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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [RFC XEN PATCH v3 35/39] tools/libacpi: load ACPI built by the device model
ACPI tables built by the device model, whose signatures do not
conflict with tables built by Xen except SSDT, are loaded after ACPI
tables built by Xen.
ACPI namespace devices built by the device model, whose names do not
conflict with devices built by Xen, are assembled and placed in SSDTs
after ACPI tables built by Xen.
Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
---
tools/firmware/hvmloader/util.c | 15 +++
tools/libacpi/acpi2_0.h | 2 +
tools/libacpi/build.c | 237 ++++++++++++++++++++++++++++++++++++++++
tools/libacpi/libacpi.h | 5 +
4 files changed, 259 insertions(+)
diff --git a/tools/firmware/hvmloader/util.c b/tools/firmware/hvmloader/util.c
index 5b8a4ee9d0..0468fea490 100644
--- a/tools/firmware/hvmloader/util.c
+++ b/tools/firmware/hvmloader/util.c
@@ -1019,6 +1019,21 @@ void hvmloader_acpi_build_tables(struct acpi_config
*config,
if ( !strncmp(xenstore_read("platform/acpi_laptop_slate", "0"), "1", 1) )
config->table_flags |= ACPI_HAS_SSDT_LAPTOP_SLATE;
+ s = xenstore_read(HVM_XS_DM_ACPI_ADDRESS, NULL);
+ if ( s )
+ {
+ config->dm.addr = strtoll(s, NULL, 0);
+
+ s = xenstore_read(HVM_XS_DM_ACPI_LENGTH, NULL);
+ if ( s )
+ {
+ config->dm.length = strtoll(s, NULL, 0);
+ config->table_flags |= ACPI_HAS_DM;
+ }
+ else
+ config->dm.addr = 0;
+ }
+
config->table_flags |= (ACPI_HAS_TCPA | ACPI_HAS_IOAPIC |
ACPI_HAS_WAET | ACPI_HAS_PMTIMER |
ACPI_HAS_BUTTONS | ACPI_HAS_VGA |
diff --git a/tools/libacpi/acpi2_0.h b/tools/libacpi/acpi2_0.h
index 2619ba32db..365825e6bc 100644
--- a/tools/libacpi/acpi2_0.h
+++ b/tools/libacpi/acpi2_0.h
@@ -435,6 +435,7 @@ struct acpi_20_slit {
#define ACPI_2_0_WAET_SIGNATURE ASCII32('W','A','E','T')
#define ACPI_2_0_SRAT_SIGNATURE ASCII32('S','R','A','T')
#define ACPI_2_0_SLIT_SIGNATURE ASCII32('S','L','I','T')
+#define ACPI_2_0_SSDT_SIGNATURE ASCII32('S','S','D','T')
/*
* Table revision numbers.
@@ -449,6 +450,7 @@ struct acpi_20_slit {
#define ACPI_1_0_FADT_REVISION 0x01
#define ACPI_2_0_SRAT_REVISION 0x01
#define ACPI_2_0_SLIT_REVISION 0x01
+#define ACPI_2_0_SSDT_REVISION 0x02
#pragma pack ()
diff --git a/tools/libacpi/build.c b/tools/libacpi/build.c
index 493ca48025..8ec1dfda5f 100644
--- a/tools/libacpi/build.c
+++ b/tools/libacpi/build.c
@@ -15,6 +15,7 @@
#include LIBACPI_STDUTILS
#include "acpi2_0.h"
+#include "aml_build.h"
#include "libacpi.h"
#include "ssdt_s3.h"
#include "ssdt_s4.h"
@@ -56,6 +57,9 @@ struct acpi_info {
uint64_t pci_hi_min, pci_hi_len; /* 24, 32 - PCI I/O hole boundaries */
};
+#define DM_ACPI_BLOB_TYPE_TABLE 0 /* ACPI table */
+#define DM_ACPI_BLOB_TYPE_NSDEV 1 /* AML of an ACPI namespace device */
+
/* ACPI tables of following signatures should not appear in DM ACPI */
static uint64_t dm_acpi_signature_blacklist[64];
/* ACPI namespace devices of following names should not appear in DM ACPI */
@@ -141,6 +145,233 @@ static void set_checksum(
p[checksum_offset] = -sum;
}
+static bool has_dm_tables(struct acpi_ctxt *ctxt,
+ const struct acpi_config *config)
+{
+ char **dir;
+ unsigned int num;
+
+ if ( !(config->table_flags & ACPI_HAS_DM) || !config->dm.addr )
+ return false;
+
+ dir = ctxt->xs_ops.directory(ctxt, HVM_XS_DM_ACPI_ROOT, &num);
+ if ( !dir || !num )
+ return false;
+
+ return true;
+}
+
+/* Return true if no collision is found. */
+static bool check_signature_collision(uint64_t sig)
+{
+ unsigned int i;
+ for ( i = 0; i < ARRAY_SIZE(dm_acpi_signature_blacklist); i++ )
+ {
+ if ( sig == dm_acpi_signature_blacklist[i] )
+ return false;
+ }
+ return true;
+}
+
+/* Return true if no collision is found. */
+static int check_devname_collision(const char *name)
+{
+ unsigned int i;
+ for ( i = 0; i < ARRAY_SIZE(dm_acpi_devname_blacklist); i++ )
+ {
+ if ( !strncmp(name, dm_acpi_devname_blacklist[i], 4) )
+ return false;
+ }
+ return true;
+}
+
+static const char *xs_read_dm_acpi_blob_key(struct acpi_ctxt *ctxt,
+ const char *name, const char *key)
+{
+/*
+ * @name is supposed to be 4 characters at most, and the longest @key
+ * so far is 'address' (7), so 30 characters is enough to hold the
+ * longest path HVM_XS_DM_ACPI_ROOT/name/key.
