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drm/i915: Use unchecked writes for setting up the fences

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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.

v2: s/unc/uncore/

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190604120022.20472-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-06-04 13:00:21 +01:00
parent 87d1372d1d
commit 1c8242c3a4
1 changed files with 68 additions and 55 deletions
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123
drivers/gpu/drm/i915/i915_gem_fence_reg.c
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@ -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 *uncore = &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(uncore, fence_reg_lo, 0);
intel_uncore_posting_read_fw(uncore, 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(uncore, fence_reg_hi, upper_32_bits(val));
intel_uncore_write_fw(uncore, fence_reg_lo, lower_32_bits(val));
intel_uncore_posting_read_fw(uncore, 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 *uncore = &fence->i915->uncore;
i915_reg_t reg = FENCE_REG(fence->id);
I915_WRITE(reg, val);
POSTING_READ(reg);
intel_uncore_write_fw(uncore, reg, val);
intel_uncore_posting_read_fw(uncore, 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 *uncore = &fence->i915->uncore;
i915_reg_t reg = FENCE_REG(fence->id);
I915_WRITE(reg, val);
POSTING_READ(reg);
intel_uncore_write_fw(uncore, reg, val);
intel_uncore_posting_read_fw(uncore, 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 @@ out_unpin:
/**
* 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 *uncore = &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(uncore, 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(uncore, MAD_DIMM_C0);
dimm_c1 = intel_uncore_read(uncore, 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(uncore, C0DRB3) ==
intel_uncore_read(uncore, C1DRB3)) {
swizzle_x = I915_BIT_6_SWIZZLE_9_10;
swizzle_y = I915_BIT_6_SWIZZLE_9;
}
} else {
u32 dcc;
u32 dcc = intel_uncore_read(uncore, 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(uncore, 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;
}
/*