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omap iommu: Introduce iteration macro for iotlb entry scan

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There are some places to scan iotlb entries. This iteration macro
could make these code a bit simpler with proceeding iotlb entries
transparently.

Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
Tested-by: Hari Kanigeri <h-kanigeri2@ti.com>
This commit is contained in:
Hiroshi DOYU 2010-04-27 05:37:12 +00:00
parent be6d8026a2
commit 37c2836c45
1 changed files with 31 additions and 27 deletions
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56
arch/arm/plat-omap/iommu.c
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@ -25,6 +25,11 @@
#include "iopgtable.h"
#define for_each_iotlb_cr(obj, n, __i, cr) \
for (__i = 0; \
(__i < (n)) && (cr = __iotlb_read_cr((obj), __i), true); \
__i++)
/* accommodate the difference between omap1 and omap2/3 */
static const struct iommu_functions *arch_iommu;
@ -211,6 +216,20 @@ static inline ssize_t iotlb_dump_cr(struct iommu *obj, struct cr_regs *cr,
return arch_iommu->dump_cr(obj, cr, buf);
}
/* only used in iotlb iteration for-loop */
static struct cr_regs __iotlb_read_cr(struct iommu *obj, int n)
{
struct cr_regs cr;
struct iotlb_lock l;
iotlb_lock_get(obj, &l);
l.vict = n;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &cr);
return cr;
}
/**
* load_iotlb_entry - Set an iommu tlb entry
* @obj: target iommu
@ -218,7 +237,6 @@ static inline ssize_t iotlb_dump_cr(struct iommu *obj, struct cr_regs *cr,
**/
int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e)
{
int i;
int err = 0;
struct iotlb_lock l;
struct cr_regs *cr;
@ -235,21 +253,20 @@ int load_iotlb_entry(struct iommu *obj, struct iotlb_entry *e)
goto out;
}
if (!e->prsvd) {
for (i = l.base; i < obj->nr_tlb_entries; i++) {
int i;
struct cr_regs tmp;
iotlb_lock_get(obj, &l);
l.vict = i;
iotlb_lock_set(obj, &l);
iotlb_read_cr(obj, &tmp);
for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, 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;
}
iotlb_lock_get(obj, &l);
} else {
l.vict = l.base;
iotlb_lock_set(obj, &l);
@ -285,20 +302,15 @@ EXPORT_SYMBOL_GPL(load_iotlb_entry);
**/
void flush_iotlb_page(struct iommu *obj, u32 da)
{
struct iotlb_lock l;
int i;
struct cr_regs cr;
clk_enable(obj->clk);
for (i = 0; i < obj->nr_tlb_entries; i++) {
struct cr_regs cr;
for_each_iotlb_cr(obj, obj->nr_tlb_entries, i, 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;
@ -308,7 +320,6 @@ void flush_iotlb_page(struct iommu *obj, u32 da)
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);
}
}
@ -379,26 +390,19 @@ 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 iotlb_lock saved;
struct cr_regs tmp;
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);
for_each_iotlb_cr(obj, num, i, tmp) {
if (!iotlb_cr_valid(&tmp))
continue;
*p++ = tmp;
}
iotlb_lock_set(obj, &saved);
clk_disable(obj->clk);