diff options
Diffstat (limited to 'arch/sparc/kernel/pci_sun4v.c')
| -rw-r--r-- | arch/sparc/kernel/pci_sun4v.c | 1033 |
1 files changed, 1033 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c new file mode 100644 index 00000000000..34a1fded394 --- /dev/null +++ b/arch/sparc/kernel/pci_sun4v.c @@ -0,0 +1,1033 @@ +/* pci_sun4v.c: SUN4V specific PCI controller support. + * + * Copyright (C) 2006, 2007, 2008 David S. Miller (davem@davemloft.net) + */ + +#include <linux/kernel.h> +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/percpu.h> +#include <linux/irq.h> +#include <linux/msi.h> +#include <linux/log2.h> +#include <linux/of_device.h> + +#include <asm/iommu.h> +#include <asm/irq.h> +#include <asm/hypervisor.h> +#include <asm/prom.h> + +#include "pci_impl.h" +#include "iommu_common.h" + +#include "pci_sun4v.h" + +#define DRIVER_NAME "pci_sun4v" +#define PFX DRIVER_NAME ": " + +static unsigned long vpci_major = 1; +static unsigned long vpci_minor = 1; + +#define PGLIST_NENTS (PAGE_SIZE / sizeof(u64)) + +struct iommu_batch { + struct device *dev; /* Device mapping is for. */ + unsigned long prot; /* IOMMU page protections */ + unsigned long entry; /* Index into IOTSB. */ + u64 *pglist; /* List of physical pages */ + unsigned long npages; /* Number of pages in list. */ +}; + +static DEFINE_PER_CPU(struct iommu_batch, iommu_batch); +static int iommu_batch_initialized; + +/* Interrupts must be disabled. */ +static inline void iommu_batch_start(struct device *dev, unsigned long prot, unsigned long entry) +{ + struct iommu_batch *p = &__get_cpu_var(iommu_batch); + + p->dev = dev; + p->prot = prot; + p->entry = entry; + p->npages = 0; +} + +/* Interrupts must be disabled. */ +static long iommu_batch_flush(struct iommu_batch *p) +{ + struct pci_pbm_info *pbm = p->dev->archdata.host_controller; + unsigned long devhandle = pbm->devhandle; + unsigned long prot = p->prot; + unsigned long entry = p->entry; + u64 *pglist = p->pglist; + unsigned long npages = p->npages; + + while (npages != 0) { + long num; + + num = pci_sun4v_iommu_map(devhandle, HV_PCI_TSBID(0, entry), + npages, prot, __pa(pglist)); + if (unlikely(num < 0)) { + if (printk_ratelimit()) + printk("iommu_batch_flush: IOMMU map of " + "[%08lx:%08lx:%lx:%lx:%lx] failed with " + "status %ld\n", + devhandle, HV_PCI_TSBID(0, entry), + npages, prot, __pa(pglist), num); + return -1; + } + + entry += num; + npages -= num; + pglist += num; + } + + p->entry = entry; + p->npages = 0; + + return 0; +} + +static inline void iommu_batch_new_entry(unsigned long entry) +{ + struct iommu_batch *p = &__get_cpu_var(iommu_batch); + + if (p->entry + p->npages == entry) + return; + if (p->entry != ~0UL) + iommu_batch_flush(p); + p->entry = entry; +} + +/* Interrupts must be disabled. */ +static inline long iommu_batch_add(u64 phys_page) +{ + struct iommu_batch *p = &__get_cpu_var(iommu_batch); + + BUG_ON(p->npages >= PGLIST_NENTS); + + p->pglist[p->npages++] = phys_page; + if (p->npages == PGLIST_NENTS) + return iommu_batch_flush(p); + + return 0; +} + +/* Interrupts must be disabled. */ +static inline long