+++ /dev/null
-From 8fe9821b478e5c61fef4786b7ec96b6766af196d Mon Sep 17 00:00:00 2001
-From: Mathias Kresin <dev@kresin.me>
-Date: Mon, 8 Jan 2018 23:04:57 +0100
-Subject: [PATCH] Revert "MIPS: smp-mt: Use CPU interrupt controller IPI IRQ
- domain support"
-
-The problem is that the Lantiq IRQ controller gets registered first and
-it directly handles the MIPS native SW1/2 and HW0 - HW5 IRQs. It looks
-like this controller already registers IRQ 0 - 7 and the generic driver
-only gets the following IRQs starting later.
-
-The upstream discussion can be found at https://www.linux-mips.org/archives/linux-mips/2017-05/msg00059.html
-
-This reverts kernel commit 1eed40043579 ("MIPS: smp-mt: Use CPU interrupt
-controller IPI IRQ domain support").
-
-Signed-off-by: Mathias Kresin <dev@kresin.me>
-
----
- arch/mips/kernel/smp-mt.c | 49 ++++++++++++++++++++++--
- arch/mips/lantiq/irq.c | 52 ++++++++++++++++++++++++++
- arch/mips/mti-malta/malta-int.c | 83 +++++++++++++++++++++++++++++++++++++++--
- 3 files changed, 176 insertions(+), 8 deletions(-)
-
---- a/arch/mips/kernel/smp-mt.c
-+++ b/arch/mips/kernel/smp-mt.c
-@@ -83,8 +83,6 @@ static unsigned int __init smvp_vpe_init
- if (tc != 0)
- smvp_copy_vpe_config();
-
-- cpu_set_vpe_id(&cpu_data[ncpu], tc);
--
- return ncpu;
- }
-
-@@ -116,6 +114,49 @@ static void __init smvp_tc_init(unsigned
- write_tc_c0_tchalt(TCHALT_H);
- }
-
-+static void vsmp_send_ipi_single(int cpu, unsigned int action)
-+{
-+ int i;
-+ unsigned long flags;
-+ int vpflags;
-+
-+#ifdef CONFIG_MIPS_GIC
-+ if (gic_present) {
-+ mips_smp_send_ipi_single(cpu, action);
-+ return;
-+ }
-+#endif
-+ local_irq_save(flags);
-+
-+ vpflags = dvpe(); /* can't access the other CPU's registers whilst MVPE enabled */
-+
-+ switch (action) {
-+ case SMP_CALL_FUNCTION:
-+ i = C_SW1;
-+ break;
-+
-+ case SMP_RESCHEDULE_YOURSELF:
-+ default:
-+ i = C_SW0;
-+ break;
-+ }
-+
-+ /* 1:1 mapping of vpe and tc... */
-+ settc(cpu);
-+ write_vpe_c0_cause(read_vpe_c0_cause() | i);
-+ evpe(vpflags);
-+
-+ local_irq_restore(flags);
-+}
-+
-+static void vsmp_send_ipi_mask(const struct cpumask *mask, unsigned int action)
-+{
-+ unsigned int i;
-+
-+ for_each_cpu(i, mask)
-+ vsmp_send_ipi_single(i, action);
-+}
-+
- static void vsmp_init_secondary(void)
- {
- /* This is Malta specific: IPI,performance and timer interrupts */
-@@ -240,8 +281,8 @@ static void __init vsmp_prepare_cpus(uns
- }
-
- const struct plat_smp_ops vsmp_smp_ops = {
-- .send_ipi_single = mips_smp_send_ipi_single,
-- .send_ipi_mask = mips_smp_send_ipi_mask,
-+ .send_ipi_single = vsmp_send_ipi_single,
-+ .send_ipi_mask = vsmp_send_ipi_mask,
- .init_secondary = vsmp_init_secondary,
- .smp_finish = vsmp_smp_finish,
- .boot_secondary = vsmp_boot_secondary,
---- a/arch/mips/lantiq/irq.c
-+++ b/arch/mips/lantiq/irq.c
-@@ -272,6 +272,47 @@ static void ltq_hw_irq_handler(struct ir
- ltq_hw_irqdispatch(irq_desc_get_irq(desc) - 2);
- }
-
-+#ifdef CONFIG_MIPS_MT_SMP
-+void __init arch_init_ipiirq(int irq, struct irqaction *action)
-+{
-+ setup_irq(irq, action);
-+ irq_set_handler(irq, handle_percpu_irq);
-+}
-+
-+static void ltq_sw0_irqdispatch(void)
-+{
-+ do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
-+}
-+
-+static void ltq_sw1_irqdispatch(void)
-+{
-+ do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
-+}
-+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
-+{
-+ scheduler_ipi();
-+ return IRQ_HANDLED;
-+}
-+
-+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
-+{
-+ generic_smp_call_function_interrupt();
-+ return IRQ_HANDLED;
-+}
-+
-+static struct irqaction irq_resched = {
-+ .handler = ipi_resched_interrupt,
-+ .flags = IRQF_PERCPU,
-+ .name = "IPI_resched"
-+};
-+
-+static struct irqaction irq_call = {
-+ .handler = ipi_call_interrupt,
