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backend/drm: Simplify object matching code

Browse Source 
We originally used match_obj on planes, but this was largely
unnecessary. Instead, this assigns planes statically at startup.
master
Scott Anderson 6 years ago committed by Simon Ser
parent d80acadfd8
commit b3f42548d0
2 changed files with 223 additions and 338 deletions
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468
backend/drm/drm.c
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@ -1,4 +1,4 @@
#define _POSIX_C_SOURCE 200112L
#define _XOPEN_SOURCE 700
#include <assert.h>
#include <drm_fourcc.h>
#include <drm_mode.h>
@ -10,6 +10,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <time.h>
#include <wayland-server.h>
#include <wayland-util.h>
@ -72,60 +73,29 @@ bool check_drm_features(struct wlr_drm_backend *drm) {
return true;
}
static int cmp_plane(const void *arg1, const void *arg2) {
const struct wlr_drm_plane *a = arg1;
const struct wlr_drm_plane *b = arg2;
static bool add_plane(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc, drmModePlane *drm_plane,
uint32_t type, union wlr_drm_plane_props *props) {
assert(!(type == DRM_PLANE_TYPE_PRIMARY && crtc->primary));
return (int)a->type - (int)b->type;
}
static bool init_planes(struct wlr_drm_backend *drm) {
drmModePlaneRes *plane_res = drmModeGetPlaneResources(drm->fd);
if (!plane_res) {
wlr_log_errno(WLR_ERROR, "Failed to get DRM plane resources");
return false;
}
wlr_log(WLR_INFO, "Found %"PRIu32" DRM planes", plane_res->count_planes);
if (plane_res->count_planes == 0) {
drmModeFreePlaneResources(plane_res);
if (type == DRM_PLANE_TYPE_CURSOR && crtc->cursor) {
return true;
}
drm->num_planes = plane_res->count_planes;
drm->planes = calloc(drm->num_planes, sizeof(*drm->planes));
if (!drm->planes) {
struct wlr_drm_plane *p = calloc(1, sizeof(*p));
if (!p) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
goto error_res;
}
for (size_t i = 0; i < drm->num_planes; ++i) {
struct wlr_drm_plane *p = &drm->planes[i];
drmModePlane *plane = drmModeGetPlane(drm->fd, plane_res->planes[i]);
if (!plane) {
wlr_log_errno(WLR_ERROR, "Failed to get DRM plane");
goto error_planes;
}
p->id = plane->plane_id;
p->possible_crtcs = plane->possible_crtcs;
uint64_t type;
if (!get_drm_plane_props(drm->fd, p->id, &p->props) ||
!get_drm_prop(drm->fd, p->id, p->props.type, &type)) {
drmModeFreePlane(plane);
goto error_planes;
return false;
}
p->type = type;
drm->num_type_planes[type]++;
p->id = drm_plane->plane_id;
p->props = *props;
// Choose an RGB format for the plane
uint32_t rgb_format = DRM_FORMAT_INVALID;
for (size_t j = 0; j < plane->count_formats; ++j) {
uint32_t fmt = plane->formats[j];
for (size_t j = 0; j < drm_plane->count_formats; ++j) {
uint32_t fmt = drm_plane->formats[j];
wlr_drm_format_set_add(&p->formats, fmt, DRM_FORMAT_MOD_INVALID);
if (fmt == DRM_FORMAT_ARGB8888) {
@ -136,30 +106,19 @@ static bool init_planes(struct wlr_drm_backend *drm) {
rgb_format = fmt;
}
}
// Some overlays exist which don't support XRGB8888/ARGB8888
// We aren't even using overlay planes currently, so don't fail
// on something unnecessary.
