215581bdf1
Make sure BQL is held for all interrupt requests. For MTTCG-enabled configurations, handling soft and hard interrupts between vCPUs must be properly locked. By acquiring BQL, make sure all paths triggering an IRQ are synchronized. Signed-off-by: Miodrag Dinic <miodrag.dinic@imgtec.com> Signed-off-by: Aleksandar Markovic <amarkovic@wavecomp.com> Acked-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*
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* QEMU MIPS interrupt support
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "qemu/main-loop.h"
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#include "hw/hw.h"
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#include "hw/mips/cpudevs.h"
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#include "cpu.h"
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#include "sysemu/kvm.h"
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#include "kvm_mips.h"
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static void cpu_mips_irq_request(void *opaque, int irq, int level)
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{
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MIPSCPU *cpu = opaque;
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CPUMIPSState *env = &cpu->env;
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CPUState *cs = CPU(cpu);
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bool locked = false;
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if (irq < 0 || irq > 7)
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return;
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/* Make sure locking works even if BQL is already held by the caller */
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if (!qemu_mutex_iothread_locked()) {
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locked = true;
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qemu_mutex_lock_iothread();
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}
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if (level) {
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env->CP0_Cause |= 1 << (irq + CP0Ca_IP);
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if (kvm_enabled() && irq == 2) {
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kvm_mips_set_interrupt(cpu, irq, level);
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}
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} else {
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env->CP0_Cause &= ~(1 << (irq + CP0Ca_IP));
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if (kvm_enabled() && irq == 2) {
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kvm_mips_set_interrupt(cpu, irq, level);
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}
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}
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if (env->CP0_Cause & CP0Ca_IP_mask) {
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cpu_interrupt(cs, CPU_INTERRUPT_HARD);
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} else {
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cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
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}
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if (locked) {
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qemu_mutex_unlock_iothread();
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}
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}
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void cpu_mips_irq_init_cpu(MIPSCPU *cpu)
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{
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CPUMIPSState *env = &cpu->env;
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qemu_irq *qi;
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int i;
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qi = qemu_allocate_irqs(cpu_mips_irq_request, mips_env_get_cpu(env), 8);
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for (i = 0; i < 8; i++) {
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env->irq[i] = qi[i];
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}
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}
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void cpu_mips_soft_irq(CPUMIPSState *env, int irq, int level)
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{
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if (irq < 0 || irq > 2) {
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return;
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}
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qemu_set_irq(env->irq[irq], level);
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}
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