[Intel-gfx] [PATCH i-g-t v3 1/4] chamelium: Calculate CRC from framebuffer instead of hardcoding it
Lyude Paul
lyude at redhat.com
Wed Jul 5 20:49:27 UTC 2017
On Wed, 2017-07-05 at 16:34 -0400, Lyude Paul wrote:
> So a couple of notes here that will make it a lot easier for me to
> review these in the future
>
> * When you're doing a new revision of a patch series, it's helpful
> to
> keep it in the same email thread as the original v1 so it's easier
> to keep track of in people's mail clients (as well as avoiding
> accidentally reviewing older patch versions. I usually do
> something
> like this (other projects might request you do this slightly
> differently, but this should be fine here):
> * [PATCH 0/2] Cleaning up the alignment of various foos
> * [PATCH 1/2] Foo the bar, not the baz
> * [PATCH 2/2] Introduce the amazing new foo_bar
> * [PATCH v2 0/2] Cleaning up the alignment of various foos
> * [PATCH v2 1/2] Foo the bar, not the baz
> * [PATCH v2 2/2] Introduce the amazing new foo_bar
> * [PATCH v3 0/2] Cleaning up the alignment of various foos
> * [PATCH v3 1/2] Foo the bar, not the baz
> * [PATCH v3 2/2] Introduce the amazing new foo_bar
> * Try not to group unrelated patches together in the same thread.
> This
> also makes sorting through all of them a little more difficult.
> * When you make new revisions of patches, it's very useful if you
> also
> include a list of changes you made to the patch since the last
> revision. It doesn't need to be very finely detailed, something
> like
> this would suffice:
> * Various style fixes
> * Rename baz to moo, add cow noises
> * Split init_cow() into init_white_cow() and init_black_cow()
> instead of handling both kinds of cows in the same function
> * Fix documentation
> For intel-gpu-tools, it's fine to just stick this in the commit
> message. Other projects may request you put the changelog below
> the
> ----- right above the diff stats (this allows the comments not to
> get included in the final commit message)
> * Unless they are all very small and less important fixes, including
> cover letters helps as well since it lets patchwork group together
> patch series like this.
>
> Anyway, back to the actual patch:
> A good start! Will need a couple of changes though
>
> On Wed, 2017-07-05 at 11:04 +0300, Paul Kocialkowski wrote:
> > This introduces CRC calculation for reference frames, instead of
> > using
> > hardcoded values for them. The rendering of reference frames may
> > differ
> > from machine to machine, especially due to font rendering, and the
> > frame itself may change with subsequent IGT changes.
> >
> > These differences would cause the CRC checks to fail on different
> > setups. This allows them to pass regardless of the setup.
> >
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski at linux.intel.com
> > >
> > ---
> > lib/igt_chamelium.c | 160
> > ++++++++++++++++++++++++++++++++++++++++++++++++++++
> > lib/igt_chamelium.h | 5 ++
> > tests/chamelium.c | 76 ++++++-------------------
> > 3 files changed, 183 insertions(+), 58 deletions(-)
> >
> > diff --git a/lib/igt_chamelium.c b/lib/igt_chamelium.c
> > index bff08c0e..b9d80b6b 100644
> > --- a/lib/igt_chamelium.c
> > +++ b/lib/igt_chamelium.c
> > @@ -94,6 +94,14 @@ struct chamelium_frame_dump {
> > struct chamelium_port *port;
> > };
> >
> > +struct chamelium_fb_crc {
> > + int fd;
> > + struct igt_fb *fb;
> > +
> > + pthread_t thread_id;
> > + igt_crc_t *ret;
> > +};
> > +
>
> The name of this structure is a little misleading, because now we
> have
> an API that exposes both a struct chamelium_fb_crc struct in addition
> to the igt_crc_t struct. Rename this to something like struct
> chamelium_fb_crc_work
>
> > struct chamelium {
> > xmlrpc_env env;
> > xmlrpc_client *client;
> > @@ -1003,6 +1011,158 @@ int chamelium_get_frame_limit(struct
> > chamelium *chamelium,
> > return ret;
> > }
> >
> > +static uint32_t chamelium_xrgb_hash16(unsigned char *buffer, int
> > width,
> > + int height, int k, int m)
> > +{
>
> We're not modifying buffer, so make it a const. As well, feel free to
> mark this function as inline.
