[patch V2 14/19] PCI/MSI: Rename msi_desc::masked

Thomas Gleixner
2021-07-29T22:35:32Z

msi_desc::masked is a misnomer. For MSI it's used to cache the MSI mask
bits when the device supports per vector masking. For MSI-X it's used to
cache the content of the vector control word which contains the mask bit
for the vector.

Replace it with a union of msi_mask and msix_ctrl to make the purpose clear
and fix up the usage sites.

No functional change

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: New patch
---
drivers/pci/msi.c | 30 +++++++++++++++---------------
include/linux/msi.h | 8 ++++++--
2 files changed, 21 insertions(+), 17 deletions(-)

--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -152,10 +152,10 @@ static void __pci_msi_desc_mask_irq(stru
return;

raw_spin_lock_irqsave(lock, flags);
- desc->masked &= ~mask;
- desc->masked |= flag;
+ desc->msi_mask &= ~mask;
+ desc->msi_mask |= flag;
pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->mask_pos,
- desc->masked);
+ desc->msi_mask);
raw_spin_unlock_irqrestore(lock, flags);
}

@@ -182,7 +182,7 @@ static void __iomem *pci_msix_desc_addr(
*/
static u32 __pci_msix_desc_mask_irq(struct msi_desc *desc, u32 flag)
{
- u32 mask_bits = desc->masked;
+ u32 ctrl = desc->msix_ctrl;
void __iomem *desc_addr;

if (pci_msi_ignore_mask)
@@ -192,18 +192,18 @@ static u32 __pci_msix_desc_mask_irq(stru
if (!desc_addr)
return 0;

- mask_bits &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
- if (flag & PCI_MSIX_ENTRY_CTRL_MASKBIT)
- mask_bits |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
+ ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
+ if (ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT)
+ ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;

- writel(mask_bits, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
+ writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);

- return mask_bits;
+ return ctrl;
}

static void msix_mask_irq(struct msi_desc *desc, u32 flag)
{
- desc->masked = __pci_msix_desc_mask_irq(desc, flag);
+ desc->msix_ctrl = __pci_msix_desc_mask_irq(desc, flag);
}

static void msi_set_mask_bit(struct irq_data *data, u32 flag)
@@ -290,7 +290,7 @@ 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->masked & PCI_MSIX_ENTRY_CTRL_MASKBIT);
+ bool unmasked = !(entry->msix_ctrl & PCI_MSIX_ENTRY_CTRL_MASKBIT);

if (!base)
goto skip;
@@ -430,7 +430,7 @@ static void __pci_restore_msi_state(stru

pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
msi_mask_irq(entry, msi_mask(entry->msi_attrib.multi_cap),
- entry->masked);
+ entry->msi_mask);
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);
@@ -461,7 +461,7 @@ static void __pci_restore_msix_state(str

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

pci_msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
}
@@ -602,7 +602,7 @@ msi_setup_entry(struct pci_dev *dev, int

/* Save the initial mask status */
if (entry->msi_attrib.maskbit)
- pci_read_config_dword(dev, entry->mask_pos, &entry->masked);
+ pci_read_config_dword(dev, entry->mask_pos, &entry->msi_mask);

out:
kfree(masks);
@@ -750,7 +750,7 @@ static int msix_setup_entries(struct pci

addr = pci_msix_desc_addr(entry);
if (addr)
- entry->masked = readl(addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
+ entry->msix_ctrl = readl(addr + PCI_MSIX_ENTRY_VECTOR_CTRL);

list_add_tail(&entry->list, dev_to_msi_list(&dev->dev));
if (masks)
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -107,7 +107,8 @@ struct ti_sci_inta_msi_desc {
* address or data changes
* @write_msi_msg_data: Data parameter for the callback.
*
- * @masked: [PCI MSI/X] Mask bits
+ * @msi_mask: [PCI MSI] MSI cached mask bits
+ * @msix_ctrl: [PCI MSI-X] MSI-X cached per vector control bits
* @is_msix: [PCI MSI/X] True if MSI-X
* @multiple: [PCI MSI/X] log2 num of messages allocated
* @multi_cap: [PCI MSI/X] log2 num of messages supported
@@ -139,7 +140,10 @@ struct msi_desc {
union {
/* PCI MSI/X specific data */
struct {
- u32 masked;
+ union {
+ u32 msi_mask;
+ u32 msix_ctrl;
+ };
struct {
u8 is_msix : 1;
u8 multiple : 3;