| Message ID | 20241111134720.780403-1-akash.goel@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm/panthor: Fix handling of partial GPU mapping of BOs | expand |
On Mon, 11 Nov 2024 13:47:20 +0000 Akash Goel <akash.goel@arm.com> wrote: > This commit fixes the bug in the handling of partial mapping of the > buffer objects to the GPU, which caused kernel warnings. > > Panthor didn't correctly handle the case where the partial mapping > spanned multiple scatterlists and the mapping offset didn't point > to the 1st page of starting scatterlist. The offset variable was > not cleared after reaching the starting scatterlist. > > Following warning messages were seen. > WARNING: CPU: 1 PID: 650 at drivers/iommu/io-pgtable-arm.c:659 __arm_lpae_unmap+0x254/0x5a0 > <snip> > pc : __arm_lpae_unmap+0x254/0x5a0 > lr : __arm_lpae_unmap+0x2cc/0x5a0 > <snip> > Call trace: > __arm_lpae_unmap+0x254/0x5a0 > __arm_lpae_unmap+0x108/0x5a0 > __arm_lpae_unmap+0x108/0x5a0 > __arm_lpae_unmap+0x108/0x5a0 > arm_lpae_unmap_pages+0x80/0xa0 > panthor_vm_unmap_pages+0xac/0x1c8 [panthor] > panthor_gpuva_sm_step_unmap+0x4c/0xc8 [panthor] > op_unmap_cb.isra.23.constprop.30+0x54/0x80 > __drm_gpuvm_sm_unmap+0x184/0x1c8 > drm_gpuvm_sm_unmap+0x40/0x60 > panthor_vm_exec_op+0xa8/0x120 [panthor] > panthor_vm_bind_exec_sync_op+0xc4/0xe8 [panthor] > panthor_ioctl_vm_bind+0x10c/0x170 [panthor] > drm_ioctl_kernel+0xbc/0x138 > drm_ioctl+0x210/0x4b0 > __arm64_sys_ioctl+0xb0/0xf8 > invoke_syscall+0x4c/0x110 > el0_svc_common.constprop.1+0x98/0xf8 > do_el0_svc+0x24/0x38 > el0_svc+0x34/0xc8 > el0t_64_sync_handler+0xa0/0xc8 > el0t_64_sync+0x174/0x178 > <snip> > panthor : [drm] drm_WARN_ON(unmapped_sz != pgsize * pgcount) > WARNING: CPU: 1 PID: 650 at drivers/gpu/drm/panthor/panthor_mmu.c:922 panthor_vm_unmap_pages+0x124/0x1c8 [panthor] > <snip> > pc : panthor_vm_unmap_pages+0x124/0x1c8 [panthor] > lr : panthor_vm_unmap_pages+0x124/0x1c8 [panthor] > <snip> > panthor : [drm] *ERROR* failed to unmap range ffffa388f000-ffffa3890000 (requested range ffffa388c000-ffffa3890000) > > Fixes: 647810ec2476 ("drm/panthor: Add the MMU/VM logical block") > Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> > Reviewed-by: Steven Price <steven.price@arm.com> > Signed-off-by: Akash Goel <akash.goel@arm.com> Oops, sorry, didn't notice the v2 before adding my R-b on v1. Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com> > --- > drivers/gpu/drm/panthor/panthor_mmu.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c > index d8cc9e7d064e..8d05124793f5 100644 > --- a/drivers/gpu/drm/panthor/panthor_mmu.c > +++ b/drivers/gpu/drm/panthor/panthor_mmu.c > @@ -989,6 +989,8 @@ panthor_vm_map_pages(struct panthor_vm *vm, u64 iova, int prot, > > if (!size) > break; > + > + offset = 0; > } > > return panthor_vm_flush_range(vm, start_iova, iova - start_iova);
diff --git a/drivers/gpu/drm/panthor/panthor_mmu.c b/drivers/gpu/drm/panthor/panthor_mmu.c index d8cc9e7d064e..8d05124793f5 100644 --- a/drivers/gpu/drm/panthor/panthor_mmu.c +++ b/drivers/gpu/drm/panthor/panthor_mmu.c @@ -989,6 +989,8 @@ panthor_vm_map_pages(struct panthor_vm *vm, u64 iova, int prot, if (!size) break; + + offset = 0; } return panthor_vm_flush_range(vm, start_iova, iova - start_iova);
This commit fixes the bug in the handling of partial mapping of the buffer objects to the GPU, which caused kernel warnings. Panthor didn't correctly handle the case where the partial mapping spanned multiple scatterlists and the mapping offset didn't point to the 1st page of starting scatterlist. The offset variable was not cleared after reaching the starting scatterlist. Following warning messages were seen. WARNING: CPU: 1 PID: 650 at drivers/iommu/io-pgtable-arm.c:659 __arm_lpae_unmap+0x254/0x5a0 <snip> pc : __arm_lpae_unmap+0x254/0x5a0 lr : __arm_lpae_unmap+0x2cc/0x5a0 <snip> Call trace: __arm_lpae_unmap+0x254/0x5a0 __arm_lpae_unmap+0x108/0x5a0 __arm_lpae_unmap+0x108/0x5a0 __arm_lpae_unmap+0x108/0x5a0 arm_lpae_unmap_pages+0x80/0xa0 panthor_vm_unmap_pages+0xac/0x1c8 [panthor] panthor_gpuva_sm_step_unmap+0x4c/0xc8 [panthor] op_unmap_cb.isra.23.constprop.30+0x54/0x80 __drm_gpuvm_sm_unmap+0x184/0x1c8 drm_gpuvm_sm_unmap+0x40/0x60 panthor_vm_exec_op+0xa8/0x120 [panthor] panthor_vm_bind_exec_sync_op+0xc4/0xe8 [panthor] panthor_ioctl_vm_bind+0x10c/0x170 [panthor] drm_ioctl_kernel+0xbc/0x138 drm_ioctl+0x210/0x4b0 __arm64_sys_ioctl+0xb0/0xf8 invoke_syscall+0x4c/0x110 el0_svc_common.constprop.1+0x98/0xf8 do_el0_svc+0x24/0x38 el0_svc+0x34/0xc8 el0t_64_sync_handler+0xa0/0xc8 el0t_64_sync+0x174/0x178 <snip> panthor : [drm] drm_WARN_ON(unmapped_sz != pgsize * pgcount) WARNING: CPU: 1 PID: 650 at drivers/gpu/drm/panthor/panthor_mmu.c:922 panthor_vm_unmap_pages+0x124/0x1c8 [panthor] <snip> pc : panthor_vm_unmap_pages+0x124/0x1c8 [panthor] lr : panthor_vm_unmap_pages+0x124/0x1c8 [panthor] <snip> panthor : [drm] *ERROR* failed to unmap range ffffa388f000-ffffa3890000 (requested range ffffa388c000-ffffa3890000) Fixes: 647810ec2476 ("drm/panthor: Add the MMU/VM logical block") Reviewed-by: Liviu Dudau <liviu.dudau@arm.com> Reviewed-by: Steven Price <steven.price@arm.com> Signed-off-by: Akash Goel <akash.goel@arm.com> --- drivers/gpu/drm/panthor/panthor_mmu.c | 2 ++ 1 file changed, 2 insertions(+)