diff options
Diffstat (limited to 'arch/powerpc/platforms/powernv/pci-ioda.c')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 1330 |
1 files changed, 1330 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c new file mode 100644 index 00000000000..f31162cfdaa --- /dev/null +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -0,0 +1,1330 @@ +/* + * Support PCI/PCIe on PowerNV platforms + * + * Copyright 2011 Benjamin Herrenschmidt, IBM Corp. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +#undef DEBUG + +#include <linux/kernel.h> +#include <linux/pci.h> +#include <linux/delay.h> +#include <linux/string.h> +#include <linux/init.h> +#include <linux/bootmem.h> +#include <linux/irq.h> +#include <linux/io.h> +#include <linux/msi.h> + +#include <asm/sections.h> +#include <asm/io.h> +#include <asm/prom.h> +#include <asm/pci-bridge.h> +#include <asm/machdep.h> +#include <asm/ppc-pci.h> +#include <asm/opal.h> +#include <asm/iommu.h> +#include <asm/tce.h> +#include <asm/abs_addr.h> + +#include "powernv.h" +#include "pci.h" + +struct resource_wrap { + struct list_head link; + resource_size_t size; + resource_size_t align; + struct pci_dev *dev; /* Set if it's a device */ + struct pci_bus *bus; /* Set if it's a bridge */ +}; + +static int __pe_printk(const char *level, const struct pnv_ioda_pe *pe, + struct va_format *vaf) +{ + char pfix[32]; + + if (pe->pdev) + strlcpy(pfix, dev_name(&pe->pdev->dev), sizeof(pfix)); + else + sprintf(pfix, "%04x:%02x ", + pci_domain_nr(pe->pbus), pe->pbus->number); + return printk("pci %s%s: [PE# %.3d] %pV", level, pfix, pe->pe_number, vaf); +} + +#define define_pe_printk_level(func, kern_level) \ +static int func(const struct pnv_ioda_pe *pe, const char *fmt, ...) \ +{ \ + struct va_format vaf; \ + va_list args; \ + int r; \ + \ + va_start(args, fmt); \ + \ + vaf.fmt = fmt; \ + vaf.va = &args; \ + \ + r = __pe_printk(kern_level, pe, &vaf); \ + va_end(args); \ + \ + return r; \ +} \ + +define_pe_printk_level(pe_err, KERN_ERR); +define_pe_printk_level(pe_warn, KERN_WARNING); +define_pe_printk_level(pe_info, KERN_INFO); + + +/* Calculate resource usage & alignment requirement of a single + * device. This will also assign all resources within the device + * for a given type starting at 0 for the biggest one and then + * assigning in decreasing order of size. + */ +static void __devinit pnv_ioda_calc_dev(struct pci_dev *dev, unsigned int flags, + resource_size_t *size, + resource_size_t *align) +{ + resource_size_t start; + struct resource *r; + int i; + + pr_devel(" -> CDR %s\n", pci_name(dev)); + + *size = *align = 0; + + /* Clear the resources out and mark them all unset */ + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + r = &dev->resource[i]; + if (!(r->flags & flags)) + continue; + if (r->start) { + r->end -= r->start; + r->start = 0; + } + r->flags |= IORESOURCE_UNSET; + } + + /* We currently keep all memory resources together, we + * will handle prefetch & 64-bit separately in the future + * but for now we stick everybody in M32 + */ + start = 0; + for (;;) { + resource_size_t max_size = 0; + int max_no = -1; + + /* Find next biggest resource */ + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + r = &dev->resource[i]; + if (!(r->flags & IORESOURCE_UNSET) || + !(r->flags & flags)) + continue; + if (resource_size(r) > max_size) { + max_size = resource_size(r); + max_no = i; + } + } + if (max_no < 0) + break; + r = &dev->resource[max_no]; + if (max_size > *align) + *align = max_size; + *size += max_size; + r->start = start; + start += max_size; + r->end = r->start + max_size - 1; + r->flags &= ~IORESOURCE_UNSET; + pr_devel(" -> R%d %016llx..%016llx\n", + max_no, r->start, r->end); + } + pr_devel(" <- CDR %s size=%llx align=%llx\n", + pci_name(dev), *size, *align); +} + +/* Allocate a resource "wrap" for a given device or bridge and + * insert it at the right position in the sorted list + */ +static void __devinit pnv_ioda_add_wrap(struct list_head *list, + struct pci_bus *bus, + struct pci_dev *dev, + resource_size_t size, + resource_size_t align) +{ + struct resource_wrap *w1, *w = kzalloc(sizeof(*w), GFP_KERNEL); + + w->size = size; + w->align = align; + w->dev = dev; + w->bus = bus; + + list_for_each_entry(w1, list, link) { + if (w1->align < align) { + list_add_tail(&w->link, &w1->link); + return; + } + } + list_add_tail(&w->link, list); +} + +/* Offset device resources of a given type */ +static void __devinit pnv_ioda_offset_dev(struct pci_dev *dev, + unsigned int flags, + resource_size_t offset) +{ + struct resource *r; + int i; + + pr_devel(" -> ODR %s [%x] +%016llx\n", pci_name(dev), flags, offset); + + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + r = &dev->resource[i]; + if (r->flags & flags) { + dev->resource[i].start += offset; + dev->resource[i].end += offset; + } + } + + pr_devel(" <- ODR %s [%x] +%016llx\n", pci_name(dev), flags, offset); +} + +/* Offset bus resources (& all children) of a given type */ +static void __devinit pnv_ioda_offset_bus(struct pci_bus *bus, + unsigned int flags, + resource_size_t offset) +{ + struct resource *r; + struct pci_dev *dev; + struct pci_bus *cbus; + int i; + + pr_devel(" -> OBR %s [%x] +%016llx\n", + bus->self ? pci_name(bus->self) : "root", flags, offset); + + for (i = 0; i < 2; i++) { + r = bus->resource[i]; + if (r && (r->flags & flags)) { + bus->resource[i]->start += offset; + bus->resource[i]->end += offset; + } + } + list_for_each_entry(dev, &bus->devices, bus_list) + pnv_ioda_offset_dev(dev, flags, offset); + list_for_each_entry(cbus, &bus->children, node) + pnv_ioda_offset_bus(cbus, flags, offset); + + pr_devel(" <- OBR %s [%x]\n", + bus->self ? pci_name(bus->self) : "root", flags); +} + +/* This is the guts of our IODA resource allocation. This is called + * recursively for each bus in the system. It calculates all the + * necessary size and requirements for children and assign them + * resources such that: + * + * - Each function fits in it's own contiguous set of IO/M32 + * segment + * + * - All segments behind a P2P bridge are contiguous and obey + * alignment constraints of those bridges + */ +static void __devinit pnv_ioda_calc_bus(struct pci_bus *bus, unsigned int flags, + resource_size_t *size, + resource_size_t *align) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + struct pnv_phb *phb = hose->private_data; + resource_size_t dev_size, dev_align, start; + resource_size_t min_align, min_balign; + struct pci_dev *cdev; + struct pci_bus *cbus; + struct list_head head; + struct resource_wrap *w; + unsigned int bres; + + *size = *align = 0; + + pr_devel("-> CBR %s [%x]\n", + bus->self ? pci_name(bus->self) : "root", flags); + + /* Calculate alignment requirements based on the type + * of resource we are working on + */ + if (flags & IORESOURCE_IO) { + bres = 0; + min_align = phb->ioda.io_segsize; + min_balign = 0x1000; + } else { + bres = 1; + min_align = phb->ioda.m32_segsize; + min_balign = 0x100000; + } + + /* Gather all our children resources ordered by alignment */ + INIT_LIST_HEAD(&head); + + /* - Busses */ + list_for_each_entry(cbus, &bus->children, node) { + pnv_ioda_calc_bus(cbus, flags, &dev_size, &dev_align); + pnv_ioda_add_wrap(&head, cbus, NULL, dev_size, dev_align); + } + + /* - Devices */ + list_for_each_entry(cdev, &bus->devices, bus_list) { + pnv_ioda_calc_dev(cdev, flags, &dev_size, &dev_align); + /* Align them to segment size */ + if (dev_align < min_align) + dev_align = min_align; + pnv_ioda_add_wrap(&head, NULL, cdev, dev_size, dev_align); + } + if (list_empty(&head)) + goto empty; + + /* Now we can do two things: assign offsets to them within that + * level and get our total alignment & size requirements. The + * assignment algorithm is going to be uber-trivial for now, we + * can try to be smarter later at filling out holes. + */ + start = bus->self ? 0 : bus->resource[bres]->start; + + /* Don't hand out IO 0 */ + if ((flags & IORESOURCE_IO) && !bus->self) + start += 0x1000; + + while(!list_empty(&head)) { + w = list_first_entry(&head, struct resource_wrap, link); + list_del(&w->link); + if (w->size) { + if (start) { + start = ALIGN(start, w->align); + if (w->dev) + pnv_ioda_offset_dev(w->dev,flags,start); + else if (w->bus) + pnv_ioda_offset_bus(w->bus,flags,start); + } + if (w->align > *align) + *align = w->align; + } + start += w->size; + kfree(w); + } + *size = start; + + /* Align and setup bridge resources */ + *align = max_t(resource_size_t, *align, + max_t(resource_size_t, min_align, min_balign)); + *size = ALIGN(*size, + max_t(resource_size_t, min_align, min_balign)); + empty: + /* Only setup P2P's, not the PHB itself */ + if (bus->self) { + WARN_ON(bus->resource[bres] == NULL); + bus->resource[bres]->start = 0; + bus->resource[bres]->flags = (*size) ? flags : 0; + bus->resource[bres]->end = (*size) ? (*size - 1) : 0; + + /* Clear prefetch bus resources for now */ + bus->resource[2]->flags = 0; + } + + pr_devel("<- CBR %s [%x] *size=%016llx *align=%016llx\n", + bus->self ? pci_name(bus->self) : "root", flags,*size,*align); +} + +static struct pci_dn *pnv_ioda_get_pdn(struct pci_dev *dev) +{ + struct device_node *np; + + np = pci_device_to_OF_node(dev); + if (!np) + return NULL; + return PCI_DN(np); +} + +static void __devinit pnv_ioda_setup_pe_segments(struct pci_dev *dev) +{ + struct pci_controller *hose = pci_bus_to_host(dev->bus); + struct pnv_phb *phb = hose->private_data; + struct pci_dn *pdn = pnv_ioda_get_pdn(dev); + unsigned int pe, i; + resource_size_t pos; + struct resource io_res; + struct resource m32_res; + struct pci_bus_region region; + int rc; + + /* Anything not referenced in the device-tree gets PE#0 */ + pe = pdn ? pdn->pe_number : 0; + + /* Calculate the device min/max */ + io_res.start = m32_res.start = (resource_size_t)-1; + io_res.end = m32_res.end = 0; + io_res.flags = IORESOURCE_IO; + m32_res.flags = IORESOURCE_MEM; + + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + struct resource *r = NULL; + if (dev->resource[i].flags & IORESOURCE_IO) + r = &io_res; + if (dev->resource[i].flags & IORESOURCE_MEM) + r = &m32_res; + if (!r) + continue; + if (dev->resource[i].start < r->start) + r->start = dev->resource[i].start; + if (dev->resource[i].end > r->end) + r->end = dev->resource[i].end; + } + + /* Setup IO segments */ + if (io_res.start < io_res.end) { + pcibios_resource_to_bus(dev, ®ion, &io_res); + pos = region.start; + i = pos / phb->ioda.io_segsize; + while(i < phb->ioda.total_pe && pos <= region.end) { + if (phb->ioda.io_segmap[i]) { + pr_err("%s: Trying to use IO seg #%d which is" + " already used by PE# %d\n", + pci_name(dev), i, + phb->ioda.io_segmap[i]); + /* XXX DO SOMETHING TO DISABLE DEVICE ? */ + break; + } + phb->ioda.io_segmap[i] = pe; + rc = opal_pci_map_pe_mmio_window(phb->opal_id, pe, + OPAL_IO_WINDOW_TYPE, + 0, i); + if (rc != OPAL_SUCCESS) { + pr_err("%s: OPAL error %d setting up mapping" + " for IO seg# %d\n", + pci_name(dev), rc, i); + /* XXX DO SOMETHING TO DISABLE DEVICE ? */ + break; + } + pos += phb->ioda.io_segsize; + i++; + }; + } + + /* Setup M32 segments */ + if (m32_res.start < m32_res.end) { + pcibios_resource_to_bus(dev, ®ion, &m32_res); + pos = region.start; + i = pos / phb->ioda.m32_segsize; + while(i < phb->ioda.total_pe && pos <= region.end) { + if (phb->ioda.m32_segmap[i]) { + pr_err("%s: Trying to use M32 seg #%d which is" + " already used by PE# %d\n", + pci_name(dev), i, + phb->ioda.m32_segmap[i]); + /* XXX DO SOMETHING TO DISABLE DEVICE ? */ + break; + } + phb->ioda.m32_segmap[i] = pe; + rc = opal_pci_map_pe_mmio_window(phb->opal_id, pe, + OPAL_M32_WINDOW_TYPE, + 0, i); + if (rc != OPAL_SUCCESS) { + pr_err("%s: OPAL error %d setting up mapping" + " for M32 seg# %d\n", + pci_name(dev), rc, i); + /* XXX DO SOMETHING TO DISABLE DEVICE ? */ + break; + } + pos += phb->ioda.m32_segsize; + i++; + } + } +} + +/* Check if a resource still fits in the total IO or M32 range + * for a given PHB + */ +static int __devinit pnv_ioda_resource_fit(struct pci_controller *hose, + struct resource *r) +{ + struct resource *bounds; + + if (r->flags & IORESOURCE_IO) + bounds = &hose->io_resource; + else if (r->flags & IORESOURCE_MEM) + bounds = &hose->mem_resources[0]; + else + return 1; + + if (r->start >= bounds->start && r->end <= bounds->end) + return 1; + r->flags = 0; + return 0; +} + +static void __devinit pnv_ioda_update_resources(struct pci_bus *bus) +{ + struct pci_controller *hose = pci_bus_to_host(bus); + struct pci_bus *cbus; + struct pci_dev *cdev; + unsigned int i; + + /* We used to clear all device enables here. However it looks like + * clearing MEM enable causes Obsidian (IPR SCS) to go bonkers, + * and shoot fatal errors to the PHB which in turns fences itself + * and we can't recover from that ... yet. So for now, let's leave + * the enables as-is and hope for the best. + */ + + /* Check if bus resources fit in our IO or M32 range */ + for (i = 0; bus->self && (i < 2); i++) { + struct resource *r = bus->resource[i]; + if (r && !pnv_ioda_resource_fit(hose, r)) + pr_err("%s: Bus %d resource %d disabled, no room\n", + pci_name(bus->self), bus->number, i); + } + + /* Update self if it's not a PHB */ + if (bus->self) + pci_setup_bridge(bus); + + /* Update child devices */ + list_for_each_entry(cdev, &bus->devices, bus_list) { + /* Check if resource fits, if not, disabled it */ + for (i = 0; i <= PCI_ROM_RESOURCE; i++) { + struct resource *r = &cdev->resource[i]; + if (!pnv_ioda_resource_fit(hose, r)) + pr_err("%s: Resource %d disabled, no room\n", + pci_name(cdev), i); + } + + /* Assign segments */ + pnv_ioda_setup_pe_segments(cdev); + + /* Update HW BARs */ + for (i = 0; i <= PCI_ROM_RESOURCE; i++) + pci_update_resource(cdev, i); + } + + /* Update child busses */ + list_for_each_entry(cbus, &bus->children, node) + pnv_ioda_update_resources(cbus); +} + +static int __devinit pnv_ioda_alloc_pe(struct pnv_phb *phb) +{ + unsigned long pe; + + do { + pe = find_next_zero_bit(phb->ioda.pe_alloc, + phb->ioda.total_pe, 0); + if (pe >= phb->ioda.total_pe) + return IODA_INVALID_PE; + } while(test_and_set_bit(pe, phb->ioda.pe_alloc)); + + phb->ioda.pe_array[pe].pe_number = pe; + return pe; +} + +static void __devinit pnv_ioda_free_pe(struct pnv_phb *phb, int pe) +{ + WARN_ON(phb->ioda.pe_array[pe].pdev); + + memset(&phb->ioda.pe_array[pe], 0, sizeof(struct pnv_ioda_pe)); + clear_bit(pe, phb->ioda.pe_alloc); +} + +/* Currently those 2 are only used when MSIs are enabled, this will change + * but in the meantime, we need to protect them to avoid warnings + */ +#ifdef CONFIG_PCI_MSI +static struct pnv_ioda_pe * __devinit __pnv_ioda_get_one_pe(struct pci_dev *dev) +{ + struct pci_controller *hose = pci_bus_to_host(dev->bus); + struct pnv_phb *phb = hose->private_data; + struct pci_dn *pdn = pnv_ioda_get_pdn(dev); + + if (!pdn) + return NULL; + if (pdn->pe_number == IODA_INVALID_PE) + return NULL; + return &phb->ioda.pe_array[pdn->pe_number]; +} + +static struct pnv_ioda_pe * __devinit pnv_ioda_get_pe(struct pci_dev *dev) +{ + struct pnv_ioda_pe *pe = __pnv_ioda_get_one_pe(dev); + + while (!pe && dev->bus->self) { + dev = dev->bus->self; + pe = __pnv_ioda_get_one_pe(dev); + if (pe) + pe = pe->bus_pe; + } + return pe; +} +#endif /* CONFIG_PCI_MSI */ + +static int __devinit pnv_ioda_configure_pe(struct pnv_phb *phb, + struct pnv_ioda_pe *pe) +{ + struct pci_dev *parent; + uint8_t bcomp, dcomp, fcomp; + long rc, rid_end, rid; + + /* Bus validation ? */ + if (pe->pbus) { + int count; + + dcomp = OPAL_IGNORE_RID_DEVICE_NUMBER; + fcomp = OPAL_IGNORE_RID_FUNCTION_NUMBER; + parent = pe->pbus->self; + count = pe->pbus->subordinate - pe->pbus->secondary + 1; + switch(count) { + case 1: bcomp = OpalPciBusAll; break; + case 2: bcomp = OpalPciBus7Bits; break; + case 4: bcomp = OpalPciBus6Bits; break; + case 8: bcomp = OpalPciBus5Bits; break; + case 16: bcomp = OpalPciBus4Bits; break; + case 32: bcomp = OpalPciBus3Bits; break; + default: + pr_err("%s: Number of subordinate busses %d" + " unsupported\n", + pci_name(pe->pbus->self), count); + /* Do an exact match only */ + bcomp = OpalPciBusAll; + } + rid_end = pe->rid + (count << 8); + } else { + parent = pe->pdev->bus->self; + bcomp = OpalPciBusAll; + dcomp = OPAL_COMPARE_RID_DEVICE_NUMBER; + fcomp = OPAL_COMPARE_RID_FUNCTION_NUMBER; + rid_end = pe->rid + 1; + } + + /* Associate PE in PELT */ + rc = opal_pci_set_pe(phb->opal_id, pe->pe_number, pe->rid, + bcomp, dcomp, fcomp, OPAL_MAP_PE); + if (rc) { + pe_err(pe, "OPAL error %ld trying to setup PELT table\n", rc); + return -ENXIO; + } + opal_pci_eeh_freeze_clear(phb->opal_id, pe->pe_number, + OPAL_EEH_ACTION_CLEAR_FREEZE_ALL); + + /* Add to all parents PELT-V */ + while (parent) { + struct pci_dn *pdn = pnv_ioda_get_pdn(parent); + if (pdn && pdn->pe_number != IODA_INVALID_PE) { + rc = opal_pci_set_peltv(phb->opal_id, pdn->pe_number, + pe->pe_number, OPAL_ADD_PE_TO_DOMAIN); + /* XXX What to do in case of error ? */ + } + parent = parent->bus->self; + } + /* Setup reverse map */ + for (rid = pe->rid; rid < rid_end; rid++) + phb->ioda.pe_rmap[rid] = pe->pe_number; + + /* Setup one MVTs on IODA1 */ + if (phb->type == PNV_PHB_IODA1) { + pe->mve_number = pe->pe_number; + rc = opal_pci_set_mve(phb->opal_id, pe->mve_number, + pe->pe_number); + if (rc) { + pe_err(pe, "OPAL error %ld setting up MVE %d\n", + rc, pe->mve_number); + pe->mve_number = -1; + } else { + rc = opal_pci_set_mve_enable(phb->opal_id, + pe->mve_number, OPAL_ENABLE_MVE); + if (rc) { + pe_err(pe, "OPAL error %ld enabling MVE %d\n", + rc, pe->mve_number); + pe->mve_number = -1; + } + } + } else if (phb->type == PNV_PHB_IODA2) + pe->mve_number = 0; + + return 0; +} + +static void __devinit pnv_ioda_link_pe_by_weight(struct pnv_phb *phb, + struct pnv_ioda_pe *pe) +{ + struct pnv_ioda_pe *lpe; + + list_for_each_entry(lpe, &phb->ioda.pe_list, link) { + if (lpe->dma_weight < pe->dma_weight) { + list_add_tail(&pe->link, &lpe->link); + return; + } + } + list_add_tail(&pe->link, &phb->ioda.pe_list); +} + +static unsigned int pnv_ioda_dma_weight(struct pci_dev *dev) +{ + /* This is quite simplistic. The "base" weight of a device + * is 10. 