aboutsummaryrefslogtreecommitdiff
path: root/arch/alpha/kernel/pci-sysfs.c
blob: 738fc824e2ea373f85b3ae04fb7eb1346ecacdac (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
/*
 * arch/alpha/kernel/pci-sysfs.c
 *
 * Copyright (C) 2009 Ivan Kokshaysky
 *
 * Alpha PCI resource files.
 *
 * Loosely based on generic HAVE_PCI_MMAP implementation in
 * drivers/pci/pci-sysfs.c
 */

#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/pci.h>

static int hose_mmap_page_range(struct pci_controller *hose,
				struct vm_area_struct *vma,
				enum pci_mmap_state mmap_type, int sparse)
{
	unsigned long base;

	if (mmap_type == pci_mmap_mem)
		base = sparse ? hose->sparse_mem_base : hose->dense_mem_base;
	else
		base = sparse ? hose->sparse_io_base : hose->dense_io_base;

	vma->vm_pgoff += base >> PAGE_SHIFT;
	vma->vm_flags |= (VM_IO | VM_RESERVED);

	return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
				  vma->vm_end - vma->vm_start,
				  vma->vm_page_prot);
}

static int __pci_mmap_fits(struct pci_dev *pdev, int num,
			   struct vm_area_struct *vma, int sparse)
{
	unsigned long nr, start, size;
	int shift = sparse ? 5 : 0;

	nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	start = vma->vm_pgoff;
	size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1;

	if (start < size && size - start >= nr)
		return 1;
	WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d "
		"(size 0x%08lx)\n",
		current->comm, sparse ? " sparse" : "", start, start + nr,
		pci_name(pdev), num, size);
	return 0;
}

/**
 * pci_mmap_resource - map a PCI resource into user memory space
 * @kobj: kobject for mapping
 * @attr: struct bin_attribute for the file being mapped
 * @vma: struct vm_area_struct passed into the mmap
 * @sparse: address space type
 *
 * Use the bus mapping routines to map a PCI resource into userspace.
 */
static int pci_mmap_resource(struct kobject *kobj,
			     struct bin_attribute *attr,
			     struct vm_area_struct *vma, int sparse)
{
	struct pci_dev *pdev = to_pci_dev(container_of(kobj,
						       struct device, kobj));
	struct resource *res = (struct resource *)attr->private;
	enum pci_mmap_state mmap_type;
	struct pci_bus_region bar;
	int i;

	for (i = 0; i < PCI_ROM_RESOURCE; i++)
		if (res == &pdev->resource[i])
			break;
	if (i >= PCI_ROM_RESOURCE)
		return -ENODEV;

	if (!__pci_mmap_fits(pdev, i, vma, sparse))
		return -EINVAL;

	if (iomem_is_exclusive(res->start))
		return -EINVAL;

	pcibios_resource_to_bus(pdev, &bar, res);
	vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0));
	mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io;

	return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse);
}

static int pci_mmap_resource_sparse(struct file *filp, struct kobject *kobj,
				    struct bin_attribute *attr,
				    struct vm_area_struct *vma)
{
	return pci_mmap_resource(kobj, attr, vma, 1);
}

static int pci_mmap_resource_dense(struct file *filp, struct kobject *kobj,
				   struct bin_attribute *attr,
				   struct vm_area_struct *vma)
{
	return pci_mmap_resource(kobj, attr, vma, 0);
}

/**
 * pci_remove_resource_files - cleanup resource files
 * @dev: dev to cleanup
 *
 * If we created resource files for @dev, remove them from sysfs and
 * free their resources.
 */
void pci_remove_resource_files(struct pci_dev *pdev)
{
	int i;

	for (i = 0; i < PCI_ROM_RESOURCE; i++) {
		struct bin_attribute *res_attr;

		res_attr = pdev->res_attr[i];
		if (res_attr) {
			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
			kfree(res_attr);
		}

		res_attr = pdev->res_attr_wc[i];
		if (res_attr) {
			sysfs_remove_bin_file(&pdev->dev.kobj, res_attr);
			kfree(res_attr);
		}
	}
}

static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num)
{
	struct pci_bus_region bar;
	struct pci_controller *hose = pdev->sysdata;
	long dense_offset;
	unsigned long sparse_size;

	pcibios_resource_to_bus(pdev, &bar, &pdev->resource[num]);

	/* All core logic chips have 4G sparse address space, except
	   CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM
	   definitions in asm/core_xxx.h files). This corresponds
	   to 128M or 512M of the bus space. */
	dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base);
	sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000;

	return bar.end < sparse_size;
}

static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name,
			       char *suffix, struct bin_attribute *res_attr,
			       unsigned long sparse)
{
	size_t size = pci_resource_len(pdev, num);

	sprintf(name, "resource%d%s", num, suffix);
	res_attr->mmap = sparse ? pci_mmap_resource_sparse :
				  pci_mmap_resource_dense;
	res_attr->attr.name = name;
	res_attr->attr.mode = S_IRUSR | S_IWUSR;
	res_attr->size = sparse ? size << 5 : size;
	res_attr->private = &pdev->resource[num];
	return sysfs_create_bin_file(&pdev->dev.kobj, res_attr);
}

