2 * Support PCI/PCIe on PowerNV platforms
4 * Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/pci.h>
16 #include <linux/debugfs.h>
17 #include <linux/delay.h>
18 #include <linux/string.h>
19 #include <linux/init.h>
20 #include <linux/bootmem.h>
21 #include <linux/irq.h>
23 #include <linux/msi.h>
24 #include <linux/memblock.h>
26 #include <asm/sections.h>
29 #include <asm/pci-bridge.h>
30 #include <asm/machdep.h>
31 #include <asm/msi_bitmap.h>
32 #include <asm/ppc-pci.h>
34 #include <asm/iommu.h>
37 #include <asm/debug.h>
42 #define define_pe_printk_level(func, kern_level) \
43 static int func(const struct pnv_ioda_pe *pe, const char *fmt, ...) \
45 struct va_format vaf; \
50 va_start(args, fmt); \
56 strlcpy(pfix, dev_name(&pe->pdev->dev), \
59 sprintf(pfix, "%04x:%02x ", \
60 pci_domain_nr(pe->pbus), \
62 r = printk(kern_level "pci %s: [PE# %.3d] %pV", \
63 pfix, pe->pe_number, &vaf); \
70 define_pe_printk_level(pe_err, KERN_ERR);
71 define_pe_printk_level(pe_warn, KERN_WARNING);
72 define_pe_printk_level(pe_info, KERN_INFO);
75 * stdcix is only supposed to be used in hypervisor real mode as per
76 * the architecture spec
78 static inline void __raw_rm_writeq(u64 val, volatile void __iomem *paddr)
80 __asm__ __volatile__("stdcix %0,0,%1"
81 : : "r" (val), "r" (paddr) : "memory");
84 static int pnv_ioda_alloc_pe(struct pnv_phb *phb)
89 pe = find_next_zero_bit(phb->ioda.pe_alloc,
90 phb->ioda.total_pe, 0);
91 if (pe >= phb->ioda.total_pe)
92 return IODA_INVALID_PE;
93 } while(test_and_set_bit(pe, phb->ioda.pe_alloc));
95 phb->ioda.pe_array[pe].phb = phb;
96 phb->ioda.pe_array[pe].pe_number = pe;
100 static void pnv_ioda_free_pe(struct pnv_phb *phb, int pe)
102 WARN_ON(phb->ioda.pe_array[pe].pdev);
104 memset(&phb->ioda.pe_array[pe], 0, sizeof(struct pnv_ioda_pe));
105 clear_bit(pe, phb->ioda.pe_alloc);
108 /* Currently those 2 are only used when MSIs are enabled, this will change
109 * but in the meantime, we need to protect them to avoid warnings
111 #ifdef CONFIG_PCI_MSI
112 static struct pnv_ioda_pe *pnv_ioda_get_pe(struct pci_dev *dev)
114 struct pci_controller *hose = pci_bus_to_host(dev->bus);
115 struct pnv_phb *phb = hose->private_data;
116 struct pci_dn *pdn = pci_get_pdn(dev);
120 if (pdn->pe_number == IODA_INVALID_PE)
122 return &phb->ioda.pe_array[pdn->pe_number];
124 #endif /* CONFIG_PCI_MSI */
126 static int pnv_ioda_configure_pe(struct pnv_phb *phb, struct pnv_ioda_pe *pe)
128 struct pci_dev *parent;
129 uint8_t bcomp, dcomp, fcomp;
130 long rc, rid_end, rid;
132 /* Bus validation ? */
136 dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER;
137 fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER;
138 parent = pe->pbus->self;
139 if (pe->flags & PNV_IODA_PE_BUS_ALL)
140 count = pe->pbus->busn_res.end - pe->pbus->busn_res.start + 1;
145 case 1: bcomp = OpalPciBusAll; break;
146 case 2: bcomp = OpalPciBus7Bits; break;
147 case 4: bcomp = OpalPciBus6Bits; break;
148 case 8: bcomp = OpalPciBus5Bits; break;
149 case 16: bcomp = OpalPciBus4Bits; break;
150 case 32: bcomp = OpalPciBus3Bits; break;
152 pr_err("%s: Number of subordinate busses %d"
154 pci_name(pe->pbus->self), count);
155 /* Do an exact match only */
156 bcomp = OpalPciBusAll;
158 rid_end = pe->rid + (count << 8);
160 parent = pe->pdev->bus->self;
161 bcomp = OpalPciBusAll;
162 dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER;
163 fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER;
164 rid_end = pe->rid + 1;
168 * Associate PE in PELT. We need add the PE into the
169 * corresponding PELT-V as well. Otherwise, the error
170 * originated from the PE might contribute to other
173 rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid,
174 bcomp, dcomp, fcomp, OPAL_MAP_PE);
176 pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc);
180 rc = opal_pci_set_peltv(phb->opal_id, pe->pe_number,
181 pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
183 pe_warn(pe, "OPAL error %d adding self to PELTV\n", rc);
184 opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number,
185 OPAL_EEH_ACTION_CLEAR_FREEZE_ALL);
187 /* Add to all parents PELT-V */
189 struct pci_dn *pdn = pci_get_pdn(parent);
190 if (pdn && pdn->pe_number != IODA_INVALID_PE) {
191 rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number,
192 pe->pe_number, OPAL_ADD_PE_TO_DOMAIN);
193 /* XXX What to do in case of error ? */
195 parent = parent->bus->self;
197 /* Setup reverse map */
198 for (rid = pe->rid; rid < rid_end; rid++)
199 phb->ioda.pe_rmap[rid] = pe->pe_number;
201 /* Setup one MVTs on IODA1 */
202 if (phb->type == PNV_PHB_IODA1) {
203 pe->mve_number = pe->pe_number;
204 rc = opal_pci_set_mve(phb->opal_id, pe->mve_number,
207 pe_err(pe, "OPAL error %ld setting up MVE %d\n",
211 rc = opal_pci_set_mve_enable(phb->opal_id,
212 pe->mve_number, OPAL_ENABLE_MVE);
214 pe_err(pe, "OPAL error %ld enabling MVE %d\n",
219 } else if (phb->type == PNV_PHB_IODA2)
225 static void pnv_ioda_link_pe_by_weight(struct pnv_phb *phb,
226 struct pnv_ioda_pe *pe)
228 struct pnv_ioda_pe *lpe;
230 list_for_each_entry(lpe, &phb->ioda.pe_dma_list, dma_link) {
231 if (lpe->dma_weight < pe->dma_weight) {
232 list_add_tail(&pe->dma_link, &lpe->dma_link);
236 list_add_tail(&pe->dma_link, &phb->ioda.pe_dma_list);
239 static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev)
241 /* This is quite simplistic. The "base" weight of a device
242 * is 10. 0 means no DMA is to be accounted for it.
