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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
10a0ef39 IK |
2 | /* |
3 | * arch/alpha/kernel/pci-sysfs.c | |
4 | * | |
5 | * Copyright (C) 2009 Ivan Kokshaysky | |
6 | * | |
7 | * Alpha PCI resource files. | |
8 | * | |
9 | * Loosely based on generic HAVE_PCI_MMAP implementation in | |
10 | * drivers/pci/pci-sysfs.c | |
11 | */ | |
12 | ||
13 | #include <linux/sched.h> | |
ce7cf073 | 14 | #include <linux/stat.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
10a0ef39 IK |
16 | #include <linux/pci.h> |
17 | ||
18 | static int hose_mmap_page_range(struct pci_controller *hose, | |
19 | struct vm_area_struct *vma, | |
20 | enum pci_mmap_state mmap_type, int sparse) | |
21 | { | |
22 | unsigned long base; | |
23 | ||
24 | if (mmap_type == pci_mmap_mem) | |
25 | base = sparse ? hose->sparse_mem_base : hose->dense_mem_base; | |
26 | else | |
27 | base = sparse ? hose->sparse_io_base : hose->dense_io_base; | |
28 | ||
29 | vma->vm_pgoff += base >> PAGE_SHIFT; | |
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30 | |
31 | return io_remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, | |
32 | vma->vm_end - vma->vm_start, | |
33 | vma->vm_page_prot); | |
34 | } | |
35 | ||
36 | static int __pci_mmap_fits(struct pci_dev *pdev, int num, | |
37 | struct vm_area_struct *vma, int sparse) | |
38 | { | |
39 | unsigned long nr, start, size; | |
40 | int shift = sparse ? 5 : 0; | |
41 | ||
236d62b0 | 42 | nr = vma_pages(vma); |
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43 | start = vma->vm_pgoff; |
44 | size = ((pci_resource_len(pdev, num) - 1) >> (PAGE_SHIFT - shift)) + 1; | |
45 | ||
46 | if (start < size && size - start >= nr) | |
47 | return 1; | |
48 | WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on %s BAR %d " | |
49 | "(size 0x%08lx)\n", | |
50 | current->comm, sparse ? " sparse" : "", start, start + nr, | |
51 | pci_name(pdev), num, size); | |
52 | return 0; | |
53 | } | |
54 | ||
55 | /** | |
56 | * pci_mmap_resource - map a PCI resource into user memory space | |
57 | * @kobj: kobject for mapping | |
58 | * @attr: struct bin_attribute for the file being mapped | |
59 | * @vma: struct vm_area_struct passed into the mmap | |
60 | * @sparse: address space type | |
61 | * | |
62 | * Use the bus mapping routines to map a PCI resource into userspace. | |
0a9d991c RD |
63 | * |
64 | * Return: %0 on success, negative error code otherwise | |
10a0ef39 | 65 | */ |
5efa16ff | 66 | static int pci_mmap_resource(struct kobject *kobj, |
2c3c8bea | 67 | struct bin_attribute *attr, |
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68 | struct vm_area_struct *vma, int sparse) |
69 | { | |
8c9b839c | 70 | struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); |
af96f8a3 | 71 | struct resource *res = attr->private; |
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72 | enum pci_mmap_state mmap_type; |
73 | struct pci_bus_region bar; | |
74 | int i; | |
75 | ||
c9c13ba4 | 76 | for (i = 0; i < PCI_STD_NUM_BARS; i++) |
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77 | if (res == &pdev->resource[i]) |
78 | break; | |
c9c13ba4 | 79 | if (i >= PCI_STD_NUM_BARS) |
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80 | return -ENODEV; |
81 | ||
c20e1280 | 82 | if (res->flags & IORESOURCE_MEM && iomem_is_exclusive(res->start)) |
