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include: Add a header to define host PCI MMIO functions

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Add a generic API for host PCI MMIO reads/writes
(e.g. Linux VFIO BAR accesses). The functions access
little endian memory and returns the result in
host cpu endianness.

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Farhan Ali <alifm@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 20250430185012.2303-3-alifm@linux.ibm.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Farhan Ali 2025-04-30 11:50:11 -07:00 • committed by Stefan Hajnoczi
parent b17d69a1da
commit 40f940923f
1 changed files with 136 additions and 0 deletions
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136
include/qemu/host-pci-mmio.h Normal file
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/*
* API for host PCI MMIO accesses (e.g. Linux VFIO BARs)
*
* Copyright 2025 IBM Corp.
* Author(s): Farhan Ali <alifm@linux.ibm.com>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef HOST_PCI_MMIO_H
#define HOST_PCI_MMIO_H
#include "qemu/bswap.h"
#include "qemu/s390x_pci_mmio.h"
static inline uint8_t host_pci_ldub_p(const void *ioaddr)
{
uint8_t ret = 0;
#ifdef __s390x__
ret = s390x_pci_mmio_read_8(ioaddr);
#else
ret = ldub_p(ioaddr);
#endif
return ret;
}
static inline uint16_t host_pci_lduw_le_p(const void *ioaddr)
{
uint16_t ret = 0;
#ifdef __s390x__
ret = le16_to_cpu(s390x_pci_mmio_read_16(ioaddr));
#else
ret = lduw_le_p(ioaddr);
#endif
return ret;
}
static inline uint32_t host_pci_ldl_le_p(const void *ioaddr)
{
uint32_t ret = 0;
#ifdef __s390x__
ret = le32_to_cpu(s390x_pci_mmio_read_32(ioaddr));
#else
ret = ldl_le_p(ioaddr);
#endif
return ret;
}
static inline uint64_t host_pci_ldq_le_p(const void *ioaddr)
{
uint64_t ret = 0;
#ifdef __s390x__
ret = le64_to_cpu(s390x_pci_mmio_read_64(ioaddr));
#else
ret = ldq_le_p(ioaddr);
#endif
return ret;
}
static inline void host_pci_stb_p(void *ioaddr, uint8_t val)
{
#ifdef __s390x__
s390x_pci_mmio_write_8(ioaddr, val);
#else
stb_p(ioaddr, val);
#endif
}
static inline void host_pci_stw_le_p(void *ioaddr, uint16_t val)
{
#ifdef __s390x__
s390x_pci_mmio_write_16(ioaddr, cpu_to_le16(val));
#else
stw_le_p(ioaddr, val);
#endif
}
static inline void host_pci_stl_le_p(void *ioaddr, uint32_t val)
{
#ifdef __s390x__
s390x_pci_mmio_write_32(ioaddr, cpu_to_le32(val));
#else
stl_le_p(ioaddr, val);
#endif
}
static inline void host_pci_stq_le_p(void *ioaddr, uint64_t val)
{
#ifdef __s390x__
s390x_pci_mmio_write_64(ioaddr, cpu_to_le64(val));
#else
stq_le_p(ioaddr, val);
#endif
}
static inline uint64_t host_pci_ldn_le_p(const void *ioaddr, int sz)
{
switch (sz) {
case 1:
return host_pci_ldub_p(ioaddr);
case 2:
return host_pci_lduw_le_p(ioaddr);
case 4:
return host_pci_ldl_le_p(ioaddr);
case 8:
return host_pci_ldq_le_p(ioaddr);
default:
g_assert_not_reached();
}
}
static inline void host_pci_stn_le_p(void *ioaddr, int sz, uint64_t v)
{
switch (sz) {
case 1:
host_pci_stb_p(ioaddr, v);
break;
case 2:
host_pci_stw_le_p(ioaddr, v);
break;
case 4:
host_pci_stl_le_p(ioaddr, v);
break;
case 8:
host_pci_stq_le_p(ioaddr, v);
break;
default:
g_assert_not_reached();
}
}
#endif