diff options
Diffstat (limited to 'arch/x86_64/kernel/tce.c')
| -rw-r--r-- | arch/x86_64/kernel/tce.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/tce.c b/arch/x86_64/kernel/tce.c new file mode 100644 index 000000000000..8d4c67f61b8e --- /dev/null +++ b/arch/x86_64/kernel/tce.c @@ -0,0 +1,202 @@ +/* + * Derived from arch/powerpc/platforms/pseries/iommu.c + * + * Copyright (C) 2006 Jon Mason <jdmason@us.ibm.com>, IBM Corporation + * Copyright (C) 2006 Muli Ben-Yehuda <muli@il.ibm.com>, IBM Corporation + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/config.h> +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/mm.h> +#include <linux/spinlock.h> +#include <linux/string.h> +#include <linux/pci.h> +#include <linux/dma-mapping.h> +#include <linux/bootmem.h> +#include <asm/tce.h> +#include <asm/calgary.h> +#include <asm/proto.h> + +/* flush a tce at 'tceaddr' to main memory */ +static inline void flush_tce(void* tceaddr) +{ + /* a single tce can't cross a cache line */ + if (cpu_has_clflush) + asm volatile("clflush (%0)" :: "r" (tceaddr)); + else + asm volatile("wbinvd":::"memory"); +} + +void tce_build(struct iommu_table *tbl, unsigned long index, + unsigned int npages, unsigned long uaddr, int direction) +{ + u64* tp; + u64 t; + u64 rpn; + + t = (1 << TCE_READ_SHIFT); + if (direction != DMA_TO_DEVICE) + t |= (1 << TCE_WRITE_SHIFT); + + tp = ((u64*)tbl->it_base) + index; + + while (npages--) { + rpn = (virt_to_bus((void*)uaddr)) >> PAGE_SHIFT; + t &= ~TCE_RPN_MASK; + t |= (rpn << TCE_RPN_SHIFT); + + *tp = cpu_to_be64(t); + flush_tce(tp); + + uaddr += PAGE_SIZE; + tp++; + } +} + +void tce_free(struct iommu_table *tbl, long index, unsigned int npages) +{ + u64* tp; + + tp = ((u64*)tbl->it_base) + index; + + while (npages--) { + *tp = cpu_to_be64(0); + flush_tce(tp); + tp++; + } +} + +static inline unsigned int table_size_to_number_of_entries(unsigned char size) +{ + /* + * size is the order of the table, 0-7 + * smallest table is 8K entries, so shift result by 13 to + * multiply by 8K + */ + return (1 << size) << 13; +} + +static int tce_table_setparms(struct pci_dev *dev, struct iommu_table *tbl) +{ + unsigned int bitmapsz; + unsigned int tce_table_index; + unsigned long bmppages; + int ret; + + tbl->it_busno = dev->bus->number; + + /* set the tce table size - measured in entries */ + tbl->it_size = table_size_to_number_of_entries(specified_table_size); + + tce_table_index = bus_to_phb(tbl->it_busno); + tbl->it_base = (unsigned long)tce_table_kva[tce_table_index]; + if (!tbl->it_base) { + printk(KERN_ERR "Calgary: iommu_table_setparms: " + "no table allocated?!\n"); + ret = -ENOMEM; + goto done; + } + + /* + * number of bytes needed for the bitmap size in number of + * entries; we need one bit per entry + */ + bitmapsz = tbl->it_size / BITS_PER_BYTE; + bmppages = __get_free_pages(GFP_KERNEL, get_order(bitmapsz)); + if (!bmppages) { + printk(KERN_ERR "Calgary: cannot allocate bitmap\n"); + ret = -ENOMEM; + goto done; + } + + tbl->it_map = (unsigned long*)bmppages; + + memset(tbl->it_map, 0, bitmapsz); + + tbl->it_hint = 0; + + spin_lock_init(&tbl->it_lock); + + return 0; + +done: + return ret; +} + +int build_tce_table(struct pci_dev *dev, void __iomem *bbar) +{ + struct iommu_table *tbl; + int ret; + + if (dev->sysdata) { + printk(KERN_ERR "Calgary: dev %p has sysdata %p\n", + dev, dev->sysdata); + BUG(); + } + + tbl = kzalloc(sizeof(struct iommu_table), GFP_KERNEL); + if (!tbl) { + printk(KERN_ERR "Calgary: error allocating iommu_table\n"); + ret = -ENOMEM; + goto done; + } + + ret = tce_table_setparms(dev, tbl); + if (ret) + goto free_tbl; + + tce_free(tbl, 0, tbl->it_size); + + tbl->bbar = bbar; + + /* + * NUMA is already using the bus's sysdata pointer, so we use + * the bus's pci_dev's sysdata instead. + */ + dev->sysdata = tbl; + + return 0; + +free_tbl: + kfree(tbl); +done: + return ret; +} + +void* alloc_tce_table(void) +{ + unsigned int size; + + size = table_size_to_number_of_entries(specified_table_size); + size *= TCE_ENTRY_SIZE; + + return __alloc_bootmem_low(size, size, 0); +} + +void free_tce_table(void *tbl) +{ + unsigned int size; + + if (!tbl) + return; + + size = table_size_to_number_of_entries(specified_table_size); + size *= TCE_ENTRY_SIZE; + + free_bootmem(__pa(tbl), size); +} |