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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/pseries/iommu.c

Version: ~ [ linux-5.1-rc5 ] ~ [ linux-5.0.7 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.34 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.111 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.168 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.178 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.138 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.65 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.39.4 ] ~ [ linux-2.6.38.8 ] ~ [ linux-2.6.37.6 ] ~ [ linux-2.6.36.4 ] ~ [ linux-2.6.35.14 ] ~ [ linux-2.6.34.15 ] ~ [ linux-2.6.33.20 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
  3  *
  4  * Rewrite, cleanup:
  5  *
  6  * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, IBM Corporation
  7  * Copyright (C) 2006 Olof Johansson <olof@lixom.net>
  8  *
  9  * Dynamic DMA mapping support, pSeries-specific parts, both SMP and LPAR.
 10  *
 11  *
 12  * This program is free software; you can redistribute it and/or modify
 13  * it under the terms of the GNU General Public License as published by
 14  * the Free Software Foundation; either version 2 of the License, or
 15  * (at your option) any later version.
 16  *
 17  * This program is distributed in the hope that it will be useful,
 18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 20  * GNU General Public License for more details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 25  */
 26 
 27 #include <linux/init.h>
 28 #include <linux/types.h>
 29 #include <linux/slab.h>
 30 #include <linux/mm.h>
 31 #include <linux/spinlock.h>
 32 #include <linux/string.h>
 33 #include <linux/pci.h>
 34 #include <linux/dma-mapping.h>
 35 #include <linux/crash_dump.h>
 36 #include <linux/memory.h>
 37 #include <asm/io.h>
 38 #include <asm/prom.h>
 39 #include <asm/rtas.h>
 40 #include <asm/iommu.h>
 41 #include <asm/pci-bridge.h>
 42 #include <asm/machdep.h>
 43 #include <asm/abs_addr.h>
 44 #include <asm/pSeries_reconfig.h>
 45 #include <asm/firmware.h>
 46 #include <asm/tce.h>
 47 #include <asm/ppc-pci.h>
 48 #include <asm/udbg.h>
 49 #include <asm/mmzone.h>
 50 
 51 #include "plpar_wrappers.h"
 52 
 53 
 54 static int tce_build_pSeries(struct iommu_table *tbl, long index,
 55                               long npages, unsigned long uaddr,
 56                               enum dma_data_direction direction,
 57                               struct dma_attrs *attrs)
 58 {
 59         u64 proto_tce;
 60         u64 *tcep;
 61         u64 rpn;
 62 
 63         proto_tce = TCE_PCI_READ; // Read allowed
 64 
 65         if (direction != DMA_TO_DEVICE)
 66                 proto_tce |= TCE_PCI_WRITE;
 67 
 68         tcep = ((u64 *)tbl->it_base) + index;
 69 
 70         while (npages--) {
 71                 /* can't move this out since we might cross MEMBLOCK boundary */
 72                 rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
 73                 *tcep = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
 74 
 75                 uaddr += TCE_PAGE_SIZE;
 76                 tcep++;
 77         }
 78         return 0;
 79 }
 80 
 81 
 82 static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
 83 {
 84         u64 *tcep;
 85 
 86         tcep = ((u64 *)tbl->it_base) + index;
 87 
 88         while (npages--)
 89                 *(tcep++) = 0;
 90 }
 91 
 92 static unsigned long tce_get_pseries(struct iommu_table *tbl, long index)
 93 {
 94         u64 *tcep;
 95 
 96         tcep = ((u64 *)tbl->it_base) + index;
 97 
 98         return *tcep;
 99 }
100 
101 static void tce_free_pSeriesLP(struct iommu_table*, long, long);
102 static void tce_freemulti_pSeriesLP(struct iommu_table*, long, long);
103 
104 static int tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
105                                 long npages, unsigned long uaddr,
106                                 enum dma_data_direction direction,
107                                 struct dma_attrs *attrs)
108 {
109         u64 rc = 0;
110         u64 proto_tce, tce;
111         u64 rpn;
112         int ret = 0;
113         long tcenum_start = tcenum, npages_start = npages;
114 
115         rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
116         proto_tce = TCE_PCI_READ;
117         if (direction != DMA_TO_DEVICE)
118                 proto_tce |= TCE_PCI_WRITE;
119 
120         while (npages--) {
121                 tce = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
122                 rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, tce);
123 
124                 if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
125                         ret = (int)rc;
126                         tce_free_pSeriesLP(tbl, tcenum_start,
127                                            (npages_start - (npages + 1)));
128                         break;
129                 }
130 
131                 if (rc && printk_ratelimit()) {
132                         printk("tce_build_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc);
133                         printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
134                         printk("\ttcenum  = 0x%llx\n", (u64)tcenum);
135                         printk("\ttce val = 0x%llx\n", tce );
136                         show_stack(current, (unsigned long *)__get_SP());
137                 }
138 
139                 tcenum++;
140                 rpn++;
141         }
142         return ret;
143 }
144 
145 static DEFINE_PER_CPU(u64 *, tce_page);
146 
147 static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
148                                      long npages, unsigned long uaddr,
149                                      enum dma_data_direction direction,
150                                      struct dma_attrs *attrs)
151 {
152         u64 rc = 0;
153         u64 proto_tce;
154         u64 *tcep;
155         u64 rpn;
156         long l, limit;
157         long tcenum_start = tcenum, npages_start = npages;
158         int ret = 0;
159 
160         if (npages == 1) {
161                 return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
162                                            direction, attrs);
163         }
164 
165         tcep = __get_cpu_var(tce_page);
166 
167         /* This is safe to do since interrupts are off when we're called
168          * from iommu_alloc{,_sg}()
169          */
170         if (!tcep) {
171                 tcep = (u64 *)__get_free_page(GFP_ATOMIC);
172                 /* If allocation fails, fall back to the loop implementation */
173                 if (!tcep) {
174                         return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
175                                             direction, attrs);
176                 }
177                 __get_cpu_var(tce_page) = tcep;
178         }
179 
180         rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
181         proto_tce = TCE_PCI_READ;
182         if (direction != DMA_TO_DEVICE)
183                 proto_tce |= TCE_PCI_WRITE;
184 
185         /* We can map max one pageful of TCEs at a time */
186         do {
187                 /*
188                  * Set up the page with TCE data, looping through and setting
189                  * the values.
