On Fri, May 18, 2018 at 08:19:55PM +0300, Dmitry Osipenko wrote:
> On 17.05.2018 18:41, Thierry Reding wrote:
> > From: Thierry Reding <tred...@nvidia.com>
> >
> > Document the userspace ABI with kerneldoc to provide some information on
> > how to use it.
> >
> > Signed-off-by: Thierry Reding <tred...@nvidia.com>
> > ---
> > drivers/gpu/drm/tegra/gem.c | 4 +-
> > include/uapi/drm/tegra_drm.h | 480 ++++++++++++++++++++++++++++++++++-
> > 2 files changed, 468 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/tegra/gem.c b/drivers/gpu/drm/tegra/gem.c
> > index 387ba1dfbe0d..e2987a19541d 100644
> > --- a/drivers/gpu/drm/tegra/gem.c
> > +++ b/drivers/gpu/drm/tegra/gem.c
> > @@ -291,10 +291,10 @@ struct tegra_bo *tegra_bo_create(struct drm_device
> > *drm, size_t size,
> > if (err < 0)
> > goto release;
> >
> > - if (flags & DRM_TEGRA_GEM_CREATE_TILED)
> > + if (flags & DRM_TEGRA_GEM_TILED)
> > bo->tiling.mode = TEGRA_BO_TILING_MODE_TILED;
> >
> > - if (flags & DRM_TEGRA_GEM_CREATE_BOTTOM_UP)
> > + if (flags & DRM_TEGRA_GEM_BOTTOM_UP)
> > bo->flags |= TEGRA_BO_BOTTOM_UP;
> >
> > return bo;
> > diff --git a/include/uapi/drm/tegra_drm.h b/include/uapi/drm/tegra_drm.h
> > index 99e15d82d1e9..86a7b1e7559d 100644
> > --- a/include/uapi/drm/tegra_drm.h
> > +++ b/include/uapi/drm/tegra_drm.h
> > @@ -29,146 +29,598 @@
> > extern "C" {
> > #endif
> >
> > -#define DRM_TEGRA_GEM_CREATE_TILED (1 << 0)
> > -#define DRM_TEGRA_GEM_CREATE_BOTTOM_UP (1 << 1)
> > +#define DRM_TEGRA_GEM_TILED (1 << 0)
> > +#define DRM_TEGRA_GEM_BOTTOM_UP (1 << 1)
> > +#define DRM_TEGRA_GEM_FLAGS (DRM_TEGRA_GEM_TILED | \
> > + DRM_TEGRA_GEM_BOTTOM_UP)
>
> The current userspace won't compile with the above changes, so this is the ABI
> breakage. Please keep the old DRM_TEGRA_GEM_CREATE_* DRM_TEGRA_GEM_* flags
> for now.
It looks like I fumbled this during a rebase and didn't catch it. I've
left the original flags in.
[...]
> > +/**
> > + * struct drm_tegra_syncpt_read - parameters for the read syncpoint IOCTL
> > + */
> > struct drm_tegra_syncpt_read {
> > + /**
> > + * @id:
> > + *
> > + * ID of the syncpoint to read the current value from.
> > + */
> > __u32 id;
> > +
> > + /**
> > + * @value:
> > + *
> > + * Return location for the current syncpoint value.
> > + */> __u32 value;
> > };
>
> What about:
>
> Returned value of the given syncpoint.
>
> Could we replace "return location for the.." with just "Returned.." in other
> places too? My mind is stuttering while reading "location for the value",
> though
> I know that my english isn't ideal and maybe it's only me.
How about something a little more explicit, like:
The current value of the syncpoint. Will be set by the kernel
upon successful completion of the IOCTL.
?
> >
> > +/**
> > + * struct drm_tegra_syncpt_incr - parameters for the increment syncpoint
> > IOCTL
> > + */
> > struct drm_tegra_syncpt_incr {
> > + /**
> > + * @id:
> > + *
> > + * ID of the syncpoint to read the current value from.
> > + */
>
> Cut-n-pasted comment. Change to:
>
> ID of the syncpoint to increment.
Good catch. Fixed.
> > __u32 id;
> > +
> > + /**
> > + * @pad:
> > + *
> > + * Structure padding that may be used in the future. Must be 0.
> > + */
> > __u32 pad;
> > };
> >
> > +/**
> > + * struct drm_tegra_syncpt_wait - parameters for the wait syncpoint IOCTL
> > + */
> > struct drm_tegra_syncpt_wait {
> > + /**
> > + * @id:
> > + *
> > + * ID of the syncpoint to wait on.