iommu_batch_end(void) +{ + struct iommu_batch *p = &__get_cpu_var(iommu_batch); + + BUG_ON(p->npages >= PGLIST_NENTS); + + return iommu_batch_flush(p); +} + +static void *dma_4v_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_addrp, gfp_t gfp) +{ + unsigned long flags, order, first_page, npages, n; + struct iommu *iommu; + struct page *page; + void *ret; + long entry; + int nid; + + size = IO_PAGE_ALIGN(size); + order = get_order(size); + if (unlikely(order >= MAX_ORDER)) + return NULL; + + npages = size >> IO_PAGE_SHIFT; + + nid = dev->archdata.numa_node; + page = alloc_pages_node(nid, gfp, order); + if (unlikely(!page)) + return NULL; + + first_page = (unsigned long) page_address(page); + memset((char *)first_page, 0, PAGE_SIZE << order); + + iommu = dev->archdata.iommu; + + spin_lock_irqsave(&iommu->lock, flags); + entry = iommu_range_alloc(dev, iommu, npages, NULL); + spin_unlock_irqrestore(&iommu->lock, flags); + + if (unlikely(entry == DMA_ERROR_CODE)) + goto range_alloc_fail; + + *dma_addrp = (iommu->page_table_map_base + + (entry << IO_PAGE_SHIFT)); + ret = (void *) first_page; + first_page = __pa(first_page); + + local_irq_save(flags); + + iommu_batch_start(dev, + (HV_PCI_MAP_ATTR_READ | + HV_PCI_MAP_ATTR_WRITE), + entry); + + for (n = 0; n < npages; n++) { + long err = iommu_batch_add(first_page + (n * PAGE_SIZE)); + if (unlikely(err < 0L)) + goto iommu_map_fail; + } + + if (unlikely(iommu_batch_end() < 0L)) + goto iommu_map_fail; + + local_irq_restore(flags); + + return ret; + +iommu_map_fail: + /* Interrupts are disabled. */ + spin_lock(&iommu->lock); + iommu_range_free(iommu, *dma_addrp, npages); + spin_unlock_irqrestore(&iommu->lock, flags); + +range_alloc_fail: + free_pages(first_page, order); + return NULL; +} + +static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu, + dma_addr_t dvma) +{ + struct pci_pbm_info *pbm; + struct iommu *iommu; + unsigned long flags, order, npages, entry; + u32 devhandle; + + npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT; + iommu = dev->archdata.iommu; + pbm = dev->archdata.host_controller; + devhandle = pbm->devhandle; + entry = ((dvma - iommu->page_table_map_base) >> IO_PAGE_SHIFT); + + spin_lock_irqsave(&iommu->lock, flags); + + iommu_range_free(iommu, dvma, npages); + + do { + unsigned long num; + + num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry), + npages); + entry += num; + npages -= num; + } while (npages != 0); + + spin_unlock_irqrestore(&iommu->lock, flags); + + order = get_order(size); + if (order < 10) + free_pages((unsigned long)cpu, order); +} + +static dma_addr_t dma_4v_map_single(struct device *dev, void *ptr, size_t sz, + enum dma_data_direction direction) +{ + struct iommu *iommu; + unsigned long flags, npages, oaddr; + unsigned long i, base_paddr; + u32 bus_addr, ret; + unsigned long prot; + long entry; + + iommu = dev->archdata.iommu; + + if (unlikely(direction == DMA_NONE)) + goto bad; + + oaddr = (unsigned long)ptr; + npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK); + npages >>= IO_PAGE_SHIFT; + + spin_lock_irqsave(&iommu->lock, flags); + entry = iommu_range_alloc(dev, iommu, npages, NULL); + spin_unlock_irqrestore(&iommu->lock, flags); + + if (unlikely(entry == DMA_ERROR_CODE)) + goto bad; + + bus_addr = (iommu->page_table_map_base + + (entry << IO_PAGE_SHIFT)); + ret = bus_addr | (oaddr & ~IO_PAGE_MASK); + base_paddr = __pa(oaddr & IO_PAGE_MASK); + prot = HV_PCI_MAP_ATTR_READ; + if (direction != DMA_TO_DEVICE) + prot |= HV_PCI_MAP_ATTR_WRITE; + + local_irq_save(flags); + + iommu_batch_start(dev, prot, entry); + + for (i = 0; i < npages; i++, base_paddr += IO_PAGE_SIZE) { + long err = iommu_batch_add(base_paddr); + if (unlikely(err < 0L)) + goto iommu_map_fail; + } + if (unlikely(iommu_batch_end() < 0L)) + goto iommu_map_fail; + + local_irq_restore(flags); + + return ret; + +bad: + if (printk_ratelimit()) + WARN_ON(1); + return DMA_ERROR_CODE; + +iommu_map_fail: + /* Interrupts are disabled. */ + spin_lock(&iommu->lock); + iommu_range_free(iommu, bus_addr, npages); + spin_unlock_irqrestore(&iommu->lock, flags); + + return DMA_ERROR_CODE; +} + +static void dma_4v_unmap_single(struct device *dev, dma_addr_t bus_addr, + size_t sz, enum dma_data_direction direction) +{ + struct pci_pbm_info *pbm; + struct iommu *iommu; + unsigned long flags, npages; + long entry; + u32 devhandle; + + if (unlikely(direction == DMA_NONE)) { + if (printk_ratelimit()) + WARN_ON(1); + return; + } + + iommu = dev->archdata.iommu; + pbm = dev->archdata.host_controller; + devhandle = pbm->devhandle; + + npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK); + npages >>= IO_PAGE_SHIFT; + bus_addr &= IO_PAGE_MASK; + + spin_lock_irqsave(&iommu->lock, flags); + + iommu_range_free(iommu, bus_addr, npages); + + entry = (bus_addr - iommu->page_table_map_base) >> IO_PAGE_SHIFT; + do { + unsigned long num; + + num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry), + npages); + entry += num; + npages -= num; + } while (npages != 0); + + spin_unlock_irqrestore(&iommu->lock, flags); +} + +static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction) +{ + struct scatterlist *s, *outs, *segstart; + unsigned long flags, handle, prot; + dma_addr_t dma_next = 0, dma_addr; + unsigned int max_seg_size; + unsigned long seg_boundary_size; + int outcount, incount, i; + struct iommu *iommu; + unsigned long base_shift; + long err; + + BUG_ON(direction == DMA_NONE); + + iommu = dev->archdata.iommu; + if (nelems == 0 || !iommu) + return 0; + + prot = HV_PCI_MAP_ATTR_READ; + if (direction != DMA_TO_DEVICE) + prot |= HV_PCI_MAP_ATTR_WRITE; + + outs = s = segstart = &sglist[0]; + outcount = 1; + incount = nelems; + handle = 0; + + /* Init first segment length for backout at failure */ + outs->dma_length = 0; + + spin_lock_irqsave(&iommu->lock, flags); + + iommu_batch_start(dev, prot, ~0UL); + + max_seg_size = dma_get_max_seg_size(dev); + seg_boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1, + IO_PAGE_SIZE) >> IO_PAGE_SHIFT; + base_shift = iommu->page_table_map_base >> IO_PAGE_SHIFT; + for_each_sg(sglist, s, nelems, i) { + unsigned long paddr, npages, entry, out_entry = 0, slen; + + slen = s->length; + /* Sanity check */ + if (slen == 