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qemu-xen: free all the pirqs for msi/msix when driver unload 

Pirqs are not freed when driver unload, then new pirqs are allocated when
driver reload. This could exhaust pirqs if do it in a loop.

This patch fixes the bug by freeing pirqs when ENABLE bit is cleared in
msi/msix control reg.

There is also other way of fixing it such as reuse pirqs between driver reload,
but this way is better.
Xen-devel: http://marc.info/?l=xen-devel&m=136800120304275&w=2

Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Zhenzhong Duan 2014-05-07 13:41:48 +00:00 committed by Stefano Stabellini
parent fe680d0dac
commit c976437c7d
2 changed files with 8 additions and 4 deletions
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6
hw/xen/xen_pt_config_init.c
View File

@ -1123,8 +1123,8 @@ static int xen_pt_msgctrl_reg_write(XenPCIPassthroughState *s,
msi->mapped = true;
}
msi->flags |= PCI_MSI_FLAGS_ENABLE;
} else {
msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
} else if (msi->mapped) {
xen_pt_msi_disable(s);
}
/* pass through MSI_ENABLE bit */
@ -1397,6 +1397,8 @@ static int xen_pt_msixctrl_reg_write(XenPCIPassthroughState *s,
if ((*val & PCI_MSIX_FLAGS_ENABLE)
&& !(*val & PCI_MSIX_FLAGS_MASKALL)) {
xen_pt_msix_update(s);
} else if (!(*val & PCI_MSIX_FLAGS_ENABLE) && s->msix->enabled) {
xen_pt_msix_disable(s);
}
debug_msix_enabled_old = s->msix->enabled;

6
hw/xen/xen_pt_msi.c
View File

@ -282,7 +282,8 @@ void xen_pt_msi_disable(XenPCIPassthroughState *s)
msi->initialized);
/* clear msi info */
msi->flags = 0;
msi->flags &= ~PCI_MSI_FLAGS_ENABLE;
msi->initialized = false;
msi->mapped = false;
msi->pirq = XEN_PT_UNASSIGNED_PIRQ;
}
@ -446,7 +447,8 @@ static void pci_msix_write(void *opaque, hwaddr addr,
if (offset != PCI_MSIX_ENTRY_VECTOR_CTRL) {
const volatile uint32_t *vec_ctrl;
if (get_entry_value(entry, offset) == val) {
if (get_entry_value(entry, offset) == val
&& entry->pirq != XEN_PT_UNASSIGNED_PIRQ) {
return;
}