[XFRM]: skb_cow_data() does not set proper owner for new skbs.
[linux-2.6/verdex.git] / drivers / char / agp / efficeon-agp.c
blob1383c3165ea1942143ad8f1fa18872cf78b982d0
1 /*
2 * Transmeta's Efficeon AGPGART driver.
3 *
4 * Based upon a diff by Linus around November '02.
6 * Ported to the 2.6 kernel by Carlos Puchol <cpglinux@puchol.com>
7 * and H. Peter Anvin <hpa@transmeta.com>.
8 */
11 * NOTE-cpg-040217:
13 * - when compiled as a module, after loading the module,
14 * it will refuse to unload, indicating it is in use,
15 * when it is not.
16 * - no s3 (suspend to ram) testing.
17 * - tested on the efficeon integrated nothbridge for tens
18 * of iterations of starting x and glxgears.
19 * - tested with radeon 9000 and radeon mobility m9 cards
20 * - tested with c3/c4 enabled (with the mobility m9 card)
23 #include <linux/module.h>
24 #include <linux/pci.h>
25 #include <linux/init.h>
26 #include <linux/agp_backend.h>
27 #include <linux/gfp.h>
28 #include <linux/page-flags.h>
29 #include <linux/mm.h>
30 #include "agp.h"
33 * The real differences to the generic AGP code is
34 * in the GART mappings - a two-level setup with the
35 * first level being an on-chip 64-entry table.
37 * The page array is filled through the ATTPAGE register
38 * (Aperture Translation Table Page Register) at 0xB8. Bits:
39 * 31:20: physical page address
40 * 11:9: Page Attribute Table Index (PATI)
41 * must match the PAT index for the
42 * mapped pages (the 2nd level page table pages
43 * themselves should be just regular WB-cacheable,
44 * so this is normally zero.)
45 * 8: Present
46 * 7:6: reserved, write as zero
47 * 5:0: GATT directory index: which 1st-level entry
49 * The Efficeon AGP spec requires pages to be WB-cacheable
50 * but to be explicitly CLFLUSH'd after any changes.
52 #define EFFICEON_ATTPAGE 0xb8
53 #define EFFICEON_L1_SIZE 64 /* Number of PDE pages */
55 #define EFFICEON_PATI (0 << 9)
56 #define EFFICEON_PRESENT (1 << 8)
58 static struct _efficeon_private {
59 unsigned long l1_table[EFFICEON_L1_SIZE];
60 } efficeon_private;
62 static struct gatt_mask efficeon_generic_masks[] =
64 {.mask = 0x00000001, .type = 0}
67 static struct aper_size_info_lvl2 efficeon_generic_sizes[4] =
69 {256, 65536, 0},
70 {128, 32768, 32},
71 {64, 16384, 48},
72 {32, 8192, 56}
76 * Control interfaces are largely identical to
77 * the legacy Intel 440BX..
