From c6c27e3d84648e6188fba314ae21a005e60bdcd4 Mon Sep 17 00:00:00 2001 From: Haren Myneni Date: Tue, 22 Jun 2021 22:17:46 -0700 Subject: [PATCH] selftests/powerpc: Use req_max_processed_len from sysfs NX capabilities On PowerVM, the hypervisor defines the maximum buffer length for each NX request and the kernel exported this value via sysfs. This patch reads this value if the sysfs entry is available and is used to limit the request length. Signed-off-by: Haren Myneni Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/ed908341b1eb7ca0183c028a4ed4a0cf48bfe0f6.camel@linux.ibm.com --- tools/testing/selftests/powerpc/nx-gzip/Makefile | 4 ++-- tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c | 17 +++++++++++++++-- 2 files changed, 17 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/powerpc/nx-gzip/Makefile b/tools/testing/selftests/powerpc/nx-gzip/Makefile index 640fad6..0785c2e 100644 --- a/tools/testing/selftests/powerpc/nx-gzip/Makefile +++ b/tools/testing/selftests/powerpc/nx-gzip/Makefile @@ -1,8 +1,8 @@ -CFLAGS = -O3 -m64 -I./include +CFLAGS = -O3 -m64 -I./include -I../include TEST_GEN_FILES := gzfht_test gunz_test TEST_PROGS := nx-gzip-test.sh include ../../lib.mk -$(TEST_GEN_FILES): gzip_vas.c +$(TEST_GEN_FILES): gzip_vas.c ../utils.c diff --git a/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c b/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c index b099753..095195a 100644 --- a/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c +++ b/tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c @@ -60,6 +60,7 @@ #include #include #include +#include "utils.h" #include "nxu.h" #include "nx.h" @@ -70,6 +71,8 @@ FILE *nx_gzip_log; #define FNAME_MAX 1024 #define FEXT ".nx.gz" +#define SYSFS_MAX_REQ_BUF_PATH "devices/vio/ibm,compression-v1/nx_gzip_caps/req_max_processed_len" + /* * LZ counts returned in the user supplied nx_gzip_crb_cpb_t structure. */ @@ -244,6 +247,7 @@ int compress_file(int argc, char **argv, void *handle) struct nx_gzip_crb_cpb_t *cmdp; uint32_t pagelen = 65536; int fault_tries = NX_MAX_FAULTS; + char buf[32]; cmdp = (void *)(uintptr_t) aligned_alloc(sizeof(struct nx_gzip_crb_cpb_t), @@ -263,8 +267,17 @@ int compress_file(int argc, char **argv, void *handle) assert(NULL != (outbuf = (char *)malloc(outlen))); nxu_touch_pages(outbuf, outlen, pagelen, 1); - /* Compress piecemeal in smallish chunks */ - chunk = 1<<22; + /* + * On PowerVM, the hypervisor defines the maximum request buffer + * size is defined and this value is available via sysfs. + */ + if (!read_sysfs_file(SYSFS_MAX_REQ_BUF_PATH, buf, sizeof(buf))) { + chunk = atoi(buf); + } else { + /* sysfs entry is not available on PowerNV */ + /* Compress piecemeal in smallish chunks */ + chunk = 1<<22; + } /* Write the gzip header to the stream */ num_hdr_bytes = gzip_header_blank(outbuf); -- 2.7.4