+ */
+#define DM_ACPI_BLOB_PATH_MAX_LENGTH 30
+ char path[DM_ACPI_BLOB_PATH_MAX_LENGTH];
+ snprintf(path, DM_ACPI_BLOB_PATH_MAX_LENGTH, HVM_XS_DM_ACPI_ROOT"/%s/%s",
+ name, key);
+ return ctxt->xs_ops.read(ctxt, path);
+}
+
+static bool construct_dm_table(struct acpi_ctxt *ctxt,
+ unsigned long *table_ptrs,
+ unsigned int nr_tables,
+ const void *blob, uint32_t length)
+{
+ const struct acpi_header *header = blob;
+ uint8_t *buffer;
+
+ if ( !check_signature_collision(header->signature) )
+ return false;
+
+ if ( header->length > length || header->length == 0 )
+ return false;
+
+ buffer = ctxt->mem_ops.alloc(ctxt, header->length, 16);
+ if ( !buffer )
+ return false;
+ memcpy(buffer, header, header->length);
+
+ /* some device models (e.g. QEMU) does not set checksum */
+ set_checksum(buffer, offsetof(struct acpi_header, checksum),
+ header->length);
+
+ table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, buffer);
+
+ return true;
+}
+
+static bool construct_dm_nsdev(struct acpi_ctxt *ctxt,
+ unsigned long *table_ptrs,
+ unsigned int nr_tables,
+ const char *dev_name,
+ const void *blob, uint32_t blob_length)
+{
+ struct acpi_header ssdt, *header;
+ uint8_t *buffer;
+ int rc;
+
+ if ( !check_devname_collision(dev_name) )
+ return false;
+
+#define AML_BUILD(STMT) \
+ do { \
+ rc = STMT; \
+ if ( rc ) \
+ goto out; \
+ } while (0)
+
+ /* built ACPI namespace device from [name, blob] */
+ buffer = aml_build_begin(ctxt);
+ if ( !buffer )
+ return false;
+
+ AML_BUILD(aml_prepend_blob(buffer, blob, blob_length));
+ AML_BUILD(aml_prepend_device(buffer, dev_name));
+ AML_BUILD((aml_prepend_scope(buffer, "\\_SB")));
+
+ /* build SSDT header */
+ ssdt.signature = ACPI_2_0_SSDT_SIGNATURE;
+ ssdt.revision = ACPI_2_0_SSDT_REVISION;
+ fixed_strcpy(ssdt.oem_id, ACPI_OEM_ID);
+ fixed_strcpy(ssdt.oem_table_id, ACPI_OEM_TABLE_ID);
+ ssdt.oem_revision = ACPI_OEM_REVISION;
+ ssdt.creator_id = ACPI_CREATOR_ID;
+ ssdt.creator_revision = ACPI_CREATOR_REVISION;
+
+ /* prepend SSDT header to ACPI namespace device */
+ AML_BUILD(aml_prepend_blob(buffer, &ssdt, sizeof(ssdt)));
+ header = (struct acpi_header *) buffer;
+
+out:
+ header->length = aml_build_end();
+
+ if ( rc )
+ return false;
+
+ /* calculate checksum of SSDT */
+ set_checksum(header, offsetof(struct acpi_header, checksum),
+ header->length);
+
+ table_ptrs[nr_tables++] = ctxt->mem_ops.v2p(ctxt, buffer);
+
+ return true;
+}
+
+/*
+ * All ACPI stuffs built by the device model are placed in the guest
+ * buffer whose address and size are specified by config->dm.{addr, length},
+ * or XenStore keys HVM_XS_DM_ACPI_{ADDRESS, LENGTH}.