10a0ef39 IK |
83 | return -EINVAL; |
84 | ||
c20e1280 | 85 | if (!__pci_mmap_fits(pdev, i, vma, sparse)) |
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86 | return -EINVAL; |
87 | ||
fc279850 | 88 | pcibios_resource_to_bus(pdev->bus, &bar, res); |
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89 | vma->vm_pgoff += bar.start >> (PAGE_SHIFT - (sparse ? 5 : 0)); |
90 | mmap_type = res->flags & IORESOURCE_MEM ? pci_mmap_mem : pci_mmap_io; | |
91 | ||
92 | return hose_mmap_page_range(pdev->sysdata, vma, mmap_type, sparse); | |
93 | } | |
94 | ||
2c3c8bea | 95 | static int pci_mmap_resource_sparse(struct file *filp, struct kobject *kobj, |
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96 | struct bin_attribute *attr, |
97 | struct vm_area_struct *vma) | |
98 | { | |
99 | return pci_mmap_resource(kobj, attr, vma, 1); | |
100 | } | |
101 | ||
2c3c8bea | 102 | static int pci_mmap_resource_dense(struct file *filp, struct kobject *kobj, |
10a0ef39 IK |
103 | struct bin_attribute *attr, |
104 | struct vm_area_struct *vma) | |
105 | { | |
106 | return pci_mmap_resource(kobj, attr, vma, 0); | |
107 | } | |
108 | ||
109 | /** | |
110 | * pci_remove_resource_files - cleanup resource files | |
0a9d991c | 111 | * @pdev: pci_dev to cleanup |
10a0ef39 IK |
112 | * |
113 | * If we created resource files for @dev, remove them from sysfs and | |
114 | * free their resources. | |
115 | */ | |
116 | void pci_remove_resource_files(struct pci_dev *pdev) | |
117 | { | |
118 | int i; | |
119 | ||
c9c13ba4 | 120 | for (i = 0; i < PCI_STD_NUM_BARS; i++) { |
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121 | struct bin_attribute *res_attr; |
122 | ||
123 | res_attr = pdev->res_attr[i]; | |
124 | if (res_attr) { | |
125 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
126 | kfree(res_attr); | |
127 | } | |
128 | ||
129 | res_attr = pdev->res_attr_wc[i]; | |
130 | if (res_attr) { | |
131 | sysfs_remove_bin_file(&pdev->dev.kobj, res_attr); | |
132 | kfree(res_attr); | |
133 | } | |
134 | } | |
135 | } | |
136 | ||
137 | static int sparse_mem_mmap_fits(struct pci_dev *pdev, int num) | |
138 | { | |
139 | struct pci_bus_region bar; | |
140 | struct pci_controller *hose = pdev->sysdata; | |
141 | long dense_offset; | |
142 | unsigned long sparse_size; | |
143 | ||
fc279850 | 144 | pcibios_resource_to_bus(pdev->bus, &bar, &pdev->resource[num]); |
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145 | |
146 | /* All core logic chips have 4G sparse address space, except | |
147 | CIA which has 16G (see xxx_SPARSE_MEM and xxx_DENSE_MEM | |
148 | definitions in asm/core_xxx.h files). This corresponds | |
149 | to 128M or 512M of the bus space. */ | |
150 | dense_offset = (long)(hose->dense_mem_base - hose->sparse_mem_base); | |
151 | sparse_size = dense_offset >= 0x400000000UL ? 0x20000000 : 0x8000000; | |
152 | ||
153 | return bar.end < sparse_size; | |
154 | } | |
155 | ||
156 | static int pci_create_one_attr(struct pci_dev *pdev, int num, char *name, | |
157 | char *suffix, struct bin_attribute *res_attr, | |
158 | unsigned long sparse) | |
159 | { | |
160 | size_t size = pci_resource_len(pdev, num); | |
161 | ||
162 | sprintf(name, "resource%d%s", num, suffix); | |
163 | res_attr->mmap = sparse ? pci_mmap_resource_sparse : | |
164 | pci_mmap_resource_dense; | |
165 | res_attr->attr.name = name; | |
