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linux_dsm_epyc7002/arch/x86/kernel/pci-calgary_64.c
WANG Chao 0534af01cc x86, calgary: Use 8M TCE table size by default 
New kexec-tools wants to pass kdump kernel needed memmap via E820
directly, instead of memmap=exactmap. This makes saved_max_pfn not
be passed down to 2nd kernel. To keep 1st kernel and 2nd kernel using
the same TCE table size, Muli suggest to hard code the size to max (8M).

We can't get rid of saved_max_pfn this time, for backward compatibility
with old first kernel and new second kernel. However new first kernel
and old second kernel can not work unfortunately.

v2->v1:
- retain saved_max_pfn so new 2nd kernel can work with old 1st kernel
  from Vivek

Signed-off-by: WANG Chao <chaowang@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
Acked-by: Muli Ben-Yehuda <mulix@mulix.org>
Acked-by: Jon Mason <jdmason@kudzu.us>
Link: http://lkml.kernel.org/r/1394463120-26999-1-git-send-email-chaowang@redhat.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2014-04-10 19:51:32 -07:00

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/*
* Derived from arch/powerpc/kernel/iommu.c
*
* Copyright IBM Corporation, 2006-2007
* Copyright (C) 2006 Jon Mason <jdmason@kudzu.us>
*
* Author: Jon Mason <jdmason@kudzu.us>
* Author: Muli Ben-Yehuda <muli@il.ibm.com>
* 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
*/
#define pr_fmt(fmt) "Calgary: " fmt
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/crash_dump.h>
#include <linux/dma-mapping.h>
#include <linux/bitmap.h>
#include <linux/pci_ids.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/iommu-helper.h>
#include <asm/iommu.h>
#include <asm/calgary.h>
#include <asm/tce.h>
#include <asm/pci-direct.h>
#include <asm/dma.h>
#include <asm/rio.h>
#include <asm/bios_ebda.h>
#include <asm/x86_init.h>
#include <asm/iommu_table.h>
#ifdef CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT
int use_calgary __read_mostly = 1;
#else
int use_calgary __read_mostly = 0;
#endif /* CONFIG_CALGARY_DEFAULT_ENABLED */
#define PCI_DEVICE_ID_IBM_CALGARY 0x02a1
#define PCI_DEVICE_ID_IBM_CALIOC2 0x0308
/* register offsets inside the host bridge space */
#define CALGARY_CONFIG_REG 0x0108
#define PHB_CSR_OFFSET 0x0110 /* Channel Status */
#define PHB_PLSSR_OFFSET 0x0120
#define PHB_CONFIG_RW_OFFSET 0x0160
#define PHB_IOBASE_BAR_LOW 0x0170
#define PHB_IOBASE_BAR_HIGH 0x0180
#define PHB_MEM_1_LOW 0x0190
#define PHB_MEM_1_HIGH 0x01A0
#define PHB_IO_ADDR_SIZE 0x01B0
#define PHB_MEM_1_SIZE 0x01C0
#define PHB_MEM_ST_OFFSET 0x01D0
#define PHB_AER_OFFSET 0x0200
#define PHB_CONFIG_0_HIGH 0x0220
#define PHB_CONFIG_0_LOW 0x0230
#define PHB_CONFIG_0_END 0x0240
#define PHB_MEM_2_LOW 0x02B0
#define PHB_MEM_2_HIGH 0x02C0
#define PHB_MEM_2_SIZE_HIGH 0x02D0
#define PHB_MEM_2_SIZE_LOW 0x02E0
#define PHB_DOSHOLE_OFFSET 0x08E0
/* CalIOC2 specific */
#define PHB_SAVIOR_L2 0x0DB0
#define PHB_PAGE_MIG_CTRL 0x0DA8
#define PHB_PAGE_MIG_DEBUG 0x0DA0
#define PHB_ROOT_COMPLEX_STATUS 0x0CB0
/* PHB_CONFIG_RW */
#define PHB_TCE_ENABLE 0x20000000
#define PHB_SLOT_DISABLE 0x1C000000
#define PHB_DAC_DISABLE 0x01000000
#define PHB_MEM2_ENABLE 0x00400000
#define PHB_MCSR_ENABLE 0x00100000
/* TAR (Table Address Register) */
#define TAR_SW_BITS 0x0000ffffffff800fUL
#define TAR_VALID 0x0000000000000008UL
/* CSR (Channel/DMA Status Register) */
#define CSR_AGENT_MASK 0xffe0ffff
/* CCR (Calgary Configuration Register) */
#define CCR_2SEC_TIMEOUT 0x000000000000000EUL
/* PMCR/PMDR (Page Migration Control/Debug Registers */
#define PMR_SOFTSTOP 0x80000000
#define PMR_SOFTSTOPFAULT 0x40000000
#define PMR_HARDSTOP 0x20000000
/*
* The maximum PHB bus number.
