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Re: [PATCH v10 06/10] ACPI ERST: build the ACPI ERST table

From: Eric DeVolder
Subject: Re: [PATCH v10 06/10] ACPI ERST: build the ACPI ERST table
Date: Mon, 13 Dec 2021 16:02:26 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.2.0 
Michael,
Thanks for reviewing! Inline responses below.
eric

On 12/12/21 16:56, Michael S. Tsirkin wrote:

On Thu, Dec 09, 2021 at 12:57:31PM -0500, Eric DeVolder 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 | 241 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 241 insertions(+)

diff --git a/hw/acpi/erst.c b/hw/acpi/erst.c
index 81f5435..753425a 100644
--- a/hw/acpi/erst.c
+++ b/hw/acpi/erst.c
@@ -711,6 +711,247 @@ static const MemoryRegionOps erst_reg_ops = {
      .endianness = DEVICE_NATIVE_ENDIAN,
  };
+ 
+/*******************************************************************/
+/*******************************************************************/
+
+/* 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
+


I would create wrappers for the specific uses that we do have. Leave the
rest alone.
You just use 4 of these right? And a bunch of parameters are
always the same. E.g. flags always 0, address always same.
If I understand correctly, I think you are suggesting making wrappers for the 4 in use (ie WRITE, WRITE_VALUE, READ, READ_VALUE). in an effort to simplify/hide the underlying call to build_serialization_instruction_entry(). OK, I'll do that. 




+/* 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,


maybe make it width in bytes, then you do not need a switch.
I can make it bytes, but the switch is still needed as the corresponding field is an encoding (ie 1,2,3,4 vs 1, 2, 4, 8). 




+    uint64_t register_address,
+    uint64_t value,
+    uint64_t mask)
+{
+    /* ACPI 4.0: Table 17-18 Serialization Instruction Entry */
+    struct AcpiGenericAddress gas;
+
+    /* 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;
+    switch (register_bit_width) {
+    case 8:
+        gas.access_width = 1;
+        break;
+    case 16:
+        gas.access_width = 2;
+        break;
+    case 32:
+        gas.access_width = 3;
+        break;
+    case 64:
+        gas.access_width = 4;
+        break;
+    default:
+        gas.access_width = 0;
+        break;


does this default actually work?
I actually have no idea. But given that this is driven by code in this file, I'll set an assert there instead; this should never happen. 




+    }
+    gas.address = register_address;
+    build_append_gas_from_struct(table_data, &gas);
+    /* Value */
+    build_append_int_noprefix(table_data, value  , 8);
+    /* Mask */
+    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;
+    pcibus_t bar0, bar1;
+    AcpiTable table = { .sig = "ERST", .rev = 1, .oem_id = oem_id,
+                        .oem_table_id = oem_table_id };
+
+    bar0 = (pcibus_t)pci_get_bar_addr(PCI_DEVICE(erst_dev), 0);
+    trace_acpi_erst_pci_bar_0(bar0);
+    bar1 = (pcibus_t)pci_get_bar_addr(PCI_DEVICE(erst_dev), 1);


why do we need the cast here?
Also assignment at declaration point will be cleaner, won't it?

Corrected; cast removed and assigned at declaration.



+    trace_acpi_erst_pci_bar_1(bar1);


bar1 seems unused ... why do we bother with it just for trace?

Corrected; bar1 not needed.




+
+#define MASK8  0x00000000000000FFUL
+#define MASK16 0x000000000000FFFFUL
+#define MASK32 0x00000000FFFFFFFFUL
+#define MASK64 0xFFFFFFFFFFFFFFFFUL



can't we just pass # of bytes?
I could, but then I'd need a switch statement to convert to one of these masks. The full mask is embedded in the generic address structure.
Perhaps in the wrapper I can use width in bytes and the switch statement can producing the encoding and the mask... 


+
+    /*
+     * 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));
+
+    /* Serialization Instruction Entries */
+    action = ACTION_BEGIN_WRITE_OPERATION;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_BEGIN_READ_OPERATION;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_BEGIN_CLEAR_OPERATION;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_END_OPERATION;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_SET_RECORD_OFFSET;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER      , 0, 32,
+        bar0 + ERST_VALUE_OFFSET , 0, MASK32);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_EXECUTE_OPERATION;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_VALUE_OFFSET , ERST_EXECUTE_OPERATION_MAGIC, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_CHECK_BUSY_STATUS;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER_VALUE , 0, 32,
+        bar0 + ERST_VALUE_OFFSET, 0x01, MASK8);
+
+    action = ACTION_GET_COMMAND_STATUS;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 32,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK8);
+
+    action = ACTION_GET_RECORD_IDENTIFIER;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 64,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK64);
+
+    action = ACTION_SET_RECORD_IDENTIFIER;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER      , 0, 64,
+        bar0 + ERST_VALUE_OFFSET , 0, MASK64);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_GET_RECORD_COUNT;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 32,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK32);
+
+    action = ACTION_BEGIN_DUMMY_WRITE_OPERATION;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+
+    action = ACTION_GET_ERROR_LOG_ADDRESS_RANGE;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 64,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK64);
+
+    action = ACTION_GET_ERROR_LOG_ADDRESS_LENGTH;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 64,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK32);
+
+    action = ACTION_GET_ERROR_LOG_ADDRESS_RANGE_ATTRIBUTES;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 32,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK32);
+
+    action = ACTION_GET_EXECUTE_OPERATION_TIMINGS;
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_WRITE_REGISTER_VALUE, 0, 32,
+        bar0 + ERST_ACTION_OFFSET, action, MASK8);
+    build_serialization_instruction_entry(table_instruction_data,
+        action, INST_READ_REGISTER       , 0, 64,
+        bar0 + ERST_VALUE_OFFSET, 0, MASK64);
+
+    /* 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
+     */


assert that it's a multiple of 32 maybe

done!




+    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 int erst_post_load(void *opaque, int version_id)
--
1.8.3.1
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