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Message-Id: <20241027075717.3714821-1-huaisheng.ye@intel.com>
Date: Sun, 27 Oct 2024 15:57:17 +0800
From: Huaisheng Ye <huaisheng.ye@...el.com>
To: linux-cxl@...r.kernel.org,
dan.j.williams@...el.com
Cc: linux-kernel@...r.kernel.org,
pei.p.jia@...el.com,
Huaisheng Ye <huaisheng.ye@...el.com>
Subject: [PATCH] [RFC] cxl/region: Fix region creation for greater than x2 switches
The cxl_port_setup_targets() algorithm fails to identify valid target list
ordering in the presence of 4-way and above switches resulting in
'cxl create-region' failures of the form:
# cxl create-region -d decoder0.0 -g 1024 -s 2G -t ram -w 8 -m mem4 mem1 mem6 mem3 mem2 mem5 mem7 mem0
cxl region: create_region: region0: failed to set target7 to mem0
cxl region: cmd_create_region: created 0 regions
[kernel debug message]
check_last_peer:1213: cxl region0: pci0000:0c:port1: cannot host mem6:decoder7.0 at 2
bus_remove_device:574: bus: 'cxl': remove device region0
QEMU can create this failing topology:
ACPI0017:00 [root0]
|
HB_0 [port1]
/ \
RP_0 RP_1
| |
USP [port2] USP [port3]
/ / \ \ / / \ \
DSP DSP DSP DSP DSP DSP DSP DSP
| | | | | | | |
mem4 mem6 mem2 mem7 mem1 mem3 mem5 mem0
Pos: 0 2 4 6 1 3 5 7
HB: Host Bridge
RP: Root Port
USP: Upstream Port
DSP: Downstream Port
...with the following command steps:
$ qemu-system-x86_64 -machine q35,cxl=on,accel=tcg \
-smp cpus=8 \
-m 8G \
-hda /home/work/vm-images/centos-stream8-02.qcow2 \
-object memory-backend-ram,size=4G,id=m0 \
-object memory-backend-ram,size=4G,id=m1 \
-object memory-backend-ram,size=2G,id=cxl-mem0 \
-object memory-backend-ram,size=2G,id=cxl-mem1 \
-object memory-backend-ram,size=2G,id=cxl-mem2 \
-object memory-backend-ram,size=2G,id=cxl-mem3 \
-object memory-backend-ram,size=2G,id=cxl-mem4 \
-object memory-backend-ram,size=2G,id=cxl-mem5 \
-object memory-backend-ram,size=2G,id=cxl-mem6 \
-object memory-backend-ram,size=2G,id=cxl-mem7 \
-numa node,memdev=m0,cpus=0-3,nodeid=0 \
-numa node,memdev=m1,cpus=4-7,nodeid=1 \
-netdev user,id=net0,hostfwd=tcp::2222-:22 \
-device virtio-net-pci,netdev=net0 \
-device pxb-cxl,bus_nr=12,bus=pcie.0,id=cxl.1 \
-device cxl-rp,port=0,bus=cxl.1,id=root_port0,chassis=0,slot=0 \
-device cxl-rp,port=1,bus=cxl.1,id=root_port1,chassis=0,slot=1 \
-device cxl-upstream,bus=root_port0,id=us0 \
-device cxl-downstream,port=0,bus=us0,id=swport0,chassis=0,slot=4 \
-device cxl-type3,bus=swport0,volatile-memdev=cxl-mem0,id=cxl-vmem0 \
-device cxl-downstream,port=1,bus=us0,id=swport1,chassis=0,slot=5 \
-device cxl-type3,bus=swport1,volatile-memdev=cxl-mem1,id=cxl-vmem1 \
-device cxl-downstream,port=2,bus=us0,id=swport2,chassis=0,slot=6 \
-device cxl-type3,bus=swport2,volatile-memdev=cxl-mem2,id=cxl-vmem2 \
-device cxl-downstream,port=3,bus=us0,id=swport3,chassis=0,slot=7 \
-device cxl-type3,bus=swport3,volatile-memdev=cxl-mem3,id=cxl-vmem3 \
-device cxl-upstream,bus=root_port1,id=us1 \
-device cxl-downstream,port=4,bus=us1,id=swport4,chassis=0,slot=8 \
-device cxl-type3,bus=swport4,volatile-memdev=cxl-mem4,id=cxl-vmem4 \
-device cxl-downstream,port=5,bus=us1,id=swport5,chassis=0,slot=9 \
-device cxl-type3,bus=swport5,volatile-memdev=cxl-mem5,id=cxl-vmem5 \
-device cxl-downstream,port=6,bus=us1,id=swport6,chassis=0,slot=10 \
-device cxl-type3,bus=swport6,volatile-memdev=cxl-mem6,id=cxl-vmem6 \
-device cxl-downstream,port=7,bus=us1,id=swport7,chassis=0,slot=11 \
-device cxl-type3,bus=swport7,volatile-memdev=cxl-mem7,id=cxl-vmem7 \
-M cxl-fmw.0.targets.0=cxl.1,cxl-fmw.0.size=32G &
In Guest OS:
# cxl create-region -d decoder0.0 -g 1024 -s 2G -t ram -w 8 -m mem4 mem1 mem6 mem3 mem2 mem5 mem7 mem0
Fix the method to calculate @distance by iterativeley multiplying the number of targets per switch port. This also follows the algorithm recommended here [1].
Fixes: 27b3f8d13830 ("cxl/region: Program target lists")
Link: http://lore.kernel.org/6538824b52349_7258329466@dwillia2-xfh.jf.intel.com.notmuch [1]
Signed-off-by: Huaisheng Ye <huaisheng.ye@...el.com>
---
drivers/cxl/core/region.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c
index e701e4b04032..9e226a293f45 100644
--- a/drivers/cxl/core/region.c
+++ b/drivers/cxl/core/region.c
@@ -1288,6 +1288,7 @@ static int cxl_port_setup_targets(struct cxl_port *port,
struct cxl_region_params *p = &cxlr->params;
struct cxl_decoder *cxld = cxl_rr->decoder;
struct cxl_switch_decoder *cxlsd;
+ struct cxl_port *iter = port;
u16 eig, peig;
u8 eiw, peiw;
@@ -1304,16 +1305,20 @@ static int cxl_port_setup_targets(struct cxl_port *port,
cxlsd = to_cxl_switch_decoder(&cxld->dev);
if (cxl_rr->nr_targets_set) {
- int i, distance;
+ int i, distance = 1;
+ struct cxl_region_ref *cxl_rr_iter;
/*
- * Passthrough decoders impose no distance requirements between
- * peers
+ * Get distance from the number of distinct targets in region's
+ * interest and the ancestral nr_targets.
*/
- if (cxl_rr->nr_targets == 1)
- distance = 0;
- else
- distance = p->nr_targets / cxl_rr->nr_targets;
+ do {
+ cxl_rr_iter = cxl_rr_load(iter, cxlr);
+ distance *= cxl_rr_iter->nr_targets;
+ iter = to_cxl_port(iter->dev.parent);
+ } while (!is_cxl_root(iter));
+ distance *= cxlrd->cxlsd.cxld.interleave_ways;
+
for (i = 0; i < cxl_rr->nr_targets_set; i++)
if (ep->dport == cxlsd->target[i]) {
rc = check_last_peer(cxled, ep, cxl_rr,
--
2.39.3
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