From: Alex Sierra <alex.sierra@amd.com>
To: <jgg@nvidia.com>
Cc: rcampbell@nvidia.com, willy@infradead.org, david@redhat.com,
Felix.Kuehling@amd.com, apopple@nvidia.com,
amd-gfx@lists.freedesktop.org, linux-xfs@vger.kernel.org,
linux-mm@kvack.org, jglisse@redhat.com,
dri-devel@lists.freedesktop.org, akpm@linux-foundation.org,
linux-ext4@vger.kernel.org, hch@lst.de
Subject: [PATCH v1 14/15] tools: add hmm gup tests for device coherent type
Date: Thu, 5 May 2022 16:34:37 -0500 [thread overview]
Message-ID: <20220505213438.25064-15-alex.sierra@amd.com> (raw)
In-Reply-To: <20220505213438.25064-1-alex.sierra@amd.com>
The intention is to test hmm device coherent type under different get
user pages paths. Also, test gup with FOLL_LONGTERM flag set in
device coherent pages. These pages should get migrated back to system
memory.
Signed-off-by: Alex Sierra <alex.sierra@amd.com>
---
tools/testing/selftests/vm/hmm-tests.c | 104 +++++++++++++++++++++++++
1 file changed, 104 insertions(+)
diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c
index 84ec8c4a1dc7..65e30ab6494c 100644
--- a/tools/testing/selftests/vm/hmm-tests.c
+++ b/tools/testing/selftests/vm/hmm-tests.c
@@ -36,6 +36,7 @@
* in the usual include/uapi/... directory.
*/
#include "../../../../lib/test_hmm_uapi.h"
+#include "../../../../mm/gup_test.h"
struct hmm_buffer {
void *ptr;
@@ -60,6 +61,8 @@ enum {
#define NTIMES 10
#define ALIGN(x, a) (((x) + (a - 1)) & (~((a) - 1)))
+/* Just the flags we need, copied from mm.h: */
+#define FOLL_WRITE 0x01 /* check pte is writable */
FIXTURE(hmm)
{
@@ -1766,4 +1769,105 @@ TEST_F(hmm, exclusive_cow)
hmm_buffer_free(buffer);
}
+static int gup_test_exec(int gup_fd, unsigned long addr,
+ int cmd, int npages, int size)
+{
+ struct gup_test gup = {
+ .nr_pages_per_call = npages,
+ .addr = addr,
+ .gup_flags = FOLL_WRITE,
+ .size = size,
+ };
+
+ if (ioctl(gup_fd, cmd, &gup)) {
+ perror("ioctl on error\n");
+ return errno;
+ }
+
+ return 0;
+}
+
+/*
+ * Test get user device pages through gup_test. Setting PIN_LONGTERM flag.
+ * This should trigger a migration back to system memory for both, private
+ * and coherent type pages.
+ * This test makes use of gup_test module. Make sure GUP_TEST_CONFIG is added
+ * to your configuration before you run it.
+ */
+TEST_F(hmm, hmm_gup_test)
+{
+ struct hmm_buffer *buffer;
+ int gup_fd;
+ unsigned long npages;
+ unsigned long size;
+ unsigned long i;
+ int *ptr;
+ int ret;
+ unsigned char *m;
+
+ gup_fd = open("/sys/kernel/debug/gup_test", O_RDWR);
+ if (gup_fd == -1)
+ SKIP(return, "Skipping test, could not find gup_test driver");
+
+ npages = 3;
+ size = npages << self->page_shift;
+
+ buffer = malloc(sizeof(*buffer));
+ ASSERT_NE(buffer, NULL);
+
+ buffer->fd = -1;
+ buffer->size = size;
+ buffer->mirror = malloc(size);
+ ASSERT_NE(buffer->mirror, NULL);
+
+ buffer->ptr = mmap(NULL, size,
+ PROT_READ | PROT_WRITE,
+ MAP_PRIVATE | MAP_ANONYMOUS,
+ buffer->fd, 0);
+ ASSERT_NE(buffer->ptr, MAP_FAILED);
+
+ /* Initialize buffer in system memory. */
+ for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i)
+ ptr[i] = i;
+
+ /* Migrate memory to device. */
+ ret = hmm_migrate_sys_to_dev(self->fd, buffer, npages);
+ ASSERT_EQ(ret, 0);
+ ASSERT_EQ(buffer->cpages, npages);
+ /* Check what the device read. */
+ for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i)
