2 * arch/ppc64/kernel/pSeries_iommu.c
4 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
8 * Copyright (C) 2004 Olof Johansson <olof@austin.ibm.com>, IBM Corporation
10 * Dynamic DMA mapping support, pSeries-specific parts, both SMP and LPAR.
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include <linux/config.h>
29 #include <linux/init.h>
30 #include <linux/types.h>
31 #include <linux/slab.h>
33 #include <linux/spinlock.h>
34 #include <linux/string.h>
35 #include <linux/pci.h>
36 #include <linux/dma-mapping.h>
40 #include <asm/ppcdebug.h>
41 #include <asm/iommu.h>
42 #include <asm/pci-bridge.h>
43 #include <asm/machdep.h>
44 #include <asm/abs_addr.h>
45 #include <asm/plpar_wrappers.h>
46 #include <asm/pSeries_reconfig.h>
47 #include <asm/systemcfg.h>
48 #include <asm/firmware.h>
53 extern int is_python(struct device_node *);
55 static void tce_build_pSeries(struct iommu_table *tbl, long index,
56 long npages, unsigned long uaddr,
57 enum dma_data_direction direction)
63 t.te_rdwr = 1; // Read allowed
65 if (direction != DMA_TO_DEVICE)
68 tp = ((union tce_entry *)tbl->it_base) + index;
71 /* can't move this out since we might cross LMB boundary */
72 t.te_rpn = (virt_to_abs(uaddr)) >> PAGE_SHIFT;
74 tp->te_word = t.te_word;
82 static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
88 tp = ((union tce_entry *)tbl->it_base) + index;
91 tp->te_word = t.te_word;
98 static void tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
99 long npages, unsigned long uaddr,
100 enum dma_data_direction direction)
106 tce.te_rpn = (virt_to_abs(uaddr)) >> PAGE_SHIFT;
108 if (direction != DMA_TO_DEVICE)
112 rc = plpar_tce_put((u64)tbl->it_index,
116 if (rc && printk_ratelimit()) {
117 printk("tce_build_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
118 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
119 printk("\ttcenum = 0x%lx\n", (u64)tcenum);
120 printk("\ttce val = 0x%lx\n", tce.te_word );
121 show_stack(current, (unsigned long *)__get_SP());
129 static DEFINE_PER_CPU(void *, tce_page) = NULL;
131 static void tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
132 long npages, unsigned long uaddr,
133 enum dma_data_direction direction)
136 union tce_entry tce, *tcep;
140 return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
143 tcep = __get_cpu_var(tce_page);
145 /* This is safe to do since interrupts are off when we're called
146 * from iommu_alloc{,_sg}()
149 tcep = (void *)__get_free_page(GFP_ATOMIC);
150 /* If allocation fails, fall back to the loop implementation */
152 return tce_build_pSeriesLP(tbl, tcenum, npages,
154 __get_cpu_var(tce_page) = tcep;
158 tce.te_rpn = (virt_to_abs(uaddr)) >> PAGE_SHIFT;
160 if (direction != DMA_TO_DEVICE)
163 /* We can map max one pageful of TCEs at a time */
166 * Set up the page with TCE data, looping through and setting
169 limit = min_t(long, npages, PAGE_SIZE/sizeof(union tce_entry));
171 for (l = 0; l < limit; l++) {
176 rc = plpar_tce_put_indirect((u64)tbl->it_index,
178 (u64)virt_to_abs(tcep),
183 } while (npages > 0 && !rc);
185 if (rc && printk_ratelimit()) {
186 printk("tce_buildmulti_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
187 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
188 printk("\tnpages = 0x%lx\n", (u64)npages);
189 printk("\ttce[0] val = 0x%lx\n", tcep[0].te_word);
190 show_stack(current, (unsigned long *)__get_SP());
194 static void tce_free_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
202 rc = plpar_tce_put((u64)tbl->it_index,
206 if (rc && printk_ratelimit()) {
207 printk("tce_free_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
208 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
209 printk("\ttcenum = 0x%lx\n", (u64)tcenum);
210 printk("\ttce val = 0x%lx\n", tce.te_word );
211 show_stack(current, (unsigned long *)__get_SP());
219 static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
226 rc = plpar_tce_stuff((u64)tbl->it_index,
231 if (rc && printk_ratelimit()) {
232 printk("tce_freemulti_pSeriesLP: plpar_tce_stuff failed\n");
233 printk("\trc = %ld\n", rc);
234 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
235 printk("\tnpages = 0x%lx\n", (u64)npages);
236 printk("\ttce val = 0x%lx\n", tce.te_word );
237 show_stack(current, (unsigned long *)__get_SP());
241 static void iommu_table_setparms(struct pci_controller *phb,
242 struct device_node *dn,
243 struct iommu_table *tbl)
245 struct device_node *node;
246 unsigned long *basep;
249 node = (struct device_node *)phb->arch_data;
251 basep = (unsigned long *)get_property(node, "linux,tce-base", NULL);
252 sizep = (unsigned int *)get_property(node, "linux,tce-size", NULL);
253 if (basep == NULL || sizep == NULL) {
254 printk(KERN_ERR "PCI_DMA: iommu_table_setparms: %s has "
255 "missing tce entries !\n", dn->full_name);
259 tbl->it_base = (unsigned long)__va(*basep);
260 memset((void *)tbl->it_base, 0, *sizep);
262 tbl->it_busno = phb->bus->number;
264 /* Units of tce entries */
265 tbl->it_offset = phb->dma_window_base_cur >> PAGE_SHIFT;
267 /* Test if we are going over 2GB of DMA space */
268 if (phb->dma_window_base_cur + phb->dma_window_size > 0x80000000ul) {
269 udbg_printf("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
270 panic("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
273 phb->dma_window_base_cur += phb->dma_window_size;
275 /* Set the tce table size - measured in entries */
276 tbl->it_size = phb->dma_window_size >> PAGE_SHIFT;
279 tbl->it_blocksize = 16;
280 tbl->it_type = TCE_PCI;
284 * iommu_table_setparms_lpar
286 * Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
288 * ToDo: properly interpret the ibm,dma-window property. The definition is:
289 * logical-bus-number (1 word)
290 * phys-address (#address-cells words)
291 * size (#cell-size words)
293 * Currently we hard code these sizes (more or less).
