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authorTom Stellard <thomas.stellard@amd.com>2014-09-29 09:36:42 -0700
committerTom Stellard <thomas.stellard@amd.com>2014-10-31 15:24:00 -0400
commite91735a641b71bc2bccabd0c779a626fa412b314 (patch)
treeba3fb7401fd8922cbc5f5ee1739b437f7b6dc154 /src/gallium/drivers/radeon
parentf058c6bbd1674bbbe1e1ef5f6f14b95307ec6312 (diff)
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.
Diffstat (limited to 'src/gallium/drivers/radeon')
-rw-r--r--src/gallium/drivers/radeon/r600_pipe_common.h8
-rw-r--r--src/gallium/drivers/radeon/radeon_elf_util.c68
-rw-r--r--src/gallium/drivers/radeon/radeon_elf_util.h10
3 files changed, 86 insertions, 0 deletions
diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h b/src/gallium/drivers/radeon/r600_pipe_common.h
index dfd8fffa59f..a699f45f421 100644
--- a/src/gallium/drivers/radeon/r600_pipe_common.h
+++ b/src/gallium/drivers/radeon/r600_pipe_common.h
@@ -120,11 +120,19 @@ struct radeon_shader_binary {
unsigned char *config;
unsigned config_size;
+ /** The number of bytes of config information for each global symbol.
+ */
+ unsigned config_size_per_symbol;
+
/** Constant data accessed by the shader. This will be uploaded
* into a constant buffer. */
unsigned char *rodata;
unsigned rodata_size;
+ /** List of symbol offsets for the shader */
+ uint64_t *global_symbol_offsets;
+ unsigned global_symbol_count;
+
/** Set to 1 if the disassembly for this binary has been dumped to
* stderr. */
int disassembled;
diff --git a/src/gallium/drivers/radeon/radeon_elf_util.c b/src/gallium/drivers/radeon/radeon_elf_util.c
index 7c5f93ef67a..ec39a890950 100644
--- a/src/gallium/drivers/radeon/radeon_elf_util.c
+++ b/src/gallium/drivers/radeon/radeon_elf_util.c
@@ -33,6 +33,48 @@
#include <libelf.h>
#include <stdio.h>
+static void parse_symbol_table(Elf_Data *symbol_table_data,
+ const GElf_Shdr *symbol_table_header,
+ struct radeon_shader_binary *binary)
+{
+ GElf_Sym symbol;
+ unsigned i = 0;
+ unsigned symbol_count =
+ symbol_table_header->sh_size / symbol_table_header->sh_entsize;
+
+ /* We are over allocating this list, because symbol_count gives the
+ * total number of symbols, and we will only be filling the list
+ * with offsets of global symbols. The memory savings from
+ * allocating the correct size of this list will be small, and
+ * I don't think it is worth the cost of pre-computing the number
+ * of global symbols.
+ */
+ binary->global_symbol_offsets = CALLOC(symbol_count, sizeof(uint64_t));
+
+ while (gelf_getsym(symbol_table_data, i++, &symbol)) {
+ unsigned i;
+ if (GELF_ST_BIND(symbol.st_info) != STB_GLOBAL) {
+ continue;
+ }
+
+ binary->global_symbol_offsets[binary->global_symbol_count] =
+ symbol.st_value;
+
+ /* Sort the list using bubble sort. This list will usually
+ * be small. */
+ for (i = binary->global_symbol_count; i > 0; --i) {
+ uint64_t lhs = binary->global_symbol_offsets[i - 1];
+ uint64_t rhs = binary->global_symbol_offsets[i];
+ if (lhs < rhs) {
+ break;
+ }
+ binary->global_symbol_offsets[i] = lhs;
+ binary->global_symbol_offsets[i - 1] = rhs;
+ }
+ ++binary->global_symbol_count;
+ }
+}
+
void radeon_elf_read(const char *elf_data, unsigned elf_size,
struct radeon_shader_binary *binary,
unsigned debug)
@@ -85,6 +127,9 @@ void radeon_elf_read(const char *elf_data, unsigned elf_size,
binary->rodata_size = section_data->d_size;
binary->rodata = MALLOC(binary->rodata_size * sizeof(unsigned char));
memcpy(binary->rodata, section_data->d_buf, binary->rodata_size);
+ } else if (!strncmp(name, ".symtab", 7)) {
+ section_data = elf_getdata(section, section_data);
+ parse_symbol_table(section_data, &section_header, binary);
}
}
@@ -92,4 +137,27 @@ void radeon_elf_read(const char *elf_data, unsigned elf_size,
elf_end(elf);
}
FREE(elf_buffer);
+
+ /* Cache the config size per symbol */
+ if (binary->global_symbol_count) {
+ binary->config_size_per_symbol =
+ binary->config_size / binary->global_symbol_count;
+ } else {
+ binary->global_symbol_count = 1;
+ binary->config_size_per_symbol = binary->config_size;
+ }
+}
+
+const unsigned char *radeon_shader_binary_config_start(
+ const struct radeon_shader_binary *binary,
+ uint64_t symbol_offset)
+{
+ unsigned i;
+ for (i = 0; i < binary->global_symbol_count; ++i) {
+ if (binary->global_symbol_offsets[i] == symbol_offset) {
+ unsigned offset = i * binary->config_size_per_symbol;
+ return binary->config + offset;
+ }
+ }
+ return binary->config;
}
diff --git a/src/gallium/drivers/radeon/radeon_elf_util.h b/src/gallium/drivers/radeon/radeon_elf_util.h
index 60dae42e224..8095e2f19e7 100644
--- a/src/gallium/drivers/radeon/radeon_elf_util.h
+++ b/src/gallium/drivers/radeon/radeon_elf_util.h
@@ -27,6 +27,8 @@
#ifndef RADEON_ELF_UTIL_H
#define RADEON_ELF_UTIL_H
+#include <stdint.h>
+
struct radeon_shader_binary;
/*
@@ -36,4 +38,12 @@ struct radeon_shader_binary;
void radeon_elf_read(const char *elf_data, unsigned elf_size,
struct radeon_shader_binary *binary, unsigned debug);
+/**
+ * @returns A pointer to the start of the configuration information for
+ * the function starting at \p symbol_offset of the binary.
+ */
+const unsigned char *radeon_shader_binary_config_start(
+ const struct radeon_shader_binary *binary,
+ uint64_t symbol_offset);
+
#endif /* RADEON_ELF_UTIL_H */