[Mesa-dev] [PATCH] intel/gen9+: Enable object level preemption.
Rafael Antognolli
rafael.antognolli at intel.com
Tue Feb 20 16:11:14 UTC 2018
On Fri, Feb 16, 2018 at 06:37:55PM -0800, Ben Widawsky wrote:
> On 18-02-16 13:44:00, Antognolli, Rafael wrote:
> > "This field controls the granularity of the replay mechanism when
> > coming back into a previously preempted context."
> >
> > The kernel disables this bit but whitelists the register, and it's a
> > context register. So enable it and take advantage of finer granularity
> > when preemption is available.
> >
>
> Does the kernel actually disable it? I thought the kernel just doesn't touch it
> (I don't think it's whitelisted by the kernel either, it's just writable).
I'm seeing it being disabled at WaDisable3DMidCmdPreemption, seems to be
in effect since commit 5152defe4a53ad15e6d96c422440152302c8abd7.
And it's whitelisted by WaEnablePreemptionGranularityControlByUMD.
> > Signed-off-by: Rafael Antognolli <rafael.antognolli at intel.com>
> > Cc: Ben Widawsky <ben at bwidawsk.net>
> > ---
> >
> > This patch still needs more testing (only ran it through CI and also did
> > some basic tests on my machine to make sure it's not breaking anything).
> >
> > src/intel/genxml/gen10.xml | 8 ++++++++
> > src/intel/genxml/gen11.xml | 8 ++++++++
> > src/intel/genxml/gen9.xml | 8 ++++++++
> > src/intel/vulkan/genX_state.c | 18 ++++++++++++++++++
> > src/mesa/drivers/dri/i965/brw_defines.h | 5 +++++
> > src/mesa/drivers/dri/i965/brw_state_upload.c | 10 ++++++++++
> > 6 files changed, 57 insertions(+)
> >
> > diff --git a/src/intel/genxml/gen10.xml b/src/intel/genxml/gen10.xml
> > index 47c679a3fa9..42ac6e82696 100644
> > --- a/src/intel/genxml/gen10.xml
> > +++ b/src/intel/genxml/gen10.xml
> > @@ -3692,6 +3692,14 @@
> > <field name="All Allocation" start="25" end="31" type="uint"/>
> > </register>
> >
> > + <register name="CS_CHICKEN1" length="1" num="0x2580">
> > + <field name="Replay Mode" start="0" end="0" type="uint">
> > + <value name="Mid-cmdbuffer Preemption" value="0"/>
> > + <value name="Object Level Preemption" value="1"/>
> > + </field>
> > + <field name="Replay Mode Mask" start="16" end="16" type="bool"/>
> > + </register>
> > +
> > <register name="SO_WRITE_OFFSET0" length="1" num="0x5280">
> > <field name="Write Offset" start="2" end="31" type="offset"/>
> > </register>
> > diff --git a/src/intel/genxml/gen11.xml b/src/intel/genxml/gen11.xml
> > index 9a8a2fe21e3..e6ce42b2bfb 100644
> > --- a/src/intel/genxml/gen11.xml
> > +++ b/src/intel/genxml/gen11.xml
> > @@ -3688,6 +3688,14 @@
> > <field name="All Allocation" start="25" end="31" type="uint"/>
> > </register>
> >
> > + <register name="CS_CHICKEN1" length="1" num="0x2580">
> > + <field name="Replay Mode" start="0" end="0" type="uint">
> > + <value name="Mid-cmdbuffer Preemption" value="0"/>
> > + <value name="Object Level Preemption" value="1"/>
> > + </field>
> > + <field name="Replay Mode Mask" start="16" end="16" type="bool"/>
> > + </register>
> > +
> > <register name="SO_WRITE_OFFSET0" length="1" num="0x5280">
> > <field name="Write Offset" start="2" end="31" type="offset"/>
> > </register>
> > diff --git a/src/intel/genxml/gen9.xml b/src/intel/genxml/gen9.xml
> > index 7eef4bee013..45e1fddeb50 100644
> > --- a/src/intel/genxml/gen9.xml
> > +++ b/src/intel/genxml/gen9.xml
> > @@ -3638,6 +3638,14 @@
