| Message ID | 20161114085703.16540-14-chris@chris-wilson.co.uk (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi Chris, I'm not sure you are waiting for this kind of feedback, but I've managed to test this particular patch with Mesa, and I have some piglit tests for it too. They are waiting for review, but at least the feature is working as expected: https://github.com/rantogno/piglit/commits/review/fences-v02 I used mesa and libdrm patches from more than a single set, but in case you want to look they are here: https://github.com/rantogno/mesa/commits/wip-fence https://github.com/rantogno/libdrm/commits/wip-fence And my kernel tree when I tested it: https://github.com/rantogno/linux/commits/wip-fence So in case it helps, you can add a Tested-by: Rafael Antognolli <rafael.antognolli@intel.com> PS: I can test it with this last series and everything more up to date, if it will help to get this patch landed sooner. Cheers, Rafael On Mon, Nov 14, 2016 at 08:57:03AM +0000, Chris Wilson wrote: > Now that the user can opt-out of implicit fencing, we need to give them > back control over the fencing. We employ sync_file to wrap our > drm_i915_gem_request and provide an fd that userspace can merge with > other sync_file fds and pass back to the kernel to wait upon before > future execution. > > Testcase: igt/gem_exec_fence > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> > Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> > --- > drivers/gpu/drm/i915/Kconfig | 1 + > drivers/gpu/drm/i915/i915_drv.c | 3 +- > drivers/gpu/drm/i915/i915_gem_execbuffer.c | 54 +++++++++++++++++++++++++++--- > include/uapi/drm/i915_drm.h | 35 ++++++++++++++++++- > 4 files changed, 86 insertions(+), 7 deletions(-) > > diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig > index beed5c1d2cd7..bed81fe1d2a7 100644 > --- a/drivers/gpu/drm/i915/Kconfig > +++ b/drivers/gpu/drm/i915/Kconfig > @@ -19,6 +19,7 @@ config DRM_I915 > select INPUT if ACPI > select ACPI_VIDEO if ACPI > select ACPI_BUTTON if ACPI > + select SYNC_FILE > help > Choose this option if you have a system that has "Intel Graphics > Media Accelerator" or "HD Graphics" integrated graphics, > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c > index 657c465a8d50..6fe7f41a5b5b 100644 > --- a/drivers/gpu/drm/i915/i915_drv.c > +++ b/drivers/gpu/drm/i915/i915_drv.c > @@ -344,6 +344,7 @@ static int i915_getparam(struct drm_device *dev, void *data, > case I915_PARAM_HAS_COHERENT_PHYS_GTT: > case I915_PARAM_HAS_EXEC_SOFTPIN: > case I915_PARAM_HAS_EXEC_ASYNC: > + case I915_PARAM_HAS_EXEC_FENCE: > /* For the time being all of these are always true; > * if some supported hardware does not have one of these > * features this value needs to be provided from > @@ -2533,7 +2534,7 @@ static const struct drm_ioctl_desc i915_ioctls[] = { > DRM_IOCTL_DEF_DRV(I915_HWS_ADDR, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), > DRM_IOCTL_DEF_DRV(I915_GEM_INIT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), > DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER, i915_gem_execbuffer, DRM_AUTH), > - DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2, i915_gem_execbuffer2, DRM_AUTH|DRM_RENDER_ALLOW), > + DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2_WR, i915_gem_execbuffer2, DRM_AUTH|DRM_RENDER_ALLOW), > DRM_IOCTL_DEF_DRV(I915_GEM_PIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY), > DRM_IOCTL_DEF_DRV(I915_GEM_UNPIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY), > DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH|DRM_RENDER_ALLOW), > diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c > index 781b5559f86e..facec610b55a 100644 > --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c > +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c > @@ -28,6 +28,7 @@ > > #include <linux/dma_remapping.h> > #include <linux/reservation.h> > +#include <linux/sync_file.h> > #include <linux/uaccess.h> > > #include <drm/drmP.h> > @@ -1597,6 +1598,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, > struct i915_execbuffer_params *params = ¶ms_master; > const u32 ctx_id = i915_execbuffer2_get_context_id(*args); > u32 dispatch_flags; > + struct dma_fence *in_fence = NULL; > + struct sync_file *out_fence = NULL; > + int out_fence_fd = -1; > int ret; > bool need_relocs; > > @@ -1640,6 +1644,23 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, > dispatch_flags |= I915_DISPATCH_RS; > } > > + if (args->flags & I915_EXEC_FENCE_IN) { > + in_fence = sync_file_get_fence(lower_32_bits(args->rsvd2)); > + if (!in_fence) { > + ret = -EINVAL; > + goto pre_mutex_err; > + } > + } > + > + if (args->flags & I915_EXEC_FENCE_OUT) { > + out_fence_fd = get_unused_fd_flags(O_CLOEXEC); > + if (out_fence_fd < 0) { > + ret = out_fence_fd; > + out_fence_fd = -1; > + goto pre_mutex_err; > + } > + } > + > /* Take a local wakeref for preparing to dispatch the execbuf as > * we expect to access the hardware fairly frequently in the > * process. Upon first dispatch, we acquire another prolonged > @@ -1784,6 +1805,21 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, > goto err_batch_unpin; > } > > + if (in_fence) { > + ret = i915_gem_request_await_dma_fence(params->request, > + in_fence); > + if (ret < 0) > + goto err_request; > + } > + > + if (out_fence_fd != -1) { > + out_fence = sync_file_create(¶ms->request->fence); > + if (!out_fence) { > + ret = -ENOMEM; > + goto err_request; > + } > + } > + > /* Whilst this request exists, batch_obj will be on the > * active_list, and so will hold the active reference. Only when this > * request is retired will the the batch_obj be moved onto the > @@ -1811,6 +1847,16 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, > ret = execbuf_submit(params, args, &eb->vmas); > err_request: > __i915_add_request(params->request, ret == 0); > + if (out_fence) { > + if (ret == 0) { > + fd_install(out_fence_fd, out_fence->file); > + args->rsvd2 &= GENMASK_ULL(0, 31); /* keep in-fence */ > + args->rsvd2 |= (u64)out_fence_fd << 32; > + out_fence_fd = -1; > + } else { > + fput(out_fence->file); > + } > + } > > err_batch_unpin: > /* > @@ -1832,6 +1878,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, > /* intel_gpu_busy should also get a ref, so it will free when the device > * is really idle. */ > intel_runtime_pm_put(dev_priv); > + if (out_fence_fd != -1) > + put_unused_fd(out_fence_fd); > + dma_fence_put(in_fence); > return ret; > } > > @@ -1939,11 +1988,6 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data, > return -EINVAL; > } > > - if (args->rsvd2 != 0) { > - DRM_DEBUG("dirty rvsd2 field\n"); > - return -EINVAL; > - } > - > exec2_list = drm_malloc_gfp(args->buffer_count, > sizeof(*exec2_list), > GFP_TEMPORARY); > diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h > index 4bd83c0b07db..90082269fb50 100644 > --- a/include/uapi/drm/i915_drm.h > +++ b/include/uapi/drm/i915_drm.h > @@ -246,6 +246,7 @@ typedef struct _drm_i915_sarea { > #define DRM_I915_OVERLAY_PUT_IMAGE 0x27 > #define DRM_I915_OVERLAY_ATTRS 0x28 > #define DRM_I915_GEM_EXECBUFFER2 0x29 > +#define DRM_I915_GEM_EXECBUFFER2_WR DRM_I915_GEM_EXECBUFFER2 > #define DRM_I915_GET_SPRITE_COLORKEY 0x2a > #define DRM_I915_SET_SPRITE_COLORKEY 0x2b > #define DRM_I915_GEM_WAIT 0x2c > @@ -279,6 +280,7 @@ typedef struct _drm_i915_sarea { > #define DRM_IOCTL_I915_GEM_INIT DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_INIT, struct drm_i915_gem_init) > #define DRM_IOCTL_I915_GEM_EXECBUFFER DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER, struct drm_i915_gem_execbuffer) > #define DRM_IOCTL_I915_GEM_EXECBUFFER2 DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2, struct drm_i915_gem_execbuffer2) > +#define DRM_IOCTL_I915_GEM_EXECBUFFER2_WR DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2_WR, struct drm_i915_gem_execbuffer2) > #define