[patch V2 19/19] PCI/MSI: Use new mask/unmask functions

Thomas Gleixner
2021-07-29T22:35:49Z

Switch the PCI/MSI core to use the new mask/unmask functions. No functional
change.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: New patch
---
drivers/pci/msi.c | 102 +++++++++++-------------------------------------------
1 file changed, 21 insertions(+), 81 deletions(-)

--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -135,74 +135,6 @@ void __weak arch_restore_msi_irqs(struct
* reliably as devices without an INTx disable bit will then generate a
* level IRQ which will never be cleared.
*/
-static void __pci_msi_desc_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
-{
- raw_spinlock_t *lock = &desc->dev->msi_lock;
- unsigned long flags;
-
- if (pci_msi_ignore_mask || !desc->msi_attrib.maskbit)
- return;
-
- raw_spin_lock_irqsave(lock, flags);
- desc->msi_mask &= ~mask;
- desc->msi_mask |= flag;
- pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->mask_pos,
- desc->msi_mask);
- raw_spin_unlock_irqrestore(lock, flags);
-}
-
-static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
-{
- __pci_msi_desc_mask_irq(desc, mask, flag);
-}
-
-static void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
-{
- return desc->mask_base + desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
-}
-
-/*
- * This internal function does not flush PCI writes to the device.
- * All users must ensure that they read from the device before either
- * assuming that the device state is up to date, or returning out of this
- * file. This saves a few milliseconds when initialising devices with lots
- * of MSI-X interrupts.
- */
-static u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag)
-{
- void __iomem *desc_addr = pci_msix_desc_addr(desc);
- u32 ctrl = desc->msix_ctrl;
-
- if (pci_msi_ignore_mask || desc->msi_attrib.is_virtual)
- return 0;
-
- ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
- if (ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)
- ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
-
- writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
-
- return ctrl;
-}
-
-static void msix_mask_irq(struct msi_desc *desc, u32 flag)
-{
- desc->msix_ctrl = __pci_msix_desc_mask_irq(desc, flag);
-}
-
-static void msi_set_mask_bit(struct irq_data *data, u32 flag)
-{
- struct msi_desc *desc = irq_data_get_msi_desc(data);
-
- if (desc->msi_attrib.is_msix) {
- msix_mask_irq(desc, flag);
- readl(desc->mask_base); /* Flush write to device */
- } else {
- unsigned offset = data->irq - desc->irq;
- msi_mask_irq(desc, 1 << offset, flag << offset);
- }
-}
-
static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
{
/* Don't shift by >= width of type */
@@ -234,6 +166,11 @@ static inline void pci_msi_unmask(struct
pci_msi_update_mask(desc, mask, 0);
}

+static inline void __iomem *pci_msix_desc_addr(struct msi_desc *desc)
+{
+ return desc->mask_base + desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE;
+}
+
/*
* This internal function does not flush PCI writes to the device. All
* users must ensure that they read from the device before either assuming
@@ -289,7 +226,9 @@ static void __pci_msi_unmask_desc(struct
*/
void pci_msi_mask_irq(struct irq_data *data)
{
- msi_set_mask_bit(data, 1);
+ struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+ __pci_msi_mask_desc(desc, BIT(data->irq - desc->irq));
}
EXPORT_SYMBOL_GPL(pci_msi_mask_irq);

@@ -299,7 +238,9 @@ EXPORT_SYMBOL_GPL(pci_msi_mask_irq);
*/
void pci_msi_unmask_irq(struct irq_data *data)
{
- msi_set_mask_bit(data, 0);
+ struct msi_desc *desc = irq_data_get_msi_desc(data);
+
+ __pci_msi_unmask_desc(desc, BIT(data->irq - desc->irq));
}
EXPORT_SYMBOL_GPL(pci_msi_unmask_irq);

@@ -352,7 +293,8 @@ void __pci_write_msi_msg(struct msi_desc
/* Don't touch the hardware now */
} else if (entry->msi_attrib.is_msix) {
void __iomem *base = pci_msix_desc_addr(entry);
- bool unmasked = !(entry->msix_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);
+ u32 ctrl = entry->msix_ctrl;
+ bool unmasked = !(ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);

if (entry->msi_attrib.is_virtual)
goto skip;
@@ -366,14 +308,14 @@ void __pci_write_msi_msg(struct msi_desc
* undefined."
*/
if (unmasked)
- __pci_msix_desc_mask_irq(entry, PCI_MSIX_ENTRY_CTRL_MASKBIT);
+ 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_desc_mask_irq(entry, 0);
+ pci_msix_write_vector_ctrl(entry, ctrl);

/* Ensure that the writes are visible in the device */
readl(base + PCI_MSIX_ENTRY_DATA);
@@ -491,7 +433,7 @@ static void __pci_restore_msi_state(stru
arch_restore_msi_irqs(dev);

pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
- msi_mask_irq(entry, msi_multi_mask(entry), entry->msi_mask);
+ pci_msi_update_mask(entry, 0, 0);
control &= ~PCI_MSI_FLAGS_QSIZE;
control |= (entry->msi_attrib.multiple << 4) | PCI_MSI_FLAGS_ENABLE;
pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, control);
@@ -522,7 +464,7 @@ static void __pci_restore_msix_state(str

arch_restore_msi_irqs(dev);
for_each_pci_msi_entry(entry, dev)
- msix_mask_irq(entry, entry->msix_ctrl);
+ pci_msix_write_vector_ctrl(entry, entry->msix_ctrl);

pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
}
@@ -704,7 +646,6 @@ static int msi_capability_init(struct pc
{
struct msi_desc *entry;
int ret;
- unsigned mask;

pci_msi_set_enable(dev, 0); /* Disable MSI during set up */

@@ -713,8 +654,7 @@ static int msi_capability_init(struct pc
return -ENOMEM;

/* All MSIs are unmasked by default; mask them all */
- mask = msi_multi_mask(entry);
- msi_mask_irq(entry, mask, mask);
+ pci_msi_mask(entry, msi_multi_mask(entry));

list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));

@@ -741,7 +681,7 @@ static int msi_capability_init(struct pc
return 0;

err:
- msi_mask_irq(entry, mask, 0);
+ pci_msi_unmask(entry, msi_multi_mask(entry));
free_msi_irqs(dev);
return ret;
}
@@ -1021,7 +961,7 @@ static void pci_msi_shutdown(struct pci_
dev->msi_enabled = 0;

/* Return the device with MSI unmasked as initial states */
- msi_mask_irq(desc, msi_multi_mask(desc), 0);
+ pci_msi_unmask(desc, msi_multi_mask(desc));

/* Restore dev->irq to its default pin-assertion IRQ */
dev->irq = desc->msi_attrib.default_irq;
@@ -1107,7 +1047,7 @@ static void pci_msix_shutdown(struct pci

/* Return the device with MSI-X masked as initial states */
for_each_pci_msi_entry(entry, dev)
- __pci_msix_desc_mask_irq(entry, 1);
+ pci_msix_mask(entry);

pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_ENABLE, 0);
pci_intx_for_msi(dev, 1);