![Huang Ying](/assets/img/avatar_default.png)
On one of our testing machine, the following EINJ command lines: # echo 0x10000000 > param1 # echo 0xfffffffffffff000 > param2 # echo 0x8 > error_type # echo 1 > error_inject Will get: echo: write error: Input/output error The EIO comes from: rc = apei_exec_pre_map_gars(&trigger_ctx); The root cause is as follow. Normally, ACPI atomic IO support is used to access IO memory. But in EINJ of that machine, it is used to access RAM to trigger the injected error. And the ioremap() called by apei_exec_pre_map_gars() can not map the RAM. This patch add RAM mapping support to ACPI atomic IO support to satisfy EINJ requirement. Signed-off-by: Huang Ying <ying.huang@intel.com> Tested-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
423 lines
9.4 KiB
C
423 lines
9.4 KiB
C
/*
|
|
* atomicio.c - ACPI IO memory pre-mapping/post-unmapping, then
|
|
* accessing in atomic context.
|
|
*
|
|
* This is used for NMI handler to access IO memory area, because
|
|
* ioremap/iounmap can not be used in NMI handler. The IO memory area
|
|
* is pre-mapped in process context and accessed in NMI handler.
|
|
*
|
|
* Copyright (C) 2009-2010, Intel Corp.
|
|
* Author: Huang Ying <ying.huang@intel.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License version
|
|
* 2 as published by the Free Software Foundation.
|
|
*
|
|
* 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/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/init.h>
|
|
#include <linux/acpi.h>
|
|
#include <linux/io.h>
|
|
#include <linux/kref.h>
|
|
#include <linux/rculist.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/highmem.h>
|
|
#include <acpi/atomicio.h>
|
|
|
|
#define ACPI_PFX "ACPI: "
|
|
|
|
static LIST_HEAD(acpi_iomaps);
|
|
/*
|
|
* Used for mutual exclusion between writers of acpi_iomaps list, for
|
|
* synchronization between readers and writer, RCU is used.
|
|
*/
|
|
static DEFINE_SPINLOCK(acpi_iomaps_lock);
|
|
|
|
struct acpi_iomap {
|
|
struct list_head list;
|
|
void __iomem *vaddr;
|
|
unsigned long size;
|
|
phys_addr_t paddr;
|
|
struct kref ref;
|
|
};
|
|
|
|
/* acpi_iomaps_lock or RCU read lock must be held before calling */
|
|
static struct acpi_iomap *__acpi_find_iomap(phys_addr_t paddr,
|
|
unsigned long size)
|
|
{
|
|
struct acpi_iomap *map;
|
|
|
|
list_for_each_entry_rcu(map, &acpi_iomaps, list) {
|
|
if (map->paddr + map->size >= paddr + size &&
|
|
map->paddr <= paddr)
|
|
return map;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Atomic "ioremap" used by NMI handler, if the specified IO memory
|
|
* area is not pre-mapped, NULL will be returned.
|
|
*
|
|
* acpi_iomaps_lock or RCU read lock must be held before calling
|
|
*/
|
|
static void __iomem *__acpi_ioremap_fast(phys_addr_t paddr,
|
|
unsigned long size)
|
|
{
|
|
struct acpi_iomap *map;
|
|
|
|
map = __acpi_find_iomap(paddr, size/8);
|
|
if (map)
|
|
return map->vaddr + (paddr - map->paddr);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
/* acpi_iomaps_lock must be held before calling */
|
|
static void __iomem *__acpi_try_ioremap(phys_addr_t paddr,
|
|
unsigned long size)
|
|
{
|
|
struct acpi_iomap *map;
|
|
|
|
map = __acpi_find_iomap(paddr, size);
|
|
if (map) {
|
|
kref_get(&map->ref);
|
|
return map->vaddr + (paddr - map->paddr);
|
|
} else
|
|
return NULL;
|
|
}
|
|
|
|
#ifndef CONFIG_IA64
|
|
#define should_use_kmap(pfn) page_is_ram(pfn)
|
|
#else
|
|
/* ioremap will take care of cache attributes */
|
|
#define should_use_kmap(pfn) 0
|
|
#endif
|
|
|
|
static void __iomem *acpi_map(phys_addr_t pg_off, unsigned long pg_sz)
|
|
{
|
|
unsigned long pfn;
|
|
|
|
pfn = pg_off >> PAGE_SHIFT;
|
|
if (should_use_kmap(pfn)) {
|
|
if (pg_sz > PAGE_SIZE)
|
|
return NULL;
|
|
return (void __iomem __force *)kmap(pfn_to_page(pfn));
|
|
} else
|
|
return ioremap(pg_off, pg_sz);
|
|
}
|
|
|
|
static void acpi_unmap(phys_addr_t pg_off, void __iomem *vaddr)
|
|
{
|
|
unsigned long pfn;
|
|
|
|
pfn = pg_off >> PAGE_SHIFT;
|
|
if (page_is_ram(pfn))
|
|
kunmap(pfn_to_page(pfn));
|
|
else
|
|
iounmap(vaddr);
|
|
}
|
|
|
|
/*
|
|
* Used to pre-map the specified IO memory area. First try to find
|
|
* whether the area is already pre-mapped, if it is, increase the
|
|
* reference count (in __acpi_try_ioremap) and return; otherwise, do
|
|
* the real ioremap, and add the mapping into acpi_iomaps list.
