2 * arch/ppc64/kernel/pSeries_iommu.c
4 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen, IBM Corporation
8 * Copyright (C) 2004 Olof Johansson <olof@lixom.net>, 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/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>
47 #include <asm/ppc-pci.h>
50 #include "plpar_wrappers.h"
54 extern int is_python(struct device_node *);
56 static void tce_build_pSeries(struct iommu_table *tbl, long index,
57 long npages, unsigned long uaddr,
58 enum dma_data_direction direction)
63 index <<= TCE_PAGE_FACTOR;
64 npages <<= TCE_PAGE_FACTOR;
67 t.te_rdwr = 1; // Read allowed
69 if (direction != DMA_TO_DEVICE)
72 tp = ((union tce_entry *)tbl->it_base) + index;
75 /* can't move this out since we might cross LMB boundary */
76 t.te_rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
78 tp->te_word = t.te_word;
80 uaddr += TCE_PAGE_SIZE;
86 static void tce_free_pSeries(struct iommu_table *tbl, long index, long npages)
91 npages <<= TCE_PAGE_FACTOR;
92 index <<= TCE_PAGE_FACTOR;
95 tp = ((union tce_entry *)tbl->it_base) + index;
98 tp->te_word = t.te_word;
105 static void tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
106 long npages, unsigned long uaddr,
107 enum dma_data_direction direction)
112 tcenum <<= TCE_PAGE_FACTOR;
113 npages <<= TCE_PAGE_FACTOR;
116 tce.te_rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
118 if (direction != DMA_TO_DEVICE)
122 rc = plpar_tce_put((u64)tbl->it_index,
126 if (rc && printk_ratelimit()) {
127 printk("tce_build_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
128 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
129 printk("\ttcenum = 0x%lx\n", (u64)tcenum);
130 printk("\ttce val = 0x%lx\n", tce.te_word );
131 show_stack(current, (unsigned long *)__get_SP());
139 static DEFINE_PER_CPU(void *, tce_page) = NULL;
141 static void tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
142 long npages, unsigned long uaddr,
143 enum dma_data_direction direction)
146 union tce_entry tce, *tcep;
149 if (TCE_PAGE_FACTOR == 0 && npages == 1)
150 return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
153 tcep = __get_cpu_var(tce_page);
155 /* This is safe to do since interrupts are off when we're called
156 * from iommu_alloc{,_sg}()
159 tcep = (void *)__get_free_page(GFP_ATOMIC);
160 /* If allocation fails, fall back to the loop implementation */
162 return tce_build_pSeriesLP(tbl, tcenum, npages,
164 __get_cpu_var(tce_page) = tcep;
167 tcenum <<= TCE_PAGE_FACTOR;
168 npages <<= TCE_PAGE_FACTOR;
171 tce.te_rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
173 if (direction != DMA_TO_DEVICE)
176 /* We can map max one pageful of TCEs at a time */
179 * Set up the page with TCE data, looping through and setting
182 limit = min_t(long, npages, 4096/sizeof(union tce_entry));
184 for (l = 0; l < limit; l++) {
189 rc = plpar_tce_put_indirect((u64)tbl->it_index,
191 (u64)virt_to_abs(tcep),
196 } while (npages > 0 && !rc);
198 if (rc && printk_ratelimit()) {
199 printk("tce_buildmulti_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
200 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
201 printk("\tnpages = 0x%lx\n", (u64)npages);
202 printk("\ttce[0] val = 0x%lx\n", tcep[0].te_word);
203 show_stack(current, (unsigned long *)__get_SP());
207 static void tce_free_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
212 tcenum <<= TCE_PAGE_FACTOR;
213 npages <<= TCE_PAGE_FACTOR;
218 rc = plpar_tce_put((u64)tbl->it_index,
222 if (rc && printk_ratelimit()) {
223 printk("tce_free_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