if (type != DRM_PLANE_TYPE_OVERLAY && rgb_format == DRM_FORMAT_INVALID) {
wlr_log(WLR_ERROR, "Failed to find an RGB format for plane %zu", i);
drmModeFreePlane(plane);
goto error_planes;
}
p->drm_format = rgb_format;
if (p->props.in_formats) {
uint64_t blob_id;
if (!get_drm_prop(drm->fd, p->id, p->props.in_formats, &blob_id)) {
wlr_log(WLR_ERROR, "Failed to read IN_FORMATS property");
drmModeFreePlane(plane);
goto error_planes;
goto error;
}
drmModePropertyBlobRes *blob =
drmModeGetPropertyBlob(drm->fd, blob_id);
drmModePropertyBlobRes *blob = drmModeGetPropertyBlob(drm->fd, blob_id);
if (!blob) {
wlr_log(WLR_ERROR, "Failed to read IN_FORMATS blob");
drmModeFreePlane(plane);
goto error_planes;
goto error;
}
struct drm_format_modifier_blob *data = blob->data;
@ -178,28 +137,99 @@ static bool init_planes(struct wlr_drm_backend *drm) {
drmModeFreePropertyBlob(blob);
}
switch (type) {
case DRM_PLANE_TYPE_PRIMARY:
crtc->primary = p;
break;
case DRM_PLANE_TYPE_CURSOR:
crtc->cursor = p;
break;
default:
abort();
}
return true;
error:
free(p);
return false;
}
static bool init_planes(struct wlr_drm_backend *drm) {
drmModePlaneRes *plane_res = drmModeGetPlaneResources(drm->fd);
if (!plane_res) {
wlr_log_errno(WLR_ERROR, "Failed to get DRM plane resources");
return false;
}
wlr_log(WLR_INFO, "Found %"PRIu32" DRM planes", plane_res->count_planes);
for (uint32_t i = 0; i < plane_res->count_planes; ++i) {
uint32_t id = plane_res->planes[i];
drmModePlane *plane = drmModeGetPlane(drm->fd, id);
if (!plane) {
wlr_log_errno(WLR_ERROR, "Failed to get DRM plane");
goto error;
}
union wlr_drm_plane_props props = {0};
if (!get_drm_plane_props(drm->fd, id, &props)) {
drmModeFreePlane(plane);
goto error;
}
wlr_log(WLR_INFO, "(%zu overlay, %zu primary, %zu cursor)",
drm->num_overlay_planes,
drm->num_primary_planes,
drm->num_cursor_planes);
uint64_t type;
if (!get_drm_prop(drm->fd, id, props.type, &type)) {
drmModeFreePlane(plane);
goto error;
}
/*
* This is a very naive implementation of the plane matching
* logic. Primary and cursor planes should only work on a
* single CRTC, and this should be perfectly adequate, but
* overlay planes can potentially work with multiple CRTCs,
* meaning this could return inefficent/skewed results.
*
* However, we don't really care about overlay planes, as we
* don't support them yet. We only bother to keep basic
* tracking of them for DRM lease clients.
*
* possible_crtcs is a bitmask of crtcs, where each bit is an
* index into drmModeRes.crtcs. So if bit 0 is set (ffs starts
* counting from 1), crtc 0 is possible.
*/
int crtc_bit = ffs(plane->possible_crtcs) - 1;
// This would be a kernel bug
assert(crtc_bit >= 0 && (size_t)crtc_bit < drm->num_crtcs);
struct wlr_drm_crtc *crtc = &drm->crtcs[crtc_bit];
if (type == DRM_PLANE_TYPE_OVERLAY) {
uint32_t *tmp = realloc(crtc->overlays,
sizeof(*crtc->overlays) * (crtc->num_overlays + 1));
if (tmp) {
crtc->overlays = tmp;
crtc->overlays[crtc->num_overlays++] = id;
}
drmModeFreePlane(plane);
continue;
}
qsort(drm->planes, drm->num_planes, sizeof(*drm->planes), cmp_plane);
if (!add_plane(drm, crtc, plane, type, &props)) {
drmModeFreePlane(plane);
goto error;
}
drm->overlay_planes = drm->planes;
drm->primary_planes = drm->overlay_planes
+ drm->num_overlay_planes;
drm->cursor_planes = drm->primary_planes
+ drm->num_primary_planes;
drmModeFreePlane(plane);
}
drmModeFreePlaneResources(plane_res);
return true;
error_planes:
free(drm->planes);
error_res:
error:
drmModeFreePlaneResources(plane_res);
return false;
}
@ -252,26 +282,33 @@ void finish_drm_resources(struct wlr_drm_backend *drm) {
return;
}
