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drm/i915: Add PPGTT dumper

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Dump the aliasing PPGTT with it. The aliasing PPGTT should actually
always be empty.

TODO: Broadwell. Since we don't yet use full PPGTT on Broadwell, not
having the dumper is okay.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-12-06 14:11:29 -08:00 committed by Daniel Vetter
parent d2ff7192f3
commit 87d60b63e0
3 changed files with 59 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -1704,6 +1704,7 @@ static void gen6_ppgtt_info(struct seq_file *m, struct drm_device *dev)
seq_puts(m, "aliasing PPGTT:\n");
seq_printf(m, "pd gtt offset: 0x%08x\n", ppgtt->pd_offset);
ppgtt->debug_dump(ppgtt, m);
}
seq_printf(m, "ECOCHK: 0x%08x\n", I915_READ(GAM_ECOCHK));
}

1
drivers/gpu/drm/i915/i915_drv.h
View File

@ -678,6 +678,7 @@ struct i915_hw_ppgtt {
int (*switch_mm)(struct i915_hw_ppgtt *ppgtt,
struct intel_ring_buffer *ring,
bool synchronous);
void (*debug_dump)(struct i915_hw_ppgtt *ppgtt, struct seq_file *m);
};
struct i915_ctx_hang_stats {

57
drivers/gpu/drm/i915/i915_gem_gtt.c
View File

@ -460,6 +460,62 @@ err_out:
return ret;
}
static void gen6_dump_ppgtt(struct i915_hw_ppgtt *ppgtt, struct seq_file *m)
{
struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private;
struct i915_address_space *vm = &ppgtt->base;
gen6_gtt_pte_t __iomem *pd_addr;
gen6_gtt_pte_t scratch_pte;
uint32_t pd_entry;
int pte, pde;
scratch_pte = vm->pte_encode(vm->scratch.addr, I915_CACHE_LLC, true);
pd_addr = (gen6_gtt_pte_t __iomem *)dev_priv->gtt.gsm +
ppgtt->pd_offset / sizeof(gen6_gtt_pte_t);
seq_printf(m, " VM %p (pd_offset %x-%x):\n", vm,
ppgtt->pd_offset, ppgtt->pd_offset + ppgtt->num_pd_entries);
for (pde = 0; pde < ppgtt->num_pd_entries; pde++) {
u32 expected;
gen6_gtt_pte_t *pt_vaddr;
dma_addr_t pt_addr = ppgtt->pt_dma_addr[pde];
pd_entry = readl(pd_addr + pde);
expected = (GEN6_PDE_ADDR_ENCODE(pt_addr) | GEN6_PDE_VALID);
if (pd_entry != expected)
seq_printf(m, "\tPDE #%d mismatch: Actual PDE: %x Expected PDE: %x\n",
pde,
pd_entry,
expected);
seq_printf(m, "\tPDE: %x\n", pd_entry);
pt_vaddr = kmap_atomic(ppgtt->pt_pages[pde]);
for (pte = 0; pte < I915_PPGTT_PT_ENTRIES; pte+=4) {
unsigned long va =
(pde * PAGE_SIZE * I915_PPGTT_PT_ENTRIES) +
(pte * PAGE_SIZE);
int i;
bool found = false;
for (i = 0; i < 4; i++)
if (pt_vaddr[pte + i] != scratch_pte)
found = true;
if (!found)
continue;
seq_printf(m, "\t\t0x%lx [%03d,%04d]: =", va, pde, pte);
for (i = 0; i < 4; i++) {
if (pt_vaddr[pte + i] != scratch_pte)
seq_printf(m, " %08x", pt_vaddr[pte + i]);
else
seq_puts(m, " SCRATCH ");
}
seq_puts(m, "\n");
}
kunmap_atomic(pt_vaddr);
}
}
static void gen6_write_pdes(struct i915_hw_ppgtt *ppgtt)
{
struct drm_i915_private *dev_priv = ppgtt->base.dev->dev_private;
@ -873,6 +929,7 @@ alloc:
ppgtt->base.clear_range(&ppgtt->base, 0,
ppgtt->num_pd_entries * I915_PPGTT_PT_ENTRIES, true);
ppgtt->debug_dump = gen6_dump_ppgtt;
DRM_DEBUG_DRIVER("Allocated pde space (%ldM) at GTT entry: %lx\n",
ppgtt->node.size >> 20,