0 means no DMA is to be accounted for it. + */ + + /* If it's a bridge, no DMA */ + if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) + return 0; + + /* Reduce the weight of slow USB controllers */ + if (dev->class == PCI_CLASS_SERIAL_USB_UHCI || + dev->class == PCI_CLASS_SERIAL_USB_OHCI || + dev->class == PCI_CLASS_SERIAL_USB_EHCI) + return 3; + + /* Increase the weight of RAID (includes Obsidian) */ + if ((dev->class >> 8) == PCI_CLASS_STORAGE_RAID) + return 15; + + /* Default */ + return 10; +} + +static struct pnv_ioda_pe * __devinit pnv_ioda_setup_dev_PE(struct pci_dev *dev) +{ + struct pci_controller *hose = pci_bus_to_host(dev->bus); + struct pnv_phb *phb = hose->private_data; + struct pci_dn *pdn = pnv_ioda_get_pdn(dev); + struct pnv_ioda_pe *pe; + int pe_num; + + if (!pdn) { + pr_err("%s: Device tree node not associated properly\n", + pci_name(dev)); + return NULL; + } + if (pdn->pe_number != IODA_INVALID_PE) + return NULL; + + /* PE#0 has been pre-set */ + if (dev->bus->number == 0) + pe_num = 0; + else + pe_num = pnv_ioda_alloc_pe(phb); + if (pe_num == IODA_INVALID_PE) { + pr_warning("%s: Not enough PE# available, disabling device\n", + pci_name(dev)); + return NULL; + } + + /* NOTE: We get only one ref to the pci_dev for the pdn, not for the + * pointer in the PE data structure, both should be destroyed at the + * same time. However, this needs to be looked at more closely again + * once we actually start removing things (Hotplug, SR-IOV, ...) + * + * At some point we want to remove the PDN completely anyways + */ + pe = &phb->ioda.pe_array[pe_num]; + pci_dev_get(dev); + pdn->pcidev = dev; + pdn->pe_number = pe_num; + pe->pdev = dev; + pe->pbus = NULL; + pe->tce32_seg = -1; + pe->mve_number = -1; + pe->rid = dev->bus->number << 8 | pdn->devfn; + + pe_info(pe, "Associated device to PE\n"); + + if (pnv_ioda_configure_pe(phb, pe)) { + /* XXX What do we do here ? */ + if (pe_num) + pnv_ioda_free_pe(phb, pe_num); + pdn->pe_number = IODA_INVALID_PE; + pe->pdev = NULL; + pci_dev_put(dev); + return NULL; + } + + /* Assign a DMA weight to the device */ + pe->dma_weight = pnv_ioda_dma_weight(dev); + if (pe->dma_weight != 0) { + phb->ioda.dma_weight += pe->dma_weight; + phb->ioda.dma_pe_count++; + } + + /* Link the PE */ + pnv_ioda_link_pe_by_weight(phb, pe); + + return pe; +} + +static void pnv_ioda_setup_same_PE(struct pci_bus *bus, struct pnv_ioda_pe *pe) +{ + struct pci_dev *dev; + + list_for_each_entry(dev, &bus->devices, bus_list) { + struct pci_dn *pdn = pnv_ioda_get_pdn(dev); + + if (pdn == NULL) { + pr_warn("%s: No device node associated with device !\n", + pci_name(dev)); + continue; + } + pci_dev_get(dev); + pdn->pcidev = dev; + pdn->pe_number = pe->pe_number; + pe->dma_weight += pnv_ioda_dma_weight(dev); + if (dev->subordinate) + pnv_ioda_setup_same_PE(dev->subordinate, pe); + } +} + +static void __devinit pnv_ioda_setup_bus_PE(struct pci_dev *dev, + struct pnv_ioda_pe *ppe) +{ + struct pci_controller *hose = pci_bus_to_host(dev->bus); + struct pnv_phb *phb = hose->private_data; + struct pci_bus *bus = dev->subordinate; + struct pnv_ioda_pe *pe; + int pe_num; + + if (!bus) { + pr_warning("%s: Bridge without a subordinate bus !\n", + pci_name(dev)); + return; + } + pe_num = pnv_ioda_alloc_pe(phb); + if (pe_num == IODA_INVALID_PE) { + pr_warning("%s: Not enough PE# available, disabling bus\n", + pci_name(dev)); + return; + } + + pe = &phb->ioda.pe_array[pe_num]; + ppe->bus_pe = pe; + pe->pbus = bus; + pe->pdev = NULL; + pe->tce32_seg = -1; + pe->mve_number = -1; + pe->rid = bus->secondary << 8; + pe->dma_weight = 0; + + pe_info(pe, "Secondary busses %d..%d associated with PE\n", + bus->secondary, bus->subordinate); + + if (pnv_ioda_configure_pe(phb, pe)) { + /* XXX What do we do here ? */ + if (pe_num) + pnv_ioda_free_pe(phb, pe_num); + pe->pbus = NULL; + return; + } + + /* Associate it with all child devices */ + pnv_ioda_setup_same_PE(bus, pe); + + /* Account for one DMA PE if at least one DMA capable device exist + * below the bridge + */ + if (pe->dma_weight != 0) { + phb->ioda.dma_weight += pe->dma_weight; + phb->ioda.dma_pe_count++; + } + + /* Link the PE */ + pnv_ioda_link_pe_by_weight(phb, pe); +} + +static void __devinit pnv_ioda_setup_PEs(struct pci_bus *bus) +{ + struct pci_dev *dev; + struct pnv_ioda_pe *pe; + + list_for_each_entry(dev, &bus->devices, bus_list) { + pe = pnv_ioda_setup_dev_PE(dev); + if (pe == NULL) + continue; + /* Leaving the PCIe domain ... single PE# */ + if (dev->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE) + pnv_ioda_setup_bus_PE(dev, pe); + else if (dev->subordinate) + pnv_ioda_setup_PEs(dev->subordinate); + } +} + +static void __devinit pnv_pci_ioda_dma_dev_setup(struct pnv_phb *phb, + struct pci_dev *dev) +{ + /* We delay DMA setup after