for (size_t i = 0; i < drm->num_planes; ++i) {
struct wlr_drm_plane *p = &drm->planes[i];
wlr_drm_format_set_finish(&p->formats);
}
for (size_t i = 0; i < drm->num_crtcs; ++i) {
struct wlr_drm_crtc *crtc = &drm->crtcs[i];
drmModeAtomicFree(crtc->atomic);
drmModeFreeCrtc(crtc->legacy_crtc);
if (crtc->mode_id) {
drmModeDestroyPropertyBlob(drm->fd, crtc->mode_id);
}
if (crtc->gamma_lut) {
drmModeDestroyPropertyBlob(drm->fd, crtc->gamma_lut);
}
free(crtc->gamma_table);
if (crtc->primary) {
wlr_drm_format_set_finish(&crtc->primary->formats);
free(crtc->primary);
}
if (crtc->cursor) {
wlr_drm_format_set_finish(&crtc->cursor->formats);
free(crtc->cursor);
}
free(crtc->overlays);
}
free(drm->crtcs);
free(drm->planes);
}
static struct wlr_drm_connector *get_drm_connector_from_output(
@ -477,7 +514,7 @@ static void drm_connector_start_renderer(struct wlr_drm_connector *conn) {
}
}
static void realloc_crtcs(struct wlr_drm_backend *drm, bool *changed_outputs);
static void realloc_crtcs(struct wlr_drm_backend *drm);
static void attempt_enable_needs_modeset(struct wlr_drm_backend *drm) {
// Try to modeset any output that has a desired mode and a CRTC (ie. was
@ -506,7 +543,7 @@ bool enable_drm_connector(struct wlr_output *output, bool enable) {
if (enable && conn->crtc == NULL) {
// Maybe we can steal a CRTC from a disabled output
realloc_crtcs(drm, NULL);
realloc_crtcs(drm);
}
bool ok = drm->iface->conn_enable(drm, conn, enable);
@ -517,7 +554,7 @@ bool enable_drm_connector(struct wlr_output *output, bool enable) {
if (enable) {
drm_connector_start_renderer(conn);
} else {
realloc_crtcs(drm, NULL);
realloc_crtcs(drm);
attempt_enable_needs_modeset(drm);
}
@ -526,82 +563,6 @@ bool enable_drm_connector(struct wlr_output *output, bool enable) {
return true;
}
static ssize_t connector_index_from_crtc(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc) {
size_t i = 0;
struct wlr_drm_connector *conn;
wl_list_for_each(conn, &drm->outputs, link) {
if (conn->crtc == crtc) {
return i;
}
++i;
}
return -1;
}
static void realloc_planes(struct wlr_drm_backend *drm, const uint32_t *crtc_in,
bool *changed_outputs) {
wlr_log(WLR_DEBUG, "Reallocating planes");
// overlay, primary, cursor
for (size_t type = 0; type < 3; ++type) {
if (drm->num_type_planes[type] == 0) {
continue;
}
uint32_t possible[drm->num_type_planes[type] + 1];
uint32_t crtc[drm->num_crtcs + 1];
uint32_t crtc_res[drm->num_crtcs + 1];
for (size_t i = 0; i < drm->num_type_planes[type]; ++i) {
possible[i] = drm->type_planes[type][i].possible_crtcs;
}
for (size_t i = 0; i < drm->num_crtcs; ++i) {
if (crtc_in[i] == UNMATCHED) {
crtc[i] = SKIP;
} else if (drm->crtcs[i].planes[type]) {
crtc[i] = drm->crtcs[i].planes[type]
- drm->type_planes[type];
} else {
crtc[i] = UNMATCHED;
}
}
match_obj(drm->num_type_planes[type], possible,
drm->num_crtcs, crtc, crtc_res);
for (size_t i = 0; i < drm->num_crtcs; ++i) {
if (crtc_res[i] == UNMATCHED || crtc_res[i] == SKIP) {
continue;
}
struct wlr_drm_crtc *c = &drm->crtcs[i];
struct wlr_drm_plane **old = &c->planes[type];
struct wlr_drm_plane *new = &drm->type_planes[type][crtc_res[i]];
if (*old != new) {
wlr_log(WLR_DEBUG,
"Assigning plane %d -> %d (type %zu) to CRTC %d",
*old ? (int)(*old)->id : -1,
new ? (int)new->id : -1,
type,
c->id);
ssize_t conn_idx = connector_index_from_crtc(drm, c);
if (conn_idx >= 0) {
changed_outputs[conn_idx] = true;
}
if (*old) {
finish_drm_surface(&(*old)->surf);
}
finish_drm_surface(&new->surf);
*old = new;
}
}
}
}
static void drm_connector_cleanup(struct wlr_drm_connector *conn);
bool drm_connector_set_mode(struct wlr_output *output,
