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vfio/pci: Support 8-byte PCI loads and stores

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Many PCI adapters can benefit or even require full 64bit read
and write access to their registers. In order to enable work on
user-space drivers for these devices add two new variations
vfio_pci_core_io{read|write}64 of the existing access methods
when the architecture supports 64-bit ioreads and iowrites.

Signed-off-by: Ben Segal <bpsegal@us.ibm.com>
Co-developed-by: Gerd Bayer <gbayer@linux.ibm.com>
Signed-off-by: Gerd Bayer <gbayer@linux.ibm.com>
Link: https://lore.kernel.org/r/20240619115847.1344875-3-gbayer@linux.ibm.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Ben Segal 2024-06-19 13:58:46 +02:00 committed by Alex Williamson
parent 186bfe44ea
commit 4df13a6871
2 changed files with 19 additions and 0 deletions
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16
drivers/vfio/pci/vfio_pci_rdwr.c
View File

@ -89,6 +89,9 @@ EXPORT_SYMBOL_GPL(vfio_pci_core_ioread##size);
VFIO_IOREAD(8)
VFIO_IOREAD(16)
VFIO_IOREAD(32)
#ifdef ioread64
VFIO_IOREAD(64)
#endif
#define VFIO_IORDWR(size) \
static int vfio_pci_iordwr##size(struct vfio_pci_core_device *vdev,\
@ -124,6 +127,10 @@ static int vfio_pci_iordwr##size(struct vfio_pci_core_device *vdev,\
VFIO_IORDWR(8)
VFIO_IORDWR(16)
VFIO_IORDWR(32)
#if defined(ioread64) && defined(iowrite64)
VFIO_IORDWR(64)
#endif
/*
* Read or write from an __iomem region (MMIO or I/O port) with an excluded
* range which is inaccessible. The excluded range drops writes and fills
@ -148,6 +155,15 @@ ssize_t vfio_pci_core_do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
else
fillable = 0;
#if defined(ioread64) && defined(iowrite64)
if (fillable >= 8 && !(off % 8)) {
ret = vfio_pci_iordwr64(vdev, iswrite, test_mem,
io, buf, off, &filled);
if (ret)
return ret;
} else
#endif
if (fillable >= 4 && !(off % 4)) {
ret = vfio_pci_iordwr32(vdev, iswrite, test_mem,
io, buf, off, &filled);

3
include/linux/vfio_pci_core.h
View File

@ -155,5 +155,8 @@ int vfio_pci_core_ioread##size(struct vfio_pci_core_device *vdev, \
VFIO_IOREAD_DECLATION(8)
VFIO_IOREAD_DECLATION(16)
VFIO_IOREAD_DECLATION(32)
#ifdef ioread64
VFIO_IOREAD_DECLATION(64)
#endif
#endif /* VFIO_PCI_CORE_H */