diff options
Diffstat (limited to 'target/linux/generic/patches-4.4/062-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch')
| -rw-r--r-- | target/linux/generic/patches-4.4/062-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch | 116 |
1 files changed, 0 insertions, 116 deletions
diff --git a/target/linux/generic/patches-4.4/062-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch b/target/linux/generic/patches-4.4/062-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch deleted file mode 100644 index 9bd2336974..0000000000 --- a/target/linux/generic/patches-4.4/062-04-MIPS-Switch-to-the-irq_stack-in-interrupts.patch +++ /dev/null @@ -1,116 +0,0 @@ -From: Matt Redfearn <matt.redfearn@imgtec.com> -Date: Mon, 19 Dec 2016 14:20:59 +0000 -Subject: [PATCH] MIPS: Switch to the irq_stack in interrupts - -When enterring interrupt context via handle_int or except_vec_vi, switch -to the irq_stack of the current CPU if it is not already in use. - -The current stack pointer is masked with the thread size and compared to -the base or the irq stack. If it does not match then the stack pointer -is set to the top of that stack, otherwise this is a nested irq being -handled on the irq stack so the stack pointer should be left as it was. - -The in-use stack pointer is placed in the callee saved register s1. It -will be saved to the stack when plat_irq_dispatch is invoked and can be -restored once control returns here. - -Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com> ---- - ---- a/arch/mips/kernel/genex.S -+++ b/arch/mips/kernel/genex.S -@@ -188,9 +188,44 @@ NESTED(handle_int, PT_SIZE, sp) - - LONG_L s0, TI_REGS($28) - LONG_S sp, TI_REGS($28) -- PTR_LA ra, ret_from_irq -- PTR_LA v0, plat_irq_dispatch -- jr v0 -+ -+ /* -+ * SAVE_ALL ensures we are using a valid kernel stack for the thread. -+ * Check if we are already using the IRQ stack. -+ */ -+ move s1, sp # Preserve the sp -+ -+ /* Get IRQ stack for this CPU */ -+ ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG -+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) -+ lui k1, %hi(irq_stack) -+#else -+ lui k1, %highest(irq_stack) -+ daddiu k1, %higher(irq_stack) -+ dsll k1, 16 -+ daddiu k1, %hi(irq_stack) -+ dsll k1, 16 -+#endif -+ LONG_SRL k0, SMP_CPUID_PTRSHIFT -+ LONG_ADDU k1, k0 -+ LONG_L t0, %lo(irq_stack)(k1) -+ -+ # Check if already on IRQ stack -+ PTR_LI t1, ~(_THREAD_SIZE-1) -+ and t1, t1, sp -+ beq t0, t1, 2f -+ -+ /* Switch to IRQ stack */ -+ li t1, _IRQ_STACK_SIZE -+ PTR_ADD sp, t0, t1 -+ -+2: -+ jal plat_irq_dispatch -+ -+ /* Restore sp */ -+ move sp, s1 -+ -+ j ret_from_irq - #ifdef CONFIG_CPU_MICROMIPS - nop - #endif -@@ -263,8 +298,44 @@ NESTED(except_vec_vi_handler, 0, sp) - - LONG_L s0, TI_REGS($28) - LONG_S sp, TI_REGS($28) -- PTR_LA ra, ret_from_irq -- jr v0 -+ -+ /* -+ * SAVE_ALL ensures we are using a valid kernel stack for the thread. -+ * Check if we are already using the IRQ stack. -+ */ -+ move s1, sp # Preserve the sp -+ -+ /* Get IRQ stack for this CPU */ -+ ASM_CPUID_MFC0 k0, ASM_SMP_CPUID_REG -+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32) -+ lui k1, %hi(irq_stack) -+#else -+ lui k1, %highest(irq_stack) -+ daddiu k1, %higher(irq_stack) -+ dsll k1, 16 -+ daddiu k1, %hi(irq_stack) -+ dsll k1, 16 -+#endif -+ LONG_SRL k0, SMP_CPUID_PTRSHIFT -+ LONG_ADDU k1, k0 -+ LONG_L t0, %lo(irq_stack)(k1) -+ -+ # Check if already on IRQ stack -+ PTR_LI t1, ~(_THREAD_SIZE-1) -+ and t1, t1, sp -+ beq t0, t1, 2f -+ -+ /* Switch to IRQ stack */ -+ li t1, _IRQ_STACK_SIZE -+ PTR_ADD sp, t0, t1 -+ -+2: -+ jal plat_irq_dispatch -+ -+ /* Restore sp */ -+ move sp, s1 -+ -+ j ret_from_irq - END(except_vec_vi_handler) - - /* |