|
|
*/
|
|
static void __iomem *acpi_pre_map(phys_addr_t paddr,
|
|
unsigned long size)
|
|
{
|
|
void __iomem *vaddr;
|
|
struct acpi_iomap *map;
|
|
unsigned long pg_sz, flags;
|
|
phys_addr_t pg_off;
|
|
|
|
spin_lock_irqsave(&acpi_iomaps_lock, flags);
|
|
vaddr = __acpi_try_ioremap(paddr, size);
|
|
spin_unlock_irqrestore(&acpi_iomaps_lock, flags);
|
|
if (vaddr)
|
|
return vaddr;
|
|
|
|
pg_off = paddr & PAGE_MASK;
|
|
pg_sz = ((paddr + size + PAGE_SIZE - 1) & PAGE_MASK) - pg_off;
|
|
vaddr = acpi_map(pg_off, pg_sz);
|
|
if (!vaddr)
|
|
return NULL;
|
|
map = kmalloc(sizeof(*map), GFP_KERNEL);
|
|
if (!map)
|
|
goto err_unmap;
|
|
INIT_LIST_HEAD(&map->list);
|
|
map->paddr = pg_off;
|
|
map->size = pg_sz;
|
|
map->vaddr = vaddr;
|
|
kref_init(&map->ref);
|
|
|
|
spin_lock_irqsave(&acpi_iomaps_lock, flags);
|
|
vaddr = __acpi_try_ioremap(paddr, size);
|
|
if (vaddr) {
|
|
spin_unlock_irqrestore(&acpi_iomaps_lock, flags);
|
|
acpi_unmap(pg_off, map->vaddr);
|
|
kfree(map);
|
|
return vaddr;
|
|
}
|
|
list_add_tail_rcu(&map->list, &acpi_iomaps);
|
|
spin_unlock_irqrestore(&acpi_iomaps_lock, flags);
|
|
|
|
return map->vaddr + (paddr - map->paddr);
|
|
err_unmap:
|
|
acpi_unmap(pg_off, vaddr);
|
|
return NULL;
|
|
}
|
|
|
|
/* acpi_iomaps_lock must be held before calling */
|
|
static void __acpi_kref_del_iomap(struct kref *ref)
|
|
{
|
|
struct acpi_iomap *map;
|
|
|
|
map = container_of(ref, struct acpi_iomap, ref);
|
|
list_del_rcu(&map->list);
|
|
}
|
|
|
|
/*
|
|
* Used to post-unmap the specified IO memory area. The iounmap is
|
|
* done only if the reference count goes zero.
|
|
*/
|
|
static void acpi_post_unmap(phys_addr_t paddr, unsigned long size)
|
|
{
|
|
struct acpi_iomap *map;
|
|
unsigned long flags;
|
|
int del;
|
|
|
|
spin_lock_irqsave(&acpi_iomaps_lock, flags);
|
|
map = __acpi_find_iomap(paddr, size);
|
|
BUG_ON(!map);
|
|
del = kref_put(&map->ref, __acpi_kref_del_iomap);
|
|
spin_unlock_irqrestore(&acpi_iomaps_lock, flags);
|
|
|
|
if (!del)
|
|
return;
|
|
|
|
synchronize_rcu();
|
|
acpi_unmap(map->paddr, map->vaddr);
|
|
kfree(map);
|
|
}
|
|
|
|
/* In NMI handler, should set silent = 1 */
|
|
static int acpi_check_gar(struct acpi_generic_address *reg,
|
|
u64 *paddr, int silent)
|
|
{
|
|
u32 width, space_id;
|
|
|
|
width = reg->bit_width;
|
|
space_id = reg->space_id;
|
|
/* Handle possible alignment issues */
|
|
memcpy(paddr, ®->address, sizeof(*paddr));
|
|
if (!*paddr) {
|
|
if (!silent)
|
|
pr_warning(FW_BUG ACPI_PFX
|
|
"Invalid physical address in GAR [0x%llx/%u/%u]\n",
|
|
*paddr, width, space_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if ((width != 8) && (width != 16) && (width != 32) && (width != 64)) {
|
|
if (!silent)
|
|
pr_warning(FW_BUG ACPI_PFX
|
|
"Invalid bit width in GAR [0x%llx/%u/%u]\n",
|
|
*paddr, width, space_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY &&
|
|
space_id != ACPI_ADR_SPACE_SYSTEM_IO) {
|
|
if (!silent)
|
|
pr_warning(FW_BUG ACPI_PFX
|
|
"Invalid address space type in GAR [0x%llx/%u/%u]\n",
|
|
*paddr, width, space_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Pre-map, working on GAR */
|
|
int acpi_pre_map_gar(struct acpi_generic_address *reg)
|
|
{
|
|
u64 paddr;
|
|
void __iomem *vaddr;
|
|
int rc;
|
|
|
|
if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
|
|