190                  */
191                 limit = min_t(long, npages, 4096/TCE_ENTRY_SIZE);
192 
193                 for (l = 0; l < limit; l++) {
194                         tcep[l] = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
195                         rpn++;
196                 }
197 
198                 rc = plpar_tce_put_indirect((u64)tbl->it_index,
199                                             (u64)tcenum << 12,
200                                             (u64)virt_to_abs(tcep),
201                                             limit);
202 
203                 npages -= limit;
204                 tcenum += limit;
205         } while (npages > 0 && !rc);
206 
207         if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
208                 ret = (int)rc;
209                 tce_freemulti_pSeriesLP(tbl, tcenum_start,
210                                         (npages_start - (npages + limit)));
211                 return ret;
212         }
213 
214         if (rc && printk_ratelimit()) {
215                 printk("tce_buildmulti_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc);
216                 printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
217                 printk("\tnpages  = 0x%llx\n", (u64)npages);
218                 printk("\ttce[0] val = 0x%llx\n", tcep[0]);
219                 show_stack(current, (unsigned long *)__get_SP());
220         }
221         return ret;
222 }
223 
224 static void tce_free_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
225 {
226         u64 rc;
227 
228         while (npages--) {
229                 rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, 0);
230 
231                 if (rc && printk_ratelimit()) {
232                         printk("tce_free_pSeriesLP: plpar_tce_put failed. rc=%lld\n", rc);
233                         printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
234                         printk("\ttcenum  = 0x%llx\n", (u64)tcenum);
235                         show_stack(current, (unsigned long *)__get_SP());
236                 }
237 
238                 tcenum++;
239         }
240 }
241 
242 
243 static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
244 {
245         u64 rc;
246 
247         rc = plpar_tce_stuff((u64)tbl->it_index, (u64)tcenum << 12, 0, npages);
248 
249         if (rc && printk_ratelimit()) {
250                 printk("tce_freemulti_pSeriesLP: plpar_tce_stuff failed\n");
251                 printk("\trc      = %lld\n", rc);
252                 printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
253                 printk("\tnpages  = 0x%llx\n", (u64)npages);
254                 show_stack(current, (unsigned long *)__get_SP());
255         }
256 }
257 
258 static unsigned long tce_get_pSeriesLP(struct iommu_table *tbl, long tcenum)
259 {
260         u64 rc;
261         unsigned long tce_ret;
262 
263         rc = plpar_tce_get((u64)tbl->it_index, (u64)tcenum << 12, &tce_ret);
264 
265         if (rc && printk_ratelimit()) {
266                 printk("tce_get_pSeriesLP: plpar_tce_get failed. rc=%lld\n", rc);
267                 printk("\tindex   = 0x%llx\n", (u64)tbl->it_index);
268                 printk("\ttcenum  = 0x%llx\n", (u64)tcenum);
269                 show_stack(current, (unsigned long *)__get_SP());
270         }
271 
272         return tce_ret;
273 }
274 
275 /* this is compatible with cells for the device tree property */
276 struct dynamic_dma_window_prop {
277         __be32  liobn;          /* tce table number */
278         __be64  dma_base;       /* address hi,lo */
279         __be32  tce_shift;      /* ilog2(tce_page_size) */
280         __be32  window_shift;   /* ilog2(tce_window_size) */
281 };
282 
283 struct direct_window {
284         struct device_node *device;
285         const struct dynamic_dma_window_prop *prop;
286         struct list_head list;
287 };
288 
289 /* Dynamic DMA Window support */
290 struct ddw_query_response {
291         u32 windows_available;
292         u32 largest_available_block;
293         u32 page_size;
294         u32 migration_capable;
295 };
296 
297 struct ddw_create_response {
298         u32 liobn;
299         u32 addr_hi;
300         u32 addr_lo;
301 };
302 
303 static LIST_HEAD(direct_window_list);
304 /* prevents races between memory on/offline and window creation */
305 static DEFINE_SPINLOCK(direct_window_list_lock);
306 /* protects initializing window twice for same device */
307 static DEFINE_MUTEX(direct_window_init_mutex);
308 #define DIRECT64_PROPNAME "linux,direct64-ddr-window-info"
309 
310 static int tce_clearrange_multi_pSeriesLP(unsigned long start_pfn,
311                                         unsigned long num_pfn, const void *arg)
312 {
313         const struct dynamic_dma_window_prop *maprange = arg;
314         int rc;
315         u64 tce_size, num_tce, dma_offset, next;
316         u32 tce_shift;
317         long limit;
318 
319         tce_shift = be32_to_cpu(maprange->tce_shift);
320         tce_size = 1ULL << tce_shift;
321         next = start_pfn << PAGE_SHIFT;
322         num_tce = num_pfn << PAGE_SHIFT;
323 
324         /* round back to the beginning of the tce page size */
325         num_tce += next & (tce_size - 1);
326         next &= ~(tce_size - 1);
327 
328         /* covert to number of tces */
329         num_tce |= tce_size - 1;
330         num_tce >>= tce_shift;
331 
332         do {
333                 /*
334                  * Set up the page with TCE data, looping through and setting
335                  * the values.
