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drm/i915: Extract CSB status read 

This is a useful thing to have around as a function because the mechanism may
change in the future.

There is a net increase in LOC here, and it will continue to be the case on GEN8
and GEN9 - but future GENs may have an alternate mechanism for doing this.

Signed-off-by: Ben Widawsky <benjamin.widawsky@intel.com>
Reviewed-by: Michel Thierry <michel.thierry@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1452018609-10142-4-git-send-email-benjamin.widawsky@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2016-01-05 10:30:07 -08:00 committed by Daniel Vetter
parent f764a8b146
commit 91a4103206
1 changed files with 16 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/gpu/drm/i915/intel_lrc.c
View File

@ -496,6 +496,19 @@ static bool execlists_check_remove_request(struct intel_engine_cs *ring,
return false;
}
static void get_context_status(struct intel_engine_cs *ring,
u8 read_pointer,
u32 *status, u32 *context_id)
{
struct drm_i915_private *dev_priv = ring->dev->dev_private;
if (WARN_ON(read_pointer >= GEN8_CSB_ENTRIES))
return;
*status = I915_READ(RING_CONTEXT_STATUS_BUF_LO(ring, read_pointer));
*context_id = I915_READ(RING_CONTEXT_STATUS_BUF_HI(ring, read_pointer));
}
/**
* intel_lrc_irq_handler() - handle Context Switch interrupts
* @ring: Engine Command Streamer to handle.
@ -523,9 +536,9 @@ void intel_lrc_irq_handler(struct intel_engine_cs *ring)
spin_lock(&ring->execlist_lock);
while (read_pointer < write_pointer) {
read_pointer++;
status = I915_READ(RING_CONTEXT_STATUS_BUF_LO(ring, read_pointer % GEN8_CSB_ENTRIES));
status_id = I915_READ(RING_CONTEXT_STATUS_BUF_HI(ring, read_pointer % GEN8_CSB_ENTRIES));
get_context_status(ring, ++read_pointer % GEN8_CSB_ENTRIES,
&status, &status_id);
if (status & GEN8_CTX_STATUS_IDLE_ACTIVE)
continue;