From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Vineet Gupta <vgupta@synopsys.com>,
Sasha Levin <sashal@kernel.org>,
linux-snps-arc@lists.infradead.org
Subject: [PATCH AUTOSEL 4.19 35/48] ARCv2: support manual regfile save on interrupts
Date: Wed, 13 Mar 2019 15:12:37 -0400 [thread overview]
Message-ID: <20190313191250.158955-35-sashal@kernel.org> (raw)
In-Reply-To: <20190313191250.158955-1-sashal@kernel.org>
From: Vineet Gupta <vgupta@synopsys.com>
[ Upstream commit e494239a007e601448110ac304fe055951f9de3b ]
There's a hardware bug which affects the HSDK platform, triggered by
micro-ops for auto-saving regfile on taken interrupt. The workaround is
to inhibit autosave.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/arc/Kconfig | 8 +++++
arch/arc/include/asm/entry-arcv2.h | 54 ++++++++++++++++++++++++++++++
arch/arc/kernel/entry-arcv2.S | 4 ++-
arch/arc/kernel/intc-arcv2.c | 2 ++
arch/arc/plat-hsdk/Kconfig | 1 +
5 files changed, 68 insertions(+), 1 deletion(-)
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index ac69f307dcfe..74953e76a57d 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -420,6 +420,14 @@ config ARC_HAS_ACCL_REGS
(also referred to as r58:r59). These can also be used by gcc as GPR so
kernel needs to save/restore per process
+config ARC_IRQ_NO_AUTOSAVE
+ bool "Disable hardware autosave regfile on interrupts"
+ default n
+ help
+ On HS cores, taken interrupt auto saves the regfile on stack.
+ This is programmable and can be optionally disabled in which case
+ software INTERRUPT_PROLOGUE/EPILGUE do the needed work
+
endif # ISA_ARCV2
endmenu # "ARC CPU Configuration"
diff --git a/arch/arc/include/asm/entry-arcv2.h b/arch/arc/include/asm/entry-arcv2.h
index 309f4e6721b3..225e7df2d8ed 100644
--- a/arch/arc/include/asm/entry-arcv2.h
+++ b/arch/arc/include/asm/entry-arcv2.h
@@ -17,6 +17,33 @@
;
; Now manually save: r12, sp, fp, gp, r25
+#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
+.ifnc \called_from, exception
+ st.as r9, [sp, -10] ; save r9 in it's final stack slot
+ sub sp, sp, 12 ; skip JLI, LDI, EI
+
+ PUSH lp_count
+ PUSHAX lp_start
+ PUSHAX lp_end
+ PUSH blink
+
+ PUSH r11
+ PUSH r10
+
+ sub sp, sp, 4 ; skip r9
+
+ PUSH r8
+ PUSH r7
+ PUSH r6
+ PUSH r5
+ PUSH r4
+ PUSH r3
+ PUSH r2
+ PUSH r1
+ PUSH r0
+.endif
+#endif
+
#ifdef CONFIG_ARC_HAS_ACCL_REGS
PUSH r59
PUSH r58
@@ -86,6 +113,33 @@
POP r59
#endif
+#ifdef CONFIG_ARC_IRQ_NO_AUTOSAVE
+.ifnc \called_from, exception
+ POP r0
+ POP r1
+ POP r2
+ POP r3
+ POP r4
+ POP r5
+ POP r6
+ POP r7
+ POP r8
+ POP r9
+ POP r10
+ POP r11
+
+ POP blink
+ POPAX lp_end
+ POPAX lp_start
+
+ POP r9
+ mov lp_count, r9
+
+ add sp, sp, 12 ; skip JLI, LDI, EI
+ ld.as r9, [sp, -10] ; reload r9 which got clobbered
+.endif
+#endif
+
.endm
/*------------------------------------------------------------------------*/
diff --git a/arch/arc/kernel/entry-arcv2.S b/arch/arc/kernel/entry-arcv2.S
index cc558a25b8fa..562089d62d9d 100644
--- a/arch/arc/kernel/entry-arcv2.S
+++ b/arch/arc/kernel/entry-arcv2.S
@@ -209,7 +209,9 @@ restore_regs:
;####### Return from Intr #######
debug_marker_l1:
- bbit1.nt r0, STATUS_DE_BIT, .Lintr_ret_to_delay_slot
+ ; bbit1.nt r0, STATUS_DE_BIT, .Lintr_ret_to_delay_slot
+ btst r0, STATUS_DE_BIT ; Z flag set if bit clear
+ bnz .Lintr_ret_to_delay_slot ; branch if STATUS_DE_BIT set
.Lisr_ret_fast_path:
; Handle special case #1: (Entry via Exception, Return via IRQ)
diff --git a/arch/arc/kernel/intc-arcv2.c b/arch/arc/kernel/intc-arcv2.c
index 067ea362fb3e..cf18b3e5a934 100644
--- a/arch/arc/kernel/intc-arcv2.c
+++ b/arch/arc/kernel/intc-arcv2.c
@@ -49,11 +49,13 @@ void arc_init_IRQ(void)
*(unsigned int *)&ictrl = 0;
+#ifndef CONFIG_ARC_IRQ_NO_AUTOSAVE
ictrl.save_nr_gpr_pairs = 6; /* r0 to r11 (r12 saved manually) */
ictrl.save_blink = 1;
ictrl.save_lp_regs = 1; /* LP_COUNT, LP_START, LP_END */
ictrl.save_u_to_u = 0; /* user ctxt saved on kernel stack */
ictrl.save_idx_regs = 1; /* JLI, LDI, EI */
+#endif
WRITE_AUX(AUX_IRQ_CTRL, ictrl);
diff --git a/arch/arc/plat-hsdk/Kconfig b/arch/arc/plat-hsdk/Kconfig
index 9356753c2ed8..c285a83cbf08 100644
--- a/arch/arc/plat-hsdk/Kconfig
+++ b/arch/arc/plat-hsdk/Kconfig
@@ -9,6 +9,7 @@ menuconfig ARC_SOC_HSDK
bool "ARC HS Development Kit SOC"
depends on ISA_ARCV2
select ARC_HAS_ACCL_REGS
+ select ARC_IRQ_NO_AUTOSAVE
select CLK_HSDK
select RESET_HSDK
select MIGHT_HAVE_PCI
--
2.19.1