336                  */
337                 limit = min_t(long, num_tce, 512);
338                 dma_offset = next + be64_to_cpu(maprange->dma_base);
339 
340                 rc = plpar_tce_stuff((u64)be32_to_cpu(maprange->liobn),
341                                              dma_offset,
342                                              0, limit);
343                 num_tce -= limit;
344         } while (num_tce > 0 && !rc);
345 
346         return rc;
347 }
348 
349 static int tce_setrange_multi_pSeriesLP(unsigned long start_pfn,
350                                         unsigned long num_pfn, const void *arg)
351 {
352         const struct dynamic_dma_window_prop *maprange = arg;
353         u64 *tcep, tce_size, num_tce, dma_offset, next, proto_tce, liobn;
354         u32 tce_shift;
355         u64 rc = 0;
356         long l, limit;
357 
358         local_irq_disable();    /* to protect tcep and the page behind it */
359         tcep = __get_cpu_var(tce_page);
360 
361         if (!tcep) {
362                 tcep = (u64 *)__get_free_page(GFP_ATOMIC);
363                 if (!tcep) {
364                         local_irq_enable();
365                         return -ENOMEM;
366                 }
367                 __get_cpu_var(tce_page) = tcep;
368         }
369 
370         proto_tce = TCE_PCI_READ | TCE_PCI_WRITE;
371 
372         liobn = (u64)be32_to_cpu(maprange->liobn);
373         tce_shift = be32_to_cpu(maprange->tce_shift);
374         tce_size = 1ULL << tce_shift;
375         next = start_pfn << PAGE_SHIFT;
376         num_tce = num_pfn << PAGE_SHIFT;
377 
378         /* round back to the beginning of the tce page size */
379         num_tce += next & (tce_size - 1);
380         next &= ~(tce_size - 1);
381 
382         /* covert to number of tces */
383         num_tce |= tce_size - 1;
384         num_tce >>= tce_shift;
385 
386         /* We can map max one pageful of TCEs at a time */
387         do {
388                 /*
389                  * Set up the page with TCE data, looping through and setting
390                  * the values.
391                  */
392                 limit = min_t(long, num_tce, 4096/TCE_ENTRY_SIZE);
393                 dma_offset = next + be64_to_cpu(maprange->dma_base);
394 
395                 for (l = 0; l < limit; l++) {
396                         tcep[l] = proto_tce | next;
397                         next += tce_size;
398                 }
399 
400                 rc = plpar_tce_put_indirect(liobn,
401                                             dma_offset,
402                                             (u64)virt_to_abs(tcep),
403                                             limit);
404 
405                 num_tce -= limit;
406         } while (num_tce > 0 && !rc);
407 
408         /* error cleanup: caller will clear whole range */
409 
410         local_irq_enable();
411         return rc;
412 }
413 
414 static int tce_setrange_multi_pSeriesLP_walk(unsigned long start_pfn,
415                 unsigned long num_pfn, void *arg)
416 {
417         return tce_setrange_multi_pSeriesLP(start_pfn, num_pfn, arg);
418 }
419 
420 
421 #ifdef CONFIG_PCI
422 static void iommu_table_setparms(struct pci_controller *phb,
423                                  struct device_node *dn,
424                                  struct iommu_table *tbl)
425 {
426         struct device_node *node;
427         const unsigned long *basep;
428         const u32 *sizep;
429 
430         node = phb->dn;
431 
432         basep = of_get_property(node, "linux,tce-base", NULL);
433         sizep = of_get_property(node, "linux,tce-size", NULL);
434         if (basep == NULL || sizep == NULL) {
435                 printk(KERN_ERR "PCI_DMA: iommu_table_setparms: %s has "
436                                 "missing tce entries !\n", dn->full_name);
437                 return;
438         }
439 
440         tbl->it_base = (unsigned long)__va(*basep);
441 
442         if (!is_kdump_kernel())
443                 memset((void *)tbl->it_base, 0, *sizep);
444 
445         tbl->it_busno = phb->bus->number;
446 
447         /* Units of tce entries */
448         tbl->it_offset = phb->dma_window_base_cur >> IOMMU_PAGE_SHIFT;
449 
450         /* Test if we are going over 2GB of DMA space */
451         if (phb->dma_window_base_cur + phb->dma_window_size > 0x80000000ul) {
452                 udbg_printf("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
453                 panic("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
454         }
455 
456         phb->dma_window_base_cur += phb->dma_window_size;
457 
458         /* Set the tce table size - measured in entries */
459         tbl->it_size = phb->dma_window_size >> IOMMU_PAGE_SHIFT;
460 
461         tbl->it_index = 0;
462         tbl->it_blocksize = 16;
463         tbl->it_type = TCE_PCI;
464 }
465 
466 /*
467  * iommu_table_setparms_lpar
468  *
469  * Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
470  */
471 static void iommu_table_setparms_lpar(struct pci_controller *phb,
472                                       struct device_node *dn,
473                                       struct iommu_table *tbl,
474                                       const void *dma_window)
475 {
476         unsigned long offset, size;
477 
478         of_parse_dma_window(dn, dma_window, &tbl->it_index, &offset, &size);
479 
480         tbl->it_busno = phb->bus->number;
481         tbl->it_base   = 0;
482         tbl->it_blocksize  = 16;
483         tbl->it_type = TCE_PCI;
484         tbl->it_offset = offset >> IOMMU_PAGE_SHIFT;
485         tbl->it_size = size >> IOMMU_PAGE_SHIFT;
486 }
487 
488 static void pci_dma_bus_setup_pSeries(struct pci_bus *bus)
489 {
490         struct device_node *dn;
491         struct iommu_table *tbl;
492         struct device_node *isa_dn, *isa_dn_orig;
493         struct device_node *tmp;
494         struct pci_dn *pci;
495         int children;
496 
497         dn = pci_bus_to_OF_node(bus);
498 
499         pr_debug("pci_dma_bus_setup_pSeries: setting up bus %s\n", dn->full_name);
500 
501         if (bus->self) {
502                 /* This is not a root bus, any setup will be done for the
503                  * device-side of the bridge in iommu_dev_setup_pSeries().
