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-----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJZYAFUAAoJEFmIoMA60/r8cFQP/A4fpdjhd42WRNQXGTpZieop i40lBQtGdBn/UY97U6BoutcS1ygDi9OiSzg+IR6I90iMgidqyUHFhe4hGWgVHD2g Tg0KLzd+lKKfQ6Gqt1P6t4dLGLvyEj5NUbCeFE4XYODAUkkiBaOndax6DK1GvU54 Vjuj63rHtMKFR/tG/4iFTigObqyI8QE6O9JVxwuvIyEX6RXKbJe+wkulv5taSnWt Ne94950i10MrELtNreVdi8UbCbXiqjg0r5sKI/WTJ7Bc7WsC7X5PhWlhcNrbHyBT Ivhoypkui3Ky8gvwWqL0KBG+cRp8prBXAdabrD9wRbz0TKnfGI6pQzseCGRnkE6T mhlSJpsSNIHaejoCjk93yPn5oRiTNtPMdVhMpEQL9V/crVRGRRmbd7v2TYvpMHVR JaPZ8bv+C2aBTY8uL3/v/rgrjsMKOYFeaxeNklpErxrknsbgb6BgubmeZXDvTBVv YUIbAkvveonUKisv+kbD8L7tp1+jdbRUT0AikS0NVgAJQhfArOmBcDpTL9YC51vE feFhkVx4A32vvOm7Zcg9A7IMXNjeSfccKGw3dJOAvzgDODuJiaCG6S0o7B5Yngze axMi87ixGT4QM98z/I4MC8E9rDrJdIitlpvb6ZBgiLzoO3kmvsIZZKt8UxWqf5r8 w3U2HoyKH13Qbkn1xkum =mkyb -----END PGP SIGNATURE----- Merge tag 'pci-v4.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci Pull PCI updates from Bjorn Helgaas: - add sysfs max_link_speed/width, current_link_speed/width (Wong Vee Khee) - make host bridge IRQ mapping much more generic (Matthew Minter, Lorenzo Pieralisi) - convert most drivers to pci_scan_root_bus_bridge() (Lorenzo Pieralisi) - mutex sriov_configure() (Jakub Kicinski) - mutex pci_error_handlers callbacks (Christoph Hellwig) - split ->reset_notify() into ->reset_prepare()/reset_done() (Christoph Hellwig) - support multiple PCIe portdrv interrupts for MSI as well as MSI-X (Gabriele Paoloni) - allocate MSI/MSI-X vector for Downstream Port Containment (Gabriele Paoloni) - fix MSI IRQ affinity pre/post/min_vecs issue (Michael Hernandez) - test INTx masking during enumeration, not at run-time (Piotr Gregor) - avoid using device_may_wakeup() for runtime PM (Rafael J. Wysocki) - restore the status of PCI devices across hibernation (Chen Yu) - keep parent resources that start at 0x0 (Ard Biesheuvel) - enable ECRC only if device supports it (Bjorn Helgaas) - restore PRI and PASID state after Function-Level Reset (CQ Tang) - skip DPC event if device is not present (Keith Busch) - check domain when matching SMBIOS info (Sujith Pandel) - mark Intel XXV710 NIC INTx masking as broken (Alex Williamson) - avoid AMD SB7xx EHCI USB wakeup defect (Kai-Heng Feng) - work around long-standing Macbook Pro poweroff issue (Bjorn Helgaas) - add Switchtec "running" status flag (Logan Gunthorpe) - fix dra7xx incorrect RW1C IRQ register usage (Arvind Yadav) - modify xilinx-nwl IRQ chip for legacy interrupts (Bharat Kumar Gogada) - move VMD SRCU cleanup after bus, child device removal (Jon Derrick) - add Faraday clock handling (Linus Walleij) - configure Rockchip MPS and reorganize (Shawn Lin) - limit Qualcomm TLP size to 2K (hardware issue) (Srinivas Kandagatla) - support Tegra MSI 64-bit addressing (Thierry Reding) - use Rockchip normal (not privileged) register bank (Shawn Lin) - add HiSilicon Kirin SoC PCIe controller driver (Xiaowei Song) - add Sigma Designs Tango SMP8759 PCIe controller driver (Marc Gonzalez) - add MediaTek PCIe host controller support (Ryder Lee) - add Qualcomm IPQ4019 support (John Crispin) - add HyperV vPCI protocol v1.2 support (Jork Loeser) - add i.MX6 regulator support (Quentin Schulz) * tag 'pci-v4.13-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (113 commits) PCI: tango: Add Sigma Designs Tango SMP8759 PCIe host bridge support PCI: Add DT binding for Sigma Designs Tango PCIe controller PCI: rockchip: Use normal register bank for config accessors dt-bindings: PCI: Add documentation for MediaTek PCIe PCI: Remove __pci_dev_reset() and pci_dev_reset() PCI: Split ->reset_notify() method into ->reset_prepare() and ->reset_done() PCI: xilinx: Make of_device_ids const PCI: xilinx-nwl: Modify IRQ chip for legacy interrupts PCI: vmd: Move SRCU cleanup after bus, child device removal PCI: vmd: Correct comment: VMD domains start at 0x10000, not 0x1000 PCI: versatile: Add local struct device pointers PCI: tegra: Do not allocate MSI target memory PCI: tegra: Support MSI 64-bit addressing PCI: rockchip: Use local struct device pointer consistently PCI: rockchip: Check for clk_prepare_enable() errors during resume MAINTAINERS: Remove Wenrui Li as Rockchip PCIe driver maintainer PCI: rockchip: Configure RC's MPS setting PCI: rockchip: Reconfigure configuration space header type PCI: rockchip: Split out rockchip_pcie_cfg_configuration_accesses() PCI: rockchip: Move configuration accesses into rockchip_pcie_cfg_atu() ...
220 lines
5.4 KiB
C
220 lines
5.4 KiB
C
/*
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* Copyright (C) 2016 Thomas Gleixner.
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* Copyright (C) 2016-2017 Christoph Hellwig.
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*/
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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static void irq_spread_init_one(struct cpumask *irqmsk, struct cpumask *nmsk,
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int cpus_per_vec)
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{
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const struct cpumask *siblmsk;
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int cpu, sibl;
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for ( ; cpus_per_vec > 0; ) {
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cpu = cpumask_first(nmsk);
