/* $NetBSD: pci_msi_machdep.c,v 1.10 2024/06/30 09:38:07 jmcneill Exp $ */ /*- * Copyright (c) 2018 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jared McNeill . * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: pci_msi_machdep.c,v 1.10 2024/06/30 09:38:07 jmcneill Exp $"); #include #include #include #include #include #include static SIMPLEQ_HEAD(, arm_pci_msi) arm_pci_msi_list = SIMPLEQ_HEAD_INITIALIZER(arm_pci_msi_list); static struct arm_pci_msi * arm_pci_msi_find_frame(pci_intr_handle_t ih) { struct arm_pci_msi *msip; const int id = __SHIFTOUT(ih, ARM_PCI_INTR_FRAME); SIMPLEQ_FOREACH(msip, &arm_pci_msi_list, msi_link) if (id == msip->msi_id) return msip; return NULL; } static struct arm_pci_msi * arm_pci_msi_lookup(const struct pci_attach_args *pa) { struct arm_pci_msi *msip; uint32_t rid, frameid; int b, d, f; pci_decompose_tag(pa->pa_pc, pa->pa_tag, &b, &d, &f); rid = (b << 8) | (d << 3) | f; frameid = pci_get_frameid(pa->pa_pc, rid); SIMPLEQ_FOREACH(msip, &arm_pci_msi_list, msi_link) if (frameid == msip->msi_id) return msip; return NULL; } static int arm_pci_msi_alloc_common(pci_intr_handle_t **ihps, int *count, const struct pci_attach_args *pa, bool exact) { pci_intr_handle_t *vectors; struct arm_pci_msi *msi; if ((pa->pa_flags & PCI_FLAGS_MSI_OKAY) == 0) return ENODEV; msi = arm_pci_msi_lookup(pa); if (msi == NULL || msi->msi_alloc == NULL) return EINVAL; vectors = msi->msi_alloc(msi, count, pa, exact); if (vectors == NULL) return ENOMEM; *ihps = vectors; return 0; } static int arm_pci_msix_alloc_common(pci_intr_handle_t **ihps, u_int *table_indexes, int *count, const struct pci_attach_args *pa, bool exact) { pci_intr_handle_t *vectors; struct arm_pci_msi *msi; if ((pa->pa_flags & PCI_FLAGS_MSIX_OKAY) == 0) return ENODEV; msi = arm_pci_msi_lookup(pa); if (msi == NULL || msi->msix_alloc == NULL) return EINVAL; vectors = msi->msix_alloc(msi, table_indexes, count, pa, exact); if (vectors == NULL) return ENOMEM; *ihps = vectors; return 0; } /* * arm_pci_msi MD API */ int arm_pci_msi_add(struct arm_pci_msi *msi) { SIMPLEQ_INSERT_TAIL(&arm_pci_msi_list, msi, msi_link); return 0; } void * arm_pci_msi_intr_establish(pci_chipset_tag_t pc, pci_intr_handle_t pih, int ipl, int (*func)(void *), void *arg, const char *xname) { struct arm_pci_msi *msi; msi = arm_pci_msi_find_frame(pih); if (msi == NULL) return NULL; return msi->msi_intr_establish(msi, pih, ipl, func, arg, xname); } /* * pci_msi(9) implementation */ int pci_msi_alloc(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, int *count) { return arm_pci_msi_alloc_common(ihps, count, pa, false); } int pci_msi_alloc_exact(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, int count) { return arm_pci_msi_alloc_common(ihps, &count, pa, true); } int pci_msix_alloc(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, int *count) { return arm_pci_msix_alloc_common(ihps, NULL, count, pa, false); } int pci_msix_alloc_exact(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, int count) { return arm_pci_msix_alloc_common(ihps, NULL, &count, pa, true); } int pci_msix_alloc_map(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, u_int *table_indexes, int count) { return arm_pci_msix_alloc_common(ihps, table_indexes, &count, pa, true); } int pci_intx_alloc(const struct pci_attach_args *pa, pci_intr_handle_t **ihp) { pci_intr_handle_t *pih; if (ihp == NULL) return EINVAL; pih = kmem_alloc(sizeof(*pih), KM_SLEEP); if (pci_intr_map(pa, pih) != 0) { kmem_free(pih, sizeof(*pih)); return EINVAL; } *ihp = pih; return 0; } int pci_intr_alloc(const struct pci_attach_args *pa, pci_intr_handle_t **ihps, int *counts, pci_intr_type_t max_type) { int intx_count, msi_count, msix_count, error; error = EINVAL; if (counts != NULL) { intx_count = msi_count = msix_count = 0; switch (max_type) { case PCI_INTR_TYPE_MSIX: msix_count = counts[PCI_INTR_TYPE_MSIX]; /* FALLTHROUGH */ case PCI_INTR_TYPE_MSI: msi_count = counts[PCI_INTR_TYPE_MSI]; /* FALLTHROUGH */ case PCI_INTR_TYPE_INTX: intx_count = counts[PCI_INTR_TYPE_INTX]; if (intx_count > 1) return EINVAL; break; default: return EINVAL; } memset(counts, 0, sizeof(*counts) * PCI_INTR_TYPE_SIZE); } else { intx_count = msi_count = msix_count = 1; } if (msix_count == -1) msix_count = pci_msix_count(pa->pa_pc, pa->pa_tag); if (msix_count > 0 && (error = pci_msix_alloc_exact(pa, ihps, msix_count)) == 0) { if (counts != NULL) counts[PCI_INTR_TYPE_MSIX] = msix_count; return 0; } if (msi_count == -1) msi_count = pci_msi_count(pa->pa_pc, pa->pa_tag); if (msi_count > 0 && (error = pci_msi_alloc_exact(pa, ihps, msi_count)) == 0) { if (counts != NULL) counts[PCI_INTR_TYPE_MSI] = msi_count; return 0; } if (intx_count > 0 && (error = pci_intx_alloc(pa, ihps)) == 0) { if (counts != NULL) counts[PCI_INTR_TYPE_INTX] = intx_count; return 0; } return error; } void pci_intr_release(pci_chipset_tag_t pc, pci_intr_handle_t *pih, int count) { struct arm_pci_msi *msi = NULL; if (pih == NULL || count == 0) return; if ((pih[0] & (ARM_PCI_INTR_MSIX|ARM_PCI_INTR_MSI)) != 0) { msi = arm_pci_msi_find_frame(pih[0]); KASSERT(msi != NULL); msi->msi_intr_release(msi, pih, count); } kmem_free(pih, sizeof(*pih) * count); } pci_intr_type_t pci_intr_type(pci_chipset_tag_t pc, pci_intr_handle_t ih) { if (ih & ARM_PCI_INTR_MSIX) return PCI_INTR_TYPE_MSIX; if (ih & ARM_PCI_INTR_MSI) return PCI_INTR_TYPE_MSI; return PCI_INTR_TYPE_INTX; }