504                  */
505                 return;
506         }
507         pci = PCI_DN(dn);
508 
509         /* Check if the ISA bus on the system is under
510          * this PHB.
511          */
512         isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa");
513 
514         while (isa_dn && isa_dn != dn)
515                 isa_dn = isa_dn->parent;
516 
517         if (isa_dn_orig)
518                 of_node_put(isa_dn_orig);
519 
520         /* Count number of direct PCI children of the PHB. */
521         for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling)
522                 children++;
523 
524         pr_debug("Children: %d\n", children);
525 
526         /* Calculate amount of DMA window per slot. Each window must be
527          * a power of two (due to pci_alloc_consistent requirements).
528          *
529          * Keep 256MB aside for PHBs with ISA.
530          */
531 
532         if (!isa_dn) {
533                 /* No ISA/IDE - just set window size and return */
534                 pci->phb->dma_window_size = 0x80000000ul; /* To be divided */
535 
536                 while (pci->phb->dma_window_size * children > 0x80000000ul)
537                         pci->phb->dma_window_size >>= 1;
538                 pr_debug("No ISA/IDE, window size is 0x%llx\n",
539                          pci->phb->dma_window_size);
540                 pci->phb->dma_window_base_cur = 0;
541 
542                 return;
543         }
544 
545         /* If we have ISA, then we probably have an IDE
546          * controller too. Allocate a 128MB table but
547          * skip the first 128MB to avoid stepping on ISA
548          * space.
549          */
550         pci->phb->dma_window_size = 0x8000000ul;
551         pci->phb->dma_window_base_cur = 0x8000000ul;
552 
553         tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
554                            pci->phb->node);
555 
556         iommu_table_setparms(pci->phb, dn, tbl);
557         pci->iommu_table = iommu_init_table(tbl, pci->phb->node);
558 
559         /* Divide the rest (1.75GB) among the children */
560         pci->phb->dma_window_size = 0x80000000ul;
561         while (pci->phb->dma_window_size * children > 0x70000000ul)
562                 pci->phb->dma_window_size >>= 1;
563 
564         pr_debug("ISA/IDE, window size is 0x%llx\n", pci->phb->dma_window_size);
565 }
566 
567 
568 static void pci_dma_bus_setup_pSeriesLP(struct pci_bus *bus)
569 {
570         struct iommu_table *tbl;
571         struct device_node *dn, *pdn;
572         struct pci_dn *ppci;
573         const void *dma_window = NULL;
574 
575         dn = pci_bus_to_OF_node(bus);
576 
577         pr_debug("pci_dma_bus_setup_pSeriesLP: setting up bus %s\n",
578                  dn->full_name);
579 
580         /* Find nearest ibm,dma-window, walking up the device tree */
581         for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
582                 dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
583                 if (dma_window != NULL)
584                         break;
585         }
586 
587         if (dma_window == NULL) {
588                 pr_debug("  no ibm,dma-window property !\n");
589                 return;
590         }
591 
592         ppci = PCI_DN(pdn);
593 
594         pr_debug("  parent is %s, iommu_table: 0x%p\n",
595                  pdn->full_name, ppci->iommu_table);
596 
597         if (!ppci->iommu_table) {
598                 tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
599                                    ppci->phb->node);
600                 iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
601                 ppci->iommu_table = iommu_init_table(tbl, ppci->phb->node);
602                 pr_debug("  created table: %p\n", ppci->iommu_table);
603         }
604 }
605 
606 
607 static void pci_dma_dev_setup_pSeries(struct pci_dev *dev)
608 {
609         struct device_node *dn;
610         struct iommu_table *tbl;
611 
612         pr_debug("pci_dma_dev_setup_pSeries: %s\n", pci_name(dev));
613 
614         dn = dev->dev.of_node;
615 
616         /* If we're the direct child of a root bus, then we need to allocate
617          * an iommu table ourselves. The bus setup code should have setup
618          * the window sizes already.
619          */
620         if (!dev->bus->self) {
621                 struct pci_controller *phb = PCI_DN(dn)->phb;
622 
623                 pr_debug(" --> first child, no bridge. Allocating iommu table.\n");
624                 tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
625                                    phb->node);
626                 iommu_table_setparms(phb, dn, tbl);
627                 PCI_DN(dn)->iommu_table = iommu_init_table(tbl, phb->node);
628                 set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
629                 return;
630         }
631 
632         /* If this device is further down the bus tree, search upwards until
633          * an already allocated iommu table is found and use that.
