[PATCH v4 6/7] pseries/pci: Associate PEs to VFs in configure SR-IOV

[Bryant G. Ly]

After initial validation of SR-IOV resources, firmware will
associate PEs to the dynamic VFs created within this call. This
patch adds the association of PEs to the PF array of PE numbers
indexed by VF.

Signed-off-by: Bryant G. Ly <bryantly at linux.vnet.ibm.com>
Signed-off-by: Juan J. Alvarez <jjalvare at linux.vnet.ibm.com>
---
 arch/powerpc/platforms/pseries/pci.c | 150 ++++++++++++++++++++++++++++++++++-
 1 file changed, 148 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
index 48d3af026f90..eab96637d6cf 100644
--- a/arch/powerpc/platforms/pseries/pci.c
+++ b/arch/powerpc/platforms/pseries/pci.c
@@ -59,16 +59,162 @@ DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pcibios_name_device);
 #endif
 
 #ifdef CONFIG_PCI_IOV
+#define MAX_VFS_FOR_MAP_PE 256
+struct pe_map_bar_entry {
+	__be64     bar;       /* Input:  Virtual Function BAR */
+	__be16     rid;       /* Input:  Virtual Function Router ID */
+	__be16     pe_num;    /* Output: Virtual Function PE Number */
+	__be32     reserved;  /* Reserved Space */
+};
+
+int pseries_send_map_pe(struct pci_dev *pdev,
+			u16 num_vfs,
+			struct pe_map_bar_entry *vf_pe_array)
+{
+	struct pci_dn *pdn;
+	int rc;
+	unsigned long buid, addr;
+	int ibm_map_pes = rtas_token("ibm,open-sriov-map-pe-number");
+
+	if (ibm_map_pes == RTAS_UNKNOWN_SERVICE)
+		return -EINVAL;
+
+	pdn = pci_get_pdn(pdev);
+	addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
+	buid = pdn->phb->buid;
+	spin_lock(&rtas_data_buf_lock);
+	memcpy(rtas_data_buf, vf_pe_array,
+	       RTAS_DATA_BUF_SIZE);
+	rc = rtas_call(ibm_map_pes, 5, 1, NULL, addr,
+		       BUID_HI(buid), BUID_LO(buid),
+		       rtas_data_buf,
+		       num_vfs * sizeof(struct pe_map_bar_entry));
+	memcpy(vf_pe_array, rtas_data_buf, RTAS_DATA_BUF_SIZE);
+	spin_unlock(&rtas_data_buf_lock);
+
+	if (rc)
+		dev_err(&pdev->dev,
+			"%s: Failed to associate pes PE#%lx, rc=%x\n",
+			__func__,  addr, rc);
+
+	return rc;
+}
+
+void pseries_set_pe_num(struct pci_dev *pdev, u16 vf_index, __be16 pe_num)
+{
+	struct pci_dn *pdn;
+
+	pdn = pci_get_pdn(pdev);
+	pdn->pe_num_map[vf_index] = be16_to_cpu(pe_num);
+	dev_dbg(&pdev->dev, "VF %04x:%02x:%02x.%x associated with PE#%x\n",
+		pci_domain_nr(pdev->bus),
+		pdev->bus->number,
+		PCI_SLOT(pci_iov_virtfn_devfn(pdev, vf_index)),
+		PCI_FUNC(pci_iov_virtfn_devfn(pdev, vf_index)),
+		pdn->pe_num_map[vf_index]);
+}
+
+int pseries_associate_pes(struct pci_dev *pdev, u16 num_vfs)
+{
+	struct pci_dn *pdn;
+	int i, rc, vf_index;
+	struct pe_map_bar_entry *vf_pe_array;
+	struct resource *res;
+	u64 size;
+
+	vf_pe_array = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
+	if (!vf_pe_array)
+		return -ENOMEM;
+
+	pdn = pci_get_pdn(pdev);
+	/* create firmware structure to associate pes */
+	for (vf_index = 0; vf_index < num_vfs; vf_index++) {
+		pdn->pe_num_map[vf_index] = IODA_INVALID_PE;
+		for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
+			res = &pdev->resource[i + PCI_IOV_RESOURCES];
+			if (!res->parent)
+				continue;
+			size = pcibios_iov_resource_alignment(pdev, i +
+					PCI_IOV_RESOURCES);
+			vf_pe_array[vf_index].bar =
+				cpu_to_be64(res->start + size * vf_index);
+			vf_pe_array[vf_index].rid =
+				cpu_to_be16((pci_iov_virtfn_bus(pdev, vf_index)
+					    << 8) | pci_iov_virtfn_devfn(pdev,
+					    vf_index));
+			vf_pe_array[vf_index].pe_num =
+				cpu_to_be16(IODA_INVALID_PE);
+		}
+	}
+
+	rc = pseries_send_map_pe(pdev, num_vfs, vf_pe_array);
+	/* Only zero is success */
+	if (!rc)
+		for (vf_index = 0; vf_index < num_vfs; vf_index++)
+			pseries_set_pe_num(pdev, vf_index,
+					   vf_pe_array[vf_index].pe_num);
+
+	kfree(vf_pe_array);
+	return rc;
+}
+
+int pseries_pci_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
+{
+	struct pci_dn         *pdn;
+	int                    rc;
+	const int *max_vfs;
+	int max_config_vfs;
+	struct device_node *dn = pci_device_to_OF_node(pdev);
+
+	max_vfs = of_get_property(dn, "ibm,number-of-configurable-vfs", NULL);
+
+	if (!max_vfs)
+		return -EINVAL;
+
+	/* First integer stores max config */
+	max_config_vfs = of_read_number(&max_vfs[0], 1);
+	if (max_config_vfs < num_vfs && num_vfs > MAX_VFS_FOR_MAP_PE) {
+		dev_err(&pdev->dev,
+			"Num VFs %x > %x Configurable VFs\n",
+			num_vfs, (num_vfs > MAX_VFS_FOR_MAP_PE) ?
+			MAX_VFS_FOR_MAP_PE : max_config_vfs);
+		return -EINVAL;
+	}
+
+	pdn = pci_get_pdn(pdev);
+	pdn->pe_num_map = kmalloc_array(num_vfs,
+					sizeof(*pdn->pe_num_map),
+					GFP_KERNEL);
+	if (!pdn->pe_num_map)
+		return -ENOMEM;
+
+	rc = pseries_associate_pes(pdev, num_vfs);
+
+	/* Anything other than zero is failure */
+	if (rc) {
+		dev_err(&pdev->dev, "Failure to enable sriov: %x\n", rc);
+		kfree(pdn->pe_num_map);
+	} else {
+		pci_vf_drivers_autoprobe(pdev, false);
+	}
+
+	return rc;
+}
+
 int pseries_pcibios_sriov_enable(struct pci_dev *pdev, u16 num_vfs)
 {
 	/* Allocate PCI data */
 	add_dev_pci_data(pdev);
-	pci_vf_drivers_autoprobe(pdev, false);
-	return 0;
+	return pseries_pci_sriov_enable(pdev, num_vfs);
 }
 
 int pseries_pcibios_sriov_disable(struct pci_dev *pdev)
 {
+	struct pci_dn         *pdn;
+
+	pdn = pci_get_pdn(pdev);
+	/* Releasing pe_num_map */
+	kfree(pdn->pe_num_map);
 	/* Release PCI data */
 	remove_dev_pci_data(pdev);
 	pci_vf_drivers_autoprobe(pdev, true);
-- 
2.14.3 (Apple Git-98)