245 /* If it's a bridge, no DMA */
246 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL)
249 /* Reduce the weight of slow USB controllers */
250 if (dev->class == PCI_CLASS_SERIAL_USB_UHCI ||
251 dev->class == PCI_CLASS_SERIAL_USB_OHCI ||
252 dev->class == PCI_CLASS_SERIAL_USB_EHCI)
255 /* Increase the weight of RAID (includes Obsidian) */
256 if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID)
264 static struct pnv_ioda_pe *pnv_ioda_setup_dev_PE(struct pci_dev *dev)
266 struct pci_controller *hose = pci_bus_to_host(dev->bus);
267 struct pnv_phb *phb = hose->private_data;
268 struct pci_dn *pdn = pci_get_pdn(dev);
269 struct pnv_ioda_pe *pe;
273 pr_err("%s: Device tree node not associated properly\n",
277 if (pdn->pe_number != IODA_INVALID_PE)
280 /* PE#0 has been pre-set */
281 if (dev->bus->number == 0)
284 pe_num = pnv_ioda_alloc_pe(phb);
285 if (pe_num == IODA_INVALID_PE) {
286 pr_warning("%s: Not enough PE# available, disabling device\n",
291 /* NOTE: We get only one ref to the pci_dev for the pdn, not for the
292 * pointer in the PE data structure, both should be destroyed at the
293 * same time. However, this needs to be looked at more closely again
294 * once we actually start removing things (Hotplug, SR-IOV, ...)
296 * At some point we want to remove the PDN completely anyways
298 pe = &phb->ioda.pe_array[pe_num];
301 pdn->pe_number = pe_num;
306 pe->rid = dev->bus->number << 8 | pdn->devfn;
308 pe_info(pe, "Associated device to PE\n");
310 if (pnv_ioda_configure_pe(phb, pe)) {
311 /* XXX What do we do here ? */
313 pnv_ioda_free_pe(phb, pe_num);
314 pdn->pe_number = IODA_INVALID_PE;
320 /* Assign a DMA weight to the device */
321 pe->dma_weight = pnv_ioda_dma_weight(dev);
322 if (pe->dma_weight != 0) {
323 phb->ioda.dma_weight += pe->dma_weight;
324 phb->ioda.dma_pe_count++;
328 pnv_ioda_link_pe_by_weight(phb, pe);
332 #endif /* Useful for SRIOV case */
334 static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe)
338 list_for_each_entry(dev, &bus->devices, bus_list) {
339 struct pci_dn *pdn = pci_get_pdn(dev);
342 pr_warn("%s: No device node associated with device !\n",
348 pdn->pe_number = pe->pe_number;
349 pe->dma_weight += pnv_ioda_dma_weight(dev);
350 if ((pe->flags & PNV_IODA_PE_BUS_ALL) && dev->subordinate)
351 pnv_ioda_setup_same_PE(dev->subordinate, pe);
356 * There're 2 types of PCI bus sensitive PEs: One that is compromised of
357 * single PCI bus. Another one that contains the primary PCI bus and its
358 * subordinate PCI devices and buses. The second type of PE is normally
359 * orgiriated by PCIe-to-PCI bridge or PLX switch downstream ports.
