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[46.91.239.54]) by smtp.gmail.com with ESMTPSA id v6sm6362452wru.6.2019.06.04.06.08.39 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 04 Jun 2019 06:08:39 -0700 (PDT) Date: Tue, 4 Jun 2019 15:08:38 +0200 From: Thierry Reding To: Manikanta Maddireddy Cc: bhelgaas@google.com, robh+dt@kernel.org, mark.rutland@arm.com, jonathanh@nvidia.com, lorenzo.pieralisi@arm.com, vidyas@nvidia.com, linux-tegra@vger.kernel.org, linux-pci@vger.kernel.org, devicetree@vger.kernel.org Subject: Re: [PATCH V4 04/28] PCI: tegra: Mask AFI_INTR in runtime suspend Message-ID: <20190604130838.GR16519@ulmo> References: <20190516055307.25737-1-mmaddireddy@nvidia.com> <20190516055307.25737-5-mmaddireddy@nvidia.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="0Qexx6XJGNEACt6j" Content-Disposition: inline In-Reply-To: <20190516055307.25737-5-mmaddireddy@nvidia.com> User-Agent: Mutt/1.11.4 (2019-03-13) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org --0Qexx6XJGNEACt6j Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Thu, May 16, 2019 at 11:22:43AM +0530, Manikanta Maddireddy wrote: > AFI_INTR is unmasked in tegra_pcie_enable_controller(), mask it to avoid > unwanted interrupts raised by AFI after pex_rst is asserted. >=20 > 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 >=20 > 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 cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x9c may cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x88 may cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x90 may cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:02.0 offset 0x4 may corr= upt 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 cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x9c may cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x88 may cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x90 may cor= rupt adjacent RW1C bits > pci_bus 0002:00: 2-byte config write to 0002:00:01.0 offset 0x4 may corr= upt 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 >=20 > Signed-off-by: Manikanta Maddireddy > --- > V4: No change >=20 > V3: > * Update the commit log and comment to reflect why this fix is required > * MSI interrupt is not disabled >=20 > V2: This is new patch in V2 >=20 > drivers/pci/controller/pci-tegra.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) >=20 > 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_pci= e *pcie) > return 0; > } > =20 > +static void tegra_pcie_disable_interrupts(struct tegra_pcie *pcie) > +{ > + u32 value; > + > + value =3D afi_readl(pcie, AFI_INTR_MASK); > + value &=3D ~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(st= ruct device *dev) > tegra_pcie_pme_turnoff(port); > =20 > tegra_pcie_disable_ports(pcie); > + /* Use a blank line before block-style comments (and typically comments in general) for better readability. Other than than: Acked-by: Thierry Reding > + * 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); > =20 > if (pcie->soc->program_uphy) { > err =3D tegra_pcie_phy_power_off(pcie); > --=20 > 2.17.1 >=20 --0Qexx6XJGNEACt6j Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEiOrDCAFJzPfAjcif3SOs138+s6EFAlz2bVMACgkQ3SOs138+ s6Gn0Q/+IV7+AniIum44ShgAwkcVOVySNa6cNQem8a0reLjG6j7sJi/ILtm3UYb+ NfnXjIbCP8xYBu7WD902NWZHyzk2byXonUAPHETYnMDTM3I0VjI0HdlHO0LqHhDi WGIlOJeReM3fINf6N7xUgDsZO+xj/mPQoeIABX9LaU0K2ZxQiodVL7WxB/18V+Mc KiVDUbqONpvL0nLvtArjghwtCfLQaUDPikPjOSC9CaqC7UOvREEE9L5JU9jF5Bhr gmjy/NO8OHuoo0i/BqDPBmjcLpPDxqbpxRYgEyctFqIKGL7lSoUYfHJDT4CiQH75 UqAVIGvWNPEXOtpj56QR2al4LgW00riohF3MgUEEc1OIrbedK8hx+fQ3VJe0mXYB ZFmOF0wOQH3MU/U6qbltBYUbtbVCbOsTcbFjcBlWnXcmLHqSapJn0qbHVcigrvfN lo/iZP0luqFCyI6cTNLvRPPKQmmcPqaTka+1gCZW3mKBsaYHxgJGEbs2woNHGAr0 SIJrqD61fy//GVKodgStlP4RcPWBmavnvC0JeDftkTgZk3BkEoqJwKWxBOn6eI15 pZ+xpZoylzz3qlxCUih+G0OIz8enRztkbSAweSNaEiWBrsdS5VACTWV/ka1q271S ma3jPVsSKDdpC/bq3lazBn1Vlz8+FAPDDEnHL21ZFtNEC3i/Grk= =rSAz -----END PGP SIGNATURE----- --0Qexx6XJGNEACt6j--