Commit-ID: e879c1124a6c5c3367f20a254909605e7ee938c1 Gitweb: http://git.kernel.org/tip/e879c1124a6c5c3367f20a254909605e7ee938c1 Author: Andrew Banman <[email protected]> AuthorDate: Wed, 21 Sep 2016 11:09:19 -0500 Committer: Ingo Molnar <[email protected]> CommitDate: Thu, 22 Sep 2016 11:16:14 +0200
x86/platform/uv/BAU: Disable software timeout on UV4 hardware Software timeouts are not currently supported on BAU for UV4. Instead, the BAU will rely on hardware-level fairness protocols to determine broadcast timeouts. Do not call enable_timeouts or calculate_destination_timeout on UV4. These functions write to pre-UV4 MMRs so they generate error messages on UV4. Signed-off-by: Andrew Banman <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Acked-by: Mike Travis <[email protected]> Acked-by: Dimitri Sivanich <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/platform/uv/tlb_uv.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c index ddbeb16..72a5de7 100644 --- a/arch/x86/platform/uv/tlb_uv.c +++ b/arch/x86/platform/uv/tlb_uv.c @@ -2109,7 +2109,8 @@ static int __init init_per_cpu(int nuvhubs, int base_part_pnode) void *vp; struct uvhub_desc *uvhub_descs; - timeout_us = calculate_destination_timeout(); + if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub()) + timeout_us = calculate_destination_timeout(); vp = kmalloc(nuvhubs * sizeof(struct uvhub_desc), GFP_KERNEL); uvhub_descs = (struct uvhub_desc *)vp; @@ -2171,7 +2172,9 @@ static int __init uv_bau_init(void) uv_base_pnode = uv_blade_to_pnode(uvhub); } - enable_timeouts(); + /* software timeouts are not supported on UV4 */ + if (is_uv3_hub() || is_uv2_hub() || is_uv1_hub()) + enable_timeouts(); if (init_per_cpu(nuvhubs, uv_base_pnode)) { set_bau_off();
