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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2017-03-22 09:07:00 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2017-04-01 21:12:27 +1100
commit82228e362f9b7f4b876d0fbb1036c235797c6b1d (patch)
treeba7432ffa3577cd4cadb5bd41e1fc8ac21e4a7d3 /arch/powerpc/platforms/pseries
parentbb1832217a859f6dbe4a45ff2ba7fdcab0bb3958 (diff)
powerpc/pseries: Skip using reserved virtual address range
Now that we use all the available virtual address range, we need to make sure we don't generate VSID such that it overlaps with the reserved vsid range. Reserved vsid range include the virtual address range used by the adjunct partition and also the VRMA virtual segment. We find the context value that can result in generating such a VSID and reserve it early in boot. We don't look at the adjunct range, because for now we disable the adjunct usage in a Linux LPAR via CAS interface. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> [mpe: Rewrite hash__reserve_context_id(), move the rest into pseries] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/platforms/pseries')
-rw-r--r--arch/powerpc/platforms/pseries/lpar.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index 8b1fe895daa3..6541d0b03e4c 100644
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -958,3 +958,64 @@ int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
return rc;
}
+
+static unsigned long vsid_unscramble(unsigned long vsid, int ssize)
+{
+ unsigned long protovsid;
+ unsigned long va_bits = VA_BITS;
+ unsigned long modinv, vsid_modulus;
+ unsigned long max_mod_inv, tmp_modinv;
+
+ if (!mmu_has_feature(MMU_FTR_68_BIT_VA))
+ va_bits = 65;
+
+ if (ssize == MMU_SEGSIZE_256M) {
+ modinv = VSID_MULINV_256M;
+ vsid_modulus = ((1UL << (va_bits - SID_SHIFT)) - 1);
+ } else {
+ modinv = VSID_MULINV_1T;
+ vsid_modulus = ((1UL << (va_bits - SID_SHIFT_1T)) - 1);
+ }
+
+ /*
+ * vsid outside our range.
+ */
+ if (vsid >= vsid_modulus)
+ return 0;
+
+ /*
+ * If modinv is the modular multiplicate inverse of (x % vsid_modulus)
+ * and vsid = (protovsid * x) % vsid_modulus, then we say:
+ * protovsid = (vsid * modinv) % vsid_modulus
+ */
+
+ /* Check if (vsid * modinv) overflow (63 bits) */
+ max_mod_inv = 0x7fffffffffffffffull / vsid;
+ if (modinv < max_mod_inv)
+ return (vsid * modinv) % vsid_modulus;
+
+ tmp_modinv = modinv/max_mod_inv;
+ modinv %= max_mod_inv;
+
+ protovsid = (((vsid * max_mod_inv) % vsid_modulus) * tmp_modinv) % vsid_modulus;
+ protovsid = (protovsid + vsid * modinv) % vsid_modulus;
+
+ return protovsid;
+}
+
+static int __init reserve_vrma_context_id(void)
+{
+ unsigned long protovsid;
+
+ /*
+ * Reserve context ids which map to reserved virtual addresses. For now
+ * we only reserve the context id which maps to the VRMA VSID. We ignore
+ * the addresses in "ibm,adjunct-virtual-addresses" because we don't
+ * enable adjunct support via the "ibm,client-architecture-support"
+ * interface.
+ */
+ protovsid = vsid_unscramble(VRMA_VSID, MMU_SEGSIZE_1T);
+ hash__reserve_context_id(protovsid >> ESID_BITS_1T);
+ return 0;
+}
+machine_device_initcall(pseries, reserve_vrma_context_id);