[PULL 26/68] pcie: Support PCIe Gen5/Gen6 link speeds

[Michael S. Tsirkin]

From: Lukas Stockner <lstockner@genesiscloud.com>

This patch extends the PCIe link speed option so that slots can be
configured as supporting 32GT/s (Gen5) or 64GT/s (Gen5) speeds.
This is as simple as setting the appropriate bit in LnkCap2 and
the appropriate value in LnkCap and LnkCtl2.

Signed-off-by: Lukas Stockner <lstockner@genesiscloud.com>
Message-Id: <20240215012326.3272366-1-lstockner@genesiscloud.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 qapi/common.json                 |  6 +++++-
 include/hw/pci/pcie_regs.h       |  2 ++
 hw/core/qdev-properties-system.c | 16 ++++++++++++++--
 hw/pci/pcie.c                    |  8 ++++++++
 4 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/qapi/common.json b/qapi/common.json
index f1bb841951..867a9ad9b0 100644
--- a/qapi/common.json
+++ b/qapi/common.json
@@ -107,10 +107,14 @@
 #
 # @16: 16.0GT/s
 #
+# @32: 32.0GT/s
+#
+# @64: 64.0GT/s
+#
 # Since: 4.0
 ##
 { 'enum': 'PCIELinkSpeed',
-  'data': [ '2_5', '5', '8', '16' ] }
+  'data': [ '2_5', '5', '8', '16', '32', '64' ] }
 
 ##
 # @PCIELinkWidth:
diff --git a/include/hw/pci/pcie_regs.h b/include/hw/pci/pcie_regs.h
index 4972106c42..9d3b6868dc 100644
--- a/include/hw/pci/pcie_regs.h
+++ b/include/hw/pci/pcie_regs.h
@@ -39,6 +39,8 @@ typedef enum PCIExpLinkSpeed {
     QEMU_PCI_EXP_LNK_5GT,
     QEMU_PCI_EXP_LNK_8GT,
     QEMU_PCI_EXP_LNK_16GT,
+    QEMU_PCI_EXP_LNK_32GT,
+    QEMU_PCI_EXP_LNK_64GT,
 } PCIExpLinkSpeed;
 
 #define QEMU_PCI_EXP_LNKCAP_MLS(speed)  (speed)
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index b45e90edb2..28ce6162c7 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -955,7 +955,7 @@ const PropertyInfo qdev_prop_off_auto_pcibar = {
     .set_default_value = qdev_propinfo_set_default_value_enum,
 };
 
-/* --- PCIELinkSpeed 2_5/5/8/16 -- */
+/* --- PCIELinkSpeed 2_5/5/8/16/32/64 -- */
 
 static void get_prop_pcielinkspeed(Object *obj, Visitor *v, const char *name,
                                    void *opaque, Error **errp)
@@ -977,6 +977,12 @@ static void get_prop_pcielinkspeed(Object *obj, Visitor 
*v, const char *name,
     case QEMU_PCI_EXP_LNK_16GT:
         speed = PCIE_LINK_SPEED_16;
         break;
+    case QEMU_PCI_EXP_LNK_32GT:
+        speed = PCIE_LINK_SPEED_32;
+        break;
+    case QEMU_PCI_EXP_LNK_64GT:
+        speed = PCIE_LINK_SPEED_64;
+        break;
     default:
         /* Unreachable */
         abort();
@@ -1010,6 +1016,12 @@ static void set_prop_pcielinkspeed(Object *obj, Visitor 
*v, const char *name,
     case PCIE_LINK_SPEED_16:
         *p = QEMU_PCI_EXP_LNK_16GT;
         break;
+    case PCIE_LINK_SPEED_32:
+        *p = QEMU_PCI_EXP_LNK_32GT;
+        break;
+    case PCIE_LINK_SPEED_64:
+        *p = QEMU_PCI_EXP_LNK_64GT;
+        break;
     default:
         /* Unreachable */
         abort();
@@ -1018,7 +1030,7 @@ static void set_prop_pcielinkspeed(Object *obj, Visitor 
*v, const char *name,
 
 const PropertyInfo qdev_prop_pcie_link_speed = {
     .name = "PCIELinkSpeed",
-    .description = "2_5/5/8/16",
+    .description = "2_5/5/8/16/32/64",
     .enum_table = &PCIELinkSpeed_lookup,
     .get = get_prop_pcielinkspeed,
     .set = set_prop_pcielinkspeed,
diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c
index 6db0cf69cd..0b4817e144 100644
--- a/hw/pci/pcie.c
+++ b/hw/pci/pcie.c
@@ -153,6 +153,14 @@ static void pcie_cap_fill_slot_lnk(PCIDevice *dev)
             pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2,
                                        PCI_EXP_LNKCAP2_SLS_16_0GB);
         }
+        if (s->speed > QEMU_PCI_EXP_LNK_16GT) {
+            pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2,
+                                       PCI_EXP_LNKCAP2_SLS_32_0GB);
+        }
+        if (s->speed > QEMU_PCI_EXP_LNK_32GT) {
+            pci_long_test_and_set_mask(exp_cap + PCI_EXP_LNKCAP2,
+                                       PCI_EXP_LNKCAP2_SLS_64_0GB);
+        }
     }
 }
 
-- 
MST