[PATCH v3 28/57] acpi: Add more support for generating processor tables

[Simon Glass <sjg@chromium.org>]

This adds tables relating to P-States and C-States.

Signed-off-by: Simon Glass <sjg@chromium.org>
---

(no changes since v1)

 include/acpi/acpigen.h | 162 +++++++++++++++++++++++
 lib/acpi/acpigen.c     | 167 +++++++++++++++++++++++
 test/dm/acpigen.c      | 294 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 623 insertions(+)

diff --git a/include/acpi/acpigen.h b/include/acpi/acpigen.h
index 3a2c6339d5e..976f4dbb9af 100644
--- a/include/acpi/acpigen.h
+++ b/include/acpi/acpigen.h
@@ -10,8 +10,10 @@
 #ifndef __ACPI_ACPIGEN_H
 #define __ACPI_ACPIGEN_H
 
+#include <acpi/acpi_table.h>
 #include <linux/types.h>
 
+struct acpi_cstate;
 struct acpi_ctx;
 struct acpi_gen_regaddr;
 struct acpi_gpio;
@@ -87,6 +89,53 @@ enum psd_coord {
 	HW_ALL = 0xfe
 };
 
+/**
+ * enum csd_coord -  Coordination types for C-states
+ *
+ * The type of coordination that exists (hardware) or is required (software) as
+ * a result of the underlying hardware dependency
+ */
+enum csd_coord {
+	CSD_HW_ALL = 0xfe,
+};
+
+/**
+ * struct acpi_cstate - Information about a C-State
+ *
+ * @ctype: C State type (1=C1, 2=C2, 3=C3)
+ * @latency: Worst-case latency to enter and exit the C State (in uS)
+ * @power: Average power consumption of the processor when in this C-State (mW)
+ * @resource: Register to read to place the processor in this state
+ */
+struct acpi_cstate {
+	uint ctype;
+	uint latency;
+	uint power;
+	struct acpi_gen_regaddr resource;
+};
+
+/**
+ * struct acpi_tstate - Information about a Throttling Supported State
+ *
+ * See ACPI v6.3 section 8.4.5.2: _TSS (Throttling Supported States)
+ *
+ * @percent: Percent of the core CPU operating frequency that will be
+ *	available when this throttling state is invoked
+ * @power: Throttling state?s maximum power dissipation (mw)
+ * @latency: Worst-case latency (uS) that the CPU is unavailable during a
+ *	transition from any throttling state to this throttling state
+ * @control: Value to be written to the Processor Control Register
+ *	(THROTTLE_CTRL) to initiate a transition to this throttling state
+ * @status: Value in THROTTLE_STATUS when in this state
+ */
+struct acpi_tstate {
+	uint percent;
+	uint power;
+	uint latency;
+	uint control;
+	uint status;
+};
+
 /**
  * acpigen_get_current() - Get the current ACPI code output pointer
  *
@@ -816,4 +865,117 @@ void acpigen_write_processor_package(struct acpi_ctx *ctx, const char *name,
  */
 void acpigen_write_processor_cnot(struct acpi_ctx *ctx, const uint num_cores);
 