@ -610,7 +571,7 @@ bool drm_connector_set_mode(struct wlr_output *output,
struct wlr_drm_backend *drm = get_drm_backend_from_backend(output->backend);
if (conn->crtc == NULL) {
// Maybe we can steal a CRTC from a disabled output
realloc_crtcs(drm, NULL);
realloc_crtcs(drm);
}
if (conn->crtc == NULL) {
wlr_log(WLR_ERROR, "Cannot modeset '%s': no CRTC for this connector",
@ -1001,51 +962,37 @@ static void dealloc_crtc(struct wlr_drm_connector *conn) {
conn->crtc - drm->crtcs, conn->output.name);
set_drm_connector_gamma(&conn->output, 0, NULL, NULL, NULL);
for (size_t type = 0; type < 3; ++type) {
struct wlr_drm_plane *plane = conn->crtc->planes[type];
if (plane == NULL) {
continue;
}
finish_drm_surface(&plane->surf);
conn->crtc->planes[type] = NULL;
}
finish_drm_surface(&conn->crtc->primary->surf);
finish_drm_surface(&conn->crtc->cursor->surf);
drm->iface->conn_enable(drm, conn, false);
conn->crtc = NULL;
}
static void realloc_crtcs(struct wlr_drm_backend *drm, bool *changed_outputs) {
size_t num_outputs = wl_list_length(&drm->outputs);
bool changed_local = changed_outputs ? false : true;
static void realloc_crtcs(struct wlr_drm_backend *drm) {
assert(drm->num_crtcs > 0);
if (changed_local) {
changed_outputs = calloc(num_outputs, sizeof(bool));
if (changed_outputs == NULL) {
wlr_log(WLR_ERROR, "Allocation failed");
size_t num_outputs = wl_list_length(&drm->outputs);
if (num_outputs == 0) {
return;
}
}
wlr_log(WLR_DEBUG, "Reallocating CRTCs");
uint32_t crtc[drm->num_crtcs + 1];
struct wlr_drm_connector *connectors[num_outputs];
uint32_t connector_constraints[num_outputs];
uint32_t previous_match[drm->num_crtcs];
uint32_t new_match[drm->num_crtcs];
for (size_t i = 0; i < drm->num_crtcs; ++i) {
crtc[i] = UNMATCHED;
previous_match[i] = UNMATCHED;
}
struct wlr_drm_connector *connectors[num_outputs + 1];
uint32_t possible_crtc[num_outputs + 1];
memset(possible_crtc, 0, sizeof(possible_crtc));
wlr_log(WLR_DEBUG, "State before reallocation:");
ssize_t i = -1;
size_t i = 0;
struct wlr_drm_connector *conn;
wl_list_for_each(conn, &drm->outputs, link) {
i++;
connectors[i] = conn;
wlr_log(WLR_DEBUG, " '%s' crtc=%d state=%d desired_enabled=%d",
@ -1054,7 +1001,7 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, bool *changed_outputs) {
conn->state, conn->desired_enabled);
if (conn->crtc) {
crtc[conn->crtc - drm->crtcs] = i;
previous_match[conn->crtc - drm->crtcs] = i;
}
// Only search CRTCs for user-enabled outputs (that are already
@ -1062,86 +1009,84 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, bool *changed_outputs) {
if ((conn->state == WLR_DRM_CONN_CONNECTED ||
conn->state == WLR_DRM_CONN_NEEDS_MODESET) &&
conn->desired_enabled) {
possible_crtc[i] = conn->possible_crtc;
}
connector_constraints[i] = conn->possible_crtc;
} else {
// Will always fail to match anything
connector_constraints[i] = 0;
}
uint32_t crtc_res[drm->num_crtcs + 1];
match_obj(wl_list_length(&drm->outputs), possible_crtc,
drm->num_crtcs, crtc, crtc_res);
bool matched[num_outputs + 1];
memset(matched, false, sizeof(matched));
for (size_t i = 0; i < drm->num_crtcs; ++i) {
if (crtc_res[i] != UNMATCHED) {
matched[crtc_res[i]] = true;
}
++i;
}
for (size_t i = 0; i < drm->num_crtcs; ++i) {
// We don't want any of the current monitors to be deactivated
if (crtc[i] != UNMATCHED && !matched[crtc[i]] &&
connectors[crtc[i]]->desired_enabled) {
wlr_log(WLR_DEBUG, "Could not match a CRTC for connected output %d",
crtc[i]);
goto free_changed_outputs;
}
}
match_obj(num_outputs, connector_constraints,
drm->num_crtcs, previous_match, new_match);
// Converts our crtc=>connector result into a connector=>crtc one.