>
> > + unsigned char r, g, b;
> > + uint64_t sum = 0;
> > + uint64_t count = 0;
> > + uint64_t value;
> > + uint32_t hash;
> > + int index;
> > + int i;
> > +
> > + for (i=0; i < width * height; i++) {
> > + if ((i % m) != k)
> > + continue;
> > +
> > + index = i * 4;
> > +
> > + r = buffer[index + 2];
> > + g = buffer[index + 1];
> > + b = buffer[index + 0];
> > +
> > + value = r | (g << 8) | (b << 16);
> > + sum += ++count * value;
> > + }
> > +
> > + hash = ((sum >> 0) ^ (sum >> 16) ^ (sum >> 32) ^ (sum >>
> > 48)) & 0xffff;
> > +
> > + return hash;
> > +}
> > +
> > +/**
> > + * chamelium_calculate_fb_crc:
> > + * @fd: The drm file descriptor
> > + * @fb: The framebuffer to calculate the CRC for
> > + *
> > + * Calculates a CRC for the provided framebuffer, the same way as
> > the Chamelium.
>
> Calculate the CRC for the provided framebuffer, using the Chamelium's
> CRC algorithm
> > + * This calculates the CRC in a non-threaded fashion.
> > + *
> > + * Returns: The calculated CRC
> > + */
> > +igt_crc_t *chamelium_calculate_fb_crc(int fd, struct igt_fb *fb)
> > +{
> > + igt_crc_t *ret;
> > + cairo_t *cr;
> > + cairo_surface_t *fb_surface;
> > + unsigned char *buffer;
> > + int n = 4;
> > + int w, h;
> > + int i, j;
> > +
> > + ret = calloc(1, sizeof(igt_crc_t));
> > +
> > + /* Get the cairo surface for the framebuffer */
> > + cr = igt_get_cairo_ctx(fd, fb);
> > + fb_surface = cairo_get_target(cr);
> > + cairo_surface_reference(fb_surface);
> > + cairo_destroy(cr);
> > +
> > + buffer = cairo_image_surface_get_data(fb_surface);
> > + w = fb->width;
> > + h = fb->height;
> > +
> > + for (i = 0; i < n; i++) {
> > + j = n - i - 1;
> > + ret->crc[i] = chamelium_xrgb_hash16(buffer, w, h,
> > j,
> > n);
> > + }
> > +
> > + ret->n_words = n;
> > + cairo_surface_destroy(fb_surface);
> > +
> > + return ret;
> > +}
> > +
> > +static void *chamelium_calculate_fb_crc_thread(void *data)
> > +{
> > + struct chamelium_fb_crc *fb_crc = (struct chamelium_fb_crc
> > *) data;
> > + cairo_t *cr;
> > + cairo_surface_t *fb_surface;
> > + unsigned char *buffer;
> > + int n = 4;
> > + int w, h;
> > + int i, j;
> > +
> > + /* Get the cairo surface for the framebuffer */
> > + cr = igt_get_cairo_ctx(fb_crc->fd, fb_crc->fb);
> > + fb_surface = cairo_get_target(cr);
> > + cairo_surface_reference(fb_surface);
> > + cairo_destroy(cr);
> > +
> > + buffer = cairo_image_surface_get_data(fb_surface);
> > + w = fb_crc->fb->width;
> > + h = fb_crc->fb->height;
> > +
> > + for (i = 0; i < n; i++) {
> > + j = n - i - 1;
> > + fb_crc->ret->crc[i] =
> > chamelium_xrgb_hash16(buffer,
> > w, h, j, n);
> > + }
> > +
> > + fb_crc->ret->n_words = n;
> > + cairo_surface_destroy(fb_surface);
> > +
> > + return NULL;
> > +}
Bleh, I completely forgot to mention this:
This part of code definitely needs to be deduplicated. The only
difference between the threaded version and the non threaded version is
where they take their input from and where/how they store their
results. I would just do something like this (anything marked as static
here is not exposed through the api of course)
static chamelium_do_calculate_fb_crc(fd, fb, out)
Performs actual CRC calculations
chamelium_calculate_fb_crc(fd, fb)
Allocates storage for results and runs
chamelium_do_calculate_fb_crc() in single threaded context
static chamelium_calculate_fb_crc_async_work(data)
Actual function that's run for the calculation thread, calls
chamelium_do_calculate_fb_crc with the appropriate arguments given
to us from the generic data pointer
chamelium_calculate_fb_crc_async(fd, fb)
Entrypoint for starting an async fb crc calculation, returns a
fb_crc_async_work struct
chamelium_calculate_fb_crc_finish(work)
Synchronizes with the calculation thread, waits for the result and
blocks until it's ready then returns it.
> > +
> > +/**
> > + * chamelium_calculate_fb_crc_launch:
> > + * @fd: The drm file descriptor
> > + * @fb: The framebuffer to calculate the CRC for
> > + *
> > + * Launches the CRC calculation for the provided framebuffer, the
> > same way as
> > + * the Chamelium. This calculates the CRC in a threaded fashion.
