linux/arch/arm/plat-omap/iommu.c
Tejun Heo 5a0e3ad6af include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files.  percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.

percpu.h -> slab.h dependency is about to be removed.  Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability.  As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.

  http://userweb.kernel.org/~tj/misc/slabh-sweep.py

The script does the followings.

* Scan files for gfp and slab usages and update includes such that
  only the necessary includes are there.  ie. if only gfp is used,
  gfp.h, if slab is used, slab.h.

* When the script inserts a new include, it looks at the include
  blocks and try to put the new include such that its order conforms
  to its surrounding.  It's put in the include block which contains
  core kernel includes, in the same order that the rest are ordered -
  alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
  doesn't seem to be any matching order.

* If the script can't find a place to put a new include (mostly
  because the file doesn't have fitting include block), it prints out
  an error message indicating which .h file needs to be added to the
  file.

The conversion was done in the following steps.

1. The initial automatic conversion of all .c files updated slightly
   over 4000 files, deleting around 700 includes and adding ~480 gfp.h
   and ~3000 slab.h inclusions.  The script emitted errors for ~400
   files.

2. Each error was manually checked.  Some didn't need the inclusion,
   some needed manual addition while adding it to implementation .h or
   embedding .c file was more appropriate for others.  This step added
   inclusions to around 150 files.

3. The script was run again and the output was compared to the edits
   from #2 to make sure no file was left behind.

4. Several build tests were done and a couple of problems were fixed.
   e.g. lib/decompress_*.c used malloc/free() wrappers around slab
   APIs requiring slab.h to be added manually.

5. The script was run on all .h files but without automatically
   editing them as sprinkling gfp.h and slab.h inclusions around .h
   files could easily lead to inclusion dependency hell.  Most gfp.h
   inclusion directives were ignored as stuff from gfp.h was usually
   wildly available and often used in preprocessor macros.  Each
   slab.h inclusion directive was examined and added manually as
   necessary.

6. percpu.h was updated not to include slab.h.

7. Build test were done on the following configurations and failures
   were fixed.  CONFIG_GCOV_KERNEL was turned off for all tests (as my
   distributed build env didn't work with gcov compiles) and a few
   more options had to be turned off depending on archs to make things
   build (like ipr on powerpc/64 which failed due to missing writeq).

   * x86 and x86_64 UP and SMP allmodconfig and a custom test config.
   * powerpc and powerpc64 SMP allmodconfig
   * sparc and sparc64 SMP allmodconfig
   * ia64 SMP allmodconfig
   * s390 SMP allmodconfig
   * alpha SMP allmodconfig
   * um on x86_64 SMP allmodconfig

8. percpu.h modifications were reverted so that it could be applied as
   a separate patch and serve as bisection point.

Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-30 22:02:32 +09:00

999 lines
20 KiB
C

/*
* omap iommu: tlb and pagetable primitives
*
* Copyright (C) 2008-2010 Nokia Corporation
*
* Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com>,
* Paul Mundt and Toshihiro Kobayashi
*
* 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.
*/
#include <linux/err.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <asm/cacheflush.h>
#include <plat/iommu.h>
#include "iopgtable.h"
/* accommodate the difference between omap1 and omap2/3 */
static const struct iommu_functions *arch_iommu;
static struct platform_driver omap_iommu_driver;
static struct kmem_cache *iopte_cachep;
/**
* install_iommu_arch - Install archtecure specific iommu functions
* @ops: a pointer to architecture specific iommu functions
*
* There are several kind of iommu algorithm(tlb, pagetable) among
* omap series. This interface installs such an iommu algorighm.
**/
int install_iommu_arch(const struct iommu_functions *ops)
{
if (arch_iommu)
return -EBUSY;
arch_iommu = ops;
return 0;
}
EXPORT_SYMBOL_GPL(install_iommu_arch);
/**
* uninstall_iommu_arch - Uninstall archtecure specific iommu functions
* @ops: a pointer to architecture specific iommu functions
*
* This interface uninstalls the iommu algorighm installed previously.
**/
void uninstall_iommu_arch(const struct iommu_functions *ops)
{
if (arch_iommu != ops)
pr_err("%s: not your arch\n", __func__);
arch_iommu = NULL;
}
EXPORT_SYMBOL_GPL(uninstall_iommu_arch);
/**
* iommu_save_ctx - Save registers for pm off-mode support
* @obj: target iommu
**/
void iommu_save_ctx(struct iommu *obj)
{
arch_iommu->save_ctx(obj);
}
EXPORT_SYMBOL_GPL(iommu_save_ctx);
/**
* iommu_restore_ctx - Restore registers for pm off-mode support
* @obj: target iommu
**/
void iommu_restore_ctx(struct iommu *obj)
{
arch_iommu->restore_ctx(obj);
}
EXPORT_SYMBOL_GPL(iommu_restore_ctx);
/**
* iommu_arch_version - Return running iommu arch version
**/
u32 iommu_arch_version(void)
{
return arch_iommu->version;
}
EXPORT_SYMBOL_GPL(iommu_arch_version);
static int iommu_enable(struct iommu *obj)
{
int err;
if (!obj)
return -EINVAL;
clk_enable(obj->clk);
err = arch_iommu->enable(obj);
clk_disable(obj->clk);
return err;
}
static void iommu_disable(struct iommu *obj)
{
if (!obj)
return;
clk_enable(obj->clk);
arch_iommu->disable(obj);
clk_disable(obj->clk);
}
/*
* TLB operations
*/
void iotlb_cr_to_e(struct cr_regs *cr, struct iotlb_entry *e)
{
BUG_ON(!cr || !e);
arch_iommu->cr_to_e(cr, e);
}
EXPORT_SYMBOL_GPL(iotlb_cr_to_e);
static inline int iotlb_cr_valid(struct cr_regs *cr)
{
if (!cr)
return -EINVAL;
return arch_iommu->cr_valid(cr);
}
static inline struct cr_regs *iotlb_alloc_cr(struct iommu *obj,
struct iotlb_entry *e)
{
if (!e)
return NULL;
return arch_iommu->alloc_cr(obj, e);
}
u32 iotlb_cr_to_virt(struct cr_regs *cr)
{
return arch_iommu->cr_to_virt(cr);
}
EXPORT_SYMBOL_GPL(iotlb_cr_to_virt);
static u32 get_iopte_attr(struct iotlb_entry *e)
{
return arch_iommu->get_pte_attr(e);
}
static u32 iommu_report_fault(struct iommu *obj, u32 *da)
{
return arch_iommu->fault_isr(obj, da);
}
static void iotlb_lock_get(struct iommu *obj, struct iotlb_lock *l)
{
u32 val;
val = iommu_read_reg(obj, MMU_LOCK);
