[igt-dev] [PATCH i-g-t 1/2] tools/l3_parity: Unnest exit handlers

[Petri Latvala]

On Sat, Sep 07, 2019 at 07:12:56PM +0100, Chris Wilson wrote:
> The curse of using libigt where it is not wanted; in this case calling
> drop-caches while we hold the forcewake is a recipe for a long wait.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

For the series:
Reviewed-by: Petri Latvala <petri.latvala at intel.com>


> ---
>  tools/intel_l3_parity.c | 50 ++++++++++++++++++++++++-----------------
>  1 file changed, 29 insertions(+), 21 deletions(-)
> 
> diff --git a/tools/intel_l3_parity.c b/tools/intel_l3_parity.c
> index 06a185c91..340f94b1a 100644
> --- a/tools/intel_l3_parity.c
> +++ b/tools/intel_l3_parity.c
> @@ -180,6 +180,7 @@ int main(int argc, char *argv[])
>  	const char *path[REAL_MAX_SLICES] = {"l3_parity", "l3_parity_slice_1"};
>  	int row = 0, bank = 0, sbank = 0;
>  	int fd[REAL_MAX_SLICES] = {0}, ret, i;
> +	int exitcode = EXIT_FAILURE;
>  	int action = '0';
>  	int daemonize = 0;
>  	int device, dir;
> @@ -198,13 +199,13 @@ int main(int argc, char *argv[])
>  		fd[i] = openat(dir, path[i], O_RDWR);
>  		if (fd[i] < 0) {
>  			if (i == 0) /* at least one slice must be supported */
> -				exit(77);
> +				goto skip;
>  			continue;
>  		}
>  
>  		if (read(fd[i], l3logs[i], NUM_REGS * sizeof(uint32_t)) < 0) {
>  			perror(path[i]);
> -			exit(77);
> +			goto skip;
>  		}
>  		assert(lseek(fd[i], 0, SEEK_SET) == 0);
>  	}
> @@ -252,45 +253,45 @@ int main(int argc, char *argv[])
>  			case '?':
>  			case 'h':
>  				usage(argv[0]);
> -				exit(EXIT_SUCCESS);
> +				goto success;
>  			case 'H':
>  				printf("Number of slices: %d\n", MAX_SLICES);
>  				printf("Number of banks: %d\n", num_banks());
>  				printf("Subbanks per bank: %d\n", NUM_SUBBANKS);
>  				printf("Max L3 size: %dK\n", L3_SIZE >> 10);
>  				printf("Has error injection: %s\n", IS_HASWELL(devid) ? "yes" : "no");
> -				exit(EXIT_SUCCESS);
> +				goto success;
>  			case 'r':
>  				row = atoi(optarg);
>  				if (row >= MAX_ROW)
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				break;
>  			case 'b':
>  				bank = atoi(optarg);
>  				if (bank >= num_banks() || bank >= MAX_BANKS_PER_SLICE)
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				break;
>  			case 's':
>  				sbank = atoi(optarg);
>  				if (sbank >= NUM_SUBBANKS)
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				break;
>  			case 'w':
>  				which_slice = atoi(optarg);
>  				if (which_slice >= MAX_SLICES)
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				break;
>  			case 'i':
>  			case 'u':
>  				if (!IS_HASWELL(devid)) {
>  					fprintf(stderr, "Error injection supported on HSW+ only\n");
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				}
>  			case 'd':
>  				if (optarg) {
>  					ret = sscanf(optarg, "%d,%d,%d", &row, &bank, &sbank);
>  					if (ret != 3)
> -						exit(EXIT_FAILURE);
> +						goto failure;
>  				}
>  			case 'a':
>  			case 'l':
> @@ -298,24 +299,24 @@ int main(int argc, char *argv[])
>  			case 'L':
>  				if (action != '0') {
>  					fprintf(stderr, "Only one action may be specified\n");
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				}
>  				action = c;
>  				break;
>  			default:
> -				abort();
> +				goto failure;
>  		}
>  	}
>  
>  	if (action == 'i') {
>  		if (((dft >> 1) & 1) != which_slice) {
>  			fprintf(stderr, "DFT register already has slice %d enabled, and we don't support multiple slices. Try modifying -w; but sometimes the register sticks in the wrong way\n", (dft >> 1) & 1);
> -			exit(EXIT_FAILURE);
> +			goto failure;
>  		}
>  
>  		if (which_slice == -1) {
>  			fprintf(stderr, "Cannot inject errors to multiple slices (modify -w)\n");
> -			exit(EXIT_FAILURE);
> +			goto failure;
>  		}
>  		if (dft & 1 && ((dft >> 1) && 1) == which_slice)
>  			printf("warning: overwriting existing injections. This is very dangerous.\n");
> @@ -332,7 +333,7 @@ int main(int argc, char *argv[])
>  		memset(&par, 0, sizeof(par));
>  		assert(l3_uevent_setup(&par) == 0);
>  		assert(l3_listen(&par, daemonize == 1, &loc) == 0);
> -		exit(EXIT_SUCCESS);
> +		goto success;
>  	}
>  
>  	if (action == 'l')
> @@ -359,7 +360,7 @@ int main(int argc, char *argv[])
>  			case 'i':
>  				if (bank == 3) {
>  					fprintf(stderr, "The hardware does not support error inject on bank 3.\n");
> -					exit(EXIT_FAILURE);
> +					goto failure;
>  				}
>  				dft |= row << 7;
>  				dft |= sbank << 4;
> @@ -375,13 +376,12 @@ int main(int argc, char *argv[])
>  			case 'L':
>  				break;
>  			default:
> -				abort();
> +				goto failure;
>  		}
>  	}
>  
> -	intel_register_access_fini(&mmio_data);
>  	if (action == 'l')
> -		exit(EXIT_SUCCESS);
> +		goto success;
>  
>  	for_each_slice(i) {
>  		if (fd[i] < 0)
> @@ -390,11 +390,19 @@ int main(int argc, char *argv[])
>  		ret = write(fd[i], l3logs[i], NUM_REGS * sizeof(uint32_t));
>  		if (ret == -1) {
>  			perror("Writing sysfs");
> -			exit(EXIT_FAILURE);
> +			goto failure;
>  		}
>  		close(fd[i]);
>  	}
>  
>  
> -	exit(EXIT_SUCCESS);
> +success:
> +	exitcode = EXIT_SUCCESS;
> +failure:
> +	intel_register_access_fini(&mmio_data);
> +	return exitcode;
> +
> +skip:
> +	exitcode = 77;
> +	goto failure;
>  }
> -- 
> 2.23.0
> 
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