[v10,28/45] acpi/cxl: Introduce CFMWS structures in CEDT

Commit Message

Jonathan Cameron April 29, 2022, 2:40 p.m. UTC

From: Ben Widawsky <[e-mail]>

The CEDT CXL Fixed Window Memory Window Structures (CFMWs)
define regions of the host phyiscal address map which
(via an impdef means) are configured such that they have
a particular interleave setup across one or more CXL Host Bridges.

Reported-by: Alison Schofield <[e-mail]>
Signed-off-by: Ben Widawsky <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>
Reviewed-by: Alex Bennée <[e-mail]>
---
 hw/acpi/cxl.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

Patch

diff --git a/hw/acpi/cxl.c b/hw/acpi/cxl.c
index aa4af86a4c..31d5235136 100644
--- a/hw/acpi/cxl.c
+++ b/hw/acpi/cxl.c
@@ -60,6 +60,64 @@  static void cedt_build_chbs(GArray *table_data, PXBDev *cxl)
     build_append_int_noprefix(table_data, memory_region_size(mr), 8);
 }
 
+/*
+ * CFMWS entries in CXL 2.0 ECN: CEDT CFMWS & QTG _DSM.
+ * Interleave ways encoding in CXL 2.0 ECN: 3, 6, 12 and 16-way memory
+ * interleaving.
+ */
+static void cedt_build_cfmws(GArray *table_data, MachineState *ms)
+{
+    CXLState *cxls = ms->cxl_devices_state;
+    GList *it;
+
+    for (it = cxls->fixed_windows; it; it = it->next) {
+        CXLFixedWindow *fw = it->data;
+        int i;
+
+        /* Type */
+        build_append_int_noprefix(table_data, 1, 1);
+
+        /* Reserved */
+        build_append_int_noprefix(table_data, 0, 1);
+
+        /* Record Length */
+        build_append_int_noprefix(table_data, 36 + 4 * fw->num_targets, 2);
+
+        /* Reserved */
+        build_append_int_noprefix(table_data, 0, 4);
+
+        /* Base HPA */
+        build_append_int_noprefix(table_data, fw->mr.addr, 8);
+
+        /* Window Size */
+        build_append_int_noprefix(table_data, fw->size, 8);
+
+        /* Host Bridge Interleave Ways */
+        build_append_int_noprefix(table_data, fw->enc_int_ways, 1);
+
+        /* Host Bridge Interleave Arithmetic */
+        build_append_int_noprefix(table_data, 0, 1);
+
+        /* Reserved */
+        build_append_int_noprefix(table_data, 0, 2);
+
+        /* Host Bridge Interleave Granularity */
+        build_append_int_noprefix(table_data, fw->enc_int_gran, 4);
+
+        /* Window Restrictions */
+        build_append_int_noprefix(table_data, 0x0f, 2); /* No restrictions */
+
+        /* QTG ID */
+        build_append_int_noprefix(table_data, 0, 2);
+
+        /* Host Bridge List (list of UIDs - currently bus_nr) */
+        for (i = 0; i < fw->num_targets; i++) {
+            g_assert(fw->target_hbs[i]);
+            build_append_int_noprefix(table_data, fw->target_hbs[i]->bus_nr, 4);
+        }
+    }
+}
+
 static int cxl_foreach_pxb_hb(Object *obj, void *opaque)
 {
     Aml *cedt = opaque;
@@ -86,6 +144,7 @@  void cxl_build_cedt(MachineState *ms, GArray *table_offsets, GArray *table_data,
     /* reserve space for CEDT header */
 
     object_child_foreach_recursive(object_get_root(), cxl_foreach_pxb_hb, cedt);
+    cedt_build_cfmws(cedt->buf, ms);
 
     /* copy AML table into ACPI tables blob and patch header there */
     g_array_append_vals(table_data, cedt->buf->data, cedt->buf->len);