Hi Christoph, I love your patch! Yet something to improve: [auto build test ERROR on tip/irq/core] [also build test ERROR on v4.18] [cannot apply to next-20180816] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system] url: https://github.com/0day-ci/linux/commits/Christoph-Hellwig/dt-bindings-interrupt-controller-RISC-V-local-interrupt-controller/20180810-014110 config: riscv-defconfig (attached as .config) compiler: riscv64-linux-gcc (GCC) 8.1.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree GCC_VERSION=8.1.0 make.cross ARCH=riscv All errors (new ones prefixed by >>): In file included from arch/riscv/include/asm/ptrace.h:18, from arch/riscv/include/asm/processor.h:19, from arch/riscv/include/asm/irqflags.h:18, from include/linux/irqflags.h:16, from arch/riscv/include/asm/bitops.h:22, from include/linux/bitops.h:38, from include/linux/kernel.h:11, from include/linux/interrupt.h:6, from drivers/irqchip/irq-sifive-plic.c:7: drivers/irqchip/irq-sifive-plic.c: In function 'plic_handle_irq': >> drivers/irqchip/irq-sifive-plic.c:156:17: error: 'SIE_SEIE' undeclared (first use in this function); did you mean 'SIE_STIE'? csr_clear(sie, SIE_SEIE); ^~~~~~~~ arch/riscv/include/asm/csr.h:124:38: note: in definition of macro 'csr_clear' unsigned long __v = (unsigned long)(val); \ ^~~ drivers/irqchip/irq-sifive-plic.c:156:17: note: each undeclared identifier is reported only once for each function it appears in csr_clear(sie, SIE_SEIE); ^~~~~~~~ arch/riscv/include/asm/csr.h:124:38: note: in definition of macro 'csr_clear' unsigned long __v = (unsigned long)(val); \ ^~~ vim +156 drivers/irqchip/irq-sifive-plic.c > 7 #include <linux/interrupt.h> 8 #include <linux/io.h> 9 #include <linux/irq.h> 10 #include <linux/irqchip.h> 11 #include <linux/irqdomain.h> 12 #include <linux/module.h> 13 #include <linux/of.h> 14 #include <linux/of_address.h> 15 #include <linux/of_irq.h> 16 #include <linux/platform_device.h> 17 #include <linux/spinlock.h> 18 19 /* 20 * This driver implements a version of the RISC-V PLIC with the actual layout 21 * specified in chapter 8 of the SiFive U5 Coreplex Series Manual: 22 * 23 * https://static.dev.sifive.com/U54-MC-RVCoreIP.pdf 24 * 25 * The largest number supported by devices marked as 'riscv,plic0', is 1024, of 26 * which device 0 is defined as non-existent by the RISC-V Privileged Spec. 27 */ 28 29 #define MAX_DEVICES 1024 30 #define MAX_CONTEXTS 15872 31 32 /* 33 * Each interrupt source has a priority register associated with it. 34 * We always hardwire it to one in Linux. 35 */ 36 #define PRIORITY_BASE 0 37 #define PRIORITY_PER_ID 4 38 39 /* 40 * Each hart context has a vector of interrupt enable bits associated with it. 41 * There's one bit for each interrupt source. 42 */ 43 #define ENABLE_BASE 0x2000 44 #define ENABLE_PER_HART 0x80 45 46 /* 47 * Each hart context has a set of control registers associated with it. Right 48 * now there's only two: a source priority threshold over which the hart will 49 * take an interrupt, and a register to claim interrupts. 