l->base = MMU_LOCK_BASE(val);
l->vict = MMU_LOCK_VICT(val);
BUG_ON(l->base != 0); /* Currently no preservation is used */
}
static void iotlb_lock_set(struct iommu *obj, struct iotlb_lock *l)
{
u32 val;
BUG_ON(l->base != 0); /* Currently no preservation is used */
val = (l->base << MMU_LOCK_BASE_SHIFT);
val |= (l->vict << MMU_LOCK_VICT_SHIFT);
iommu_write_reg(obj, val, MMU_LOCK);
}
static void iotlb_read_cr(struct iommu *obj, struct cr_regs *cr)
{
arch_iommu->tlb_read_cr(obj, cr);
}
static void iotlb_load_cr(struct iommu *obj, struct cr_regs *cr)
{
arch_iommu->tlb_load_cr(obj, cr);
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
iommu_write_reg(obj, 1, MMU_LD_TLB);
}
/**
* iotlb_dump_cr - Dump an iommu tlb entry into buf
* @obj: target iommu
* @cr: contents of cam and ram register
* @buf: output buffer
**/
static inline ssize_t iotlb_dump_cr(struct iommu *obj, struct cr_regs *cr,
char *buf)
{
BUG_ON(!cr || !buf);
return arch_iommu->dump_cr(obj, cr, buf);
}
/**
* load_iotlb_entry - Set an iommu tlb entry
* @obj: target iommu
* @e: an iommu tlb entry info
**/
int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e)
{
int i;
int err = 0;
struct iotlb_lock l;
struct cr_regs *cr;
if (!obj || !obj->nr_tlb_entries || !e)
return -EINVAL;
clk_enable(obj->clk);
for (i = 0; i < obj->nr_tlb_entries; i++) {
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &tmp);
if (!iotlb_cr_valid(&tmp))
break;
}
if (i == obj->nr_tlb_entries) {
dev_dbg(obj->dev, "%s: full: no entry\n", __func__);
err = -EBUSY;
goto out;
}
cr = iotlb_alloc_cr(obj, e);
if (IS_ERR(cr)) {
clk_disable(obj->clk);
return PTR_ERR(cr);
}
iotlb_load_cr(obj, cr);
kfree(cr);
/* increment victim for next tlb load */
if (++l.vict == obj->nr_tlb_entries)
l.vict = 0;
iotlb_lock_set(obj, &l);
out:
clk_disable(obj->clk);
return err;
}
EXPORT_SYMBOL_GPL(load_iotlb_entry);
/**
* flush_iotlb_page - Clear an iommu tlb entry
* @obj: target iommu
* @da: iommu device virtual address
*
* Clear an iommu tlb entry which includes 'da' address.
**/
void flush_iotlb_page(struct iommu *obj, u32 da)
{
struct iotlb_lock l;
int i;
clk_enable(obj->clk);
for (i = 0; i < obj->nr_tlb_entries; i++) {
struct cr_regs cr;
u32 start;
size_t bytes;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &cr);
if (!iotlb_cr_valid(&cr))
continue;
start = iotlb_cr_to_virt(&cr);
bytes = iopgsz_to_bytes(cr.cam & 3);
if ((start <= da) && (da < start + bytes)) {
dev_dbg(obj->dev, "%s: %08x<=%08x(%x)\n",
__func__, start, da, bytes);
iotlb_load_cr(obj, &cr);
iommu_write_reg(obj, 1, MMU_FLUSH_ENTRY);
}
}
clk_disable(obj->clk);
if (i == obj->nr_tlb_entries)
dev_dbg(obj->dev, "%s: no page for %08x\n", __func__, da);
}
EXPORT_SYMBOL_GPL(flush_iotlb_page);
/**
* flush_iotlb_range - Clear an iommu tlb entries
* @obj: target iommu
* @start: iommu device virtual address(start)
* @end: iommu device virtual address(end)
*
* Clear an iommu tlb entry which includes 'da' address.
**/
void flush_iotlb_range(struct iommu *obj, u32 start, u32 end)
{
u32 da = start;
while (da < end) {
flush_iotlb_page(obj, da);
/* FIXME: Optimize for multiple page size */
da += IOPTE_SIZE;
}
}
EXPORT_SYMBOL_GPL(flush_iotlb_range);
/**
* flush_iotlb_all - Clear all iommu tlb entries
* @obj: target iommu