ssize_t connector_match[num_outputs];
for (size_t i = 0 ; i < num_outputs; ++i) {
connector_match[i] = -1;
}
for (size_t i = 0; i < drm->num_crtcs; ++i) {
if (crtc_res[i] == crtc[i]) {
continue;
if (new_match[i] != UNMATCHED) {
connector_match[new_match[i]] = i;
}
}
/*
* In the case that we add a new connector (hotplug) and we fail to
* match everything, we prefer to fail the new connector and keep all
* of the old mappings instead.
*/
for (size_t i = 0; i < num_outputs; ++i) {
struct wlr_drm_connector *conn = connectors[i];
if (conn->state == WLR_DRM_CONN_CONNECTED &&
conn->desired_enabled &&
connector_match[i] == -1) {
wlr_log(WLR_DEBUG, "Could not match a CRTC for previously connected output; "
"keeping old configuration");
return;
}
// De-allocate this CRTC on previous output
if (crtc[i] != UNMATCHED) {
changed_outputs[crtc[i]] = true;
dealloc_crtc(connectors[crtc[i]]);
}
wlr_log(WLR_DEBUG, "State after reallocation:");
// Assign this CRTC to next output
if (crtc_res[i] != UNMATCHED) {
changed_outputs[crtc_res[i]] = true;
struct wlr_drm_connector *conn = connectors[crtc_res[i]];
dealloc_crtc(conn);
conn->crtc = &drm->crtcs[i];
wlr_log(WLR_DEBUG, "Assigning CRTC %zu to output %d -> %d '%s'",
i, crtc[i], crtc_res[i], conn->output.name);
}
}
// Apply new configuration
for (size_t i = 0; i < num_outputs; ++i) {
struct wlr_drm_connector *conn = connectors[i];
bool prev_enabled = conn->crtc;
wlr_log(WLR_DEBUG, "State after reallocation:");
wl_list_for_each(conn, &drm->outputs, link) {
wlr_log(WLR_DEBUG, " '%s' crtc=%d state=%d desired_enabled=%d",
wlr_log(WLR_DEBUG, " '%s' crtc=%zd state=%d desired_enabled=%d",
conn->output.name,
conn->crtc ? (int)(conn->crtc - drm->crtcs) : -1,
connector_match[i],
conn->state, conn->desired_enabled);
}
realloc_planes(drm, crtc_res, changed_outputs);
// We need to reinitialize any plane that has changed
i = -1;
wl_list_for_each(conn, &drm->outputs, link) {
i++;
struct wlr_output_mode *mode = conn->output.current_mode;
if (conn->state != WLR_DRM_CONN_CONNECTED || !changed_outputs[i]) {
// We don't need to change anything.
