dm: PTM: Add virtual root port to vm
If PTM can be enabled on passthru device, a virtual root port is added to vm to act as ptm root. And the passthru device is connected to the virtual root port instead of the virtual host bridge. Tracked-On: #5915 Signed-off-by: Rong Liu <rong.l.liu@intel.com> Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Rong Liu
wenlingz
parent
d5d792aa96
commit
7e93f31e2c
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@ -18,6 +18,10 @@
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#include "passthru.h"
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#include "pci_util.h"
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#include "vmmapi.h"
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#include "acrn_common.h"
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#define PTM_ROOT_PORT_VENDOR 0x8086U
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#define PTM_ROOT_PORT_DEVICE 0x9d14U
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/* PTM capability register ID*/
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#define PCIZ_PTM 0x1fU
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@ -33,6 +37,9 @@
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#define PCIM_PTM_CTRL_ENABLE 0x1U /* PTM enable */
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#define PCIM_PTM_CTRL_ROOT_SELECT 0x2U /* Root select */
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/* virtual root port secondary bus */
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static int ptm_root_port_secondary_bus;
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/* get ptm capability register value */
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static int
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get_ptm_cap(struct pci_device *pdev, int *offset)
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@ -56,13 +63,61 @@ get_ptm_cap(struct pci_device *pdev, int *offset)
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return cap;
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}
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/* Probe whether device and its root port support PTM */
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int ptm_probe(struct vmctx *ctx, struct passthru_dev *ptdev)
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/* add virtual root port to hv */
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static int
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add_vroot_port(struct vmctx *ctx, struct passthru_dev *ptdev, struct pci_device *root_port, int ptm_cap_offset)
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{
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int error = 0;
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struct acrn_emul_dev rp_vdev = {};
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struct vrp_config *rp_priv = (struct vrp_config *)&rp_vdev.args;
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rp_vdev.dev_id.fields.vendor_id = PTM_ROOT_PORT_VENDOR;
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rp_vdev.dev_id.fields.device_id = PTM_ROOT_PORT_DEVICE;
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// virtual root port takes bdf from its downstream device
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rp_vdev.slot = PCI_BDF(ptdev->dev->bus, ptdev->dev->slot, ptdev->dev->func);
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rp_priv->phy_bdf = PCI_BDF(root_port->bus, root_port->dev, root_port->func);
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rp_priv->primary_bus = ptdev->dev->bus;
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rp_priv->secondary_bus = ++ptm_root_port_secondary_bus;
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// only passthru device is connected to virtual root port
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rp_priv->subordinate_bus = rp_priv->secondary_bus;
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rp_priv->ptm_capable = 1;
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rp_priv->ptm_cap_offset = ptm_cap_offset;
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pr_info("%s: virtual root port info: vbdf=0x%x, phy_bdf=0x%x, prim_bus=%x, sec_bus=%x, sub_bus=%x, ptm_cpa_offset=0x%x.\n", __func__,
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rp_vdev.slot, rp_priv->phy_bdf, rp_priv->primary_bus, rp_priv->secondary_bus, rp_priv->subordinate_bus, rp_priv->ptm_cap_offset);
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error = vm_add_hv_vdev(ctx, &rp_vdev);
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if (error) {
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pr_err("failed to add virtual root.\n");
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return -1;
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} else
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return rp_priv->secondary_bus;
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}
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/* Probe whether device and its root port support PTM */
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int ptm_probe(struct vmctx *ctx, struct passthru_dev *ptdev, int *vrp_sec_bus)
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{
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int error = 0;
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int pos, pcie_type, cap, rootport_ptm_offset, device_ptm_offset;
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struct pci_device *phys_dev = ptdev->phys_dev;
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//struct pci_bridge_info bridge_info = {};
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struct pci_device *root_port;
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*vrp_sec_bus = 0;
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/* build pci hierarch */
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error = scan_pci();
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if (error)
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return error;
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if (!ptdev->pcie_cap) {
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pr_err("%s Error: %x:%x.%x is not a pci-e device.\n", __func__,
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phys_dev->bus, phys_dev->dev, phys_dev->func);
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@ -105,6 +160,10 @@ int ptm_probe(struct vmctx *ctx, struct passthru_dev *ptdev)
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root_port->func, phys_dev->bus, phys_dev->dev, phys_dev->func);
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return -EINVAL;
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}
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// add virtual root port
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*vrp_sec_bus = add_vroot_port(ctx, ptdev, root_port, rootport_ptm_offset);
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} else if (pcie_type == PCIEM_TYPE_ROOT_INT_EP) {
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// No need to emulate root port if ptm requestor is RCIE
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pr_notice("%s: ptm requestor is root complex integrated device.\n",
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@ -39,4 +39,4 @@ struct passthru_dev {
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bool (*has_virt_pcicfg_regs)(int offset);
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};
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#endif
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#endif
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@ -10,6 +10,6 @@
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#include "passthru.h"
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int ptm_probe(struct vmctx *ctx, struct passthru_dev *pdev);
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int ptm_probe(struct vmctx *ctx, struct passthru_dev *pdev, int *vrp_sec_bus);
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#endif
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#endif
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@ -663,6 +663,22 @@ struct acrn_intr_monitor {
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#define INTR_CMD_GET_DATA 0U
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#define INTR_CMD_DELAY_INT 1U
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/**
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* @brief Info to configure virtual root port
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*
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* Configuration passed to hv when adding a virtual root port which
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* is used as PTM root
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*/
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struct vrp_config
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{
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uint16_t phy_bdf;
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uint8_t primary_bus;
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uint8_t secondary_bus;
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uint8_t subordinate_bus;
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uint8_t ptm_capable;
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uint32_t ptm_cap_offset;
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};
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/**
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* @}
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*/
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