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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-02 23:50:29 +0200 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-08-02 23:58:24 +0200 |
| commit | c5efa1ad09784905ae31cd65b659cc73c09fd290 (patch) | |
| tree | b87da28fd7e4da5eada8378eeb20a397510c5a2b /drivers/gpu/drm/i915/intel_ringbuffer.h | |
| parent | drm/i915: Remove intel_ring_get_tail() (diff) | |
| download | linux-c5efa1ad09784905ae31cd65b659cc73c09fd290.tar.xz linux-c5efa1ad09784905ae31cd65b659cc73c09fd290.zip | |
drm/i915: Convert engine->write_tail to operate on a request
If we rewrite the I915_WRITE_TAIL specialisation for the legacy
ringbuffer as submitting the request onto the ringbuffer, we can unify
the vfunc with both execlists and GuC in the next patch.
v2: Drop the modulus from the I915_WRITE_TAIL as it is currently being
applied in intel_ring_advance() after every command packet, and add a
comment explaining why we need the modulus at all.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1469432687-22756-22-git-send-email-chris@chris-wilson.co.uk
Link: http://patchwork.freedesktop.org/patch/msgid/1470174640-18242-12-git-send-email-chris@chris-wilson.co.uk
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ringbuffer.h')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.h | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h index 0c3c7185d9ad..14d2ea36fb88 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.h +++ b/drivers/gpu/drm/i915/intel_ringbuffer.h @@ -204,8 +204,6 @@ struct intel_engine_cs { int (*init_context)(struct drm_i915_gem_request *req); - void (*write_tail)(struct intel_engine_cs *engine, - u32 value); int (*add_request)(struct drm_i915_gem_request *req); /* Some chipsets are not quite as coherent as advertised and need * an expensive kick to force a true read of the up-to-date seqno. @@ -296,6 +294,7 @@ struct intel_engine_cs { #define I915_DISPATCH_SECURE 0x1 #define I915_DISPATCH_PINNED 0x2 #define I915_DISPATCH_RS 0x4 + void (*submit_request)(struct drm_i915_gem_request *req); /** * List of objects currently involved in rendering from the @@ -461,6 +460,13 @@ static inline void intel_ring_emit_reg(struct intel_ring *ring, i915_reg_t reg) static inline void intel_ring_advance(struct intel_ring *ring) { + /* The modulus is required so that we avoid writing + * request->tail == ring->size, rather than the expected 0, + * into the RING_TAIL register as that can cause a GPU hang. + * As this is only strictly required for the request->tail, + * and only then as we write the value into hardware, we can + * one day remove the modulus after every command packet. + */ ring->tail &= ring->size - 1; } |