634          */
635 
636         while (dn && PCI_DN(dn) && PCI_DN(dn)->iommu_table == NULL)
637                 dn = dn->parent;
638 
639         if (dn && PCI_DN(dn))
640                 set_iommu_table_base(&dev->dev, PCI_DN(dn)->iommu_table);
641         else
642                 printk(KERN_WARNING "iommu: Device %s has no iommu table\n",
643                        pci_name(dev));
644 }
645 
646 static int __read_mostly disable_ddw;
647 
648 static int __init disable_ddw_setup(char *str)
649 {
650         disable_ddw = 1;
651         printk(KERN_INFO "ppc iommu: disabling ddw.\n");
652 
653         return 0;
654 }
655 
656 early_param("disable_ddw", disable_ddw_setup);
657 
658 static void remove_ddw(struct device_node *np)
659 {
660         struct dynamic_dma_window_prop *dwp;
661         struct property *win64;
662         const u32 *ddw_avail;
663         u64 liobn;
664         int len, ret;
665 
666         ddw_avail = of_get_property(np, "ibm,ddw-applicable", &len);
667         win64 = of_find_property(np, DIRECT64_PROPNAME, NULL);
668         if (!win64)
669                 return;
670 
671         if (!ddw_avail || len < 3 * sizeof(u32) || win64->length < sizeof(*dwp))
672                 goto delprop;
673 
674         dwp = win64->value;
675         liobn = (u64)be32_to_cpu(dwp->liobn);
676 
677         /* clear the whole window, note the arg is in kernel pages */
678         ret = tce_clearrange_multi_pSeriesLP(0,
679                 1ULL << (be32_to_cpu(dwp->window_shift) - PAGE_SHIFT), dwp);
680         if (ret)
681                 pr_warning("%s failed to clear tces in window.\n",
682                          np->full_name);
683         else
684                 pr_debug("%s successfully cleared tces in window.\n",
685                          np->full_name);
686 
687         ret = rtas_call(ddw_avail[2], 1, 1, NULL, liobn);
688         if (ret)
689                 pr_warning("%s: failed to remove direct window: rtas returned "
690                         "%d to ibm,remove-pe-dma-window(%x) %llx\n",
691                         np->full_name, ret, ddw_avail[2], liobn);
692         else
693                 pr_debug("%s: successfully removed direct window: rtas returned "
694                         "%d to ibm,remove-pe-dma-window(%x) %llx\n",
695                         np->full_name, ret, ddw_avail[2], liobn);
696 
697 delprop:
698         ret = prom_remove_property(np, win64);
699         if (ret)
700                 pr_warning("%s: failed to remove direct window property: %d\n",
701                         np->full_name, ret);
702 }
703 
704 static u64 find_existing_ddw(struct device_node *pdn)
705 {
706         struct direct_window *window;
707         const struct dynamic_dma_window_prop *direct64;
708         u64 dma_addr = 0;
709 
710         spin_lock(&direct_window_list_lock);
711         /* check if we already created a window and dupe that config if so */
712         list_for_each_entry(window, &direct_window_list, list) {
713                 if (window->device == pdn) {
714                         direct64 = window->prop;
715                         dma_addr = direct64->dma_base;
716                         break;
717                 }
718         }
719         spin_unlock(&direct_window_list_lock);
720 
721         return dma_addr;
722 }
723 
724 static int find_existing_ddw_windows(void)
725 {
726         int len;
727         struct device_node *pdn;
728         struct direct_window *window;
729         const struct dynamic_dma_window_prop *direct64;
730 
731         if (!firmware_has_feature(FW_FEATURE_LPAR))
732                 return 0;
733 
734         for_each_node_with_property(pdn, DIRECT64_PROPNAME) {
735                 direct64 = of_get_property(pdn, DIRECT64_PROPNAME, &len);
736                 if (!direct64)
737                         continue;
738 
739                 window = kzalloc(sizeof(*window), GFP_KERNEL);
740                 if (!window || len < sizeof(struct dynamic_dma_window_prop)) {
741                         kfree(window);
742                         remove_ddw(pdn);
743                         continue;
744                 }
745 
746                 window->device = pdn;
747                 window->prop = direct64;
748                 spin_lock(&direct_window_list_lock);
749                 list_add(&window->list, &direct_window_list);
750                 spin_unlock(&direct_window_list_lock);
751         }
752 
753         return 0;
754 }
755 machine_arch_initcall(pseries, find_existing_ddw_windows);
756 
757 static int query_ddw(struct pci_dev *dev, const u32 *ddw_avail,
758                         struct ddw_query_response *query)
759 {
760         struct device_node *dn;
761         struct pci_dn *pcidn;
762         u32 cfg_addr;
763         u64 buid;
764         int ret;
765 
766         /*
767          * Get the config address and phb buid of the PE window.
768          * Rely on eeh to retrieve this for us.
769          * Retrieve them from the pci device, not the node with the
770          * dma-window property
771          */
772         dn = pci_device_to_OF_node(dev);
773         pcidn = PCI_DN(dn);
774         cfg_addr = pcidn->eeh_config_addr;
775         if (pcidn->eeh_pe_config_addr)
776                 cfg_addr = pcidn->eeh_pe_config_addr;
777         buid = pcidn->phb->buid;
778         ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query,
779                   cfg_addr, BUID_HI(buid), BUID_LO(buid));
780         dev_info(&dev->dev, "ibm,query-pe-dma-windows(%x) %x %x %x"
781                 " returned %d\n", ddw_avail[0], cfg_addr, BUID_HI(buid),
782                 BUID_LO(buid), ret);
783         return ret;
784 }
785 
786 static int create_ddw(struct pci_dev *dev, const u32 *ddw_avail,
787                         struct ddw_create_response *create, int page_shift,
788                         int window_shift)
789 {
790         struct device_node *dn;
791         struct pci_dn *pcidn;
792         u32 cfg_addr;
793         u64 buid;
794         int ret;
795 
796         /*
797          * Get the config address and phb buid of the PE window.
798          * Rely on eeh to retrieve this for us.
