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Message-ID: <2346143.zzXRFGWsWK@nvdebian>
Date: Thu, 20 Jan 2022 17:14:49 +1100
From: Alistair Popple <apopple@...dia.com>
To: <akpm@...ux-foundation.org>, <Felix.Kuehling@....com>,
<linux-mm@...ck.org>, <rcampbell@...dia.com>,
<linux-ext4@...r.kernel.org>, <linux-xfs@...r.kernel.org>,
Alex Sierra <alex.sierra@....com>
CC: <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
<hch@....de>, <jgg@...dia.com>, <jglisse@...hat.com>,
<willy@...radead.org>
Subject: Re: [PATCH v3 09/10] tools: update hmm-test to support device coherent type
On Tuesday, 11 January 2022 9:32:00 AM AEDT Alex Sierra wrote:
> Test cases such as migrate_fault and migrate_multiple, were modified to
> explicit migrate from device to sys memory without the need of page
> faults, when using device coherent type.
>
> Snapshot test case updated to read memory device type first and based
> on that, get the proper returned results migrate_ping_pong test case
Where is the migrate_ping_pong test? Did you perhaps forget to add it? :-)
> added to test explicit migration from device to sys memory for both
> private and coherent zone types.
>
> Helpers to migrate from device to sys memory and vicerversa
> were also added.
>
> Signed-off-by: Alex Sierra <alex.sierra@....com>
> ---
> v2:
> Set FIXTURE_VARIANT to add multiple device types to the FIXTURE. This
> will run all the tests for each device type (private and coherent) in
> case both existed during hmm-test driver probed.
> ---
> tools/testing/selftests/vm/hmm-tests.c | 122 ++++++++++++++++++++-----
> 1 file changed, 101 insertions(+), 21 deletions(-)
>
> diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c
> index 864f126ffd78..8eb81dfba4b3 100644
> --- a/tools/testing/selftests/vm/hmm-tests.c
> +++ b/tools/testing/selftests/vm/hmm-tests.c
> @@ -44,6 +44,14 @@ struct hmm_buffer {
> int fd;
> uint64_t cpages;
> uint64_t faults;
> + int zone_device_type;
> +};
> +
> +enum {
> + HMM_PRIVATE_DEVICE_ONE,
> + HMM_PRIVATE_DEVICE_TWO,
> + HMM_COHERENCE_DEVICE_ONE,
> + HMM_COHERENCE_DEVICE_TWO,
> };
>
> #define TWOMEG (1 << 21)
> @@ -60,6 +68,21 @@ FIXTURE(hmm)
> unsigned int page_shift;
> };
>
> +FIXTURE_VARIANT(hmm)
> +{
> + int device_number;
> +};
> +
> +FIXTURE_VARIANT_ADD(hmm, hmm_device_private)
> +{
> + .device_number = HMM_PRIVATE_DEVICE_ONE,
> +};
> +
> +FIXTURE_VARIANT_ADD(hmm, hmm_device_coherent)
> +{
> + .device_number = HMM_COHERENCE_DEVICE_ONE,
> +};
> +
> FIXTURE(hmm2)
> {
> int fd0;
> @@ -68,6 +91,24 @@ FIXTURE(hmm2)
> unsigned int page_shift;
> };
>
> +FIXTURE_VARIANT(hmm2)
> +{
> + int device_number0;
> + int device_number1;
> +};
> +
> +FIXTURE_VARIANT_ADD(hmm2, hmm2_device_private)
> +{
> + .device_number0 = HMM_PRIVATE_DEVICE_ONE,
> + .device_number1 = HMM_PRIVATE_DEVICE_TWO,
> +};
> +
> +FIXTURE_VARIANT_ADD(hmm2, hmm2_device_coherent)
> +{
> + .device_number0 = HMM_COHERENCE_DEVICE_ONE,
> + .device_number1 = HMM_COHERENCE_DEVICE_TWO,
> +};
> +
> static int hmm_open(int unit)
> {
> char pathname[HMM_PATH_MAX];
> @@ -81,12 +122,19 @@ static int hmm_open(int unit)
> return fd;
> }
>
> +static bool hmm_is_coherent_type(int dev_num)
> +{
> + return (dev_num >= HMM_COHERENCE_DEVICE_ONE);
> +}
> +
> FIXTURE_SETUP(hmm)
> {
> self->page_size = sysconf(_SC_PAGE_SIZE);
> self->page_shift = ffs(self->page_size) - 1;
>
> - self->fd = hmm_open(0);
> + self->fd = hmm_open(variant->device_number);
> + if (self->fd < 0 && hmm_is_coherent_type(variant->device_number))
> + SKIP(exit(0), "DEVICE_COHERENT not available");
> ASSERT_GE(self->fd, 0);
> }
>
> @@ -95,9 +143,11 @@ FIXTURE_SETUP(hmm2)
> self->page_size = sysconf(_SC_PAGE_SIZE);
> self->page_shift = ffs(self->page_size) - 1;
>
