diff options
Diffstat (limited to 'target/linux/ramips/patches-4.3/0058-backport-ensure-core-other-GCR-reflect-correct-core.patch')
-rw-r--r-- | target/linux/ramips/patches-4.3/0058-backport-ensure-core-other-GCR-reflect-correct-core.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-4.3/0058-backport-ensure-core-other-GCR-reflect-correct-core.patch b/target/linux/ramips/patches-4.3/0058-backport-ensure-core-other-GCR-reflect-correct-core.patch new file mode 100644 index 0000000..e8ed6ab --- /dev/null +++ b/target/linux/ramips/patches-4.3/0058-backport-ensure-core-other-GCR-reflect-correct-core.patch @@ -0,0 +1,49 @@ +commit 78a54c4d8e5a7915a4ec2ba0eb461fae50590683 +Author: Paul Burton <paul.burton@imgtec.com> +Date: Tue Sep 22 11:12:18 2015 -0700 + + MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core + + Ensure the update to which core the core-other GCR regions reflect has + taken place before any core-other GCRs are accessed by placing a memory + barrier (sync instruction) between the write to the core-other registers + and any such GCR accesses. + + Signed-off-by: Paul Burton <paul.burton@imgtec.com> + Cc: linux-mips@linux-mips.org + Cc: Bjorn Helgaas <bhelgaas@google.com> + Cc: linux-kernel@vger.kernel.org + Cc: Markos Chandras <markos.chandras@imgtec.com> + Patchwork: https://patchwork.linux-mips.org/patch/11209/ + Signed-off-by: Ralf Baechle <ralf@linux-mips.org> + +--- a/arch/mips/kernel/mips-cm.c ++++ b/arch/mips/kernel/mips-cm.c +@@ -278,6 +278,12 @@ void mips_cm_lock_other(unsigned int cor + } + + write_gcr_cl_other(val); ++ ++ /* ++ * Ensure the core-other region reflects the appropriate core & ++ * VP before any accesses to it occur. ++ */ ++ mb(); + } + + void mips_cm_unlock_other(void) +--- a/arch/mips/kernel/mips-cpc.c ++++ b/arch/mips/kernel/mips-cpc.c +@@ -76,6 +76,12 @@ void mips_cpc_lock_other(unsigned int co + spin_lock_irqsave(&per_cpu(cpc_core_lock, curr_core), + per_cpu(cpc_core_lock_flags, curr_core)); + write_cpc_cl_other(core << CPC_Cx_OTHER_CORENUM_SHF); ++ ++ /* ++ * Ensure the core-other region reflects the appropriate core & ++ * VP before any accesses to it occur. ++ */ ++ mb(); + } + + void mips_cpc_unlock_other(void) |