57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
|
/*
|
||
|
|
* QEMU PowerPC sPAPR IRQ interface
|
||
|
|
*
|
||
|
|
* Copyright (c) 2018, IBM Corporation.
|
||
|
|
*
|
||
|
|
* This code is licensed under the GPL version 2 or later. See the
|
||
|
|
* COPYING file in the top-level directory.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "qemu/osdep.h"
|
||
|
|
#include "qemu/log.h"
|
||
|
|
#include "qemu/error-report.h"
|
||
|
|
#include "qapi/error.h"
|
||
|
|
#include "hw/ppc/spapr.h"
|
||
|
|
#include "hw/ppc/xics.h"
|
||
|
|
|
||
|
|
void spapr_irq_msi_init(sPAPRMachineState *spapr, uint32_t nr_msis)
|
||
|
|
{
|
||
|
|
spapr->irq_map_nr = nr_msis;
|
||
|
|
spapr->irq_map = bitmap_new(spapr->irq_map_nr);
|
||
|
|
}
|
||
|
|
|
||
|
|
int spapr_irq_msi_alloc(sPAPRMachineState *spapr, uint32_t num, bool align,
|
||
|
|
Error **errp)
|
||
|
|
{
|
||
|
|
int irq;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* The 'align_mask' parameter of bitmap_find_next_zero_area()
|
||
|
|
* should be one less than a power of 2; 0 means no
|
||
|
|
* alignment. Adapt the 'align' value of the former allocator
|
||
|
|
* to fit the requirements of bitmap_find_next_zero_area()
|
||
|
|
*/
|
||
|
|
align -= 1;
|
||
|
|
|
||
|
|
irq = bitmap_find_next_zero_area(spapr->irq_map, spapr->irq_map_nr, 0, num,
|
||
|
|
align);
|
||
|
|
if (irq == spapr->irq_map_nr) {
|
||
|
|
error_setg(errp, "can't find a free %d-IRQ block", num);
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
bitmap_set(spapr->irq_map, irq, num);
|
||
|
|
|
||
|
|
return irq + SPAPR_IRQ_MSI;
|
||
|
|
}
|
||
|
|
|
||
|
|
void spapr_irq_msi_free(sPAPRMachineState *spapr, int irq, uint32_t num)
|
||
|
|
{
|
||
|
|
bitmap_clear(spapr->irq_map, irq - SPAPR_IRQ_MSI, num);
|
||
|
|
}
|
||
|
|
|
||
|
|
void spapr_irq_msi_reset(sPAPRMachineState *spapr)
|
||
|
|
{
|
||
|
|
bitmap_clear(spapr->irq_map, 0, spapr->irq_map_nr);
|
||
|
|
}
|