[Intel-gfx] [PATCH 2/3] drm/i915: Use unchecked writes for setting up the fences
Chris Wilson
chris at chris-wilson.co.uk
Fri May 31 16:11:29 UTC 2019
As the fence registers are not part of the engine powerwells, we do not
need to fiddle with forcewake in order to update a fence. Avoid using
the heavyweight debug checking normal mmio writes as the checking
dominates the selftest runtime and is superfluous!
In the process, retire the I915_WRITE() implicit macro with the new
intel_uncore_write interface.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem_fence_reg.c | 123 ++++++++++++----------
1 file changed, 68 insertions(+), 55 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_fence_reg.c b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
index 2e9e32330aaa..c68730fb21e6 100644
--- a/drivers/gpu/drm/i915/i915_gem_fence_reg.c
+++ b/drivers/gpu/drm/i915/i915_gem_fence_reg.c
@@ -94,9 +94,10 @@ static void i965_write_fence_reg(struct drm_i915_fence_reg *fence,
}
if (!pipelined) {
- struct drm_i915_private *dev_priv = fence->i915;
+ struct intel_uncore *unc = &fence->i915->uncore;
- /* To w/a incoherency with non-atomic 64-bit register updates,
+ /*
+ * To w/a incoherency with non-atomic 64-bit register updates,
* we split the 64-bit update into two 32-bit writes. In order
* for a partial fence not to be evaluated between writes, we
* precede the update with write to turn off the fence register,
@@ -105,12 +106,12 @@ static void i965_write_fence_reg(struct drm_i915_fence_reg *fence,
* For extra levels of paranoia, we make sure each step lands
* before applying the next step.
*/
- I915_WRITE(fence_reg_lo, 0);
- POSTING_READ(fence_reg_lo);
+ intel_uncore_write_fw(unc, fence_reg_lo, 0);
+ intel_uncore_posting_read_fw(unc, fence_reg_lo);
- I915_WRITE(fence_reg_hi, upper_32_bits(val));
- I915_WRITE(fence_reg_lo, lower_32_bits(val));
- POSTING_READ(fence_reg_lo);
+ intel_uncore_write_fw(unc, fence_reg_hi, upper_32_bits(val));
+ intel_uncore_write_fw(unc, fence_reg_lo, lower_32_bits(val));
+ intel_uncore_posting_read_fw(unc, fence_reg_lo);
}
}
@@ -146,11 +147,11 @@ static void i915_write_fence_reg(struct drm_i915_fence_reg *fence,
}
if (!pipelined) {
- struct drm_i915_private *dev_priv = fence->i915;
+ struct intel_uncore *unc = &fence->i915->uncore;
i915_reg_t reg = FENCE_REG(fence->id);
- I915_WRITE(reg, val);
- POSTING_READ(reg);
+ intel_uncore_write_fw(unc, reg, val);
+ intel_uncore_posting_read_fw(unc, reg);
}
}
@@ -178,18 +179,19 @@ static void i830_write_fence_reg(struct drm_i915_fence_reg *fence,
}
if (!pipelined) {
- struct drm_i915_private *dev_priv = fence->i915;
+ struct intel_uncore *unc = &fence->i915->uncore;
i915_reg_t reg = FENCE_REG(fence->id);
- I915_WRITE(reg, val);
- POSTING_READ(reg);
+ intel_uncore_write_fw(unc, reg, val);
+ intel_uncore_posting_read_fw(unc, reg);
}
}
static void fence_write(struct drm_i915_fence_reg *fence,
struct i915_vma *vma)
{
- /* Previous access through the fence register is marshalled by
+ /*
+ * Previous access through the fence register is marshalled by
* the mb() inside the fault handlers (i915_gem_release_mmaps)
* and explicitly managed for internal users.
*/
@@ -201,7 +203,8 @@ static void fence_write(struct drm_i915_fence_reg *fence,
else
i965_write_fence_reg(fence, vma);
- /* Access through the fenced region afterwards is
+ /*
+ * Access through the fenced region afterwards is
* ordered by the posting reads whilst writing the registers.
*/
@@ -308,11 +311,11 @@ int i915_vma_put_fence(struct i915_vma *vma)
return fence_update(fence, NULL);
}
-static struct drm_i915_fence_reg *fence_find(struct drm_i915_private *dev_priv)
+static struct drm_i915_fence_reg *fence_find(struct drm_i915_private *i915)
{
struct drm_i915_fence_reg *fence;
- list_for_each_entry(fence, &dev_priv->mm.fence_list, link) {
+ list_for_each_entry(fence, &i915->mm.fence_list, link) {
GEM_BUG_ON(fence->vma && fence->vma->fence != fence);
if (fence->pin_count)
@@ -322,7 +325,7 @@ static struct drm_i915_fence_reg *fence_find(struct drm_i915_private *dev_priv)
}
/* Wait for completion of pending flips which consume fences */
- if (intel_has_pending_fb_unpin(dev_priv))
+ if (intel_has_pending_fb_unpin(i915))
return ERR_PTR(-EAGAIN);
return ERR_PTR(-EDEADLK);
@@ -353,7 +356,8 @@ i915_vma_pin_fence(struct i915_vma *vma)
struct i915_vma *set = i915_gem_object_is_tiled(vma->obj) ? vma : NULL;
int err;
- /* Note that we revoke fences on runtime suspend. Therefore the user
+ /*
+ * Note that we revoke fences on runtime suspend. Therefore the user
* must keep the device awake whilst using the fence.