361 static void pnv_ioda_setup_bus_PE(struct pci_bus *bus, int all)
363 struct pci_controller *hose = pci_bus_to_host(bus);
364 struct pnv_phb *phb = hose->private_data;
365 struct pnv_ioda_pe *pe;
368 pe_num = pnv_ioda_alloc_pe(phb);
369 if (pe_num == IODA_INVALID_PE) {
370 pr_warning("%s: Not enough PE# available for PCI bus %04x:%02x\n",
371 __func__, pci_domain_nr(bus), bus->number);
375 pe = &phb->ioda.pe_array[pe_num];
376 pe->flags = (all ? PNV_IODA_PE_BUS_ALL : PNV_IODA_PE_BUS);
381 pe->rid = bus->busn_res.start << 8;
385 pe_info(pe, "Secondary bus %d..%d associated with PE#%d\n",
386 bus->busn_res.start, bus->busn_res.end, pe_num);
388 pe_info(pe, "Secondary bus %d associated with PE#%d\n",
389 bus->busn_res.start, pe_num);
391 if (pnv_ioda_configure_pe(phb, pe)) {
392 /* XXX What do we do here ? */
394 pnv_ioda_free_pe(phb, pe_num);
399 /* Associate it with all child devices */
400 pnv_ioda_setup_same_PE(bus, pe);
402 /* Put PE to the list */
403 list_add_tail(&pe->list, &phb->ioda.pe_list);
405 /* Account for one DMA PE if at least one DMA capable device exist
408 if (pe->dma_weight != 0) {
409 phb->ioda.dma_weight += pe->dma_weight;
410 phb->ioda.dma_pe_count++;
414 pnv_ioda_link_pe_by_weight(phb, pe);
417 static void pnv_ioda_setup_PEs(struct pci_bus *bus)
421 pnv_ioda_setup_bus_PE(bus, 0);
423 list_for_each_entry(dev, &bus->devices, bus_list) {
424 if (dev->subordinate) {
425 if (pci_pcie_type(dev) == PCI_EXP_TYPE_PCI_BRIDGE)
426 pnv_ioda_setup_bus_PE(dev->subordinate, 1);
428 pnv_ioda_setup_PEs(dev->subordinate);
434 * Configure PEs so that the downstream PCI buses and devices
435 * could have their associated PE#. Unfortunately, we didn't
436 * figure out the way to identify the PLX bridge yet. So we
437 * simply put the PCI bus and the subordinate behind the root
438 * port to PE# here. The game rule here is expected to be changed
439 * as soon as we can detected PLX bridge correctly.
441 static void pnv_pci_ioda_setup_PEs(void)
443 struct pci_controller *hose, *tmp;
445 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
446 pnv_ioda_setup_PEs(hose->bus);
450 static void pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, struct pci_dev *pdev)
452 struct pci_dn *pdn = pci_get_pdn(pdev);
453 struct pnv_ioda_pe *pe;
456 * The function can be called while the PE#
457 * hasn't been assigned. Do nothing for the
460 if (!pdn || pdn->pe_number == IODA_INVALID_PE)
463 pe = &phb->ioda.pe_array[pdn->pe_number];
464 WARN_ON(get_dma_ops(&pdev->dev) != &dma_iommu_ops);
465 set_iommu_table_base_and_group(&pdev->dev, &pe->tce32_table);
468 static int pnv_pci_ioda_dma_set_mask(struct pnv_phb *phb,
469 struct pci_dev *pdev, u64 dma_mask)
471 struct pci_dn *pdn = pci_get_pdn(pdev);
472 struct pnv_ioda_pe *pe;
476 if (WARN_ON(!pdn || pdn->pe_number == IODA_INVALID_PE))
479 pe = &phb->ioda.pe_array[pdn->pe_number];
480 if (pe->tce_bypass_enabled) {
481 top = pe->tce_bypass_base + memblock_end_of_DRAM() - 1;
482 bypass = (dma_mask >= top);
486 dev_info(&pdev->dev, "Using 64-bit DMA iommu bypass\n");
487 set_dma_ops(&pdev->dev, &dma_direct_ops);
488 set_dma_offset(&pdev->dev, pe->tce_bypass_base);
490 dev_info(&pdev->dev, "Using 32-bit DMA via iommu\n");
491 set_dma_ops(&pdev->dev, &dma_iommu_ops);
492 set_iommu_table_base(&pdev->dev, &pe->tce32_table);
497 static void pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, struct pci_bus *bus)
501 list_for_each_entry(dev, &bus->devices, bus_list) {
502 set_iommu_table_base_and_group(&dev->dev, &pe->tce32_table);
503 if (dev->subordinate)
504 pnv_ioda_setup_bus_dma(pe, dev->subordinate);
508 static void pnv_pci_ioda1_tce_invalidate(struct pnv_ioda_pe *pe,
509 struct iommu_table *tbl,
510 __be64 *startp, __be64 *endp, bool rm)
512 __be64 __iomem *invalidate = rm ?
513 (__be64 __iomem *)pe->tce_inval_reg_phys :
514 (__be64 __iomem *)tbl->it_index;
515 unsigned long start, end, inc;
517 start = __pa(startp);
520 /* BML uses this case for p6/p7/galaxy2: Shift addr and put in node */
525 start |= tbl->it_busno;
526 end |= tbl->it_busno;
527 } else if (tbl->it_type & TCE_PCI_SWINV_PAIR) {
528 /* p7ioc-style invalidation, 2 TCEs per write */
529 start |= (1ull << 63);
533 /* Default (older HW) */
537 end |= inc - 1; /* round up end to be different than start */
539 mb(); /* Ensure above stores are visible */
540 while (start <= end) {
542 __raw_rm_writeq(cpu_to_be64(start), invalidate);
544 __raw_writeq(cpu_to_be64(start), invalidate);
549 * The iommu layer will do another mb() for us on build()
550 * and we don't care on free()
554 static void pnv_pci_ioda2_tce_invalidate(struct pnv_ioda_pe *pe,
555 struct iommu_table *tbl,
556 __be64 *startp, __be64 *endp, bool rm)
558 unsigned long start, end, inc;
559 __be64 __iomem *invalidate = rm ?