+/**
+ * acpigen_write_ppc() - generates a function returning max P-states
+ *
+ * @ctx: ACPI context pointer
+ * @num_pstates: Number of pstates to return
+ */
+void acpigen_write_ppc(struct acpi_ctx *ctx, uint num_pstates);
+
+/**
+ * acpigen_write_ppc() - generates a function returning PPCM
+ *
+ * This returns the maximum number of supported P-states, as saved in the
+ * variable PPCM
+ *
+ * @ctx: ACPI context pointer
+ */
+void acpigen_write_ppc_nvs(struct acpi_ctx *ctx);
+
+/**
+ * acpigen_write_tpc() - Write a _TPC method that returns the TPC limit
+ *
+ * @ctx: ACPI context pointer
+ * @gnvs_tpc_limit: Variable that holds the TPC limit
+ */
+void acpigen_write_tpc(struct acpi_ctx *ctx, const char *gnvs_tpc_limit);
+
+/**
+ * acpigen_write_pss_package() - Write a PSS package
+ *
+ * See ACPI v6.3 section 8.4.6: Processor Performance Control
+ *
+ * @ctx: ACPI context pointer
+ * @corefreq: CPU core frequency in MHz
+ * @translat: worst-case latency in uS that the CPU is unavailable during a
+ *	transition from any performance state to this performance state
+ * @busmlat: worst-case latency in microseconds that Bus Masters are prevented
+ *	from accessing memory during a transition from any performance state to
+ *	this performance state
+ * @control: Value to write to PERF_CTRL to move to this performance state
+ * @status: Expected PERF_STATUS value when in this state
+ */
+void acpigen_write_pss_package(struct acpi_ctx *ctx, uint corefreq, uint power,
+			       uint translat, uint busmlat, uint control,
+			       uint status);
+
+/**
+ * acpigen_write_psd_package() - Write a PSD package
+ *
+ * Writes a P-State dependency package
+ *
+ * See ACPI v6.3 section 8.4.6.5: _PSD (P-State Dependency)
+ *
+ * @ctx: ACPI context pointer
+ * @domain: Dependency domain number to which this P state entry belongs
+ * @numprocs: Number of processors belonging to the domain for this logical
+ *	processor?s P-states
+ * @coordtype: Coordination type
+ */
+void acpigen_write_psd_package(struct acpi_ctx *ctx, uint domain, uint numprocs,
+			       enum psd_coord coordtype);
+
+/**
+ * acpigen_write_cst_package() - Write a _CST package
+ *
+ * See ACPI v6.3 section 8.4.2.1: _CST (C States)
+ *
+ * @ctx: ACPI context pointer
+ * @entry: Array of entries
+ * @nentries; Number of entries
+ */
+void acpigen_write_cst_package(struct acpi_ctx *ctx,
+			       const struct acpi_cstate *entry, int nentries);
+
+/**
+ * acpigen_write_csd_package() - Write a _CSD Package
+ *
+ * See ACPI v6.3 section 8.4.2.2: _CSD (C-State Dependency)
+ *
+ * @ctx: ACPI context pointer
+ * @domain: dependency domain number to which this C state entry belongs
+ * @numprocs: number of processors belonging to the domain for the particular
+ *	C-state
+ * @coordtype: Co-ordination type
+ * @index: Index of the C-State entry in the _CST object for which the
+ *	dependency applies
+ */
+void acpigen_write_csd_package(struct acpi_ctx *ctx, uint domain, uint numprocs,
+			       enum csd_coord coordtype, uint index);
+
+/**
+ * acpigen_write_tss_package() - Write a _TSS package
+ *
+ * @ctx: ACPI context pointer
+ * @entry: Entries to write
+ * @nentries: Number of entries to write
+ */
+void acpigen_write_tss_package(struct acpi_ctx *ctx,
+			       struct acpi_tstate *entry, int nentries);
+
+/**
+ * acpigen_write_tsd_package() - Write a _TSD package
+ *
+ * See ACPI v6.3 section 8.4.5.4: _TSD (T-State Dependency)
+ *
+ * @ctx: ACPI context pointer
+ * @domain: dependency domain number to which this T state entry belongs
+ * @numprocs: Number of processors belonging to the domain for this logical
+ *	processor?s T-states
+ * @coordtype: Coordination type
+ */
+void acpigen_write_tsd_package(struct acpi_ctx *ctx, uint domain, uint numprocs,
+			       enum psd_coord coordtype);
+
 #endif
diff --git a/lib/acpi/acpigen.c b/lib/acpi/acpigen.c
index b9985075cde..e395226e3de 100644
--- a/lib/acpi/acpigen.c
+++ b/lib/acpi/acpigen.c
@@ -481,6 +481,53 @@ void acpigen_write_register_resource(struct acpi_ctx *ctx,
 	acpigen_write_resourcetemplate_footer(ctx);
 }
 