0) { + dma_next = 0; + continue; + } + /* Allocate iommu entries for that segment */ + paddr = (unsigned long) SG_ENT_PHYS_ADDRESS(s); + npages = iommu_num_pages(paddr, slen, IO_PAGE_SIZE); + entry = iommu_range_alloc(dev, iommu, npages, &handle); + + /* Handle failure */ + if (unlikely(entry == DMA_ERROR_CODE)) { + if (printk_ratelimit()) + printk(KERN_INFO "iommu_alloc failed, iommu %p paddr %lx" + " npages %lx\n", iommu, paddr, npages); + goto iommu_map_failed; + } + + iommu_batch_new_entry(entry); + + /* Convert entry to a dma_addr_t */ + dma_addr = iommu->page_table_map_base + + (entry << IO_PAGE_SHIFT); + dma_addr |= (s->offset & ~IO_PAGE_MASK); + + /* Insert into HW table */ + paddr &= IO_PAGE_MASK; + while (npages--) { + err = iommu_batch_add(paddr); + if (unlikely(err < 0L)) + goto iommu_map_failed; + paddr += IO_PAGE_SIZE; + } + + /* If we are in an open segment, try merging */ + if (segstart != s) { + /* We cannot merge if: + * - allocated dma_addr isn't contiguous to previous allocation + */ + if ((dma_addr != dma_next) || + (outs->dma_length + s->length > max_seg_size) || + (is_span_boundary(out_entry, base_shift, + seg_boundary_size, outs, s))) { + /* Can't merge: create a new segment */ + segstart = s; + outcount++; + outs = sg_next(outs); + } else { + outs->dma_length += s->length; + } + } + + if (segstart == s) { + /* This is a new segment, fill entries */ + outs->dma_address = dma_addr; + outs->dma_length = slen; + out_entry = entry; + } + + /* Calculate next page pointer for contiguous check */ + dma_next = dma_addr + slen; + } + + err = iommu_batch_end(); + + if (unlikely(err < 0L)) + goto iommu_map_failed; + + spin_unlock_irqrestore(&iommu->lock, flags); + + if (outcount < incount) { + outs = sg_next(outs); + outs->dma_address = DMA_ERROR_CODE; + outs->dma_length = 0; + } + + return outcount; + +iommu_map_failed: + for_each_sg(sglist, s, nelems, i) { + if (s->dma_length != 0) { + unsigned long vaddr, npages; + + vaddr = s->dma_address & IO_PAGE_MASK; + npages = iommu_num_pages(s->dma_address, s->dma_length, + IO_PAGE_SIZE); + iommu_range_free(iommu, vaddr, npages); + /* XXX demap? XXX */ + s->dma_address = DMA_ERROR_CODE; + s->dma_length = 0; + } + if (s == outs) + break; + } + spin_unlock_irqrestore(&iommu->lock, flags); + + return 0; +} + +static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction) +{ + struct pci_pbm_info *pbm; + struct scatterlist *sg; + struct iommu *iommu; + unsigned long flags; + u32 devhandle; + + BUG_ON(direction == DMA_NONE); + + iommu = dev->archdata.iommu; + pbm = dev->archdata.host_controller; + devhandle = pbm->devhandle; + + spin_lock_irqsave(&iommu->lock, flags); + + sg = sglist; + while (nelems--) { + dma_addr_t dma_handle = sg->dma_address; + unsigned int len = sg->dma_length; + unsigned long npages, entry; + + if (!len) + break; + npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE); + iommu_range_free(iommu, dma_handle, npages); + + entry = ((dma_handle - iommu->page_table_map_base) >> IO_PAGE_SHIFT); + while (npages) { + unsigned long num; + + num = pci_sun4v_iommu_demap(devhandle, HV_PCI_TSBID(0, entry), + npages); + entry += num; + npages -= num; + } + + sg = sg_next(sg); + } + + spin_unlock_irqrestore(&iommu->lock, flags); +} + +static void dma_4v_sync_single_for_cpu(struct device *dev, + dma_addr_t bus_addr, size_t sz, + enum dma_data_direction direction) +{ + /* Nothing to do... */ +} + +static void dma_4v_sync_sg_for_cpu(struct device *dev, + struct scatterlist *sglist, int nelems, + enum dma_data_direction direction) +{ + /* Nothing to do... */ +} + +static const struct dma_ops sun4v_dma_ops = { + .alloc_coherent = dma_4v_alloc_coherent, + .free_coherent = dma_4v_free_coherent, + .map_single = dma_4v_map_single, + .unmap_single = dma_4v_unmap_single, + .map_sg = dma_4v_map_sg, + .unmap_sg = dma_4v_unmap_sg, + .sync_single_for_cpu = dma_4v_sync_single_for_cpu, + .sync_sg_for_cpu = dma_4v_sync_sg_for_cpu, +}; + +static void __init pci_sun4v_scan_bus(struct pci_pbm_info *pbm, + struct device *parent) +{ + struct property *prop; + struct device_node *dp; + + dp = pbm->op->node; + prop = of_find_property(dp, "66mhz-capable", NULL); + pbm->is_66mhz_capable = (prop != NULL); + pbm->pci_bus = pci_scan_one_pbm(pbm, parent); + + /* XXX register error interrupt handlers XXX */ +} + +static unsigned long __init probe_existing_entries(struct pci_pbm_info *pbm, + struct iommu *iommu) +{ + struct iommu_arena *arena = &iommu->arena; + unsigned long i, cnt = 0; + u32 devhandle; + + devhandle = pbm->devhandle; + for (i = 0; i < arena->limit; i++) { + unsigned long ret, io_attrs, ra; + + ret = pci_sun4v_iommu_getmap(devhandle, + HV_PCI_TSBID(0, i), + &io_attrs, &ra); + if (ret == HV_EOK) { + if (page_in_phys_avail(ra)) { + pci_sun4v_iommu_demap(devhandle, + HV_PCI_TSBID(0, i), 1); + } else { + cnt++; + __set_bit(i, arena->map); + } + } + } + + return cnt; +} + +static int __init pci_sun4v_iommu_init(struct pci_pbm_info *pbm) +{ + static const u32 vdma_default[] = { 0x80000000, 0x80000000 }; + struct iommu *iommu = pbm->iommu; + unsigned long num_tsb_entries, sz, tsbsize; + u32 dma_mask, dma_offset; + const u32 *vdma; + + vdma = of_get_property(pbm->op->node, "virtual-dma", NULL); + if (!vdma) + vdma = vdma_default; + + if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) { + printk(KERN_ERR PFX "Strange virtual-dma[%08x:%08x].\n", + vdma[0], vdma[1]); + return -EINVAL; + }; + + dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL); + num_tsb_entries = vdma[1] / IO_PAGE_SIZE; + tsbsize = num_tsb_entries * sizeof(iopte_t); + + dma_offset = vdma[0]; + + /* Setup initial software IOMMU state. */ + spin_lock_init(&iommu->lock); + iommu->ctx_lowest_free = 1; + iommu->page_table_map_base = dma_offset; + iommu->dma_addr_mask = dma_mask; + + /* Allocate and initialize the free area map. */ + sz = (num_tsb_entries + 7) / 8; + sz = (sz + 7UL) & ~7UL; + iommu->arena.map = kzalloc(sz, GFP_KERNEL); + if (!iommu->arena.map) { + printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n"); + return -ENOMEM; + } + iommu->arena.limit = num_tsb_entries; + + sz = probe_existing_entries(pbm, iommu); + if (sz) + printk("%s: Imported %lu TSB entries from