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Re: [PATCH v11 06/10] ACPI ERST: build the ACPI ERST table

From: Eric DeVolder
Subject: Re: [PATCH v11 06/10] ACPI ERST: build the ACPI ERST table
Date: Wed, 15 Dec 2021 11:57:21 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 
Hi Ani,
Thanks for such quick feedback! One inline response below.
eric

On 12/15/21 10:33, Ani Sinha wrote:

On Wed, Dec 15, 2021 at 9:08 PM Eric DeVolder <eric.devolder@oracle.com> wrote:


This builds the ACPI ERST table to inform OSPM how to communicate
with the acpi-erst device.

Signed-off-by: Eric DeVolder <eric.devolder@oracle.com>
---
  hw/acpi/erst.c | 188 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 188 insertions(+)

diff --git a/hw/acpi/erst.c b/hw/acpi/erst.c
index bb6cad4..05177b3 100644
--- a/hw/acpi/erst.c
+++ b/hw/acpi/erst.c
@@ -59,6 +59,27 @@
  #define STATUS_RECORD_STORE_EMPTY     0x04
  #define STATUS_RECORD_NOT_FOUND       0x05

+/* ACPI 4.0: Table 17-19 Serialization Instructions */
+#define INST_READ_REGISTER                 0x00
+#define INST_READ_REGISTER_VALUE           0x01
+#define INST_WRITE_REGISTER                0x02
+#define INST_WRITE_REGISTER_VALUE          0x03
+#define INST_NOOP                          0x04
+#define INST_LOAD_VAR1                     0x05
+#define INST_LOAD_VAR2                     0x06
+#define INST_STORE_VAR1                    0x07
+#define INST_ADD                           0x08
+#define INST_SUBTRACT                      0x09
+#define INST_ADD_VALUE                     0x0A
+#define INST_SUBTRACT_VALUE                0x0B
+#define INST_STALL                         0x0C
+#define INST_STALL_WHILE_TRUE              0x0D
+#define INST_SKIP_NEXT_INSTRUCTION_IF_TRUE 0x0E
+#define INST_GOTO                          0x0F
+#define INST_SET_SRC_ADDRESS_BASE          0x10
+#define INST_SET_DST_ADDRESS_BASE          0x11
+#define INST_MOVE_DATA                     0x12
+
  /* UEFI 2.1: Appendix N Common Platform Error Record */
  #define UEFI_CPER_RECORD_MIN_SIZE 128U
  #define UEFI_CPER_RECORD_LENGTH_OFFSET 20U
@@ -172,6 +193,173 @@ typedef struct {

  /*******************************************************************/
  /*******************************************************************/
+
+/* ACPI 4.0: 17.4.1.2 Serialization Instruction Entries */
+static void build_serialization_instruction_entry(GArray *table_data,
+    uint8_t serialization_action,
+    uint8_t instruction,
+    uint8_t flags,
+    uint8_t register_bit_width,
+    uint64_t register_address,
+    uint64_t value)
+{
+    /* ACPI 4.0: Table 17-18 Serialization Instruction Entry */
+    struct AcpiGenericAddress gas;
+    uint64_t mask;
+
+    /* Serialization Action */
+    build_append_int_noprefix(table_data, serialization_action, 1);
+    /* Instruction */
+    build_append_int_noprefix(table_data, instruction         , 1);
+    /* Flags */
+    build_append_int_noprefix(table_data, flags               , 1);
+    /* Reserved */
+    build_append_int_noprefix(table_data, 0                   , 1);
+    /* Register Region */
+    gas.space_id = AML_SYSTEM_MEMORY;
+    gas.bit_width = register_bit_width;
+    gas.bit_offset = 0;
+    gas.access_width = ctz32(register_bit_width) - 2;
+    gas.address = register_address;
+    build_append_gas_from_struct(table_data, &gas);
+    /* Value */
+    build_append_int_noprefix(table_data, value  , 8);
+    /* Mask */
+    mask = (1ULL << (register_bit_width - 1) << 1) - 1;
+    build_append_int_noprefix(table_data, mask  , 8);
+}
+
+/* ACPI 4.0: 17.4.1 Serialization Action Table */
+void build_erst(GArray *table_data, BIOSLinker *linker, Object *erst_dev,
+    const char *oem_id, const char *oem_table_id)
+{
+    GArray *table_instruction_data;
+    unsigned action;


This variable can be eliminated (see below).


