powerpc/iommu: Limit number of TCEs to 512 for H_STUFF_TCE hcall

Currently in tce_freemulti_pSeriesLP() there is no limit on how many
TCEs are passed to the H_STUFF_TCE hcall. This has not caused an issue
until now, but newer firmware releases have started enforcing a limit of
512 TCEs per call.

The limit is correct per the specification (PAPR v2.12 § 14.5.4.2.3).

The code has been in it's current form since it was initially merged.

Cc: stable@vger.kernel.org
Signed-off-by: Gaurav Batra <gbatra@linux.vnet.ibm.com>
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
[mpe: Tweak change log wording & add PAPR reference]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20230525143454.56878-1-gbatra@linux.vnet.ibm.com

diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c
index 918f511..d59e8a9 100644 (file)
--- a/arch/powerpc/platforms/pseries/iommu.c
+++ b/arch/powerpc/platforms/pseries/iommu.c
@@ -317,13 +317,22 @@ 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");