**/
void flush_iotlb_all(struct iommu *obj)
{
struct iotlb_lock l;
clk_enable(obj->clk);
l.base = 0;
l.vict = 0;
iotlb_lock_set(obj, &l);
iommu_write_reg(obj, 1, MMU_GFLUSH);
clk_disable(obj->clk);
}
EXPORT_SYMBOL_GPL(flush_iotlb_all);
#if defined(CONFIG_OMAP_IOMMU_DEBUG_MODULE)
ssize_t iommu_dump_ctx(struct iommu *obj, char *buf, ssize_t bytes)
{
if (!obj || !buf)
return -EINVAL;
clk_enable(obj->clk);
bytes = arch_iommu->dump_ctx(obj, buf, bytes);
clk_disable(obj->clk);
return bytes;
}
EXPORT_SYMBOL_GPL(iommu_dump_ctx);
static int __dump_tlb_entries(struct iommu *obj, struct cr_regs *crs, int num)
{
int i;
struct iotlb_lock saved, l;
struct cr_regs *p = crs;
clk_enable(obj->clk);
iotlb_lock_get(obj, &saved);
memcpy(&l, &saved, sizeof(saved));
for (i = 0; i < num; i++) {
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &tmp);
if (!iotlb_cr_valid(&tmp))
continue;
*p++ = tmp;
}
iotlb_lock_set(obj, &saved);
clk_disable(obj->clk);
return p - crs;
}
/**
* dump_tlb_entries - dump cr arrays to given buffer
* @obj: target iommu
* @buf: output buffer
**/
size_t dump_tlb_entries(struct iommu *obj, char *buf, ssize_t bytes)
{
int i, num;
struct cr_regs *cr;
char *p = buf;
num = bytes / sizeof(*cr);
num = min(obj->nr_tlb_entries, num);
cr = kcalloc(num, sizeof(*cr), GFP_KERNEL);
if (!cr)
return 0;
num = __dump_tlb_entries(obj, cr, num);
for (i = 0; i < num; i++)
p += iotlb_dump_cr(obj, cr + i, p);
kfree(cr);
return p - buf;
}
EXPORT_SYMBOL_GPL(dump_tlb_entries);
int foreach_iommu_device(void *data, int (*fn)(struct device *, void *))
{
return driver_for_each_device(&omap_iommu_driver.driver,
NULL, data, fn);
}
EXPORT_SYMBOL_GPL(foreach_iommu_device);
#endif /* CONFIG_OMAP_IOMMU_DEBUG_MODULE */
/*
* H/W pagetable operations
*/
static void flush_iopgd_range(u32 *first, u32 *last)
{
/* FIXME: L2 cache should be taken care of if it exists */
do {
asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pgd"
: : "r" (first));
first += L1_CACHE_BYTES / sizeof(*first);
} while (first <= last);
}
static void flush_iopte_range(u32 *first, u32 *last)
{
/* FIXME: L2 cache should be taken care of if it exists */
do {
asm("mcr p15, 0, %0, c7, c10, 1 @ flush_pte"
: : "r" (first));
first += L1_CACHE_BYTES / sizeof(*first);
} while (first <= last);
}
static void iopte_free(u32 *iopte)
{
/* Note: freed iopte's must be clean ready for re-use */
kmem_cache_free(iopte_cachep, iopte);
}
static u32 *iopte_alloc(struct iommu *obj, u32 *iopgd, u32 da)
{
u32 *iopte;
/* a table has already existed */
if (*iopgd)
goto pte_ready;
/*
* do the allocation outside the page table lock
*/
spin_unlock(&obj->page_table_lock);
iopte = kmem_cache_zalloc(iopte_cachep, GFP_KERNEL);
spin_lock(&obj->page_table_lock);
if (!*iopgd) {
if (!iopte)
return ERR_PTR(-ENOMEM);
*iopgd = virt_to_phys(iopte) | IOPGD_TABLE;
flush_iopgd_range(iopgd, iopgd);
dev_vdbg(obj->dev, "%s: a new pte:%p\n", __func__, iopte);
} else {
/* We raced, free the reduniovant table */
iopte_free(iopte);
}
pte_ready:
iopte = iopte_offset(iopgd, da);
dev_vdbg(obj->dev,
"%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
__func__, da, iopgd, *iopgd, iopte, *iopte);
return iopte;
}
static int iopgd_alloc_section(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
