linux-kernel - [tip: irq/core] PCI/MSI: Provide a new set of mask and unmask functions

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Date:   Tue, 10 Aug 2021 09:07:38 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: irq/core] PCI/MSI: Provide a new set of mask and unmask functions

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     fcacdfbef5a1633211ebfac1b669a7739f5b553e
Gitweb:        https://git.kernel.org/tip/fcacdfbef5a1633211ebfac1b669a7739f5b553e
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 09 Aug 2021 21:08:56 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 10 Aug 2021 11:03:30 +02:00

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

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@...utronix.de>
Tested-by: Marc Zyngier <maz@...nel.org>
Reviewed-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/875ywetozb.ffs@tglx
---
 drivers/pci/msi.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 2eab07b..26dd91f 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -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