+void acpigen_write_ppc(struct acpi_ctx *ctx, uint num_pstates)
+{
+	/*
+	 * Method (_PPC, 0, NotSerialized)
+	 * {
+	 *	Return (num_pstates)
+	 * }
+	 */
+	acpigen_write_method(ctx, "_PPC", 0);
+	acpigen_emit_byte(ctx, RETURN_OP);
+	acpigen_write_byte(ctx, num_pstates);
+	acpigen_pop_len(ctx);
+}
+
+/*
+ * Generates a func with max supported P-states saved
+ * in the variable PPCM.
+ */
+void acpigen_write_ppc_nvs(struct acpi_ctx *ctx)
+{
+	/*
+	 * Method (_PPC, 0, NotSerialized)
+	 * {
+	 *	Return (PPCM)
+	 * }
+	 */
+	acpigen_write_method(ctx, "_PPC", 0);
+	acpigen_emit_byte(ctx, RETURN_OP);
+	acpigen_emit_namestring(ctx, "PPCM");
+	acpigen_pop_len(ctx);
+}
+
+void acpigen_write_tpc(struct acpi_ctx *ctx, const char *gnvs_tpc_limit)
+{
+	/*
+	 * // Sample _TPC method
+	 * Method (_TPC, 0, NotSerialized)
+	 * {
+	 *	Return (\TLVL)
+	 * }
+	 */
+	acpigen_write_method(ctx, "_TPC", 0);
+	acpigen_emit_byte(ctx, RETURN_OP);
+	acpigen_emit_namestring(ctx, gnvs_tpc_limit);
+	acpigen_pop_len(ctx);
+}
+
 void acpigen_write_prw(struct acpi_ctx *ctx, uint wake, uint level)
 {
 	/* Name (_PRW, Package () { wake, level } */
@@ -491,6 +538,126 @@ void acpigen_write_prw(struct acpi_ctx *ctx, uint wake, uint level)
 	acpigen_pop_len(ctx);
 }
 