OBP\n", + pbm->name, sz); + + return 0; +} + +#ifdef CONFIG_PCI_MSI +struct pci_sun4v_msiq_entry { + u64 version_type; +#define MSIQ_VERSION_MASK 0xffffffff00000000UL +#define MSIQ_VERSION_SHIFT 32 +#define MSIQ_TYPE_MASK 0x00000000000000ffUL +#define MSIQ_TYPE_SHIFT 0 +#define MSIQ_TYPE_NONE 0x00 +#define MSIQ_TYPE_MSG 0x01 +#define MSIQ_TYPE_MSI32 0x02 +#define MSIQ_TYPE_MSI64 0x03 +#define MSIQ_TYPE_INTX 0x08 +#define MSIQ_TYPE_NONE2 0xff + + u64 intx_sysino; + u64 reserved1; + u64 stick; + u64 req_id; /* bus/device/func */ +#define MSIQ_REQID_BUS_MASK 0xff00UL +#define MSIQ_REQID_BUS_SHIFT 8 +#define MSIQ_REQID_DEVICE_MASK 0x00f8UL +#define MSIQ_REQID_DEVICE_SHIFT 3 +#define MSIQ_REQID_FUNC_MASK 0x0007UL +#define MSIQ_REQID_FUNC_SHIFT 0 + + u64 msi_address; + + /* The format of this value is message type dependent. + * For MSI bits 15:0 are the data from the MSI packet. + * For MSI-X bits 31:0 are the data from the MSI packet. + * For MSG, the message code and message routing code where: + * bits 39:32 is the bus/device/fn of the msg target-id + * bits 18:16 is the message routing code + * bits 7:0 is the message code + * For INTx the low order 2-bits are: + * 00 - INTA + * 01 - INTB + * 10 - INTC + * 11 - INTD + */ + u64 msi_data; + + u64 reserved2; +}; + +static int pci_sun4v_get_head(struct pci_pbm_info *pbm, unsigned long msiqid, + unsigned long *head) +{ + unsigned long err, limit; + + err = pci_sun4v_msiq_gethead(pbm->devhandle, msiqid, head); + if (unlikely(err)) + return -ENXIO; + + limit = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry); + if (unlikely(*head >= limit)) + return -EFBIG; + + return 0; +} + +static int pci_sun4v_dequeue_msi(struct pci_pbm_info *pbm, + unsigned long msiqid, unsigned long *head, + unsigned long *msi) +{ + struct pci_sun4v_msiq_entry *ep; + unsigned long err, type; + + /* Note: void pointer arithmetic, 'head' is a byte offset */ + ep = (pbm->msi_queues + ((msiqid - pbm->msiq_first) * + (pbm->msiq_ent_count * + sizeof(struct pci_sun4v_msiq_entry))) + + *head); + + if ((ep->version_type & MSIQ_TYPE_MASK) == 0) + return 0; + + type = (ep->version_type & MSIQ_TYPE_MASK) >> MSIQ_TYPE_SHIFT; + if (unlikely(type != MSIQ_TYPE_MSI32 && + type != MSIQ_TYPE_MSI64)) + return -EINVAL; + + *msi = ep->msi_data; + + err = pci_sun4v_msi_setstate(pbm->devhandle, + ep->msi_data /* msi_num */, + HV_MSISTATE_IDLE); + if (unlikely(err)) + return -ENXIO; + + /* Clear the entry. */ + ep->version_type &= ~MSIQ_TYPE_MASK; + + (*head) += sizeof(struct pci_sun4v_msiq_entry); + if (*head >= + (pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry))) + *head = 0; + + return 1; +} + +static int pci_sun4v_set_head(struct pci_pbm_info *pbm, unsigned long msiqid, + unsigned long head) +{ + unsigned long err; + + err = pci_sun4v_msiq_sethead(pbm->devhandle, msiqid, head); + if (unlikely(err)) + return -EINVAL; + + return 0; +} + +static int pci_sun4v_msi_setup(struct pci_pbm_info *pbm, unsigned long msiqid, + unsigned long msi, int is_msi64) +{ + if (pci_sun4v_msi_setmsiq(pbm->devhandle, msi, msiqid, + (is_msi64 ? + HV_MSITYPE_MSI64 : HV_MSITYPE_MSI32))) + return -ENXIO; + if (pci_sun4v_msi_setstate(pbm->devhandle, msi, HV_MSISTATE_IDLE)) + return -ENXIO; + if (pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_VALID)) + return -ENXIO; + return 0; +} + +static int pci_sun4v_msi_teardown(struct pci_pbm_info *pbm, unsigned long msi) +{ + unsigned long err, msiqid; + + err = pci_sun4v_msi_getmsiq(pbm->devhandle, msi, &msiqid); + if (err) + return -ENXIO; + + pci_sun4v_msi_setvalid(pbm->devhandle, msi, HV_MSIVALID_INVALID); + + return 0; +} + +static int pci_sun4v_msiq_alloc(struct pci_pbm_info *pbm) +{ + unsigned long q_size, alloc_size, pages, order; + int i; + + q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry); + alloc_size = (pbm->msiq_num * q_size); + order = get_order(alloc_size); + pages = __get_free_pages(GFP_KERNEL | __GFP_COMP, order); + if (pages == 0UL) { + printk(KERN_ERR "MSI: Cannot allocate MSI queues (o=%lu).\n", + order); + return -ENOMEM; + } + memset((char *)pages, 0, PAGE_SIZE << order); + pbm->msi_queues = (void *) pages; + + for (i = 0; i < pbm->msiq_num; i++) { + unsigned long err, base = __pa(pages + (i * q_size)); + unsigned long ret1, ret2; + + err = pci_sun4v_msiq_conf(pbm->devhandle, + pbm->msiq_first + i, + base, pbm->msiq_ent_count); + if (err) { + printk(KERN_ERR "MSI: msiq register fails (err=%lu)\n", + err); + goto h_error; + } + + err = pci_sun4v_msiq_info(pbm->devhandle, + pbm->msiq_first + i, + &ret1, &ret2); + if (err) { + printk(KERN_ERR "MSI: Cannot read msiq (err=%lu)\n", + err); + goto h_error; + } + if (ret1 != base || ret2 != pbm->msiq_ent_count) { + printk(KERN_ERR "MSI: Bogus qconf " + "expected[%lx:%x] got[%lx:%lx]\n", + base, pbm->msiq_ent_count, + ret1, ret2); + goto h_error; + } + } + + return 0; + +h_error: + free_pages(pages, order); + return -EINVAL; +} + +static void pci_sun4v_msiq_free(struct pci_pbm_info *pbm) +{ + unsigned long q_size, alloc_size, pages, order; + int i; + + for (i = 0; i < pbm->msiq_num; i++) { + unsigned long msiqid = pbm->msiq_first + i; + + (void) pci_sun4v_msiq_conf(pbm->devhandle, msiqid, 0UL, 0); + } + + q_size = pbm->msiq_ent_count * sizeof(struct pci_sun4v_msiq_entry); + alloc_size = (pbm->msiq_num * q_size); + order = get_order(alloc_size); + + pages = (unsigned long) pbm->msi_queues; + + free_pages(pages, order); + + pbm->msi_queues = NULL; +} + +static int pci_sun4v_msiq_build_irq(struct pci_pbm_info *pbm, + unsigned long msiqid, + unsigned long devino) +{ + unsigned int virt_irq = sun4v_build_irq(pbm->devhandle, devino); + + if (!virt_irq) + return -ENOMEM; + + if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE)) + return -EINVAL; + if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID)) + return -EINVAL; + + return virt_irq; +} + +static const struct sparc64_msiq_ops pci_sun4v_msiq_ops = { + .get_head = pci_sun4v_get_head, + .dequeue_msi = pci_sun4v_dequeue_msi, + .set_head = pci_sun4v_set_head, + .msi_setup = pci_sun4v_msi_setup, + .msi_teardown = pci_sun4v_msi_teardown, + .msiq_alloc = pci_sun4v_msiq_alloc, + .msiq_free = pci_sun4v_msiq_free, + .msiq_build_irq = pci_sun4v_msiq_build_irq, +}; + +static void pci_sun4v_msi_init(struct pci_pbm_info *pbm) +{ + sparc64_pbm_msi_init(pbm, &pci_sun4v_msiq_ops); +} +#else /* CONFIG_PCI_MSI */ +static void pci_sun4v_msi_init(struct pci_pbm_info *pbm) +{ +} +#endif /* !