DRM_IOCTL_I915_GEM_PIN DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_PIN, struct drm_i915_gem_pin) > #define DRM_IOCTL_I915_GEM_UNPIN DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_UNPIN, struct drm_i915_gem_unpin) > #define DRM_IOCTL_I915_GEM_BUSY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_BUSY, struct drm_i915_gem_busy) > @@ -401,6 +403,12 @@ typedef struct drm_i915_irq_wait { > */ > #define I915_PARAM_HAS_EXEC_ASYNC 42 > > +/* Query whether DRM_I915_GEM_EXECBUFFER2 supports explicit fence support - > + * both being able to pass in a sync_file fd to wait upon before executing, > + * and being able to return a new sync_file fd that is signaled when the > + * current request is complete. > + */ > +#define I915_PARAM_HAS_EXEC_FENCE 43 > > typedef struct drm_i915_getparam { > __s32 param; > @@ -854,7 +862,32 @@ struct drm_i915_gem_execbuffer2 { > */ > #define I915_EXEC_RESOURCE_STREAMER (1<<15) > > -#define __I915_EXEC_UNKNOWN_FLAGS -(I915_EXEC_RESOURCE_STREAMER<<1) > +/* Setting I915_EXEC_FENCE_IN implies that lower_32_bits(rsvd2) represent > + * a sync_file fd to wait upon (in a nonblocking manner) prior to executing > + * the batch. > + * > + * Returns -EINVAL if the sync_file fd cannot be found. > + */ > +#define I915_EXEC_FENCE_IN (1<<16) > + > +/* Setting I915_EXEC_FENCE_OUT causes the ioctl to return a sync_file fd > + * in the upper_32_bits(rsvd2) upon success. Ownership of the fd is given > + * to the caller, and it should be close() after use. (The fd is a regular > + * file descriptor and will be cleaned up on process termination. It holds > + * a reference to the request, but nothing else.) > + * > + * The sync_file fd can be combined with other sync_file and passed either > + * to execbuf using I915_EXEC_FENCE_IN, to atomic KMS ioctls (so that a flip > + * will only occur after this request completes), or to other devices. > + * > + * Using I915_EXEC_FENCE_OUT requires use of > + * DRM_IOCTL_I915_GEM_EXECBUFFER2_WR ioctl so that the result is written > + * back to userspace. Failure to do so will cause the out-fence to always > + * be reported as zero, and the real fence fd to be leaked. > + */ > +#define I915_EXEC_FENCE_OUT (1<<17) > + > +#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_OUT<<1)) > > #define I915_EXEC_CONTEXT_ID_MASK (0xffffffff) > #define i915_execbuffer2_set_context_id(eb2, context) \ > -- > 2.10.2 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
If I understand correctly, this patch preserves the kernel's current implicit fencing, even when an input fence fd is given to execbuffer. I'm convinced that's the right approach. If userspace does want to disable the implicit fencing during an execbuffer, then it should disable that explicit fencing through an *explicit* knob. I believe the kernel should not interpret the presence of an in fence fd in execbuffer as that knob. If it did, then using this feature from GL/EGL userspace would be unwieldy. In other words, I like this. Patch 14 gets my Acked-by: Chad Versace <chadversary@chromium.org> On Mon 14 Nov 2016, Chris Wilson wrote: > Now that the user can opt-out of implicit fencing, we need to give them > back control over the fencing. We employ sync_file to wrap our > drm_i915_gem_request and provide an fd that userspace can merge with > other sync_file fds and pass back to the kernel to wait upon before > future execution. > > Testcase: igt/gem_exec_fence > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> > Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> > --- > drivers/gpu/drm/i915/Kconfig | 1 + > drivers/gpu/drm/i915/i915_drv.c | 3 +- > drivers/gpu/drm/i915/i915_gem_execbuffer.c | 54 +++++++++++++++++++++++++++--- > include/uapi/drm/i915_drm.h | 35 ++++++++++++++++++- > 4 files changed, 86 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index beed5c1d2cd7..bed81fe1d2a7 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -19,6 +19,7 @@ config DRM_I915 select INPUT if ACPI select ACPI_VIDEO if ACPI select ACPI_BUTTON if ACPI + select SYNC_FILE help Choose this option if you have a system that has "Intel Graphics Media Accelerator" or "HD Graphics" integrated graphics, diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c index 657c465a8d50..6fe7f41a5b5b 100644 --- a/drivers/gpu/drm/i915/i915_drv.c +++ b/drivers/gpu/drm/i915/i915_drv.c @@ -344,6 +344,7 @@ static int i915_getparam(struct drm_device *dev, void *data, case I915_PARAM_HAS_COHERENT_PHYS_GTT: case I915_PARAM_HAS_EXEC_SOFTPIN: case I915_PARAM_HAS_EXEC_ASYNC: + case I915_PARAM_HAS_EXEC_FENCE: /* For the time being all of these are always true; * if some supported hardware does not have one of these * features this value needs to be provided from @@ -2533,7 +2534,7 @@ static const struct drm_ioctl_desc i915_ioctls[] = { DRM_IOCTL_DEF_DRV(I915_HWS_ADDR, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF_DRV(I915_GEM_INIT, drm_noop, DRM_AUTH|DRM_MASTER|DRM_ROOT_ONLY), DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER, i915_gem_execbuffer, DRM_AUTH), - DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2, i915_gem_execbuffer2, DRM_AUTH|DRM_RENDER_ALLOW), + DRM_IOCTL_DEF_DRV(I915_GEM_EXECBUFFER2_WR, i915_gem_execbuffer2, DRM_AUTH|DRM_RENDER_ALLOW), DRM_IOCTL_DEF_DRV(I915_GEM_PIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY), DRM_IOCTL_DEF_DRV(I915_GEM_UNPIN, i915_gem_reject_pin_ioctl, DRM_AUTH|DRM_ROOT_ONLY), DRM_IOCTL_DEF_DRV(I915_GEM_BUSY, i915_gem_busy_ioctl, DRM_AUTH|DRM_RENDER_ALLOW), diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 781b5559f86e..facec610b55a 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -28,6 +28,7 @@ #include <linux/dma_remapping.h> #include <linux/reservation.h> +#include <linux/sync_file.h> #include <linux/uaccess.h> #include <drm/drmP.h> @@ -1597,6 +1598,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, struct i915_execbuffer_params *params = ¶ms_master; const u32 ctx_id = i915_execbuffer2_get_context_id(*args); u32 dispatch_flags; + struct dma_fence *in_fence = NULL; + struct sync_file *out_fence = NULL; + int out_fence_fd = -1; int ret; bool need_relocs; @@ -1640,6 +1644,23 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, dispatch_flags |= I915_DISPATCH_RS; } + if (args->flags & I915_EXEC_FENCE_IN) { + in_fence = sync_file_get_fence(lower_32_bits(args->rsvd2)); + if (!in_fence) { + ret = -EINVAL; + goto pre_mutex_err; + } + } + + if (args->flags & I915_EXEC_FENCE_OUT) { + out_fence_fd = get_unused_fd_flags(O_CLOEXEC); + if (out_fence_fd < 0) { + ret = out_fence_fd; + out_fence_fd = -1; + goto pre_mutex_err; + } + } + /* Take a local wakeref for preparing to dispatch the execbuf as * we expect to access the hardware fairly frequently in the * process. Upon first dispatch, we acquire another prolonged @@ -1784,6 +1805,21 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, goto err_batch_unpin; } + if (in_fence) { + ret = i915_gem_request_await_dma_fence(params->request, + in_fence); + if (ret < 0) + goto err_request; + } + + if (out_fence_fd != -1) { + out_fence = sync_file_create(¶ms->request->fence); + if (!out_fence) { + ret = -ENOMEM; + goto err_request; + } + } + /* Whilst this request exists, batch_obj will be on the * active_list, and so will hold the active reference. Only when this * request is retired will the the batch_obj be moved onto the @@ -1811,6 +1847,16 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, ret = execbuf_submit(params, args, &eb->vmas); err_request: __i915_add_request(params->request, ret == 0); + if (out_fence) { + if (ret == 0) { + fd_install(out_fence_fd, out_fence->file); + args->rsvd2 &= GENMASK_ULL(0, 31); /* keep in-fence */ + args->rsvd2 |= (u64)out_fence_fd << 32; + out_fence_fd = -1; + } else { + fput(out_fence->file); + } + } err_batch_unpin: /* @@ -1832,6 +1878,9 