From 9435373ef8870e0a84b6fec0ad89b952bf3097fa Mon Sep 17 00:00:00 2001 From: Rodrigo Vivi Date: Wed, 28 Aug 2013 16:45:46 -0300 Subject: [PATCH] drm/i915: Report enabled slices on Haswell GT3 Batchbuffers constructed by userspace can conditionalise their URB allocations through the use of the MI_SET_PREDICATE command. This command can read the MI_PREDICATE_RESULT_2 register to see how many slices are enabled on GT3, and by virtue of the result, scale their memory allocations to fit enabled memory. Of course, this only works if the kernel sets the appropriate bit in the register first. v2: Better commit subject and message by Chris Wilson. Cc: Chris Wilson Credits-to: Yejun Guo Signed-off-by: Rodrigo Vivi Reviewed-by: Chris Wilson Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.h | 2 ++ drivers/gpu/drm/i915/i915_gem.c | 5 +++++ drivers/gpu/drm/i915/i915_reg.h | 5 +++++ 3 files changed, 12 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 2cf9dabbfe5d..e52648927475 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1603,6 +1603,8 @@ struct drm_i915_file_private { ((dev)->pci_device & 0xFF00) == 0x0C00) #define IS_ULT(dev) (IS_HASWELL(dev) && \ ((dev)->pci_device & 0xFF00) == 0x0A00) +#define IS_HSW_GT3(dev) (IS_HASWELL(dev) && \ + ((dev)->pci_device & 0x00F0) == 0x0020) /* * The genX designation typically refers to the render engine, so render diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c index d57368d5fc1d..2d4b72ab1229 100644 --- a/drivers/gpu/drm/i915/i915_gem.c +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -4331,6 +4331,11 @@ i915_gem_init_hw(struct drm_device *dev) if (dev_priv->ellc_size) I915_WRITE(HSW_IDICR, I915_READ(HSW_IDICR) | IDIHASHMSK(0xf)); + if (IS_HSW_GT3(dev)) + I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_ENABLED); + else + I915_WRITE(MI_PREDICATE_RESULT_2, LOWER_SLICE_DISABLED); + if (HAS_PCH_NOP(dev)) { u32 temp = I915_READ(GEN7_MSG_CTL); temp &= ~(WAIT_FOR_PCH_FLR_ACK | WAIT_FOR_PCH_RESET_ACK); diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index f626a16a14fa..c7f2da36f4a8 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -264,6 +264,11 @@ #define MI_SEMAPHORE_SYNC_VVE (1<<16) /* VECS wait for VCS (VEVSYNC) */ #define MI_SEMAPHORE_SYNC_RVE (2<<16) /* VECS wait for RCS (VERSYNC) */ #define MI_SEMAPHORE_SYNC_INVALID (3<<16) + +#define MI_PREDICATE_RESULT_2 (0x2214) +#define LOWER_SLICE_ENABLED (1<<0) +#define LOWER_SLICE_DISABLED (0<<0) + /* * 3D instructions used by the kernel */ -- 2.20.1