Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7c3a622d9c8e88117a8d647756827852dd8c8432
Commit: 7c3a622d9c8e88117a8d647756827852dd8c8432
Parent: 8dfa741f146b39eb59ef2094e03f47079ca99eb0
Author: Nigel Stephens <[EMAIL PROTECTED]>
AuthorDate: Thu Nov 8 13:25:51 2007 +0000
Committer: Ralf Baechle <[EMAIL PROTECTED]>
CommitDate: Thu Nov 15 23:21:50 2007 +0000
[MIPS] vpe: handle halting TCs in an errata safe way.
Adds a JR.HB after halting a TC, to ensure that the TC has really halted.
only modifies the TCSTATUS register when the TC is safely halted.
Signed-off-by: Ralf Baechle <[EMAIL PROTECTED]>
---
arch/mips/kernel/vpe.c | 14 ++++++++++----
1 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 436a64f..38bd33f 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -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);
}
}
-
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