acpi: Extract crs build form acpi_build.c

Extract crs build form acpi_build.c, the function could also be used
to build the crs for pxbs for arm. The resources are composed by two parts:
1. The bar space of pci-bridge/pcie-root-ports
2. The resources needed by devices behind PXBs.
The base and limit of memory/io are obtained from the config via two APIs:
pci_bridge_get_base and pci_bridge_get_limit

Signed-off-by: Yubo Miao <miaoyubo@huawei.com>
Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Message-Id: <20201119014841.7298-5-cenjiahui@huawei.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 285 insertions, 0 deletions

diff --git a/hw/acpi/aml-build.c b/hw/acpi/aml-build.c
index 3792ba9..f976aa6 100644
--- a/hw/acpi/aml-build.c
+++ b/hw/acpi/aml-build.c
@@ -27,6 +27,9 @@
 #include "sysemu/numa.h"
 #include "hw/boards.h"
 #include "hw/acpi/tpm.h"
+#include "hw/pci/pci_host.h"
+#include "hw/pci/pci_bus.h"
+#include "hw/pci/pci_bridge.h"
 
 static GArray *build_alloc_array(void)
 {
@@ -55,6 +58,128 @@ static void build_append_array(GArray *array, GArray *val)
 
 #define ACPI_NAMESEG_LEN 4
 
+void crs_range_insert(GPtrArray *ranges, uint64_t base, uint64_t limit)
+{
+    CrsRangeEntry *entry;
+
+    entry = g_malloc(sizeof(*entry));
+    entry->base = base;
+    entry->limit = limit;
+
+    g_ptr_array_add(ranges, entry);
+}
+
+static void crs_range_free(gpointer data)
+{
+    CrsRangeEntry *entry = (CrsRangeEntry *)data;
+    g_free(entry);
+}
+
+void crs_range_set_init(CrsRangeSet *range_set)
+{
+    range_set->io_ranges = g_ptr_array_new_with_free_func(crs_range_free);
+    range_set->mem_ranges = g_ptr_array_new_with_free_func(crs_range_free);
+    range_set->mem_64bit_ranges =
+            g_ptr_array_new_with_free_func(crs_range_free);
+}
+
+void crs_range_set_free(CrsRangeSet *range_set)
+{
+    g_ptr_array_free(range_set->io_ranges, true);
+    g_ptr_array_free(range_set->mem_ranges, true);
+    g_ptr_array_free(range_set->mem_64bit_ranges, true);
+}
+
+static gint crs_range_compare(gconstpointer a, gconstpointer b)
+{
+    CrsRangeEntry *entry_a = *(CrsRangeEntry **)a;
+    CrsRangeEntry *entry_b = *(CrsRangeEntry **)b;
+
+    if (entry_a->base < entry_b->base) {
+        return -1;
+    } else if (entry_a->base > entry_b->base) {
+        return 1;
+    } else {
+        return 0;
+    }
+}
+
+/*
+ * crs_replace_with_free_ranges - given the 'used' ranges within [start - end]
+ * interval, computes the 'free' ranges from the same interval.
+ * Example: If the input array is { [a1 - a2],[b1 - b2] }, the function
+ * will return { [base - a1], [a2 - b1], [b2 - limit] }.
+ */
+void crs_replace_with_free_ranges(GPtrArray *ranges,
+                                  uint64_t start, uint64_t end)
+{
+    GPtrArray *free_ranges = g_ptr_array_new();
+    uint64_t free_base = start;
+    int i;
+
+    g_ptr_array_sort(ranges, crs_range_compare);
+    for (i = 0; i < ranges->len; i++) {
+        CrsRangeEntry *used = g_ptr_array_index(ranges, i);
+
+        if (free_base < used->base) {
+            crs_range_insert(free_ranges, free_base, used->base - 1);
+        }
+
+        free_base = used->limit + 1;
+    }
+
+    if (free_base < end) {
+        crs_range_insert(free_ranges, free_base, end);
+    }
+
+    g_ptr_array_set_size(ranges, 0);
+    for (i = 0; i < free_ranges->len; i++) {
+        g_ptr_array_add(ranges, g_ptr_array_index(free_ranges, i));
+    }
+
+    g_ptr_array_free(free_ranges, true);
+}
+
+/*
+ * crs_range_merge - merges adjacent ranges in the given array.
+ * Array elements are deleted and replaced with the merged ranges.
+ */
+static void crs_range_merge(GPtrArray *range)
+{
+    GPtrArray *tmp = g_ptr_array_new_with_free_func(crs_range_free);
+    CrsRangeEntry *entry;
+    uint64_t range_base, range_limit;
+    int i;
+
+    if (!range->len) {
+        return;
+    }
+
+    g_ptr_array_sort(range, crs_range_compare);
+
+    entry = g_ptr_array_index(range, 0);
+    range_base = entry->base;
+    range_limit = entry->limit;
+    for (i = 1; i < range->len; i++) {
+        entry = g_ptr_array_index(range, i);
+        if (entry->base - 1 == range_limit) {
+            range_limit = entry->limit;
+        } else {
+            crs_range_insert(tmp, range_base, range_limit);
+            range_base = entry->base;
+            range_limit = entry->limit;
+        }
+    }
+    crs_range_insert(tmp, range_base, range_limit);
+
+    g_ptr_array_set_size(range, 0);
+    for (i = 0; i < tmp->len; i++) {
+        entry = g_ptr_array_index(tmp, i);
+        crs_range_insert(range, entry->base, entry->limit);
+    }
+    g_ptr_array_free(tmp, true);
+}
+
 static void
 build_append_nameseg(GArray *array, const char *seg)
 {
@@ -1951,6 +2076,166 @@ void build_tpm2(GArray *table_data, BIOSLinker *linker, GArray *tcpalog)
                  tpm2_ptr, "TPM2", table_data->len - tpm2_start, 4, NULL, NULL);
 }
 