> > <field name="All Allocation" start="25" end="31" type="uint"/>
> > </register>
> >
> > + <register name="CS_CHICKEN1" length="1" num="0x2580">
> > + <field name="Replay Mode" start="0" end="0" type="uint">
> > + <value name="Mid-cmdbuffer Preemption" value="0"/>
> > + <value name="Object Level Preemption" value="1"/>
> > + </field>
> > + <field name="Replay Mode Mask" start="16" end="16" type="bool"/>
> > + </register>
> > +
> > <register name="SO_WRITE_OFFSET0" length="1" num="0x5280">
> > <field name="Write Offset" start="2" end="31" type="offset"/>
> > </register>
> > diff --git a/src/intel/vulkan/genX_state.c b/src/intel/vulkan/genX_state.c
> > index 54fb8634fdc..83b6c6387f3 100644
> > --- a/src/intel/vulkan/genX_state.c
> > +++ b/src/intel/vulkan/genX_state.c
> > @@ -169,6 +169,24 @@ genX(init_device_state)(struct anv_device *device)
> > gen10_emit_wa_lri_to_cache_mode_zero(&batch);
> > #endif
> >
> > +#if GEN_GEN >= 9
> > + /* A fixed function pipe flush is required before modifying this field */
> > + anv_batch_emit(&batch, GENX(PIPE_CONTROL), pipe) {
> > + pipe.PipeControlFlushEnable = true;
> > + }
> > +
> > + /* enable object level preemption */
> > + uint32_t csc1;
> > +
> > + anv_pack_struct(&csc1, GENX(CS_CHICKEN1),
> > + .ReplayMode = ObjectLevelPreemption,
> > + .ReplayModeMask = 1);
> > + anv_batch_emit(&batch, GENX(MI_LOAD_REGISTER_IMM), lri) {
> > + lri.RegisterOffset = GENX(CS_CHICKEN1_num);
> > + lri.DataDWord = csc1;
> > + }
> > +#endif
> > +
> > anv_batch_emit(&batch, GENX(MI_BATCH_BUFFER_END), bbe);
> >
> > assert(batch.next <= batch.end);
> > diff --git a/src/mesa/drivers/dri/i965/brw_defines.h b/src/mesa/drivers/dri/i965/brw_defines.h
> > index 8bf6f68b67c..f0994d3b139 100644
> > --- a/src/mesa/drivers/dri/i965/brw_defines.h
> > +++ b/src/mesa/drivers/dri/i965/brw_defines.h
> > @@ -1661,4 +1661,9 @@ enum brw_pixel_shader_coverage_mask_mode {
> > # define GLK_SCEC_BARRIER_MODE_3D_HULL (1 << 7)
> > # define GLK_SCEC_BARRIER_MODE_MASK REG_MASK(1 << 7)
> >
> > +#define CS_CHICKEN1 0x2580 /* Gen9+ */
> > +# define GEN9_REPLAY_MODE_MIDBUFFER (0 << 0)
> > +# define GEN9_REPLAY_MODE_MIDOBJECT (1 << 0)
> > +# define GEN9_REPLAY_MODE_MASK REG_MASK(1 << 0)
> > +
> > #endif
> > diff --git a/src/mesa/drivers/dri/i965/brw_state_upload.c b/src/mesa/drivers/dri/i965/brw_state_upload.c
> > index 86c12e4d357..a90dc01d87b 100644
> > --- a/src/mesa/drivers/dri/i965/brw_state_upload.c
> > +++ b/src/mesa/drivers/dri/i965/brw_state_upload.c
> > @@ -115,6 +115,16 @@ brw_upload_initial_gpu_state(struct brw_context *brw)
> > OUT_BATCH(0);
> > ADVANCE_BATCH();
> > }
> > +
> > + if (devinfo->gen >= 9) {
> > + /* A fixed function pipe flush is required before modifying this field */
> > + brw_emit_pipe_control_flush(brw, PIPE_CONTROL_FLUSH_ENABLE);
> > +
> > + /* enable object level preemption */
> > + brw_load_register_imm32(brw, CS_CHICKEN1,
> > + GEN9_REPLAY_MODE_MIDOBJECT |
> > + GEN9_REPLAY_MODE_MASK);
> > + }
>
> One other option BTW is a context parameter in i915 driver. Note sure if you
> discussed this with the i915 folks, but it could make some sense.
I haven't, but will do that. Thanks for the review.
> > }
> >
> > static inline const struct brw_tracked_state *
>
> Everything looks in order to me.
>
> Reviewed-by: Ben Widawsky <ben at bwidawsk.net>
>
> > --
> > 2.14.3
> >
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