-+ .flags = IRQF_PERCPU,
-+ .name = "IPI_call"
-+};
-+#endif
-+
- asmlinkage void plat_irq_dispatch(void)
- {
- unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
-@@ -359,6 +400,17 @@ int __init icu_of_init(struct device_nod
- (MAX_IM * INT_NUM_IM_OFFSET) + MIPS_CPU_IRQ_CASCADE,
- &irq_domain_ops, 0);
-
-+#if defined(CONFIG_MIPS_MT_SMP)
-+ if (cpu_has_vint) {
-+ pr_info("Setting up IPI vectored interrupts\n");
-+ set_vi_handler(MIPS_CPU_IPI_RESCHED_IRQ, ltq_sw0_irqdispatch);
-+ set_vi_handler(MIPS_CPU_IPI_CALL_IRQ, ltq_sw1_irqdispatch);
-+ }
-+ arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ,
-+ &irq_resched);
-+ arch_init_ipiirq(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ, &irq_call);
-+#endif
-+
- #ifndef CONFIG_MIPS_MT_SMP
- set_c0_status(IE_IRQ0 | IE_IRQ1 | IE_IRQ2 |
- IE_IRQ3 | IE_IRQ4 | IE_IRQ5);
---- a/arch/mips/mti-malta/malta-int.c
-+++ b/arch/mips/mti-malta/malta-int.c
-@@ -144,6 +144,56 @@ static irqreturn_t corehi_handler(int ir
- return IRQ_HANDLED;
- }
-
-+#ifdef CONFIG_MIPS_MT_SMP
-+
-+#define MIPS_CPU_IPI_RESCHED_IRQ 0 /* SW int 0 for resched */
-+#define C_RESCHED C_SW0
-+#define MIPS_CPU_IPI_CALL_IRQ 1 /* SW int 1 for resched */
-+#define C_CALL C_SW1
-+static int cpu_ipi_resched_irq, cpu_ipi_call_irq;
-+
-+static void ipi_resched_dispatch(void)
-+{
-+ do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_RESCHED_IRQ);
-+}
-+
-+static void ipi_call_dispatch(void)
-+{
-+ do_IRQ(MIPS_CPU_IRQ_BASE + MIPS_CPU_IPI_CALL_IRQ);
-+}
-+
-+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
-+{
-+#ifdef CONFIG_MIPS_VPE_APSP_API_CMP
-+ if (aprp_hook)
-+ aprp_hook();
-+#endif
-+
-+ scheduler_ipi();
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
-+{
-+ generic_smp_call_function_interrupt();
-+
-+ return IRQ_HANDLED;
-+}
-+
-+static struct irqaction irq_resched = {
-+ .handler = ipi_resched_interrupt,
-+ .flags = IRQF_PERCPU,
-+ .name = "IPI_resched"
-+};
-+
-+static struct irqaction irq_call = {
-+ .handler = ipi_call_interrupt,
-+ .flags = IRQF_PERCPU,
-+ .name = "IPI_call"
-+};
-+#endif /* CONFIG_MIPS_MT_SMP */
-+
- static struct irqaction corehi_irqaction = {
- .handler = corehi_handler,
- .name = "CoreHi",
-@@ -171,6 +221,12 @@ static msc_irqmap_t msc_eicirqmap[] __in
-
- static int msc_nr_eicirqs __initdata = ARRAY_SIZE(msc_eicirqmap);
-
-+void __init arch_init_ipiirq(int irq, struct irqaction *action)
-+{
-+ setup_irq(irq, action);
-+ irq_set_handler(irq, handle_percpu_irq);
-+}
-+
- void __init arch_init_irq(void)
- {
- int corehi_irq;
-@@ -216,11 +272,30 @@ void __init arch_init_irq(void)
-
- if (mips_gic_present()) {
- corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
-- } else if (cpu_has_veic) {
-- set_vi_handler(MSC01E_INT_COREHI, corehi_irqdispatch);
-- corehi_irq = MSC01E_INT_BASE + MSC01E_INT_COREHI;
- } else {
-- corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
-+#if defined(CONFIG_MIPS_MT_SMP)
-+ /* set up ipi interrupts */
-+ if (cpu_has_veic) {
-+ set_vi_handler (MSC01E_INT_SW0, ipi_resched_dispatch);
-+ set_vi_handler (MSC01E_INT_SW1, ipi_call_dispatch);
-+ cpu_ipi_resched_irq = MSC01E_INT_SW0;
-+ cpu_ipi_call_irq = MSC01E_INT_SW1;
-+ } else {
-+ cpu_ipi_resched_irq = MIPS_CPU_IRQ_BASE +
-+ MIPS_CPU_IPI_RESCHED_IRQ;
-+ cpu_ipi_call_irq = MIPS_CPU_IRQ_BASE +
-+ MIPS_CPU_IPI_CALL_IRQ;
-+ }
-+ arch_init_ipiirq(cpu_ipi_resched_irq, &irq_resched);
-+ arch_init_ipiirq(cpu_ipi_call_irq, &irq_call);
-+#endif
-+ if (cpu_has_veic) {
-+ set_vi_handler(MSC01E_INT_COREHI,
-+ corehi_irqdispatch);
-+ corehi_irq = MSC01E_INT_BASE + MSC01E_INT_COREHI;
-+ } else {
-+ corehi_irq = MIPS_CPU_IRQ_BASE + MIPSCPU_INT_COREHI;
-+ }
- }
-
- setup_irq(corehi_irq, &corehi_irqaction);
projects / openwrt / openwrt.git / commitdiff