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charset="utf-8" From: Jared Rossi Call Logical Processor (CLP) Architecture is used for managing PCI function= s on s390x. Define and include the structures and routines needed to interact wi= th PCI devices during IPL. Signed-off-by: Jared Rossi Acked-by: Thomas Huth --- pc-bios/s390-ccw/Makefile | 2 +- pc-bios/s390-ccw/clp.c | 96 +++++++++++++++++++++++++++++++++++++++ pc-bios/s390-ccw/clp.h | 24 ++++++++++ 3 files changed, 121 insertions(+), 1 deletion(-) create mode 100644 pc-bios/s390-ccw/clp.c create mode 100644 pc-bios/s390-ccw/clp.h diff --git a/pc-bios/s390-ccw/Makefile b/pc-bios/s390-ccw/Makefile index 259cff09db..9c29548f84 100644 --- a/pc-bios/s390-ccw/Makefile +++ b/pc-bios/s390-ccw/Makefile @@ -35,7 +35,7 @@ QEMU_DGFLAGS =3D -MMD -MP -MT $@ -MF $(@D)/$(*F).d =20 OBJECTS =3D start.o main.o bootmap.o jump2ipl.o sclp.o menu.o netmain.o \ virtio.o virtio-net.o virtio-scsi.o virtio-blkdev.o cio.o dasd-ipl.o \ - virtio-ccw.o + virtio-ccw.o clp.o =20 SLOF_DIR :=3D $(SRC_PATH)/../../roms/SLOF =20 diff --git a/pc-bios/s390-ccw/clp.c b/pc-bios/s390-ccw/clp.c new file mode 100644 index 0000000000..2a14bb9b73 --- /dev/null +++ b/pc-bios/s390-ccw/clp.c @@ -0,0 +1,96 @@ +/* + * Call Logical Processor (CLP) architecture + * + * Copyright 2025 IBM Corp. + * Author(s): Jared Rossi + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#include "clp.h" +#include +#include + +int clp_pci(void *data) +{ + struct { uint8_t _[2048]; } *req =3D data; + int cc =3D 3; + + asm volatile ( + " .insn rrf,0xb9a00000,0,%[req],0,2\n" + " ipm %[cc]\n" + " srl %[cc],28\n" + : [cc] "+d" (cc), "+m" (*req) + : [req] "a" (req) + : "cc"); + return cc; +} + +/* + * Get the PCI function entry for a given function ID + * Return 0 on success, 1 if the FID is not found, or a negative RC on err= or + */ +int find_pci_function(uint32_t fid, ClpFhListEntry *entry) +{ + int count =3D 0; + int limit =3D PCI_MAX_FUNCTIONS; + ClpReqRspListPci rrb; + + rrb.request.hdr.len =3D 32; + rrb.request.hdr.cmd =3D 0x02; + rrb.request.resume_token =3D 0; + rrb.response.hdr.len =3D sizeof(ClpRspListPci); + + do { + if (clp_pci(&rrb) || rrb.response.hdr.rsp !=3D 0x0010) { + puts("Failed to list PCI functions"); + return -1; + } + + /* Resume token set when max enteries are returned */ + if (rrb.response.resume_token) { + count =3D CLP_FH_LIST_NR_ENTRIES; + rrb.request.resume_token =3D rrb.response.resume_token; + } else { + count =3D (rrb.response.hdr.len - 32) / sizeof(ClpFhListEntry); + } + + limit -=3D count; + + for (int i =3D 0; i < count; i++) { + if (rrb.response.fh_list[i].fid =3D=3D fid) { + memcpy(entry, &rrb.response.fh_list[i], sizeof(ClpFhListEn= try)); + return 0; + } + } + + } while (rrb.request.resume_token && limit > 0); + + puts("No function entry found for FID!"); + + return 1; +} + +/* + * Enable the PCI function associated with a given handle + * Return 0 on success or a negative RC on error + */ +int enable_pci_function(uint32_t *fhandle) +{ + ClpReqRspSetPci rrb; + + rrb.request.hdr.len =3D 32; + rrb.request.hdr.cmd =3D 0x05; + rrb.request.fh =3D *fhandle; + rrb.request.oc =3D 0; + rrb.request.ndas =3D 1; + rrb.response.hdr.len =3D 32; + + if (clp_pci(&rrb) || rrb.response.hdr.rsp !=3D 0x0010) { + puts("Failed to enable PCI function"); + return -1; + } + + *fhandle =3D rrb.response.fh; + return 0; +} diff --git a/pc-bios/s390-ccw/clp.h b/pc-bios/s390-ccw/clp.h new file mode 100644 index 0000000000..1ac2f8c177 --- /dev/null +++ b/pc-bios/s390-ccw/clp.h @@ -0,0 +1,24 @@ +/* + * Call Logical Processor (CLP) architecture definitions + * + * Copyright 2025 IBM Corp. + * Author(s): Jared Rossi + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#ifndef CLP_H +#define CLP_H + +#ifndef QEMU_PACKED +#define QEMU_PACKED __attribute__((packed)) +#endif + +#include +#include + +int clp_pci(void *data); +int find_pci_function(uint32_t fid, ClpFhListEntry *entry); +int enable_pci_function(uint32_t *fhandle); + +#endif --=20 2.52.0