* x3950M2 (rare): 8 chassis, 48 PHBs per chassis = 384
* x3950M2: 4 chassis, 48 PHBs per chassis = 192
* x3950 (PCIE): 8 chassis, 32 PHBs per chassis = 256
* x3950 (PCIX): 8 chassis, 16 PHBs per chassis = 128
*/
#define MAX_PHB_BUS_NUM 256
#define PHBS_PER_CALGARY 4
/* register offsets in Calgary's internal register space */
static const unsigned long tar_offsets[] = {
0x0580 /* TAR0 */,
0x0588 /* TAR1 */,
0x0590 /* TAR2 */,
0x0598 /* TAR3 */
};
static const unsigned long split_queue_offsets[] = {
0x4870 /* SPLIT QUEUE 0 */,
0x5870 /* SPLIT QUEUE 1 */,
0x6870 /* SPLIT QUEUE 2 */,
0x7870 /* SPLIT QUEUE 3 */
};
static const unsigned long phb_offsets[] = {
0x8000 /* PHB0 */,
0x9000 /* PHB1 */,
0xA000 /* PHB2 */,
0xB000 /* PHB3 */
};
/* PHB debug registers */
static const unsigned long phb_debug_offsets[] = {
0x4000 /* PHB 0 DEBUG */,
0x5000 /* PHB 1 DEBUG */,
0x6000 /* PHB 2 DEBUG */,
0x7000 /* PHB 3 DEBUG */
};
/*
* STUFF register for each debug PHB,
* byte 1 = start bus number, byte 2 = end bus number
*/
#define PHB_DEBUG_STUFF_OFFSET 0x0020
#define EMERGENCY_PAGES 32 /* = 128KB */
unsigned int specified_table_size = TCE_TABLE_SIZE_UNSPECIFIED;
static int translate_empty_slots __read_mostly = 0;
static int calgary_detected __read_mostly = 0;
static struct rio_table_hdr *rio_table_hdr __initdata;
static struct scal_detail *scal_devs[MAX_NUMNODES] __initdata;
static struct rio_detail *rio_devs[MAX_NUMNODES * 4] __initdata;
struct calgary_bus_info {
void *tce_space;
unsigned char translation_disabled;
signed char phbid;
void __iomem *bbar;
};
static void calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
static void calgary_tce_cache_blast(struct iommu_table *tbl);
static void calgary_dump_error_regs(struct iommu_table *tbl);
static void calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev);
static void calioc2_tce_cache_blast(struct iommu_table *tbl);
static void calioc2_dump_error_regs(struct iommu_table *tbl);
static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl);
static void get_tce_space_from_tar(void);
static struct cal_chipset_ops calgary_chip_ops = {
.handle_quirks = calgary_handle_quirks,
.tce_cache_blast = calgary_tce_cache_blast,
.dump_error_regs = calgary_dump_error_regs
};
static struct cal_chipset_ops calioc2_chip_ops = {
.handle_quirks = calioc2_handle_quirks,
.tce_cache_blast = calioc2_tce_cache_blast,
.dump_error_regs = calioc2_dump_error_regs
};
static struct calgary_bus_info bus_info[MAX_PHB_BUS_NUM] = { { NULL, 0, 0 }, };
static inline int translation_enabled(struct iommu_table *tbl)
{
/* only PHBs with translation enabled have an IOMMU table */
return (tbl != NULL);
}
static void iommu_range_reserve(struct iommu_table *tbl,
unsigned long start_addr, unsigned int npages)
{
unsigned long index;
unsigned long end;
unsigned long flags;
index = start_addr >> PAGE_SHIFT;
/* bail out if we're asked to reserve a region we don't cover */
if (index >= tbl->it_size)
return;
end = index + npages;
if (end > tbl->it_size) /* don't go off the table */
end = tbl->it_size;
spin_lock_irqsave(&tbl->it_lock, flags);
bitmap_set(tbl->it_map, index, npages);
spin_unlock_irqrestore(&tbl->it_lock, flags);
}
static unsigned long iommu_range_alloc(struct device *dev,
struct iommu_table *tbl,
unsigned int npages)
{
unsigned long flags;
unsigned long offset;
unsigned long boundary_size;
boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
PAGE_SIZE) >> PAGE_SHIFT;
BUG_ON(npages == 0);
spin_lock_irqsave(&tbl->it_lock, flags);
offset = iommu_area_alloc(tbl->it_map, tbl->it_size, tbl->it_hint,
npages, 0, boundary_size, 0);
if (offset == ~0UL) {
tbl->chip_ops->tce_cache_blast(tbl);
offset = iommu_area_alloc(tbl->it_map, tbl->it_size, 0,
npages, 0, boundary_size, 0);
if (offset == ~0UL) {
pr_warn("IOMMU full\n");
spin_unlock_irqrestore(&tbl->it_lock, flags);
if (panic_on_overflow)
panic("Calgary: fix the allocator.\n");
else
return DMA_ERROR_CODE;
}
}
tbl->it_hint = offset + npages;
BUG_ON(tbl->it_hint > tbl->it_size);
spin_unlock_irqrestore(&tbl->it_lock, flags);
return offset;
}
static dma_addr_t iommu_alloc(struct device *dev, struct iommu_table *tbl,
void *vaddr, unsigned int npages, int direction)
{
unsigned long entry;
dma_addr_t ret;
entry = iommu_range_alloc(dev, tbl, npages);
if (unlikely(entry == DMA_ERROR_CODE)) {
pr_warn("failed to allocate %u pages in iommu %p\n",
npages, tbl);
return DMA_ERROR_CODE;
}
/* set the return dma address */
ret = (entry << PAGE_SHIFT) | ((unsigned long)vaddr & ~PAGE_MASK);
/* put the TCEs in the HW table */
tce_build(tbl, entry, npages, (unsigned long)vaddr & PAGE_MASK,
direction);
return ret;
}
static void iommu_free(struct iommu_table *tbl, dma_addr_t dma_addr,
unsigned int npages)
{
unsigned long entry;
unsigned long badend;
unsigned long flags;
/* were we called with bad_dma_address? */
badend = DMA_ERROR_CODE + (EMERGENCY_PAGES * PAGE_SIZE);
if (unlikely((dma_addr >= DMA_ERROR_CODE) && (dma_addr < badend))) {
WARN(1, KERN_ERR "Calgary: driver tried unmapping bad DMA "
"address 0x%Lx\n", dma_addr);
return;
}
entry = dma_addr >> PAGE_SHIFT;
BUG_ON(entry + npages > tbl->it_size);
tce_free(tbl, entry, npages);
spin_lock_irqsave(&tbl->it_lock, flags);
