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authorMarek Marczykowski-Górecki <marmarek@invisiblethingslab.com>2023-10-16 16:13:25 +0300
committerJuergen Gross <jgross@suse.com>2023-10-16 16:20:31 +0300
commit2c269f42d0f382743ab230308b836ffe5ae9b2ae (patch)
tree7608a31e6b3b56b653fc0f417cc6bf83ba9b71b0 /drivers/xen
parentf0d7db7b33243d2aeeff14dbdde4ccc0687ef257 (diff)
downloadlinux-2c269f42d0f382743ab230308b836ffe5ae9b2ae.tar.xz
xen-pciback: Consider INTx disabled when MSI/MSI-X is enabled
Linux enables MSI-X before disabling INTx, but keeps MSI-X masked until the table is filled. Then it disables INTx just before clearing MASKALL bit. Currently this approach is rejected by xen-pciback. According to the PCIe spec, device cannot use INTx when MSI/MSI-X is enabled (in other words: enabling MSI/MSI-X implicitly disables INTx). Change the logic to consider INTx disabled if MSI/MSI-X is enabled. This applies to three places: - checking currently enabled interrupts type, - transition to MSI/MSI-X - where INTx would be implicitly disabled, - clearing INTx disable bit - which can be allowed even if MSI/MSI-X is enabled, as device should consider INTx disabled anyway in that case Fixes: 5e29500eba2a ("xen-pciback: Allow setting PCI_MSIX_FLAGS_MASKALL too") Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com> Acked-by: Juergen Gross <jgross@suse.com> Link: https://lore.kernel.org/r/20231016131348.1734721-1-marmarek@invisiblethingslab.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'drivers/xen')
-rw-r--r--drivers/xen/xen-pciback/conf_space.c19
-rw-r--r--drivers/xen/xen-pciback/conf_space_capability.c8
-rw-r--r--drivers/xen/xen-pciback/conf_space_header.c21
3 files changed, 23 insertions, 25 deletions
diff --git a/drivers/xen/xen-pciback/conf_space.c b/drivers/xen/xen-pciback/conf_space.c
index 059de92aea7d..d47eee6c5143 100644
--- a/drivers/xen/xen-pciback/conf_space.c
+++ b/drivers/xen/xen-pciback/conf_space.c
@@ -288,12 +288,6 @@ int xen_pcibk_get_interrupt_type(struct pci_dev *dev)
u16 val;
int ret = 0;
- err = pci_read_config_word(dev, PCI_COMMAND, &val);
- if (err)
- return err;
- if (!(val & PCI_COMMAND_INTX_DISABLE))
- ret |= INTERRUPT_TYPE_INTX;
-
/*
* Do not trust dev->msi(x)_enabled here, as enabling could be done
* bypassing the pci_*msi* functions, by the qemu.
@@ -316,6 +310,19 @@ int xen_pcibk_get_interrupt_type(struct pci_dev *dev)
if (val & PCI_MSIX_FLAGS_ENABLE)
ret |= INTERRUPT_TYPE_MSIX;
}
+
+ /*
+ * PCIe spec says device cannot use INTx if MSI/MSI-X is enabled,
+ * so check for INTx only when both are disabled.
+ */
+ if (!ret) {
+ err = pci_read_config_word(dev, PCI_COMMAND, &val);
+ if (err)
+ return err;
+ if (!(val & PCI_COMMAND_INTX_DISABLE))
+ ret |= INTERRUPT_TYPE_INTX;
+ }
+
return ret ?: INTERRUPT_TYPE_NONE;
}
diff --git a/drivers/xen/xen-pciback/conf_space_capability.c b/drivers/xen/xen-pciback/conf_space_capability.c
index 097316a74126..1948a9700c8f 100644
--- a/drivers/xen/xen-pciback/conf_space_capability.c
+++ b/drivers/xen/xen-pciback/conf_space_capability.c
@@ -236,10 +236,16 @@ static int msi_msix_flags_write(struct pci_dev *dev, int offset, u16 new_value,
return PCIBIOS_SET_FAILED;
if (new_value & field_config->enable_bit) {
- /* don't allow enabling together with other interrupt types */
+ /*
+ * Don't allow enabling together with other interrupt type, but do
+ * allow enabling MSI(-X) while INTx is still active to please Linuxes
+ * MSI(-X) startup sequence. It is safe to do, as according to PCI
+ * spec, device with enabled MSI(-X) shouldn't use INTx.
+ */
int int_type = xen_pcibk_get_interrupt_type(dev);
if (int_type == INTERRUPT_TYPE_NONE ||
+ int_type == INTERRUPT_TYPE_INTX ||
int_type == field_config->int_type)
goto write;
return PCIBIOS_SET_FAILED;
diff --git a/drivers/xen/xen-pciback/conf_space_header.c b/drivers/xen/xen-pciback/conf_space_header.c
index 981435103af1..fc0332645966 100644
--- a/drivers/xen/xen-pciback/conf_space_header.c
+++ b/drivers/xen/xen-pciback/conf_space_header.c
@@ -104,24 +104,9 @@ static int command_write(struct pci_dev *dev, int offset, u16 value, void *data)
pci_clear_mwi(dev);
}
- if (dev_data && dev_data->allow_interrupt_control) {
- if ((cmd->val ^ value) & PCI_COMMAND_INTX_DISABLE) {
- if (value & PCI_COMMAND_INTX_DISABLE) {
- pci_intx(dev, 0);
- } else {
- /* Do not allow enabling INTx together with MSI or MSI-X. */
- switch (xen_pcibk_get_interrupt_type(dev)) {
- case INTERRUPT_TYPE_NONE:
- pci_intx(dev, 1);
- break;
- case INTERRUPT_TYPE_INTX:
- break;
- default:
- return PCIBIOS_SET_FAILED;
- }
- }
- }
- }
+ if (dev_data && dev_data->allow_interrupt_control &&
+ ((cmd->val ^ value) & PCI_COMMAND_INTX_DISABLE))
+ pci_intx(dev, !(value & PCI_COMMAND_INTX_DISABLE));
cmd->val = value;