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gpu: nvgpu: Fix TLB invalidate race

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TLB invalidate can have a race if several contexts use the same
address space. One thread starting an invalidate allows another
thread to submit before invalidate is completed.

Bug 1502332

Change-Id: I074ec493eac3b153c5f23d796a1dee1d8db24855
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/407578
Reviewed-by: Riham Haidar <rhaidar@nvidia.com>
Tested-by: Riham Haidar <rhaidar@nvidia.com>
This commit is contained in:
Terje Bergstrom
2014-05-08 14:43:27 +03:00
committed by Dan Willemsen
parent 4ac110cb8a
commit c8a5d3f908
3 changed files with 9 additions and 17 deletions
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7
drivers/gpu/nvgpu/gk20a/channel_gk20a.c
View File

@@ -1575,13 +1575,6 @@ static int gk20a_submit_channel_gpfifo(struct channel_gk20a *c,
incr_cmd->gp_put = c->gpfifo.put;
}
/* Invalidate tlb if it's dirty... */
/* TBD: this should be done in the cmd stream, not with PRIs. */
/* We don't know what context is currently running... */
/* Note also: there can be more than one context associated with the */
/* address space (vm). */
gk20a_mm_tlb_invalidate(c->vm);
trace_gk20a_channel_submitted_gpfifo(c->g->dev->name,
c->hw_chid,
num_entries,

18
drivers/gpu/nvgpu/gk20a/mm_gk20a.c
View File

@@ -298,7 +298,6 @@ int gk20a_init_mm_setup_sw(struct gk20a *g)
}
mm->g = g;
mutex_init(&mm->tlb_lock);
mutex_init(&mm->l2_op_lock);
mm->big_page_size = gmmu_page_sizes[gmmu_page_size_big];
mm->compression_page_size = gmmu_page_sizes[gmmu_page_size_big];
@@ -2892,11 +2891,11 @@ int gk20a_vm_find_buffer(struct vm_gk20a *vm, u64 gpu_va,
void gk20a_mm_tlb_invalidate(struct vm_gk20a *vm)
{
struct mm_gk20a *mm = vm->mm;
struct gk20a *g = gk20a_from_vm(vm);
u32 addr_lo = u64_lo32(gk20a_mm_iova_addr(vm->pdes.sgt->sgl) >> 12);
u32 data;
s32 retry = 200;
static DEFINE_MUTEX(tlb_lock);
gk20a_dbg_fn("");
@@ -2915,10 +2914,8 @@ void gk20a_mm_tlb_invalidate(struct vm_gk20a *vm)
mutex_unlock(&vm->update_gmmu_lock);
return;
}
vm->tlb_dirty = false;
mutex_unlock(&vm->update_gmmu_lock);
mutex_lock(&mm->tlb_lock);
mutex_lock(&tlb_lock);
do {
data = gk20a_readl(g, fb_mmu_ctrl_r());
if (fb_mmu_ctrl_pri_fifo_space_v(data) != 0)
@@ -2927,17 +2924,17 @@ void gk20a_mm_tlb_invalidate(struct vm_gk20a *vm)
retry--;
} while (retry >= 0 || !tegra_platform_is_silicon());
if (retry < 0)
if (retry < 0) {
gk20a_warn(dev_from_gk20a(g),
"wait mmu fifo space too many retries");
goto out;
}
gk20a_writel(g, fb_mmu_invalidate_pdb_r(),
fb_mmu_invalidate_pdb_addr_f(addr_lo) |
fb_mmu_invalidate_pdb_aperture_vid_mem_f());
/* this is a sledgehammer, it would seem */
gk20a_writel(g, fb_mmu_invalidate_r(),
fb_mmu_invalidate_all_pdb_true_f() |
fb_mmu_invalidate_all_va_true_f() |
fb_mmu_invalidate_trigger_true_f());
@@ -2954,7 +2951,10 @@ void gk20a_mm_tlb_invalidate(struct vm_gk20a *vm)
gk20a_warn(dev_from_gk20a(g),
"mmu invalidate too many retries");
mutex_unlock(&mm->tlb_lock);
out:
mutex_unlock(&tlb_lock);
vm->tlb_dirty = false;
mutex_unlock(&vm->update_gmmu_lock);
}
int gk20a_mm_suspend(struct gk20a *g)

1
drivers/gpu/nvgpu/gk20a/mm_gk20a.h
View File

@@ -322,7 +322,6 @@ struct mm_gk20a {
struct inst_desc inst_block;
} pmu;
struct mutex tlb_lock;
struct mutex l2_op_lock;
void (*remove_support)(struct mm_gk20a *mm);