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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 <haren@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ed908341b1eb7ca0183c028a4ed4a0cf48bfe0f6.camel@linux.ibm.com
This commit is contained in:
Haren Myneni 2021-06-22 22:17:46 -07:00 committed by Michael Ellerman
parent 20ccb004ba
commit c6c27e3d84
2 changed files with 17 additions and 4 deletions
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4
tools/testing/selftests/powerpc/nx-gzip/Makefile
View File

@ -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

17
tools/testing/selftests/powerpc/nx-gzip/gzfht_test.c
View File

@ -60,6 +60,7 @@
#include <assert.h>
#include <errno.h>
#include <signal.h>
#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);