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