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

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