*iopgd = (pa & IOSECTION_MASK) | prot | IOPGD_SECTION;
flush_iopgd_range(iopgd, iopgd);
return 0;
}
static int iopgd_alloc_super(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
int i;
for (i = 0; i < 16; i++)
*(iopgd + i) = (pa & IOSUPER_MASK) | prot | IOPGD_SUPER;
flush_iopgd_range(iopgd, iopgd + 15);
return 0;
}
static int iopte_alloc_page(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
u32 *iopte = iopte_alloc(obj, iopgd, da);
if (IS_ERR(iopte))
return PTR_ERR(iopte);
*iopte = (pa & IOPAGE_MASK) | prot | IOPTE_SMALL;
flush_iopte_range(iopte, iopte);
dev_vdbg(obj->dev, "%s: da:%08x pa:%08x pte:%p *pte:%08x\n",
__func__, da, pa, iopte, *iopte);
return 0;
}
static int iopte_alloc_large(struct iommu *obj, u32 da, u32 pa, u32 prot)
{
u32 *iopgd = iopgd_offset(obj, da);
u32 *iopte = iopte_alloc(obj, iopgd, da);
int i;
if (IS_ERR(iopte))
return PTR_ERR(iopte);
for (i = 0; i < 16; i++)
*(iopte + i) = (pa & IOLARGE_MASK) | prot | IOPTE_LARGE;
flush_iopte_range(iopte, iopte + 15);
return 0;
}
static int iopgtable_store_entry_core(struct iommu *obj, struct iotlb_entry *e)
{
int (*fn)(struct iommu *, u32, u32, u32);
u32 prot;
int err;
if (!obj || !e)
return -EINVAL;
switch (e->pgsz) {
case MMU_CAM_PGSZ_16M:
fn = iopgd_alloc_super;
break;
case MMU_CAM_PGSZ_1M:
fn = iopgd_alloc_section;
break;
case MMU_CAM_PGSZ_64K:
fn = iopte_alloc_large;
break;
case MMU_CAM_PGSZ_4K:
fn = iopte_alloc_page;
break;
default:
fn = NULL;
BUG();
break;
}
prot = get_iopte_attr(e);
spin_lock(&obj->page_table_lock);
err = fn(obj, e->da, e->pa, prot);
spin_unlock(&obj->page_table_lock);
return err;
}
/**
* iopgtable_store_entry - Make an iommu pte entry
* @obj: target iommu
* @e: an iommu tlb entry info
**/
int iopgtable_store_entry(struct iommu *obj, struct iotlb_entry *e)
{
int err;
flush_iotlb_page(obj, e->da);
err = iopgtable_store_entry_core(obj, e);
#ifdef PREFETCH_IOTLB
if (!err)
load_iotlb_entry(obj, e);
#endif
return err;
}
EXPORT_SYMBOL_GPL(iopgtable_store_entry);
/**
* iopgtable_lookup_entry - Lookup an iommu pte entry
* @obj: target iommu
* @da: iommu device virtual address
* @ppgd: iommu pgd entry pointer to be returned
* @ppte: iommu pte entry pointer to be returned
**/
void iopgtable_lookup_entry(struct iommu *obj, u32 da, u32 **ppgd, u32 **ppte)
{
u32 *iopgd, *iopte = NULL;
iopgd = iopgd_offset(obj, da);
if (!*iopgd)
goto out;
if (*iopgd & IOPGD_TABLE)
iopte = iopte_offset(iopgd, da);
out:
*ppgd = iopgd;
*ppte = iopte;
}
EXPORT_SYMBOL_GPL(iopgtable_lookup_entry);
static size_t iopgtable_clear_entry_core(struct iommu *obj, u32 da)
{
size_t bytes;
u32 *iopgd = iopgd_offset(obj, da);
int nent = 1;
if (!*iopgd)
return 0;
if (*iopgd & IOPGD_TABLE) {
int i;
u32 *iopte = iopte_offset(iopgd, da);
bytes = IOPTE_SIZE;
if (*iopte & IOPTE_LARGE) {
nent *= 16;
/* rewind to the 1st entry */
iopte = iopte_offset(iopgd, (da & IOLARGE_MASK));
}
bytes *= nent;
memset(iopte, 0, nent * sizeof(*iopte));
flush_iopte_range(iopte, iopte + (nent - 1) * sizeof(*iopte));
/*
* do table walk to check if this table is necessary or not
*/
iopte = iopte_offset(iopgd, 0);
for (i = 0; i < PTRS_PER_IOPTE; i++)
if (iopte[i])
goto out;
iopte_free(iopte);
nent = 1; /* for the next L1 entry */
} else {
bytes = IOPGD_SIZE;