> - self->fd0 = hmm_open(0);
> + self->fd0 = hmm_open(variant->device_number0);
> + if (self->fd0 < 0 && hmm_is_coherent_type(variant->device_number0))
> + SKIP(exit(0), "DEVICE_COHERENT not available");
> ASSERT_GE(self->fd0, 0);
> - self->fd1 = hmm_open(1);
> + self->fd1 = hmm_open(variant->device_number1);
> ASSERT_GE(self->fd1, 0);
> }
>
> @@ -144,6 +194,7 @@ static int hmm_dmirror_cmd(int fd,
> }
> buffer->cpages = cmd.cpages;
> buffer->faults = cmd.faults;
> + buffer->zone_device_type = cmd.zone_device_type;
>
> return 0;
> }
> @@ -211,6 +262,20 @@ static void hmm_nanosleep(unsigned int n)
> nanosleep(&t, NULL);
> }
>
> +static int hmm_migrate_sys_to_dev(int fd,
> + struct hmm_buffer *buffer,
> + unsigned long npages)
> +{
> + return hmm_dmirror_cmd(fd, HMM_DMIRROR_MIGRATE_TO_DEV, buffer, npages);
> +}
> +
> +static int hmm_migrate_dev_to_sys(int fd,
> + struct hmm_buffer *buffer,
> + unsigned long npages)
> +{
> + return hmm_dmirror_cmd(fd, HMM_DMIRROR_MIGRATE_TO_SYS, buffer, npages);
> +}
> +
> /*
> * Simple NULL test of device open/close.
> */
> @@ -875,7 +940,7 @@ TEST_F(hmm, migrate)
> ptr[i] = i;
>
> /* Migrate memory to device. */
> - ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages);
> + ret = hmm_migrate_sys_to_dev(self->fd, buffer, npages);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, npages);
>
> @@ -923,7 +988,7 @@ TEST_F(hmm, migrate_fault)
> ptr[i] = i;
>
> /* Migrate memory to device. */
> - ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages);
> + ret = hmm_migrate_sys_to_dev(self->fd, buffer, npages);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, npages);
>
> @@ -936,7 +1001,7 @@ TEST_F(hmm, migrate_fault)
> ASSERT_EQ(ptr[i], i);
>
> /* Migrate memory to the device again. */
> - ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages);
> + ret = hmm_migrate_sys_to_dev(self->fd, buffer, npages);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, npages);
>
> @@ -976,7 +1041,7 @@ TEST_F(hmm, migrate_shared)
> ASSERT_NE(buffer->ptr, MAP_FAILED);
>
> /* Migrate memory to device. */
> - ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer, npages);
> + ret = hmm_migrate_sys_to_dev(self->fd, buffer, npages);
> ASSERT_EQ(ret, -ENOENT);
>
> hmm_buffer_free(buffer);
> @@ -1015,7 +1080,7 @@ TEST_F(hmm2, migrate_mixed)
> p = buffer->ptr;
>
> /* Migrating a protected area should be an error. */
> - ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, npages);
> + ret = hmm_migrate_sys_to_dev(self->fd1, buffer, npages);
> ASSERT_EQ(ret, -EINVAL);
>
> /* Punch a hole after the first page address. */
> @@ -1023,7 +1088,7 @@ TEST_F(hmm2, migrate_mixed)
> ASSERT_EQ(ret, 0);
>
> /* We expect an error if the vma doesn't cover the range. */
> - ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, 3);
> + ret = hmm_migrate_sys_to_dev(self->fd1, buffer, 3);
> ASSERT_EQ(ret, -EINVAL);
>
> /* Page 2 will be a read-only zero page. */
> @@ -1055,13 +1120,13 @@ TEST_F(hmm2, migrate_mixed)
>
> /* Now try to migrate pages 2-5 to device 1. */
> buffer->ptr = p + 2 * self->page_size;
> - ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, 4);
> + ret = hmm_migrate_sys_to_dev(self->fd1, buffer, 4);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, 4);
>
> /* Page 5 won't be migrated to device 0 because it's on device 1. */
> buffer->ptr = p + 5 * self->page_size;
> - ret = hmm_dmirror_cmd(self->fd0, HMM_DMIRROR_MIGRATE, buffer, 1);
> + ret = hmm_migrate_sys_to_dev(self->fd0, buffer, 1);
> ASSERT_EQ(ret, -ENOENT);
> buffer->ptr = p;
>
> @@ -1070,8 +1135,12 @@ TEST_F(hmm2, migrate_mixed)
> }
>
> /*
> - * Migrate anonymous memory to device private memory and fault it back to system
> - * memory multiple times.
