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PCI/MSI: Provide a new set of mask and unmask functions

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The existing mask/unmask functions are convoluted and generate suboptimal
assembly code.

Provide a new set of functions which will be used in later patches to
replace the exisiting ones.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/875ywetozb.ffs@tglx
This commit is contained in:
Thomas Gleixner 2021-08-09 21:08:56 +02:00
parent 7327cefebb
commit fcacdfbef5
1 changed files with 72 additions and 0 deletions
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72
drivers/pci/msi.c
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@ -211,6 +211,78 @@ static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
return (1 << (1 << desc->msi_attrib.multi_cap)) - 1;
}
static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
{
raw_spinlock_t *lock = &desc->dev->msi_lock;
unsigned long flags;
raw_spin_lock_irqsave(lock, flags);
desc->msi_mask &= ~clear;
desc->msi_mask |= set;
pci_write_config_dword(msi_desc_to_pci_dev(desc), desc->mask_pos,
desc->msi_mask);
raw_spin_unlock_irqrestore(lock, flags);
}
static inline void pci_msi_mask(struct msi_desc *desc, u32 mask)
{
pci_msi_update_mask(desc, 0, mask);
}
static inline void pci_msi_unmask(struct msi_desc *desc, u32 mask)
{
pci_msi_update_mask(desc, mask, 0);
}
/*
* 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.
* It does not affect the msi_desc::msix_ctrl cache either. Use with care!
*/
static void pci_msix_write_vector_ctrl(struct msi_desc *desc, u32 ctrl)
{
void __iomem *desc_addr = pci_msix_desc_addr(desc);
writel(ctrl, desc_addr + PCI_MSIX_ENTRY_VECTOR_CTRL);
}
static inline void pci_msix_mask(struct msi_desc *desc)
{
desc->msix_ctrl |= PCI_MSIX_ENTRY_CTRL_MASKBIT;
pci_msix_write_vector_ctrl(desc, desc->msix_ctrl);
/* Flush write to device */
readl(desc->mask_base);
}
static inline void pci_msix_unmask(struct msi_desc *desc)
{
desc->msix_ctrl &= ~PCI_MSIX_ENTRY_CTRL_MASKBIT;
pci_msix_write_vector_ctrl(desc, desc->msix_ctrl);
}
static void __pci_msi_mask_desc(struct msi_desc *desc, u32 mask)
{
if (pci_msi_ignore_mask || desc->msi_attrib.is_virtual)
return;
if (desc->msi_attrib.is_msix)
pci_msix_mask(desc);
else if (desc->msi_attrib.maskbit)
pci_msi_mask(desc, mask);
}
static void __pci_msi_unmask_desc(struct msi_desc *desc, u32 mask)
{
if (pci_msi_ignore_mask || desc->msi_attrib.is_virtual)
return;
if (desc->msi_attrib.is_msix)
pci_msix_unmask(desc);
else if (desc->msi_attrib.maskbit)
pci_msi_unmask(desc, mask);
}
/**
* pci_msi_mask_irq - Generic IRQ chip callback to mask PCI/MSI interrupts
* @data: pointer to irqdata associated to that interrupt