[RFC PATCH 26/30] coco/tdx_tsm: Add bind()/unbind()/guest_req() handlers prototype

[Xu Yilun]

Add basic skeleton for bind()/unbind()/guest_req() handlers.

Specifically, tdx_tdi_devifmt/devif_create() declare the TDI ownership
to TD. tdx_tdi_mmiomt_create() declares the MMIO ownership to TD.
tdx_tdi_request(TDX_TDI_REQ_BIND) locks the TDI.

No detailed TDX Connect implementation.

Signed-off-by: Xu Yilun <yilun...@linux.intel.com>
---
 drivers/virt/coco/host/tdx_tsm.c | 83 ++++++++++++++++++++++++++++++--
 1 file changed, 80 insertions(+), 3 deletions(-)

diff --git a/drivers/virt/coco/host/tdx_tsm.c b/drivers/virt/coco/host/tdx_tsm.c
index d1a8384d8339..beb65f45b478 100644
--- a/drivers/virt/coco/host/tdx_tsm.c
+++ b/drivers/virt/coco/host/tdx_tsm.c
@@ -44,10 +44,49 @@ static struct tdx_tdi *to_tdx_tdi(struct pci_tdi *tdi)
        return container_of(tdi, struct tdx_tdi, tdi);
 }
 
+static int tdx_tdi_devifmt_create(struct tdx_tdi *ttdi)
+{
+       return 0;
+}
+
+static void tdx_tdi_devifmt_free(struct tdx_tdi *ttdi)
+{
+}
+
+static int tdx_tdi_mmiomt_create(struct tdx_tdi *ttdi)
+{
+       return 0;
+}
+
+static void tdx_tdi_mmiomt_free(struct tdx_tdi *ttdi)
+{
+}
+
+static int tdx_tdi_devif_create(struct tdx_tdi *ttdi)
+{
+       return 0;
+}
+
+static void tdx_tdi_devif_free(struct tdx_tdi *ttdi)
+{
+}
+
+#define TDX_TDI_REQ_BIND       1
+#define TDX_TDI_REQ_START      2
+#define TDX_TDI_REQ_GET_STATE  3
+#define TDX_TDI_REQ_STOP       4
+
+static int tdx_tdi_request(struct tdx_tdi *ttdi, unsigned int req)
+{
+       return 0;
+}
+
 static struct pci_tdi *tdx_tsm_bind(struct pci_dev *pdev,
                                    struct pci_dev *dsm_dev,
                                    struct kvm *kvm, u64 tdi_id)
 {
+       int ret;
+
        struct tdx_tdi *ttdi __free(kfree) =
                kzalloc(sizeof(*ttdi), GFP_KERNEL);
        if (!ttdi)
@@ -58,17 +97,55 @@ static struct pci_tdi *tdx_tsm_bind(struct pci_dev *pdev,
        ttdi->tdi.dsm_dev = pci_dev_get(dsm_dev);
        ttdi->tdi.kvm = kvm;
 
-       /*TODO: TDX Module required operations */
+       ret = tdx_tdi_devifmt_create(ttdi);
+       if (ret) {
+               pci_err(pdev, "fail to init devifmt\n");
+               goto put_dsm_dev;
+       }
+
+       ret = tdx_tdi_devif_create(ttdi);
+       if (ret) {
+               pci_err(pdev, "%s fail to init devif\n", __func__);
+               goto devifmt_free;
+       }
+
+       ret = tdx_tdi_mmiomt_create(ttdi);
+       if (ret) {
+               pci_err(pdev, "%s fail to create mmiomt\n", __func__);
+               goto devif_free;
+       }
+
+       ret = tdx_tdi_request(ttdi, TDX_TDI_REQ_BIND);
+       if (ret) {
+               pci_err(pdev, "%s fial to request bind\n", __func__);
+               goto mmiomt_free;
+       }
 
        return &no_free_ptr(ttdi)->tdi;
+
+mmiomt_free:
+       tdx_tdi_mmiomt_free(ttdi);
+devif_free:
+       tdx_tdi_devif_free(ttdi);
+devifmt_free:
+       tdx_tdi_devifmt_free(ttdi);
+put_dsm_dev:
+       pci_dev_put(dsm_dev);
+       return NULL;
 }
 
 static void tdx_tsm_unbind(struct pci_tdi *tdi)
 {
        struct tdx_tdi *ttdi = to_tdx_tdi(tdi);
 
-       /*TODO: TDX Module required operations */
-
+       /*
+        * TODO: In fact devif cannot be freed before TDI's private MMIOs and
+        * private DMA are unmapped. Will handle this restriction later.
+        */
+       tdx_tdi_request(ttdi, TDX_TDI_REQ_STOP);
+       tdx_tdi_mmiomt_free(ttdi);
+       tdx_tdi_devif_free(ttdi);
+       tdx_tdi_devifmt_free(ttdi);
        pci_dev_put(ttdi->tdi.dsm_dev);
        kfree(ttdi);
 }
-- 
2.25.1