560 (__be64 __iomem *)pe->tce_inval_reg_phys :
561 (__be64 __iomem *)tbl->it_index;
563 /* We'll invalidate DMA address in PE scope */
565 start |= (pe->pe_number & 0xFF);
568 /* Figure out the start, end and step */
569 inc = tbl->it_offset + (((u64)startp - tbl->it_base) / sizeof(u64));
570 start |= (inc << 12);
571 inc = tbl->it_offset + (((u64)endp - tbl->it_base) / sizeof(u64));
576 while (start <= end) {
578 __raw_rm_writeq(cpu_to_be64(start), invalidate);
580 __raw_writeq(cpu_to_be64(start), invalidate);
585 void pnv_pci_ioda_tce_invalidate(struct iommu_table *tbl,
586 __be64 *startp, __be64 *endp, bool rm)
588 struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
590 struct pnv_phb *phb = pe->phb;
592 if (phb->type == PNV_PHB_IODA1)
593 pnv_pci_ioda1_tce_invalidate(pe, tbl, startp, endp, rm);
595 pnv_pci_ioda2_tce_invalidate(pe, tbl, startp, endp, rm);
598 static void pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb,
599 struct pnv_ioda_pe *pe, unsigned int base,
603 struct page *tce_mem = NULL;
604 const __be64 *swinvp;
605 struct iommu_table *tbl;
610 /* 256M DMA window, 4K TCE pages, 8 bytes TCE */
611 #define TCE32_TABLE_SIZE ((0x10000000 / 0x1000) * 8)
613 /* XXX FIXME: Handle 64-bit only DMA devices */
614 /* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */
615 /* XXX FIXME: Allocate multi-level tables on PHB3 */
617 /* We shouldn't already have a 32-bit DMA associated */
618 if (WARN_ON(pe->tce32_seg >= 0))
621 /* Grab a 32-bit TCE table */
622 pe->tce32_seg = base;
623 pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n",
624 (base << 28), ((base + segs) << 28) - 1);
626 /* XXX Currently, we allocate one big contiguous table for the
627 * TCEs. We only really need one chunk per 256M of TCE space
628 * (ie per segment) but that's an optimization for later, it
629 * requires some added smarts with our get/put_tce implementation
631 tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
632 get_order(TCE32_TABLE_SIZE * segs));
634 pe_err(pe, " Failed to allocate a 32-bit TCE memory\n");
637 addr = page_address(tce_mem);
638 memset(addr, 0, TCE32_TABLE_SIZE * segs);
641 for (i = 0; i < segs; i++) {
642 rc = opal_pci_map_pe_dma_window(phb->opal_id,
645 __pa(addr) + TCE32_TABLE_SIZE * i,
646 TCE32_TABLE_SIZE, 0x1000);
648 pe_err(pe, " Failed to configure 32-bit TCE table,"
654 /* Setup linux iommu table */
655 tbl = &pe->tce32_table;
656 pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs,
659 /* OPAL variant of P7IOC SW invalidated TCEs */
660 swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
662 /* We need a couple more fields -- an address and a data
663 * to or. Since the bus is only printed out on table free
664 * errors, and on the first pass the data will be a relative
665 * bus number, print that out instead.
668 pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
669 tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
671 tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE |
674 iommu_init_table(tbl, phb->hose->node);
675 iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
678 set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
680 pnv_ioda_setup_bus_dma(pe, pe->pbus);
684 /* XXX Failure: Try to fallback to 64-bit only ? */
685 if (pe->tce32_seg >= 0)
688 __free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs));
691 static void pnv_pci_ioda2_set_bypass(struct iommu_table *tbl, bool enable)
693 struct pnv_ioda_pe *pe = container_of(tbl, struct pnv_ioda_pe,
695 uint16_t window_id = (pe->pe_number << 1 ) + 1;
698 pe_info(pe, "%sabling 64-bit DMA bypass\n", enable ? "En" : "Dis");
700 phys_addr_t top = memblock_end_of_DRAM();
702 top = roundup_pow_of_two(top);
703 rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
709 rc = opal_pci_map_pe_dma_window_real(pe->phb->opal_id,
716 * We might want to reset the DMA ops of all devices on
717 * this PE. However in theory, that shouldn't be necessary
718 * as this is used for VFIO/KVM pass-through and the device
719 * hasn't yet been returned to its kernel driver
723 pe_err(pe, "OPAL error %lld configuring bypass window\n", rc);
725 pe->tce_bypass_enabled = enable;
728 static void pnv_pci_ioda2_setup_bypass_pe(struct pnv_phb *phb,
729 struct pnv_ioda_pe *pe)
731 /* TVE #1 is selected by PCI address bit 59 */
732 pe->tce_bypass_base = 1ull << 59;
734 /* Install set_bypass callback for VFIO */
735 pe->tce32_table.set_bypass = pnv_pci_ioda2_set_bypass;
737 /* Enable bypass by default */
738 pnv_pci_ioda2_set_bypass(&pe->tce32_table, true);
741 static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb,
742 struct pnv_ioda_pe *pe)
744 struct page *tce_mem = NULL;
746 const __be64 *swinvp;
747 struct iommu_table *tbl;
748 unsigned int tce_table_size, end;
751 /* We shouldn't already have a 32-bit DMA associated */
752 if (WARN_ON(pe->tce32_seg >= 0))
755 /* The PE will reserve all possible 32-bits space */
757 end = (1 << ilog2(phb->ioda.m32_pci_base));
758 tce_table_size = (end / 0x1000) * 8;
759 pe_info(pe, "Setting up 32-bit TCE table at 0..%08x\n",
762 /* Allocate TCE table */
763 tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL,
764 get_order(tce_table_size));
766 pe_err(pe, "Failed to allocate a 32-bit TCE memory\n");
769 addr = page_address(tce_mem);
770 memset(addr, 0, tce_table_size);
773 * Map TCE table through TVT. The TVE index is the PE number
774 * shifted by 1 bit for 32-bits DMA space.