bitmap_clear(tbl->it_map, entry, npages);
spin_unlock_irqrestore(&tbl->it_lock, flags);
}
static inline struct iommu_table *find_iommu_table(struct device *dev)
{
struct pci_dev *pdev;
struct pci_bus *pbus;
struct iommu_table *tbl;
pdev = to_pci_dev(dev);
/* search up the device tree for an iommu */
pbus = pdev->bus;
do {
tbl = pci_iommu(pbus);
if (tbl && tbl->it_busno == pbus->number)
break;
tbl = NULL;
pbus = pbus->parent;
} while (pbus);
BUG_ON(tbl && (tbl->it_busno != pbus->number));
return tbl;
}
static void calgary_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems,enum dma_data_direction dir,
struct dma_attrs *attrs)
{
struct iommu_table *tbl = find_iommu_table(dev);
struct scatterlist *s;
int i;
if (!translation_enabled(tbl))
return;
for_each_sg(sglist, s, nelems, i) {
unsigned int npages;
dma_addr_t dma = s->dma_address;
unsigned int dmalen = s->dma_length;
if (dmalen == 0)
break;
npages = iommu_num_pages(dma, dmalen, PAGE_SIZE);
iommu_free(tbl, dma, npages);
}
}
static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
int nelems, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
struct iommu_table *tbl = find_iommu_table(dev);
struct scatterlist *s;
unsigned long vaddr;
unsigned int npages;
unsigned long entry;
int i;
for_each_sg(sg, s, nelems, i) {
BUG_ON(!sg_page(s));
vaddr = (unsigned long) sg_virt(s);
npages = iommu_num_pages(vaddr, s->length, PAGE_SIZE);
entry = iommu_range_alloc(dev, tbl, npages);
if (entry == DMA_ERROR_CODE) {
/* makes sure unmap knows to stop */
s->dma_length = 0;
goto error;
}
s->dma_address = (entry << PAGE_SHIFT) | s->offset;
/* insert into HW table */
tce_build(tbl, entry, npages, vaddr & PAGE_MASK, dir);
s->dma_length = s->length;
}
return nelems;
error:
calgary_unmap_sg(dev, sg, nelems, dir, NULL);
for_each_sg(sg, s, nelems, i) {
sg->dma_address = DMA_ERROR_CODE;
sg->dma_length = 0;
}
return 0;
}
static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
void *vaddr = page_address(page) + offset;
unsigned long uaddr;
unsigned int npages;
struct iommu_table *tbl = find_iommu_table(dev);
uaddr = (unsigned long)vaddr;
npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
return iommu_alloc(dev, tbl, vaddr, npages, dir);
}
static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
size_t size, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
struct iommu_table *tbl = find_iommu_table(dev);
unsigned int npages;
npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
iommu_free(tbl, dma_addr, npages);
}
static void* calgary_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag, struct dma_attrs *attrs)
{
void *ret = NULL;
dma_addr_t mapping;
unsigned int npages, order;
struct iommu_table *tbl = find_iommu_table(dev);
size = PAGE_ALIGN(size); /* size rounded up to full pages */
npages = size >> PAGE_SHIFT;
order = get_order(size);
flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
/* alloc enough pages (and possibly more) */
ret = (void *)__get_free_pages(flag, order);
if (!ret)
goto error;
memset(ret, 0, size);
/* set up tces to cover the allocated range */
mapping = iommu_alloc(dev, tbl, ret, npages, DMA_BIDIRECTIONAL);
if (mapping == DMA_ERROR_CODE)
goto free;
*dma_handle = mapping;
return ret;
free:
free_pages((unsigned long)ret, get_order(size));
ret = NULL;
error:
return ret;
}
static void calgary_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
struct dma_attrs *attrs)
{
unsigned int npages;
struct iommu_table *tbl = find_iommu_table(dev);
size = PAGE_ALIGN(size);
npages = size >> PAGE_SHIFT;
iommu_free(tbl, dma_handle, npages);
free_pages((unsigned long)vaddr, get_order(size));
}
static struct dma_map_ops calgary_dma_ops = {
.alloc = calgary_alloc_coherent,
.free = calgary_free_coherent,
.map_sg = calgary_map_sg,
.unmap_sg = calgary_unmap_sg,
.map_page = calgary_map_page,
.unmap_page = calgary_unmap_page,
};
static inline void __iomem * busno_to_bbar(unsigned char num)
{
return bus_info[num].bbar;
}
static inline int busno_to_phbid(unsigned char num)
{
return bus_info[num].phbid;
}
static inline unsigned long split_queue_offset(unsigned char num)
{
size_t idx = busno_to_phbid(num);
return split_queue_offsets[idx];
}
static inline unsigned long tar_offset(unsigned char num)
{
size_t idx = busno_to_phbid(num);
return tar_offsets[idx];
}
static inline unsigned long phb_offset(unsigned char num)
{
size_t idx = busno_to_phbid(num);
return phb_offsets[idx];
}
static inline void __iomem* calgary_reg(void __iomem *bar, unsigned long offset)
{
unsigned long target = ((unsigned long)bar) | offset;
return (void __iomem*)target;
}
static inline int is_calioc2(unsigned short device)
{
return (device == PCI_DEVICE_ID_IBM_CALIOC2);
}
static inline int is_calgary(unsigned short device)
{
return (device == PCI_DEVICE_ID_IBM_CALGARY);
}
static inline int is_cal_pci_dev(unsigned short device)
{
return (is_calgary(device) || is_calioc2(device));
}
static void calgary_tce_cache_blast(struct iommu_table *tbl)
{
u64 val;
u32 aer;
int i = 0;
void __iomem *bbar = tbl->bbar;
void __iomem *target;
/* disable arbitration on the bus */
target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
aer = readl(target);
writel(0, target);
/* read plssr to ensure it got there */
