gallium/radeon: Add query for symbol specific config information
This adds a query which allows drivers to access the config information of a specific function within the LLVM generated ELF binary. This makes it possible for the driver to handle ELF binaries with multiple kernels / global functions.
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@ -120,11 +120,19 @@ struct radeon_shader_binary {
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unsigned char *config;
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unsigned config_size;
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/** The number of bytes of config information for each global symbol.
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*/
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unsigned config_size_per_symbol;
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/** Constant data accessed by the shader. This will be uploaded
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* into a constant buffer. */
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unsigned char *rodata;
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unsigned rodata_size;
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/** List of symbol offsets for the shader */
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uint64_t *global_symbol_offsets;
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unsigned global_symbol_count;
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/** Set to 1 if the disassembly for this binary has been dumped to
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* stderr. */
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int disassembled;
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@ -33,6 +33,48 @@
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#include <libelf.h>
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#include <stdio.h>
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static void parse_symbol_table(Elf_Data *symbol_table_data,
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const GElf_Shdr *symbol_table_header,
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struct radeon_shader_binary *binary)
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{
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GElf_Sym symbol;
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unsigned i = 0;
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unsigned symbol_count =
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symbol_table_header->sh_size / symbol_table_header->sh_entsize;
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/* We are over allocating this list, because symbol_count gives the
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* total number of symbols, and we will only be filling the list
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* with offsets of global symbols. The memory savings from
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* allocating the correct size of this list will be small, and
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* I don't think it is worth the cost of pre-computing the number
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* of global symbols.
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*/
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binary->global_symbol_offsets = CALLOC(symbol_count, sizeof(uint64_t));
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while (gelf_getsym(symbol_table_data, i++, &symbol)) {
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unsigned i;
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if (GELF_ST_BIND(symbol.st_info) != STB_GLOBAL) {
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continue;
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}
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binary->global_symbol_offsets[binary->global_symbol_count] =
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symbol.st_value;
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/* Sort the list using bubble sort. This list will usually
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* be small. */
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for (i = binary->global_symbol_count; i > 0; --i) {
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uint64_t lhs = binary->global_symbol_offsets[i - 1];
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uint64_t rhs = binary->global_symbol_offsets[i];
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if (lhs < rhs) {
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break;
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}
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binary->global_symbol_offsets[i] = lhs;
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binary->global_symbol_offsets[i - 1] = rhs;
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}
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++binary->global_symbol_count;
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}
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}
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void radeon_elf_read(const char *elf_data, unsigned elf_size,
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struct radeon_shader_binary *binary,
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unsigned debug)
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@ -85,6 +127,9 @@ void radeon_elf_read(const char *elf_data, unsigned elf_size,
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binary->rodata_size = section_data->d_size;
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binary->rodata = MALLOC(binary->rodata_size * sizeof(unsigned char));
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memcpy(binary->rodata, section_data->d_buf, binary->rodata_size);
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} else if (!strncmp(name, ".symtab", 7)) {
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section_data = elf_getdata(section, section_data);
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parse_symbol_table(section_data, §ion_header, binary);
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}
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}
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@ -92,4 +137,27 @@ void radeon_elf_read(const char *elf_data, unsigned elf_size,
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elf_end(elf);
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}
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FREE(elf_buffer);
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/* Cache the config size per symbol */
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if (binary->global_symbol_count) {
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binary->config_size_per_symbol =
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binary->config_size / binary->global_symbol_count;
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} else {
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binary->global_symbol_count = 1;
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binary->config_size_per_symbol = binary->config_size;
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}
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}
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const unsigned char *radeon_shader_binary_config_start(
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const struct radeon_shader_binary *binary,
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uint64_t symbol_offset)
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{
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unsigned i;
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for (i = 0; i < binary->global_symbol_count; ++i) {
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if (binary->global_symbol_offsets[i] == symbol_offset) {
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unsigned offset = i * binary->config_size_per_symbol;
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return binary->config + offset;
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}
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}
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return binary->config;
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}
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@ -27,6 +27,8 @@
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#ifndef RADEON_ELF_UTIL_H
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#define RADEON_ELF_UTIL_H
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#include <stdint.h>
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struct radeon_shader_binary;
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/*
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@ -36,4 +38,12 @@ struct radeon_shader_binary;
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void radeon_elf_read(const char *elf_data, unsigned elf_size,
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struct radeon_shader_binary *binary, unsigned debug);
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/**
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* @returns A pointer to the start of the configuration information for
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* the function starting at \p symbol_offset of the binary.
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*/
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const unsigned char *radeon_shader_binary_config_start(
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const struct radeon_shader_binary *binary,
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uint64_t symbol_offset);
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#endif /* RADEON_ELF_UTIL_H */
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