776 rc = opal_pci_map_pe_dma_window(phb->opal_id, pe->pe_number,
777 pe->pe_number << 1, 1, __pa(addr),
778 tce_table_size, 0x1000);
780 pe_err(pe, "Failed to configure 32-bit TCE table,"
785 /* Setup linux iommu table */
786 tbl = &pe->tce32_table;
787 pnv_pci_setup_iommu_table(tbl, addr, tce_table_size, 0);
789 /* OPAL variant of PHB3 invalidated TCEs */
790 swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL);
792 /* We need a couple more fields -- an address and a data
793 * to or. Since the bus is only printed out on table free
794 * errors, and on the first pass the data will be a relative
795 * bus number, print that out instead.
798 pe->tce_inval_reg_phys = be64_to_cpup(swinvp);
799 tbl->it_index = (unsigned long)ioremap(pe->tce_inval_reg_phys,
801 tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE;
803 iommu_init_table(tbl, phb->hose->node);
804 iommu_register_group(tbl, pci_domain_nr(pe->pbus), pe->pe_number);
807 set_iommu_table_base_and_group(&pe->pdev->dev, tbl);
809 pnv_ioda_setup_bus_dma(pe, pe->pbus);
811 /* Also create a bypass window */
812 pnv_pci_ioda2_setup_bypass_pe(phb, pe);
815 if (pe->tce32_seg >= 0)
818 __free_pages(tce_mem, get_order(tce_table_size));
821 static void pnv_ioda_setup_dma(struct pnv_phb *phb)
823 struct pci_controller *hose = phb->hose;
824 unsigned int residual, remaining, segs, tw, base;
825 struct pnv_ioda_pe *pe;
827 /* If we have more PE# than segments available, hand out one
828 * per PE until we run out and let the rest fail. If not,
829 * then we assign at least one segment per PE, plus more based
830 * on the amount of devices under that PE
832 if (phb->ioda.dma_pe_count > phb->ioda.tce32_count)
835 residual = phb->ioda.tce32_count -
836 phb->ioda.dma_pe_count;
838 pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n",
839 hose->global_number, phb->ioda.tce32_count);
840 pr_info("PCI: %d PE# for a total weight of %d\n",
841 phb->ioda.dma_pe_count, phb->ioda.dma_weight);
843 /* Walk our PE list and configure their DMA segments, hand them
844 * out one base segment plus any residual segments based on
847 remaining = phb->ioda.tce32_count;
848 tw = phb->ioda.dma_weight;
850 list_for_each_entry(pe, &phb->ioda.pe_dma_list, dma_link) {
854 pe_warn(pe, "No DMA32 resources available\n");
859 segs += ((pe->dma_weight * residual) + (tw / 2)) / tw;
860 if (segs > remaining)
865 * For IODA2 compliant PHB3, we needn't care about the weight.
866 * The all available 32-bits DMA space will be assigned to
869 if (phb->type == PNV_PHB_IODA1) {
870 pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n",
871 pe->dma_weight, segs);
872 pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs);
874 pe_info(pe, "Assign DMA32 space\n");
876 pnv_pci_ioda2_setup_dma_pe(phb, pe);
884 #ifdef CONFIG_PCI_MSI
885 static void pnv_ioda2_msi_eoi(struct irq_data *d)
887 unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d);
888 struct irq_chip *chip = irq_data_get_irq_chip(d);
889 struct pnv_phb *phb = container_of(chip, struct pnv_phb,
893 rc = opal_pci_msi_eoi(phb->opal_id, hw_irq);
899 static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev,
900 unsigned int hwirq, unsigned int virq,
901 unsigned int is_64, struct msi_msg *msg)
903 struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev);
904 struct pci_dn *pdn = pci_get_pdn(dev);
905 struct irq_data *idata;
906 struct irq_chip *ichip;
907 unsigned int xive_num = hwirq - phb->msi_base;
911 /* No PE assigned ? bail out ... no MSI for you ! */
915 /* Check if we have an MVE */
916 if (pe->mve_number < 0)
919 /* Force 32-bit MSI on some broken devices */
920 if (pdn && pdn->force_32bit_msi)
923 /* Assign XIVE to PE */
924 rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num);
926 pr_warn("%s: OPAL error %d setting XIVE %d PE\n",
927 pci_name(dev), rc, xive_num);
934 rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1,
937 pr_warn("%s: OPAL error %d getting 64-bit MSI data\n",
941 msg->address_hi = be64_to_cpu(addr64) >> 32;
942 msg->address_lo = be64_to_cpu(addr64) & 0xfffffffful;
946 rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1,
949 pr_warn("%s: OPAL error %d getting 32-bit MSI data\n",
954 msg->address_lo = be32_to_cpu(addr32);
956 msg->data = be32_to_cpu(data);
959 * Change the IRQ chip for the MSI interrupts on PHB3.
