diff options
Diffstat (limited to 'arch/sparc/kernel/pci_sun4v.c')
| -rw-r--r-- | arch/sparc/kernel/pci_sun4v.c | 1350 |
1 files changed, 1350 insertions, 0 deletions
diff --git a/arch/sparc/kernel/pci_sun4v.c b/arch/sparc/kernel/pci_sun4v.c new file mode 100644 index 000000000..c80b0a21d --- /dev/null +++ b/arch/sparc/kernel/pci_sun4v.c @@ -0,0 +1,1350 @@ +// SPDX-License-Identifier: GPL-2.0 +/* 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/export.h> +#include <linux/log2.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/dma-map-ops.h> +#include <asm/iommu-common.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 "kernel.h" + +#include "pci_sun4v.h" + +#define DRIVER_NAME "pci_sun4v" +#define PFX DRIVER_NAME ": " + +static unsigned long vpci_major; +static unsigned long vpci_minor; + +struct vpci_version { + unsigned long major; + unsigned long minor; +}; + +/* Ordered from largest major to lowest */ +static struct vpci_version vpci_versions[] = { + { .major = 2, .minor = 0 }, + { .major = 1, .minor = 1 }, +}; + +static unsigned long vatu_major = 1; +static unsigned long vatu_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 = this_cpu_ptr(&iommu_batch); + + p->dev = dev; + p->prot = prot; + p->entry = entry; + p->npages = 0; +} + +static inline bool iommu_use_atu(struct iommu *iommu, u64 mask) +{ + return iommu->atu && mask > DMA_BIT_MASK(32); +} + +/* Interrupts must be disabled. */ +static long iommu_batch_flush(struct iommu_batch *p, u64 mask) +{ + struct pci_pbm_info *pbm = p->dev->archdata.host_controller; + u64 *pglist = p->pglist; + u64 index_count; + unsigned long devhandle = pbm->devhandle; + unsigned long prot = p->prot; + unsigned long entry = p->entry; + unsigned long npages = p->npages; + unsigned long iotsb_num; + unsigned long ret; + long num; + + /* VPCI maj=1, min=[0,1] only supports read and write */ + if (vpci_major < 2) + prot &= (HV_PCI_MAP_ATTR_READ | HV_PCI_MAP_ATTR_WRITE); + + while (npages != 0) { + if (!iommu_use_atu(pbm->iommu, mask)) { + num = pci_sun4v_iommu_map(devhandle, + HV_PCI_TSBID(0, entry), + npages, + prot, + __pa(pglist)); + if (unlikely(num < 0)) { + pr_err_ratelimited("%s: IOMMU map of [%08lx:%08llx:%lx:%lx:%lx] failed with status %ld\n", + __func__, + devhandle, + HV_PCI_TSBID(0, entry), + npages, prot, __pa(pglist), + num); + return -1; + } + } else { + index_count = HV_PCI_IOTSB_INDEX_COUNT(npages, entry), + iotsb_num = pbm->iommu->atu->iotsb->iotsb_num; + ret = pci_sun4v_iotsb_map(devhandle, + iotsb_num, + index_count, + prot, + __pa(pglist), + &num); + if (unlikely(ret != HV_EOK)) { + pr_err_ratelimited("%s: ATU map of [%08lx:%lx:%llx:%lx:%lx] failed with status %ld\n", + __func__, + devhandle, iotsb_num, + index_count, prot, + __pa(pglist), ret); + 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, u64 mask) +{ + struct iommu_batch *p = this_cpu_ptr(&iommu_batch); + + if (p->entry + p->npages == entry) + return; + if (p->entry != ~0UL) + iommu_batch_flush(p, mask); + p->entry = entry; +} + +/* Interrupts must be disabled. */ +static inline long iommu_batch_add(u64 phys_page, u64 mask) +{ + struct iommu_batch *p = this_cpu_ptr(&iommu_batch); + + BUG_ON(p->npages >= PGLIST_NENTS); + + p->pglist[p->npages++] = phys_page; + if (p->npages == PGLIST_NENTS) + return iommu_batch_flush(p, mask); + + return 0; +} + +/* Interrupts must be disabled. */ +static inline long iommu_batch_end(u64 mask) +{ + struct iommu_batch *p = this_cpu_ptr(&iommu_batch); + + BUG_ON(p->npages >= PGLIST_NENTS); + + return iommu_batch_flush(p, mask); +} + +static void *dma_4v_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *dma_addrp, gfp_t gfp, + unsigned long attrs) +{ + u64 mask; + unsigned long flags, order, first_page, npages, n; + unsigned long prot = 0; + struct iommu *iommu; + struct iommu_map_table *tbl; + 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; + + if (attrs & DMA_ATTR_WEAK_ORDERING) + prot = HV_PCI_MAP_ATTR_RELAXED_ORDER; + + 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; + mask = dev->coherent_dma_mask; + if (!iommu_use_atu(iommu, mask)) + tbl = &iommu->tbl; + else + tbl = &iommu->atu->tbl; + + entry = iommu_tbl_range_alloc(dev, tbl, npages, NULL, + (unsigned long)(-1), 0); + + if (unlikely(entry == IOMMU_ERROR_CODE)) + goto range_alloc_fail; + + *dma_addrp = (tbl->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 | prot | + HV_PCI_MAP_ATTR_WRITE), + entry); + + for (n = 0; n < npages; n++) { + long err = iommu_batch_add(first_page + (n * PAGE_SIZE), mask); + if (unlikely(err < 0L)) + goto iommu_map_fail; + } + + if (unlikely(iommu_batch_end(mask) < 0L)) + goto iommu_map_fail; + + local_irq_restore(flags); + + return ret; + +iommu_map_fail: + local_irq_restore(flags); + iommu_tbl_range_free(tbl, *dma_addrp, npages, IOMMU_ERROR_CODE); + +range_alloc_fail: + free_pages(first_page, order); + return NULL; +} + +unsigned long dma_4v_iotsb_bind(unsigned long devhandle, + unsigned long iotsb_num, + struct pci_bus *bus_dev) +{ + struct pci_dev *pdev; + unsigned long err; + unsigned int bus; + unsigned int device; + unsigned int fun; + + list_for_each_entry(pdev, &bus_dev->devices, bus_list) { + if (pdev->subordinate) { + /* No need to bind pci bridge */ + dma_4v_iotsb_bind(devhandle, iotsb_num, + pdev->subordinate); + } else { + bus = bus_dev->number; + device = PCI_SLOT(pdev->devfn); + fun = PCI_FUNC(pdev->devfn); + err = pci_sun4v_iotsb_bind(devhandle, iotsb_num, + HV_PCI_DEVICE_BUILD(bus, + device, + fun)); + + /* If bind fails for one device it is going to fail + * for rest of the devices because we are sharing + * IOTSB. So in case of failure simply return with + * error. + */ + if (err) + return err; + } + } + + return 0; +} + +static void dma_4v_iommu_demap(struct device *dev, unsigned long devhandle, + dma_addr_t dvma, unsigned long iotsb_num, + unsigned long entry, unsigned long npages) +{ + unsigned long num, flags; + unsigned long ret; + + local_irq_save(flags); + do { + if (dvma <= DMA_BIT_MASK(32)) { + num = pci_sun4v_iommu_demap(devhandle, + HV_PCI_TSBID(0, entry), + npages); + } else { + ret = pci_sun4v_iotsb_demap(devhandle, iotsb_num, + entry, npages, &num); + if (unlikely(ret != HV_EOK)) { + pr_err_ratelimited("pci_iotsb_demap() failed with error: %ld\n", + ret); + } + } + entry += num; + npages -= num; + } while (npages != 0); + local_irq_restore(flags); +} + +static void dma_4v_free_coherent(struct device *dev, size_t size, void *cpu, + dma_addr_t dvma, unsigned long attrs) +{ + struct pci_pbm_info *pbm; + struct iommu *iommu; + struct atu *atu; + struct iommu_map_table *tbl; + unsigned long order, npages, entry; + unsigned long iotsb_num; + u32 devhandle; + + npages = IO_PAGE_ALIGN(size) >> IO_PAGE_SHIFT; + iommu = dev->archdata.iommu; + pbm = dev->archdata.host_controller; + atu = iommu->atu; + devhandle = pbm->devhandle; + + if (!iommu_use_atu(iommu, dvma)) { + tbl = &iommu->tbl; + iotsb_num = 0; /* we don't care for legacy iommu */ + } else { + tbl = &atu->tbl; + iotsb_num = atu->iotsb->iotsb_num; + } + entry = ((dvma - tbl->table_map_base) >> IO_PAGE_SHIFT); + dma_4v_iommu_demap(dev, devhandle, dvma, iotsb_num, entry, npages); + iommu_tbl_range_free(tbl, dvma, npages, IOMMU_ERROR_CODE); + order = get_order(size); + if (order < 10) + free_pages((unsigned long)cpu, order); +} + +static dma_addr_t dma_4v_map_page(struct device *dev, struct page *page, + unsigned long offset, size_t sz, + enum dma_data_direction direction, + unsigned long attrs) +{ + struct iommu *iommu; + struct atu *atu; + struct iommu_map_table *tbl; + u64 mask; + unsigned long flags, npages, oaddr; + unsigned long i, base_paddr; + unsigned long prot; + dma_addr_t bus_addr, ret; + long entry; + + iommu = dev->archdata.iommu; + atu = iommu->atu; + + if (unlikely(direction == DMA_NONE)) + goto bad; + + oaddr = (unsigned long)(page_address(page) + offset); + npages = IO_PAGE_ALIGN(oaddr + sz) - (oaddr & IO_PAGE_MASK); + npages >>= IO_PAGE_SHIFT; + + mask = *dev->dma_mask; + if (!iommu_use_atu(iommu, mask)) + tbl = &iommu->tbl; + else + tbl = &atu->tbl; + + entry = iommu_tbl_range_alloc(dev, tbl, npages, NULL, + (unsigned long)(-1), 0); + + if (unlikely(entry == IOMMU_ERROR_CODE)) + goto bad; + + bus_addr = (tbl->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; + + if (attrs & DMA_ATTR_WEAK_ORDERING) + prot |= HV_PCI_MAP_ATTR_RELAXED_ORDER; + + 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, mask); + if (unlikely(err < 0L)) + goto iommu_map_fail; + } + if (unlikely(iommu_batch_end(mask) < 0L)) + goto iommu_map_fail; + + local_irq_restore(flags); + + return ret; + +bad: + if (printk_ratelimit()) + WARN_ON(1); + return DMA_MAPPING_ERROR; + +iommu_map_fail: + local_irq_restore(flags); + iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE); + return DMA_MAPPING_ERROR; +} + +static void dma_4v_unmap_page(struct device *dev, dma_addr_t bus_addr, + size_t sz, enum dma_data_direction direction, + unsigned long attrs) +{ + struct pci_pbm_info *pbm; + struct iommu *iommu; + struct atu *atu; + struct iommu_map_table *tbl; + unsigned long npages; + unsigned long iotsb_num; + 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; + atu = iommu->atu; + devhandle = pbm->devhandle; + + npages = IO_PAGE_ALIGN(bus_addr + sz) - (bus_addr & IO_PAGE_MASK); + npages >>= IO_PAGE_SHIFT; + bus_addr &= IO_PAGE_MASK; + + if (bus_addr <= DMA_BIT_MASK(32)) { + iotsb_num = 0; /* we don't care for legacy iommu */ + tbl = &iommu->tbl; + } else { + iotsb_num = atu->iotsb->iotsb_num; + tbl = &atu->tbl; + } + entry = (bus_addr - tbl->table_map_base) >> IO_PAGE_SHIFT; + dma_4v_iommu_demap(dev, devhandle, bus_addr, iotsb_num, entry, npages); + iommu_tbl_range_free(tbl, bus_addr, npages, IOMMU_ERROR_CODE); +} + +static int dma_4v_map_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + unsigned long attrs) +{ + 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; + struct atu *atu; + struct iommu_map_table *tbl; + u64 mask; + unsigned long base_shift; + long err; + + BUG_ON(direction == DMA_NONE); + + iommu = dev->archdata.iommu; + if (nelems == 0 || !iommu) + return -EINVAL; + atu = iommu->atu; + + prot = HV_PCI_MAP_ATTR_READ; + if (direction != DMA_TO_DEVICE) + prot |= HV_PCI_MAP_ATTR_WRITE; + + if (attrs & DMA_ATTR_WEAK_ORDERING) + prot |= HV_PCI_MAP_ATTR_RELAXED_ORDER; + + outs = s = segstart = &sglist[0]; + outcount = 1; + incount = nelems; + handle = 0; + + /* Init first segment length for backout at failure */ + outs->dma_length = 