target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
val = readl(target);
/* poll split queues until all DMA activity is done */
target = calgary_reg(bbar, split_queue_offset(tbl->it_busno));
do {
val = readq(target);
i++;
} while ((val & 0xff) != 0xff && i < 100);
if (i == 100)
pr_warn("PCI bus not quiesced, continuing anyway\n");
/* invalidate TCE cache */
target = calgary_reg(bbar, tar_offset(tbl->it_busno));
writeq(tbl->tar_val, target);
/* enable arbitration */
target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_AER_OFFSET);
writel(aer, target);
(void)readl(target); /* flush */
}
static void calioc2_tce_cache_blast(struct iommu_table *tbl)
{
void __iomem *bbar = tbl->bbar;
void __iomem *target;
u64 val64;
u32 val;
int i = 0;
int count = 1;
unsigned char bus = tbl->it_busno;
begin:
printk(KERN_DEBUG "Calgary: CalIOC2 bus 0x%x entering tce cache blast "
"sequence - count %d\n", bus, count);
/* 1. using the Page Migration Control reg set SoftStop */
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "1a. read 0x%x [LE] from %p\n", val, target);
val |= PMR_SOFTSTOP;
printk(KERN_DEBUG "1b. writing 0x%x [LE] to %p\n", val, target);
writel(cpu_to_be32(val), target);
/* 2. poll split queues until all DMA activity is done */
printk(KERN_DEBUG "2a. starting to poll split queues\n");
target = calgary_reg(bbar, split_queue_offset(bus));
do {
val64 = readq(target);
i++;
} while ((val64 & 0xff) != 0xff && i < 100);
if (i == 100)
pr_warn("CalIOC2: PCI bus not quiesced, continuing anyway\n");
/* 3. poll Page Migration DEBUG for SoftStopFault */
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "3. read 0x%x [LE] from %p\n", val, target);
/* 4. if SoftStopFault - goto (1) */
if (val & PMR_SOFTSTOPFAULT) {
if (++count < 100)
goto begin;
else {
pr_warn("CalIOC2: too many SoftStopFaults, aborting TCE cache flush sequence!\n");
return; /* pray for the best */
}
}
/* 5. Slam into HardStop by reading PHB_PAGE_MIG_CTRL */
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
printk(KERN_DEBUG "5a. slamming into HardStop by reading %p\n", target);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "5b. read 0x%x [LE] from %p\n", val, target);
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_DEBUG);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "5c. read 0x%x [LE] from %p (debug)\n", val, target);
/* 6. invalidate TCE cache */
printk(KERN_DEBUG "6. invalidating TCE cache\n");
target = calgary_reg(bbar, tar_offset(bus));
writeq(tbl->tar_val, target);
/* 7. Re-read PMCR */
printk(KERN_DEBUG "7a. Re-reading PMCR\n");
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "7b. read 0x%x [LE] from %p\n", val, target);
/* 8. Remove HardStop */
printk(KERN_DEBUG "8a. removing HardStop from PMCR\n");
target = calgary_reg(bbar, phb_offset(bus) | PHB_PAGE_MIG_CTRL);
val = 0;
printk(KERN_DEBUG "8b. writing 0x%x [LE] to %p\n", val, target);
writel(cpu_to_be32(val), target);
val = be32_to_cpu(readl(target));
printk(KERN_DEBUG "8c. read 0x%x [LE] from %p\n", val, target);
}
static void __init calgary_reserve_mem_region(struct pci_dev *dev, u64 start,
u64 limit)
{
unsigned int numpages;
limit = limit | 0xfffff;
limit++;
numpages = ((limit - start) >> PAGE_SHIFT);
iommu_range_reserve(pci_iommu(dev->bus), start, numpages);
}
static void __init calgary_reserve_peripheral_mem_1(struct pci_dev *dev)
{
void __iomem *target;
u64 low, high, sizelow;
u64 start, limit;
struct iommu_table *tbl = pci_iommu(dev->bus);
unsigned char busnum = dev->bus->number;
void __iomem *bbar = tbl->bbar;
/* peripheral MEM_1 region */
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_LOW);
low = be32_to_cpu(readl(target));
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_HIGH);
high = be32_to_cpu(readl(target));
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_1_SIZE);
sizelow = be32_to_cpu(readl(target));
start = (high << 32) | low;
limit = sizelow;
calgary_reserve_mem_region(dev, start, limit);
}
static void __init calgary_reserve_peripheral_mem_2(struct pci_dev *dev)
{
void __iomem *target;
u32 val32;
u64 low, high, sizelow, sizehigh;
u64 start, limit;
struct iommu_table *tbl = pci_iommu(dev->bus);
unsigned char busnum = dev->bus->number;
void __iomem *bbar = tbl->bbar;
/* is it enabled? */
target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
val32 = be32_to_cpu(readl(target));
if (!(val32 & PHB_MEM2_ENABLE))
return;
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_LOW);
low = be32_to_cpu(readl(target));
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_HIGH);
high = be32_to_cpu(readl(target));
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_LOW);
sizelow = be32_to_cpu(readl(target));
target = calgary_reg(bbar, phb_offset(busnum) | PHB_MEM_2_SIZE_HIGH);
sizehigh = be32_to_cpu(readl(target));
start = (high << 32) | low;
limit = (sizehigh << 32) | sizelow;
calgary_reserve_mem_region(dev, start, limit);
}
/*
* some regions of the IO address space do not get translated, so we
* must not give devices IO addresses in those regions. The regions
* are the 640KB-1MB region and the two PCI peripheral memory holes.
* Reserve all of them in the IOMMU bitmap to avoid giving them out
* later.
