From 9d0c2ab924eca78c985d10e65651cff49539efb3 Mon Sep 17 00:00:00 2001
From: CQ Tang <cq.tang@intel.com>
Date: Thu, 24 Mar 2022 14:31:23 +0000
Subject: drm/i915: add lmem_size modparam
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Git-commit: be658e705d08d14eb1b7803c89e6964b5d1c5c0a
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225
lmem_size is used to limit the amount of lmem for testing purposes.
Default is to use hardware available lmem size.
Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Nirmoy Das <nirmoy.das@linux.intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220324143123.348590-2-matthew.auld@intel.com
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
drivers/gpu/drm/i915/gt/intel_region_lmem.c | 4 ++++
drivers/gpu/drm/i915/i915_params.c | 3 +++
drivers/gpu/drm/i915/i915_params.h | 1 +
3 files changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/i915/gt/intel_region_lmem.c b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
index 783d81072c3b..f5111c0a0060 100644
--- a/drivers/gpu/drm/i915/gt/intel_region_lmem.c
+++ b/drivers/gpu/drm/i915/gt/intel_region_lmem.c
@@ -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);
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 5ad071e09301..701fbc98afa0 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -202,6 +202,9 @@ 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,
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index c779a6f85c7e..b5e7ea45d191 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -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) \
--
2.38.1