if ((*iopgd & IOPGD_SUPER) == IOPGD_SUPER) {
nent *= 16;
/* rewind to the 1st entry */
iopgd = iopgd_offset(obj, (da & IOSUPER_MASK));
}
bytes *= nent;
}
memset(iopgd, 0, nent * sizeof(*iopgd));
flush_iopgd_range(iopgd, iopgd + (nent - 1) * sizeof(*iopgd));
out:
return bytes;
}
/**
* iopgtable_clear_entry - Remove an iommu pte entry
* @obj: target iommu
* @da: iommu device virtual address
**/
size_t iopgtable_clear_entry(struct iommu *obj, u32 da)
{
size_t bytes;
spin_lock(&obj->page_table_lock);
bytes = iopgtable_clear_entry_core(obj, da);
flush_iotlb_page(obj, da);
spin_unlock(&obj->page_table_lock);
return bytes;
}
EXPORT_SYMBOL_GPL(iopgtable_clear_entry);
static void iopgtable_clear_entry_all(struct iommu *obj)
{
int i;
spin_lock(&obj->page_table_lock);
for (i = 0; i < PTRS_PER_IOPGD; i++) {
u32 da;
u32 *iopgd;
da = i << IOPGD_SHIFT;
iopgd = iopgd_offset(obj, da);
if (!*iopgd)
continue;
if (*iopgd & IOPGD_TABLE)
iopte_free(iopte_offset(iopgd, 0));
*iopgd = 0;
flush_iopgd_range(iopgd, iopgd);
}
flush_iotlb_all(obj);
spin_unlock(&obj->page_table_lock);
}
/*
* Device IOMMU generic operations
*/
static irqreturn_t iommu_fault_handler(int irq, void *data)
{
u32 stat, da;
u32 *iopgd, *iopte;
int err = -EIO;
struct iommu *obj = data;
if (!obj->refcount)
return IRQ_NONE;
/* Dynamic loading TLB or PTE */
if (obj->isr)
err = obj->isr(obj);
if (!err)
return IRQ_HANDLED;
clk_enable(obj->clk);
stat = iommu_report_fault(obj, &da);
clk_disable(obj->clk);
if (!stat)
return IRQ_HANDLED;
iopgd = iopgd_offset(obj, da);
if (!(*iopgd & IOPGD_TABLE)) {
dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x\n", __func__,
da, iopgd, *iopgd);
return IRQ_NONE;
}
iopte = iopte_offset(iopgd, da);
dev_err(obj->dev, "%s: da:%08x pgd:%p *pgd:%08x pte:%p *pte:%08x\n",
__func__, da, iopgd, *iopgd, iopte, *iopte);
return IRQ_NONE;
}
static int device_match_by_alias(struct device *dev, void *data)
{
struct iommu *obj = to_iommu(dev);
const char *name = data;
pr_debug("%s: %s %s\n", __func__, obj->name, name);
return strcmp(obj->name, name) == 0;
}
/**
* iommu_get - Get iommu handler
* @name: target iommu name
**/
struct iommu *iommu_get(const char *name)
{
int err = -ENOMEM;
struct device *dev;
struct iommu *obj;
dev = driver_find_device(&omap_iommu_driver.driver, NULL, (void *)name,
device_match_by_alias);
if (!dev)
return ERR_PTR(-ENODEV);
obj = to_iommu(dev);
mutex_lock(&obj->iommu_lock);
if (obj->refcount++ == 0) {
err = iommu_enable(obj);
if (err)
goto err_enable;
flush_iotlb_all(obj);
}
if (!try_module_get(obj->owner))
goto err_module;
mutex_unlock(&obj->iommu_lock);
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
return obj;
err_module:
if (obj->refcount == 1)
iommu_disable(obj);
err_enable:
obj->refcount--;
mutex_unlock(&obj->iommu_lock);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(iommu_get);
/**
* iommu_put - Put back iommu handler
* @obj: target iommu
**/
void iommu_put(struct iommu *obj)
{
if (!obj || IS_ERR(obj))
return;
mutex_lock(&obj->iommu_lock);
if (--obj->refcount == 0)
iommu_disable(obj);
module_put(obj->owner);
mutex_unlock(&obj->iommu_lock);
dev_dbg(obj->dev, "%s: %s\n", __func__, obj->name);
}
EXPORT_SYMBOL_GPL(iommu_put);
/*
* OMAP Device MMU(IOMMU) detection
*/
