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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/s390/pci/pci_iov.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/s390/pci/pci_iov.c')
-rw-r--r--arch/s390/pci/pci_iov.c99
1 files changed, 99 insertions, 0 deletions
diff --git a/arch/s390/pci/pci_iov.c b/arch/s390/pci/pci_iov.c
new file mode 100644
index 0000000000..ead062bf2b
--- /dev/null
+++ b/arch/s390/pci/pci_iov.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright IBM Corp. 2020
+ *
+ * Author(s):
+ * Niklas Schnelle <schnelle@linux.ibm.com>
+ *
+ */
+
+#define KMSG_COMPONENT "zpci"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/pci.h>
+
+#include "pci_iov.h"
+
+static struct resource iov_res = {
+ .name = "PCI IOV res",
+ .start = 0,
+ .end = -1,
+ .flags = IORESOURCE_MEM,
+};
+
+void zpci_iov_map_resources(struct pci_dev *pdev)
+{
+ resource_size_t len;
+ int i;
+
+ for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
+ int bar = i + PCI_IOV_RESOURCES;
+
+ len = pci_resource_len(pdev, bar);
+ if (!len)
+ continue;
+ pdev->resource[bar].parent = &iov_res;
+ }
+}
+
+void zpci_iov_remove_virtfn(struct pci_dev *pdev, int vfn)
+{
+ pci_lock_rescan_remove();
+ /* Linux' vfid's start at 0 vfn at 1 */
+ pci_iov_remove_virtfn(pdev->physfn, vfn - 1);
+ pci_unlock_rescan_remove();
+}
+
+static int zpci_iov_link_virtfn(struct pci_dev *pdev, struct pci_dev *virtfn, int vfid)
+{
+ int rc;
+
+ rc = pci_iov_sysfs_link(pdev, virtfn, vfid);
+ if (rc)
+ return rc;
+
+ virtfn->is_virtfn = 1;
+ virtfn->multifunction = 0;
+ virtfn->physfn = pci_dev_get(pdev);
+
+ return 0;
+}
+
+int zpci_iov_setup_virtfn(struct zpci_bus *zbus, struct pci_dev *virtfn, int vfn)
+{
+ int i, cand_devfn;
+ struct zpci_dev *zdev;
+ struct pci_dev *pdev;
+ int vfid = vfn - 1; /* Linux' vfid's start at 0 vfn at 1*/
+ int rc = 0;
+
+ if (!zbus->multifunction)
+ return 0;
+
+ /* If the parent PF for the given VF is also configured in the
+ * instance, it must be on the same zbus.
+ * We can then identify the parent PF by checking what
+ * devfn the VF would have if it belonged to that PF using the PF's
+ * stride and offset. Only if this candidate devfn matches the
+ * actual devfn will we link both functions.
+ */
+ for (i = 0; i < ZPCI_FUNCTIONS_PER_BUS; i++) {
+ zdev = zbus->function[i];
+ if (zdev && zdev->is_physfn) {
+ pdev = pci_get_slot(zbus->bus, zdev->devfn);
+ if (!pdev)
+ continue;
+ cand_devfn = pci_iov_virtfn_devfn(pdev, vfid);
+ if (cand_devfn == virtfn->devfn) {
+ rc = zpci_iov_link_virtfn(pdev, virtfn, vfid);
+ /* balance pci_get_slot() */
+ pci_dev_put(pdev);
+ break;
+ }
+ /* balance pci_get_slot() */
+ pci_dev_put(pdev);
+ }
+ }
+ return rc;
+}