80 static int efficeon_fetch_size(void)
82 int i;
83 u16 temp;
84 struct aper_size_info_lvl2 *values;
86 pci_read_config_word(agp_bridge->dev, INTEL_APSIZE, &temp);
87 values = A_SIZE_LVL2(agp_bridge->driver->aperture_sizes);
89 for (i = 0; i < agp_bridge->driver->num_aperture_sizes; i++) {
90 if (temp == values[i].size_value) {
91 agp_bridge->previous_size =
92 agp_bridge->current_size = (void *) (values + i);
93 agp_bridge->aperture_size_idx = i;
94 return values[i].size;
98 return 0;
101 static void efficeon_tlbflush(struct agp_memory * mem)
103 printk(KERN_DEBUG PFX "efficeon_tlbflush()\n");
104 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2200);
105 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
108 static void efficeon_cleanup(void)
110 u16 temp;
111 struct aper_size_info_lvl2 *previous_size;
113 printk(KERN_DEBUG PFX "efficeon_cleanup()\n");
114 previous_size = A_SIZE_LVL2(agp_bridge->previous_size);
115 pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp);
116 pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG, temp & ~(1 << 9));
117 pci_write_config_word(agp_bridge->dev, INTEL_APSIZE,
118 previous_size->size_value);
121 static int efficeon_configure(void)
123 u32 temp;
124 u16 temp2;
125 struct aper_size_info_lvl2 *current_size;
127 printk(KERN_DEBUG PFX "efficeon_configure()\n");
129 current_size = A_SIZE_LVL2(agp_bridge->current_size);
131 /* aperture size */
132 pci_write_config_word(agp_bridge->dev, INTEL_APSIZE,
133 current_size->size_value);
135 /* address to map to */
136 pci_read_config_dword(agp_bridge->dev, AGP_APBASE, &temp);
137 agp_bridge->gart_bus_addr = (temp & PCI_BASE_ADDRESS_MEM_MASK);
139 /* agpctrl */
140 pci_write_config_dword(agp_bridge->dev, INTEL_AGPCTRL, 0x2280);
142 /* paccfg/nbxcfg */
143 pci_read_config_word(agp_bridge->dev, INTEL_NBXCFG, &temp2);
144 pci_write_config_word(agp_bridge->dev, INTEL_NBXCFG,
145 (temp2 & ~(1 << 10)) | (1 << 9) | (1 << 11));
146 /* clear any possible error conditions */
147 pci_write_config_byte(agp_bridge->dev, INTEL_ERRSTS + 1, 7);
148 return 0;
151 static int efficeon_free_gatt_table(struct agp_bridge_data *bridge)
153 int index, freed = 0;
155 for (index = 0; index < EFFICEON_L1_SIZE; index++) {
156 unsigned long page = efficeon_private.l1_table[index];
157 if (page) {
158 efficeon_private.l1_table[index] = 0;
159 ClearPageReserved(virt_to_page((char *)page));
160 free_page(page);
161 freed++;
163 printk(KERN_DEBUG PFX "efficeon_free_gatt_table(%p, %02x, %08x)\n",
164 agp_bridge->dev, EFFICEON_ATTPAGE, index);
165 pci_write_config_dword(agp_bridge->dev,
166 EFFICEON_ATTPAGE, index);
168 printk(KERN_DEBUG PFX "efficeon_free_gatt_table() freed %d pages\n", freed);
169 return 0;
174 * Since we don't need contigious memory we just try
175 * to get the gatt table once
178 #define GET_PAGE_DIR_OFF(addr) (addr >> 22)
179 #define GET_PAGE_DIR_IDX(addr) (GET_PAGE_DIR_OFF(addr) - \
180 GET_PAGE_DIR_OFF(agp_bridge->gart_bus_addr))
181 #define GET_GATT_OFF(addr) ((addr & 0x003ff000) >> 12)
182 #undef GET_GATT
183 #define GET_GATT(addr) (efficeon_private.gatt_pages[\
184 GET_PAGE_DIR_IDX(addr)]->remapped)
186 static int efficeon_create_gatt_table(struct agp_bridge_data *bridge)
188 int index;
189 const int pati = EFFICEON_PATI;
190 const int present = EFFICEON_PRESENT;
191 const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3;
192 int num_entries, l1_pages;
194 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
196 printk(KERN_DEBUG PFX "efficeon_create_gatt_table(%d)\n", num_entries);
