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author | Pavel Fedin <p.fedin@samsung.com> | 2015-09-24 01:29:36 +0100 |
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committer | Peter Maydell <peter.maydell@linaro.org> | 2015-09-24 01:29:36 +0100 |
commit | 4b3cfe72d9b9c53be31a88e7eebdda14f1757d3e (patch) | |
tree | 83c08a78208f17f4e41051f19e730d3a8b5d6e5b /hw/intc/arm_gic_kvm.c | |
parent | ff8f06ee7680fb505079d33caaf8f5ebff0853bc (diff) | |
download | hqemu-4b3cfe72d9b9c53be31a88e7eebdda14f1757d3e.zip hqemu-4b3cfe72d9b9c53be31a88e7eebdda14f1757d3e.tar.gz |
intc/gic: Extract some reusable vGIC code
Some functions previously used only by vGICv2 are useful also for vGICv3
implementation. Untie them from GICState and make accessible from within
other modules:
- kvm_arm_gic_set_irq()
- kvm_gic_supports_attr() - moved to common code and renamed to
kvm_device_check_attr()
- kvm_gic_access() - turned into GIC-independent kvm_device_access().
Data pointer changed to void * because some GICv3 registers are
64-bit wide
Some of these changes are not used right now, but they will be helpful for
implementing live migration.
Actually kvm_dist_get() and kvm_dist_put() could also be made reusable, but
they would require two extra parameters (s->dev_fd and s->num_cpu) as well as
lots of typecasts of 's' to DeviceState * and back to GICState *. This makes
the code very ugly so i decided to stop at this point. I tried also an
approach with making a base class for all possible GICs, but it would contain
only three variables (dev_fd, cpu_num and irq_num), and accessing them through
the rest of the code would be again tedious (either ugly casts or qemu-style
separate object pointer). So i disliked it too.
Signed-off-by: Pavel Fedin <p.fedin@samsung.com>
Tested-by: Ashok kumar <ashoks@broadcom.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 2ef56d1dd64ffb75ed02a10dcdaf605e5b8ff4f8.1441784344.git.p.fedin@samsung.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/intc/arm_gic_kvm.c')
-rw-r--r-- | hw/intc/arm_gic_kvm.c | 98 |
1 files changed, 33 insertions, 65 deletions
diff --git a/hw/intc/arm_gic_kvm.c b/hw/intc/arm_gic_kvm.c index e5d0f67..e8b2386 100644 --- a/hw/intc/arm_gic_kvm.c +++ b/hw/intc/arm_gic_kvm.c @@ -23,6 +23,7 @@ #include "sysemu/kvm.h" #include "kvm_arm.h" #include "gic_internal.h" +#include "vgic_common.h" //#define DEBUG_GIC_KVM @@ -52,7 +53,7 @@ typedef struct KVMARMGICClass { void (*parent_reset)(DeviceState *dev); } KVMARMGICClass; -static void kvm_arm_gic_set_irq(void *opaque, int irq, int level) +void kvm_arm_gic_set_irq(uint32_t num_irq, int irq, int level) { /* Meaning of the 'irq' parameter: * [0..N-1] : external interrupts @@ -63,10 +64,9 @@ static void kvm_arm_gic_set_irq(void *opaque, int irq, int level) * has separate fields in the irq number for type, * CPU number and interrupt number. */ - GICState *s = (GICState *)opaque; int kvm_irq, irqtype, cpu; - if (irq < (s->num_irq - GIC_INTERNAL)) { + if (irq < (num_irq - GIC_INTERNAL)) { /* External interrupt. The kernel numbers these like the GIC * hardware, with external interrupt IDs starting after the * internal ones. @@ -77,7 +77,7 @@ static void kvm_arm_gic_set_irq(void *opaque, int irq, int level) } else { /* Internal interrupt: decode into (cpu, interrupt id) */ irqtype = KVM_ARM_IRQ_TYPE_PPI; - irq -= (s->num_irq - GIC_INTERNAL); + irq -= (num_irq - GIC_INTERNAL); cpu = irq / GIC_INTERNAL; irq %= GIC_INTERNAL; } @@ -87,69 +87,36 @@ static void kvm_arm_gic_set_irq(void *opaque, int irq, int level) kvm_set_irq(kvm_state, kvm_irq, !!level); } -static bool kvm_arm_gic_can_save_restore(GICState *s) -{ - return s->dev_fd >= 0; -} - -static bool