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Diffstat (limited to 'arch/powerpc/platforms/pseries/iommu.c')
-rw-r--r--arch/powerpc/platforms/pseries/iommu.c42
1 files changed, 32 insertions, 10 deletions
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 5377dd4b849a..a8c446697f9e 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -48,7 +48,7 @@
#include "plpar_wrappers.h"
-static void tce_build_pSeries(struct iommu_table *tbl, long index,
+static int tce_build_pSeries(struct iommu_table *tbl, long index,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
struct dma_attrs *attrs)
@@ -72,6 +72,7 @@ static void tce_build_pSeries(struct iommu_table *tbl, long index,
uaddr += TCE_PAGE_SIZE;
tcep++;
}
+ return 0;
}
@@ -94,14 +95,19 @@ static unsigned long tce_get_pseries(struct iommu_table *tbl, long index)
return *tcep;
}
-static void tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
+static void tce_free_pSeriesLP(struct iommu_table*, long, long);
+static void tce_freemulti_pSeriesLP(struct iommu_table*, long, long);
+
+static int tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
- u64 rc;
+ u64 rc = 0;
u64 proto_tce, tce;
u64 rpn;
+ int ret = 0;
+ long tcenum_start = tcenum, npages_start = npages;
rpn = (virt_to_abs(uaddr)) >> TCE_SHIFT;
proto_tce = TCE_PCI_READ;
@@ -112,6 +118,13 @@ static void tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
tce = proto_tce | (rpn & TCE_RPN_MASK) << TCE_RPN_SHIFT;
rc = plpar_tce_put((u64)tbl->it_index, (u64)tcenum << 12, tce);
+ if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
+ ret = (int)rc;
+ tce_free_pSeriesLP(tbl, tcenum_start,
+ (npages_start - (npages + 1)));
+ break;
+ }
+
if (rc && printk_ratelimit()) {
printk("tce_build_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
@@ -123,25 +136,27 @@ static void tce_build_pSeriesLP(struct iommu_table *tbl, long tcenum,
tcenum++;
rpn++;
}
+ return ret;
}
static DEFINE_PER_CPU(u64 *, tce_page) = NULL;
-static void tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
+static int tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
long npages, unsigned long uaddr,
enum dma_data_direction direction,
struct dma_attrs *attrs)
{
- u64 rc;
+ u64 rc = 0;
u64 proto_tce;
u64 *tcep;
u64 rpn;
long l, limit;
+ long tcenum_start = tcenum, npages_start = npages;
+ int ret = 0;
if (npages == 1) {
- tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
- direction, attrs);
- return;
+ return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
+ direction, attrs);
}
tcep = __get_cpu_var(tce_page);
@@ -153,9 +168,8 @@ static void tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
tcep = (u64 *)__get_free_page(GFP_ATOMIC);
/* If allocation fails, fall back to the loop implementation */
if (!tcep) {
- tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
+ return tce_build_pSeriesLP(tbl, tcenum, npages, uaddr,
direction, attrs);
- return;
}
__get_cpu_var(tce_page) = tcep;
}
@@ -187,6 +201,13 @@ static void tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
tcenum += limit;
} while (npages > 0 && !rc);
+ if (unlikely(rc == H_NOT_ENOUGH_RESOURCES)) {
+ ret = (int)rc;
+ tce_freemulti_pSeriesLP(tbl, tcenum_start,
+ (npages_start - (npages + limit)));
+ return ret;
+ }
+
if (rc && printk_ratelimit()) {
printk("tce_buildmulti_pSeriesLP: plpar_tce_put failed. rc=%ld\n", rc);
printk("\tindex = 0x%lx\n", (u64)tbl->it_index);
@@ -194,6 +215,7 @@ static void tce_buildmulti_pSeriesLP(struct iommu_table *tbl, long tcenum,
printk("\ttce[0] val = 0x%lx\n", tcep[0]);
show_stack(current, (unsigned long *)__get_SP());
}
+ return ret;
}
static void tce_free_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)