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8a4989f526
In some adhoc profiling booting Linux VMs, it's observed that ahci_irq_lower() can be a hot path (10000+ triggers until login prompt appears). Even though the parent device never changes, this method re-determines whether the parent device is a PCI device or not using the rather expensive object_dynamic_cast() function. Avoid this overhead by pushing the interrupt handling to the parent device, essentially turning AHCIState into an "IP block". Note that this change also frees AHCIState from the PCI dependency which wasn't reflected in Kconfig. Reported-by: Peter Xu <peterx@redhat.com> Inspired-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Bernhard Beschow <shentey@gmail.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Message-ID: <20241212110926.23548-2-shentey@gmail.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*
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* QEMU AHCI Emulation
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*
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* Copyright (c) 2010 qiaochong@loongson.cn
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* Copyright (c) 2010 Roland Elek <elek.roland@gmail.com>
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* Copyright (c) 2010 Sebastian Herbszt <herbszt@gmx.de>
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* Copyright (c) 2010 Alexander Graf <agraf@suse.de>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef HW_IDE_AHCI_H
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#define HW_IDE_AHCI_H
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#include "exec/memory.h"
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typedef struct AHCIDevice AHCIDevice;
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typedef struct AHCIControlRegs {
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uint32_t cap;
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uint32_t ghc;
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uint32_t irqstatus;
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uint32_t impl;
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uint32_t version;
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} AHCIControlRegs;
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typedef struct AHCIState {
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AHCIDevice *dev;
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AHCIControlRegs control_regs;
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MemoryRegion mem;
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MemoryRegion idp; /* Index-Data Pair I/O port space */
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unsigned idp_offset; /* Offset of index in I/O port space */
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uint32_t idp_index; /* Current IDP index */
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uint32_t ports;
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qemu_irq irq;
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AddressSpace *as;
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} AHCIState;
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void ahci_ide_create_devs(AHCIState *ahci, DriveInfo **hd);
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#endif /* HW_IDE_AHCI_H */
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