(CONFIG_PCI_MSI) */ + +static int __init pci_sun4v_pbm_init(struct pci_pbm_info *pbm, + struct of_device *op, u32 devhandle) +{ + struct device_node *dp = op->node; + int err; + + pbm->numa_node = of_node_to_nid(dp); + + pbm->pci_ops = &sun4v_pci_ops; + pbm->config_space_reg_bits = 12; + + pbm->index = pci_num_pbms++; + + pbm->op = op; + + pbm->devhandle = devhandle; + + pbm->name = dp->full_name; + + printk("%s: SUN4V PCI Bus Module\n", pbm->name); + printk("%s: On NUMA node %d\n", pbm->name, pbm->numa_node); + + pci_determine_mem_io_space(pbm); + + pci_get_pbm_props(pbm); + + err = pci_sun4v_iommu_init(pbm); + if (err) + return err; + + pci_sun4v_msi_init(pbm); + + pci_sun4v_scan_bus(pbm, &op->dev); + + pbm->next = pci_pbm_root; + pci_pbm_root = pbm; + + return 0; +} + +static int __devinit pci_sun4v_probe(struct of_device *op, + const struct of_device_id *match) +{ + const struct linux_prom64_registers *regs; + static int hvapi_negotiated = 0; + struct pci_pbm_info *pbm; + struct device_node *dp; + struct iommu *iommu; + u32 devhandle; + int i, err; + + dp = op->node; + + if (!hvapi_negotiated++) { + err = sun4v_hvapi_register(HV_GRP_PCI, + vpci_major, + &vpci_minor); + + if (err) { + printk(KERN_ERR PFX "Could not register hvapi, " + "err=%d\n", err); + return err; + } + printk(KERN_INFO PFX "Registered hvapi major[%lu] minor[%lu]\n", + vpci_major, vpci_minor); + + dma_ops = &sun4v_dma_ops; + } + + regs = of_get_property(dp, "reg", NULL); + err = -ENODEV; + if (!regs) { + printk(KERN_ERR PFX "Could not find config registers\n"); + goto out_err; + } + devhandle = (regs->phys_addr >> 32UL) & 0x0fffffff; + + err = -ENOMEM; + if (!iommu_batch_initialized) { + for_each_possible_cpu(i) { + unsigned long page = get_zeroed_page(GFP_KERNEL); + + if (!page) + goto out_err; + + per_cpu(iommu_batch, i).pglist = (u64 *) page; + } + iommu_batch_initialized = 1; + } + + pbm = kzalloc(sizeof(*pbm), GFP_KERNEL); + if (!pbm) { + printk(KERN_ERR PFX "Could not allocate pci_pbm_info\n"); + goto out_err; + } + + iommu = kzalloc(sizeof(struct iommu), GFP_KERNEL); + if (!iommu) { + printk(KERN_ERR PFX "Could not allocate pbm iommu\n"); + goto out_free_controller; + } + + pbm->iommu = iommu; + + err = pci_sun4v_pbm_init(pbm, op, devhandle); + if (err) + goto out_free_iommu; + + dev_set_drvdata(&op->dev, pbm); + + return 0; + +out_free_iommu: + kfree(pbm->iommu); + +out_free_controller: + kfree(pbm); + +out_err: + return err; +} + +static struct of_device_id __initdata pci_sun4v_match[] = { + { + .name = "pci", + .compatible = "SUNW,sun4v-pci", + }, + {}, +}; + +static struct of_platform_driver pci_sun4v_driver = { + .name = DRIVER_NAME, + .match_table = pci_sun4v_match, + .probe = pci_sun4v_probe, +}; + +static int __init pci_sun4v_init(void) +{ + return of_register_driver(&pci_sun4v_driver, &of_bus_type); +} + +subsys_initcall(pci_sun4v_init); |