we have assigned all PE# */ +} + +static void __devinit pnv_ioda_setup_bus_dma(struct pnv_ioda_pe *pe, + struct pci_bus *bus) +{ + struct pci_dev *dev; + + list_for_each_entry(dev, &bus->devices, bus_list) { + set_iommu_table_base(&dev->dev, &pe->tce32_table); + if (dev->subordinate) + pnv_ioda_setup_bus_dma(pe, dev->subordinate); + } +} + +static void __devinit pnv_pci_ioda_setup_dma_pe(struct pnv_phb *phb, + struct pnv_ioda_pe *pe, + unsigned int base, + unsigned int segs) +{ + + struct page *tce_mem = NULL; + const __be64 *swinvp; + struct iommu_table *tbl; + unsigned int i; + int64_t rc; + void *addr; + + /* 256M DMA window, 4K TCE pages, 8 bytes TCE */ +#define TCE32_TABLE_SIZE ((0x10000000 / 0x1000) * 8) + + /* XXX FIXME: Handle 64-bit only DMA devices */ + /* XXX FIXME: Provide 64-bit DMA facilities & non-4K TCE tables etc.. */ + /* XXX FIXME: Allocate multi-level tables on PHB3 */ + + /* We shouldn't already have a 32-bit DMA associated */ + if (WARN_ON(pe->tce32_seg >= 0)) + return; + + /* Grab a 32-bit TCE table */ + pe->tce32_seg = base; + pe_info(pe, " Setting up 32-bit TCE table at %08x..%08x\n", + (base << 28), ((base + segs) << 28) - 1); + + /* XXX Currently, we allocate one big contiguous table for the + * TCEs. We only really need one chunk per 256M of TCE space + * (ie per segment) but that's an optimization for later, it + * requires some added smarts with our get/put_tce implementation + */ + tce_mem = alloc_pages_node(phb->hose->node, GFP_KERNEL, + get_order(TCE32_TABLE_SIZE * segs)); + if (!tce_mem) { + pe_err(pe, " Failed to allocate a 32-bit TCE memory\n"); + goto fail; + } + addr = page_address(tce_mem); + memset(addr, 0, TCE32_TABLE_SIZE * segs); + + /* Configure HW */ + for (i = 0; i < segs; i++) { + rc = opal_pci_map_pe_dma_window(phb->opal_id, + pe->pe_number, + base + i, 1, + __pa(addr) + TCE32_TABLE_SIZE * i, + TCE32_TABLE_SIZE, 0x1000); + if (rc) { + pe_err(pe, " Failed to configure 32-bit TCE table," + " err %ld\n", rc); + goto fail; + } + } + + /* Setup linux iommu table */ + tbl = &pe->tce32_table; + pnv_pci_setup_iommu_table(tbl, addr, TCE32_TABLE_SIZE * segs, + base << 28); + + /* OPAL variant of P7IOC SW invalidated TCEs */ + swinvp = of_get_property(phb->hose->dn, "ibm,opal-tce-kill", NULL); + if (swinvp) { + /* We need a couple more fields -- an address and a data + * to or. Since the bus is only printed out on table free + * errors, and on the first pass the data will be a relative + * bus number, print that out instead. + */ + tbl->it_busno = 0; + tbl->it_index = (unsigned long)ioremap(be64_to_cpup(swinvp), 8); + tbl->it_type = TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE + | TCE_PCI_SWINV_PAIR; + } + iommu_init_table(tbl, phb->hose->node); + + if (pe->pdev) + set_iommu_table_base(&pe->pdev->dev, tbl); + else + pnv_ioda_setup_bus_dma(pe, pe->pbus); + + return; + fail: + /* XXX Failure: Try to fallback to 64-bit only ? */ + if (pe->tce32_seg >= 0) + pe->tce32_seg = -1; + if (tce_mem) + __free_pages(tce_mem, get_order(TCE32_TABLE_SIZE * segs)); +} + +static void __devinit pnv_ioda_setup_dma(struct pnv_phb *phb) +{ + struct pci_controller *hose = phb->hose; + unsigned int residual, remaining, segs, tw, base; + struct pnv_ioda_pe *pe; + + /* If we have more PE# than segments available, hand out one + * per PE until we run out and let the rest fail. If not, + * then we assign at least one segment per PE, plus more based + * on the amount of devices under that PE + */ + if (phb->ioda.dma_pe_count > phb->ioda.tce32_count) + residual = 0; + else + residual = phb->ioda.tce32_count - + phb->ioda.dma_pe_count; + + pr_info("PCI: Domain %04x has %ld available 32-bit DMA segments\n", + hose->global_number, phb->ioda.tce32_count); + pr_info("PCI: %d PE# for a total weight of %d\n", + phb->ioda.dma_pe_count, phb->ioda.dma_weight); + + /* Walk our PE list and configure their DMA segments, hand them + * out one base segment plus any residual segments based on + * weight + */ + remaining = phb->ioda.tce32_count; + tw = phb->ioda.dma_weight; + base = 0; + list_for_each_entry(pe, &phb->ioda.pe_list, link) { + if (!pe->dma_weight) + continue; + if (!remaining) { + pe_warn(pe, "No DMA32 resources available\n"); + continue; + } + segs = 1; + if (residual) { + segs += ((pe->dma_weight * residual) + (tw / 2)) / tw; + if (segs > remaining) + segs = remaining; + } + pe_info(pe, "DMA weight %d, assigned %d DMA32 segments\n", + pe->dma_weight, segs); + pnv_pci_ioda_setup_dma_pe(phb, pe, base, segs); + remaining -= segs; + base += segs; + } +} + +#ifdef CONFIG_PCI_MSI +static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev, + unsigned int hwirq, unsigned int is_64, + struct msi_msg *msg) +{ + struct pnv_ioda_pe *pe = pnv_ioda_get_pe(dev); + unsigned int xive_num = hwirq - phb->msi_base; + uint64_t addr64; + uint32_t addr32, data; + int rc; + + /* No PE assigned ? bail out ... no MSI for you ! */ + if (pe == NULL) + return -ENXIO; + + /* Check if we have an MVE */ + if (pe->mve_number < 0) + return -ENXIO; + + /* Assign XIVE to PE */ + rc = opal_pci_set_xive_pe(phb->opal_id, pe->pe_number, xive_num); + if (rc) { + pr_warn("%s: OPAL error %d setting XIVE %d PE\n", + pci_name(dev), rc, xive_num); + return -EIO; + } + + if (is_64) { + rc = opal_get_msi_64(phb->opal_id, pe->mve_number, xive_num, 1, + &addr64, &data); + if (rc) { + pr_warn("%s: OPAL error %d getting 64-bit MSI data\n", + pci_name(dev), rc); + return -EIO; + } + msg->address_hi = addr64 >> 32; + msg->address_lo = addr64 & 0xfffffffful; + } else { + rc = opal_get_msi_32(phb->opal_id, pe->mve_number, xive_num, 1, + &addr32, &data); + if (rc) { + pr_warn("%s: OPAL error %d getting 32-bit MSI data\n", + pci_name(dev), rc); + return -EIO; + } + msg->address_hi = 0; + msg->address_lo = addr32; + } + msg->data = data; + + pr_devel("%s: %s-bit MSI on hwirq %x (xive #%d)," + " address=%x_%08x data=%x PE# %d\n", + pci_name(dev), is_64 ? "64" : "32", hwirq, xive_num, + msg->address_hi, msg->address_lo, data, pe->pe_number); + + return 0; +} + +static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) +{ + unsigned int bmap_size; + const __be32 *prop = of_get_property(phb->hose->dn, + "ibm,opal-msi-ranges", NULL); + if (!prop) { + /* BML Fallback */ + prop = of_get_property(phb->hose->dn, "msi-ranges", NULL); + } + if (!prop) + return; + + phb->msi_base = be32_to_cpup(prop); + phb->msi_count = be32_to_cpup(prop + 1); + bmap_size = BITS_TO_LONGS(phb->msi_count) * sizeof(unsigned long); + phb->msi_map = zalloc_maybe_bootmem(bmap_size, GFP_KERNEL); + if (!phb->msi_map) { + pr_err("PCI %d: Failed to allocate MSI bitmap !\n", + phb->hose->global_number); + return; + } + phb->msi_setup = pnv_pci_ioda_msi_setup; + phb->msi32_support = 1; + pr_info(" Allocated bitmap for %d MSIs (base IRQ 0x%x)\n", + phb->msi_count, phb->msi_base); +} +#else +static void pnv_pci_init_ioda_msis(struct pnv_phb *phb) { } +#endif /* CONFIG_PCI_MSI */ + +/* This is the starting point of our IODA specific resource + * allocation process + */ +static void __devinit pnv_pci_ioda_fixup_phb(struct pci_controller *hose) +{ + resource_size_t size, align; + struct pci_bus *child; + + /* Associate PEs per functions */ + pnv_ioda_setup_PEs(hose->bus); + + /* Calculate all resources */ + pnv_ioda_calc_bus(hose->bus, IORESOURCE_IO, &size, &align); + pnv_ioda_calc_bus(hose->bus, IORESOURCE_MEM, &size, &align); + + /* Apply then to HW */ + pnv_ioda_update_resources(hose->bus); + + /* Setup DMA */ + pnv_ioda_setup_dma(hose->private_data); + + /* Configure PCI Express settings */ + list_for_each_entry(child, &hose->bus->children, node) { + struct pci_dev *self = child->self; + if (!self) + continue; + pcie_bus_configure_settings(child, self->pcie_mpss); + } +} + +/* Prevent enabling devices for which we couldn't properly + * assign a PE + */ +static int __devinit pnv_pci_enable_device_hook(struct pci_dev *dev) +{ + struct pci_dn *pdn = pnv_ioda_get_pdn(dev); + + if (!pdn || pdn->pe_number == IODA_INVALID_PE) + return -EINVAL; + return 0; +} + +static u32 pnv_ioda_bdfn_to_pe(struct pnv_phb *phb, struct pci_bus *bus, + u32 devfn) +{ + return phb->ioda.pe_rmap[(bus->number << 8) | devfn]; +} + +void __init pnv_pci_init_ioda1_phb(struct device_node *np) +{ + struct pci_controller *hose; + static int primary = 1; + struct pnv_phb *phb; + unsigned long size, m32map_off, iomap_off, pemap_off; + const u64 *prop64; + u64 phb_id; + void *aux; + long rc; + + pr_info(" Initializing IODA OPAL PHB %s\n", np->full_name); + + prop64 = of_get_property(np, "ibm,opal-phbid", NULL); + if (!prop64) { + pr_err(" Missing \"ibm,opal-phbid\" property !\n"); + return; + } + phb_id = be64_to_cpup(prop64); + pr_debug(" PHB-ID : 0x%016llx\n", phb_id); + + phb = alloc_bootmem(sizeof(struct pnv_phb)); + if (phb) { + memset(phb, 0, sizeof(struct pnv_phb)); + phb->hose = hose = pcibios_alloc_controller(np); + } + if (!phb || !phb->hose) { + pr_err("PCI: Failed to allocate PCI controller for %s\n", + np->full_name); + return; + } + + spin_lock_init(&phb->lock); + /* XXX Use device-tree */ + hose->first_busno = 0; + hose->last_busno = 0xff; + hose->private_data = phb; + phb->opal_id = phb_id; + phb->type = PNV_PHB_IODA1; + + /* Detect specific models for error handling */ + if (of_device_is_compatible(np, "ibm,p7ioc-pciex")) + phb->model = PNV_PHB_MODEL_P7IOC; + else + phb->model = PNV_PHB_MODEL_UNKNOWN; + + /* We parse "ranges" now since we need to deduce the register base + * from the IO base + */ + pci_process_bridge_OF_ranges(phb->hose, np, primary); + primary = 0; + + /* Magic formula from Milton */ + phb->regs = of_iomap(np, 0); + if (phb->regs == NULL) + pr_err(" Failed to map registers !