> > + */
> > __u32 id;
> > +
> > + /**
> > + * @thresh:
> > + *
> > + * Threshold value for which to wait.
> > + */
> > __u32 thresh;
> > +
> > + /**
> > + * @timeout:
> > + *
> > + * Timeout, in milliseconds, to wait.
> > + */
> > __u32 timeout;
> > +
> > + /**
> > + * @value:
> > + *
> > + * Return value for the current syncpoint value.
> > + */
> Just:
>
> Returned value of the syncpoint.
Will reword this similar to the above.
> > __u32 value;
> > };
> >
> > #define DRM_TEGRA_NO_TIMEOUT (0xffffffff)
> >
> > +/**
> > + * struct drm_tegra_open_channel - parameters for the open channel IOCTL
> > + */
> > struct drm_tegra_open_channel {
> > + /**
> > + * @client:
> > + *
> > + * The client ID for this channel.
> > + */
> > __u32 client;
> > +
> > + /**
> > + * @pad:
> > + *
> > + * Structure padding that may be used in the future. Must be 0.
> > + */
> > __u32 pad;
> > +
> > + /**
> > + * @context:
> > + *
> > + * Return location for the application context of this channel. This
> > + * context needs to be passed to the DRM_TEGRA_CHANNEL_CLOSE or the
> > + * DRM_TEGRA_SUBMIT IOCTLs.
> > + */
> > __u64 context;
> > };
> >
> > +/**
> > + * struct drm_tegra_close_channel - parameters for the close channel IOCTL
> > + */
> > struct drm_tegra_close_channel {
> > + /**
> > + * @context:
> > + *
> > + * The application context of this channel. This is obtained from the
> > + * DRM_TEGRA_OPEN_CHANNEL IOCTL.
> > + */
> > __u64 context;
> > };
> >
> > +/**
> > + * struct drm_tegra_get_syncpt - parameters for the get syncpoint IOCTL
> > + */
> > struct drm_tegra_get_syncpt {
> > + /**
> > + * @context:
> > + *
> > + * The application context identifying the channel for which to obtain
> > + * the syncpoint ID.
> > + */
> > __u64 context;
> > +
> > + /**
> > + * @index:
> > + *
> > + * Channel-relative index of the syncpoint for which to obtain the ID.
> > + */
> > __u32 index;
>
> Client-relative. And what about:
>
> Clients syncpoint index for which to obtain the ID.
I'll try to find some better wording for this.
> > +
> > + /**
> > + * @id:
> > + *
> > + * Return location for the ID of the given syncpoint.
> > + */
> > __u32 id;
> > };>
> > +/**
> > + * struct drm_tegra_get_syncpt_base - parameters for the get wait base
> > IOCTL
> > + */
> > struct drm_tegra_get_syncpt_base {
> > + /**
> > + * @context:
> > + *
> > + * The application context identifying for which channel to obtain the
> > + * wait base.
> > + */
> > __u64 context;
> > +
> > + /**
> > + * @syncpt:
> > + *
> > + * ID of the syncpoint for which to obtain the wait base.
> > + */
> > __u32 syncpt;
> > +
> > + /**
> > + * @id:
> > + *
> > + * Return location for the ID of the wait base.
> > + */
> > __u32 id;
> > };
> >
> > +/**
> > + * struct drm_tegra_syncpt - syncpoint increment operation
> > + */
> > struct drm_tegra_syncpt {
> > + /**
> > + * @id:
> > + *
> > + * ID of the syncpoint to operate on.
> > + */
> > __u32 id;
> > +
> > + /**
> > + * @incrs:
> > + *
> > + * Number of increments to perform for the syncpoint.
> > + */
> > __u32 incrs;
> > };
> >
> > +/**
> > + * struct drm_tegra_cmdbuf - structure describing a command buffer
> > + */
> > struct drm_tegra_cmdbuf {
> > + /**
> > + * @handle:
> > + *
> > + * Handle to a GEM object containing the command buffer.
> > + */
> > __u32 handle;
> > +
> > + /**
> > + * @offset:
> > + *
> > + * Offset, in bytes, into the GEM object identified by @handle at
> > + * which the command buffer starts.
> > + */
> > __u32 offset;
> > +
> > + /**
> > + * @words:
> > + *
> > + * Number of 32-bit words in this command buffer.
> > + */
> > __u32 words;
> > +
> > + /**
> > + * @pad:
> > + *
> > + * Structure padding that may be used in the future. Must be 0.
