glamor: Add support for DRI3.
The render-nodes case is untested. v2: Add a flag for wayland to suppress the native DRI3 support. Wayland isn't running as a master itself, so it can't do the auth on its own and has to ask the compositor to do it for us. Dropped XXX about randr provider -- the conclusion from discussion with keithp was that if the driver's dri3_open for a provider on a different screen, that's a core dri3 bug. v3: Don't put quite so much under GLAMOR_NO_DRI3, and add a comment explaining what this is about. Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Adam Jackson <ajax@redhat.com>
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@ -67,10 +67,12 @@ typedef enum glamor_pixmap_type {
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#define GLAMOR_USE_SCREEN (1 << 1)
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#define GLAMOR_USE_PICTURE_SCREEN (1 << 2)
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#define GLAMOR_USE_EGL_SCREEN (1 << 3)
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#define GLAMOR_NO_DRI3 (1 << 4)
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#define GLAMOR_VALID_FLAGS (GLAMOR_INVERTED_Y_AXIS \
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| GLAMOR_USE_SCREEN \
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| GLAMOR_USE_PICTURE_SCREEN \
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| GLAMOR_USE_EGL_SCREEN)
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| GLAMOR_USE_EGL_SCREEN \
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| GLAMOR_NO_DRI3)
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/* @glamor_init: Initialize glamor internal data structure.
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*
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@ -50,6 +50,7 @@
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#include "glamor.h"
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#include "glamor_priv.h"
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#include "dri3.h"
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static const char glamor_name[] = "glamor";
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@ -68,6 +69,7 @@ struct glamor_egl_screen_private {
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EGLDisplay display;
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EGLContext context;
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EGLint major, minor;
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char *device_path;
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CreateScreenResourcesProcPtr CreateScreenResources;
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CloseScreenProcPtr CloseScreen;
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@ -627,10 +629,67 @@ glamor_egl_has_extension(struct glamor_egl_screen_private *glamor_egl,
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return FALSE;
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}
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static int
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glamor_dri3_open(ScreenPtr screen,
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RRProviderPtr provider,
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int *fdp)
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{
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ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
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struct glamor_egl_screen_private *glamor_egl =
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glamor_egl_get_screen_private(scrn);
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int fd;
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drm_magic_t magic;
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fd = open(glamor_egl->device_path, O_RDWR|O_CLOEXEC);
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if (fd < 0)
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return BadAlloc;
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/* Before FD passing in the X protocol with DRI3 (and increased
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* security of rendering with per-process address spaces on the
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* GPU), the kernel had to come up with a way to have the server
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* decide which clients got to access the GPU, which was done by
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* each client getting a unique (magic) number from the kernel,
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* passing it to the server, and the server then telling the
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* kernel which clients were authenticated for using the device.
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*
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* Now that we have FD passing, the server can just set up the
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* authentication on its own and hand the prepared FD off to the
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* client.
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*/
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if (drmGetMagic(fd, &magic) < 0) {
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if (errno == EACCES) {
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/* Assume that we're on a render node, and the fd is
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* already as authenticated as it should be.
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*/
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*fdp = fd;
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return Success;
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} else {
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close(fd);
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return BadMatch;
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}
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}
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if (drmAuthMagic(glamor_egl->fd, magic) < 0) {
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close(fd);
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return BadMatch;
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}
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*fdp = fd;
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return Success;
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}
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static dri3_screen_info_rec glamor_dri3_info = {
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.version = 0,
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.open = glamor_dri3_open,
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.pixmap_from_fd = glamor_pixmap_from_fd,
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.fd_from_pixmap = glamor_fd_from_pixmap,
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};
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void
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glamor_egl_screen_init(ScreenPtr screen, struct glamor_context *glamor_ctx)
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{
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ScrnInfoPtr scrn = xf86ScreenToScrn(screen);
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glamor_screen_private *glamor_priv = glamor_get_screen_private(screen);
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struct glamor_egl_screen_private *glamor_egl =
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glamor_egl_get_screen_private(scrn);
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@ -642,6 +701,30 @@ glamor_egl_screen_init(ScreenPtr screen, struct glamor_context *glamor_ctx)
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glamor_ctx->get_context = glamor_egl_get_context;
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glamor_ctx->put_context = glamor_egl_put_context;
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if (glamor_egl->dri3_capable) {
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/* Tell the core that we have the interfaces for import/export
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* of pixmaps.
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*/
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glamor_enable_dri3(screen);
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/* If the driver wants to do its own auth dance (e.g. Xwayland
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* on pre-3.15 kernels that don't have render nodes and thus
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* has the wayland compositor as a master), then it needs us
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* to stay out of the way and let it init DRI3 on its own.
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*/
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if (!(glamor_priv->flags & GLAMOR_NO_DRI3)) {
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/* To do DRI3 device FD generation, we need to open a new fd
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* to the same device we were handed in originally.
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*/
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glamor_egl->device_path = drmGetDeviceNameFromFd(glamor_egl->fd);
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if (!dri3_screen_init(screen, &glamor_dri3_info)) {
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xf86DrvMsg(scrn->scrnIndex, X_ERROR,
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"Failed to initialize DRI3.\n");
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}
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}
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}
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}
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static void
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@ -658,6 +741,8 @@ glamor_egl_free_screen(ScrnInfoPtr scrn)
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if (glamor_egl->gbm)
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gbm_device_destroy(glamor_egl->gbm);
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#endif
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free(glamor_egl->device_path);
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scrn->FreeScreen = glamor_egl->saved_free_screen;
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free(glamor_egl);
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scrn->FreeScreen(scrn);
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@ -36,5 +36,8 @@ libglamoregl_la_LIBADD = \
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$(top_builddir)/glamor/libglamor.la \
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$()
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AM_CPPFLAGS = $(XORG_INCS)
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AM_CPPFLAGS = $(XORG_INCS) \
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-I$(top_srcdir)/dri3 \
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$()
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AM_CFLAGS = $(DIX_CFLAGS) $(XORG_CFLAGS) $(GLAMOR_CFLAGS) $(GBM_CFLAGS)
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