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> igt_sysfs_set_u32(gtfd, "slpc_ignore_eff_freq", val); > } > + > +/** > + * igt_pm_check_hibernation_support: > + * > + * Return: True if kernel is configured with resume point for hibernate. > + */ > +bool igt_pm_check_hibernation_support(void) > +{ > + int fd; > + char buffer[2048]; > + ssize_t bytes_read; > + FILE *cmdline; > + > + /* Check if hibernation is supported in /sys/power/state */ > + fd = open("/sys/power/state", O_RDONLY); > + > + if (fd <= 0) { > + igt_debug("Failed to open /sys/power/state\n"); > + return false; > + } > + > + bytes_read = read(fd, buffer, sizeof(buffer) - 1); > + close(fd); > + > + if (bytes_read <= 0) { > + igt_debug("Failed to read /sys/power/state"); > + return false; > + } > + > + buffer[bytes_read] = '\0'; > + if (strstr(buffer, "disk") == NULL) { > + igt_debug("Hibernation (suspend to disk) is not supported on this system.\n"); > + return false; > + } > + > + /* Check if resume is configured in kernel command line */ > + cmdline = fopen("/proc/cmdline", "r"); > + > + if (!cmdline) { > + igt_debug("Failed to open /proc/cmdline"); > + return false; > + } > + > + fread(buffer, 1, sizeof(buffer) - 1, cmdline); > + fclose(cmdline); > + > + if (strstr(buffer, "resume=") == NULL) { > + igt_debug("Kernel does not have 'resume' parameter configured for hibernation.\n"); > + return false; > + } > + > + return true; > +} > + > +/** > + * igt_pm_ensure_grub_boots_same_kernel: > + * > + * Return: True if kernel was found and set for next reboot. > + */ > +bool igt_pm_ensure_grub_boots_same_kernel(void) > +{ > + char cmdline[1024]; > + char current_kernel[256]; > + char last_menuentry[512] = ""; > + char grub_entry[512]; > + char command[1024]; > + FILE *cmdline_file, *grub_cfg; > + char line[1024]; > + bool kernel_found = false; > + char *kernel_arg; > + char *kernel_end; > + > + /* Read /proc/cmdline to get the current kernel image */ > + cmdline_file = fopen("/proc/cmdline", "r"); > + if (!cmdline_file) { > + igt_debug("Failed to open /proc/cmdline"); > + return false; > + } > + > + if (!fgets(cmdline, sizeof(cmdline), cmdline_file)) { > + fclose(cmdline_file); > + igt_debug("Failed to read /proc/cmdline"); > + return false; > + } > + fclose(cmdline_file); > + > + /* Parse the kernel image from cmdline */ > + kernel_arg = strstr(cmdline, "BOOT_IMAGE="); > + if (!kernel_arg) { > + igt_debug("BOOT_IMAGE= not found in /proc/cmdline\n"); > + return false; > + } > + > + kernel_arg += strlen("BOOT_IMAGE="); > + kernel_end = strchr(kernel_arg, ' '); > + > + if (!kernel_end) > + kernel_end = kernel_arg + strlen(kernel_arg); > + > + snprintf(current_kernel, sizeof(current_kernel), "%.*s", > + (int)(kernel_end - kernel_arg), kernel_arg); > + igt_debug("Current kernel image: %s\n", current_kernel); > + > + /* Open GRUB config file to find matching entry */ > + grub_cfg = fopen("/boot/grub/grub.cfg", "r"); The problem is that this depends on distro and with or without EFI... in my Fedora here: $ cat /boot/grub/grub.cfg cat: /boot/grub/grub.cfg: No such file or directory > + if (!grub_cfg) { > + igt_debug("Failed to open GRUB configuration file"); > + return false; > + } > + > + while (fgets(line, sizeof(line), grub_cfg)) { > + /* Check if the line contains a menuentry */ > + if (strstr(line, "menuentry")) { Also I believe this can change from distro to distro... It should be better to have a generic way using other tools that could give us the default or next boot... > + /* Store the menuentry line */ > + char *start = strchr(line, '\''); > + char *end = start ? strchr(start + 1, '\'') : NULL; > + > + if (start && end) { > + snprintf(last_menuentry, > + sizeof(last_menuentry), > + "%.*s", (int)(end - start - 1), > + start + 1); > + } > + } > + > + /* Check if the current line contains the kernel */ > + if (strstr(line, current_kernel)) { > + /* Use the last seen menuentry as the match */ > + snprintf(grub_entry, sizeof(grub_entry), "%s", > + last_menuentry); > + kernel_found = true; > + break; > + } > + } > + > + fclose(grub_cfg); > + > + if (!kernel_found) { > + igt_debug("Failed to find matching GRUB entry for kernel: %s\n", > + current_kernel); > + return false; > + } > + > + /* Set the GRUB boot target using grub-reboot */ > + snprintf(command, sizeof(command), "grub-reboot \"%s\"", grub_entry); > + if (system(command) != 0) { > + igt_debug("Failed to set GRUB boot target to: %s\n", > + grub_entry); > + return false; > + } > + > + igt_debug("Set GRUB to boot kernel: %s (GRUB entry: %s)\n", > + current_kernel, grub_entry); > + return true; > +} > diff --git a/lib/igt_pm.h b/lib/igt_pm.h > index 6b428f53e..7cc774e85 100644 > --- a/lib/igt_pm.h > +++ b/lib/igt_pm.h > @@ -97,5 +97,7 @@ uint64_t igt_pm_get_runtime_suspended_time(struct pci_device *pci_dev); > uint64_t igt_pm_get_runtime_active_time(struct pci_device *pci_dev); > int igt_pm_get_runtime_usage(struct pci_device *pci_dev); > void igt_pm_ignore_slpc_efficient_freq(int i915, int gtfd, bool val); > +bool igt_pm_check_hibernation_support(void); > +bool igt_pm_ensure_grub_boots_same_kernel(void); > > #endif /* IGT_PM_H */ > -- > 2.45.2 >