[MIPS] vpe: handle halting TCs in an errata safe way. (7c3a622d) · Commits · 戴 / test

arch/mips/kernel/vpe.c

+10 −4

Original line number	Diff line number	Diff line
		@@ -1003,6 +1003,7 @@ static void cleanup_tc(struct tc *tc)
		write_tc_c0_tcstatus(tmp);

		write_tc_c0_tchalt(TCHALT_H);
		mips_ihb();

		/* bind it to anything other than VPE1 */
		// write_tc_c0_tcbind(read_tc_c0_tcbind() & ~TCBIND_CURVPE); // \| TCBIND_CURVPE
		@@ -1235,9 +1236,12 @@ int vpe_free(vpe_handle vpe)
		settc(t->index);
		write_vpe_c0_vpeconf0(read_vpe_c0_vpeconf0() & ~VPECONF0_VPA);

		/* mark the TC unallocated and halt'ed */
		write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);
		/* halt the TC */
		write_tc_c0_tchalt(TCHALT_H);
		mips_ihb();

		/* mark the TC unallocated */
		write_tc_c0_tcstatus(read_tc_c0_tcstatus() & ~TCSTATUS_A);

		v->state = VPE_STATE_UNUSED;

		@@ -1533,14 +1537,16 @@ static int __init vpe_module_init(void)
		t->pvpe = get_vpe(0); /* set the parent vpe */
		}

		/* halt the TC */
		write_tc_c0_tchalt(TCHALT_H);
		mips_ihb();

		tmp = read_tc_c0_tcstatus();

		/* mark not activated and not dynamically allocatable */
		tmp &= ~(TCSTATUS_A \| TCSTATUS_DA);
		tmp \|= TCSTATUS_IXMT; /* interrupt exempt */
		write_tc_c0_tcstatus(tmp);

		write_tc_c0_tchalt(TCHALT_H);
		}
		}