+void acpigen_write_pss_package(struct acpi_ctx *ctx, u32 core_freq, u32 power,
+			       u32 trans_lat, u32 busm_lat, u32 control,
+			       u32 status)
+{
+	acpigen_write_package(ctx, 6);
+	acpigen_write_dword(ctx, core_freq);
+	acpigen_write_dword(ctx, power);
+	acpigen_write_dword(ctx, trans_lat);
+	acpigen_write_dword(ctx, busm_lat);
+	acpigen_write_dword(ctx, control);
+	acpigen_write_dword(ctx, status);
+	acpigen_pop_len(ctx);
+
+	log_debug("PSS: %uMHz power %u control 0x%x status 0x%x\n",
+		  core_freq, power, control, status);
+}
+
+void acpigen_write_psd_package(struct acpi_ctx *ctx, uint domain, uint numprocs,
+			       enum psd_coord coordtype)
+{
+	acpigen_write_name(ctx, "_PSD");
+	acpigen_write_package(ctx, 1);
+	acpigen_write_package(ctx, 5);
+	acpigen_write_byte(ctx, 5);	// 5 values
+	acpigen_write_byte(ctx, 0);	// revision 0
+	acpigen_write_dword(ctx, domain);
+	acpigen_write_dword(ctx, coordtype);
+	acpigen_write_dword(ctx, numprocs);
+	acpigen_pop_len(ctx);
+	acpigen_pop_len(ctx);
+}
+
+static void acpigen_write_cst_package_entry(struct acpi_ctx *ctx,
+					    const struct acpi_cstate *cstate)
+{
+	acpigen_write_package(ctx, 4);
+	acpigen_write_register_resource(ctx, &cstate->resource);
+	acpigen_write_dword(ctx, cstate->ctype);
+	acpigen_write_dword(ctx, cstate->latency);
+	acpigen_write_dword(ctx, cstate->power);
+	acpigen_pop_len(ctx);
+}
+
+void acpigen_write_cst_package(struct acpi_ctx *ctx,
+			       const struct acpi_cstate *cstate, int nentries)
+{
+	int i;
+
+	acpigen_write_name(ctx, "_CST");
+	acpigen_write_package(ctx, nentries + 1);
+	acpigen_write_dword(ctx, nentries);
+
+	for (i = 0; i < nentries; i++)
+		acpigen_write_cst_package_entry(ctx, cstate + i);
+
+	acpigen_pop_len(ctx);
+}
+
+void acpigen_write_csd_package(struct acpi_ctx *ctx, uint domain, uint numprocs,
+			       enum csd_coord coordtype, uint index)
+{
+	acpigen_write_name(ctx, "_CSD");
+	acpigen_write_package(ctx, 1);
+	acpigen_write_package(ctx, 6);
+	acpigen_write_byte(ctx, 6);	// 6 values
+	acpigen_write_byte(ctx, 0);	// revision 0
+	acpigen_write_dword(ctx, domain);
+	acpigen_write_dword(ctx, coordtype);
+	acpigen_write_dword(ctx, numprocs);
+	acpigen_write_dword(ctx, index);
+	acpigen_pop_len(ctx);
+	acpigen_pop_len(ctx);
+}
+
+void acpigen_write_tss_package(struct acpi_ctx *ctx,
+			       struct acpi_tstate *entry, int nentries)
+{
+	/*
+	 * Sample _TSS package with 100% and 50% duty cycles
+	 * Name (_TSS, Package (0x02)
+	 * {
+	 *	Package(){100, 1000, 0, 0x00, 0)
+	 *	Package(){50, 520, 0, 0x18, 0)
+	 * })
+	 */
+	struct acpi_tstate *tstate = entry;
+	int i;
+
+	acpigen_write_name(ctx, "_TSS");
+	acpigen_write_package(ctx, nentries);
+
+	for (i = 0; i < nentries; i++) {
+		acpigen_write_package(ctx, 5);
+		acpigen_write_dword(ctx, tstate->percent);
+		acpigen_write_dword(ctx, tstate->power);
+		acpigen_write_dword(ctx, tstate->latency);
+		acpigen_write_dword(ctx, tstate->control);
+		acpigen_write_dword(ctx, tstate->status);
+		acpigen_pop_len(ctx);
+		tstate++;
+	}
+
+	acpigen_pop_len(ctx);
+}
+
+void acpigen_write_tsd_package(struct acpi_ctx *ctx, u32 domain, u32 numprocs,
+			       enum psd_coord coordtype)
+{
+	acpigen_write_name(ctx, "_TSD");
+	acpigen_write_package(ctx, 1);
+	acpigen_write_package(ctx, 5);
+	acpigen_write_byte(ctx, 5);	// 5 values
+	acpigen_write_byte(ctx, 0);	// revision 0
+	acpigen_write_dword(ctx, domain);
+	acpigen_write_dword(ctx, coordtype);
+	acpigen_write_dword(ctx, numprocs);
+	acpigen_pop_len(ctx);
+	acpigen_pop_len(ctx);
+}