*/
static void __init calgary_reserve_regions(struct pci_dev *dev)
{
unsigned int npages;
u64 start;
struct iommu_table *tbl = pci_iommu(dev->bus);
/* reserve EMERGENCY_PAGES from bad_dma_address and up */
iommu_range_reserve(tbl, DMA_ERROR_CODE, EMERGENCY_PAGES);
/* avoid the BIOS/VGA first 640KB-1MB region */
/* for CalIOC2 - avoid the entire first MB */
if (is_calgary(dev->device)) {
start = (640 * 1024);
npages = ((1024 - 640) * 1024) >> PAGE_SHIFT;
} else { /* calioc2 */
start = 0;
npages = (1 * 1024 * 1024) >> PAGE_SHIFT;
}
iommu_range_reserve(tbl, start, npages);
/* reserve the two PCI peripheral memory regions in IO space */
calgary_reserve_peripheral_mem_1(dev);
calgary_reserve_peripheral_mem_2(dev);
}
static int __init calgary_setup_tar(struct pci_dev *dev, void __iomem *bbar)
{
u64 val64;
u64 table_phys;
void __iomem *target;
int ret;
struct iommu_table *tbl;
/* build TCE tables for each PHB */
ret = build_tce_table(dev, bbar);
if (ret)
return ret;
tbl = pci_iommu(dev->bus);
tbl->it_base = (unsigned long)bus_info[dev->bus->number].tce_space;
if (is_kdump_kernel())
calgary_init_bitmap_from_tce_table(tbl);
else
tce_free(tbl, 0, tbl->it_size);
if (is_calgary(dev->device))
tbl->chip_ops = &calgary_chip_ops;
else if (is_calioc2(dev->device))
tbl->chip_ops = &calioc2_chip_ops;
else
BUG();
calgary_reserve_regions(dev);
/* set TARs for each PHB */
target = calgary_reg(bbar, tar_offset(dev->bus->number));
val64 = be64_to_cpu(readq(target));
/* zero out all TAR bits under sw control */
val64 &= ~TAR_SW_BITS;
table_phys = (u64)__pa(tbl->it_base);
val64 |= table_phys;
BUG_ON(specified_table_size > TCE_TABLE_SIZE_8M);
val64 |= (u64) specified_table_size;
tbl->tar_val = cpu_to_be64(val64);
writeq(tbl->tar_val, target);
readq(target); /* flush */
return 0;
}
static void __init calgary_free_bus(struct pci_dev *dev)
{
u64 val64;
struct iommu_table *tbl = pci_iommu(dev->bus);
void __iomem *target;
unsigned int bitmapsz;
target = calgary_reg(tbl->bbar, tar_offset(dev->bus->number));
val64 = be64_to_cpu(readq(target));
val64 &= ~TAR_SW_BITS;
writeq(cpu_to_be64(val64), target);
readq(target); /* flush */
bitmapsz = tbl->it_size / BITS_PER_BYTE;
free_pages((unsigned long)tbl->it_map, get_order(bitmapsz));
tbl->it_map = NULL;
kfree(tbl);
set_pci_iommu(dev->bus, NULL);
/* Can't free bootmem allocated memory after system is up :-( */
bus_info[dev->bus->number].tce_space = NULL;
}
static void calgary_dump_error_regs(struct iommu_table *tbl)
{
void __iomem *bbar = tbl->bbar;
void __iomem *target;
u32 csr, plssr;
target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
csr = be32_to_cpu(readl(target));
target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_PLSSR_OFFSET);
plssr = be32_to_cpu(readl(target));
/* If no error, the agent ID in the CSR is not valid */
pr_emerg("DMA error on Calgary PHB 0x%x, 0x%08x@CSR 0x%08x@PLSSR\n",
tbl->it_busno, csr, plssr);
}
static void calioc2_dump_error_regs(struct iommu_table *tbl)
{
void __iomem *bbar = tbl->bbar;
u32 csr, csmr, plssr, mck, rcstat;
void __iomem *target;
unsigned long phboff = phb_offset(tbl->it_busno);
unsigned long erroff;
u32 errregs[7];
int i;
/* dump CSR */
target = calgary_reg(bbar, phboff | PHB_CSR_OFFSET);
csr = be32_to_cpu(readl(target));
/* dump PLSSR */
target = calgary_reg(bbar, phboff | PHB_PLSSR_OFFSET);
plssr = be32_to_cpu(readl(target));
/* dump CSMR */
target = calgary_reg(bbar, phboff | 0x290);
csmr = be32_to_cpu(readl(target));
/* dump mck */
target = calgary_reg(bbar, phboff | 0x800);
mck = be32_to_cpu(readl(target));
pr_emerg("DMA error on CalIOC2 PHB 0x%x\n", tbl->it_busno);
pr_emerg("0x%08x@CSR 0x%08x@PLSSR 0x%08x@CSMR 0x%08x@MCK\n",
csr, plssr, csmr, mck);
/* dump rest of error regs */
pr_emerg("");
for (i = 0; i < ARRAY_SIZE(errregs); i++) {
/* err regs are at 0x810 - 0x870 */
erroff = (0x810 + (i * 0x10));
target = calgary_reg(bbar, phboff | erroff);
errregs[i] = be32_to_cpu(readl(target));
pr_cont("0x%08x@0x%lx ", errregs[i], erroff);
}
pr_cont("\n");
/* root complex status */
target = calgary_reg(bbar, phboff | PHB_ROOT_COMPLEX_STATUS);
rcstat = be32_to_cpu(readl(target));
printk(KERN_EMERG "Calgary: 0x%08x@0x%x\n", rcstat,
PHB_ROOT_COMPLEX_STATUS);
}
static void calgary_watchdog(unsigned long data)
{
struct pci_dev *dev = (struct pci_dev *)data;
struct iommu_table *tbl = pci_iommu(dev->bus);
void __iomem *bbar = tbl->bbar;
u32 val32;
void __iomem *target;
target = calgary_reg(bbar, phb_offset(tbl->it_busno) | PHB_CSR_OFFSET);
val32 = be32_to_cpu(readl(target));
/* If no error, the agent ID in the CSR is not valid */
if (val32 & CSR_AGENT_MASK) {
tbl->chip_ops->dump_error_regs(tbl);
/* reset error */
writel(0, target);
/* Disable bus that caused the error */
target = calgary_reg(bbar, phb_offset(tbl->it_busno) |
PHB_CONFIG_RW_OFFSET);
val32 = be32_to_cpu(readl(target));
val32 |= PHB_SLOT_DISABLE;
writel(cpu_to_be32(val32), target);
readl(target); /* flush */
} else {
/* Reset the timer */
mod_timer(&tbl->watchdog_timer, jiffies + 2 * HZ);
}
}
static void __init calgary_set_split_completion_timeout(void __iomem *bbar,
unsigned char busnum, unsigned long timeout)
{
u64 val64;
void __iomem *target;
unsigned int phb_shift = ~0; /* silence gcc */
u64 mask;
switch (busno_to_phbid(busnum)) {
case 0: phb_shift = (63 - 19);
break;
case 1: phb_shift = (63 - 23);
break;
case 2: phb_shift = (63 - 27);
break;
case 3: phb_shift = (63 - 35);
break;
default:
BUG_ON(busno_to_phbid(busnum));
}
target = calgary_reg(bbar, CALGARY_CONFIG_REG);
val64 = be64_to_cpu(readq(target));
/* zero out this PHB's timer bits */
mask = ~(0xFUL << phb_shift);
val64 &= mask;
val64 |= (timeout << phb_shift);
writeq(cpu_to_be64(val64), target);
readq(target); /* flush */
}
static void __init calioc2_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
{
unsigned char busnum = dev->bus->number;
void __iomem *bbar = tbl->bbar;
void __iomem *target;
u32 val;
/*
* CalIOC2 designers recommend setting bit 8 in 0xnDB0 to 1
*/
target = calgary_reg(bbar, phb_offset(busnum) | PHB_SAVIOR_L2);
val = cpu_to_be32(readl(target));
val |= 0x00800000;
writel(cpu_to_be32(val), target);
}
static void __init calgary_handle_quirks(struct iommu_table *tbl, struct pci_dev *dev)
{
unsigned char busnum = dev->bus->number;
/*
* Give split completion a longer timeout on bus 1 for aic94xx
* http://bugzilla.kernel.org/show_bug.cgi?id=7180
*/
if (is_calgary(dev->device) && (busnum == 1))
calgary_set_split_completion_timeout(tbl->bbar, busnum,
CCR_2SEC_TIMEOUT);
}
static void __init calgary_enable_translation(struct pci_dev *dev)
{
u32 val32;
unsigned char busnum;
void __iomem *target;
void __iomem *bbar;
struct iommu_table *tbl;
busnum = dev->bus->number;
tbl = pci_iommu(dev->bus);
bbar = tbl->bbar;
/* enable TCE in PHB Config Register */
target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
val32 = be32_to_cpu(readl(target));
val32 |= PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE;
printk(KERN_INFO "Calgary: enabling translation on %s PHB %#x\n",
(dev->device == PCI_DEVICE_ID_IBM_CALGARY) ?