224 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
225 printk("\ttcenum = 0x%lx\n", (u64)tcenum);
226 printk("\ttce val = 0x%lx\n", tce.te_word );
227 show_stack(current, (unsigned long *)__get_SP());
235 static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
240 tcenum <<= TCE_PAGE_FACTOR;
241 npages <<= TCE_PAGE_FACTOR;
245 rc = plpar_tce_stuff((u64)tbl->it_index,
250 if (rc && printk_ratelimit()) {
251 printk("tce_freemulti_pSeriesLP: plpar_tce_stuff failed\n");
252 printk("\trc = %ld\n", rc);
253 printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
254 printk("\tnpages = 0x%lx\n", (u64)npages);
255 printk("\ttce val = 0x%lx\n", tce.te_word );
256 show_stack(current, (unsigned long *)__get_SP());
260 static void iommu_table_setparms(struct pci_controller *phb,
261 struct device_node *dn,
262 struct iommu_table *tbl)
264 struct device_node *node;
265 unsigned long *basep;
268 node = (struct device_node *)phb->arch_data;
270 basep = (unsigned long *)get_property(node, "linux,tce-base", NULL);
271 sizep = (unsigned int *)get_property(node, "linux,tce-size", NULL);
272 if (basep == NULL || sizep == NULL) {
273 printk(KERN_ERR "PCI_DMA: iommu_table_setparms: %s has "
274 "missing tce entries !\n", dn->full_name);
278 tbl->it_base = (unsigned long)__va(*basep);
279 memset((void *)tbl->it_base, 0, *sizep);
281 tbl->it_busno = phb->bus->number;
283 /* Units of tce entries */
284 tbl->it_offset = phb->dma_window_base_cur >> PAGE_SHIFT;
286 /* Test if we are going over 2GB of DMA space */
287 if (phb->dma_window_base_cur + phb->dma_window_size > 0x80000000ul) {
288 udbg_printf("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
289 panic("PCI_DMA: Unexpected number of IOAs under this PHB.\n");
292 phb->dma_window_base_cur += phb->dma_window_size;
294 /* Set the tce table size - measured in entries */
295 tbl->it_size = phb->dma_window_size >> PAGE_SHIFT;
298 tbl->it_blocksize = 16;
299 tbl->it_type = TCE_PCI;
303 * iommu_table_setparms_lpar
305 * Function: On pSeries LPAR systems, return TCE table info, given a pci bus.
307 * ToDo: properly interpret the ibm,dma-window property. The definition is:
308 * logical-bus-number (1 word)
309 * phys-address (#address-cells words)
310 * size (#cell-size words)
312 * Currently we hard code these sizes (more or less).
314 static void iommu_table_setparms_lpar(struct pci_controller *phb,
315 struct device_node *dn,
316 struct iommu_table *tbl,
317 unsigned int *dma_window)
319 tbl->it_busno = PCI_DN(dn)->bussubno;
321 /* TODO: Parse field size properties properly. */
322 tbl->it_size = (((unsigned long)dma_window[4] << 32) |
323 (unsigned long)dma_window[5]) >> PAGE_SHIFT;
324 tbl->it_offset = (((unsigned long)dma_window[2] << 32) |
325 (unsigned long)dma_window[3]) >> PAGE_SHIFT;
327 tbl->it_index = dma_window[0];
328 tbl->it_blocksize = 16;
329 tbl->it_type = TCE_PCI;
332 static void iommu_bus_setup_pSeries(struct pci_bus *bus)
334 struct device_node *dn;
335 struct iommu_table *tbl;
336 struct device_node *isa_dn, *isa_dn_orig;
337 struct device_node *tmp;
341 DBG("iommu_bus_setup_pSeries, bus %p, bus->self %p\n", bus, bus->self);
343 dn = pci_bus_to_OF_node(bus);
347 /* This is not a root bus, any setup will be done for the
348 * device-side of the bridge in iommu_dev_setup_pSeries().
353 /* Check if the ISA bus on the system is under
356 isa_dn = isa_dn_orig = of_find_node_by_type(NULL, "isa");
358 while (isa_dn && isa_dn != dn)
359 isa_dn = isa_dn->parent;
362 of_node_put(isa_dn_orig);
364 /* Count number of direct PCI children of the PHB.