+
 /*
  * ToUUID(uuid)
  *
diff --git a/test/dm/acpigen.c b/test/dm/acpigen.c
index 74b7e23aab3..3ec2743af9f 100644
--- a/test/dm/acpigen.c
+++ b/test/dm/acpigen.c
@@ -1450,3 +1450,297 @@ static int dm_test_acpi_write_processor_cnot(struct unit_test_state *uts)
 	return 0;
 }
 DM_TEST(dm_test_acpi_write_processor_cnot, 0);
+
+/* Test acpigen_write_tpc */
+static int dm_test_acpi_write_tpc(struct unit_test_state *uts)
+{
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+
+	ut_assertok(alloc_context(&ctx));
+
+	ptr = acpigen_get_current(ctx);
+	acpigen_write_tpc(ctx, "\\TLVL");
+
+	ut_asserteq(METHOD_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq_strn("_TPC", (char *)ptr);
+	ptr += 4;
+	ut_asserteq(0, *ptr++);
+	ut_asserteq(RETURN_OP, *ptr++);
+	ut_asserteq_strn("\\TLVL", (char *)ptr);
+	ptr += 5;
+
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_tpc, 0);
+
+/* Test acpigen_write_pss_package(), etc. */
+static int dm_test_acpi_write_pss_psd(struct unit_test_state *uts)
+{
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+
+	ut_assertok(alloc_context(&ctx));
+
+	ptr = acpigen_get_current(ctx);
+	acpigen_write_pss_package(ctx, 1, 2, 3, 4, 5, 6);
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(6, *ptr++);
+
+	ut_asserteq(DWORD_PREFIX, *ptr++);
+	ut_asserteq(1, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(2, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(3, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(4, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(5, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(6, get_unaligned((u32 *)ptr));
+	ptr += 4;
+
+	acpigen_write_psd_package(ctx, 6, 7, HW_ALL);
+	ut_asserteq(NAME_OP, *ptr++);
+	ut_asserteq_strn("_PSD", (char *)ptr);
+	ptr += 4;
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(1, *ptr++);
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(5, *ptr++);
+
+	ut_asserteq(BYTE_PREFIX, *ptr++);
+	ut_asserteq(5, *ptr++);
+	ut_asserteq(BYTE_PREFIX, *ptr++);
+	ut_asserteq(0, *ptr++);
+
+	ut_asserteq(DWORD_PREFIX, *ptr++);
+	ut_asserteq(6, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(HW_ALL, get_unaligned((u32 *)ptr));
+	ptr += 5;
+
+	ut_asserteq(7, get_unaligned((u32 *)ptr));
+	ptr += 4;
+
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_pss_psd, 0);
+
+/* Test acpi_write_cst_package() */
+static int dm_test_acpi_write_cst(struct unit_test_state *uts)
+{
+	static struct acpi_cstate cstate_map[] = {
+		{
+			/* C1 */
+			.ctype = 1,		/* ACPI C1 */
+			.latency = 1,
+			.power = 1000,
+			.resource = {
+				.space_id = ACPI_ADDRESS_SPACE_FIXED,
+			},
+		}, {
+			.ctype = 2,		/* ACPI C2 */
+			.latency = 50,
+			.power = 10,
+			.resource = {
+				.space_id = ACPI_ADDRESS_SPACE_IO,
+				.bit_width = 8,
+				.addrl = 0x415,
+			},
+		},
+	};
+	int nentries = ARRAY_SIZE(cstate_map);
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+	int i;
+
+	ut_assertok(alloc_context(&ctx));
+
+	ptr = acpigen_get_current(ctx);
+	acpigen_write_cst_package(ctx, cstate_map, nentries);
+
+	ut_asserteq(NAME_OP, *ptr++);
+	ut_asserteq_strn("_CST", (char *)ptr);
+	ptr += 4;
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(nentries + 1, *ptr++);
+	ut_asserteq(DWORD_PREFIX, *ptr++);
+	ut_asserteq(nentries, get_unaligned((u32 *)ptr));
+	ptr += 4;
+
+	for (i = 0; i < nentries; i++) {
+		ut_asserteq(PACKAGE_OP, *ptr++);
+		ptr += 3;  /* skip length */
+		ut_asserteq(4, *ptr++);
+		ut_asserteq(BUFFER_OP, *ptr++);
+		ptr += 0x17;
+		ut_asserteq(DWORD_PREFIX, *ptr++);