50 */ 51 #define CONTEXT_BASE 0x200000 52 #define CONTEXT_PER_HART 0x1000 53 #define CONTEXT_THRESHOLD 0x00 54 #define CONTEXT_CLAIM 0x04 55 56 static void __iomem *plic_regs; 57 58 struct plic_handler { 59 bool present; 60 int ctxid; 61 }; 62 static DEFINE_PER_CPU(struct plic_handler, plic_handlers); 63 64 static inline void __iomem *plic_hart_offset(int ctxid) 65 { 66 return plic_regs + CONTEXT_BASE + ctxid * CONTEXT_PER_HART; 67 } 68 69 static inline u32 __iomem *plic_enable_base(int ctxid) 70 { 71 return plic_regs + ENABLE_BASE + ctxid * ENABLE_PER_HART; 72 } 73 74 /* 75 * Protect mask operations on the registers given that we can't assume that 76 * atomic memory operations work on them. 77 */ 78 static DEFINE_RAW_SPINLOCK(plic_toggle_lock); 79 80 static inline void plic_toggle(int ctxid, int hwirq, int enable) 81 { 82 u32 __iomem *reg = plic_enable_base(ctxid) + (hwirq / 32); 83 u32 hwirq_mask = 1 << (hwirq % 32); 84 85 raw_spin_lock(&plic_toggle_lock); 86 if (enable) 87 writel(readl(reg) | hwirq_mask, reg); 88 else 89 writel(readl(reg) & ~hwirq_mask, reg); 90 raw_spin_unlock(&plic_toggle_lock); 91 } 92 93 static inline void plic_irq_toggle(struct irq_data *d, int enable) 94 { 95 int cpu; 96 97 writel(enable, plic_regs + PRIORITY_BASE + d->hwirq * PRIORITY_PER_ID); 98 for_each_cpu(cpu, irq_data_get_affinity_mask(d)) { 99 struct plic_handler *handler = per_cpu_ptr(&plic_handlers, cpu); 100 101 if (handler->present) 102 plic_toggle(handler->ctxid, d->hwirq, enable); 103 } 104 } 105 106 static void plic_irq_enable(struct irq_data *d) 107 { 108 plic_irq_toggle(d, 1); 109 } 110 111 static void plic_irq_disable(struct irq_data *d) 112 { 113 plic_irq_toggle(d, 0); 114 } 115 116 static struct irq_chip plic_chip = { 117 .name = "SiFive PLIC", 118 /* 119 * There is no need to mask/unmask PLIC interrupts. They are "masked" 120 * by reading claim and "unmasked" when writing it back. 121 */ 122 .irq_enable = plic_irq_enable, 123 .irq_disable = plic_irq_disable, 124 }; 125 126 static int plic_irqdomain_map(struct irq_domain *d, unsigned int irq, 127 irq_hw_number_t hwirq) 128 { 129 irq_set_chip_and_handler(irq, &plic_chip, handle_simple_irq); 130 irq_set_chip_data(irq, NULL); 131 irq_set_noprobe(irq); 132 return 0; 133 } 134 135 static const struct irq_domain_ops plic_irqdomain_ops = { 136 .map = plic_irqdomain_map, 137 .xlate = irq_domain_xlate_onecell, 138 }; 139 140 static struct irq_domain *plic_irqdomain; 141 142 /* 143 * Handling an interrupt is a two-step process: first you claim the interrupt 144 * by reading the claim register, then you complete the interrupt by writing 145 * that source ID back to the same claim register. This automatically enables 146 * and disables the interrupt, so there's nothing else to do. 147 */ 148 static void plic_handle_irq(struct pt_regs *regs) 149 { 150 struct plic_handler *handler = this_cpu_ptr(&plic_handlers); 151 void __iomem *claim = plic_hart_offset(handler->ctxid) + CONTEXT_CLAIM; 152 irq_hw_number_t hwirq; 153 154 WARN_ON_ONCE(!handler->present); 155 > 156 csr_clear(sie, SIE_SEIE); 157 while ((hwirq = readl(claim))) { 158 int irq = irq_find_mapping(plic_irqdomain, hwirq); 159 160 if (unlikely(irq <= 0)) 161 pr_warn_ratelimited("can't find mapping for hwirq %lu\n", 162 hwirq); 163 else 164 generic_handle_irq(irq); 165 writel(hwirq, claim); 166 } 167 csr_set(sie, SIE_SEIE); 168 } 169 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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