From df074ee3defffed9aaaa09928c24ec4abb166a9d Mon Sep 17 00:00:00 2001
From: Pingfan Liu <piliu@redhat.com>
Date: Jun 15 2023 02:35:43 +0000
Subject: kdump-lib: Evaluate the memory consumption by smmu and mlx5 separately


Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=2160676
Upstream: Fedora rawhide
Conflict: None

commit 7a2c4cbc3b10971c2a465ba2e465761e73390b74
Author: Pingfan Liu <piliu@redhat.com>
Date:   Tue Jun 13 17:43:23 2023 +0800

    kdump-lib: Evaluate the memory consumption by smmu and mlx5 separately

    On 4k and 64k kernels, the typical consumption values for SMMU are 36MB
    and 384MB, respectively. Hence for 64k kernel, the consumption by smmu
    should be taken into account carefully.

    To do it by adding the extra 384MB value if installing a 64k kernel.
    The upper limit value 384MB is calculated according to the formula in
    the kernel smmu driver.

    As for mlx5 network cards, it is measured by a pratical test, 200M for
    64k variant, 150M for 4k variant

    Signed-off-by: Pingfan Liu <piliu@redhat.com>
    Reviewed-by: Coiby Xu <coxu@redhat.com>
    Reviewed-by: Philipp Rudo <prudo@redhat.com>

Signed-off-by: Pingfan Liu <piliu@redhat.com>

---

diff --git a/kdump-lib.sh b/kdump-lib.sh
index 474811c..bc4cedf 100755
--- a/kdump-lib.sh
+++ b/kdump-lib.sh
@@ -947,6 +947,16 @@ get_recommend_size()
 	echo "0M"
 }
 
+has_mlx5()
+{
+	[[ -d /sys/bus/pci/drivers/mlx5_core ]]
+}
+
+has_aarch64_smmu()
+{
+	ls /sys/devices/platform/arm-smmu-* 1> /dev/null 2>&1
+}
+
 # $1 crashkernel=""
 # $2 delta in unit of MB
 _crashkernel_add()
@@ -1043,8 +1053,14 @@ kdump_get_arch_recommend_crashkernel()
 			# Without smmu, the diff of MemFree between 4K and 64K measured on a high end aarch64 machine is 82M.
 			# Picking up 100M to cover this diff. And finally, we have "1G-4G:356M;4G-64G:420M;64G-:676M"
 			((_delta += 100))
+			# On a 64K system, the extra 384MB is calculated by: cmdq_num * 16 bytes + evtq_num * 32B + priq_num * 16B
+			# While on a 4K system, it is negligible
+			has_aarch64_smmu && ((_delta += 384))
+			#64k kernel, mlx5 consumes extra 188M memory, and choose 200M
+			has_mlx5 && ((_delta += 200))
 		else
-			((_delta += 0))
+			#4k kernel, mlx5 consumes extra 124M memory, and choose 150M
+			has_mlx5 && ((_delta += 150))
 		fi
 		_ck_cmdline=$(_crashkernel_add "$_ck_cmdline" "$_delta")
 	elif [[ $_arch == "ppc64le" ]]; then