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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Damien Le Moal <damien.lemoal@wdc.com>,
	Palmer Dabbelt <palmerdabbelt@google.com>,
	Sasha Levin <sashal@kernel.org>,
	linux-riscv@lists.infradead.org
Subject: [PATCH AUTOSEL 5.10 16/45] riscv: Enable interrupts during syscalls with M-Mode
Date: Tue, 19 Jan 2021 20:25:33 -0500	[thread overview]
Message-ID: <20210120012602.769683-16-sashal@kernel.org> (raw)
In-Reply-To: <20210120012602.769683-1-sashal@kernel.org>

From: Damien Le Moal <damien.lemoal@wdc.com>

[ Upstream commit 643437b996bac9267785e0bd528332e2d5811067 ]

When running is M-Mode (no MMU config), MPIE does not get set. This
results in all syscalls being executed with interrupts disabled as
handle_exception never sets SR_IE as it always sees SR_PIE being
cleared. Fix this by always force enabling interrupts in
handle_syscall when CONFIG_RISCV_M_MODE is enabled.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 arch/riscv/kernel/entry.S | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S
index 524d918f3601b..080eb8d78589d 100644
--- a/arch/riscv/kernel/entry.S
+++ b/arch/riscv/kernel/entry.S
@@ -155,6 +155,15 @@ skip_context_tracking:
 	tail do_trap_unknown
 
 handle_syscall:
+#ifdef CONFIG_RISCV_M_MODE
+	/*
+	 * When running is M-Mode (no MMU config), MPIE does not get set.
+	 * As a result, we need to force enable interrupts here because
+	 * handle_exception did not do set SR_IE as it always sees SR_PIE
+	 * being cleared.
+	 */
+	csrs CSR_STATUS, SR_IE
+#endif
 #if defined(CONFIG_TRACE_IRQFLAGS) || defined(CONFIG_CONTEXT_TRACKING)
 	/* Recover a0 - a7 for system calls */
 	REG_L a0, PT_A0(sp)
-- 
2.27.0


  parent reply	other threads:[~2021-01-20  3:54 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20  1:25 [PATCH AUTOSEL 5.10 01/45] ASoC: Intel: haswell: Add missing pm_ops Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 02/45] ASoC: rt711: mutex between calibration and power state changes Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 03/45] SUNRPC: Handle TCP socket sends with kernel_sendpage() again Sasha Levin
2021-02-08 19:34   ` Trond Myklebust
2021-02-08 19:48     ` Chuck Lever
2021-02-08 20:12       ` Trond Myklebust
2021-02-08 20:17         ` Chuck Lever
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 04/45] ASoC: AMD Renoir - add DMI entry for Lenovo ThinkPad E14 Gen 2 Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 05/45] HID: multitouch: Enable multi-input for Synaptics pointstick/touchpad device Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 06/45] HID: sony: select CONFIG_CRC32 Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 07/45] dm integrity: select CRYPTO_SKCIPHER Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 08/45] x86/hyperv: Fix kexec panic/hang issues Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 09/45] scsi: ufs: Relax the condition of UFSHCI_QUIRK_SKIP_MANUAL_WB_FLUSH_CTRL Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 10/45] scsi: ufs: Correct the LUN used in eh_device_reset_handler() callback Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 11/45] scsi: qedi: Correct max length of CHAP secret Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 12/45] scsi: scsi_debug: Fix memleak in scsi_debug_init() Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 13/45] scsi: sd: Suppress spurious errors when WRITE SAME is being disabled Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 14/45] riscv: Fix kernel time_init() Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 15/45] riscv: Fix sifive serial driver Sasha Levin
2021-01-20  1:25 ` Sasha Levin [this message]
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 17/45] HID: logitech-dj: add the G602 receiver Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 18/45] HID: Ignore battery for Elan touchscreen on ASUS UX550 Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 19/45] clk: tegra30: Add hda clock default rates to clock driver Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 20/45] ALSA: hda/tegra: fix tegra-hda on tegra30 soc Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 21/45] r8152: Add Lenovo Powered USB-C Travel Hub Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 22/45] riscv: cacheinfo: Fix using smp_processor_id() in preemptible Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 23/45] arm64: make atomic helpers __always_inline Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 24/45] xen: Fix event channel callback via INTX/GSI Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 25/45] x86/xen: Add xen_no_vector_callback option to test PCI INTX delivery Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 26/45] x86/xen: Fix xen_hvm_smp_init() when vector callback not available Sasha Levin
2021-01-20  1:35   ` Boris Ostrovsky
2021-01-24 13:11     ` Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 27/45] net: stmmac: use __napi_schedule() for PREEMPT_RT Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 28/45] net: stmmac: Fixed mtu channged by cache aligned Sasha Levin
2021-01-20  6:08   ` Jakub Kicinski
2021-01-20 14:26     ` Sasha Levin
2021-01-21 14:39       ` [Linux-stm32] " Ahmad Fatoum
2021-01-21 16:02         ` Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 29/45] dts: phy: fix missing mdio device and probe failure of vsc8541-01 device Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 30/45] dts: phy: add GPIO number and active state used for phy reset Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 31/45] riscv: defconfig: enable gpio support for HiFive Unleashed Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 32/45] drm/amdgpu/psp: fix psp gfx ctrl cmds Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 33/45] drm/amd/display: disable dcn10 pipe split by default Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 34/45] HID: logitech-hidpp: Add product ID for MX Ergo in Bluetooth mode Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 35/45] drm/amd/display: Fix to be able to stop crc calculation Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 36/45] drm/nouveau/bios: fix issue shadowing expansion ROMs Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 37/45] drm/nouveau/privring: ack interrupts the same way as RM Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 38/45] drm/nouveau/i2c/gm200: increase width of aux semaphore owner fields Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 39/45] drm/nouveau/mmu: fix vram heap sizing Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 40/45] drm/nouveau/kms/nv50-: fix case where notifier buffer is at offset 0 Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 41/45] io_uring: flush timeouts that should already have expired Sasha Levin
2021-01-20  1:25 ` [PATCH AUTOSEL 5.10 42/45] libperf tests: If a test fails return non-zero Sasha Levin
2021-01-20  1:26 ` [PATCH AUTOSEL 5.10 43/45] libperf tests: Fail when failing to get a tracepoint id Sasha Levin
2021-01-20  1:26 ` [PATCH AUTOSEL 5.10 44/45] RISC-V: Set current memblock limit Sasha Levin
2021-01-20  1:26 ` [PATCH AUTOSEL 5.10 45/45] RISC-V: Fix maximum allowed phsyical memory for RV32 Sasha Levin

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