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/* Should not happen, but I'm too lazy to think about it */
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if (cpu >= nr_cpu_ids)
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return;
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cpumask_clear_cpu(cpu, nmsk);
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cpumask_set_cpu(cpu, irqmsk);
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cpus_per_vec--;
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/* If the cpu has siblings, use them first */
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siblmsk = topology_sibling_cpumask(cpu);
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for (sibl = -1; cpus_per_vec > 0; ) {
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sibl = cpumask_next(sibl, siblmsk);
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if (sibl >= nr_cpu_ids)
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break;
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if (!cpumask_test_and_clear_cpu(sibl, nmsk))
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continue;
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cpumask_set_cpu(sibl, irqmsk);
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cpus_per_vec--;
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}
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}
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}
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static cpumask_var_t *alloc_node_to_present_cpumask(void)
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{
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cpumask_var_t *masks;
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int node;
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masks = kcalloc(nr_node_ids, sizeof(cpumask_var_t), GFP_KERNEL);
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if (!masks)
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return NULL;
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for (node = 0; node < nr_node_ids; node++) {
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if (!zalloc_cpumask_var(&masks[node], GFP_KERNEL))
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goto out_unwind;
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}
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return masks;
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out_unwind:
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while (--node >= 0)
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free_cpumask_var(masks[node]);
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kfree(masks);
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return NULL;
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}
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static void free_node_to_present_cpumask(cpumask_var_t *masks)
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{
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int node;
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for (node = 0; node < nr_node_ids; node++)
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free_cpumask_var(masks[node]);
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kfree(masks);
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}
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static void build_node_to_present_cpumask(cpumask_var_t *masks)
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{
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int cpu;
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for_each_present_cpu(cpu)
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cpumask_set_cpu(cpu, masks[cpu_to_node(cpu)]);
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}
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static int get_nodes_in_cpumask(cpumask_var_t *node_to_present_cpumask,
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const struct cpumask *mask, nodemask_t *nodemsk)
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{
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int n, nodes = 0;
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/* Calculate the number of nodes in the supplied affinity mask */
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for_each_node(n) {
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if (cpumask_intersects(mask, node_to_present_cpumask[n])) {
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node_set(n, *nodemsk);
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nodes++;
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}
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}
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return nodes;
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}
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/**
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* irq_create_affinity_masks - Create affinity masks for multiqueue spreading
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* @nvecs: The total number of vectors
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* @affd: Description of the affinity requirements
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*
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* Returns the masks pointer or NULL if allocation failed.