static int __devinit omap_iommu_probe(struct platform_device *pdev)
{
int err = -ENODEV;
void *p;
int irq;
struct iommu *obj;
struct resource *res;
struct iommu_platform_data *pdata = pdev->dev.platform_data;
if (pdev->num_resources != 2)
return -EINVAL;
obj = kzalloc(sizeof(*obj) + MMU_REG_SIZE, GFP_KERNEL);
if (!obj)
return -ENOMEM;
obj->clk = clk_get(&pdev->dev, pdata->clk_name);
if (IS_ERR(obj->clk))
goto err_clk;
obj->nr_tlb_entries = pdata->nr_tlb_entries;
obj->name = pdata->name;
obj->dev = &pdev->dev;
obj->ctx = (void *)obj + sizeof(*obj);
mutex_init(&obj->iommu_lock);
mutex_init(&obj->mmap_lock);
spin_lock_init(&obj->page_table_lock);
INIT_LIST_HEAD(&obj->mmap);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
err = -ENODEV;
goto err_mem;
}
obj->regbase = ioremap(res->start, resource_size(res));
if (!obj->regbase) {
err = -ENOMEM;
goto err_mem;
}
res = request_mem_region(res->start, resource_size(res),
dev_name(&pdev->dev));
if (!res) {
err = -EIO;
goto err_mem;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
err = -ENODEV;
goto err_irq;
}
err = request_irq(irq, iommu_fault_handler, IRQF_SHARED,
dev_name(&pdev->dev), obj);
if (err < 0)
goto err_irq;
platform_set_drvdata(pdev, obj);
p = (void *)__get_free_pages(GFP_KERNEL, get_order(IOPGD_TABLE_SIZE));
if (!p) {
err = -ENOMEM;
goto err_pgd;
}
memset(p, 0, IOPGD_TABLE_SIZE);
clean_dcache_area(p, IOPGD_TABLE_SIZE);
obj->iopgd = p;
BUG_ON(!IS_ALIGNED((unsigned long)obj->iopgd, IOPGD_TABLE_SIZE));
dev_info(&pdev->dev, "%s registered\n", obj->name);
return 0;
err_pgd:
free_irq(irq, obj);
err_irq:
release_mem_region(res->start, resource_size(res));
iounmap(obj->regbase);
err_mem:
clk_put(obj->clk);
err_clk:
kfree(obj);
return err;
}
static int __devexit omap_iommu_remove(struct platform_device *pdev)
{
int irq;
struct resource *res;
struct iommu *obj = platform_get_drvdata(pdev);
platform_set_drvdata(pdev, NULL);
iopgtable_clear_entry_all(obj);
free_pages((unsigned long)obj->iopgd, get_order(IOPGD_TABLE_SIZE));
irq = platform_get_irq(pdev, 0);
free_irq(irq, obj);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
release_mem_region(res->start, resource_size(res));
iounmap(obj->regbase);
clk_put(obj->clk);
dev_info(&pdev->dev, "%s removed\n", obj->name);
kfree(obj);
return 0;
}
static struct platform_driver omap_iommu_driver = {
.probe = omap_iommu_probe,
.remove = __devexit_p(omap_iommu_remove),
.driver = {
.name = "omap-iommu",
},
};
static void iopte_cachep_ctor(void *iopte)
{
clean_dcache_area(iopte, IOPTE_TABLE_SIZE);
}
static int __init omap_iommu_init(void)
{
struct kmem_cache *p;
const unsigned long flags = SLAB_HWCACHE_ALIGN;
size_t align = 1 << 10; /* L2 pagetable alignement */
p = kmem_cache_create("iopte_cache", IOPTE_TABLE_SIZE, align, flags,
iopte_cachep_ctor);
if (!p)
return -ENOMEM;
iopte_cachep = p;
return platform_driver_register(&omap_iommu_driver);
}
module_init(omap_iommu_init);
static void __exit omap_iommu_exit(void)
{
kmem_cache_destroy(iopte_cachep);
platform_driver_unregister(&omap_iommu_driver);
}
module_exit(omap_iommu_exit);
MODULE_DESCRIPTION("omap iommu: tlb and pagetable primitives");
MODULE_ALIAS("platform:omap-iommu");
MODULE_AUTHOR("Hiroshi DOYU, Paul Mundt and Toshihiro Kobayashi");
MODULE_LICENSE("GPL v2");