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data, /* intel_gpu_busy should also get a ref, so it will free when the device * is really idle. */ intel_runtime_pm_put(dev_priv); + if (out_fence_fd != -1) + put_unused_fd(out_fence_fd); + dma_fence_put(in_fence); return ret; } @@ -1939,11 +1988,6 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data, return -EINVAL; } - if (args->rsvd2 != 0) { - DRM_DEBUG("dirty rvsd2 field\n"); - return -EINVAL; - } - exec2_list = drm_malloc_gfp(args->buffer_count, sizeof(*exec2_list), GFP_TEMPORARY); diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h index 4bd83c0b07db..90082269fb50 100644 --- a/include/uapi/drm/i915_drm.h +++ b/include/uapi/drm/i915_drm.h @@ -246,6 +246,7 @@ typedef struct _drm_i915_sarea { #define DRM_I915_OVERLAY_PUT_IMAGE 0x27 #define DRM_I915_OVERLAY_ATTRS 0x28 #define DRM_I915_GEM_EXECBUFFER2 0x29 +#define DRM_I915_GEM_EXECBUFFER2_WR DRM_I915_GEM_EXECBUFFER2 #define DRM_I915_GET_SPRITE_COLORKEY 0x2a #define DRM_I915_SET_SPRITE_COLORKEY 0x2b #define DRM_I915_GEM_WAIT 0x2c @@ -279,6 +280,7 @@ typedef struct _drm_i915_sarea { #define DRM_IOCTL_I915_GEM_INIT DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_INIT, struct drm_i915_gem_init) #define DRM_IOCTL_I915_GEM_EXECBUFFER DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER, struct drm_i915_gem_execbuffer) #define DRM_IOCTL_I915_GEM_EXECBUFFER2 DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2, struct drm_i915_gem_execbuffer2) +#define DRM_IOCTL_I915_GEM_EXECBUFFER2_WR DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_EXECBUFFER2_WR, struct drm_i915_gem_execbuffer2) #define DRM_IOCTL_I915_GEM_PIN DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_PIN, struct drm_i915_gem_pin) #define DRM_IOCTL_I915_GEM_UNPIN DRM_IOW(DRM_COMMAND_BASE + DRM_I915_GEM_UNPIN, struct drm_i915_gem_unpin) #define DRM_IOCTL_I915_GEM_BUSY DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_GEM_BUSY, struct drm_i915_gem_busy) @@ -401,6 +403,12 @@ typedef struct drm_i915_irq_wait { */ #define I915_PARAM_HAS_EXEC_ASYNC 42 +/* Query whether DRM_I915_GEM_EXECBUFFER2 supports explicit fence support - + * both being able to pass in a sync_file fd to wait upon before executing, + * and being able to return a new sync_file fd that is signaled when the + * current request is complete. + */ +#define I915_PARAM_HAS_EXEC_FENCE 43 typedef struct drm_i915_getparam { __s32 param; @@ -854,7 +862,32 @@ struct drm_i915_gem_execbuffer2 { */ #define I915_EXEC_RESOURCE_STREAMER (1<<15) -#define __I915_EXEC_UNKNOWN_FLAGS -(I915_EXEC_RESOURCE_STREAMER<<1) +/* Setting I915_EXEC_FENCE_IN implies that lower_32_bits(rsvd2) represent + * a sync_file fd to wait upon (in a nonblocking manner) prior to executing + * the batch. + * + * Returns -EINVAL if the sync_file fd cannot be found. + */ +#define I915_EXEC_FENCE_IN (1<<16) + +/* Setting I915_EXEC_FENCE_OUT causes the ioctl to return a sync_file fd + * in the upper_32_bits(rsvd2) upon success. Ownership of the fd is given + * to the caller, and it should be close() after use. (The fd is a regular + * file descriptor and will be cleaned up on process termination. It holds + * a reference to the request, but nothing else.) + * + * The sync_file fd can be combined with other sync_file and passed either + * to execbuf using I915_EXEC_FENCE_IN, to atomic KMS ioctls (so that a flip + * will only occur after this request completes), or to other devices. + * + * Using I915_EXEC_FENCE_OUT requires use of + * DRM_IOCTL_I915_GEM_EXECBUFFER2_WR ioctl so that the result is written + * back to userspace. Failure to do so will cause the out-fence to always + * be reported as zero, and the real fence fd to be leaked. + */ +#define I915_EXEC_FENCE_OUT (1<<17) + +#define __I915_EXEC_UNKNOWN_FLAGS (-(I915_EXEC_FENCE_OUT<<1)) #define I915_EXEC_CONTEXT_ID_MASK (0xffffffff) #define i915_execbuffer2_set_context_id(eb2, context) \