kvm_gic_supports_attr(GICState *s, int group, int attrnum) +static void kvm_arm_gicv2_set_irq(void *opaque, int irq, int level) { - struct kvm_device_attr attr = { - .group = group, - .attr = attrnum, - .flags = 0, - }; - - if (s->dev_fd == -1) { - return false; - } + GICState *s = (GICState *)opaque; - return kvm_device_ioctl(s->dev_fd, KVM_HAS_DEVICE_ATTR, &attr) == 0; + kvm_arm_gic_set_irq(s->num_irq, irq, level); } -static void kvm_gic_access(GICState *s, int group, int offset, - int cpu, uint32_t *val, bool write) +static bool kvm_arm_gic_can_save_restore(GICState *s) { - struct kvm_device_attr attr; - int type; - int err; - - cpu = cpu & 0xff; - - attr.flags = 0; - attr.group = group; - attr.attr = (((uint64_t)cpu << KVM_DEV_ARM_VGIC_CPUID_SHIFT) & - KVM_DEV_ARM_VGIC_CPUID_MASK) | - (((uint64_t)offset << KVM_DEV_ARM_VGIC_OFFSET_SHIFT) & - KVM_DEV_ARM_VGIC_OFFSET_MASK); - attr.addr = (uintptr_t)val; - - if (write) { - type = KVM_SET_DEVICE_ATTR; - } else { - type = KVM_GET_DEVICE_ATTR; - } - - err = kvm_device_ioctl(s->dev_fd, type, &attr); - if (err < 0) { - fprintf(stderr, "KVM_{SET/GET}_DEVICE_ATTR failed: %s\n", - strerror(-err)); - abort(); - } + return s->dev_fd >= 0; } +#define KVM_VGIC_ATTR(offset, cpu) \ + ((((uint64_t)(cpu) << KVM_DEV_ARM_VGIC_CPUID_SHIFT) & \ + KVM_DEV_ARM_VGIC_CPUID_MASK) | \ + (((uint64_t)(offset) << KVM_DEV_ARM_VGIC_OFFSET_SHIFT) & \ + KVM_DEV_ARM_VGIC_OFFSET_MASK)) + static void kvm_gicd_access(GICState *s, int offset, int cpu, uint32_t *val, bool write) { - kvm_gic_access(s, KVM_DEV_ARM_VGIC_GRP_DIST_REGS, - offset, cpu, val, write); + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_DIST_REGS, + KVM_VGIC_ATTR(offset, cpu), val, write); } static void kvm_gicc_access(GICState *s, int offset, int cpu, uint32_t *val, bool write) { - kvm_gic_access(s, KVM_DEV_ARM_VGIC_GRP_CPU_REGS, - offset, cpu, val, write); + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CPU_REGS, + KVM_VGIC_ATTR(offset, cpu), val, write); } #define for_each_irq_reg(_ctr, _max_irq, _field_width) \ @@ -559,7 +526,7 @@ static void kvm_arm_gic_realize(DeviceState *dev, Error **errp) return; } - gic_init_irqs_and_mmio(s, kvm_arm_gic_set_irq, NULL); + gic_init_irqs_and_mmio(s, kvm_arm_gicv2_set_irq, NULL); for (i = 0; i < s->num_irq - GIC_INTERNAL; i++) { qemu_irq irq = qdev_get_gpio_in(dev, i); @@ -571,23 +538,24 @@ static void kvm_arm_gic_realize(DeviceState *dev, Error **errp) ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_ARM_VGIC_V2, false); if (ret >= 0) { s->dev_fd = ret; + + /* Newstyle API is used, we may have attributes */ + if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0)) { + uint32_t numirqs = s->num_irq; + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, + &numirqs, true); + } + /* Tell the kernel to complete VGIC initialization now */ + if (kvm_device_check_attr(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, + KVM_DEV_ARM_VGIC_CTRL_INIT)) { + kvm_device_access(s->dev_fd, KVM_DEV_ARM_VGIC_GRP_CTRL, + KVM_DEV_ARM_VGIC_CTRL_INIT, NULL, true); + } } else if (ret != -ENODEV && ret != -ENOTSUP) { error_setg_errno(errp, -ret, "error creating in-kernel VGIC"); return; } - if (kvm_gic_supports_attr(s, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0)) { - uint32_t numirqs = s->num_irq; - kvm_gic_access(s, KVM_DEV_ARM_VGIC_GRP_NR_IRQS, 0, 0, &numirqs, 1); - } - - /* Tell the kernel to complete VGIC initialization now */ - if (kvm_gic_supports_attr(s, KVM_DEV_ARM_VGIC_GRP_CTRL, - KVM_DEV_ARM_VGIC_CTRL_INIT)) { - kvm_gic_access(s, KVM_DEV_ARM_VGIC_GRP_CTRL, - KVM_DEV_ARM_VGIC_CTRL_INIT, 0, 0, 1); - } - /* Distributor */ kvm_arm_register_device(&s->iomem, (KVM_ARM_DEVICE_VGIC_V2 << KVM_ARM_DEVICE_ID_SHIFT) |