> > + */
> > __u32 pad;
> > };
> >
> > +/**
> > + * struct drm_tegra_reloc - GEM object relocation structure
> > + */
> > struct drm_tegra_reloc {
> > struct {
> > + /**
> > + * @cmdbuf.handle:
> > + *
> > + * Handle to the GEM object containing the command buffer for
> > + * which to perform this GEM object relocation.
> > + */
> > __u32 handle;
> > +
> > + /**
> > + * @cmdbuf.offset:
> > + *
> > + * Offset into the command buffer at which to insert the the
>
> Offset, in bytes,
Done.
> > + * relocated address.
> > + */
> > __u32 offset;
> > } cmdbuf;
> > struct {
> > + /**
> > + * @target.handle:
> > + *
> > + * Handle to the GEM object to be relocated.
> > + */
> > __u32 handle;
> > +
> > + /**
> > + * @target.offset:
> > + *
> > + * Offset into the target GEM object at which the relocated
>
> Offset, in bytes,
Done.
> > + * data starts.
> > + */
> > __u32 offset;
> > } target;
> > +
> > + /**
> > + * @shift:
> > + *
> > + * The number of bits by which to shift relocated addresses.
> > + */
> > __u32 shift;
> > +
> > + /**
> > + * @pad:
> > + *
> > + * Structure padding that may be used in the future. Must be 0.
> > + */
> > __u32 pad;
> > };
> >
> > +/**
> > + * struct drm_tegra_waitchk - wait check structure
> > + */
> > struct drm_tegra_waitchk {
> > + /**
> > + * @handle:
> > + *
> > + * Handle to the GEM object containing a command stream on which to
> > + * perform the wait check.
> > + */
> > __u32 handle;
> > +
> > + /**
> > + * @offset:
> > + *
> > + * Offset, in bytes, of the location in the command stream to perform
> > + * the wait check on.
> > + */
> > __u32 offset;
> > +
> > + /**
> > + * @syncpt:
> > + *
> > + * ID of the syncpoint to wait check.
> > + */
> > __u32 syncpt;
> > +
> > + /**
> > + * @thresh:
> > + *
> > + * Threshold value for which to check.
> > + */
> > __u32 thresh;
> > };
> >
> > +/**
> > + * struct drm_tegra_submit - job submission structure
> > + */
> > struct drm_tegra_submit {
> > + /**
> > + * @context:
> > + *
> > + * The application context identifying the channel to use for the
> > + * execution of this job.
> > + */
> > __u64 context;
> > +
> > + /**
> > + * @num_syncpts:
> > + *
> > + * The number of syncpoints operated on by this job.
> > + */
> > __u32 num_syncpts;
> > +
> > + /**
> > + * @num_cmdbufs:
> > + *
> > + * The number of command buffers to execute as part of this job.
> > + */
> > __u32 num_cmdbufs;
> > +
> > + /**
> > + * @num_relocs:
> > + *
> > + * The number of relocations to perform before executing this job.
> > + */
> > __u32 num_relocs;
> > +
> > + /**
> > + * @num_waitchks:
> > + *
> > + * The number of wait checks to perform as part of this job.
> > + */
> > __u32 num_waitchks;
> > +
> > + /**
> > + * @waitchk_mask:
> > + *
> > + * Bitmask of valid wait checks.
> > + */
> > __u32 waitchk_mask;
> > +
> > + /**
> > + * @timeout:
> > + *
> > + * Timeout, in milliseconds, before this job is cancelled.
> > + */
> > __u32 timeout;
> > +
> > + /**
> > + * @syncpts:
> > + *
> > + * A pointer to @num_syncpts &struct drm_tegra_syncpt structures that
> > + * specify the syncpoint operations performed as part of this job.
> > + */
> > __u64 syncpts;
> > +
> > + /**
> > + * @cmdbufs:
> > + *
> > + * A pointer to @num_cmdbufs &struct drm_tegra_cmdbuf_legacy
>
> We don't have drm_tegra_cmdbuf_legacy yet, should be drm_tegra_cmdbuf.
Done.
> > + * structures that define the command buffers to execute as part of
> > + * this job.
> > + */
> > __u64 cmdbufs;
> > +
> > + /**
> > + * @relocs:
> > + *
> > + * A pointer to @num_relocs &struct drm_tegra_reloc_legacy structures
> > + * that specify the relocations that need to be performed before
> > + * executing this job.
> > + */
>
> Same as for drm_tegra_cmdbuf_legacy.
Done.
