summaryrefslogtreecommitdiff
path: root/util/hda-decoder/description.md
diff options
context:
space:
mode:
authorShuo Liu <shuo.liu@intel.com>2024-07-16 18:41:28 +0800
committerLean Sheng Tan <sheng.tan@9elements.com>2024-09-09 09:16:56 +0000
commit42c5c6de9531c017b679d75ab56c9f7160cac23e (patch)
tree931c9a4b1cb81f1bc30bc74151489fb6f5b683e2 /util/hda-decoder/description.md
parentae8e568c46292787278411c51b29e68b470cad98 (diff)
soc/intel/xeon_sp: Reserve MMIO high range
Xeon-SP supports MMIO high range, a.k.a. MMIO range above 4G. FSP will assign domain MMIO high windows from this range. However, there will be unassigned parts among these high windows for non-domain device usage (e.g. misc devices belonging to an IIO stack but not belonged to any PCIe domains under that stack). This will cause segmentation in MTRR UC coverage. For example, in SPR-XCC where only CPM0/HQM0 are supported and instantiated to PCIe domains, MMIO ranges are still reserved for CPM1/HQM1. See more at src/soc/intel/xeon_sp/spr/ioat.c. Reserve MMIO high range as a whole under domain0/00:0.0. During MTRR calculation, this reservation will connect the discontinued domain MMIO high windows together to form one continuous range, and save MTRR register usage from inadequacy. This change is initially raised for SPR but could be effective for GNR as well. TESTED = Build and boot in intel/archercity CRB, MTRR register usage decreases from 7 to 3 in 2S system. TESTED = Only setting MTRR for below 4GB ranges test fails with LinuxBoot on SPR (through x86_setup_mtrrs_with_detect_no_above_4gb) tsc: Detected 2000.000 MHz processor last_pfn = 0x2080000 max_arch_pfn = 0x10000000000 x86/PAT: Configuration [0-7]: WB WC UC- UC WB WP UC- WT WARNING: BIOS bug: CPU MTRRs don't cover all of memory, losing 129024MB of RAM. ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at arch/x86/kernel/cpu/mtrr/cleanup.c:978 mtrr_trim_uncached_memory+0x2b9/0x2f9 ... Call Trace: ? 0xffffffff8f600000 ? setup_arch+0x4bb/0xaed ? printk+0x53/0x6a ? start_kernel+0x55/0x507 ? load_ucode_intel_bsp+0x1c/0x4d ? secondary_startup_64_no_verify+0xc2/0xcb random: get_random_bytes called from init_oops_id+0x1d/0x2c with crng_init=0 ---[ end trace 0e56686fd458f0c5 ]--- update e820 for mtrr modified physical RAM map: modified: [mem 0x0000000000000000-0x0000000000000fff] reserved ... modified: [mem 0x00000000ff000000-0x000000207fffffff] reserved last_pfn = 0x6354e max_arch_pfn = 0x10000000000 Memory KASLR using RDRAND RDTSC... x2apic: enabled by BIOS, switching to x2apic ops Using GB pages for direct mapping ... Initmem setup node 0 [mem 0x0000000000001000-0x000000006354dfff] DMA zone: 28769 pages in unavailable ranges DMA32 zone: 19122 pages in unavailable ranges BUG: unable to handle page fault for address: ff24b56eba60cff8 BAD Oops: 0000 [#1] SMP NOPTI CPU: 0 PID: 0 Comm: swapper Tainted: G W 5.10.50 #2 ... Call Trace: ? set_pte_vaddr_p4d+0x24/0x35 ? __native_set_fixmap+0x21/0x28 ? map_vsyscall+0x35/0x56 ? setup_arch+0xa00/0xaed ? printk+0x53/0x6a ? start_kernel+0x55/0x507 ? load_ucode_intel_bsp+0x1c/0x4d ? secondary_startup_64_no_verify+0xc2/0xcb CR2: ff24b56eba60cff8 ---[ end trace 0e56686fd458f0c6 ]--- RIP: 0010:fill_pud+0xa/0x62 ... Kernel panic - not syncing: Attempted to kill the idle task! ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- Change-Id: Ib2a0e1f1f13e797c1fab6aca589d060c4d3fa15b Signed-off-by: Shuo Liu <shuo.liu@intel.com> Reviewed-on: https://review.coreboot.org/c/coreboot/+/83538 Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'util/hda-decoder/description.md')
0 files changed, 0 insertions, 0 deletions