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drm/i915: Generalise common GPU engine reset request/unrequest code 

GPU engine reset handshaking is something that is applicable to both full GPU
reset and engine reset, which is something that is part of the upcoming TDR
per-engine hang recovery patches. Break out the common engine reset
request/unrequest code (originally written by Mika Kuoppala) for reuse later
in the TDR enablement patch series.

v2: correct indentation and drop unused returned value (Mika)
v3: We have forcewake during reset so use *_FW reg access (Mika)

Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Tomas Elf <tomas.elf@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
[Mika: Fixed format warning]
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1456929984-16323-1-git-send-email-mika.kuoppala@intel.com
This commit is contained in:
Tomas Elf 2016-03-02 16:46:24 +02:00 committed by Mika Kuoppala
parent 37f2248e3d
commit d431440cce
1 changed files with 36 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
drivers/gpu/drm/i915/intel_uncore.c
View File

@ -1531,13 +1531,40 @@ static int gen6_do_reset(struct drm_device *dev)
return ret;
}
static int wait_for_register(struct drm_i915_private *dev_priv,
i915_reg_t reg,
const u32 mask,
const u32 value,
const unsigned long timeout_ms)
static int wait_for_register_fw(struct drm_i915_private *dev_priv,
i915_reg_t reg,
const u32 mask,
const u32 value,
const unsigned long timeout_ms)
{
return wait_for((I915_READ(reg) & mask) == value, timeout_ms);
return wait_for((I915_READ_FW(reg) & mask) == value, timeout_ms);
}
static int gen8_request_engine_reset(struct intel_engine_cs *engine)
{
int ret;
struct drm_i915_private *dev_priv = engine->dev->dev_private;
I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
_MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
ret = wait_for_register_fw(dev_priv,
RING_RESET_CTL(engine->mmio_base),
RESET_CTL_READY_TO_RESET,
RESET_CTL_READY_TO_RESET,
700);
if (ret)
DRM_ERROR("%s: reset request timeout\n", engine->name);
return ret;
}
static void gen8_unrequest_engine_reset(struct intel_engine_cs *engine)
{
struct drm_i915_private *dev_priv = engine->dev->dev_private;
I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
_MASKED_BIT_DISABLE(RESET_CTL_REQUEST_RESET));
}
static int gen8_do_reset(struct drm_device *dev)
@ -1546,26 +1573,15 @@ static int gen8_do_reset(struct drm_device *dev)
struct intel_engine_cs *engine;
int i;
for_each_ring(engine, dev_priv, i) {
I915_WRITE(RING_RESET_CTL(engine->mmio_base),
_MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
if (wait_for_register(dev_priv,
RING_RESET_CTL(engine->mmio_base),
RESET_CTL_READY_TO_RESET,
RESET_CTL_READY_TO_RESET,
700)) {
DRM_ERROR("%s: reset request timeout\n", engine->name);
for_each_ring(engine, dev_priv, i)
if (gen8_request_engine_reset(engine))
goto not_ready;
}
}
return gen6_do_reset(dev);
not_ready:
for_each_ring(engine, dev_priv, i)
I915_WRITE(RING_RESET_CTL(engine->mmio_base),
_MASKED_BIT_DISABLE(RESET_CTL_REQUEST_RESET));
gen8_unrequest_engine_reset(engine);
return -EIO;
}