+    pcibus_t bar0 = pci_get_bar_addr(PCI_DEVICE(erst_dev), 0);
+    AcpiTable table = { .sig = "ERST", .rev = 1, .oem_id = oem_id,
+                        .oem_table_id = oem_table_id };
+
+    trace_acpi_erst_pci_bar_0(bar0);
+
+    /*
+     * Serialization Action Table
+     * The serialization action table must be generated first
+     * so that its size can be known in order to populate the
+     * Instruction Entry Count field.
+     */
+    table_instruction_data = g_array_new(FALSE, FALSE, sizeof(char));
+
+    /*
+     * Macros for use with construction of the action instructions
+     */
+#define build_read_register(action, width_in_bits, reg) \
+    build_serialization_instruction_entry(table_instruction_data, \
+        action, INST_READ_REGISTER, 0, width_in_bits, \
+        bar0 + reg, 0)
+
+#define build_read_register_value(action, width_in_bits, reg, value) \
+    build_serialization_instruction_entry(table_instruction_data, \
+        action, INST_READ_REGISTER_VALUE, 0, width_in_bits, \
+        bar0 + reg, value)
+
+#define build_write_register(action, width_in_bits, reg, value) \
+    build_serialization_instruction_entry(table_instruction_data, \
+        action, INST_WRITE_REGISTER, 0, width_in_bits, \
+        bar0 + reg, value)
+
+#define build_write_register_value(action, width_in_bits, reg, value) \
+    build_serialization_instruction_entry(table_instruction_data, \
+        action, INST_WRITE_REGISTER_VALUE, 0, width_in_bits, \
+        bar0 + reg, value)
+
+    /* Serialization Instruction Entries */
+    action = ACTION_BEGIN_WRITE_OPERATION;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_BEGIN_READ_OPERATION;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_BEGIN_CLEAR_OPERATION;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_END_OPERATION;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_SET_RECORD_OFFSET;
+    build_write_register(action, 32, ERST_VALUE_OFFSET, 0);
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_EXECUTE_OPERATION;
+    build_write_register_value(action, 32, ERST_VALUE_OFFSET,
+        ERST_EXECUTE_OPERATION_MAGIC);
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);





+
+    action = ACTION_CHECK_BUSY_STATUS;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register_value(action, 32, ERST_VALUE_OFFSET, 0x01);
+
+    action = ACTION_GET_COMMAND_STATUS;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 32, ERST_VALUE_OFFSET);
+
+    action = ACTION_GET_RECORD_IDENTIFIER;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 64, ERST_VALUE_OFFSET);
+
+    action = ACTION_SET_RECORD_IDENTIFIER;
+    build_write_register(action, 64, ERST_VALUE_OFFSET, 0);
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_GET_RECORD_COUNT;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 32, ERST_VALUE_OFFSET);
+
+    action = ACTION_BEGIN_DUMMY_WRITE_OPERATION;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+
+    action = ACTION_GET_ERROR_LOG_ADDRESS_RANGE;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 64, ERST_VALUE_OFFSET);
+
+    action = ACTION_GET_ERROR_LOG_ADDRESS_LENGTH;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 64, ERST_VALUE_OFFSET);
+
+    action = ACTION_GET_ERROR_LOG_ADDRESS_RANGE_ATTRIBUTES;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 32, ERST_VALUE_OFFSET);
+
+    action = ACTION_GET_EXECUTE_OPERATION_TIMINGS;
+    build_write_register_value(action, 32, ERST_ACTION_OFFSET, action);
+    build_read_register(action, 64, ERST_VALUE_OFFSET);


if I am reading this right, build_write_register_value() is called
with the same parameters, except that action is changing. We can
optimize repetative calls with the same parameters.

build_read_register can be split into build_read_register_32() and
build_read_register_64().
So we can have :
build_write_register_value(ACTION_GET_EXECUTE_OPERATION_TIMINGS);
build_read_register_64(ACTION_GET_EXECUTE_OPERATION_TIMINGS);



If I understand correctly, you are essentially asking for appropriate accessor 
functions.
I did an inventory and the following would be the list of unique accessors 
needed:

To ACTION register:
 write_value_32

To VALUE register:
 write_value_32
 write_32
 write_64
 read_value_32
 read_32
 read_64

So that is 7 accessors, which must spell out the access type and register name 
in the macro.
With respect to the comment on eliminating the action variable. Given the current code I did miss an optimization to avoid passing 'action' as the first parameter to the macros; I should have just used it directly within the macro. Plus the 'action' assignment acts as documentation to inform you as to which action is being constructed. But in other places, 'action' is being used as a true parameter to the macros as the value to write. 

If you think that going to more accessors is simpler/more clear, then I'll do 
so.

Thanks!
eric





+
+    /* Serialization Header */
+    acpi_table_begin(&table, table_data);
+
+    /* Serialization Header Size */
+    build_append_int_noprefix(table_data, 48, 4);
+
+    /* Reserved */
+    build_append_int_noprefix(table_data,  0, 4);
+
+    /*
+     * Instruction Entry Count
+     * Each instruction entry is 32 bytes
+     */
+    g_assert((table_instruction_data->len) % 32 == 0);
+    build_append_int_noprefix(table_data,
+        (table_instruction_data->len / 32), 4);
+
+    /* Serialization Instruction Entries */
+    g_array_append_vals(table_data, table_instruction_data->data,
+        table_instruction_data->len);
+    g_array_free(table_instruction_data, TRUE);
+
+    acpi_table_end(linker, &table);
+}
+
+/*******************************************************************/
+/*******************************************************************/
  static uint8_t *get_nvram_ptr_by_index(ERSTDeviceState *s, unsigned index)
  {
      uint8_t *rc = NULL;
--
1.8.3.1
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