On Wed, Sep 02, 2020 at 02:42:05PM -0400, Andrey Grodzovsky wrote:
> Wait for HW/PSP initiated ASIC reset to complete before
> starting the recovery operations.
>
> v2: Remove typo
>
> Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@xxxxxxx>
> Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 22 ++++++++++++++++++++--
> 1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> index e999f1f..412d07e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
> @@ -4838,14 +4838,32 @@ pci_ers_result_t amdgpu_pci_slot_reset(struct pci_dev *pdev)
> {
> struct drm_device *dev = pci_get_drvdata(pdev);
> struct amdgpu_device *adev = drm_to_adev(dev);
> - int r;
> + int r, i;
> bool vram_lost;
> + u32 memsize;
>
> DRM_INFO("PCI error: slot reset callback!!\n");
>
> + /* wait for asic to come out of reset */
I know it's totally OCD, but it is a minor speed bump to read "asic"
here and "ASIC" in the commit log above and the new comment below.
> + msleep(500);
> +
> pci_restore_state(pdev);
>
> - adev->in_pci_err_recovery = true;
> + /* confirm ASIC came out of reset */
> + for (i = 0; i < adev->usec_timeout; i++) {
> + memsize = amdgpu_asic_get_config_memsize(adev);
> +
> + if (memsize != 0xffffffff)
I guess this is a spot where you actually depend on an MMIO read
returning 0xffffffff because adev->in_pci_err_recovery is false at
this point, so amdgpu_mm_rreg() will actually *do* the MMIO read
instead of returning 0. Right?
> + break;
> + udelay(1);
> + }
> + if (memsize == 0xffffffff) {
> + r = -ETIME;
> + goto out;
> + }
> +
> + /* TODO Call amdgpu_pre_asic_reset instead */
> + adev->in_pci_err_recovery = true;
> r = amdgpu_device_ip_suspend(adev);
> adev->in_pci_err_recovery = false;
> if (r)
> --
> 2.7.4
>