799          * Retrieve them from the pci device, not the node with the
800          * dma-window property
801          */
802         dn = pci_device_to_OF_node(dev);
803         pcidn = PCI_DN(dn);
804         cfg_addr = pcidn->eeh_config_addr;
805         if (pcidn->eeh_pe_config_addr)
806                 cfg_addr = pcidn->eeh_pe_config_addr;
807         buid = pcidn->phb->buid;
808 
809         do {
810                 /* extra outputs are LIOBN and dma-addr (hi, lo) */
811                 ret = rtas_call(ddw_avail[1], 5, 4, (u32 *)create, cfg_addr,
812                                 BUID_HI(buid), BUID_LO(buid), page_shift, window_shift);
813         } while (rtas_busy_delay(ret));
814         dev_info(&dev->dev,
815                 "ibm,create-pe-dma-window(%x) %x %x %x %x %x returned %d "
816                 "(liobn = 0x%x starting addr = %x %x)\n", ddw_avail[1],
817                  cfg_addr, BUID_HI(buid), BUID_LO(buid), page_shift,
818                  window_shift, ret, create->liobn, create->addr_hi, create->addr_lo);
819 
820         return ret;
821 }
822 
823 /*
824  * If the PE supports dynamic dma windows, and there is space for a table
825  * that can map all pages in a linear offset, then setup such a table,
826  * and record the dma-offset in the struct device.
827  *
828  * dev: the pci device we are checking
829  * pdn: the parent pe node with the ibm,dma_window property
830  * Future: also check if we can remap the base window for our base page size
831  *
832  * returns the dma offset for use by dma_set_mask
833  */
834 static u64 enable_ddw(struct pci_dev *dev, struct device_node *pdn)
835 {
836         int len, ret;
837         struct ddw_query_response query;
838         struct ddw_create_response create;
839         int page_shift;
840         u64 dma_addr, max_addr;
841         struct device_node *dn;
842         const u32 *uninitialized_var(ddw_avail);
843         struct direct_window *window;
844         struct property *win64;
845         struct dynamic_dma_window_prop *ddwprop;
846 
847         mutex_lock(&direct_window_init_mutex);
848 
849         dma_addr = find_existing_ddw(pdn);
850         if (dma_addr != 0)
851                 goto out_unlock;
852 
853         /*
854          * the ibm,ddw-applicable property holds the tokens for:
855          * ibm,query-pe-dma-window
856          * ibm,create-pe-dma-window
857          * ibm,remove-pe-dma-window
858          * for the given node in that order.
859          * the property is actually in the parent, not the PE
860          */
861         ddw_avail = of_get_property(pdn, "ibm,ddw-applicable", &len);
862         if (!ddw_avail || len < 3 * sizeof(u32))
863                 goto out_unlock;
864 
865        /*
866          * Query if there is a second window of size to map the
867          * whole partition.  Query returns number of windows, largest
868          * block assigned to PE (partition endpoint), and two bitmasks
869          * of page sizes: supported and supported for migrate-dma.
870          */
871         dn = pci_device_to_OF_node(dev);
872         ret = query_ddw(dev, ddw_avail, &query);
873         if (ret != 0)
874                 goto out_unlock;
875 
876         if (query.windows_available == 0) {
877                 /*
878                  * no additional windows are available for this device.
879                  * We might be able to reallocate the existing window,
880                  * trading in for a larger page size.
881                  */
882                 dev_dbg(&dev->dev, "no free dynamic windows");
883                 goto out_unlock;
884         }
885         if (query.page_size & 4) {
886                 page_shift = 24; /* 16MB */
887         } else if (query.page_size & 2) {
888                 page_shift = 16; /* 64kB */
889         } else if (query.page_size & 1) {
890                 page_shift = 12; /* 4kB */
891         } else {
892                 dev_dbg(&dev->dev, "no supported direct page size in mask %x",
893                           query.page_size);
894                 goto out_unlock;
895         }
896         /* verify the window * number of ptes will map the partition */
897         /* check largest block * page size > max memory hotplug addr */
898         max_addr = memory_hotplug_max();
899         if (query.largest_available_block < (max_addr >> page_shift)) {
900                 dev_dbg(&dev->dev, "can't map partiton max 0x%llx with %u "
901                           "%llu-sized pages\n", max_addr,  query.largest_available_block,
902                           1ULL << page_shift);
903                 goto out_unlock;
904         }
905         len = order_base_2(max_addr);
906         win64 = kzalloc(sizeof(struct property), GFP_KERNEL);
907         if (!win64) {
908                 dev_info(&dev->dev,
909                         "couldn't allocate property for 64bit dma window\n");
910                 goto out_unlock;
911         }
912         win64->name = kstrdup(DIRECT64_PROPNAME, GFP_KERNEL);
913         win64->value = ddwprop = kmalloc(sizeof(*ddwprop), GFP_KERNEL);
914         win64->length = sizeof(*ddwprop);
915         if (!win64->name || !win64->value) {
916                 dev_info(&dev->dev,