> > + * Thread-related information is returned and should be passed to
> > a
> > subsequent
> > + * call to chamelium_calculate_fb_crc_result. It should not be
> > freed.
> > + *
> > + * Returns: An intermediate structure with thread-related
> > information
>
> The user doesn't need to know about the magic inside the structure,
> since we're not going to expose it's definition outside of this file
> anyway.
> > + */
> > +struct chamelium_fb_crc *chamelium_calculate_fb_crc_launch(int fd,
> > + struct
> > igt_fb *fb)
> > +{
> > + struct chamelium_fb_crc *fb_crc;
> > +
> > + fb_crc = calloc(1, sizeof(struct chamelium_fb_crc));
> > + fb_crc->ret = calloc(1, sizeof(igt_crc_t));
> > + fb_crc->fd = fd;
> > + fb_crc->fb = fb;
> > +
> > + pthread_create(&fb_crc->thread_id, NULL,
> > + chamelium_calculate_fb_crc_thread, fb_crc);
> > +
> > + return fb_crc;
> > +}
> > +
> > +/**
> > + * chamelium_calculate_fb_crc_result:
> > + * @fb_crc: An intermediate structure with thread-related
> > information
> > + *
> > + * Provides the result for the previously-launched CRC
> > calculation.
>
> Blocks until the async CRC calculation is finished, and then returns
> the result.
> > + *
> > + * Returns: The calculated CRC
> > + */
> > +igt_crc_t *chamelium_calculate_fb_crc_result(struct
> > chamelium_fb_crc
> > *fb_crc)
> > +{
> > + igt_crc_t *ret;
> > +
> > + pthread_join(fb_crc->thread_id, NULL);
> > +
> > + ret = fb_crc->ret;
> > + free(fb_crc);
> > +
> > + return ret;
> > +}
> > +
> > static unsigned int chamelium_get_port_type(struct chamelium
> > *chamelium,
> > struct chamelium_port
> > *port)
> > {
> > diff --git a/lib/igt_chamelium.h b/lib/igt_chamelium.h
> > index 81322ad2..e51cf4f9 100644
> > --- a/lib/igt_chamelium.h
> > +++ b/lib/igt_chamelium.h
> > @@ -36,6 +36,7 @@
> > struct chamelium;
> > struct chamelium_port;
> > struct chamelium_frame_dump;
> > +struct chamelium_fb_crc;
> >
> > struct chamelium *chamelium_init(int drm_fd);
> > void chamelium_deinit(struct chamelium *chamelium);
> > @@ -92,6 +93,10 @@ struct chamelium_frame_dump
> > *chamelium_port_dump_pixels(struct chamelium *chamel
> > struct
> > chamelium_port *port,
> > int x, int
> > y,
> > int w, int
> > h);
> > +igt_crc_t *chamelium_calculate_fb_crc(int fd, struct igt_fb *fb);
> > +struct chamelium_fb_crc *chamelium_calculate_fb_crc_launch(int fd,
> > + struct
> > igt_fb *fb);
> > +igt_crc_t *chamelium_calculate_fb_crc_result(struct
> > chamelium_fb_crc
> > *fb_crc);
> > int chamelium_get_captured_frame_count(struct chamelium
> > *chamelium);
> > int chamelium_get_frame_limit(struct chamelium *chamelium,
> > struct chamelium_port *port,
> > diff --git a/tests/chamelium.c b/tests/chamelium.c
> > index e3067664..3fd2b02c 100644
> > --- a/tests/chamelium.c
> > +++ b/tests/chamelium.c
> > @@ -49,43 +49,6 @@ typedef struct {
> > #define HPD_TOGGLE_COUNT_VGA 5
> > #define HPD_TOGGLE_COUNT_DP_HDMI 15
> >
> > -/* Pre-calculated CRCs for the pattern fb, for all the modes in
> > the
> > default
> > - * chamelium edid
> > - */
> > -struct crc_entry {
> > - int width;
> > - int height;
> > - igt_crc_t crc;
> > -};
> > -
> > -#define CRC_ENTRY(w_, h_, ...) \
> > - { w_, h_, { .n_words = 4, .crc = { __VA_ARGS__ } } }
> > -
> > -static const struct crc_entry pattern_fb_crcs[] = {
> > - CRC_ENTRY(1920, 1080, 0xf859, 0xa751, 0x8c81, 0x45a1),
> > - CRC_ENTRY(1280, 720, 0xcec2, 0x4246, 0x6cfd, 0xeb43),
> > - CRC_ENTRY(1024, 768, 0x85e5, 0xf0cd, 0xafe3, 0x7f18),
> > - CRC_ENTRY( 800, 600, 0x6b39, 0x32b6, 0x831a, 0xb03e),
> > - CRC_ENTRY( 640, 480, 0xa121, 0x2473, 0xb150, 0x8c47),
> > -};
