->sdma;
	zdev->end_dma = response->edma;
	zdev->pchid = response->pchid;
	zdev->pfgid = response->pfgid;
	zdev->pft = response->pft;
	zdev->vfn = response->vfn;
	zdev->uid = response->uid;

	memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
	if (response->util_str_avail) {
		memcpy(zdev->util_str, response->util_str,
		       sizeof(zdev->util_str));
	}

	return 0;
}

static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
{
	struct clp_req_rsp_query_pci *rrb;
	int rc;

	rrb = clp_alloc_block(GFP_KERNEL);
	if (!rrb)
		return -ENOMEM;

	memset(rrb, 0, sizeof(*rrb));
	rrb->request.hdr.len = sizeof(rrb->request);
	rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
	rrb->response.hdr.len = sizeof(rrb->response);
	rrb->request.fh = fh;

	rc = clp_instr(rrb);
	if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
		rc = clp_store_query_pci_fn(zdev, &rrb->response);
		if (rc)
			goto out;
		if (rrb->response.pfgid)
			rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
	} else {
		zpci_err("Q PCI FN:\n");
		zpci_err_clp(rrb->response.hdr.rsp, rc);
		rc = -EIO;
	}
out:
	clp_free_block(rrb);
	return rc;
}

int clp_add_pci_device(u32 fid, u32 fh, int configured)
{
	struct zpci_dev *zdev;
	int rc;

	zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
	zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
	if (!zdev)
		return -ENOMEM;

	zdev->fh = fh;
	zdev->fid = fid;

	/* Query function properties and update zdev */
	rc = clp_query_pci_fn(zdev, fh);
	if (rc)
		goto error;

	if (configured)
		zdev->state = ZPCI_FN_STATE_CONFIGURED;
	else
		zdev->state = ZPCI_FN_STATE_STANDBY;

	rc = zpci_create_device(zdev);
	if (rc)
		goto error;
	return 0;

error:
	kfree(zdev);
	return rc;
}

/*
 * Enable/Disable a given PCI function defined by its function handle.
 */
static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
{
	struct clp_req_rsp_set_pci *rrb;
	int rc, retries = 100;

	rrb = clp_alloc_block(GFP_KERNEL);
	if (!rrb)
		return -ENOMEM;

	do {
		memset(rrb, 0, sizeof(*rrb));
		rrb->request.hdr.len = sizeof(rrb->request);
		rrb->request.hdr.cmd = CLP_SET_PCI_FN;
		rrb->response.hdr.len = sizeof(rrb->response);
		rrb->request.fh = *fh;
		rrb->request.oc = command;
		rrb->request.ndas = nr_dma_as;

		rc = clp_instr(rrb);
		if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
			retries--;
			if (retries < 0)
				break;
			msleep(20);
		}
	} while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);

	if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
		*fh = rrb->response.fh;
	else {
		zpci_err("Set PCI FN:\n");
		zpci_err_clp(rrb->response.hdr.rsp, rc);
		rc = -EIO;
	}
	clp_free_block(rrb);
	return rc;
}

int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
{
	u32 fh = zdev->fh;
	int rc;

	rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
	if (!rc)
		/* Success -> store enabled handle in zdev */
		zdev->fh = fh;

	zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
	return rc;
}

int clp_disable_fh(struct zpci_dev *zdev)
{
	u32 fh = zdev->fh;
	int rc;

	if (!zdev_enabled(zdev))
		return 0;

	rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
	if (!rc)
		/* Success -> store disabled handle in zdev */
		zdev->fh = fh;

	zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
	return rc;
}

static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
			void (*cb)(struct clp_fh_list_entry *entry))
{
	u64 resume_token = 0;
	int entries, i, rc;

	do {
		memset(rrb, 0, sizeof(*rrb));
		rrb->request.hdr.len = sizeof(rrb->request);
		rrb->request.hdr.cmd = CLP_LIST_PCI;
		/* store as many entries as possible */
		rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
		rrb->request.resume_token = resume_token;

		/* Get PCI function handle list */
		rc = clp_instr(rrb);
		if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
			zpci_err("List PCI FN:\n");
			zpci_err_clp(rrb->response.hdr.rsp, rc);
			rc = -EIO;
			goto out;
		}

		WARN_ON_ONCE(rrb->response.entry_size !=
			sizeof(struct clp_fh_list_entry));

		entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
			rrb->response.entry_size;

		resume_token = rrb->response.resume_token;
		for (i = 0; i < entries; i++)
			cb(&rrb->response.fh_list[i]);
	} while (resume_token);
out:
	return rc;
}

static void __clp_add(struct clp_fh_list_entry *entry)
{
	if (!entry->vendor_id)
		return;

	clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
}

static void __clp_rescan(struct clp_fh_list_entry *entry)
{
	struct zpci_dev *zdev;

	if (!entry->vendor_id)
		return;

	zdev = get_zdev_by_fid(entry->fid);
	if (!zdev) {
		clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
		return;
	}

	if (!entry->config_state) {
		/*
		 * The handle is already disabled, that means no iota/irq freeing via
		 * the firmware interfaces anymore. Need to free resources manually
		 * (DMA memory, debug, sysfs)...
		 */
		zpci_stop_device(zdev);
	}
}

static void __clp_update(struct clp_fh_list_entry *entry)
{
	struct zpci_dev *zdev;

	if (!entry->vendor_id)
		return;

	zdev = get_zdev_by_fid(entry->fid);
	if (!zdev)
		return;

	zdev->fh = entry->fh;
}

int clp_scan_pci_devices(void)
{
	struct clp_req_rsp_list_pci *rrb;
	int rc;

	rrb = clp_alloc_block(GFP_KERNEL);
	if (!rrb)
		return -ENOMEM;

	rc = clp_list_pci(rrb, __clp_add);

	clp_free_block(rrb);
	return rc;
}

int clp_rescan_pci_devices(void)
{
	struct clp_req_rsp_list_pci *rrb;
	int rc;

	rrb = clp_alloc_block(GFP_KERNEL);
	if (!rrb)
		return -ENOMEM;

	rc = clp_list_pci(rrb, __clp_rescan);

	clp_free_block(rrb);
	return rc;
}

int clp_rescan_pci_devices_simple(void)
{
	struct clp_req_rsp_list_pci *rrb;
	int rc;

	rrb = clp_alloc_block(GFP_NOWAIT);
	if (!rrb)
		return -ENOMEM;

	rc = clp_list_pci(rrb, __clp_update);

	clp_free_block(rrb);
	return rc;
}
OpenPOWER on IntegriCloud