next prev parent reply other threads:[~2019-03-13 19:14 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-13 19:12 [PATCH AUTOSEL 4.19 01/48] clk: sunxi-ng: v3s: Fix TCON reset de-assert bit Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 02/48] kallsyms: Handle too long symbols in kallsyms.c Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 03/48] clk: sunxi: A31: Fix wrong AHB gate number Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 04/48] esp: Skip TX bytes accounting when sending from a request socket Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 05/48] ARM: 8824/1: fix a migrating irq bug when hotplug cpu Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 06/48] bpf: only adjust gso_size on bytestream protocols Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 07/48] bpf: fix lockdep false positive in stackmap Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 08/48] af_key: unconditionally clone on broadcast Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 09/48] ARM: 8835/1: dma-mapping: Clear DMA ops on teardown Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 10/48] assoc_array: Fix shortcut creation Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 11/48] keys: Fix dependency loop between construction record and auth key Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 12/48] scsi: libiscsi: Fix race between iscsi_xmit_task and iscsi_complete_task Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 13/48] net: systemport: Fix reception of BPDUs Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 14/48] net: dsa: bcm_sf2: Do not assume DSA master supports WoL Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 15/48] pinctrl: meson: meson8b: fix the sdxc_a data 1..3 pins Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 16/48] qmi_wwan: apply SET_DTR quirk to Sierra WP7607 Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 17/48] net: mv643xx_eth: disable clk on error path in mv643xx_eth_shared_probe() Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 18/48] xfrm: Fix inbound traffic via XFRM interfaces across network namespaces Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 19/48] mailbox: bcm-flexrm-mailbox: Fix FlexRM ring flush timeout issue Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 20/48] ASoC: topology: free created components in tplg load error Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 21/48] qed: Fix iWARP buffer size provided for syn packet processing Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 22/48] qed: Fix iWARP syn packet mac address validation Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 23/48] ARM: dts: armada-xp: fix Armada XP boards NAND description Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 24/48] arm64: Relax GIC version check during early boot Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 25/48] ARM: tegra: Restore DT ABI on Tegra124 Chromebooks Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 26/48] net: marvell: mvneta: fix DMA debug warning Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 27/48] kasan, slub: move kasan_poison_slab hook before page_address Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 28/48] mm: handle lru_add_drain_all for UP properly Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 29/48] tmpfs: fix link accounting when a tmpfile is linked in Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 30/48] kasan, slab: fix conflicts with CONFIG_HARDENED_USERCOPY Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 31/48] kasan, slab: make freelist stored without tags Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 32/48] ixgbe: fix older devices that do not support IXGBE_MRQC_L3L4TXSWEN Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 33/48] ARCv2: lib: memcpy: fix doing prefetchw outside of buffer Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 34/48] ARC: uacces: remove lp_start, lp_end from clobber list Sasha Levin
2019-03-13 19:12 ` Sasha Levin [this message]
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 36/48] ARCv2: don't assume core 0x54 has dual issue Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 37/48] phonet: fix building with clang Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 38/48] mac80211_hwsim: propagate genlmsg_reply return code Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 39/48] bpf, lpm: fix lookup bug in map_delete_elem Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 40/48] net: thunderx: make CFG_DONE message to run through generic send-ack sequence Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 41/48] net: thunderx: add nicvf_send_msg_to_pf result check for set_rx_mode_task Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 42/48] nfp: bpf: fix code-gen bug on BPF_ALU | BPF_XOR | BPF_K Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 43/48] nfp: bpf: fix ALU32 high bits clearance bug Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 44/48] bnxt_en: Fix typo in firmware message timeout logic Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 45/48] bnxt_en: Wait longer for the firmware message response to complete Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 46/48] mdio_bus: Fix use-after-free on device_register fails Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 47/48] net: set static variable an initial value in atl2_probe() Sasha Levin
2019-03-13 19:12 ` [PATCH AUTOSEL 4.19 48/48] selftests: fib_tests: sleep after changing carrier. again Sasha Levin
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