return 0;
|
|
|
|
rc = acpi_check_gar(reg, &paddr, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
vaddr = acpi_pre_map(paddr, reg->bit_width / 8);
|
|
if (!vaddr)
|
|
return -EIO;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_pre_map_gar);
|
|
|
|
/* Post-unmap, working on GAR */
|
|
int acpi_post_unmap_gar(struct acpi_generic_address *reg)
|
|
{
|
|
u64 paddr;
|
|
int rc;
|
|
|
|
if (reg->space_id != ACPI_ADR_SPACE_SYSTEM_MEMORY)
|
|
return 0;
|
|
|
|
rc = acpi_check_gar(reg, &paddr, 0);
|
|
if (rc)
|
|
return rc;
|
|
|
|
acpi_post_unmap(paddr, reg->bit_width / 8);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_post_unmap_gar);
|
|
|
|
#ifdef readq
|
|
static inline u64 read64(const volatile void __iomem *addr)
|
|
{
|
|
return readq(addr);
|
|
}
|
|
#else
|
|
static inline u64 read64(const volatile void __iomem *addr)
|
|
{
|
|
u64 l, h;
|
|
l = readl(addr);
|
|
h = readl(addr+4);
|
|
return l | (h << 32);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Can be used in atomic (including NMI) or process context. RCU read
|
|
* lock can only be released after the IO memory area accessing.
|
|
*/
|
|
static int acpi_atomic_read_mem(u64 paddr, u64 *val, u32 width)
|
|
{
|
|
void __iomem *addr;
|
|
|
|
rcu_read_lock();
|
|
addr = __acpi_ioremap_fast(paddr, width);
|
|
switch (width) {
|
|
case 8:
|
|
*val = readb(addr);
|
|
break;
|
|
case 16:
|
|
*val = readw(addr);
|
|
break;
|
|
case 32:
|
|
*val = readl(addr);
|
|
break;
|
|
case 64:
|
|
*val = read64(addr);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef writeq
|
|
static inline void write64(u64 val, volatile void __iomem *addr)
|
|
{
|
|
writeq(val, addr);
|
|
}
|
|
#else
|
|
static inline void write64(u64 val, volatile void __iomem *addr)
|
|
{
|
|
writel(val, addr);
|
|
writel(val>>32, addr+4);
|
|
}
|
|
#endif
|
|
|
|
static int acpi_atomic_write_mem(u64 paddr, u64 val, u32 width)
|
|
{
|
|
void __iomem *addr;
|
|
|
|
rcu_read_lock();
|
|
addr = __acpi_ioremap_fast(paddr, width);
|
|
switch (width) {
|
|
case 8:
|
|
writeb(val, addr);
|
|
break;
|
|
case 16:
|
|
writew(val, addr);
|
|
break;
|
|
case 32:
|
|
writel(val, addr);
|
|
break;
|
|
case 64:
|
|
write64(val, addr);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* GAR accessing in atomic (including NMI) or process context */
|
|
int acpi_atomic_read(u64 *val, struct acpi_generic_address *reg)
|
|
{
|
|
u64 paddr;
|
|
int rc;
|
|
|
|
rc = acpi_check_gar(reg, &paddr, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
*val = 0;
|
|
switch (reg->space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
|
|
return acpi_atomic_read_mem(paddr, val, reg->bit_width);
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
return acpi_os_read_port(paddr, (u32 *)val, reg->bit_width);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_atomic_read);
|
|
|
|
int acpi_atomic_write(u64 val, struct acpi_generic_address *reg)
|
|
{
|
|
u64 paddr;
|
|
int rc;
|
|
|
|
rc = acpi_check_gar(reg, &paddr, 1);
|
|
if (rc)
|
|
return rc;
|
|
|
|
switch (reg->space_id) {
|
|
case ACPI_ADR_SPACE_SYSTEM_MEMORY:
|
|
return acpi_atomic_write_mem(paddr, val, reg->bit_width);
|
|
case ACPI_ADR_SPACE_SYSTEM_IO:
|
|
return acpi_os_write_port(paddr, val, reg->bit_width);
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(acpi_atomic_write);
|