5.15-stable review patch. If anyone has any objections, please let me know.
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From: Gerd Bayer gbayer@linux.ibm.com
[ Upstream commit 5fd11b96b43708f2f6e3964412c301c1bd20ec0f ]
Factor out adapter interrupt allocation from arch_setup_msi_irqs() in preparation for enabling registration of multiple MSIs. Code movement only, no change of functionality intended.
Signed-off-by: Gerd Bayer gbayer@linux.ibm.com Reviewed-by: Niklas Schnelle schnelle@linux.ibm.com Signed-off-by: Vasily Gorbik gor@linux.ibm.com Stable-dep-of: ab42fcb511fd ("s390/pci: Allow allocation of more than 1 MSI interrupt") Signed-off-by: Sasha Levin sashal@kernel.org --- arch/s390/pci/pci_irq.c | 54 ++++++++++++++++++++++++----------------- 1 file changed, 32 insertions(+), 22 deletions(-)
diff --git a/arch/s390/pci/pci_irq.c b/arch/s390/pci/pci_irq.c index 49e404c3e987a..39c3c29f0d1d3 100644 --- a/arch/s390/pci/pci_irq.c +++ b/arch/s390/pci/pci_irq.c @@ -262,33 +262,20 @@ static void zpci_floating_irq_handler(struct airq_struct *airq, bool floating) } }
-int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) +static int __alloc_airq(struct zpci_dev *zdev, int msi_vecs, + unsigned long *bit) { - struct zpci_dev *zdev = to_zpci(pdev); - unsigned int hwirq, msi_vecs, cpu; - unsigned long bit; - struct msi_desc *msi; - struct msi_msg msg; - int cpu_addr; - int rc, irq; - - zdev->aisb = -1UL; - zdev->msi_first_bit = -1U; - if (type == PCI_CAP_ID_MSI && nvec > 1) - return 1; - msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); - if (irq_delivery == DIRECTED) { /* Allocate cpu vector bits */ - bit = airq_iv_alloc(zpci_ibv[0], msi_vecs); - if (bit == -1UL) + *bit = airq_iv_alloc(zpci_ibv[0], msi_vecs); + if (*bit == -1UL) return -EIO; } else { /* Allocate adapter summary indicator bit */ - bit = airq_iv_alloc_bit(zpci_sbv); - if (bit == -1UL) + *bit = airq_iv_alloc_bit(zpci_sbv); + if (*bit == -1UL) return -EIO; - zdev->aisb = bit; + zdev->aisb = *bit;
/* Create adapter interrupt vector */ zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); @@ -296,10 +283,33 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) return -ENOMEM;
/* Wire up shortcut pointer */ - zpci_ibv[bit] = zdev->aibv; + zpci_ibv[*bit] = zdev->aibv; /* Each function has its own interrupt vector */ - bit = 0; + *bit = 0; } + return 0; +} + +int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) +{ + struct zpci_dev *zdev = to_zpci(pdev); + unsigned int hwirq, msi_vecs, cpu; + struct msi_desc *msi; + struct msi_msg msg; + unsigned long bit; + int cpu_addr; + int rc, irq; + + zdev->aisb = -1UL; + zdev->msi_first_bit = -1U; + + if (type == PCI_CAP_ID_MSI && nvec > 1) + return 1; + msi_vecs = min_t(unsigned int, nvec, zdev->max_msi); + + rc = __alloc_airq(zdev, msi_vecs, &bit); + if (rc < 0) + return rc;
/* Request MSI interrupts */ hwirq = bit;