365 * All PCI device nodes have class-code property, so it's
366 * an easy way to find them.
368 for (children = 0, tmp = dn->child; tmp; tmp = tmp->sibling)
369 if (get_property(tmp, "class-code", NULL))
372 DBG("Children: %d\n", children);
374 /* Calculate amount of DMA window per slot. Each window must be
375 * a power of two (due to pci_alloc_consistent requirements).
377 * Keep 256MB aside for PHBs with ISA.
381 /* No ISA/IDE - just set window size and return */
382 pci->phb->dma_window_size = 0x80000000ul; /* To be divided */
384 while (pci->phb->dma_window_size * children > 0x80000000ul)
385 pci->phb->dma_window_size >>= 1;
386 DBG("No ISA/IDE, window size is 0x%lx\n",
387 pci->phb->dma_window_size);
388 pci->phb->dma_window_base_cur = 0;
393 /* If we have ISA, then we probably have an IDE
394 * controller too. Allocate a 128MB table but
395 * skip the first 128MB to avoid stepping on ISA
398 pci->phb->dma_window_size = 0x8000000ul;
399 pci->phb->dma_window_base_cur = 0x8000000ul;
401 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
403 iommu_table_setparms(pci->phb, dn, tbl);
404 pci->iommu_table = iommu_init_table(tbl);
406 /* Divide the rest (1.75GB) among the children */
407 pci->phb->dma_window_size = 0x80000000ul;
408 while (pci->phb->dma_window_size * children > 0x70000000ul)
409 pci->phb->dma_window_size >>= 1;
411 DBG("ISA/IDE, window size is 0x%lx\n", pci->phb->dma_window_size);
416 static void iommu_bus_setup_pSeriesLP(struct pci_bus *bus)
418 struct iommu_table *tbl;
419 struct device_node *dn, *pdn;
421 unsigned int *dma_window = NULL;
423 DBG("iommu_bus_setup_pSeriesLP, bus %p, bus->self %p\n", bus, bus->self);
425 dn = pci_bus_to_OF_node(bus);
427 /* Find nearest ibm,dma-window, walking up the device tree */
428 for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
429 dma_window = (unsigned int *)get_property(pdn, "ibm,dma-window", NULL);
430 if (dma_window != NULL)
434 if (dma_window == NULL) {
435 DBG("iommu_bus_setup_pSeriesLP: bus %s seems to have no ibm,dma-window property\n", dn->full_name);
440 if (!ppci->iommu_table) {
441 /* Bussubno hasn't been copied yet.
442 * Do it now because iommu_table_setparms_lpar needs it.
445 ppci->bussubno = bus->number;
447 tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table),
450 iommu_table_setparms_lpar(ppci->phb, pdn, tbl, dma_window);
452 ppci->iommu_table = iommu_init_table(tbl);
456 PCI_DN(dn)->iommu_table = ppci->iommu_table;
460 static void iommu_dev_setup_pSeries(struct pci_dev *dev)
462 struct device_node *dn, *mydn;
463 struct iommu_table *tbl;
465 DBG("iommu_dev_setup_pSeries, dev %p (%s)\n", dev, pci_name(dev));
467 mydn = dn = pci_device_to_OF_node(dev);
469 /* If we're the direct child of a root bus, then we need to allocate
470 * an iommu table ourselves. The bus setup code should have setup
471 * the window sizes already.
473 if (!dev->bus->self) {
474 DBG(" --> first child, no bridge. Allocating iommu table.\n");
475 tbl = kmalloc(sizeof(struct iommu_table), GFP_KERNEL);
476 iommu_table_setparms(PCI_DN(dn)->phb, dn, tbl);
477 PCI_DN(mydn)->iommu_table = iommu_init_table(tbl);
482 /* If this device is further down the bus tree, search upwards until
483 * an already allocated iommu table is found and use that.