+Aml *build_crs(PCIHostState *host, CrsRangeSet *range_set)
+{
+    Aml *crs = aml_resource_template();
+    CrsRangeSet temp_range_set;
+    CrsRangeEntry *entry;
+    uint8_t max_bus = pci_bus_num(host->bus);
+    uint8_t type;
+    int devfn;
+    int i;
+
+    crs_range_set_init(&temp_range_set);
+    for (devfn = 0; devfn < ARRAY_SIZE(host->bus->devices); devfn++) {
+        uint64_t range_base, range_limit;
+        PCIDevice *dev = host->bus->devices[devfn];
+
+        if (!dev) {
+            continue;
+        }
+
+        for (i = 0; i < PCI_NUM_REGIONS; i++) {
+            PCIIORegion *r = &dev->io_regions[i];
+
+            range_base = r->addr;
+            range_limit = r->addr + r->size - 1;
+
+            /*
+             * Work-around for old bioses
+             * that do not support multiple root buses
+             */
+            if (!range_base || range_base > range_limit) {
+                continue;
+            }
+
+            if (r->type & PCI_BASE_ADDRESS_SPACE_IO) {
+                crs_range_insert(temp_range_set.io_ranges,
+                                 range_base, range_limit);
+            } else { /* "memory" */
+                uint64_t length = range_limit - range_base + 1;
+                if (range_limit <= UINT32_MAX && length <= UINT32_MAX) {
+                    crs_range_insert(temp_range_set.mem_ranges, range_base,
+                                     range_limit);
+                } else {
+                    crs_range_insert(temp_range_set.mem_64bit_ranges,
+                                     range_base, range_limit);
+                }
+            }
+        }
+
+        type = dev->config[PCI_HEADER_TYPE] & ~PCI_HEADER_TYPE_MULTI_FUNCTION;
+        if (type == PCI_HEADER_TYPE_BRIDGE) {
+            uint8_t subordinate = dev->config[PCI_SUBORDINATE_BUS];
+            if (subordinate > max_bus) {
+                max_bus = subordinate;
+            }
+
+            range_base = pci_bridge_get_base(dev, PCI_BASE_ADDRESS_SPACE_IO);
+            range_limit = pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_SPACE_IO);
+
+             /*
+              * Work-around for old bioses
+              * that do not support multiple root buses
+              */
+            if (range_base && range_base <= range_limit) {
+                crs_range_insert(temp_range_set.io_ranges,
+                                 range_base, range_limit);
+            }
+
+            range_base =
+                pci_bridge_get_base(dev, PCI_BASE_ADDRESS_SPACE_MEMORY);
+            range_limit =
+                pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_SPACE_MEMORY);
+
+            /*
+             * Work-around for old bioses
+             * that do not support multiple root buses
+             */
+            if (range_base && range_base <= range_limit) {
+                uint64_t length = range_limit - range_base + 1;
+                if (range_limit <= UINT32_MAX && length <= UINT32_MAX) {
+                    crs_range_insert(temp_range_set.mem_ranges,
+                                     range_base, range_limit);
+                } else {
+                    crs_range_insert(temp_range_set.mem_64bit_ranges,
+                                     range_base, range_limit);
+                }
+            }
+
+            range_base =