+		ut_asserteq(cstate_map[i].ctype, get_unaligned((u32 *)ptr));
+		ptr += 5;
+		ut_asserteq(cstate_map[i].latency, get_unaligned((u32 *)ptr));
+		ptr += 5;
+		ut_asserteq(cstate_map[i].power, get_unaligned((u32 *)ptr));
+		ptr += 4;
+	}
+
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_cst, 0);
+
+/* Test acpi_write_cst_package() */
+static int dm_test_acpi_write_csd(struct unit_test_state *uts)
+{
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+
+	ut_assertok(alloc_context(&ctx));
+
+	ptr = acpigen_get_current(ctx);
+	acpigen_write_csd_package(ctx, 12, 34, CSD_HW_ALL, 56);
+
+	ut_asserteq(NAME_OP, *ptr++);
+	ut_asserteq_strn("_CSD", (char *)ptr);
+	ptr += 4;
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(1, *ptr++);
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(6, *ptr++);
+
+	ut_asserteq(BYTE_PREFIX, *ptr++);
+	ut_asserteq(6, *ptr++);
+	ut_asserteq(BYTE_PREFIX, *ptr++);
+	ut_asserteq(0, *ptr++);
+	ut_asserteq(DWORD_PREFIX, *ptr++);
+	ut_asserteq(12, get_unaligned((u32 *)ptr));
+	ptr += 5;
+	ut_asserteq(CSD_HW_ALL, get_unaligned((u32 *)ptr));
+	ptr += 5;
+	ut_asserteq(34, get_unaligned((u32 *)ptr));
+	ptr += 5;
+	ut_asserteq(56, get_unaligned((u32 *)ptr));
+	ptr += 4;
+
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_csd, 0);
+
+/* Test acpigen_write_tss_package() */
+static int dm_test_acpi_write_tss(struct unit_test_state *uts)
+{
+	static struct acpi_tstate tstate_list[] = {
+		{ 1, 2, 3, 4, 5, },
+		{ 6, 7, 8, 9, 10, },
+	};
+	int nentries = ARRAY_SIZE(tstate_list);
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+	int i;
+
+	ut_assertok(alloc_context(&ctx));
+
+	ptr = acpigen_get_current(ctx);
+	acpigen_write_tss_package(ctx, tstate_list, nentries);
+
+	ut_asserteq(NAME_OP, *ptr++);
+	ut_asserteq_strn("_TSS", (char *)ptr);
+	ptr += 4;
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(nentries, *ptr++);
+
+	for (i = 0; i < nentries; i++) {
+		ut_asserteq(PACKAGE_OP, *ptr++);
+		ptr += 3;  /* skip length */
+		ut_asserteq(5, *ptr++);
+		ut_asserteq(DWORD_PREFIX, *ptr++);
+		ut_asserteq(tstate_list[i].percent, get_unaligned((u32 *)ptr));
+		ptr += 5;
+		ut_asserteq(tstate_list[i].power, get_unaligned((u32 *)ptr));
+		ptr += 5;
+		ut_asserteq(tstate_list[i].latency, get_unaligned((u32 *)ptr));
+		ptr += 5;
+		ut_asserteq(tstate_list[i].control, get_unaligned((u32 *)ptr));
+		ptr += 5;
+		ut_asserteq(tstate_list[i].status, get_unaligned((u32 *)ptr));
+		ptr += 4;
+	}
+
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_tss, 0);
+
+/* Test acpigen_write_tsd_package() */
+static int dm_test_acpi_write_tsd_package(struct unit_test_state *uts)
+{
+	struct acpi_ctx *ctx;
+	u8 *ptr;
+
+	ut_assertok(alloc_context(&ctx));
+
+	ptr = acpigen_get_current(ctx);
+	acpigen_write_tsd_package(ctx, 12, 34, HW_ALL);
+
+	ut_asserteq(NAME_OP, *ptr++);
+	ut_asserteq_strn("_TSD", (char *)ptr);
+	ptr += 4;
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(1, *ptr++);
+	ut_asserteq(PACKAGE_OP, *ptr++);
+	ptr += 3;  /* skip length */
+	ut_asserteq(5, *ptr++);
+
+	ut_asserteq(BYTE_PREFIX, *ptr++);
+	ut_asserteq(5, *ptr++);
+	ut_asserteq(BYTE_PREFIX, *ptr++);
+	ut_asserteq(0, *ptr++);
+	ut_asserteq(DWORD_PREFIX, *ptr++);
+	ut_asserteq(12, get_unaligned((u32 *)ptr));
+	ptr += 5;
+	ut_asserteq(CSD_HW_ALL, get_unaligned((u32 *)ptr));
+	ptr += 5;
+	ut_asserteq(34, get_unaligned((u32 *)ptr));
+	ptr += 4;
+
+	ut_asserteq_ptr(ptr, ctx->current);
+
+	free_context(&ctx);
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_write_tsd_package, 0);
-- 
2.28.0.526.ge36021eeef-goog