198 /* There are 2^10 PTE pages per PDE page */
199 BUG_ON(num_entries & 0x3ff);
200 l1_pages = num_entries >> 10;
202 for (index = 0 ; index < l1_pages ; index++) {
203 int offset;
204 unsigned long page;
205 unsigned long value;
207 page = efficeon_private.l1_table[index];
208 BUG_ON(page);
210 page = get_zeroed_page(GFP_KERNEL);
211 if (!page) {
212 efficeon_free_gatt_table(agp_bridge);
213 return -ENOMEM;
215 SetPageReserved(virt_to_page((char *)page));
217 for (offset = 0; offset < PAGE_SIZE; offset += clflush_chunk)
218 asm volatile("clflush %0" : : "m" (*(char *)(page+offset)));
220 efficeon_private.l1_table[index] = page;
222 value = __pa(page) | pati | present | index;
224 pci_write_config_dword(agp_bridge->dev,
225 EFFICEON_ATTPAGE, value);
228 return 0;
231 static int efficeon_insert_memory(struct agp_memory * mem, off_t pg_start, int type)
233 int i, count = mem->page_count, num_entries;
234 unsigned int *page, *last_page;
235 const int clflush_chunk = ((cpuid_ebx(1) >> 8) & 0xff) << 3;
236 const unsigned long clflush_mask = ~(clflush_chunk-1);
238 printk(KERN_DEBUG PFX "efficeon_insert_memory(%lx, %d)\n", pg_start, count);
240 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
241 if ((pg_start + mem->page_count) > num_entries)
242 return -EINVAL;
243 if (type != 0 || mem->type != 0)
244 return -EINVAL;
246 if (mem->is_flushed == FALSE) {
247 global_cache_flush();
248 mem->is_flushed = TRUE;
251 last_page = NULL;
252 for (i = 0; i < count; i++) {
253 int index = pg_start + i;
254 unsigned long insert = mem->memory[i];
256 page = (unsigned int *) efficeon_private.l1_table[index >> 10];
258 if (!page)
259 continue;
261 page += (index & 0x3ff);
262 *page = insert;
264 /* clflush is slow, so don't clflush until we have to */
265 if ( last_page &&
266 ((unsigned long)page^(unsigned long)last_page) & clflush_mask )
267 asm volatile("clflush %0" : : "m" (*last_page));
269 last_page = page;
272 if ( last_page )
273 asm volatile("clflush %0" : : "m" (*last_page));
275 agp_bridge->driver->tlb_flush(mem);
276 return 0;
279 static int efficeon_remove_memory(struct agp_memory * mem, off_t pg_start, int type)
281 int i, count = mem->page_count, num_entries;
283 printk(KERN_DEBUG PFX "efficeon_remove_memory(%lx, %d)\n", pg_start, count);
285 num_entries = A_SIZE_LVL2(agp_bridge->current_size)->num_entries;
287 if ((pg_start + mem->page_count) > num_entries)
288 return -EINVAL;
289 if (type != 0 || mem->type != 0)
290 return -EINVAL;
292 for (i = 0; i < count; i++) {
293 int index = pg_start + i;
294 unsigned int *page = (unsigned int *) efficeon_private.l1_table[index >> 10];
296 if (!page)
297 continue;
298 page += (index & 0x3ff);
299 *page = 0;
301 agp_bridge->driver->tlb_flush(mem);
302 return 0;
306 static struct agp_bridge_driver efficeon_driver = {
307 .owner = THIS_MODULE,
308 .aperture_sizes = efficeon_generic_sizes,
309 .size_type = LVL2_APER_SIZE,
310 .num_aperture_sizes = 4,
311 .configure = efficeon_configure,
312 .fetch_size = efficeon_fetch_size,
313 .cleanup = efficeon_cleanup,
314 .tlb_flush = efficeon_tlbflush,
315 .mask_memory = agp_generic_mask_memory,
316 .masks = efficeon_generic_masks,
317 .agp_enable = agp_generic_enable,
318 .cache_flush = global_cache_flush,
320 // Efficeon-specific GATT table setup / populate / teardown
321 .create_gatt_table = efficeon_create_gatt_table,
322 .free_gatt_table = efficeon_free_gatt_table,
323 .insert_memory = efficeon_insert_memory,
324 .remove_memory = efficeon_remove_memory,
325 .cant_use_aperture = 0, // 1 might be faster?