166 | res_attr->attr.mode = S_IRUSR | S_IWUSR; | |
167 | res_attr->size = sparse ? size << 5 : size; | |
168 | res_attr->private = &pdev->resource[num]; | |
169 | return sysfs_create_bin_file(&pdev->dev.kobj, res_attr); | |
170 | } | |
171 | ||
172 | static int pci_create_attr(struct pci_dev *pdev, int num) | |
173 | { | |
174 | /* allocate attribute structure, piggyback attribute name */ | |
175 | int retval, nlen1, nlen2 = 0, res_count = 1; | |
176 | unsigned long sparse_base, dense_base; | |
177 | struct bin_attribute *attr; | |
178 | struct pci_controller *hose = pdev->sysdata; | |
179 | char *suffix, *attr_name; | |
180 | ||
181 | suffix = ""; /* Assume bwx machine, normal resourceN files. */ | |
182 | nlen1 = 10; | |
183 | ||
184 | if (pdev->resource[num].flags & IORESOURCE_MEM) { | |
185 | sparse_base = hose->sparse_mem_base; | |
186 | dense_base = hose->dense_mem_base; | |
187 | if (sparse_base && !sparse_mem_mmap_fits(pdev, num)) { | |
188 | sparse_base = 0; | |
189 | suffix = "_dense"; | |
190 | nlen1 = 16; /* resourceN_dense */ | |
191 | } | |
192 | } else { | |
193 | sparse_base = hose->sparse_io_base; | |
194 | dense_base = hose->dense_io_base; | |
195 | } | |
196 | ||
197 | if (sparse_base) { | |
198 | suffix = "_sparse"; | |
199 | nlen1 = 17; | |
200 | if (dense_base) { | |
201 | nlen2 = 16; /* resourceN_dense */ | |
202 | res_count = 2; | |
203 | } | |
204 | } | |
205 | ||
206 | attr = kzalloc(sizeof(*attr) * res_count + nlen1 + nlen2, GFP_ATOMIC); | |
207 | if (!attr) | |
208 | return -ENOMEM; | |
209 | ||
210 | /* Create bwx, sparse or single dense file */ | |
211 | attr_name = (char *)(attr + res_count); | |
212 | pdev->res_attr[num] = attr; | |
213 | retval = pci_create_one_attr(pdev, num, attr_name, suffix, attr, | |
214 | sparse_base); | |
215 | if (retval || res_count == 1) | |
216 | return retval; | |
217 | ||
218 | /* Create dense file */ | |
219 | attr_name += nlen1; | |
220 | attr++; | |
221 | pdev->res_attr_wc[num] = attr; | |
222 | return pci_create_one_attr(pdev, num, attr_name, "_dense", attr, 0); | |
223 | } | |
224 | ||
225 | /** | |
0a9d991c RD |
226 | * pci_create_resource_files - create resource files in sysfs for @pdev |
227 | * @pdev: pci_dev in question | |
10a0ef39 IK |
228 | * |
229 | * Walk the resources in @dev creating files for each resource available. | |
0a9d991c RD |
230 | * |
231 | * Return: %0 on success, or negative error code | |
10a0ef39 IK |
232 | */ |
233 | int pci_create_resource_files(struct pci_dev *pdev) | |
234 | { | |
235 | int i; | |
236 | int retval; | |
237 | ||
238 | /* Expose the PCI resources from this device as files */ | |
c9c13ba4 | 239 | for (i = 0; i < PCI_STD_NUM_BARS; i++) { |
10a0ef39 IK |
240 | |
241 | /* skip empty resources */ | |
242 | if (!pci_resource_len(pdev, i)) | |
243 | continue; | |
244 | ||
245 | retval = pci_create_attr(pdev, i); | |
246 | if (retval) { | |
247 | pci_remove_resource_files(pdev); | |
248 | return retval; | |
249 | } | |
250 | } | |
251 | return 0; | |
252 | } | |
253 | ||
254 | /* Legacy I/O bus mapping stuff. */ | |
255 | ||
256 | static int __legacy_mmap_fits(struct pci_controller *hose, | |
257 | struct vm_area_struct *vma, | |
258 | unsigned long res_size, int sparse) | |
259 | { | |
260 | unsigned long nr, start, size; | |
261 | ||
236d62b0 | 262 | nr = vma_pages(vma); |
10a0ef39 IK |