*/
assert_rpm_wakelock_held(vma->vm->i915);
@@ -395,28 +399,28 @@ i915_vma_pin_fence(struct i915_vma *vma)
/**
* i915_reserve_fence - Reserve a fence for vGPU
- * @dev_priv: i915 device private
+ * @i915: i915 device private
*
* This function walks the fence regs looking for a free one and remove
* it from the fence_list. It is used to reserve fence for vGPU to use.
*/
struct drm_i915_fence_reg *
-i915_reserve_fence(struct drm_i915_private *dev_priv)
+i915_reserve_fence(struct drm_i915_private *i915)
{
struct drm_i915_fence_reg *fence;
int count;
int ret;
- lockdep_assert_held(&dev_priv->drm.struct_mutex);
+ lockdep_assert_held(&i915->drm.struct_mutex);
/* Keep at least one fence available for the display engine. */
count = 0;
- list_for_each_entry(fence, &dev_priv->mm.fence_list, link)
+ list_for_each_entry(fence, &i915->mm.fence_list, link)
count += !fence->pin_count;
if (count <= 1)
return ERR_PTR(-ENOSPC);
- fence = fence_find(dev_priv);
+ fence = fence_find(i915);
if (IS_ERR(fence))
return fence;
@@ -446,19 +450,19 @@ void i915_unreserve_fence(struct drm_i915_fence_reg *fence)
/**
* i915_gem_restore_fences - restore fence state
- * @dev_priv: i915 device private
+ * @i915: i915 device private
*
* Restore the hw fence state to match the software tracking again, to be called
* after a gpu reset and on resume. Note that on runtime suspend we only cancel
* the fences, to be reacquired by the user later.
*/
-void i915_gem_restore_fences(struct drm_i915_private *dev_priv)
+void i915_gem_restore_fences(struct drm_i915_private *i915)
{
int i;
rcu_read_lock(); /* keep obj alive as we dereference */
- for (i = 0; i < dev_priv->num_fence_regs; i++) {
- struct drm_i915_fence_reg *reg = &dev_priv->fence_regs[i];
+ for (i = 0; i < i915->num_fence_regs; i++) {
+ struct drm_i915_fence_reg *reg = &i915->fence_regs[i];
struct i915_vma *vma = READ_ONCE(reg->vma);
GEM_BUG_ON(vma && vma->fence != reg);
@@ -525,18 +529,19 @@ void i915_gem_restore_fences(struct drm_i915_private *dev_priv)
/**
* i915_gem_detect_bit_6_swizzle - detect bit 6 swizzling pattern
- * @dev_priv: i915 device private
+ * @i915: i915 device private
*
* Detects bit 6 swizzling of address lookup between IGD access and CPU
* access through main memory.
*/
void
-i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
+i915_gem_detect_bit_6_swizzle(struct drm_i915_private *i915)
{
+ struct intel_uncore *unc = &i915->uncore;
u32 swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
u32 swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
- if (INTEL_GEN(dev_priv) >= 8 || IS_VALLEYVIEW(dev_priv)) {
+ if (INTEL_GEN(i915) >= 8 || IS_VALLEYVIEW(i915)) {
/*
* On BDW+, swizzling is not used. We leave the CPU memory
* controller in charge of optimizing memory accesses without
@@ -546,9 +551,9 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
*/
swizzle_x = I915_BIT_6_SWIZZLE_NONE;
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
- } else if (INTEL_GEN(dev_priv) >= 6) {
- if (dev_priv->preserve_bios_swizzle) {
- if (I915_READ(DISP_ARB_CTL) &
+ } else if (INTEL_GEN(i915) >= 6) {
+ if (i915->preserve_bios_swizzle) {
+ if (intel_uncore_read(unc, DISP_ARB_CTL) &
DISP_TILE_SURFACE_SWIZZLING) {
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
@@ -558,15 +563,17 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
}
} else {
u32 dimm_c0, dimm_c1;
- dimm_c0 = I915_READ(MAD_DIMM_C0);
- dimm_c1 = I915_READ(MAD_DIMM_C1);
+ dimm_c0 = intel_uncore_read(unc, MAD_DIMM_C0);
+ dimm_c1 = intel_uncore_read(unc, MAD_DIMM_C1);
dimm_c0 &= MAD_DIMM_A_SIZE_MASK | MAD_DIMM_B_SIZE_MASK;
dimm_c1 &= MAD_DIMM_A_SIZE_MASK | MAD_DIMM_B_SIZE_MASK;
- /* Enable swizzling when the channels are populated
+ /*
+ * Enable swizzling when the channels are populated
* with identically sized dimms. We don't need to check
* the 3rd channel because no cpu with gpu attached
* ships in that configuration. Also, swizzling only
- * makes sense for 2 channels anyway. */
+ * makes sense for 2 channels anyway.