486 while (dn && PCI_DN(dn) && PCI_DN(dn)->iommu_table == NULL)
489 if (dn && PCI_DN(dn)) {
490 PCI_DN(mydn)->iommu_table = PCI_DN(dn)->iommu_table;
492 DBG("iommu_dev_setup_pSeries, dev %p (%s) has no iommu table\n", dev, pci_name(dev));
496 static int iommu_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
499 struct device_node *np = node;
500 struct pci_dn *pci = PCI_DN(np);
503 case PSERIES_RECONFIG_REMOVE:
504 if (pci && pci->iommu_table &&
505 get_property(np, "ibm,dma-window", NULL))
506 iommu_free_table(np);
515 static struct notifier_block iommu_reconfig_nb = {
516 .notifier_call = iommu_reconfig_notifier,
519 static void iommu_dev_setup_pSeriesLP(struct pci_dev *dev)
521 struct device_node *pdn, *dn;
522 struct iommu_table *tbl;
523 int *dma_window = NULL;
526 DBG("iommu_dev_setup_pSeriesLP, dev %p (%s)\n", dev, pci_name(dev));
528 /* dev setup for LPAR is a little tricky, since the device tree might
529 * contain the dma-window properties per-device and not neccesarily
530 * for the bus. So we need to search upwards in the tree until we
531 * either hit a dma-window property, OR find a parent with a table
534 dn = pci_device_to_OF_node(dev);
536 for (pdn = dn; pdn && PCI_DN(pdn) && !PCI_DN(pdn)->iommu_table;
538 dma_window = (unsigned int *)
539 get_property(pdn, "ibm,dma-window", NULL);
544 /* Check for parent == NULL so we don't try to setup the empty EADS
545 * slots on POWER4 machines.
547 if (dma_window == NULL || pdn->parent == NULL) {
548 DBG("No dma window for device, linking to parent\n");
549 PCI_DN(dn)->iommu_table = PCI_DN(pdn)->iommu_table;
552 DBG("Found DMA window, allocating table\n");
556 if (!pci->iommu_table) {
557 /* iommu_table_setparms_lpar needs bussubno. */
558 pci->bussubno = pci->phb->bus->number;
560 tbl = (struct iommu_table *)kmalloc(sizeof(struct iommu_table),
563 iommu_table_setparms_lpar(pci->phb, pdn, tbl, dma_window);
565 pci->iommu_table = iommu_init_table(tbl);
569 PCI_DN(dn)->iommu_table = pci->iommu_table;
572 static void iommu_bus_setup_null(struct pci_bus *b) { }
573 static void iommu_dev_setup_null(struct pci_dev *d) { }
575 /* These are called very early. */
576 void iommu_init_early_pSeries(void)
578 if (of_chosen && get_property(of_chosen, "linux,iommu-off", NULL)) {
579 /* Direct I/O, IOMMU off */
580 ppc_md.iommu_dev_setup = iommu_dev_setup_null;
581 ppc_md.iommu_bus_setup = iommu_bus_setup_null;
582 pci_direct_iommu_init();
587 if (platform_is_lpar()) {
588 if (firmware_has_feature(FW_FEATURE_MULTITCE)) {
589 ppc_md.tce_build = tce_buildmulti_pSeriesLP;
590 ppc_md.tce_free = tce_freemulti_pSeriesLP;
592 ppc_md.tce_build = tce_build_pSeriesLP;
593 ppc_md.tce_free = tce_free_pSeriesLP;
595 ppc_md.iommu_bus_setup = iommu_bus_setup_pSeriesLP;
596 ppc_md.iommu_dev_setup = iommu_dev_setup_pSeriesLP;
598 ppc_md.tce_build = tce_build_pSeries;
599 ppc_md.tce_free = tce_free_pSeries;
600 ppc_md.iommu_bus_setup = iommu_bus_setup_pSeries;
601 ppc_md.iommu_dev_setup = iommu_dev_setup_pSeries;
605 pSeries_reconfig_notifier_register(&iommu_reconfig_nb);