295 static void iommu_table_setparms_lpar(struct pci_controller *phb,
296 struct device_node *dn,
297 struct iommu_table *tbl,
298 unsigned int *dma_window)
300 tbl->it_busno = PCI_DN(dn)->bussubno;
302 /* TODO: Parse field size properties properly. */
303 tbl->it_size = (((unsigned long)dma_window[4] << 32) |
304 (unsigned long)dma_window[5]) >> PAGE_SHIFT;
305 tbl->it_offset = (((unsigned long)dma_window[2] << 32) |
306 (unsigned long)dma_window[3]) >> PAGE_SHIFT;
308 tbl->it_index = dma_window[0];
309 tbl->it_blocksize = 16;
310 tbl->it_type = TCE_PCI;
313 static void iommu_bus_setup_pSeries(struct pci_bus *bus)
315 struct device_node *dn;
316 struct iommu_table *tbl;
317 struct device_node *isa_dn, *isa_dn_orig;
318 struct device_node *tmp;
322 DBG("iommu_bus_setup_pSeries, bus %p, bus->self %p\n", bus, bus->self);
324 dn = pci_bus_to_OF_node(bus);
328 /* This is not a root bus, any setup will be done for the
329 * device-side of the bridge in iommu_dev_setup_pSeries().
334 /* Check if the ISA bus on the system is under
337 isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa");
339 while (isa_dn && isa_dn != dn)
340 isa_dn = isa_dn->parent;
343 of_node_put(isa_dn_orig);
345 /* Count number of direct PCI children of the PHB.
346 * All PCI device nodes have class-code property, so it's
347 * an easy way to find them.
349 for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling)
350 if (get_property(tmp, "class-code", NULL))
353 DBG("Children: %d\n", children);
355 /* Calculate amount of DMA window per slot. Each window must be
356 * a power of two (due to pci_alloc_consistent requirements).
358 * Keep 256MB aside for PHBs with ISA.
362 /* No ISA/IDE - just set window size and return */
363 pci->phb->dma_window_size = 0x80000000ul; /* To be divided */
365 while (pci->phb->dma_window_size * children > 0x80000000ul)
366 pci->phb->dma_window_size >>= 1;
367 DBG("No ISA/IDE, window size is 0x%lx\n",
368 pci->phb->dma_window_size);
369 pci->phb->dma_window_base_cur = 0;
374 /* If we have ISA, then we probably have an IDE
375 * controller too. Allocate a 128MB table but
376 * skip the first 128MB to avoid stepping on ISA
379 pci->phb->dma_window_size = 0x8000000ul;
380 pci->phb->dma_window_base_cur = 0x8000000ul;
382 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
384 iommu_table_setparms(pci->phb, dn, tbl);
385 pci->iommu_table = iommu_init_table(tbl);
387 /* Divide the rest (1.75GB) among the children */
388 pci->phb->dma_window_size = 0x80000000ul;
389 while (pci->phb->dma_window_size * children > 0x70000000ul)
390 pci->phb->dma_window_size >>= 1;
392 DBG("ISA/IDE, window size is 0x%lx\n", pci->phb->dma_window_size);
397 static void iommu_bus_setup_pSeriesLP(struct pci_bus *bus)
399 struct iommu_table *tbl;
400 struct device_node *dn, *pdn;
402 unsigned int *dma_window = NULL;
404 DBG("iommu_bus_setup_pSeriesLP, bus %p, bus->self %p\n", bus, bus->self);
406 dn = pci_bus_to_OF_node(bus);
408 /* Find nearest ibm,dma-window, walking up the device tree */
409 for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
410 dma_window = (unsigned int *)get_property(pdn, "ibm,dma-window", NULL);
411 if (dma_window != NULL)
415 if (dma_window == NULL) {
416 DBG("iommu_bus_setup_pSeriesLP: bus %s seems to have no ibm,dma-window property\n", dn->full_name);
421 if (!ppci->iommu_table) {
422 /* Bussubno hasn't been copied yet.