> + * Migrate anonymous memory to device memory and back to system memory
> + * multiple times. In case of private zone configuration, this is done
> + * through fault pages accessed by CPU. In case of coherent zone configuration,
> + * the pages from the device should be explicitly migrated back to system memory.
> + * The reason is Coherent device zone has coherent access by CPU, therefore
> + * it will not generate any page fault.
> */
> TEST_F(hmm, migrate_multiple)
> {
> @@ -1107,8 +1176,7 @@ TEST_F(hmm, migrate_multiple)
> ptr[i] = i;
>
> /* Migrate memory to device. */
> - ret = hmm_dmirror_cmd(self->fd, HMM_DMIRROR_MIGRATE, buffer,
> - npages);
> + ret = hmm_migrate_sys_to_dev(self->fd, buffer, npages);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, npages);
>
> @@ -1116,7 +1184,12 @@ TEST_F(hmm, migrate_multiple)
> for (i = 0, ptr = buffer->mirror; i < size / sizeof(*ptr); ++i)
> ASSERT_EQ(ptr[i], i);
>
> - /* Fault pages back to system memory and check them. */
> + /* Migrate back to system memory and check them. */
> + if (hmm_is_coherent_type(variant->device_number)) {
> + ret = hmm_migrate_dev_to_sys(self->fd, buffer, npages);
So I think this will still pass even if nothing migrates so as mentioned on
the previous patch I think we need to check for the number of pages that
actually migrated. Alternatively I suppose you could do a snapshot and check
that, but that seems like it would be harder. Otherwise I think this looks
good.
> + ASSERT_EQ(ret, 0);
> + }
> +
> for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i)
> ASSERT_EQ(ptr[i], i);
>
> @@ -1312,13 +1385,13 @@ TEST_F(hmm2, snapshot)
>
> /* Page 5 will be migrated to device 0. */
> buffer->ptr = p + 5 * self->page_size;
> - ret = hmm_dmirror_cmd(self->fd0, HMM_DMIRROR_MIGRATE, buffer, 1);
> + ret = hmm_migrate_sys_to_dev(self->fd0, buffer, 1);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, 1);
>
> /* Page 6 will be migrated to device 1. */
> buffer->ptr = p + 6 * self->page_size;
> - ret = hmm_dmirror_cmd(self->fd1, HMM_DMIRROR_MIGRATE, buffer, 1);
> + ret = hmm_migrate_sys_to_dev(self->fd1, buffer, 1);
> ASSERT_EQ(ret, 0);
> ASSERT_EQ(buffer->cpages, 1);
>
> @@ -1335,9 +1408,16 @@ TEST_F(hmm2, snapshot)
> ASSERT_EQ(m[2], HMM_DMIRROR_PROT_ZERO | HMM_DMIRROR_PROT_READ);
> ASSERT_EQ(m[3], HMM_DMIRROR_PROT_READ);
> ASSERT_EQ(m[4], HMM_DMIRROR_PROT_WRITE);
> - ASSERT_EQ(m[5], HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL |
> - HMM_DMIRROR_PROT_WRITE);
> - ASSERT_EQ(m[6], HMM_DMIRROR_PROT_NONE);
> + if (!hmm_is_coherent_type(variant->device_number0)) {
> + ASSERT_EQ(m[5], HMM_DMIRROR_PROT_DEV_PRIVATE_LOCAL |
> + HMM_DMIRROR_PROT_WRITE);
> + ASSERT_EQ(m[6], HMM_DMIRROR_PROT_NONE);
> + } else {
> + ASSERT_EQ(m[5], HMM_DMIRROR_PROT_DEV_COHERENT_LOCAL |
> + HMM_DMIRROR_PROT_WRITE);
> + ASSERT_EQ(m[6], HMM_DMIRROR_PROT_DEV_COHERENT_REMOTE |
> + HMM_DMIRROR_PROT_WRITE);
> + }
>
> hmm_buffer_free(buffer);
> }
>
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