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bus/pci: support IOVA as VA in PowerVM LPARs

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Add IOMMU detection logic for PowerVM LPARs.

PowerNV $ cat /proc/cpuinfo
...
timebase     : 512000000
platform     : PowerNV
model        : 8335-GTW

PowerVM LPAR $ cat /proc/cpuinfo
...
timebase     : 512000000
platform     : pSeries
model        : IBM,9009-22A
machine      : CHRP IBM,9009-22A
MMU          : Hash

PowerNV KVM Guest $ cat /proc/cpuinfo
...
timebase     : 512000000
platform     : pSeries
model        : IBM pSeries (emulated by qemu)
machine      : CHRP IBM pSeries (emulated by qemu)
MMU          : Radix

Signed-off-by: David Christensen <drc@linux.vnet.ibm.com>
Reviewed-by: Thinh Tran <thinhtr@linux.vnet.ibm.com>
This commit is contained in:
David Christensen 2021-06-23 13:43:55 -07:00 committed by David Marchand
parent cc4219d1f0
commit fc5bffb8b5
1 changed files with 27 additions and 12 deletions
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39
drivers/bus/pci/linux/pci.c
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@ -549,16 +549,22 @@ bool
pci_device_iommu_support_va(__rte_unused const struct rte_pci_device *dev)
{
/*
* IOMMU is always present on a PowerNV host (IOMMUv2).
* IOMMU is also present in a KVM/QEMU VM (IOMMUv1) but is not
* currently supported by DPDK. Test for our current environment
* and report VA support as appropriate.
* All POWER systems support an IOMMU, but only IOMMUv2 supports
* IOVA = VA in DPDK. Check contents of /proc/cpuinfo to find the
* system.
*
* Platform | Model | IOMMU | VA? | Comment
* ---------+-------+---------+-----+---------------------------------
* PowerNV | N/A | IOMMUv2 | Yes | OpenPOWER (Bare Metal)
* pSeries | ~qemu | IOMMUv2 | Yes | PowerVM Logical Partition (LPAR)
* pSeries | qemu | IOMMUv1 | No | QEMU Virtual Machine
*/
char *line = NULL;
size_t len = 0;
char filename[PATH_MAX] = "/proc/cpuinfo";
FILE *fp = fopen(filename, "r");
bool pseries = false, powernv = false, qemu = false;
bool ret = false;
if (fp == NULL) {
@ -567,20 +573,29 @@ pci_device_iommu_support_va(__rte_unused const struct rte_pci_device *dev)
return ret;
}
/* Check for a PowerNV platform */
/* Check the "platform" and "model" fields */
while (getline(&line, &len, fp) != -1) {
if (strstr(line, "platform") == NULL)
continue;
if (strstr(line, "PowerNV") != NULL) {
RTE_LOG(DEBUG, EAL, "Running on a PowerNV system\n");
ret = true;
break;
if (strstr(line, "platform") != NULL) {
if (strstr(line, "PowerNV") != NULL) {
RTE_LOG(DEBUG, EAL, "Running on a PowerNV platform\n");
powernv = true;
} else if (strstr(line, "pSeries") != NULL) {
RTE_LOG(DEBUG, EAL, "Running on a pSeries platform\n");
pseries = true;
}
} else if (strstr(line, "model") != NULL) {
if (strstr(line, "qemu") != NULL) {
RTE_LOG(DEBUG, EAL, "Found qemu emulation\n");
qemu = true;
}
}
}
free(line);
fclose(fp);
if (powernv || (pseries && !qemu))
ret = true;
return ret;
}
#else