\n"); + + + /* XXX This is hack-a-thon. This needs to be changed so that: + * - we obtain stuff like PE# etc... from device-tree + * - we properly re-allocate M32 ourselves + * (the OFW one isn't very good) + */ + + /* Initialize more IODA stuff */ + phb->ioda.total_pe = 128; + + phb->ioda.m32_size = resource_size(&hose->mem_resources[0]); + /* OFW Has already off top 64k of M32 space (MSI space) */ + phb->ioda.m32_size += 0x10000; + + phb->ioda.m32_segsize = phb->ioda.m32_size / phb->ioda.total_pe; + phb->ioda.m32_pci_base = hose->mem_resources[0].start - + hose->pci_mem_offset; + phb->ioda.io_size = hose->pci_io_size; + phb->ioda.io_segsize = phb->ioda.io_size / phb->ioda.total_pe; + phb->ioda.io_pci_base = 0; /* XXX calculate this ? */ + + /* Allocate aux data & arrays */ + size = _ALIGN_UP(phb->ioda.total_pe / 8, sizeof(unsigned long)); + m32map_off = size; + size += phb->ioda.total_pe; + iomap_off = size; + size += phb->ioda.total_pe; + pemap_off = size; + size += phb->ioda.total_pe * sizeof(struct pnv_ioda_pe); + aux = alloc_bootmem(size); + memset(aux, 0, size); + phb->ioda.pe_alloc = aux; + phb->ioda.m32_segmap = aux + m32map_off; + phb->ioda.io_segmap = aux + iomap_off; + phb->ioda.pe_array = aux + pemap_off; + set_bit(0, phb->ioda.pe_alloc); + + INIT_LIST_HEAD(&phb->ioda.pe_list); + + /* Calculate how many 32-bit TCE segments we have */ + phb->ioda.tce32_count = phb->ioda.m32_pci_base >> 28; + + /* Clear unusable m64 */ + hose->mem_resources[1].flags = 0; + hose->mem_resources[1].start = 0; + hose->mem_resources[1].end = 0; + hose->mem_resources[2].flags = 0; + hose->mem_resources[2].start = 0; + hose->mem_resources[2].end = 0; + +#if 0 + rc = opal_pci_set_phb_mem_window(opal->phb_id, + window_type, + window_num, + starting_real_address, + starting_pci_address, + segment_size); +#endif + + pr_info(" %d PE's M32: 0x%x [segment=0x%x] IO: 0x%x [segment=0x%x]\n", + phb->ioda.total_pe, + phb->ioda.m32_size, phb->ioda.m32_segsize, + phb->ioda.io_size, phb->ioda.io_segsize); + + if (phb->regs) { + pr_devel(" BUID = 0x%016llx\n", in_be64(phb->regs + 0x100)); + pr_devel(" PHB2_CR = 0x%016llx\n", in_be64(phb->regs + 0x160)); + pr_devel(" IO_BAR = 0x%016llx\n", in_be64(phb->regs + 0x170)); + pr_devel(" IO_BAMR = 0x%016llx\n", in_be64(phb->regs + 0x178)); + pr_devel(" IO_SAR = 0x%016llx\n", in_be64(phb->regs + 0x180)); + pr_devel(" M32_BAR = 0x%016llx\n", in_be64(phb->regs + 0x190)); + pr_devel(" M32_BAMR = 0x%016llx\n", in_be64(phb->regs + 0x198)); + pr_devel(" M32_SAR = 0x%016llx\n", in_be64(phb->regs + 0x1a0)); + } + phb->hose->ops = &pnv_pci_ops; + + /* Setup RID -> PE mapping function */ + phb->bdfn_to_pe = pnv_ioda_bdfn_to_pe; + + /* Setup TCEs */ + phb->dma_dev_setup = pnv_pci_ioda_dma_dev_setup; + + /* Setup MSI support */ + pnv_pci_init_ioda_msis(phb); + + /* We set both probe_only and PCI_REASSIGN_ALL_RSRC. This is an + * odd combination which essentially means that we skip all resource + * fixups and assignments in the generic code, and do it all + * ourselves here + */ + pci_probe_only = 1; + ppc_md.pcibios_fixup_phb = pnv_pci_ioda_fixup_phb; + ppc_md.pcibios_enable_device_hook = pnv_pci_enable_device_hook; + pci_add_flags(PCI_REASSIGN_ALL_RSRC); + + /* Reset IODA tables to a clean state */ + rc = opal_pci_reset(phb_id, OPAL_PCI_IODA_TABLE_RESET, OPAL_ASSERT_RESET); + if (rc) + pr_warning(" OPAL Error %ld performing IODA table reset !\n", rc); + opal_pci_set_pe(phb_id, 0, 0, 7, 1, 1 , OPAL_MAP_PE); +} + +void __init pnv_pci_init_ioda_hub(struct device_node *np) +{ + struct device_node *phbn; + const u64 *prop64; + u64 hub_id; + + pr_info("Probing IODA IO-Hub %s\n", np->full_name); + + prop64 = of_get_property(np, "ibm,opal-hubid", NULL); + if (!prop64) { + pr_err(" Missing \"ibm,opal-hubid\" property !\n"); + return; + } + hub_id = be64_to_cpup(prop64); + pr_devel(" HUB-ID : 0x%016llx\n", hub_id); + + /* Count child PHBs */ + for_each_child_of_node(np, phbn) { + /* Look for IODA1 PHBs */ + if (of_device_is_compatible(phbn, "ibm,ioda-phb")) + pnv_pci_init_ioda1_phb(phbn); + } +} |