960 * The corresponding IRQ chip should be populated for
963 if (phb->type == PNV_PHB_IODA2) {
964 if (!phb->ioda.irq_chip_init) {
965 idata = irq_get_irq_data(virq);
966 ichip = irq_data_get_irq_chip(idata);
967 phb->ioda.irq_chip_init = 1;
968 phb->ioda.irq_chip = *ichip;
969 phb->ioda.irq_chip.irq_eoi = pnv_ioda2_msi_eoi;
972 irq_set_chip(virq, &phb->ioda.irq_chip);
975 pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d),"
976 " address=%x_%08x data=%x PE# %d\n",
977 pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num,
978 msg->address_hi, msg->address_lo, data, pe->pe_number);
983 static void pnv_pci_init_ioda_msis(struct pnv_phb *phb)
986 const __be32 *prop = of_get_property(phb->hose->dn,
987 "ibm,opal-msi-ranges", NULL);
990 prop = of_get_property(phb->hose->dn, "msi-ranges", NULL);
995 phb->msi_base = be32_to_cpup(prop);
996 count = be32_to_cpup(prop + 1);
997 if (msi_bitmap_alloc(&phb->msi_bmp, count, phb->hose->dn)) {
998 pr_err("PCI %d: Failed to allocate MSI bitmap !\n",
999 phb->hose->global_number);
1003 phb->msi_setup = pnv_pci_ioda_msi_setup;
1004 phb->msi32_support = 1;
1005 pr_info(" Allocated bitmap for %d MSIs (base IRQ 0x%x)\n",
1006 count, phb->msi_base);
1009 static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { }
1010 #endif /* CONFIG_PCI_MSI */
1013 * This function is supposed to be called on basis of PE from top
1014 * to bottom style. So the the I/O or MMIO segment assigned to
1015 * parent PE could be overrided by its child PEs if necessary.
1017 static void pnv_ioda_setup_pe_seg(struct pci_controller *hose,
1018 struct pnv_ioda_pe *pe)
1020 struct pnv_phb *phb = hose->private_data;
1021 struct pci_bus_region region;
1022 struct resource *res;
1027 * NOTE: We only care PCI bus based PE for now. For PCI
1028 * device based PE, for example SRIOV sensitive VF should
1029 * be figured out later.
1031 BUG_ON(!(pe->flags & (PNV_IODA_PE_BUS | PNV_IODA_PE_BUS_ALL)));
1033 pci_bus_for_each_resource(pe->pbus, res, i) {
1034 if (!res || !res->flags ||
1035 res->start > res->end)
1038 if (res->flags & IORESOURCE_IO) {
1039 region.start = res->start - phb->ioda.io_pci_base;
1040 region.end = res->end - phb->ioda.io_pci_base;
1041 index = region.start / phb->ioda.io_segsize;
1043 while (index < phb->ioda.total_pe &&
1044 region.start <= region.end) {
1045 phb->ioda.io_segmap[index] = pe->pe_number;
1046 rc = opal_pci_map_pe_mmio_window(phb->opal_id,
1047 pe->pe_number, OPAL_IO_WINDOW_TYPE, 0, index);
1048 if (rc != OPAL_SUCCESS) {
1049 pr_err("%s: OPAL error %d when mapping IO "
1050 "segment #%d to PE#%d\n",
1051 __func__, rc, index, pe->pe_number);
1055 region.start += phb->ioda.io_segsize;
1058 } else if (res->flags & IORESOURCE_MEM) {
1059 /* WARNING: Assumes M32 is mem region 0 in PHB. We need to
1060 * harden that algorithm when we start supporting M64
1062 region.start = res->start -
1063 hose->mem_offset[0] -
1064 phb->ioda.m32_pci_base;
1065 region.end = res->end -
1066 hose->mem_offset[0] -
1067 phb->ioda.m32_pci_base;
1068 index = region.start / phb->ioda.m32_segsize;
1070 while (index < phb->ioda.total_pe &&
1071 region.start <= region.end) {
1072 phb->ioda.m32_segmap[index] = pe->pe_number;
1073 rc = opal_pci_map_pe_mmio_window(phb->opal_id,
1074 pe->pe_number, OPAL_M32_WINDOW_TYPE, 0, index);
1075 if (rc != OPAL_SUCCESS) {
1076 pr_err("%s: OPAL error %d when mapping M32 "
1077 "segment#%d to PE#%d",
1078 __func__, rc, index, pe->pe_number);
1082 region.start += phb->ioda.m32_segsize;
1089 static void pnv_pci_ioda_setup_seg(void)
1091 struct pci_controller *tmp, *hose;
1092 struct pnv_phb *phb;
1093 struct pnv_ioda_pe *pe;
1095 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
1096 phb = hose->private_data;
1097 list_for_each_entry(pe, &phb->ioda.pe_list, list) {
1098 pnv_ioda_setup_pe_seg(hose, pe);
1103 static void pnv_pci_ioda_setup_DMA(void)
1105 struct pci_controller *hose, *tmp;
1106 struct pnv_phb *phb;
1108 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
1109 pnv_ioda_setup_dma(hose->private_data);
1111 /* Mark the PHB initialization done */
1112 phb = hose->private_data;
1113 phb->initialized = 1;
1117 static void pnv_pci_ioda_create_dbgfs(void)
1119 #ifdef CONFIG_DEBUG_FS
1120 struct pci_controller *hose, *tmp;
1121 struct pnv_phb *phb;
1124 list_for_each_entry_safe(hose, tmp, &hose_list, list_node) {
1125 phb = hose->private_data;
1127 sprintf(name, "PCI%04x", hose->global_number);
1128 phb->dbgfs = debugfs_create_dir(name, powerpc_debugfs_root);
1130 pr_warning("%s: Error on creating debugfs on PHB#%x\n",
1131 __func__, hose->global_number);
1133 #endif /* CONFIG_DEBUG_FS */
1136 static void pnv_pci_ioda_fixup(void)
1138 pnv_pci_ioda_setup_PEs();
1139 pnv_pci_ioda_setup_seg();
1140 pnv_pci_ioda_setup_DMA();
1142 pnv_pci_ioda_create_dbgfs();
1145 eeh_probe_mode_set(EEH_PROBE_MODE_DEV);
1146 eeh_addr_cache_build();
1152 * Returns the alignment for I/O or memory windows for P2P
1153 * bridges. That actually depends on how PEs are segmented.
