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// SPDX-License-Identifier: GPL-2.0
#include "kvm_util.h"
#include "test_util.h"
#include "proc_util.h"
static FILE *open_proc_interrupts(void)
{
FILE *fp;
fp = fopen("/proc/interrupts", "r");
TEST_ASSERT(fp, "fopen(/proc/interrupts) failed");
return fp;
}
unsigned int vfio_msix_to_host_irq(const char *device_bdf, int msix)
{
char search_string[64];
char line[4096];
int irq = -1;
FILE *fp;
fp = open_proc_interrupts();
snprintf(search_string, sizeof(search_string), "vfio-msix[%d]", msix);
while (fgets(line, sizeof(line), fp)) {
if (strstr(line, device_bdf) && strstr(line, search_string)) {
TEST_ASSERT_EQ(1, sscanf(line, "%d:", &irq));
break;
}
}
fclose(fp);
TEST_ASSERT(irq != -1, "Failed to locate IRQ for %s %s", device_bdf,
search_string);
return (unsigned int)irq;
}
void proc_irq_set_smp_affinity(unsigned int irq, int cpu)
{
char path[PATH_MAX];
int r, fd;
snprintf(path, sizeof(path), "/proc/irq/%u/smp_affinity_list", irq);
fd = open(path, O_RDWR);
TEST_ASSERT(fd >= 0, "Failed to open %s", path);
r = dprintf(fd, "%d\n", cpu);
TEST_ASSERT(r > 0, "Failed to affinitize IRQ-%u to CPU %d", irq, cpu);
kvm_close(fd);
}
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