[patch V2 10/33] PCI/MSI: Split __pci_write_msi_msg()

Thomas Gleixner
2022-11-21T14:38:56Z

The upcoming per device MSI domains will create different domains for MSI
and MSI-X. Split the write message function into MSI and MSI-X helpers so
they can be used by those new domain functions seperately.

Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
---
drivers/pci/msi/msi.c | 104 +++++++++++++++++++++++++-------------------------
1 file changed, 54 insertions(+), 50 deletions(-)

--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -180,6 +180,58 @@ void __pci_read_msi_msg(struct msi_desc
}
}

+static inline void pci_write_msg_msi(struct pci_dev *dev, struct msi_desc *desc,
+ struct msi_msg *msg)
+{
+ int pos = dev->msi_cap;
+ u16 msgctl;
+
+ pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
+ msgctl &= ~PCI_MSI_FLAGS_QSIZE;
+ msgctl |= desc->pci.msi_attrib.multiple << 4;
+ pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);
+
+ pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO, msg->address_lo);
+ if (desc->pci.msi_attrib.is_64) {
+ pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI, msg->address_hi);
+ pci_write_config_word(dev, pos + PCI_MSI_DATA_64, msg->data);
+ } else {
+ pci_write_config_word(dev, pos + PCI_MSI_DATA_32, msg->data);
+ }
+ /* Ensure that the writes are visible in the device */
+ pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
+}
+
+static inline void pci_write_msg_msix(struct msi_desc *desc, struct msi_msg *msg)
+{
+ void __iomem *base = pci_msix_desc_addr(desc);
+ u32 ctrl = desc->pci.msix_ctrl;
+ bool unmasked = !(ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);
+
+ if (desc->pci.msi_attrib.is_virtual)
+ return;
+ /*
+ * The specification mandates that the entry is masked
+ * when the message is modified:
+ *
+ * "If software changes the Address or Data value of an
+ * entry while the entry is unmasked, the result is
+ * undefined."
+ */
+ if (unmasked)
+ pci_msix_write_vector_ctrl(desc, ctrl | PCI_MSIX_ENTRY_CTRL_MASKBIT);
+
+ writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
+ writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
+ writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
+
+ if (unmasked)
+ pci_msix_write_vector_ctrl(desc, ctrl);
+
+ /* Ensure that the writes are visible in the device */
+ readl(base + PCI_MSIX_ENTRY_DATA);
+}
+
void __pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
struct pci_dev *dev = msi_desc_to_pci_dev(entry);
@@ -187,63 +239,15 @@ void __pci_write_msi_msg(struct msi_desc
if (dev->current_state != PCI_D0 || pci_dev_is_disconnected(dev)) {
/* Don't touch the hardware now */
} else if (entry->pci.msi_attrib.is_msix) {
- void __iomem *base = pci_msix_desc_addr(entry);
- u32 ctrl = entry->pci.msix_ctrl;
- bool unmasked = !(ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);
-
- if (entry->pci.msi_attrib.is_virtual)
- goto skip;
-
- /*
- * The specification mandates that the entry is masked
- * when the message is modified:
- *
- * "If software changes the Address or Data value of an
- * entry while the entry is unmasked, the result is
- * undefined."
- */
- if (unmasked)
- pci_msix_write_vector_ctrl(entry, ctrl | PCI_MSIX_ENTRY_CTRL_MASKBIT);
-
- writel(msg->address_lo, base + PCI_MSIX_ENTRY_LOWER_ADDR);
- writel(msg->address_hi, base + PCI_MSIX_ENTRY_UPPER_ADDR);
- writel(msg->data, base + PCI_MSIX_ENTRY_DATA);
-
- if (unmasked)
- pci_msix_write_vector_ctrl(entry, ctrl);
-
- /* Ensure that the writes are visible in the device */
- readl(base + PCI_MSIX_ENTRY_DATA);
+ pci_write_msg_msix(entry, msg);
} else {
- int pos = dev->msi_cap;
- u16 msgctl;
-
- pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
- msgctl &= ~PCI_MSI_FLAGS_QSIZE;
- msgctl |= entry->pci.msi_attrib.multiple << 4;
- pci_write_config_word(dev, pos + PCI_MSI_FLAGS, msgctl);
-
- pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_LO,
- msg->address_lo);
- if (entry->pci.msi_attrib.is_64) {
- pci_write_config_dword(dev, pos + PCI_MSI_ADDRESS_HI,
- msg->address_hi);
- pci_write_config_word(dev, pos + PCI_MSI_DATA_64,
- msg->data);
- } else {
- pci_write_config_word(dev, pos + PCI_MSI_DATA_32,
- msg->data);
- }
- /* Ensure that the writes are visible in the device */
- pci_read_config_word(dev, pos + PCI_MSI_FLAGS, &msgctl);
+ pci_write_msg_msi(dev, entry, msg);
}

-skip:
entry->msg = *msg;

if (entry->write_msi_msg)
entry->write_msi_msg(entry, entry->write_msi_msg_data);
-
}

void pci_write_msi_msg(unsigned int irq, struct msi_msg *msg)