"Calgary" : "CalIOC2", busnum);
printk(KERN_INFO "Calgary: errant DMAs will now be prevented on this "
"bus.\n");
writel(cpu_to_be32(val32), target);
readl(target); /* flush */
init_timer(&tbl->watchdog_timer);
tbl->watchdog_timer.function = &calgary_watchdog;
tbl->watchdog_timer.data = (unsigned long)dev;
mod_timer(&tbl->watchdog_timer, jiffies);
}
static void __init calgary_disable_translation(struct pci_dev *dev)
{
u32 val32;
unsigned char busnum;
void __iomem *target;
void __iomem *bbar;
struct iommu_table *tbl;
busnum = dev->bus->number;
tbl = pci_iommu(dev->bus);
bbar = tbl->bbar;
/* disable TCE in PHB Config Register */
target = calgary_reg(bbar, phb_offset(busnum) | PHB_CONFIG_RW_OFFSET);
val32 = be32_to_cpu(readl(target));
val32 &= ~(PHB_TCE_ENABLE | PHB_DAC_DISABLE | PHB_MCSR_ENABLE);
printk(KERN_INFO "Calgary: disabling translation on PHB %#x!\n", busnum);
writel(cpu_to_be32(val32), target);
readl(target); /* flush */
del_timer_sync(&tbl->watchdog_timer);
}
static void __init calgary_init_one_nontraslated(struct pci_dev *dev)
{
pci_dev_get(dev);
set_pci_iommu(dev->bus, NULL);
/* is the device behind a bridge? */
if (dev->bus->parent)
dev->bus->parent->self = dev;
else
dev->bus->self = dev;
}
static int __init calgary_init_one(struct pci_dev *dev)
{
void __iomem *bbar;
struct iommu_table *tbl;
int ret;
bbar = busno_to_bbar(dev->bus->number);
ret = calgary_setup_tar(dev, bbar);
if (ret)
goto done;
pci_dev_get(dev);
if (dev->bus->parent) {
if (dev->bus->parent->self)
printk(KERN_WARNING "Calgary: IEEEE, dev %p has "
"bus->parent->self!\n", dev);
dev->bus->parent->self = dev;
} else
dev->bus->self = dev;
tbl = pci_iommu(dev->bus);
tbl->chip_ops->handle_quirks(tbl, dev);
calgary_enable_translation(dev);
return 0;
done:
return ret;
}
static int __init calgary_locate_bbars(void)
{
int ret;
int rioidx, phb, bus;
void __iomem *bbar;
void __iomem *target;
unsigned long offset;
u8 start_bus, end_bus;
u32 val;
ret = -ENODATA;
for (rioidx = 0; rioidx < rio_table_hdr->num_rio_dev; rioidx++) {
struct rio_detail *rio = rio_devs[rioidx];
if ((rio->type != COMPAT_CALGARY) && (rio->type != ALT_CALGARY))
continue;
/* map entire 1MB of Calgary config space */
bbar = ioremap_nocache(rio->BBAR, 1024 * 1024);
if (!bbar)
goto error;
for (phb = 0; phb < PHBS_PER_CALGARY; phb++) {
offset = phb_debug_offsets[phb] | PHB_DEBUG_STUFF_OFFSET;
target = calgary_reg(bbar, offset);
val = be32_to_cpu(readl(target));
start_bus = (u8)((val & 0x00FF0000) >> 16);
end_bus = (u8)((val & 0x0000FF00) >> 8);
if (end_bus) {
for (bus = start_bus; bus <= end_bus; bus++) {
bus_info[bus].bbar = bbar;
bus_info[bus].phbid = phb;
}
} else {
bus_info[start_bus].bbar = bbar;
bus_info[start_bus].phbid = phb;
}
}
}
return 0;
error:
/* scan bus_info and iounmap any bbars we previously ioremap'd */
for (bus = 0; bus < ARRAY_SIZE(bus_info); bus++)
if (bus_info[bus].bbar)
iounmap(bus_info[bus].bbar);
return ret;
}
static int __init calgary_init(void)
{
int ret;
struct pci_dev *dev = NULL;
struct calgary_bus_info *info;
ret = calgary_locate_bbars();
if (ret)
return ret;
/* Purely for kdump kernel case */
if (is_kdump_kernel())
get_tce_space_from_tar();
do {
dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
if (!dev)
break;
if (!is_cal_pci_dev(dev->device))
continue;
info = &bus_info[dev->bus->number];
if (info->translation_disabled) {
calgary_init_one_nontraslated(dev);
continue;
}
if (!info->tce_space && !translate_empty_slots)
continue;
ret = calgary_init_one(dev);
if (ret)
goto error;
} while (1);
dev = NULL;
for_each_pci_dev(dev) {
struct iommu_table *tbl;
tbl = find_iommu_table(&dev->dev);
if (translation_enabled(tbl))
dev->dev.archdata.dma_ops = &calgary_dma_ops;
}
return ret;
error:
do {
dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
if (!dev)
break;
if (!is_cal_pci_dev(dev->device))
continue;
info = &bus_info[dev->bus->number];
if (info->translation_disabled) {
pci_dev_put(dev);
continue;
}
if (!info->tce_space && !translate_empty_slots)
continue;
calgary_disable_translation(dev);
calgary_free_bus(dev);
pci_dev_put(dev); /* Undo calgary_init_one()'s pci_dev_get() */
dev->dev.archdata.dma_ops = NULL;
} while (1);
return ret;
}
static inline int __init determine_tce_table_size(void)
{
int ret;
if (specified_table_size != TCE_TABLE_SIZE_UNSPECIFIED)
return specified_table_size;
if (is_kdump_kernel() && saved_max_pfn) {
/*
* Table sizes are from 0 to 7 (TCE_TABLE_SIZE_64K to
* TCE_TABLE_SIZE_8M). Table size 0 has 8K entries and each
* larger table size has twice as many entries, so shift the
* max ram address by 13 to divide by 8K and then look at the
* order of the result to choose between 0-7.
