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ACRN/DM: Reset the passthrough device to fix garbage display issue

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Currently the DM will return the passthrough device to SOS when the DM
needs to be terminated. But the device is not reset. In such case it
will cause the garbage display issue when the GPU passthrough device
is used.

Tracked-On: #4719
Signed-off-by: Zhao Yakui <yakui.zhao@intel.com>
This commit is contained in:
Zhao Yakui 2020-04-27 11:33:21 +08:00 committed by wenlingz
parent 77b7721fd0
commit 440385d53f
1 changed files with 22 additions and 0 deletions
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22
devicemodel/hw/pci/passthrough.c
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@ -569,6 +569,9 @@ passthru_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
struct passthru_dev *ptdev;
uint16_t virt_bdf = PCI_BDF(dev->bus, dev->slot, dev->func);
struct acrn_assign_pcidev pcidev = {};
uint16_t phys_bdf = 0;
char reset_path[60];
int fd;
if (!dev->arg) {
warnx("%s: passthru_dev is NULL", __func__);
@ -583,6 +586,9 @@ passthru_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
vm_reset_ptdev_intx_info(ctx, virt_bdf, ptdev->phys_bdf, dev->lintr.ioapic_irq, false);
}
if (ptdev)
phys_bdf = ptdev->phys_bdf;
if (ptdev->phys_bdf == PCI_BDF_GPU) {
vm_unmap_ptdev_mmio(ctx, 0, 2, 0, GPU_GSM_GPA, GPU_GSM_SIZE, gsm_start_hpa);
vm_unmap_ptdev_mmio(ctx, 0, 2, 0, GPU_OPREGION_GPA, GPU_OPREGION_SIZE, opregion_start_hpa);
@ -599,6 +605,22 @@ passthru_deinit(struct vmctx *ctx, struct pci_vdev *dev, char *opts)
*/
vm_deassign_pcidev(ctx, &pcidev);
}
if (!is_rtvm && phys_bdf) {
memset(reset_path, 0, sizeof(reset_path));
snprintf(reset_path, 40,
"/sys/bus/pci/devices/0000:%02x:%02x.%x/reset",
(phys_bdf >> 8) & 0xFF,
(phys_bdf >> 3) & 0x1F,
(phys_bdf & 0x7));
fd = open(reset_path, O_WRONLY);
if (fd >= 0) {
if (write(fd, "1", 1) < 0)
warnx("reset dev %x failed!\n",
phys_bdf);
close(fd);
}
}
}
/* bind pin info for pass-through device */