263 | start = vma->vm_pgoff; |
264 | size = ((res_size - 1) >> PAGE_SHIFT) + 1; | |
265 | ||
266 | if (start < size && size - start >= nr) | |
267 | return 1; | |
268 | WARN(1, "process \"%s\" tried to map%s 0x%08lx-0x%08lx on hose %d " | |
269 | "(size 0x%08lx)\n", | |
270 | current->comm, sparse ? " sparse" : "", start, start + nr, | |
271 | hose->index, size); | |
272 | return 0; | |
273 | } | |
274 | ||
275 | static inline int has_sparse(struct pci_controller *hose, | |
276 | enum pci_mmap_state mmap_type) | |
277 | { | |
278 | unsigned long base; | |
279 | ||
280 | base = (mmap_type == pci_mmap_mem) ? hose->sparse_mem_base : | |
281 | hose->sparse_io_base; | |
282 | ||
283 | return base != 0; | |
284 | } | |
285 | ||
286 | int pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma, | |
287 | enum pci_mmap_state mmap_type) | |
288 | { | |
289 | struct pci_controller *hose = bus->sysdata; | |
290 | int sparse = has_sparse(hose, mmap_type); | |
291 | unsigned long res_size; | |
292 | ||
293 | res_size = (mmap_type == pci_mmap_mem) ? bus->legacy_mem->size : | |
294 | bus->legacy_io->size; | |
295 | if (!__legacy_mmap_fits(hose, vma, res_size, sparse)) | |
296 | return -EINVAL; | |
297 | ||
298 | return hose_mmap_page_range(hose, vma, mmap_type, sparse); | |
299 | } | |
300 | ||
301 | /** | |
302 | * pci_adjust_legacy_attr - adjustment of legacy file attributes | |
0a9d991c | 303 | * @bus: bus to create files under |
10a0ef39 IK |
304 | * @mmap_type: I/O port or memory |
305 | * | |
306 | * Adjust file name and size for sparse mappings. | |
307 | */ | |
308 | void pci_adjust_legacy_attr(struct pci_bus *bus, enum pci_mmap_state mmap_type) | |
309 | { | |
310 | struct pci_controller *hose = bus->sysdata; | |
311 | ||
312 | if (!has_sparse(hose, mmap_type)) | |
313 | return; | |
314 | ||
315 | if (mmap_type == pci_mmap_mem) { | |
316 | bus->legacy_mem->attr.name = "legacy_mem_sparse"; | |
317 | bus->legacy_mem->size <<= 5; | |
318 | } else { | |
319 | bus->legacy_io->attr.name = "legacy_io_sparse"; | |
320 | bus->legacy_io->size <<= 5; | |
321 | } | |
322 | return; | |
323 | } | |
324 | ||
325 | /* Legacy I/O bus read/write functions */ | |
326 | int pci_legacy_read(struct pci_bus *bus, loff_t port, u32 *val, size_t size) | |
327 | { | |
328 | struct pci_controller *hose = bus->sysdata; | |
329 | ||
330 | port += hose->io_space->start; | |
331 | ||
332 | switch(size) { | |
333 | case 1: | |
334 | *((u8 *)val) = inb(port); | |
335 | return 1; | |
336 | case 2: | |
337 | if (port & 1) | |
338 | return -EINVAL; | |
339 | *((u16 *)val) = inw(port); | |
340 | return 2; | |
341 | case 4: | |
342 | if (port & 3) | |
343 | return -EINVAL; | |
344 | *((u32 *)val) = inl(port); | |
345 | return 4; | |
346 | } | |
347 | return -EINVAL; | |
348 | } | |
349 | ||
350 | int pci_legacy_write(struct pci_bus *bus, loff_t port, u32 val, size_t size) | |
351 | { | |
352 | struct pci_controller *hose = bus->sysdata; | |
353 | ||
354 | port += hose->io_space->start; | |
355 | ||
356 | switch(size) { | |
357 | case 1: | |
358 | outb(port, val); | |
359 | return 1; | |
360 | case 2: | |
361 | if (port & 1) | |
362 | return -EINVAL; | |
363 | outw(port, val); | |
364 | return 2; | |
365 | case 4: | |
366 | if (port & 3) | |
367 | return -EINVAL; | |
368 | outl(port, val); | |
369 | return 4; | |
370 | } | |
371 | return -EINVAL; | |
372 | } |