1154 * For now, we return I/O or M32 segment size for PE sensitive
1155 * P2P bridges. Otherwise, the default values (4KiB for I/O,
1156 * 1MiB for memory) will be returned.
1158 * The current PCI bus might be put into one PE, which was
1159 * create against the parent PCI bridge. For that case, we
1160 * needn't enlarge the alignment so that we can save some
1163 static resource_size_t pnv_pci_window_alignment(struct pci_bus *bus,
1166 struct pci_dev *bridge;
1167 struct pci_controller *hose = pci_bus_to_host(bus);
1168 struct pnv_phb *phb = hose->private_data;
1169 int num_pci_bridges = 0;
1173 if (pci_pcie_type(bridge) == PCI_EXP_TYPE_PCI_BRIDGE) {
1175 if (num_pci_bridges >= 2)
1179 bridge = bridge->bus->self;
1182 /* We need support prefetchable memory window later */
1183 if (type & IORESOURCE_MEM)
1184 return phb->ioda.m32_segsize;
1186 return phb->ioda.io_segsize;
1189 /* Prevent enabling devices for which we couldn't properly
1192 static int pnv_pci_enable_device_hook(struct pci_dev *dev)
1194 struct pci_controller *hose = pci_bus_to_host(dev->bus);
1195 struct pnv_phb *phb = hose->private_data;
1198 /* The function is probably called while the PEs have
1199 * not be created yet. For example, resource reassignment
1200 * during PCI probe period. We just skip the check if
1203 if (!phb->initialized)
1206 pdn = pci_get_pdn(dev);
1207 if (!pdn || pdn->pe_number == IODA_INVALID_PE)
1213 static u32 pnv_ioda_bdfn_to_pe(struct pnv_phb *phb, struct pci_bus *bus,
1216 return phb->ioda.pe_rmap[(bus->number << 8) | devfn];
1219 static void pnv_pci_ioda_shutdown(struct pnv_phb *phb)
1221 opal_pci_reset(phb->opal_id, OPAL_PCI_IODA_TABLE_RESET,
1225 void __init pnv_pci_init_ioda_phb(struct device_node *np,
1226 u64 hub_id, int ioda_type)
1228 struct pci_controller *hose;
1229 struct pnv_phb *phb;
1230 unsigned long size, m32map_off, pemap_off, iomap_off = 0;
1231 const __be64 *prop64;
1232 const __be32 *prop32;
1238 pr_info("Initializing IODA%d OPAL PHB %s\n", ioda_type, np->full_name);
1240 prop64 = of_get_property(np, "ibm,opal-phbid", NULL);
1242 pr_err(" Missing \"ibm,opal-phbid\" property !\n");
1245 phb_id = be64_to_cpup(prop64);
1246 pr_debug(" PHB-ID : 0x%016llx\n", phb_id);
1248 phb = alloc_bootmem(sizeof(struct pnv_phb));
1250 pr_err(" Out of memory !\n");
1254 /* Allocate PCI controller */
1255 memset(phb, 0, sizeof(struct pnv_phb));
1256 phb->hose = hose = pcibios_alloc_controller(np);
1258 pr_err(" Can't allocate PCI controller for %s\n",
1260 free_bootmem((unsigned long)phb, sizeof(struct pnv_phb));
1264 spin_lock_init(&phb->lock);
1265 prop32 = of_get_property(np, "bus-range", &len);
1266 if (prop32 && len == 8) {
1267 hose->first_busno = be32_to_cpu(prop32[0]);
1268 hose->last_busno = be32_to_cpu(prop32[1]);
1270 pr_warn(" Broken <bus-range> on %s\n", np->full_name);
1271 hose->first_busno = 0;
1272 hose->last_busno = 0xff;
1274 hose->private_data = phb;
1275 phb->hub_id = hub_id;
1276 phb->opal_id = phb_id;
1277 phb->type = ioda_type;
1279 /* Detect specific models for error handling */
1280 if (of_device_is_compatible(np, "ibm,p7ioc-pciex"))
1281 phb->model = PNV_PHB_MODEL_P7IOC;
1282 else if (of_device_is_compatible(np, "ibm,power8-pciex"))
1283 phb->model = PNV_PHB_MODEL_PHB3;
1285 phb->model = PNV_PHB_MODEL_UNKNOWN;
1287 /* Parse 32-bit and IO ranges (if any) */
1288 pci_process_bridge_OF_ranges(hose, np, !hose->global_number);
1291 phb->regs = of_iomap(np, 0);
1292 if (phb->regs == NULL)
1293 pr_err(" Failed to map registers !\n");
1295 /* Initialize more IODA stuff */
1296 phb->ioda.total_pe = 1;
1297 prop32 = of_get_property(np, "ibm,opal-num-pes", NULL);
1299 phb->ioda.total_pe = be32_to_cpup(prop32);
1300 prop32 = of_get_property(np, "ibm,opal-reserved-pe", NULL);
1302 phb->ioda.reserved_pe = be32_to_cpup(prop32);
