Re: [Intel-gfx] [PATCH 1/7] drm/i915/guc: Add a helper for log buffer size

Teres Alexis, Alan Previn
2022-08-02T17:37:26Z

Something minor in comments, so conditional R-B (please fix on the way in or reply to correct me):

Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>

On Wed, 2022-07-27 at 19:20 -0700, Harrison, John C wrote:
> From: Alan Previn <alan.previn.teres.alexis@intel.com>
>
> Add a helper to get GuC log buffer size.
>
> Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
> Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
> Reviewed-by: Matthew Brost <matthew.brost@intel.com>
> ---
> drivers/gpu/drm/i915/gt/uc/intel_guc_log.c | 49 ++++++++++++----------
> 1 file changed, 27 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> index 25b2d7ce6640d..492bbf419d4df 100644
> --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
> @@ -15,6 +15,32 @@
>
> static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log);
>
> +static u32 intel_guc_log_size(struct intel_guc_log *log)
> +{
> + /*
> + * GuC Log buffer Layout:
> + *
> + * NB: Ordering must follow "enum guc_log_buffer_type".
> + *
> + * +===============================+ 00B
> + * | Debug state header |
> + * +-------------------------------+ 32B
>
Something we might have missed in prior updates but i think the bufer state is now 36 bytes long no? (9 dwords).

> + * | Crash dump state header |
> + * +-------------------------------+ 64B
> + * | Capture state header |
> + * +-------------------------------+ 96B
> + * | |
> + * +===============================+ PAGE_SIZE (4KB)
> + * | Debug logs |
> + * +===============================+ + DEBUG_SIZE
> + * | Crash Dump logs |
> + * +===============================+ + CRASH_SIZE
> + * | Capture logs |
> + * +===============================+ + CAPTURE_SIZE
> + */
> + return PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE + CAPTURE_BUFFER_SIZE;
> +}
> +
> /**
> * DOC: GuC firmware log
> *
> @@ -461,32 +487,11 @@ int intel_guc_log_create(struct intel_guc_log *log)
>
> GEM_BUG_ON(log->vma);
>
> - /*
> - * GuC Log buffer Layout
> - * (this ordering must follow "enum guc_log_buffer_type" definition)
> - *
> - * +===============================+ 00B
> - * | Debug state header |
> - * +-------------------------------+ 32B
> - * | Crash dump state header |
> - * +-------------------------------+ 64B
> - * | Capture state header |
> - * +-------------------------------+ 96B
> - * | |
> - * +===============================+ PAGE_SIZE (4KB)
> - * | Debug logs |
> - * +===============================+ + DEBUG_SIZE
> - * | Crash Dump logs |
> - * +===============================+ + CRASH_SIZE
> - * | Capture logs |
> - * +===============================+ + CAPTURE_SIZE
> - */
> if (intel_guc_capture_output_min_size_est(guc) > CAPTURE_BUFFER_SIZE)
> DRM_WARN("GuC log buffer for state_capture maybe too small. %d < %d\n",
> CAPTURE_BUFFER_SIZE, intel_guc_capture_output_min_size_est(guc));
>
> - guc_log_size = PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE +
> - CAPTURE_BUFFER_SIZE;
> + guc_log_size = intel_guc_log_size(log);
>
> vma = intel_guc_allocate_vma(guc, guc_log_size);
> if (IS_ERR(vma)) {
> --
> 2.37.1
>