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qemu_pci_serial device locking/sync

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This commit is contained in:
Kamil Kowalczyk
2025-11-24 22:29:32 +01:00
parent 80a29d8ff6
commit cc2b96f37a
3 changed files with 83 additions and 2 deletions
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80
kernel/pci/qemu_pci_serial/qemu_pci_serial.c
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@ -6,6 +6,8 @@
#include "sysdefs/dev.h"
#include "util/util.h"
#include "dev/dev.h"
#include "cjob/cjob.h"
#include "proc/proc.h"
#include "errors.h"
#include "hshtb.h"
#include "kprintf.h"
@ -53,6 +55,11 @@ int32_t qemu_pci_serial_dev_sendb(struct Dev *dev, uint8_t *buffer, size_t len,
(void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
if (qpsd->lockstate != -1 && qpsd->lockstate != (int)pid) {
return E_DEVLOCKED;
}
_serial_sendb(qpsd->iobase, buffer[0]);
return E_OK;
@ -62,6 +69,10 @@ int32_t qemu_pci_serial_dev_sendready(struct Dev *dev, uint8_t *buffer, size_t l
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
if (qpsd->lockstate != -1 && qpsd->lockstate != (int)pid) {
return E_DEVLOCKED;
}
return _serial_sendready(qpsd->iobase);
}
@ -70,16 +81,75 @@ int32_t qemu_pci_serial_dev_recvb(struct Dev *dev, uint8_t *buffer, size_t len,
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
if (qpsd->lockstate != -1 && qpsd->lockstate != (int)pid) {
return E_DEVLOCKED;
}
return _serial_recvb(qpsd->iobase);
}
int32_t qemu_pci_serial_dev_recvready(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)dev; (void)buffer; (void)len; (void)pid;
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
if (qpsd->lockstate != -1 && qpsd->lockstate != (int)pid) {
return E_DEVLOCKED;
}
return _serial_recvready(qpsd->iobase);
}
int32_t qemu_pci_serial_dev_lock(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
return _serial_recvready(qpsd->iobase);
if (qpsd->lockstate == (int)pid) {
return E_OK;
}
if (qpsd->lockstate == -1) {
qpsd->lockstate = (int)pid;
return E_OK;
}
return E_DEVLOCKED;
}
int32_t qemu_pci_serial_dev_unlock(struct Dev *dev, uint8_t *buffer, size_t len, uint64_t pid) {
(void)buffer; (void)len; (void)pid;
QemuPciSerialDev *qpsd = dev->extra;
if (qpsd->lockstate == (int)pid) {
qpsd->lockstate = -1;
return E_OK;
}
return E_DEVNOTYOURLOCK;
}
void pci_qemu_pci_serial_gc_cjob(void *arg) {
Dev *dev = arg;
QemuPciSerialDev *qpsd;
spinlock_acquire(&dev->spinlock);
qpsd = dev->extra;
uint64_t pid = qpsd->lockstate;
spinlock_release(&dev->spinlock);
Proc *proc = NULL;
spinlock_acquire(&PROCS.spinlock);
LL_FINDPROP(PROCS.procs, proc, pid, pid);
spinlock_release(&PROCS.spinlock);
if (proc == NULL) {
spinlock_acquire(&dev->spinlock);
qpsd = dev->extra;
qpsd->lockstate = -1;
spinlock_release(&dev->spinlock);
}
}
void pci_qemu_pci_serial_init(void) {
@ -97,6 +167,7 @@ void pci_qemu_pci_serial_init(void) {
QEMU_PCI_SERIAL_DEV._magic = QEMU_PCI_SERIAL_MAGIC;
QEMU_PCI_SERIAL_DEV.iobase = iobase;
QEMU_PCI_SERIAL_DEV.lockstate = -1;
Dev *serialdev = NULL;
HSHTB_ALLOC(DEVTABLE.devs, ident, "serialdev", serialdev);
@ -104,8 +175,13 @@ void pci_qemu_pci_serial_init(void) {
serialdev->fns[1] = &qemu_pci_serial_dev_sendready;
serialdev->fns[2] = &qemu_pci_serial_dev_recvb;
serialdev->fns[3] = &qemu_pci_serial_dev_recvready;
serialdev->fns[4] = &qemu_pci_serial_dev_lock;
serialdev->fns[5] = &qemu_pci_serial_dev_unlock;
spinlock_init(&serialdev->spinlock);
serialdev->extra = &QEMU_PCI_SERIAL_DEV;
cjob_register(&pci_qemu_pci_serial_gc_cjob, serialdev);
_serial_init(QEMU_PCI_SERIAL_DEV.iobase);
}