Hello Michael,
Here are the changes in v2 of the patch
1. added some wording to change log to specify why we are seeing the
issue now. Also added "CC: stable@xxxxxxxxxxxxxxx"
2. changed "limit" to unsigned long. I have kept "rpages" as "long"
Thanks,
Gaurav
On 5/25/23 9:34 AM, Gaurav Batra wrote:
As of now, in tce_freemulti_pSeriesLP(), there is no limit on how many TCEs
are passed to H_STUFF_TCE hcall. This was not an issue until now. Newer
firmware releases have started enforcing this requirement.
The interface has been in it's current form since the beginning.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Gaurav Batra <gbatra@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Brian King <brking@xxxxxxxxxxxxxxxxxx>
---
arch/powerpc/platforms/pseries/iommu.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index c74b71d4733d..f159a195101d 100644
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -306,13 +306,22 @@ static void tce_free_pSeriesLP(unsigned long liobn, long tcenum, long tceshift,
static void tce_freemulti_pSeriesLP(struct iommu_table *tbl, long tcenum, long npages)
{
u64 rc;
+ long rpages = npages;
+ unsigned long limit;
if (!firmware_has_feature(FW_FEATURE_STUFF_TCE))
return tce_free_pSeriesLP(tbl->it_index, tcenum,
tbl->it_page_shift, npages);
- rc = plpar_tce_stuff((u64)tbl->it_index,
- (u64)tcenum << tbl->it_page_shift, 0, npages);
+ do {
+ limit = min_t(unsigned long, rpages, 512);
+
+ rc = plpar_tce_stuff((u64)tbl->it_index,
+ (u64)tcenum << tbl->it_page_shift, 0, limit);
+
+ rpages -= limit;
+ tcenum += limit;
+ } while (rpages > 0 && !rc);
if (rc && printk_ratelimit()) {
printk("tce_freemulti_pSeriesLP: plpar_tce_stuff failed\n");
