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 --- tools/perf/bench/futex.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 tools/perf/bench/futex.c (limited to 'tools/perf/bench/futex.c') diff --git a/tools/perf/bench/futex.c b/tools/perf/bench/futex.c new file mode 100644 index 000000000..1968c9d00 --- /dev/null +++ b/tools/perf/bench/futex.c @@ -0,0 +1,64 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include +#include +#include + +#include "futex.h" + +#ifndef PR_FUTEX_HASH +#define PR_FUTEX_HASH 78 +# define PR_FUTEX_HASH_SET_SLOTS 1 +# define PR_FUTEX_HASH_GET_SLOTS 2 +#endif // PR_FUTEX_HASH + +void futex_set_nbuckets_param(struct bench_futex_parameters *params) +{ + int ret; + + if (params->nbuckets < 0) + return; + + ret = prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS, params->nbuckets, 0); + if (ret) { + printf("Requesting %d hash buckets failed: %d/%m\n", + params->nbuckets, ret); + err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)"); + } +} + +void futex_print_nbuckets(struct bench_futex_parameters *params) +{ + char *futex_hash_mode; + int ret; + + ret = prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_GET_SLOTS); + if (params->nbuckets >= 0) { + if (ret != params->nbuckets) { + if (ret < 0) { + printf("Can't query number of buckets: %m\n"); + err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)"); + } + printf("Requested number of hash buckets does not currently used.\n"); + printf("Requested: %d in usage: %d\n", params->nbuckets, ret); + err(EXIT_FAILURE, "prctl(PR_FUTEX_HASH)"); + } + if (params->nbuckets == 0) + ret = asprintf(&futex_hash_mode, "Futex hashing: global hash"); + else + ret = asprintf(&futex_hash_mode, "Futex hashing: %d hash buckets", + params->nbuckets); + } else { + if (ret <= 0) { + ret = asprintf(&futex_hash_mode, "Futex hashing: global hash"); + } else { + ret = asprintf(&futex_hash_mode, "Futex hashing: auto resized to %d buckets", + ret); + } + } + if (ret < 0) + err(EXIT_FAILURE, "ENOMEM, futex_hash_mode"); + printf("%s\n", futex_hash_mode); + free(futex_hash_mode); +} -- cgit v1.3.1