51 lines
1.1 KiB
Plaintext
51 lines
1.1 KiB
Plaintext
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#!/usr/bin/env bash
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# We simply check if BAR2 is present as that's where PMR or CMB is
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# meant to be located under qemu. If found, print some stats then exit.
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[[ $(uname -s) == Linux ]] || exit 0
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# Use MSR instead?
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[[ $(< /sys/class/dmi/id/chassis_vendor) == QEMU ]] || exit 0
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get_bar2() {
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echo "0x$(setpci -s "$1" 0x18.L)"
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}
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get_size() {
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local addr=$1
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local start end type
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while IFS="- " read -r start end type; do
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start=0x$start end=0x$end
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if ((start == addr)) && [[ $type == *"$pci"* ]]; then
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printf '0x%08x:0x%08x:0x%08x\n' \
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"$start" "$end" $((end - start + 1))
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return 0
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fi
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done < /proc/iomem
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echo "unknown"
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}
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info() {
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local bar=$1
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local pref loc
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pref[0]=non-prefetchable
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pref[1]=prefetchable
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loc[0]=32-bit
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loc[1]="<1MiB"
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loc[2]=64-bit
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echo "${loc[(bar >> 1) & 0x3]}:${pref[bar & 1 << 3 ? 1 : 0]}:$(get_size $((bar & ~0xf)))"
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}
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for nvme in /sys/class/nvme/nvme*; do
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pci=$(readlink -f "$nvme/device") pci=${pci##*/}
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bar2=$(get_bar2 "$pci") || continue
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((bar2 != 0x0)) || continue
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bar=pmr
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[[ -e $nvme/cmb ]] && bar=cmb
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echo "${nvme##*/}:$pci:$(info "$bar2"):$bar"
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done
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