[PATCH v3 23/37] drm/i915: do not map aperture if it is not available.

Matthew Auld
2019-08-09T22:26:29Z

From: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>

Skip both setup and cleanup of the aperture mapping if the HW doesn't
have an aperture bar.

Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 36 ++++++++++++++++++-----------
1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 5bcf71b18e5f..dd28c54527e3 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2795,8 +2795,10 @@ static void ggtt_cleanup_hw(struct i915_ggtt *ggtt)

mutex_unlock(&i915->drm.struct_mutex);

- arch_phys_wc_del(ggtt->mtrr);
- io_mapping_fini(&ggtt->iomap);
+ if (HAS_MAPPABLE_APERTURE(i915)) {
+ arch_phys_wc_del(ggtt->mtrr);
+ io_mapping_fini(&ggtt->iomap);
+ }
}

/**
@@ -2992,10 +2994,13 @@ static int gen8_gmch_probe(struct i915_ggtt *ggtt)
int err;

/* TODO: We're not aware of mappable constraints on gen8 yet */
- ggtt->gmadr =
- (struct resource) DEFINE_RES_MEM(pci_resource_start(pdev, 2),
- pci_resource_len(pdev, 2));
- ggtt->mappable_end = resource_size(&ggtt->gmadr);
+ /* FIXME: We probably need to add do device_info or runtime_info */
+ if (!HAS_LMEM(dev_priv)) {
+ ggtt->gmadr =
+ (struct resource) DEFINE_RES_MEM(pci_resource_start(pdev, 2),
+ pci_resource_len(pdev, 2));
+ ggtt->mappable_end = resource_size(&ggtt->gmadr);
+ }

err = pci_set_dma_mask(pdev, DMA_BIT_MASK(39));
if (!err)
@@ -3220,15 +3225,18 @@ static int ggtt_init_hw(struct i915_ggtt *ggtt)
if (!HAS_LLC(i915) && !HAS_PPGTT(i915))
ggtt->vm.mm.color_adjust = i915_gtt_color_adjust;

- if (!io_mapping_init_wc(&ggtt->iomap,
- ggtt->gmadr.start,
- ggtt->mappable_end)) {
- ggtt->vm.cleanup(&ggtt->vm);
- ret = -EIO;
- goto out;
- }
+ if (HAS_MAPPABLE_APERTURE(i915)) {
+ if (!io_mapping_init_wc(&ggtt->iomap,
+ ggtt->gmadr.start,
+ ggtt->mappable_end)) {
+ ggtt->vm.cleanup(&ggtt->vm);
+ ret = -EIO;
+ goto out;
+ }

- ggtt->mtrr = arch_phys_wc_add(ggtt->gmadr.start, ggtt->mappable_end);
+ ggtt->mtrr = arch_phys_wc_add(ggtt->gmadr.start,
+ ggtt->mappable_end);
+ }

i915_ggtt_init_fences(ggtt);