static int pci_create_attr(struct pci_dev *pdev, int num)
{
	/* allocate attribute structure, piggyback attribute name */
	int retval, nlen1, nlen2 = 0, res_count = 1;
	unsigned long sparse_base, dense_base;
	struct bin_attribute *attr;
	struct pci_controller *hose = pdev->sysdata;
	char *suffix, *attr_name;

	suffix = "";	/* Assume bwx machine, normal resourceN files. */
	nlen1 = 10;

	if (pdev->resource[num].flags & IORESOURCE_MEM) {
		sparse_base = hose->sparse_mem_base;
		dense_base = hose->dense_mem_base;
		if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) {
			sparse_base = 0;
			suffix = "_dense";
			nlen1 = 16;	/* resourceN_dense */
		}
	} else {
		sparse_base = hose->sparse_io_base;
		dense_base = hose->dense_io_base;
	}

	if (sparse_base) {
		suffix = "_sparse";
		nlen1 = 17;
		if (dense_base) {
			nlen2 = 16;	/* resourceN_dense */
			res_count = 2;
		}
	}

	attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC);
	if (!attr)
		return -ENOMEM;

	/* Create bwx, sparse or single dense file */
	attr_name = (char *)(attr + res_count);
	pdev->res_attr[num] = attr;
	retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr,
				     sparse_base);
	if (retval || res_count == 1)
		return retval;

	/* Create dense file */
	attr_name += nlen1;
	attr++;
	pdev->res_attr_wc[num] = attr;
	return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0);
}

/**
 * pci_create_resource_files - create resource files in sysfs for @dev
 * @dev: dev in question
 *
 * Walk the resources in @dev creating files for each resource available.
 */
int pci_create_resource_files(struct pci_dev *pdev)
{
	int i;
	int retval;

	/* Expose the PCI resources from this device as files */
	for (i = 0; i < PCI_ROM_RESOURCE; i++) {

		/* skip empty resources */
		if (!pci_resource_len(pdev, i))
			continue;

		retval = pci_create_attr(pdev, i);
		if (retval) {
			pci_remove_resource_files(pdev);
			return retval;
		}
	}
	return 0;
}

/* Legacy I/O bus mapping stuff. */

static int __legacy_mmap_fits(struct pci_controller *hose,
			      struct vm_area_struct *vma,
			      unsigned long res_size, int sparse)
{
	unsigned long nr, start, size;

	nr = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
	start = vma->vm_pgoff;
	size = ((res_size - 1) >> PAGE_SHIFT) + 1;

	if (start < size && size - start >= nr)
		return 1;
	WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d "
		"(size 0x%08lx)\n",
		current->comm, sparse ? " sparse" : "", start, start + nr,
		hose->index, size);
	return 0;
}

static inline int has_sparse(struct pci_controller *hose,
			     enum pci_mmap_state mmap_type)
{
	unsigned long base;

	base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base :
					     hose->sparse_io_base;

	return base != 0;
}

int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma,
			       enum pci_mmap_state mmap_type)
{
	struct pci_controller *hose = bus->sysdata;
	int sparse = has_sparse(hose, mmap_type);
	unsigned long res_size;

	res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size :
						 bus->legacy_io->size;
	if (!__legacy_mmap_fits(hose, vma, res_size, sparse))
		return -EINVAL;

	return hose_mmap_page_range(hose, vma, mmap_type, sparse);
}

/**
 * pci_adjust_legacy_attr - adjustment of legacy file attributes
 * @b: bus to create files under
 * @mmap_type: I/O port or memory
 *
 * Adjust file name and size for sparse mappings.
 */
void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type)
{
	struct pci_controller *hose = bus->sysdata;

	if (!has_sparse(hose, mmap_type))
		return;

	if (mmap_type == pci_mmap_mem) {
		bus->legacy_mem->attr.name = "legacy_mem_sparse";
		bus->legacy_mem->size <<= 5;
	} else {
		bus->legacy_io->attr.name = "legacy_io_sparse";
		bus->legacy_io->size <<= 5;
	}
	return;
}

/* Legacy I/O bus read/write functions */
int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size)
{
	struct pci_controller *hose = bus->sysdata;

	port += hose->io_space->start;

	switch(size) {
	case 1:
		*((u8 *)val) = inb(port);
		return 1;
	case 2:
		if (port & 1)
			return -EINVAL;
		*((u16 *)val) = inw(port);
		return 2;
	case 4:
		if (port & 3)
			return -EINVAL;
		*((u32 *)val) = inl(port);
		return 4;
	}
	return -EINVAL;
}

int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size)
{
	struct pci_controller *hose = bus->sysdata;

	port += hose->io_space->start;

	switch(size) {
	case 1:
		outb(port, val);
		return 1;
	case 2:
		if (port & 1)
			return -EINVAL;
		outw(port, val);
		return 2;
	case 4:
		if (port & 3)
			return -EINVAL;
		outl(port, val);
		return 4;
	}
	return -EINVAL;
}