Commit be658e70 authored by CQ Tang's avatar CQ Tang Committed by Matthew Auld
Browse files

drm/i915: add lmem_size modparam 



lmem_size is used to limit the amount of lmem for testing purposes.
Default is to use hardware available lmem size.

Signed-off-by: default avatarCQ Tang <cq.tang@intel.com>
Signed-off-by: default avatarMatthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Nirmoy Das <nirmoy.das@linux.intel.com>
Reviewed-by: default avatarNirmoy Das <nirmoy.das@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220324143123.348590-2-matthew.auld@intel.com
parent c0c73850

drivers/gpu/drm/i915/gt/intel_region_lmem.c

+4 −0
Original line number Diff line number Diff line
@@ -123,6 +123,10 @@ static struct intel_memory_region *setup_lmem(struct intel_gt *gt) 
		lmem_size = intel_uncore_read64(&i915->uncore, GEN12_GSMBASE);

	}



	if (i915->params.lmem_size > 0) {

		lmem_size = min_t(resource_size_t, lmem_size,

				  mul_u32_u32(i915->params.lmem_size, SZ_1M));

	}



	io_start = pci_resource_start(pdev, 2);

	io_size = min(pci_resource_len(pdev, 2), lmem_size);

drivers/gpu/drm/i915/i915_params.c

+3 −0
Original line number Diff line number Diff line
@@ -200,6 +200,9 @@ i915_param_named_unsafe(request_timeout_ms, uint, 0600, 
			"Default request/fence/batch buffer expiration timeout.");

#endif



i915_param_named_unsafe(lmem_size, uint, 0400,

			"Set the lmem size(in MiB) for each region. (default: 0, all memory)");



static __always_inline void _print_param(struct drm_printer *p,

					 const char *name,

					 const char *type,

drivers/gpu/drm/i915/i915_params.h

+1 −0
Original line number Diff line number Diff line
@@ -73,6 +73,7 @@ struct drm_printer; 
	param(int, enable_dpcd_backlight, -1, 0600) \

	param(char *, force_probe, CONFIG_DRM_I915_FORCE_PROBE, 0400) \

	param(unsigned int, request_timeout_ms, CONFIG_DRM_I915_REQUEST_TIMEOUT, CONFIG_DRM_I915_REQUEST_TIMEOUT ? 0600 : 0) \

	param(unsigned int, lmem_size, 0, 0400) \

	/* leave bools at the end to not create holes */ \

	param(bool, enable_hangcheck, true, 0600) \

	param(bool, load_detect_test, false, 0600) \