917                         "couldn't allocate property name and value\n");
918                 goto out_free_prop;
919         }
920 
921         ret = create_ddw(dev, ddw_avail, &create, page_shift, len);
922         if (ret != 0)
923                 goto out_free_prop;
924 
925         ddwprop->liobn = cpu_to_be32(create.liobn);
926         ddwprop->dma_base = cpu_to_be64(of_read_number(&create.addr_hi, 2));
927         ddwprop->tce_shift = cpu_to_be32(page_shift);
928         ddwprop->window_shift = cpu_to_be32(len);
929 
930         dev_dbg(&dev->dev, "created tce table LIOBN 0x%x for %s\n",
931                   create.liobn, dn->full_name);
932 
933         window = kzalloc(sizeof(*window), GFP_KERNEL);
934         if (!window)
935                 goto out_clear_window;
936 
937         ret = walk_system_ram_range(0, memblock_end_of_DRAM() >> PAGE_SHIFT,
938                         win64->value, tce_setrange_multi_pSeriesLP_walk);
939         if (ret) {
940                 dev_info(&dev->dev, "failed to map direct window for %s: %d\n",
941                          dn->full_name, ret);
942                 goto out_clear_window;
943         }
944 
945         ret = prom_add_property(pdn, win64);
946         if (ret) {
947                 dev_err(&dev->dev, "unable to add dma window property for %s: %d",
948                          pdn->full_name, ret);
949                 goto out_clear_window;
950         }
951 
952         window->device = pdn;
953         window->prop = ddwprop;
954         spin_lock(&direct_window_list_lock);
955         list_add(&window->list, &direct_window_list);
956         spin_unlock(&direct_window_list_lock);
957 
958         dma_addr = of_read_number(&create.addr_hi, 2);
959         goto out_unlock;
960 
961 out_clear_window:
962         remove_ddw(pdn);
963 
964 out_free_prop:
965         kfree(win64->name);
966         kfree(win64->value);
967         kfree(win64);
968 
969 out_unlock:
970         mutex_unlock(&direct_window_init_mutex);
971         return dma_addr;
972 }
973 
974 static void pci_dma_dev_setup_pSeriesLP(struct pci_dev *dev)
975 {
976         struct device_node *pdn, *dn;
977         struct iommu_table *tbl;
978         const void *dma_window = NULL;
979         struct pci_dn *pci;
980 
981         pr_debug("pci_dma_dev_setup_pSeriesLP: %s\n", pci_name(dev));
982 
983         /* dev setup for LPAR is a little tricky, since the device tree might
984          * contain the dma-window properties per-device and not necessarily
985          * for the bus. So we need to search upwards in the tree until we
986          * either hit a dma-window property, OR find a parent with a table
987          * already allocated.
988          */
989         dn = pci_device_to_OF_node(dev);
990         pr_debug("  node is %s\n", dn->full_name);
991 
992         for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table;
993              pdn = pdn->parent) {
994                 dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
995                 if (dma_window)
996                         break;
997         }
998 
999         if (!pdn || !PCI_DN(pdn)) {
1000                 printk(KERN_WARNING "pci_dma_dev_setup_pSeriesLP: "
1001                        "no DMA window found for pci dev=%s dn=%s\n",
1002                                  pci_name(dev), dn? dn->full_name : "<null>");
1003                 return;
1004         }
1005         pr_debug("  parent is %s\n", pdn->full_name);
1006 
1007         pci = PCI_DN(pdn);
1008         if (!pci->iommu_table) {
1009                 tbl = kzalloc_node(sizeof(struct iommu_table), GFP_KERNEL,
1010                                    pci->phb->node);
1011                 iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
1012                 pci->iommu_table = iommu_init_table(tbl, pci->phb->node);
1013                 pr_debug("  created table: %p\n", pci->iommu_table);
1014         } else {
1015                 pr_debug("  found DMA window, table: %p\n", pci->iommu_table);
1016         }
1017 
1018         set_iommu_table_base(&dev->dev, pci->iommu_table);
1019 }
1020 
1021 static int dma_set_mask_pSeriesLP(struct device *dev, u64 dma_mask)
1022 {
1023         bool ddw_enabled = false;
1024         struct device_node *pdn, *dn;
1025         struct pci_dev *pdev;
1026         const void *dma_window = NULL;
1027         u64 dma_offset;
1028 
1029         if (!dev->dma_mask)
1030                 return -EIO;
1031 
1032         if (!dev_is_pci(dev))
1033                 goto check_mask;
1034 
1035         pdev = to_pci_dev(dev);
1036 
1037         /* only attempt to use a new window if 64-bit DMA is requested */
1038         if (!disable_ddw && dma_mask == DMA_BIT_MASK(64)) {
1039                 dn = pci_device_to_OF_node(pdev);
1040                 dev_dbg(dev, "node is %s\n", dn->full_name);
1041 
1042                 /*
1043                  * the device tree might contain the dma-window properties
1044                  * per-device and not necessarily for the bus. So we need to
1045                  * search upwards in the tree until we either hit a dma-window
1046                  * property, OR find a parent with a table already allocated.
