TWxSoftware/twx-linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

vfio/pci: Expose vfio_pci_core_iowrite/read##size()

Browse Source 
Expose vfio_pci_core_iowrite/read##size() to let it be used by drivers.

This functionality is needed to enable direct access to some physical
BAR of the device with the proper locks/checks in place.

The next patches from this series will use this functionality on a data
path flow when a direct access to the BAR is needed.

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/r/20231219093247.170936-9-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yishai Hadas
2023-12-19 11:32:46 +02:00
committed by Alex Williamson
parent 8bccc5b806
commit 8486ae162b
2 changed files with 45 additions and 24 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/vfio/pci/vfio_pci_rdwr.c
+26 -24
View File
@@ -38,7 +38,7 @@
#define vfio_iowrite8 iowrite8
#define VFIO_IOWRITE(size) \
static int vfio_pci_iowrite##size(struct vfio_pci_core_device *vdev, \
int vfio_pci_core_iowrite##size(struct vfio_pci_core_device *vdev, \
bool test_mem, u##size val, void __iomem *io) \
{ \
if (test_mem) { \
@@ -55,7 +55,8 @@ static int vfio_pci_iowrite##size(struct vfio_pci_core_device *vdev, \
up_read(&vdev->memory_lock); \
\
return 0; \
}
} \
EXPORT_SYMBOL_GPL(vfio_pci_core_iowrite##size);
VFIO_IOWRITE(8)
VFIO_IOWRITE(16)
@@ -65,7 +66,7 @@ VFIO_IOWRITE(64)
#endif
#define VFIO_IOREAD(size) \
static int vfio_pci_ioread##size(struct vfio_pci_core_device *vdev, \
int vfio_pci_core_ioread##size(struct vfio_pci_core_device *vdev, \
bool test_mem, u##size *val, void __iomem *io) \
{ \
if (test_mem) { \
@@ -82,7 +83,8 @@ static int vfio_pci_ioread##size(struct vfio_pci_core_device *vdev, \
up_read(&vdev->memory_lock); \
\
return 0; \
}
} \
EXPORT_SYMBOL_GPL(vfio_pci_core_ioread##size);
VFIO_IOREAD(8)
VFIO_IOREAD(16)
@@ -119,13 +121,13 @@ static ssize_t do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
if (copy_from_user(&val, buf, 4))
return -EFAULT;
ret = vfio_pci_iowrite32(vdev, test_mem,
val, io + off);
ret = vfio_pci_core_iowrite32(vdev, test_mem,
val, io + off);
if (ret)
return ret;
} else {
ret = vfio_pci_ioread32(vdev, test_mem,
&val, io + off);
ret = vfio_pci_core_ioread32(vdev, test_mem,
&val, io + off);
if (ret)
return ret;
@@ -141,13 +143,13 @@ static ssize_t do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
if (copy_from_user(&val, buf, 2))
return -EFAULT;
ret = vfio_pci_iowrite16(vdev, test_mem,
val, io + off);
ret = vfio_pci_core_iowrite16(vdev, test_mem,
val, io + off);
if (ret)
return ret;
} else {
ret = vfio_pci_ioread16(vdev, test_mem,
&val, io + off);
ret = vfio_pci_core_ioread16(vdev, test_mem,
&val, io + off);
if (ret)
return ret;
@@ -163,13 +165,13 @@ static ssize_t do_io_rw(struct vfio_pci_core_device *vdev, bool test_mem,
if (copy_from_user(&val, buf, 1))
return -EFAULT;
ret = vfio_pci_iowrite8(vdev, test_mem,
val, io + off);
ret = vfio_pci_core_iowrite8(vdev, test_mem,
val, io + off);
if (ret)
return ret;
} else {
ret = vfio_pci_ioread8(vdev, test_mem,
&val, io + off);
ret = vfio_pci_core_ioread8(vdev, test_mem,
&val, io + off);
if (ret)
return ret;
@@ -364,21 +366,21 @@ static void vfio_pci_ioeventfd_do_write(struct vfio_pci_ioeventfd *ioeventfd,
{
switch (ioeventfd->count) {
case 1:
vfio_pci_iowrite8(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
vfio_pci_core_iowrite8(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
break;
case 2:
vfio_pci_iowrite16(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
vfio_pci_core_iowrite16(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
break;
case 4:
vfio_pci_iowrite32(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
vfio_pci_core_iowrite32(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
break;
#ifdef iowrite64
case 8:
vfio_pci_iowrite64(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
vfio_pci_core_iowrite64(ioeventfd->vdev, test_mem,
ioeventfd->data, ioeventfd->addr);
break;
#endif
}
include/linux/vfio_pci_core.h
+19
View File
@@ -131,4 +131,23 @@ int vfio_pci_core_setup_barmap(struct vfio_pci_core_device *vdev, int bar);
pci_ers_result_t vfio_pci_core_aer_err_detected(struct pci_dev *pdev,
pci_channel_state_t state);
#define VFIO_IOWRITE_DECLATION(size) \
int vfio_pci_core_iowrite##size(struct vfio_pci_core_device *vdev, \
bool test_mem, u##size val, void __iomem *io);
VFIO_IOWRITE_DECLATION(8)
VFIO_IOWRITE_DECLATION(16)
VFIO_IOWRITE_DECLATION(32)
#ifdef iowrite64
VFIO_IOWRITE_DECLATION(64)
#endif
#define VFIO_IOREAD_DECLATION(size) \
int vfio_pci_core_ioread##size(struct vfio_pci_core_device *vdev, \
bool test_mem, u##size *val, void __iomem *io);
VFIO_IOREAD_DECLATION(8)
VFIO_IOREAD_DECLATION(16)
VFIO_IOREAD_DECLATION(32)
#endif /* VFIO_PCI_CORE_H */