0; + + local_irq_save(flags); + + iommu_batch_start(dev, prot, ~0UL); + + max_seg_size = dma_get_max_seg_size(dev); + seg_boundary_size = dma_get_seg_boundary_nr_pages(dev, IO_PAGE_SHIFT); + + mask = *dev->dma_mask; + if (!iommu_use_atu(iommu, mask)) + tbl = &iommu->tbl; + else + tbl = &atu->tbl; + + base_shift = tbl->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_tbl_range_alloc(dev, tbl, npages, + &handle, (unsigned long)(-1), 0); + + /* Handle failure */ + if (unlikely(entry == IOMMU_ERROR_CODE)) { + pr_err_ratelimited("iommu_alloc failed, iommu %p paddr %lx npages %lx\n", + tbl, paddr, npages); + goto iommu_map_failed; + } + + iommu_batch_new_entry(entry, mask); + + /* Convert entry to a dma_addr_t */ + dma_addr = tbl->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, mask); + 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(mask); + + if (unlikely(err < 0L)) + goto iommu_map_failed; + + local_irq_restore(flags); + + if (outcount < incount) { + outs = sg_next(outs); + 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_tbl_range_free(tbl, vaddr, npages, + IOMMU_ERROR_CODE); + /* XXX demap? XXX */ + s->dma_length = 0; + } + if (s == outs) + break; + } + local_irq_restore(flags); + + return -EINVAL; +} + +static void dma_4v_unmap_sg(struct device *dev, struct scatterlist *sglist, + int nelems, enum dma_data_direction direction, + unsigned long attrs) +{ + struct pci_pbm_info *pbm; + struct scatterlist *sg; + struct iommu *iommu; + struct atu *atu; + unsigned long flags, entry; + unsigned long iotsb_num; + u32 devhandle; + + BUG_ON(direction == DMA_NONE); + + iommu = dev->archdata.iommu; + pbm = dev->archdata.host_controller; + atu = iommu->atu; + devhandle = pbm->devhandle; + + local_irq_save(flags); + + sg = sglist; + while (nelems--) { + dma_addr_t dma_handle = sg->dma_address; + unsigned int len = sg->dma_length; + unsigned long npages; + struct iommu_map_table *tbl; + unsigned long shift = IO_PAGE_SHIFT; + + if (!len) + break; + npages = iommu_num_pages(dma_handle, len, IO_PAGE_SIZE); + + if (dma_handle <= DMA_BIT_MASK(32)) { + iotsb_num = 0; /* we don't care for legacy iommu */ + tbl = &iommu->tbl; + } else { + iotsb_num = atu->iotsb->iotsb_num; + tbl = &atu->tbl; + } + entry = ((dma_handle - tbl->table_map_base) >> shift); + dma_4v_iommu_demap(dev, devhandle, dma_handle, iotsb_num, + entry, npages); + iommu_tbl_range_free(tbl, dma_handle, npages, + IOMMU_ERROR_CODE); + sg = sg_next(sg); + } + + local_irq_restore(flags); +} + +static int dma_4v_supported(struct device *dev, u64 device_mask) +{ + struct iommu *iommu = dev->archdata.iommu; + + if (ali_sound_dma_hack(dev, device_mask)) + return 1; + if (device_mask < iommu->dma_addr_mask) + return 0; + return 1; +} + +static const struct dma_map_ops sun4v_dma_ops = { + .alloc = dma_4v_alloc_coherent, + .free = dma_4v_free_coherent, + .map_page = dma_4v_map_page, + .unmap_page = dma_4v_unmap_page, + .map_sg = dma_4v_map_sg, + .unmap_sg = dma_4v_unmap_sg, + .dma_supported = dma_4v_supported, +}; + +static void pci_sun4v_scan_bus(struct pci_pbm_info *pbm, struct device *parent) +{ + struct property *prop; + struct device_node *dp; + + dp = pbm->op->dev.of_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 probe_existing_entries(struct pci_pbm_info *pbm, + struct iommu_map_table *iommu) +{ + struct iommu_pool *pool; + unsigned long i, pool_nr, cnt = 0; + u32 devhandle; + + devhandle = pbm->devhandle; + for (pool_nr = 0; pool_nr < iommu->nr_pools; pool_nr++) { + pool = &(iommu->pools[pool_nr]); + for (i = pool->start; i <= pool->end; 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, iommu->map); + } + } + } + } + return cnt; +} + +static int pci_sun4v_atu_alloc_iotsb(struct pci_pbm_info *pbm) +{ + struct atu *atu = pbm->iommu->atu; + struct atu_iotsb *iotsb; + void *table; + u64 table_size; + u64 iotsb_num; + unsigned long order; + unsigned long err; + + iotsb = kzalloc(sizeof(*iotsb), GFP_KERNEL); + if (!iotsb) { + err = -ENOMEM; + goto out_err; + } + atu->iotsb = iotsb; + + /* calculate size of IOTSB */ + table_size = (atu->size / IO_PAGE_SIZE) * 8; + order = get_order(table_size); + table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO, order); + if (!table) { + err = -ENOMEM; + goto table_failed; + } + iotsb->table = table; + iotsb->ra = __pa(table); + iotsb->dvma_size = atu->size; + iotsb->dvma_base = atu->base; + iotsb->table_size = table_size; + iotsb->page_size = IO_PAGE_SIZE; + + /* configure and register IOTSB with HV */ + err = pci_sun4v_iotsb_conf(pbm->devhandle, + iotsb->ra, + iotsb->table_size, + iotsb->page_size, + iotsb->dvma_base, + &iotsb_num); + if (err) { + pr_err(PFX "pci_iotsb_conf failed error: %ld\n", err); + goto iotsb_conf_failed; + } + iotsb->iotsb_num = iotsb_num; + + err = dma_4v_iotsb_bind(pbm->devhandle, iotsb_num, pbm->pci_bus); + if (err) { + pr_err(PFX "pci_iotsb_bind failed error: %ld\n", err); + goto iotsb_conf_failed; + } + + return 0; + +iotsb_conf_failed: + free_pages((unsigned long)table, order); +table_failed: + kfree(iotsb); +out_err: + return err; +} + +static int pci_sun4v_atu_init(struct pci_pbm_info *pbm) +{ + struct atu *atu = pbm->iommu->atu; + unsigned long err; + const u64 *ranges; + u64 map_size, num_iotte; + u64 dma_mask; + const u32 *page_size; + int len; + + ranges = of_get_property(pbm->op->dev.of_node, "iommu-address-ranges", + &len); + if (!ranges) { + pr_err(PFX "No iommu-address-ranges\n"); + return -EINVAL; + } + + page_size = of_get_property(pbm->op->dev.of_node, "iommu-pagesizes", + NULL); + if (!page_size) { + pr_err(PFX "No iommu-pagesizes\n"); + return -EINVAL; + } + + /* There are 4 iommu-address-ranges supported. Each range is pair of + * {base, size}. The ranges[0] and ranges[1] are 32bit address space + * while ranges[2] and ranges[3] are 64bit space. We want to use 64bit + * address ranges to support 64bit addressing. Because 'size' for + * address ranges[2] and ranges[3] are same we can select either of + * ranges[2] or ranges[3] for mapping. However due to 'size' is too + * large for OS to allocate IOTSB we are using fix size 32G + * (ATU_64_SPACE_SIZE) which is more than enough for all PCIe devices + * to share. + */ + atu->ranges = (struct atu_ranges *)ranges; + atu->base = atu->ranges[3].base; + atu->size = ATU_64_SPACE_SIZE; + + /* Create IOTSB */ + err = pci_sun4v_atu_alloc_iotsb(pbm); + if (err) { + pr_err(PFX "Error creating ATU IOTSB\n"); + return err; + } + + /* Create ATU iommu map. + * One bit represents one iotte in IOTSB table. + */ + dma_mask = (roundup_pow_of_two(atu->size) - 1UL); + num_iotte = atu->size / IO_PAGE_SIZE; + map_size = num_iotte / 8; + atu->tbl.table_map_base = atu->base; + atu->dma_addr_mask = dma_mask; + atu->tbl.map = kzalloc(map_size, GFP_KERNEL); + if (!atu->tbl.map) + return -ENOMEM; + + iommu_tbl_pool_init(&atu->tbl, num_iotte, IO_PAGE_SHIFT, + NULL, false /* no large_pool */, + 0 /* default npools */, + false /* want span boundary checking */); + + return 0; +} + +static int 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; + u32 dma_mask, dma_offset; + const u32 *vdma; + + vdma = of_get_property(pbm->op->dev.of_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; + + dma_offset = vdma[0]; + + /* Setup initial software IOMMU state. */ + spin_lock_init(&iommu->lock); + iommu->ctx_lowest_free = 1; + iommu->tbl.