327 // Generic
328 .alloc_by_type = agp_generic_alloc_by_type,
329 .free_by_type = agp_generic_free_by_type,
330 .agp_alloc_page = agp_generic_alloc_page,
331 .agp_destroy_page = agp_generic_destroy_page,
335 static int agp_efficeon_resume(struct pci_dev *pdev)
337 printk(KERN_DEBUG PFX "agp_efficeon_resume()\n");
338 return efficeon_configure();
341 static int __devinit agp_efficeon_probe(struct pci_dev *pdev,
342 const struct pci_device_id *ent)
344 struct agp_bridge_data *bridge;
345 u8 cap_ptr;
346 struct resource *r;
348 cap_ptr = pci_find_capability(pdev, PCI_CAP_ID_AGP);
349 if (!cap_ptr)
350 return -ENODEV;
352 /* Probe for Efficeon controller */
353 if (pdev->device != PCI_DEVICE_ID_EFFICEON) {
354 printk(KERN_ERR PFX "Unsupported Efficeon chipset (device id: %04x)\n",
355 pdev->device);
356 return -ENODEV;
359 printk(KERN_INFO PFX "Detected Transmeta Efficeon TM8000 series chipset\n");
361 bridge = agp_alloc_bridge();
362 if (!bridge)
363 return -ENOMEM;
365 bridge->driver = &efficeon_driver;
366 bridge->dev = pdev;
367 bridge->capndx = cap_ptr;
370 * The following fixes the case where the BIOS has "forgotten" to
371 * provide an address range for the GART.
372 * 20030610 - hamish@zot.org
374 r = &pdev->resource[0];
375 if (!r->start && r->end) {
376 if(pci_assign_resource(pdev, 0)) {
377 printk(KERN_ERR PFX "could not assign resource 0\n");
378 return -ENODEV;
383 * If the device has not been properly setup, the following will catch
384 * the problem and should stop the system from crashing.
385 * 20030610 - hamish@zot.org
387 if (pci_enable_device(pdev)) {
388 printk(KERN_ERR PFX "Unable to Enable PCI device\n");
389 return -ENODEV;
392 /* Fill in the mode register */
393 if (cap_ptr) {
394 pci_read_config_dword(pdev,
395 bridge->capndx+PCI_AGP_STATUS,
396 &bridge->mode);
399 pci_set_drvdata(pdev, bridge);
400 return agp_add_bridge(bridge);
403 static void __devexit agp_efficeon_remove(struct pci_dev *pdev)
405 struct agp_bridge_data *bridge = pci_get_drvdata(pdev);
407 agp_remove_bridge(bridge);
408 agp_put_bridge(bridge);
411 static int agp_efficeon_suspend(struct pci_dev *dev, pm_message_t state)
413 return 0;
417 static struct pci_device_id agp_efficeon_pci_table[] = {
419 .class = (PCI_CLASS_BRIDGE_HOST << 8),
420 .class_mask = ~0,
421 .vendor = PCI_VENDOR_ID_TRANSMETA,
422 .device = PCI_ANY_ID,
423 .subvendor = PCI_ANY_ID,
424 .subdevice = PCI_ANY_ID,
429 MODULE_DEVICE_TABLE(pci, agp_efficeon_pci_table);
431 static struct pci_driver agp_efficeon_pci_driver = {
432 .name = "agpgart-efficeon",
433 .id_table = agp_efficeon_pci_table,
434 .probe = agp_efficeon_probe,
435 .remove = agp_efficeon_remove,
436 .suspend = agp_efficeon_suspend,
437 .resume = agp_efficeon_resume,
440 static int __init agp_efficeon_init(void)
442 static int agp_initialised=0;
444 if (agp_off)
445 return -EINVAL;
447 if (agp_initialised == 1)
448 return 0;
449 agp_initialised=1;
451 return pci_register_driver(&agp_efficeon_pci_driver);
454 static void __exit agp_efficeon_cleanup(void)
456 pci_unregister_driver(&agp_efficeon_pci_driver);
459 module_init(agp_efficeon_init);
460 module_exit(agp_efficeon_cleanup);
462 MODULE_AUTHOR("Carlos Puchol <cpglinux@puchol.com>");
463 MODULE_LICENSE("GPL and additional rights");