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*/
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struct cpumask *
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irq_create_affinity_masks(int nvecs, const struct irq_affinity *affd)
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{
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int n, nodes, cpus_per_vec, extra_vecs, curvec;
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int affv = nvecs - affd->pre_vectors - affd->post_vectors;
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int last_affv = affv + affd->pre_vectors;
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nodemask_t nodemsk = NODE_MASK_NONE;
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struct cpumask *masks;
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cpumask_var_t nmsk, *node_to_present_cpumask;
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/*
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* If there aren't any vectors left after applying the pre/post
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* vectors don't bother with assigning affinity.
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*/
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if (!affv)
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return NULL;
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if (!zalloc_cpumask_var(&nmsk, GFP_KERNEL))
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return NULL;
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masks = kcalloc(nvecs, sizeof(*masks), GFP_KERNEL);
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if (!masks)
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goto out;
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node_to_present_cpumask = alloc_node_to_present_cpumask();
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if (!node_to_present_cpumask)
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goto out;
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/* Fill out vectors at the beginning that don't need affinity */
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for (curvec = 0; curvec < affd->pre_vectors; curvec++)
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cpumask_copy(masks + curvec, irq_default_affinity);
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/* Stabilize the cpumasks */
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get_online_cpus();
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build_node_to_present_cpumask(node_to_present_cpumask);
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nodes = get_nodes_in_cpumask(node_to_present_cpumask, cpu_present_mask,
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&nodemsk);
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/*
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* If the number of nodes in the mask is greater than or equal the
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* number of vectors we just spread the vectors across the nodes.
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*/
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if (affv <= nodes) {
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for_each_node_mask(n, nodemsk) {
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cpumask_copy(masks + curvec,
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node_to_present_cpumask[n]);
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if (++curvec == last_affv)
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break;
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}
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goto done;
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}
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for_each_node_mask(n, nodemsk) {
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int ncpus, v, vecs_to_assign, vecs_per_node;
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/* Spread the vectors per node */
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vecs_per_node = (affv - (curvec - affd->pre_vectors)) / nodes;
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/* Get the cpus on this node which are in the mask */
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cpumask_and(nmsk, cpu_present_mask, node_to_present_cpumask[n]);
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/* Calculate the number of cpus per vector */
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ncpus = cpumask_weight(nmsk);
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vecs_to_assign = min(vecs_per_node, ncpus);
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/* Account for rounding errors */
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extra_vecs = ncpus - vecs_to_assign * (ncpus / vecs_to_assign);
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for (v = 0; curvec < last_affv && v < vecs_to_assign;
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curvec++, v++) {
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cpus_per_vec = ncpus / vecs_to_assign;
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/* Account for extra vectors to compensate rounding errors */
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if (extra_vecs) {
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cpus_per_vec++;
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--extra_vecs;
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}
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irq_spread_init_one(masks + curvec, nmsk, cpus_per_vec);
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}
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if (curvec >= last_affv)
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break;
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--nodes;
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}
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done:
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put_online_cpus();
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/* Fill out vectors at the end that don't need affinity */
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for (; curvec < nvecs; curvec++)
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cpumask_copy(masks + curvec, irq_default_affinity);
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free_node_to_present_cpumask(node_to_present_cpumask);
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out:
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free_cpumask_var(nmsk);
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return masks;
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}
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/**
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* irq_calc_affinity_vectors - Calculate the optimal number of vectors
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* @minvec: The minimum number of vectors available
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* @maxvec: The maximum number of vectors available
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* @affd: Description of the affinity requirements
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*/
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int irq_calc_affinity_vectors(int minvec, int maxvec, const struct irq_affinity *affd)
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{
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int resv = affd->pre_vectors + affd->post_vectors;
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int vecs = maxvec - resv;
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int ret;
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if (resv > minvec)
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return 0;
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get_online_cpus();
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ret = min_t(int, cpumask_weight(cpu_present_mask), vecs) + resv;
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put_online_cpus();
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return ret;
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}
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