+ */
if (dimm_c0 == dimm_c1) {
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
@@ -575,20 +582,23 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
}
}
- } else if (IS_GEN(dev_priv, 5)) {
- /* On Ironlake whatever DRAM config, GPU always do
+ } else if (IS_GEN(i915, 5)) {
+ /*
+ * On Ironlake whatever DRAM config, GPU always do
* same swizzling setup.
*/
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
- } else if (IS_GEN(dev_priv, 2)) {
- /* As far as we know, the 865 doesn't have these bit 6
+ } else if (IS_GEN(i915, 2)) {
+ /*
+ * As far as we know, the 865 doesn't have these bit 6
* swizzling issues.
*/
swizzle_x = I915_BIT_6_SWIZZLE_NONE;
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
- } else if (IS_G45(dev_priv) || IS_I965G(dev_priv) || IS_G33(dev_priv)) {
- /* The 965, G33, and newer, have a very flexible memory
+ } else if (IS_G45(i915) || IS_I965G(i915) || IS_G33(i915)) {
+ /*
+ * The 965, G33, and newer, have a very flexible memory
* configuration. It will enable dual-channel mode
* (interleaving) on as much memory as it can, and the GPU
* will additionally sometimes enable different bit 6
@@ -614,14 +624,16 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
* banks of memory are paired and unswizzled on the
* uneven portion, so leave that as unknown.
*/
- if (I915_READ16(C0DRB3) == I915_READ16(C1DRB3)) {
+ if (intel_uncore_read(unc, C0DRB3) ==
+ intel_uncore_read(unc, C1DRB3)) {
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
}
} else {
- u32 dcc;
+ u32 dcc = intel_uncore_read(unc, DCC);
- /* On 9xx chipsets, channel interleave by the CPU is
+ /*
+ * On 9xx chipsets, channel interleave by the CPU is
* determined by DCC. For single-channel, neither the CPU
* nor the GPU do swizzling. For dual channel interleaved,
* the GPU's interleave is bit 9 and 10 for X tiled, and bit
@@ -629,7 +641,6 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
* can be based on either bit 11 (haven't seen this yet) or
* bit 17 (common).
*/
- dcc = I915_READ(DCC);
switch (dcc & DCC_ADDRESSING_MODE_MASK) {
case DCC_ADDRESSING_MODE_SINGLE_CHANNEL:
case DCC_ADDRESSING_MODE_DUAL_CHANNEL_ASYMMETRIC:
@@ -638,7 +649,8 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
break;
case DCC_ADDRESSING_MODE_DUAL_CHANNEL_INTERLEAVED:
if (dcc & DCC_CHANNEL_XOR_DISABLE) {
- /* This is the base swizzling by the GPU for
+ /*
+ * This is the base swizzling by the GPU for
* tiled buffers.
*/
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
@@ -656,8 +668,8 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
}
/* check for L-shaped memory aka modified enhanced addressing */
- if (IS_GEN(dev_priv, 4) &&
- !(I915_READ(DCC2) & DCC2_MODIFIED_ENHANCED_DISABLE)) {
+ if (IS_GEN(i915, 4) &&
+ !(intel_uncore_read(unc, DCC2) & DCC2_MODIFIED_ENHANCED_DISABLE)) {
swizzle_x = I915_BIT_6_SWIZZLE_UNKNOWN;
swizzle_y = I915_BIT_6_SWIZZLE_UNKNOWN;
}
@@ -672,7 +684,8 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
if (swizzle_x == I915_BIT_6_SWIZZLE_UNKNOWN ||
swizzle_y == I915_BIT_6_SWIZZLE_UNKNOWN) {
- /* Userspace likes to explode if it sees unknown swizzling,
+ /*
+ * Userspace likes to explode if it sees unknown swizzling,
* so lie. We will finish the lie when reporting through
* the get-tiling-ioctl by reporting the physical swizzle
* mode as unknown instead.
@@ -681,13 +694,13 @@ i915_gem_detect_bit_6_swizzle(struct drm_i915_private *dev_priv)
* bit17 dependent, and so we need to also prevent the pages
* from being moved.
*/
- dev_priv->quirks |= QUIRK_PIN_SWIZZLED_PAGES;
+ i915->quirks |= QUIRK_PIN_SWIZZLED_PAGES;
swizzle_x = I915_BIT_6_SWIZZLE_NONE;
swizzle_y = I915_BIT_6_SWIZZLE_NONE;
}
- dev_priv->mm.bit_6_swizzle_x = swizzle_x;
- dev_priv->mm.bit_6_swizzle_y = swizzle_y;
+ i915->mm.bit_6_swizzle_x = swizzle_x;
+ i915->mm.bit_6_swizzle_y = swizzle_y;
}
/*
--
2.20.1
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