423 * Do it now because iommu_table_setparms_lpar needs it.
426 ppci->bussubno = bus->number;
428 tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table),
431 iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
433 ppci->iommu_table = iommu_init_table(tbl);
437 PCI_DN(dn)->iommu_table = ppci->iommu_table;
441 static void iommu_dev_setup_pSeries(struct pci_dev *dev)
443 struct device_node *dn, *mydn;
444 struct iommu_table *tbl;
446 DBG("iommu_dev_setup_pSeries, dev %p (%s)\n", dev, pci_name(dev));
448 mydn = dn = pci_device_to_OF_node(dev);
450 /* If we're the direct child of a root bus, then we need to allocate
451 * an iommu table ourselves. The bus setup code should have setup
452 * the window sizes already.
454 if (!dev->bus->self) {
455 DBG(" --> first child, no bridge. Allocating iommu table.\n");
456 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
457 iommu_table_setparms(PCI_DN(dn)->phb, dn, tbl);
458 PCI_DN(mydn)->iommu_table = iommu_init_table(tbl);
463 /* If this device is further down the bus tree, search upwards until
464 * an already allocated iommu table is found and use that.
467 while (dn && dn->data && PCI_DN(dn)->iommu_table == NULL)
470 if (dn && dn->data) {
471 PCI_DN(mydn)->iommu_table = PCI_DN(dn)->iommu_table;
473 DBG("iommu_dev_setup_pSeries, dev %p (%s) has no iommu table\n", dev, pci_name(dev));
477 static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
480 struct device_node *np = node;
481 struct pci_dn *pci = np->data;
484 case PSERIES_RECONFIG_REMOVE:
485 if (pci->iommu_table &&
486 get_property(np, "ibm,dma-window", NULL))
487 iommu_free_table(np);
496 static struct notifier_block iommu_reconfig_nb = {
497 .notifier_call = iommu_reconfig_notifier,
500 static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
502 struct device_node *pdn, *dn;
503 struct iommu_table *tbl;
504 int *dma_window = NULL;
507 DBG("iommu_dev_setup_pSeriesLP, dev %p (%s)\n", dev, pci_name(dev));
509 /* dev setup for LPAR is a little tricky, since the device tree might
510 * contain the dma-window properties per-device and not neccesarily
511 * for the bus. So we need to search upwards in the tree until we
512 * either hit a dma-window property, OR find a parent with a table
515 dn = pci_device_to_OF_node(dev);
517 for (pdn = dn; pdn && pdn->data && !PCI_DN(pdn)->iommu_table;
519 dma_window = (unsigned int *)
520 get_property(pdn, "ibm,dma-window", NULL);
525 /* Check for parent == NULL so we don't try to setup the empty EADS
526 * slots on POWER4 machines.
528 if (dma_window == NULL || pdn->parent == NULL) {
529 DBG("No dma window for device, linking to parent\n");
530 PCI_DN(dn)->iommu_table = PCI_DN(pdn)->iommu_table;
533 DBG("Found DMA window, allocating table\n");
537 if (!pci->iommu_table) {
538 /* iommu_table_setparms_lpar needs bussubno. */
539 pci->bussubno = pci->phb->bus->number;
541 tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table),
544 iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
546 pci->iommu_table = iommu_init_table(tbl);
550 PCI_DN(dn)->iommu_table = pci->iommu_table;
553 static void iommu_bus_setup_null(struct pci_bus *b) { }
554 static void iommu_dev_setup_null(struct pci_dev *d) { }
556 /* These are called very early. */
557 void iommu_init_early_pSeries(void)
559 if (of_chosen && get_property(of_chosen, "linux,iommu-off", NULL)) {
560 /* Direct I/O, IOMMU off */
561 ppc_md.iommu_dev_setup = iommu_dev_setup_null;
562 ppc_md.iommu_bus_setup = iommu_bus_setup_null;
563 pci_direct_iommu_init();
568 if (systemcfg->platform & PLATFORM_LPAR) {
569 if (firmware_has_feature(FW_FEATURE_MULTITCE)) {
570 ppc_md.tce_build = tce_buildmulti_pSeriesLP;
571 ppc_md.tce_free = tce_freemulti_pSeriesLP;
573 ppc_md.tce_build = tce_build_pSeriesLP;
574 ppc_md.tce_free = tce_free_pSeriesLP;
576 ppc_md.iommu_bus_setup = iommu_bus_setup_pSeriesLP;
577 ppc_md.iommu_dev_setup = iommu_dev_setup_pSeriesLP;
579 ppc_md.tce_build = tce_build_pSeries;
580 ppc_md.tce_free = tce_free_pSeries;
581 ppc_md.iommu_bus_setup = iommu_bus_setup_pSeries;
582 ppc_md.iommu_dev_setup = iommu_dev_setup_pSeries;
586 pSeries_reconfig_notifier_register(&iommu_reconfig_nb);