From f146c7bc85a51f95c05e0f8173d484eb301ece78 Mon Sep 17 00:00:00 2001 From: Danilo Krummrich Date: Thu, 13 Aug 2026 18:52:04 +0200 Subject: PCI: Add pci_irq_type() to query the allocated interrupt type Add a helper that returns PCI_IRQ_MSIX, PCI_IRQ_MSI, or PCI_IRQ_INTX based on the interrupt type the PCI core selected after pci_alloc_irq_vectors(). Several drivers already open-code this check against pdev->msix_enabled and pdev->msi_enabled, or even open code this helper [1]. A common helper avoids the duplication and keeps drivers from accessing the bitfield directly (see also [2]). Acked-by: Bjorn Helgaas Tested-by: John Hubbard Link: https://elixir.bootlin.com/linux/v7.1/source/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c#L196 [1] Inspired-by: John Hubbard Link: https://lore.kernel.org/all/DKKG2QM3YJYB.Z2H2B2UXJ75N@kernel.org/ [2] Reviewed-by: Gary Guo Link: https://patch.msgid.link/20260813165234.620555-5-dakr@kernel.org [ Add missing pci_irq_type() stub for CONFIG_PCI=n. ] Signed-off-by: Danilo Krummrich --- arch/powerpc/lib/locks.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 arch/powerpc/lib/locks.c (limited to 'arch/powerpc/lib/locks.c') diff --git a/arch/powerpc/lib/locks.c b/arch/powerpc/lib/locks.c new file mode 100644 index 000000000..04165b7a1 --- /dev/null +++ b/arch/powerpc/lib/locks.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Spin and read/write lock operations. + * + * Copyright (C) 2001-2004 Paul Mackerras , IBM + * Copyright (C) 2001 Anton Blanchard , IBM + * Copyright (C) 2002 Dave Engebretsen , IBM + * Rework to support virtual processors + */ + +#include +#include +#include +#include + +/* waiting for a spinlock... */ +#if defined(CONFIG_PPC_SPLPAR) +#include +#include + +void splpar_spin_yield(arch_spinlock_t *lock) +{ + unsigned int lock_value, holder_cpu, yield_count; + + lock_value = lock->slock; + if (lock_value == 0) + return; + holder_cpu = lock_value & 0xffff; + BUG_ON(holder_cpu >= NR_CPUS); + + yield_count = yield_count_of(holder_cpu); + if ((yield_count & 1) == 0) + return; /* virtual cpu is currently running */ + rmb(); + if (lock->slock != lock_value) + return; /* something has changed */ + yield_to_preempted(holder_cpu, yield_count); +} +EXPORT_SYMBOL_GPL(splpar_spin_yield); + +/* + * Waiting for a read lock or a write lock on a rwlock... + * This turns out to be the same for read and write locks, since + * we only know the holder if it is write-locked. + */ +void splpar_rw_yield(arch_rwlock_t *rw) +{ + int lock_value; + unsigned int holder_cpu, yield_count; + + lock_value = rw->lock; + if (lock_value >= 0) + return; /* no write lock at present */ + holder_cpu = lock_value & 0xffff; + BUG_ON(holder_cpu >= NR_CPUS); + + yield_count = yield_count_of(holder_cpu); + if ((yield_count & 1) == 0) + return; /* virtual cpu is currently running */ + rmb(); + if (rw->lock != lock_value) + return; /* something has changed */ + yield_to_preempted(holder_cpu, yield_count); +} +#endif -- cgit v1.3.1