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Date: Thu, 21 Apr 2022 04:03:42 -0700
From: Max Filippov <jcmvbkbc@...il.com>
To: linux-xtensa@...ux-xtensa.org
Cc: Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] xtensa: add hibernation support
Define ARCH_HIBERNATION_POSSIBLE in Kconfig and implement hibernation
callbacks.
Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
arch/xtensa/Kconfig | 3 ++
arch/xtensa/kernel/Makefile | 1 +
arch/xtensa/kernel/asm-offsets.c | 8 +++
arch/xtensa/kernel/entry.S | 92 ++++++++++++++++++++++++++++++++
arch/xtensa/kernel/hibernate.c | 25 +++++++++
5 files changed, 129 insertions(+)
create mode 100644 arch/xtensa/kernel/hibernate.c
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index c87f5ab493d9..2cc8941e5f03 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -788,6 +788,9 @@ endmenu
menu "Power management options"
+config ARCH_HIBERNATION_POSSIBLE
+ def_bool y
+
source "kernel/power/Kconfig"
endmenu
diff --git a/arch/xtensa/kernel/Makefile b/arch/xtensa/kernel/Makefile
index 5fd6cd15e0fb..897c1c741058 100644
--- a/arch/xtensa/kernel/Makefile
+++ b/arch/xtensa/kernel/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_XTENSA_VARIANT_HAVE_PERF_EVENTS) += perf_event.o
obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
obj-$(CONFIG_S32C1I_SELFTEST) += s32c1i_selftest.o
obj-$(CONFIG_JUMP_LABEL) += jump_label.o
+obj-$(CONFIG_HIBERNATION) += hibernate.o
# In the Xtensa architecture, assembly generates literals which must always
# precede the L32R instruction with a relative offset less than 256 kB.
diff --git a/arch/xtensa/kernel/asm-offsets.c b/arch/xtensa/kernel/asm-offsets.c
index e3b9cf4c2289..9a1db6ffcbf4 100644
--- a/arch/xtensa/kernel/asm-offsets.c
+++ b/arch/xtensa/kernel/asm-offsets.c
@@ -21,6 +21,7 @@
#include <linux/ptrace.h>
#include <linux/mm.h>
#include <linux/kbuild.h>
+#include <linux/suspend.h>
#include <asm/ptrace.h>
#include <asm/traps.h>
@@ -149,5 +150,12 @@ int main(void)
offsetof(struct exc_table, fast_kernel_handler));
DEFINE(EXC_TABLE_DEFAULT, offsetof(struct exc_table, default_handler));
+#ifdef CONFIG_HIBERNATION
+ DEFINE(PBE_ADDRESS, offsetof(struct pbe, address));
+ DEFINE(PBE_ORIG_ADDRESS, offsetof(struct pbe, orig_address));
+ DEFINE(PBE_NEXT, offsetof(struct pbe, next));
+ DEFINE(PBE_SIZE, sizeof(struct pbe));
+#endif
+
return 0;
}
diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index 3255d4f61844..d703ed31254a 100644
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -2155,3 +2155,95 @@ ENTRY(ret_from_kernel_thread)
j common_exception_return
ENDPROC(ret_from_kernel_thread)
+
+#ifdef CONFIG_HIBERNATION
+
+ .bss
+ .align 4
+.Lsaved_regs:
+#if defined(__XTENSA_WINDOWED_ABI__)
+ .fill 2, 4
+#elif defined(__XTENSA_CALL0_ABI__)
+ .fill 6, 4
+#else
+#error Unsupported Xtensa ABI
+#endif
+ .align XCHAL_NCP_SA_ALIGN
+.Lsaved_user_regs:
+ .fill XTREGS_USER_SIZE, 1
+
+ .previous
+
+ENTRY(swsusp_arch_suspend)
+
+ abi_entry_default
+
+ movi a2, .Lsaved_regs
+ movi a3, .Lsaved_user_regs
+ s32i a0, a2, 0
+ s32i a1, a2, 4
+ save_xtregs_user a3 a4 a5 a6 a7 a8 0
+#if defined(__XTENSA_WINDOWED_ABI__)
+ spill_registers_kernel
+#elif defined(__XTENSA_CALL0_ABI__)
+ s32i a12, a2, 8
+ s32i a13, a2, 12
+ s32i a14, a2, 16
+ s32i a15, a2, 20
+#else
+#error Unsupported Xtensa ABI
+#endif
+ abi_call swsusp_save
+ mov a2, abi_rv
+ abi_ret_default
+
+ENDPROC(swsusp_arch_suspend)
+
+ENTRY(swsusp_arch_resume)
+
+ abi_entry_default
+
+#if defined(__XTENSA_WINDOWED_ABI__)
+ spill_registers_kernel
+#endif
+
+ movi a2, restore_pblist
+ l32i a2, a2, 0
+
+.Lcopy_pbe:
+ l32i a3, a2, PBE_ADDRESS
+ l32i a4, a2, PBE_ORIG_ADDRESS
+
+ __loopi a3, a9, PAGE_SIZE, 16
+ l32i a5, a3, 0
+ l32i a6, a3, 4
+ l32i a7, a3, 8
+ l32i a8, a3, 12
+ addi a3, a3, 16
+ s32i a5, a4, 0
+ s32i a6, a4, 4
+ s32i a7, a4, 8
+ s32i a8, a4, 12
+ addi a4, a4, 16
+ __endl a3, a9
+
+ l32i a2, a2, PBE_NEXT
+ bnez a2, .Lcopy_pbe
+
+ movi a2, .Lsaved_regs
+ movi a3, .Lsaved_user_regs
+ l32i a0, a2, 0
+ l32i a1, a2, 4
+ load_xtregs_user a3 a4 a5 a6 a7 a8 0
+#if defined(__XTENSA_CALL0_ABI__)
+ l32i a12, a2, 8
+ l32i a13, a2, 12
+ l32i a14, a2, 16
+ l32i a15, a2, 20
+#endif
+ movi a2, 0
+ abi_ret_default
+
+ENDPROC(swsusp_arch_resume)
+
+#endif
diff --git a/arch/xtensa/kernel/hibernate.c b/arch/xtensa/kernel/hibernate.c
new file mode 100644
index 000000000000..06984327d6e2
--- /dev/null
+++ b/arch/xtensa/kernel/hibernate.c
@@ -0,0 +1,25 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/mm.h>
+#include <linux/suspend.h>
+#include <asm/coprocessor.h>
+
+int pfn_is_nosave(unsigned long pfn)
+{
+ unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
+ unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
+
+ return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
+}
+
+void notrace save_processor_state(void)
+{
+ WARN_ON(num_online_cpus() != 1);
+#if XTENSA_HAVE_COPROCESSORS
+ local_coprocessors_flush_release_all();
+#endif
+}
+
+void notrace restore_processor_state(void)
+{
+}
--
2.30.2
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