if (prev_enabled && connector_match[i] == conn->crtc - drm->crtcs) {
continue;
}
if (conn->crtc == NULL) {
dealloc_crtc(conn);
if (connector_match[i] == -1) {
if (prev_enabled) {
wlr_log(WLR_DEBUG, "Output has %s lost its CRTC",
conn->output.name);
conn->state = WLR_DRM_CONN_NEEDS_MODESET;
wlr_output_update_enabled(&conn->output, false);
conn->desired_mode = conn->output.current_mode;
wlr_output_update_mode(&conn->output, NULL);
}
continue;
}
conn->crtc = &drm->crtcs[connector_match[i]];
// Only realloc buffers if we have actually been modeset
if (conn->state != WLR_DRM_CONN_CONNECTED) {
continue;
}
struct wlr_output_mode *mode = conn->output.current_mode;
if (!init_drm_plane_surfaces(conn->crtc->primary, drm,
mode->width, mode->height, drm->renderer.gbm_format)) {
wlr_log(WLR_ERROR, "Failed to initialize renderer for plane");
@ -1153,11 +1098,6 @@ static void realloc_crtcs(struct wlr_drm_backend *drm, bool *changed_outputs) {
wlr_output_damage_whole(&conn->output);
}
free_changed_outputs:
if (changed_local) {
free(changed_outputs);
}
}
static uint32_t get_possible_crtcs(int fd, drmModeRes *res,
@ -1392,25 +1332,7 @@ void scan_drm_connectors(struct wlr_drm_backend *drm) {
}
}
bool changed_outputs[wl_list_length(&drm->outputs) + 1];
memset(changed_outputs, false, sizeof(changed_outputs));
for (size_t i = 0; i < new_outputs_len; ++i) {
struct wlr_drm_connector *conn = new_outputs[i];
ssize_t pos = -1;
struct wlr_drm_connector *c;
wl_list_for_each(c, &drm->outputs, link) {
++pos;
if (c == conn) {
break;
}
}
assert(pos >= 0);
changed_outputs[pos] = true;
}
realloc_crtcs(drm, changed_outputs);
realloc_crtcs(drm);
for (size_t i = 0; i < new_outputs_len; ++i) {
struct wlr_drm_connector *conn = new_outputs[i];
@ -1536,23 +1458,7 @@ static void drm_connector_cleanup(struct wlr_drm_connector *conn) {
switch (conn->state) {
case WLR_DRM_CONN_CONNECTED:
case WLR_DRM_CONN_CLEANUP:;
struct wlr_drm_crtc *crtc = conn->crtc;
if (crtc != NULL) {
for (int i = 0; i < 3; ++i) {
if (!crtc->planes[i]) {
continue;
}
finish_drm_surface(&crtc->planes[i]->surf);
finish_drm_surface(&crtc->planes[i]->mgpu_surf);
if (crtc->planes[i]->id == 0) {
free(crtc->planes[i]);
crtc->planes[i] = NULL;
}
}
}
case WLR_DRM_CONN_CLEANUP:
conn->output.current_mode = NULL;
conn->desired_mode = NULL;
struct wlr_drm_mode *mode, *tmp;

35
include/backend/drm/drm.h
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@ -22,8 +22,6 @@ struct wlr_drm_plane {
uint32_t type;
uint32_t id;
uint32_t possible_crtcs;
struct wlr_drm_surface surf;
struct wlr_drm_surface mgpu_surf;
@ -49,14 +47,15 @@ struct wlr_drm_crtc {
// Legacy only
drmModeCrtc *legacy_crtc;
union {
struct {
struct wlr_drm_plane *overlay;
struct wlr_drm_plane *primary;
struct wlr_drm_plane *cursor;
};
struct wlr_drm_plane *planes[3];
};
/*
* We don't support overlay planes yet, but we keep track of them to
* give to DRM lease clients.
*/
size_t num_overlays;
uint32_t *overlays;
union wlr_drm_crtc_props props;
@ -78,26 +77,6 @@ struct wlr_drm_backend {
size_t num_crtcs;
struct wlr_drm_crtc *crtcs;
size_t num_planes;
struct wlr_drm_plane *planes;
union {
struct {
size_t num_overlay_planes;
size_t num_primary_planes;
size_t num_cursor_planes;
};
size_t num_type_planes[3];
};
union {
struct {
struct wlr_drm_plane *overlay_planes;
struct wlr_drm_plane *primary_planes;
struct wlr_drm_plane *cursor_planes;
};
struct wlr_drm_plane *type_planes[3];
};
struct wl_display *display;
struct wl_event_source *drm_event;

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