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s390/pci: provide support for MIO instructions

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Provide support for PCI I/O instructions that work on mapped IO addresses.

Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott
2019-04-14 15:38:01 +02:00
committed by Martin Schwidefsky
parent c475f1770a
commit 71ba41c9b1
7 changed files with 294 additions and 31 deletions
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25
arch/s390/pci/pci_clp.c
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@@ -163,7 +163,14 @@ static int clp_store_query_pci_fn(struct zpci_dev *zdev,
memcpy(zdev->util_str, response->util_str,
sizeof(zdev->util_str));
}
zdev->mio_capable = response->mio_addr_avail;
for (i = 0; i < PCI_BAR_COUNT; i++) {
if (!(response->mio_valid & (1 << (PCI_BAR_COUNT - i - 1))))
continue;
zdev->bars[i].mio_wb = (void __iomem *) response->addr[i].wb;
zdev->bars[i].mio_wt = (void __iomem *) response->addr[i].wt;
}
return 0;
}
@@ -279,11 +286,18 @@ int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
int rc;
rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
if (!rc)
/* Success -> store enabled handle in zdev */
zdev->fh = fh;
zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
if (rc)
goto out;
zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
zdev->fh = fh;
if (zdev->mio_capable) {
rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO);
zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
if (rc)
clp_disable_fh(zdev);
}
out:
return rc;
}
@@ -296,11 +310,10 @@ int clp_disable_fh(struct zpci_dev *zdev)
return 0;
rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
if (!rc)
/* Success -> store disabled handle in zdev */
zdev->fh = fh;
zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
return rc;
}