AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to avoid
unwanted interrupts raised by AFI after pex_rst is asserted.
Following sequence triggers such scenario,
- tegra_pcie_remove() triggers runtime suspend
- pex_rst is asserted in runtime suspend
- PRSNT_MAP bit field in RP_PRIV_MISC register changes from EP_PRSNT to
EP_ABSNT
- This is sensed by AFI and triggers "Slot present pin change" interrupt
- tegra_pcie_isr() function accesses AFI register when runtime suspend
is going through power off sequence
rmmod pci-tegra
pci_generic_config_write32: 108 callbacks suppressed
pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x4c may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x9c may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x88 may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x90 may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x4 may corrupt adjacent RW1C bits
igb 0002:04:00.1: removed PHC on enP2p4s0f1
igb 0002:04:00.0: removed PHC on enP2p4s0f0
pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x4c may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x9c may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x88 may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x90 may corrupt adjacent RW1C bits
pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x4 may corrupt adjacent RW1C bits
rcu: INFO: rcu_preempt self-detected stall on CPU
SError Interrupt on CPU0, code 0xbf000002 -- SError
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.1.0-rc3-next-20190405-00027-gcd8110499e6f-dirty #42
Hardware name: NVIDIA Jetson TX1 Developer Kit (DT)
pstate: 20000085 (nzCv daIf -PAN -UAO)
pc : tegra_pcie_isr+0x58/0x178 [pci_tegra]
lr : tegra_pcie_isr+0x40/0x178 [pci_tegra]
sp : ffff000010003da0
x29: ffff000010003da0 x28: 0000000000000000
x27: ffff8000f9e61000 x26: ffff000010fbf420
x25: ffff000011427f93 x24: ffff8000fa600410
x23: ffff00001129d000 x22: ffff00001129d000
x21: ffff8000f18bf3c0 x20: 0000000000000070
x19: 00000000ffffffff x18: 0000000000000000
x17: 0000000000000000 x16: 0000000000000000
x15: 0000000000000000 x14: ffff000008d40a48
x13: ffff000008d40a30 x12: ffff000008d40a20
x11: ffff000008d40a10 x10: ffff000008d40a00
x9 : ffff000008d409e8 x8 : ffff000008d40ae8
x7 : ffff000008d40ad0 x6 : ffff000010003e58
x5 : ffff8000fac00248 x4 : 0000000000000000
x3 : ffff000008d40b08 x2 : fffffffffffffff8
x1 : ffff000008d3f4e8 x0 : 00000000ffffffff
Kernel panic - not syncing: Asynchronous SError Interrupt
CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 5.1.0-rc3-next-20190405-00027-gcd8110499e6f-dirty #42
Hardware name: NVIDIA Jetson TX1 Developer Kit (DT)
Call trace:
dump_backtrace+0x0/0x158
show_stack+0x14/0x20
dump_stack+0xa8/0xcc
panic+0x140/0x2f4
nmi_panic+0x6c/0x70
arm64_serror_panic+0x74/0x80
__pte_error+0x0/0x28
el1_error+0x84/0xf8
tegra_pcie_isr+0x58/0x178 [pci_tegra]
__handle_irq_event_percpu+0x70/0x198
handle_irq_event_percpu+0x34/0x88
handle_irq_event+0x48/0x78
handle_fasteoi_irq+0xb4/0x190
generic_handle_irq+0x24/0x38
__handle_domain_irq+0x5c/0xb8
gic_handle_irq+0x58/0xa8
el1_irq+0xb8/0x180
cpuidle_enter_state+0x138/0x358
cpuidle_enter+0x18/0x20
call_cpuidle+0x1c/0x48
do_idle+0x230/0x2d0
cpu_startup_entry+0x20/0x28
rest_init+0xd4/0xe0
arch_call_rest_init+0xc/0x14
start_kernel+0x444/0x470
Signed-off-by: Manikanta Maddireddy <mmaddireddy@xxxxxxxxxx>
---
V3:
* Update the commit log and comment to reflect why this fix is required
* MSI interrupt is not disabled
V2: This is new patch in V2
drivers/pci/controller/pci-tegra.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index bb3c0af9c830..d0e517f084a1 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -1622,6 +1622,15 @@ static int tegra_pcie_disable_msi(struct tegra_pcie *pcie)
return 0;
}
+static void tegra_pcie_disable_interrupts(struct tegra_pcie *pcie)
+{
+ u32 value;
+
+ value = afi_readl(pcie, AFI_INTR_MASK);
+ value &= ~AFI_INTR_MASK_INT_MASK;
+ afi_writel(pcie, value, AFI_INTR_MASK);
+}
+
static int tegra_pcie_get_xbar_config(struct tegra_pcie *pcie, u32 lanes,
u32 *xbar)
{
@@ -2466,6 +2475,11 @@ static int __maybe_unused tegra_pcie_pm_suspend(struct device *dev)
tegra_pcie_pme_turnoff(port);
tegra_pcie_disable_ports(pcie);
+ /*
+ * AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to
+ * avoid unwanted interrupts raised by AFI after pex_rst is asserted.
+ */
+ tegra_pcie_disable_interrupts(pcie);
if (pcie->soc->program_uphy) {
err = tegra_pcie_phy_power_off(pcie);
--
2.17.1