> > -#undef CRC_ENTRY
> > -
> > -static const igt_crc_t *
> > -get_precalculated_crc(struct chamelium_port *port, int w, int h)
> > -{
> > - int i;
> > - const struct crc_entry *entry;
> > -
> > - for (i = 0; i < ARRAY_SIZE(pattern_fb_crcs); i++) {
> > - entry = &pattern_fb_crcs[i];
> > -
> > - if (entry->width == w && entry->height == h)
> > - return &entry->crc;
> > - }
> > -
> > - return NULL;
> > -}
> > -
> > static void
> > require_connector_present(data_t *data, unsigned int type)
> > {
> > @@ -424,7 +387,8 @@ test_display_crc_single(data_t *data, struct
> > chamelium_port *port)
> > igt_output_t *output;
> > igt_plane_t *primary;
> > igt_crc_t *crc;
> > - const igt_crc_t *expected_crc;
> > + igt_crc_t *expected_crc;
> > + struct chamelium_fb_crc *fb_crc;
> > struct igt_fb fb;
> > drmModeModeInfo *mode;
> > drmModeConnector *connector;
> > @@ -447,24 +411,21 @@ test_display_crc_single(data_t *data, struct
> > chamelium_port *port)
> > 0, 0, 0, &fb);
> > igt_assert(fb_id > 0);
> >
> > - enable_output(data, port, output, mode, &fb);
> > + fb_crc = chamelium_calculate_fb_crc_launch(data-
> > > drm_fd, &fb);
> >
> >
> > - expected_crc = get_precalculated_crc(port,
> > - mode-
> > >hdisplay,
> > - mode-
> > > vdisplay);
> >
> > - if (!expected_crc) {
> > - igt_warn("No precalculated CRC found for
> > %dx%d, skipping CRC check\n",
> > - mode->hdisplay, mode->vdisplay);
> > - goto next;
> > - }
> > + enable_output(data, port, output, mode, &fb);
> >
> > igt_debug("Testing single CRC fetch\n");
> > +
> > crc = chamelium_get_crc_for_area(data->chamelium,
> > port,
> > 0, 0, 0, 0);
> > +
> > + expected_crc =
> > chamelium_calculate_fb_crc_result(fb_crc);
> > +
> > igt_assert_crc_equal(crc, expected_crc);
> > + free(expected_crc);
> > free(crc);
> >
> > -next:
> > disable_output(data, port, output);
> > igt_remove_fb(data->drm_fd, &fb);
> > }
> > @@ -480,7 +441,8 @@ test_display_crc_multiple(data_t *data, struct
> > chamelium_port *port)
> > igt_output_t *output;
> > igt_plane_t *primary;
> > igt_crc_t *crc;
> > - const igt_crc_t *expected_crc;
> > + igt_crc_t *expected_crc;
> > + struct chamelium_fb_crc *fb_crc;
> > struct igt_fb fb;
> > drmModeModeInfo *mode;
> > drmModeConnector *connector;
> > @@ -503,15 +465,9 @@ test_display_crc_multiple(data_t *data, struct
> > chamelium_port *port)
> > 0, 0, 0, &fb);
> > igt_assert(fb_id > 0);
> >
> > - enable_output(data, port, output, mode, &fb);
> > + fb_crc = chamelium_calculate_fb_crc_launch(data-
> > > drm_fd, &fb);
> >
> >
> > - expected_crc = get_precalculated_crc(port, mode-
> > > hdisplay,
> >
> > - mode-
> > > vdisplay);
> >
> > - if (!expected_crc) {
> > - igt_warn("No precalculated CRC found for
> > %dx%d, skipping CRC check\n",
> > - mode->hdisplay, mode->vdisplay);
> > - goto next;
> > - }
> > + enable_output(data, port, output, mode, &fb);
> >
> > /* We want to keep the display running for a
> > little
> > bit, since
> > * there's always the potential the driver isn't
> > able to keep
> > @@ -522,11 +478,15 @@ test_display_crc_multiple(data_t *data,
> > struct
> > chamelium_port *port)
> > &captured_frame
> > _c
> > ount);
> >
> > igt_debug("Captured %d frames\n",
> > captured_frame_count);
> > +
> > + expected_crc =
> > chamelium_calculate_fb_crc_result(fb_crc);
> > +
> > for (j = 0; j < captured_frame_count; j++)
> > igt_assert_crc_equal(&crc[j],
> > expected_crc);
> > +
> > + free(expected_crc);
> > free(crc);
> >
> > -next:
> > disable_output(data, port, output);
> > igt_remove_fb(data->drm_fd, &fb);
> > }
--
Cheers,
Lyude
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