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s390x/pci: get zPCI function info from host

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We use the capability chains of the VFIO_DEVICE_GET_INFO ioctl to retrieve
the CLP information that the kernel exports.

To be compatible with previous kernel versions we fall back on previous
predefined values, same as the emulation values, when the ioctl is found
to not support capability chains. If individual CLP capabilities are not
found, we fall back on default values for only those capabilities missing
from the chain.

This patch is based on work previously done by Pierre Morel.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[aw: non-Linux build fixes]
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Matthew Rosato 2020-10-26 11:34:41 -04:00 • committed by Alex Williamson
parent 92fe289ace
commit 1e7552ff5c
6 changed files with 202 additions and 7 deletions
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12
include/hw/s390x/s390-pci-clp.h
View file

@ -79,6 +79,7 @@ typedef struct ClpFhListEntry {
#define CLP_SET_DISABLE_PCI_FN 1 /* Yes, 1 disables it */
#define CLP_UTIL_STR_LEN 64
#define CLP_PFIP_NR_SEGMENTS 4
#define CLP_MASK_FMT 0xf0000000
@ -120,14 +121,17 @@ typedef struct ClpRspQueryPci {
uint32_t fmt;
uint64_t reserved1;
uint16_t vfn; /* virtual fn number */
#define CLP_RSP_QPCI_MASK_UTIL 0x100
#define CLP_RSP_QPCI_MASK_PFGID 0xff
uint16_t ug;
#define CLP_RSP_QPCI_MASK_UTIL 0x01
uint8_t flags;
uint8_t pfgid;
uint32_t fid; /* pci function id */
uint8_t bar_size[PCI_BAR_COUNT];
uint16_t pchid;
uint32_t bar[PCI_BAR_COUNT];
uint64_t reserved2;
uint8_t pfip[CLP_PFIP_NR_SEGMENTS];
uint16_t reserved2;
uint8_t fmbl;
uint8_t pft;
uint64_t sdma; /* start dma as */
uint64_t edma; /* end dma as */
uint32_t reserved3[11];