[Qemu-devel] [PATCH RFC V2 05/17] hw/acpi: remove from root bus 0 the crs resources used by other busses.

[Marcel Apfelbaum <marcel@redhat.com>]

If multiple root busses are used, root bus 0 cannot use all the
pci holes ranges. Remove the IO/mem ranges used by the other
primary busses.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
 hw/i386/acpi-build.c | 85 ++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 73 insertions(+), 12 deletions(-)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 0822a20..b2b0036 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -870,6 +870,9 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
     int i;
     PciRangeQ io_ranges = QLIST_HEAD_INITIALIZER(io_ranges);
     PciRangeQ mem_ranges = QLIST_HEAD_INITIALIZER(mem_ranges);
+    PciMemoryRange range;
+    PciRangeEntry *entry;
+    int root_bus_limit = 0xFF;
 
     /* The current AML generator can cover the APIC ID range [0..255],
      * inclusive, for VCPU hotplug. */
@@ -897,6 +900,10 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
                 continue;
             }
 
+            if (bus_info->bus < root_bus_limit) {
+                root_bus_limit = bus_info->bus - 1;
+            }
+
             scope = acpi_scope("\\_SB");
             dev = acpi_device("PC%.02X", (uint8_t)bus_info->bus);
             aml_append(&dev, acpi_name_decl("_UID",
@@ -911,8 +918,6 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
             aml_append(&ssdt, scope);
         }
 
-        pci_range_list_free(&io_ranges);
-        pci_range_list_free(&mem_ranges);
         qapi_free_PciInfoList(info_list);
     }
 
@@ -921,26 +926,79 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
     crs = acpi_resource_template();
     aml_append(&crs,
         acpi_word_bus_number(acpi_min_fixed, acpi_max_fixed, acpi_pos_decode,
-                             0x0000, 0x0000, 0x00FF, 0x0000, 0x0100));
+                             0x0000, 0x0, root_bus_limit,
+                             0x0000, root_bus_limit + 1));
+
     aml_append(&crs, acpi_io(acpi_decode16, 0x0CF8, 0x0CF8, 0x01, 0x08));
 
     aml_append(&crs,
         acpi_word_io(acpi_min_fixed, acpi_max_fixed,
                      acpi_pos_decode, acpi_entire_range,
                      0x0000, 0x0000, 0x0CF7, 0x0000, 0x0CF8));
-    aml_append(&crs,
-        acpi_word_io(acpi_min_fixed, acpi_max_fixed,
-                     acpi_pos_decode, acpi_entire_range,
-                     0x0000, 0x0D00, 0xFFFF, 0x0000, 0xF300));
+
+    /* prepare PCI IO ranges */
+    range.base = 0x0D00;
+    range.limit = 0xFFFF;
+    if (QLIST_EMPTY(&io_ranges)) {
+        aml_append(&crs,
+            acpi_word_io(acpi_min_fixed, acpi_max_fixed,
+                         acpi_pos_decode, acpi_entire_range,
+                         0x0000, range.base, range.limit,
+                         0x0000, range.limit - range.base + 1));
+    } else {
+        QLIST_FOREACH(entry, &io_ranges, entry) {
+            if (range.base < entry->base) {
+                aml_append(&crs,
+                    acpi_word_io(acpi_min_fixed, acpi_max_fixed,
+                                 acpi_pos_decode, acpi_entire_range,
+                                 0x0000, range.base, entry->base - 1,
+                                 0x0000, entry->base - range.base));
+            }
+            range.base = entry->limit + 1;
+            if (!QLIST_NEXT(entry, entry)) {
+                aml_append(&crs,
+                    acpi_word_io(acpi_min_fixed, acpi_max_fixed,
+                                 acpi_pos_decode, acpi_entire_range,
+                                 0x0000, range.base, range.limit,
+                                 0x0000, range.limit - range.base + 1));
+            }
+        }
+    }
+
     aml_append(&crs,
         acpi_dword_memory(acpi_pos_decode, acpi_min_fixed, acpi_max_fixed,
                           acpi_cacheable, acpi_ReadWrite,
                           0, 0x000A0000, 0x000BFFFF, 0, 0x00020000));
-    aml_append(&crs,
-        acpi_dword_memory(acpi_pos_decode, acpi_min_fixed, acpi_max_fixed,
-                          acpi_non_cacheable, acpi_ReadWrite,
-                          0, pci->w32.begin, pci->w32.end - 1, 0,
-                          pci->w32.end - pci->w32.begin));
+
+    /* prepare PCI memory ranges */
+    range.base = pci->w32.begin;
+    range.limit = pci->w32.end - 1;
+    if (QLIST_EMPTY(&mem_ranges)) {
+        aml_append(&crs,
+            acpi_dword_memory(acpi_pos_decode, acpi_min_fixed, acpi_max_fixed,
+                              acpi_non_cacheable, acpi_ReadWrite,
+                              0, range.base, range.limit,
+                              0, range.limit - range.base + 1));
+    } else {
+        QLIST_FOREACH(entry, &mem_ranges, entry) {
+            if (range.base < entry->base) {
+                aml_append(&crs,
+                    acpi_dword_memory(acpi_pos_decode, acpi_min_fixed, acpi_max_fixed,
+                                      acpi_non_cacheable, acpi_ReadWrite,
+                                      0, range.base, entry->base - 1,
+                                      0, entry->base - range.base));
+            }
+            range.base = entry->limit + 1;
+            if (!QLIST_NEXT(entry, entry)) {
+                aml_append(&crs,
+                    acpi_dword_memory(acpi_pos_decode, acpi_min_fixed, acpi_max_fixed,
+                                      acpi_non_cacheable, acpi_ReadWrite,
+                                      0, range.base, range.limit,
+                                      0, range.base - range.limit + 1));
+            }
+        }
+    }
+
     if (pci->w64.begin) {
         aml_append(&crs,
             acpi_qword_memory(acpi_pos_decode, acpi_min_fixed, acpi_max_fixed,
@@ -950,6 +1008,9 @@ build_ssdt(AcpiAml *table_aml, GArray *linker,
     }
     aml_append(&scope, acpi_name_decl("_CRS", crs));
 
+    pci_range_list_free(&io_ranges);
+    pci_range_list_free(&mem_ranges);
+
     /* reserve PCIHP resources */
     if (pm->pcihp_io_len) {
         dev = acpi_device("PHPR");
-- 
2.1.0