On 2015/3/26 19:37, Michael S. Tsirkin wrote:
> pci_msi_init_pci_dev and pci_msi_off share a lot of code.
> This used to be justified since pci_msi_init_pci_dev
> wasn't compiled in when CONFIG_PCI_MSI is off.
> Now that it is, let's reuse code.
It's not correct, pci_msi_off() would be used in quirk when the msi_cap is not
initialized.
For example:
/*
* It's possible for the MSI to get corrupted if shpc and acpi
* are used together on certain PXH-based systems.
*/
static void quirk_pcie_pxh(struct pci_dev *dev)
{
pci_msi_off(dev);
dev->no_msi = 1;
dev_warn(&dev->dev, "PXH quirk detected; SHPC device MSI disabled\n");
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_PXHD_0,
quirk_pcie_pxh);
>
> Signed-off-by: Michael S. Tsirkin <m...@redhat.com>
> ---
> drivers/pci/pci.c | 23 ++++-------------------
> drivers/pci/probe.c | 11 ++++-------
> 2 files changed, 8 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 81f06e8..fcee8ea 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -3106,26 +3106,11 @@ EXPORT_SYMBOL_GPL(pci_check_and_unmask_intx);
> */
> void pci_msi_off(struct pci_dev *dev)
> {
> - int pos;
> - u16 control;
> + if (dev->msi_cap)
> + pci_msi_set_enable(dev, 0);
>
> - /*
> - * This looks like it could go in msi.c, but we need it even when
> - * CONFIG_PCI_MSI=n. For the same reason, we can't use
> - * dev->msi_cap or dev->msix_cap here.
> - */
> - pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
> - if (pos) {
> - pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &control);
> - control &= ~PCI_MSI_FLAGS_ENABLE;
> - pci_write_config_word(dev, pos + PCI_MSI_FLAGS, control);
> - }
> - pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> - if (pos) {
> - pci_read_config_word(dev, pos + PCI_MSIX_FLAGS, &control);
> - control &= ~PCI_MSIX_FLAGS_ENABLE;
> - pci_write_config_word(dev, pos + PCI_MSIX_FLAGS, control);
> - }
> + if (dev->msix_cap)
> + pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
> }
> EXPORT_SYMBOL_GPL(pci_msi_off);
>
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 45d6d5c..baf8ddd 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -1489,17 +1489,14 @@ static void pci_msi_init_pci_dev(struct pci_dev *dev)
> INIT_LIST_HEAD(&dev->msi_list);
> #endif
>
> + dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
> + dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> +
> /* Disable the msi hardware to avoid screaming interrupts
> * during boot. This is the power on reset default so
> * usually this should be a noop.
> */
> - dev->msi_cap = pci_find_capability(dev, PCI_CAP_ID_MSI);
> - if (dev->msi_cap)
> - pci_msi_set_enable(dev, 0);
> -
> - dev->msix_cap = pci_find_capability(dev, PCI_CAP_ID_MSIX);
> - if (dev->msix_cap)
> - pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
> + pci_msi_off(dev);
> }
>
> static void pci_init_capabilities(struct pci_dev *dev)
>
--
Thanks!
Yijing
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