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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>
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/* | ||
* ARM KVM vGIC utility functions | ||
* | ||
* Copyright (c) 2015 Samsung Electronics | ||
* Written by Pavel Fedin | ||
* | ||
* This program is free software; you can redistribute it and/or modify | ||
* it under the terms of the GNU General Public License as published by | ||
* the Free Software Foundation, either version 2 of the License, or | ||
* (at your option) any later version. | ||
* | ||
* This program is distributed in the hope that it will be useful, | ||
* but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
* GNU General Public License for more details. | ||
* | ||
* You should have received a copy of the GNU General Public License along | ||
* with this program; if not, see <http://www.gnu.org/licenses/>. | ||
*/ | ||
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#ifndef QEMU_ARM_VGIC_COMMON_H | ||
#define QEMU_ARM_VGIC_COMMON_H | ||
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/** | ||
* kvm_arm_gic_set_irq - Send an IRQ to the in-kernel vGIC | ||
* @num_irq: Total number of IRQs configured for the GIC instance | ||
* @irq: qemu internal IRQ line number: | ||
* [0..N-1] : external interrupts | ||
* [N..N+31] : PPI (internal) interrupts for CPU 0 | ||
* [N+32..N+63] : PPI (internal interrupts for CPU 1 | ||
* @level: level of the IRQ line. | ||
*/ | ||
void kvm_arm_gic_set_irq(uint32_t num_irq, int irq, int level); | ||
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#endif |
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