+ ASSERT_EQ(ptr[i], i);
+
+ ASSERT_EQ(gup_test_exec(gup_fd,
+ (unsigned long)buffer->ptr,
+ GUP_BASIC_TEST, 1, self->page_size), 0);
+ ASSERT_EQ(gup_test_exec(gup_fd,
+ (unsigned long)buffer->ptr + 1 * self->page_size,
+ GUP_FAST_BENCHMARK, 1, self->page_size), 0);
+ ASSERT_EQ(gup_test_exec(gup_fd,
+ (unsigned long)buffer->ptr + 2 * self->page_size,
+ PIN_LONGTERM_BENCHMARK, 1, self->page_size), 0);
+
+ /* Take snapshot to CPU pagetables */
+ ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_SNAPSHOT, buffer, npages);
+ ASSERT_EQ(ret, 0);
+ ASSERT_EQ(buffer->cpages, npages);
+ m = buffer->mirror;
+ if (hmm_is_coherent_type(variant->device_number)) {
+ ASSERT_EQ(HMM_DMIRROR_PROT_DEV_COHERENT_LOCAL | HMM_DMIRROR_PROT_WRITE, m[0]);
+ ASSERT_EQ(HMM_DMIRROR_PROT_DEV_COHERENT_LOCAL | HMM_DMIRROR_PROT_WRITE, m[1]);
+ } else {
+ ASSERT_EQ(HMM_DMIRROR_PROT_WRITE, m[0]);
+ ASSERT_EQ(HMM_DMIRROR_PROT_WRITE, m[1]);
+ }
+ ASSERT_EQ(HMM_DMIRROR_PROT_WRITE, m[2]);
+ /* Check again the content on the pages. Make sure there's no
+ * corrupted data.
+ */
+ for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i)
+ ASSERT_EQ(ptr[i], i);
+
+ close(gup_fd);
+ hmm_buffer_free(buffer);
+}
TEST_HARNESS_MAIN
--
2.32.0
next prev parent reply other threads:[~2022-05-05 21:35 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-05 21:34 [PATCH v1 00/15] Add MEMORY_DEVICE_COHERENT for coherent device memory mapping Alex Sierra
2022-05-05 21:34 ` [PATCH v1 01/15] mm: add zone device coherent type memory support Alex Sierra
2022-05-12 2:58 ` Alistair Popple
2022-05-12 18:45 ` Sierra Guiza, Alejandro (Alex)
2022-05-05 21:34 ` [PATCH v1 02/15] mm: add device coherent vma selection for memory migration Alex Sierra
2022-05-05 21:34 ` [PATCH v1 03/15] mm: remove the vma check in migrate_vma_setup() Alex Sierra
2022-05-05 21:34 ` [PATCH v1 04/15] mm: add device coherent checker to remove migration pte Alex Sierra
2022-05-05 21:38 ` Sierra Guiza, Alejandro (Alex)
2022-05-05 22:48 ` Alistair Popple
2022-05-12 2:39 ` Alistair Popple
2022-05-05 21:34 ` [PATCH v1 05/15] mm/gup: migrate device coherent pages when pinning instead of failing Alex Sierra
2022-05-05 21:34 ` [PATCH v1 06/15] drm/amdkfd: add SPM support for SVM Alex Sierra
2022-05-05 21:34 ` [PATCH v1 07/15] drm/amdkfd: coherent type as sys mem on migration to ram Alex Sierra
2022-05-05 21:34 ` [PATCH v1 08/15] lib: test_hmm add ioctl to get zone device type Alex Sierra
2022-05-05 21:34 ` [PATCH v1 09/15] lib: test_hmm add module param for " Alex Sierra
2022-05-05 21:34 ` [PATCH v1 10/15] lib: add support for device coherent type in test_hmm Alex Sierra
2022-05-05 21:34 ` [PATCH v1 11/15] tools: update hmm-test to support device coherent type Alex Sierra
2022-05-05 21:34 ` [PATCH v1 12/15] tools: update test_hmm script to support SP config Alex Sierra
2022-05-05 21:34 ` [PATCH v1 13/15] mm: handling Non-LRU pages returned by vm_normal_pages Alex Sierra
2022-05-11 18:50 ` Jason Gunthorpe
2022-05-12 22:33 ` Sierra Guiza, Alejandro (Alex)
2022-05-13 11:45 ` Jason Gunthorpe
2022-05-05 21:34 ` Alex Sierra [this message]
2022-05-16 8:02 ` [PATCH v1 14/15] tools: add hmm gup tests for device coherent type Alistair Popple
2022-05-05 21:34 ` [PATCH v1 15/15] tools: add selftests to hmm for COW in device memory Alex Sierra
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