+ *
+ * The data layout within the buffer is further specified by XenStore
+ * directories under HVM_XS_DM_ACPI_ROOT. Each directory specifies a
+ * data blob and contains following XenStore keys:
+ *
+ * - "type":
+ * * DM_ACPI_BLOB_TYPE_TABLE
+ * The data blob specified by this directory is an ACPI table.
+ * * DM_ACPI_BLOB_TYPE_NSDEV
+ * The data blob specified by this directory is an ACPI namespace device.
+ * Its name is specified by the directory name, while the AML code of the
+ * body of the AML device structure is in the data blob.
+ *
+ * - "length": the number of bytes in this data blob.
+ *
+ * - "offset": the offset in bytes of this data blob from the beginning of
buffer
+ */
+static int construct_dm_tables(struct acpi_ctxt *ctxt,
+ unsigned long *table_ptrs,
+ unsigned int nr_tables,
+ struct acpi_config *config)
+{
+ const char *s;
+ char **dir;
+ uint8_t type;
+ void *blob;
+ unsigned int num, length, offset, i, nr_added = 0;
+
+ if ( !config->dm.addr )
+ return 0;
+
+ dir = ctxt->xs_ops.directory(ctxt, HVM_XS_DM_ACPI_ROOT, &num);
+ if ( !dir || !num )
+ return 0;
+
+ if ( num > ACPI_MAX_SECONDARY_TABLES - nr_tables )
+ return 0;
+
+ for ( i = 0; i < num; i++, dir++ )
+ {
+ if ( *dir == NULL )
+ continue;
+
+ s = xs_read_dm_acpi_blob_key(ctxt, *dir, "type");
+ if ( !s )
+ continue;
+ type = (uint8_t)strtoll(s, NULL, 0);
+
+ s = xs_read_dm_acpi_blob_key(ctxt, *dir, "length");
+ if ( !s )
+ continue;
+ length = (uint32_t)strtoll(s, NULL, 0);
+
+ s = xs_read_dm_acpi_blob_key(ctxt, *dir, "offset");
+ if ( !s )
+ continue;
+ offset = (uint32_t)strtoll(s, NULL, 0);
+
+ blob = ctxt->mem_ops.p2v(ctxt, config->dm.addr + offset);
+
+ switch ( type )
+ {
+ case DM_ACPI_BLOB_TYPE_TABLE:
+ nr_added += construct_dm_table(ctxt,
+ table_ptrs, nr_tables + nr_added,
+ blob, length);
+ break;
+
+ case DM_ACPI_BLOB_TYPE_NSDEV:
+ nr_added += construct_dm_nsdev(ctxt,
+ table_ptrs, nr_tables + nr_added,
+ *dir, blob, length);
+ break;
+
+ default:
+ /* skip blobs of unknown types */
+ continue;
+ }
+ }
+
+ return nr_added;
+}
+
static struct acpi_20_madt *construct_madt(struct acpi_ctxt *ctxt,
const struct acpi_config *config,
struct acpi_info *info)
@@ -556,6 +787,9 @@ static int construct_secondary_tables(struct acpi_ctxt
*ctxt,
nr_tables += construct_passthrough_tables(ctxt, table_ptrs,
nr_tables, config);
+ /* Load ACPI passed from device model (e.g. NFIT from QEMU). */
+ nr_tables += construct_dm_tables(ctxt, table_ptrs, nr_tables, config);
+
table_ptrs[nr_tables] = 0;
return nr_tables;
}
@@ -620,6 +854,9 @@ int acpi_build_tables(struct acpi_ctxt *ctxt, struct
acpi_config *config)
acpi_info->pci_hi_len = config->pci_hi_len;
}
+ if ( !has_dm_tables(ctxt, config) )
+ config->table_flags &= ~ACPI_HAS_DM;
+
/*
* Fill in high-memory data structures, starting at @buf.
*/
diff --git a/tools/libacpi/libacpi.h b/tools/libacpi/libacpi.h
index 87f311bfab..cd134ff2cf 100644
--- a/tools/libacpi/libacpi.h
+++ b/tools/libacpi/libacpi.h
@@ -93,6 +93,11 @@ struct acpi_config {
uint32_t length;
} pt;
+ struct {
+ uint32_t addr;
+ uint32_t length;
+ } dm;
+
struct acpi_numa numa;
const struct hvm_info_table *hvminfo;
--
2.14.1
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