> > __u64 relocs;
> > +
> > + /**
> > + * @waitchks:
> > + *
> > + * A pointer to @num_waitchks &struct drm_tegra_waitchk structures
> > + * that specify the wait checks to be performed while executing this
> > + * job.
> > + */
> > __u64 waitchks;
> > - __u32 fence; /* Return value */
> >
> > - __u32 reserved[5]; /* future expansion */
> > + /**
> > + * @fence:
> > + *
> > + * Return location for the threshold of the syncpoint associated with
> > + * this job. This can be used with the DRM_TEGRA_SYNCPT_WAIT IOCTL to
> > + * wait for this job to be finished.
> > + */
> > + __u32 fence;
> > +
> > + /**
> > + * @reserved:
> > + *
> > + * This field is reserved for future use. Must be 0.
> > + */
> > + __u32 reserved[5];
> > };
> >
> > #define DRM_TEGRA_GEM_TILING_MODE_PITCH 0
> > #define DRM_TEGRA_GEM_TILING_MODE_TILED 1
> > #define DRM_TEGRA_GEM_TILING_MODE_BLOCK 2
> >
> > +/**
> > + * struct drm_tegra_gem_set_tiling - parameters for the set tiling IOCTL
> > + */
> > struct drm_tegra_gem_set_tiling {
> > - /* input */
> > + /**
> > + * @handle:
> > + *
> > + * Handle to the GEM object for which to set the tiling parameters.
> > + */
> > __u32 handle;
> > +
> > + /**
> > + * @mode:
> > + *
> > + * The tiling mode to set. Must be one of:
> > + *
> > + * DRM_TEGRA_GEM_TILING_MODE_PITCH
> > + * pitch linear format
> > + *
> > + * DRM_TEGRA_GEM_TILING_MODE_TILED
> > + * 16x16 tiling format
> > + *
> > + * DRM_TEGRA_GEM_TILING_MODE_BLOCK
> > + * 16Bx2 tiling format
> > + */
> > __u32 mode;
> > +
> > + /**
> > + * @value:
> > + *
> > + * The value to set for the tiling mode parameter.
> > + */
> > __u32 value;
> > +
> > + /**
> > + * @pad:
> > + *
> > + * Structure padding that may be used in the future. Must be 0.
> > + */
> > __u32 pad;
> > };
> >
> > +/**
> > + * struct drm_tegra_gem_get_tiling - parameters for the get tiling IOCTL
> > + */
> > struct drm_tegra_gem_get_tiling {
> > - /* input */
> > + /**
> > + * @handle:
> > + *
> > + * Handle to the GEM object for which to query the tiling parameters.
> > + */
> > __u32 handle;
> > - /* output */
> > +
> > + /**
> > + * @mode:
> > + *
> > + * Return location for the tiling mode.
> > + */
> > __u32 mode;
> > +
> > + /**
> > + * @value:
> > + *
> > + * Return location for the tiling mode parameter.
> > + */
> > __u32 value;
> > +
> > + /**
> > + * @pad:
> > + *
> > + * Structure padding that may be used in the future. Must be 0.
> > + */
> > __u32 pad;
> > };
> >
> > -#define DRM_TEGRA_GEM_BOTTOM_UP (1 << 0)
> > -#define DRM_TEGRA_GEM_FLAGS (DRM_TEGRA_GEM_BOTTOM_UP)
> > -
> > +/**
> > + * struct drm_tegra_gem_set_flags - parameters for the set flags IOCTL
> > + */
> > struct drm_tegra_gem_set_flags {
> > - /* input */
> > + /**
> > + * @handle:
> > + *
> > + * Handle to the GEM object for which to set the flags.
> > + */
> > __u32 handle;
> > - /* output */
> > +
> > + /**
> > + * @flags:
> > + *
> > + * The flags to set for the GEM object.
> > + */
> > __u32 flags;
> > };
> >
> > +/**
> > + * struct drm_tegra_gem_get_flags - parameters for the get flags IOCTL
> > + */
> > struct drm_tegra_gem_get_flags {
> > - /* input */
> > + /**
> > + * @handle:
> > + *
> > + * Handle to the GEM object for which to query the flags.
> > + */
> > __u32 handle;
> > - /* output */
> > +
> > + /**
> > + * @flags:
> > + *
> > + * Return location for the flags queried from the GEM object.
> > + */
> > __u32 flags;
> > };
> >
Thanks for the review. I'm going to think about a better wording for
some of the descriptions and send out a new version of this patch
individually, for review.
Thierry
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