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->tbl.map = kzalloc(sz, GFP_KERNEL); + if (!iommu->tbl.map) { + printk(KERN_ERR PFX "Error, kmalloc(arena.map) failed.\n"); + return -ENOMEM; + } + iommu_tbl_pool_init(&iommu->tbl, num_tsb_entries, IO_PAGE_SHIFT, + NULL, false /* no large_pool */, + 0 /* default npools */, + false /* want span boundary checking */); + sz = probe_existing_entries(pbm, &iommu->tbl); + 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 irq = sun4v_build_irq(pbm->devhandle, devino); + + if (!irq) + return -ENOMEM; + + if (pci_sun4v_msiq_setvalid(pbm->devhandle, msiqid, HV_MSIQ_VALID)) + return -EINVAL; + if (pci_sun4v_msiq_setstate(pbm->devhandle, msiqid, HV_MSIQSTATE_IDLE)) + return -EINVAL; + + return 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 pci_sun4v_pbm_init(struct pci_pbm_info *pbm, + struct platform_device *op, u32 devhandle) +{ + struct device_node *dp = op->dev.of_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); + + /* if atu_init fails its not complete failure. + * we can still continue using legacy iommu. + */ + if (pbm->iommu->atu) { + err = pci_sun4v_atu_init(pbm); + if (err) { + kfree(pbm->iommu->atu); + pbm->iommu->atu = NULL; + pr_err(PFX "ATU init failed, err=%d\n", err); + } + } + + pbm->next = pci_pbm_root; + pci_pbm_root = pbm; + + return 0; +} + +static int pci_sun4v_probe(struct platform_device *op) +{ + const struct linux_prom64_registers *regs; + static int hvapi_negotiated = 0; + struct pci_pbm_info *pbm; + struct device_node *dp; + struct iommu *iommu; + struct atu *atu; + u32 devhandle; + int i, err = -ENODEV; + static bool hv_atu = true; + + dp = op->dev.of_node; + + if (!hvapi_negotiated++) { + for (i = 0; i < ARRAY_SIZE(vpci_versions); i++) { + vpci_major = vpci_versions[i].major; + vpci_minor = vpci_versions[i].minor; + + err = sun4v_hvapi_register(HV_GRP_PCI, vpci_major, + &vpci_minor); + if (!err) + break; + } + + if (err) { + pr_err(PFX "Could not register hvapi, err=%d\n", err); + return err; + } + pr_info(PFX "Registered hvapi major[%lu] minor[%lu]\n", + vpci_major, vpci_minor); + + err = sun4v_hvapi_register(HV_GRP_ATU, vatu_major, &vatu_minor); + if (err) { + /* don't return an error if we fail to register the + * ATU group, but ATU hcalls won't be available. + */ + hv_atu = false; + } else { + pr_info(PFX "Registered hvapi ATU major[%lu] minor[%lu]\n", + vatu_major, vatu_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; + iommu->atu = NULL; + if (hv_atu) { + atu = kzalloc(sizeof(*atu), GFP_KERNEL); + if (!atu) + pr_err(PFX "Could not allocate atu\n"); + else + iommu->atu = atu; + } + + 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(iommu->atu); + kfree(pbm->iommu); + +out_free_controller: + kfree(pbm); + +out_err: + return err; +} + +static const struct of_device_id pci_sun4v_match[] = { + { + .name = "pci", + .compatible = "SUNW,sun4v-pci", + }, + {}, +}; + +static struct platform_driver pci_sun4v_driver = { + .driver = { + .name = DRIVER_NAME, + .of_match_table = pci_sun4v_match, + }, + .probe = pci_sun4v_probe, +}; + +static int __init pci_sun4v_init(void) +{ + return platform_driver_register(&pci_sun4v_driver); +} + +subsys_initcall(pci_sun4v_init); |