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pcie: Compat with devices which do not support Link Width, such as ioh3420

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We hack into PCI_EXP_LNKCAP to support device fast plug/unplug
for pcie-root-port. However some devices like ioh3420 does not
suport it, so PCI_EXP_LNKCAP is not set for such devices.

Signed-off-by: Ying Fang <fangying1@huawei.com>
Signed-off-by: Yan Wang <wangyan122@huawei.com>
This commit is contained in:
Yan Wang 2022-02-26 11:13:19 +08:00 committed by yezengruan
parent 00144ede80
commit e40499de24
1 changed files with 50 additions and 0 deletions
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pcie-Compat-with-devices-which-do-not-support-Link-W.patch Normal file
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@ -0,0 +1,50 @@
From 14d1ad1309a1bd035250512368221088c2f83f32 Mon Sep 17 00:00:00 2001
From: fangying <fangying1@huawei.com>
Date: Wed, 18 Mar 2020 12:51:33 +0800
Subject: [PATCH 6/6] pcie: Compat with devices which do not support Link
Width, such as ioh3420
We hack into PCI_EXP_LNKCAP to support device fast plug/unplug
for pcie-root-port. However some devices like ioh3420 does not
suport it, so PCI_EXP_LNKCAP is not set for such devices.
Signed-off-by: Ying Fang <fangying1@huawei.com>
Signed-off-by: Yan Wang <wangyan122@huawei.com>
---
hw/pci/pcie.c | 13 ++++++-------
1 file changed, 6 insertions(+), 7 deletions(-)
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index d7d1504..30c09ed 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -92,13 +92,6 @@ static void pcie_cap_fill_slot_lnk(PCIDevice *dev)
return;
}
- /* Clear and fill LNKCAP from what was configured above */
- pci_long_test_and_clear_mask(exp_cap + PCI_EXP_LNKCAP,
- PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS);
- pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP,
- QEMU_PCI_EXP_LNKCAP_MLW(s->width) |
- QEMU_PCI_EXP_LNKCAP_MLS(s->speed));
-
/*
* Link bandwidth notification is required for all root ports and
* downstream ports supporting links wider than x1 or multiple link
@@ -106,6 +99,12 @@ static void pcie_cap_fill_slot_lnk(PCIDevice *dev)
*/
if (s->width > QEMU_PCI_EXP_LNK_X1 ||
s->speed > QEMU_PCI_EXP_LNK_2_5GT) {
+ /* Clear and fill LNKCAP from what was configured above */
+ pci_long_test_and_clear_mask(exp_cap + PCI_EXP_LNKCAP,
+ PCI_EXP_LNKCAP_MLW | PCI_EXP_LNKCAP_SLS);
+ pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP,
+ QEMU_PCI_EXP_LNKCAP_MLW(s->width) |
+ QEMU_PCI_EXP_LNKCAP_MLS(s->speed));
pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP,
PCI_EXP_LNKCAP_LBNC);
}
--
1.9.1