1303 phb->ioda.m32_size = resource_size(&hose->mem_resources[0]);
1304 /* FW Has already off top 64k of M32 space (MSI space) */
1305 phb->ioda.m32_size += 0x10000;
1307 phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe;
1308 phb->ioda.m32_pci_base = hose->mem_resources[0].start - hose->mem_offset[0];
1309 phb->ioda.io_size = hose->pci_io_size;
1310 phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe;
1311 phb->ioda.io_pci_base = 0; /* XXX calculate this ? */
1313 /* Allocate aux data & arrays. We don't have IO ports on PHB3 */
1314 size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long));
1316 size += phb->ioda.total_pe * sizeof(phb->ioda.m32_segmap[0]);
1317 if (phb->type == PNV_PHB_IODA1) {
1319 size += phb->ioda.total_pe * sizeof(phb->ioda.io_segmap[0]);
1322 size += phb->ioda.total_pe * sizeof(struct pnv_ioda_pe);
1323 aux = alloc_bootmem(size);
1324 memset(aux, 0, size);
1325 phb->ioda.pe_alloc = aux;
1326 phb->ioda.m32_segmap = aux + m32map_off;
1327 if (phb->type == PNV_PHB_IODA1)
1328 phb->ioda.io_segmap = aux + iomap_off;
1329 phb->ioda.pe_array = aux + pemap_off;
1330 set_bit(phb->ioda.reserved_pe, phb->ioda.pe_alloc);
1332 INIT_LIST_HEAD(&phb->ioda.pe_dma_list);
1333 INIT_LIST_HEAD(&phb->ioda.pe_list);
1335 /* Calculate how many 32-bit TCE segments we have */
1336 phb->ioda.tce32_count = phb->ioda.m32_pci_base >> 28;
1338 /* Clear unusable m64 */
1339 hose->mem_resources[1].flags = 0;
1340 hose->mem_resources[1].start = 0;
1341 hose->mem_resources[1].end = 0;
1342 hose->mem_resources[2].flags = 0;
1343 hose->mem_resources[2].start = 0;
1344 hose->mem_resources[2].end = 0;
1346 #if 0 /* We should really do that ... */
1347 rc = opal_pci_set_phb_mem_window(opal->phb_id,
1350 starting_real_address,
1351 starting_pci_address,
1355 pr_info(" %d (%d) PE's M32: 0x%x [segment=0x%x]"
1356 " IO: 0x%x [segment=0x%x]\n",
1358 phb->ioda.reserved_pe,
1359 phb->ioda.m32_size, phb->ioda.m32_segsize,
1360 phb->ioda.io_size, phb->ioda.io_segsize);
1362 phb->hose->ops = &pnv_pci_ops;
1364 phb->eeh_ops = &ioda_eeh_ops;
1367 /* Setup RID -> PE mapping function */
1368 phb->bdfn_to_pe = pnv_ioda_bdfn_to_pe;
1371 phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup;
1372 phb->dma_set_mask = pnv_pci_ioda_dma_set_mask;
1374 /* Setup shutdown function for kexec */
1375 phb->shutdown = pnv_pci_ioda_shutdown;
1377 /* Setup MSI support */
1378 pnv_pci_init_ioda_msis(phb);
1381 * We pass the PCI probe flag PCI_REASSIGN_ALL_RSRC here
1382 * to let the PCI core do resource assignment. It's supposed
1383 * that the PCI core will do correct I/O and MMIO alignment
1384 * for the P2P bridge bars so that each PCI bus (excluding
1385 * the child P2P bridges) can form individual PE.
1387 ppc_md.pcibios_fixup = pnv_pci_ioda_fixup;
1388 ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook;
1389 ppc_md.pcibios_window_alignment = pnv_pci_window_alignment;
1390 pci_add_flags(PCI_REASSIGN_ALL_RSRC);
1392 /* Reset IODA tables to a clean state */
1393 rc = opal_pci_reset(phb_id, OPAL_PCI_IODA_TABLE_RESET, OPAL_ASSERT_RESET);
1395 pr_warning(" OPAL Error %ld performing IODA table reset !\n", rc);
1398 void __init pnv_pci_init_ioda2_phb(struct device_node *np)
1400 pnv_pci_init_ioda_phb(np, 0, PNV_PHB_IODA2);
1403 void __init pnv_pci_init_ioda_hub(struct device_node *np)
1405 struct device_node *phbn;
1406 const __be64 *prop64;
1409 pr_info("Probing IODA IO-Hub %s\n", np->full_name);
1411 prop64 = of_get_property(np, "ibm,opal-hubid", NULL);
1413 pr_err(" Missing \"ibm,opal-hubid\" property !\n");
1416 hub_id = be64_to_cpup(prop64);
1417 pr_devel(" HUB-ID : 0x%016llx\n", hub_id);
1419 /* Count child PHBs */
1420 for_each_child_of_node(np, phbn) {
1421 /* Look for IODA1 PHBs */
1422 if (of_device_is_compatible(phbn, "ibm,ioda-phb"))
1423 pnv_pci_init_ioda_phb(phbn, hub_id, PNV_PHB_IODA1);