+                pci_bridge_get_base(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
+            range_limit =
+                pci_bridge_get_limit(dev, PCI_BASE_ADDRESS_MEM_PREFETCH);
+
+            /*
+             * Work-around for old bioses
+             * that do not support multiple root buses
+             */
+            if (range_base && range_base <= range_limit) {
+                uint64_t length = range_limit - range_base + 1;
+                if (range_limit <= UINT32_MAX && length <= UINT32_MAX) {
+                    crs_range_insert(temp_range_set.mem_ranges,
+                                     range_base, range_limit);
+                } else {
+                    crs_range_insert(temp_range_set.mem_64bit_ranges,
+                                     range_base, range_limit);
+                }
+            }
+        }
+    }
+
+    crs_range_merge(temp_range_set.io_ranges);
+    for (i = 0; i < temp_range_set.io_ranges->len; i++) {
+        entry = g_ptr_array_index(temp_range_set.io_ranges, i);
+        aml_append(crs,
+                   aml_word_io(AML_MIN_FIXED, AML_MAX_FIXED,
+                               AML_POS_DECODE, AML_ENTIRE_RANGE,
+                               0, entry->base, entry->limit, 0,
+                               entry->limit - entry->base + 1));
+        crs_range_insert(range_set->io_ranges, entry->base, entry->limit);
+    }
+
+    crs_range_merge(temp_range_set.mem_ranges);
+    for (i = 0; i < temp_range_set.mem_ranges->len; i++) {
+        entry = g_ptr_array_index(temp_range_set.mem_ranges, i);
+        assert(entry->limit <= UINT32_MAX &&
+               (entry->limit - entry->base + 1) <= UINT32_MAX);
+        aml_append(crs,
+                   aml_dword_memory(AML_POS_DECODE, AML_MIN_FIXED,
+                                    AML_MAX_FIXED, AML_NON_CACHEABLE,
+                                    AML_READ_WRITE,
+                                    0, entry->base, entry->limit, 0,
+                                    entry->limit - entry->base + 1));
+        crs_range_insert(range_set->mem_ranges, entry->base, entry->limit);
+    }
+
+    crs_range_merge(temp_range_set.mem_64bit_ranges);
+    for (i = 0; i < temp_range_set.mem_64bit_ranges->len; i++) {
+        entry = g_ptr_array_index(temp_range_set.mem_64bit_ranges, i);
+        aml_append(crs,
+                   aml_qword_memory(AML_POS_DECODE, AML_MIN_FIXED,
+                                    AML_MAX_FIXED, AML_NON_CACHEABLE,
+                                    AML_READ_WRITE,
+                                    0, entry->base, entry->limit, 0,
+                                    entry->limit - entry->base + 1));
+        crs_range_insert(range_set->mem_64bit_ranges,
+                         entry->base, entry->limit);
+    }
+
+    crs_range_set_free(&temp_range_set);
+
+    aml_append(crs,
+        aml_word_bus_number(AML_MIN_FIXED, AML_MAX_FIXED, AML_POS_DECODE,
+                            0,
+                            pci_bus_num(host->bus),
+                            max_bus,
+                            0,
+                            max_bus - pci_bus_num(host->bus) + 1));
+
+    return crs;
+}
+
 /* ACPI 5.0: 6.4.3.8.2 Serial Bus Connection Descriptors */
 static Aml *aml_serial_bus_device(uint8_t serial_bus_type, uint8_t flags,
                                   uint16_t type_flags,