1047                  */
1048                 for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table;
1049                                 pdn = pdn->parent) {
1050                         dma_window = of_get_property(pdn, "ibm,dma-window", NULL);
1051                         if (dma_window)
1052                                 break;
1053                 }
1054                 if (pdn && PCI_DN(pdn)) {
1055                         dma_offset = enable_ddw(pdev, pdn);
1056                         if (dma_offset != 0) {
1057                                 dev_info(dev, "Using 64-bit direct DMA at offset %llx\n", dma_offset);
1058                                 set_dma_offset(dev, dma_offset);
1059                                 set_dma_ops(dev, &dma_direct_ops);
1060                                 ddw_enabled = true;
1061                         }
1062                 }
1063         }
1064 
1065         /* fall back on iommu ops, restore table pointer with ops */
1066         if (!ddw_enabled && get_dma_ops(dev) != &dma_iommu_ops) {
1067                 dev_info(dev, "Restoring 32-bit DMA via iommu\n");
1068                 set_dma_ops(dev, &dma_iommu_ops);
1069                 pci_dma_dev_setup_pSeriesLP(pdev);
1070         }
1071 
1072 check_mask:
1073         if (!dma_supported(dev, dma_mask))
1074                 return -EIO;
1075 
1076         *dev->dma_mask = dma_mask;
1077         return 0;
1078 }
1079 
1080 #else  /* CONFIG_PCI */
1081 #define pci_dma_bus_setup_pSeries       NULL
1082 #define pci_dma_dev_setup_pSeries       NULL
1083 #define pci_dma_bus_setup_pSeriesLP     NULL
1084 #define pci_dma_dev_setup_pSeriesLP     NULL
1085 #define dma_set_mask_pSeriesLP          NULL
1086 #endif /* !CONFIG_PCI */
1087 
1088 static int iommu_mem_notifier(struct notifier_block *nb, unsigned long action,
1089                 void *data)
1090 {
1091         struct direct_window *window;
1092         struct memory_notify *arg = data;
1093         int ret = 0;
1094 
1095         switch (action) {
1096         case MEM_GOING_ONLINE:
1097                 spin_lock(&direct_window_list_lock);
1098                 list_for_each_entry(window, &direct_window_list, list) {
1099                         ret |= tce_setrange_multi_pSeriesLP(arg->start_pfn,
1100                                         arg->nr_pages, window->prop);
1101                         /* XXX log error */
1102                 }
1103                 spin_unlock(&direct_window_list_lock);
1104                 break;
1105         case MEM_CANCEL_ONLINE:
1106         case MEM_OFFLINE:
1107                 spin_lock(&direct_window_list_lock);
1108                 list_for_each_entry(window, &direct_window_list, list) {
1109                         ret |= tce_clearrange_multi_pSeriesLP(arg->start_pfn,
1110                                         arg->nr_pages, window->prop);
1111                         /* XXX log error */
1112                 }
1113                 spin_unlock(&direct_window_list_lock);
1114                 break;
1115         default:
1116                 break;
1117         }
1118         if (ret && action != MEM_CANCEL_ONLINE)
1119                 return NOTIFY_BAD;
1120 
1121         return NOTIFY_OK;
1122 }
1123 
1124 static struct notifier_block iommu_mem_nb = {
1125         .notifier_call = iommu_mem_notifier,
1126 };
1127 
1128 static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
1129 {
1130         int err = NOTIFY_OK;
1131         struct device_node *np = node;
1132         struct pci_dn *pci = PCI_DN(np);
1133         struct direct_window *window;
1134 
1135         switch (action) {
1136         case PSERIES_RECONFIG_REMOVE:
1137                 if (pci && pci->iommu_table)
1138                         iommu_free_table(pci->iommu_table, np->full_name);
1139 
1140                 spin_lock(&direct_window_list_lock);
1141                 list_for_each_entry(window, &direct_window_list, list) {
1142                         if (window->device == np) {
1143                                 list_del(&window->list);
1144                                 kfree(window);
1145                                 break;
1146                         }
1147                 }
1148                 spin_unlock(&direct_window_list_lock);
1149 
1150                 /*
1151                  * Because the notifier runs after isolation of the
1152                  * slot, we are guaranteed any DMA window has already
1153                  * been revoked and the TCEs have been marked invalid,
1154                  * so we don't need a call to remove_ddw(np). However,
1155                  * if an additional notifier action is added before the
1156                  * isolate call, we should update this code for
1157                  * completeness with such a call.
1158                  */
1159                 break;
1160         default:
1161                 err = NOTIFY_DONE;
1162                 break;
1163         }
1164         return err;
1165 }
1166 
1167 static struct notifier_block iommu_reconfig_nb = {
1168         .notifier_call = iommu_reconfig_notifier,
1169 };
1170 
1171 /* These are called very early. */
1172 void iommu_init_early_pSeries(void)
1173 {
1174         if (of_chosen && of_get_property(of_chosen, "linux,iommu-off", NULL))
1175                 return;
1176 
1177         if (firmware_has_feature(FW_FEATURE_LPAR)) {
1178                 if (firmware_has_feature(FW_FEATURE_MULTITCE)) {
1179                         ppc_md.tce_build = tce_buildmulti_pSeriesLP;
1180                         ppc_md.tce_free  = tce_freemulti_pSeriesLP;
1181                 } else {
1182                         ppc_md.tce_build = tce_build_pSeriesLP;
1183                         ppc_md.tce_free  = tce_free_pSeriesLP;
1184                 }
1185                 ppc_md.tce_get   = tce_get_pSeriesLP;
1186                 ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pSeriesLP;
1187                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pSeriesLP;
1188                 ppc_md.dma_set_mask = dma_set_mask_pSeriesLP;
1189         } else {
1190                 ppc_md.tce_build = tce_build_pSeries;
1191                 ppc_md.tce_free  = tce_free_pSeries;
1192                 ppc_md.tce_get   = tce_get_pseries;
1193                 ppc_md.pci_dma_bus_setup = pci_dma_bus_setup_pSeries;
1194                 ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_pSeries;
1195         }
1196 
1197 
1198         pSeries_reconfig_notifier_register(&iommu_reconfig_nb);
1199         register_memory_notifier(&iommu_mem_nb);
1200 
1201         set_pci_dma_ops(&dma_iommu_ops);
1202 }
1203 
1204 static int __init disable_multitce(char *str)
1205 {
1206         if (strcmp(str, "off") == 0 &&
1207             firmware_has_feature(FW_FEATURE_LPAR) &&
1208             firmware_has_feature(FW_FEATURE_MULTITCE)) {
1209                 printk(KERN_INFO "Disabling MULTITCE firmware feature\n");
1210                 ppc_md.tce_build = tce_build_pSeriesLP;
1211                 ppc_md.tce_free  = tce_free_pSeriesLP;
1212                 powerpc_firmware_features &= ~FW_FEATURE_MULTITCE;
1213         }
1214         return 1;
1215 }
1216 
1217 __setup("multitce=", disable_multitce);
1218 

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