*/
ret = get_order((saved_max_pfn * PAGE_SIZE) >> 13);
if (ret > TCE_TABLE_SIZE_8M)
ret = TCE_TABLE_SIZE_8M;
} else {
/*
* Use 8M by default (suggested by Muli) if it's not
* kdump kernel and saved_max_pfn isn't set.
*/
ret = TCE_TABLE_SIZE_8M;
}
return ret;
}
static int __init build_detail_arrays(void)
{
unsigned long ptr;
unsigned numnodes, i;
int scal_detail_size, rio_detail_size;
numnodes = rio_table_hdr->num_scal_dev;
if (numnodes > MAX_NUMNODES){
printk(KERN_WARNING
"Calgary: MAX_NUMNODES too low! Defined as %d, "
"but system has %d nodes.\n",
MAX_NUMNODES, numnodes);
return -ENODEV;
}
switch (rio_table_hdr->version){
case 2:
scal_detail_size = 11;
rio_detail_size = 13;
break;
case 3:
scal_detail_size = 12;
rio_detail_size = 15;
break;
default:
printk(KERN_WARNING
"Calgary: Invalid Rio Grande Table Version: %d\n",
rio_table_hdr->version);
return -EPROTO;
}
ptr = ((unsigned long)rio_table_hdr) + 3;
for (i = 0; i < numnodes; i++, ptr += scal_detail_size)
scal_devs[i] = (struct scal_detail *)ptr;
for (i = 0; i < rio_table_hdr->num_rio_dev;
i++, ptr += rio_detail_size)
rio_devs[i] = (struct rio_detail *)ptr;
return 0;
}
static int __init calgary_bus_has_devices(int bus, unsigned short pci_dev)
{
int dev;
u32 val;
if (pci_dev == PCI_DEVICE_ID_IBM_CALIOC2) {
/*
* FIXME: properly scan for devices across the
* PCI-to-PCI bridge on every CalIOC2 port.
*/
return 1;
}
for (dev = 1; dev < 8; dev++) {
val = read_pci_config(bus, dev, 0, 0);
if (val != 0xffffffff)
break;
}
return (val != 0xffffffff);
}
/*
* calgary_init_bitmap_from_tce_table():
* Function for kdump case. In the second/kdump kernel initialize
* the bitmap based on the tce table entries obtained from first kernel
*/
static void calgary_init_bitmap_from_tce_table(struct iommu_table *tbl)
{
u64 *tp;
unsigned int index;
tp = ((u64 *)tbl->it_base);
for (index = 0 ; index < tbl->it_size; index++) {
if (*tp != 0x0)
set_bit(index, tbl->it_map);
tp++;
}
}
/*
* get_tce_space_from_tar():
* Function for kdump case. Get the tce tables from first kernel
* by reading the contents of the base address register of calgary iommu
*/
static void __init get_tce_space_from_tar(void)
{
int bus;
void __iomem *target;
unsigned long tce_space;
for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
struct calgary_bus_info *info = &bus_info[bus];
unsigned short pci_device;
u32 val;
val = read_pci_config(bus, 0, 0, 0);
pci_device = (val & 0xFFFF0000) >> 16;
if (!is_cal_pci_dev(pci_device))
continue;
if (info->translation_disabled)
continue;
if (calgary_bus_has_devices(bus, pci_device) ||
translate_empty_slots) {
target = calgary_reg(bus_info[bus].bbar,
tar_offset(bus));
tce_space = be64_to_cpu(readq(target));
tce_space = tce_space & TAR_SW_BITS;
tce_space = tce_space & (~specified_table_size);
info->tce_space = (u64 *)__va(tce_space);
}
}
return;
}
static int __init calgary_iommu_init(void)
{
int ret;
/* ok, we're trying to use Calgary - let's roll */
printk(KERN_INFO "PCI-DMA: Using Calgary IOMMU\n");
ret = calgary_init();
if (ret) {
printk(KERN_ERR "PCI-DMA: Calgary init failed %d, "
"falling back to no_iommu\n", ret);
return ret;
}
return 0;
}
int __init detect_calgary(void)
{
int bus;
void *tbl;
int calgary_found = 0;
unsigned long ptr;
unsigned int offset, prev_offset;
int ret;
/*
* if the user specified iommu=off or iommu=soft or we found
* another HW IOMMU already, bail out.
