pvr_fw_util.c

 1// SPDX-License-Identifier: GPL-2.0-only OR MIT
 2/* Copyright (c) 2024 Imagination Technologies Ltd. */
 3
 4#include "pvr_device.h"
 5#include "pvr_fw.h"
 6
 7#include <drm/drm_device.h>
 8#include <drm/drm_print.h>
 9
10#include <linux/elf.h>
11#include <linux/string.h>
12#include <linux/types.h>
13
14/**
15 * pvr_fw_process_elf_command_stream() - Process ELF firmware image and populate
16 *                                       firmware sections
17 * @pvr_dev: Device pointer.
18 * @fw: Pointer to firmware image.
19 * @fw_code_ptr: Pointer to FW code section.
20 * @fw_data_ptr: Pointer to FW data section.
21 * @fw_core_code_ptr: Pointer to FW coremem code section.
22 * @fw_core_data_ptr: Pointer to FW coremem data section.
23 *
24 * Returns :
25 *  * 0 on success, or
26 *  * -EINVAL on any error in ELF command stream.
27 */
28int
29pvr_fw_process_elf_command_stream(struct pvr_device *pvr_dev, const u8 *fw,
30				  u8 *fw_code_ptr, u8 *fw_data_ptr,
31				  u8 *fw_core_code_ptr, u8 *fw_core_data_ptr)
32{
33	struct elf32_hdr *header = (struct elf32_hdr *)fw;
34	struct elf32_phdr *program_header = (struct elf32_phdr *)(fw + header->e_phoff);
35	struct drm_device *drm_dev = from_pvr_device(pvr_dev);
36	int err;
37
38	for (u32 entry = 0; entry < header->e_phnum; entry++, program_header++) {
39		void *write_addr;
40
41		/* Only consider loadable entries in the ELF segment table */
42		if (program_header->p_type != PT_LOAD)
43			continue;
44
45		err = pvr_fw_find_mmu_segment(pvr_dev, program_header->p_vaddr,
46					      program_header->p_memsz, fw_code_ptr, fw_data_ptr,
47					      fw_core_code_ptr, fw_core_data_ptr, &write_addr);
48		if (err) {
49			drm_err(drm_dev,
50				"Addr 0x%x (size: %d) not found in any firmware segment",
51				program_header->p_vaddr, program_header->p_memsz);
52			return err;
53		}
54
55		/* Write to FW allocation only if available */
56		if (write_addr) {
57			memcpy(write_addr, fw + program_header->p_offset,
58			       program_header->p_filesz);
59
60			memset((u8 *)write_addr + program_header->p_filesz, 0,
61			       program_header->p_memsz - program_header->p_filesz);
62		}
63	}
64
65	return 0;
66}