*/
if (no_iommu || iommu_detected)
return -ENODEV;
if (!use_calgary)
return -ENODEV;
if (!early_pci_allowed())
return -ENODEV;
printk(KERN_DEBUG "Calgary: detecting Calgary via BIOS EBDA area\n");
ptr = (unsigned long)phys_to_virt(get_bios_ebda());
rio_table_hdr = NULL;
prev_offset = 0;
offset = 0x180;
/*
* The next offset is stored in the 1st word.
* Only parse up until the offset increases:
*/
while (offset > prev_offset) {
/* The block id is stored in the 2nd word */
if (*((unsigned short *)(ptr + offset + 2)) == 0x4752){
/* set the pointer past the offset & block id */
rio_table_hdr = (struct rio_table_hdr *)(ptr + offset + 4);
break;
}
prev_offset = offset;
offset = *((unsigned short *)(ptr + offset));
}
if (!rio_table_hdr) {
printk(KERN_DEBUG "Calgary: Unable to locate Rio Grande table "
"in EBDA - bailing!\n");
return -ENODEV;
}
ret = build_detail_arrays();
if (ret) {
printk(KERN_DEBUG "Calgary: build_detail_arrays ret %d\n", ret);
return -ENOMEM;
}
specified_table_size = determine_tce_table_size();
for (bus = 0; bus < MAX_PHB_BUS_NUM; bus++) {
struct calgary_bus_info *info = &bus_info[bus];
unsigned short pci_device;
u32 val;
val = read_pci_config(bus, 0, 0, 0);
pci_device = (val & 0xFFFF0000) >> 16;
if (!is_cal_pci_dev(pci_device))
continue;
if (info->translation_disabled)
continue;
if (calgary_bus_has_devices(bus, pci_device) ||
translate_empty_slots) {
/*
* If it is kdump kernel, find and use tce tables
* from first kernel, else allocate tce tables here
*/
if (!is_kdump_kernel()) {
tbl = alloc_tce_table();
if (!tbl)
goto cleanup;
info->tce_space = tbl;
}
calgary_found = 1;
}
}
printk(KERN_DEBUG "Calgary: finished detection, Calgary %s\n",
calgary_found ? "found" : "not found");
if (calgary_found) {
iommu_detected = 1;
calgary_detected = 1;
printk(KERN_INFO "PCI-DMA: Calgary IOMMU detected.\n");
printk(KERN_INFO "PCI-DMA: Calgary TCE table spec is %d\n",
specified_table_size);
x86_init.iommu.iommu_init = calgary_iommu_init;
}
return calgary_found;
cleanup:
for (--bus; bus >= 0; --bus) {
struct calgary_bus_info *info = &bus_info[bus];
if (info->tce_space)
free_tce_table(info->tce_space);
}
return -ENOMEM;
}
static int __init calgary_parse_options(char *p)
{
unsigned int bridge;
unsigned long val;
size_t len;
ssize_t ret;
while (*p) {
if (!strncmp(p, "64k", 3))
specified_table_size = TCE_TABLE_SIZE_64K;
else if (!strncmp(p, "128k", 4))
specified_table_size = TCE_TABLE_SIZE_128K;
else if (!strncmp(p, "256k", 4))
specified_table_size = TCE_TABLE_SIZE_256K;
else if (!strncmp(p, "512k", 4))
specified_table_size = TCE_TABLE_SIZE_512K;
else if (!strncmp(p, "1M", 2))
specified_table_size = TCE_TABLE_SIZE_1M;
else if (!strncmp(p, "2M", 2))
specified_table_size = TCE_TABLE_SIZE_2M;
else if (!strncmp(p, "4M", 2))
specified_table_size = TCE_TABLE_SIZE_4M;
else if (!strncmp(p, "8M", 2))
specified_table_size = TCE_TABLE_SIZE_8M;
len = strlen("translate_empty_slots");
if (!strncmp(p, "translate_empty_slots", len))
translate_empty_slots = 1;
len = strlen("disable");
if (!strncmp(p, "disable", len)) {
p += len;
if (*p == '=')
++p;
if (*p == '\0')
break;
ret = kstrtoul(p, 0, &val);
if (ret)
break;
bridge = val;
if (bridge < MAX_PHB_BUS_NUM) {
printk(KERN_INFO "Calgary: disabling "
"translation for PHB %#x\n", bridge);
bus_info[bridge].translation_disabled = 1;
}
}
p = strpbrk(p, ",");
if (!p)
break;
p++; /* skip ',' */
}
return 1;
}
__setup("calgary=", calgary_parse_options);
static void __init calgary_fixup_one_tce_space(struct pci_dev *dev)
{
struct iommu_table *tbl;
unsigned int npages;
int i;
tbl = pci_iommu(dev->bus);
for (i = 0; i < 4; i++) {
struct resource *r = &dev->resource[PCI_BRIDGE_RESOURCES + i];
/* Don't give out TCEs that map MEM resources */
if (!(r->flags & IORESOURCE_MEM))
continue;
/* 0-based? we reserve the whole 1st MB anyway */
if (!r->start)
continue;
/* cover the whole region */
npages = resource_size(r) >> PAGE_SHIFT;
npages++;
iommu_range_reserve(tbl, r->start, npages);
}
}
static int __init calgary_fixup_tce_spaces(void)
{
struct pci_dev *dev = NULL;
struct calgary_bus_info *info;
if (no_iommu || swiotlb || !calgary_detected)
return -ENODEV;
printk(KERN_DEBUG "Calgary: fixing up tce spaces\n");
do {
dev = pci_get_device(PCI_VENDOR_ID_IBM, PCI_ANY_ID, dev);
if (!dev)
break;
if (!is_cal_pci_dev(dev->device))
continue;
info = &bus_info[dev->bus->number];
if (info->translation_disabled)
continue;
if (!info->tce_space)
continue;
calgary_fixup_one_tce_space(dev);
} while (1);
return 0;
}
/*
* We need to be call after pcibios_assign_resources (fs_initcall level)
* and before device_initcall.
*/
rootfs_initcall(calgary_fixup_tce_spaces);
IOMMU_INIT_POST(detect_calgary);
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