From 27600805e62f800bacf990354632eae4e487d34c Mon Sep 17 00:00:00 2001 From: Yazen Ghannam Date: Thu, 3 Sep 2026 10:43:25 -0500 Subject: x86/amd_node: Fix PCI device reference counting in amd_smn_init() The local "root" pointer is a temporary variable used during the device search. Therefore, refcount related to the search iterators should be cleaned up after the search is complete. Use the __free() cleanup macro to ensure the refcount is decremented when the temporary pointer goes out of scope. Additionally, increment the refcount when caching a root pointer. This ensures the in-use refcount is separate from the temporary search refcounting. Finally, drop the redundant "root = NULL" before the second search loop. The pci_get_class() iterator always decrements the refcount of its "from" argument, so the first loop can only fall through with "root" already NULL. Fixes: 0a4b61d9c2e4 ("x86/amd_node: Fix AMD root device caching") Closes: https://sashiko.dev/#/patchset/20260806160159.230453-1-jason.andryuk%40amd.com Reported-by: Sashiko Assisted-by: LLM Signed-off-by: Yazen Ghannam Signed-off-by: Borislav Petkov (AMD) Reviewed-by: Mario Limonciello (AMD) Cc: Link: https://patch.msgid.link/20260903154325.74343-1-yazen.ghannam@amd.com --- arch/arm/lib/memset.S | 148 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 148 insertions(+) create mode 100644 arch/arm/lib/memset.S (limited to 'arch/arm/lib/memset.S') diff --git a/arch/arm/lib/memset.S b/arch/arm/lib/memset.S new file mode 100644 index 000000000..de75ae4d5 --- /dev/null +++ b/arch/arm/lib/memset.S @@ -0,0 +1,148 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/lib/memset.S + * + * Copyright (C) 1995-2000 Russell King + * + * ASM optimised string functions + */ +#include +#include +#include + + .text + .align 5 + +ENTRY(__memset) +ENTRY(mmioset) +WEAK(memset) +UNWIND( .fnstart ) + and r1, r1, #255 @ cast to unsigned char + ands r3, r0, #3 @ 1 unaligned? + mov ip, r0 @ preserve r0 as return value + bne 6f @ 1 +/* + * we know that the pointer in ip is aligned to a word boundary. + */ +1: orr r1, r1, r1, lsl #8 + orr r1, r1, r1, lsl #16 + mov r3, r1 +7: cmp r2, #16 + blt 4f +UNWIND( .fnend ) + +#if ! CALGN(1)+0 + +/* + * We need 2 extra registers for this loop - use r8 and the LR + */ +UNWIND( .fnstart ) +UNWIND( .save {r8, lr} ) + stmfd sp!, {r8, lr} + mov r8, r1 + mov lr, r3 + +2: subs r2, r2, #64 + stmiage ip!, {r1, r3, r8, lr} @ 64 bytes at a time. + stmiage ip!, {r1, r3, r8, lr} + stmiage ip!, {r1, r3, r8, lr} + stmiage ip!, {r1, r3, r8, lr} + bgt 2b + ldmfdeq sp!, {r8, pc} @ Now <64 bytes to go. +/* + * No need to correct the count; we're only testing bits from now on + */ + tst r2, #32 + stmiane ip!, {r1, r3, r8, lr} + stmiane ip!, {r1, r3, r8, lr} + tst r2, #16 + stmiane ip!, {r1, r3, r8, lr} + ldmfd sp!, {r8, lr} +UNWIND( .fnend ) + +#else + +/* + * This version aligns the destination pointer in order to write + * whole cache lines at once. + */ + +UNWIND( .fnstart ) +UNWIND( .save {r4-r8, lr} ) + stmfd sp!, {r4-r8, lr} + mov r4, r1 + mov r5, r3 + mov r6, r1 + mov r7, r3 + mov r8, r1 + mov lr, r3 + + cmp r2, #96 + tstgt ip, #31 + ble 3f + + and r8, ip, #31 + rsb r8, r8, #32 + sub r2, r2, r8 + movs r8, r8, lsl #(32 - 4) + stmiacs ip!, {r4, r5, r6, r7} + stmiami ip!, {r4, r5} + tst r8, #(1 << 30) + mov r8, r1 + strne r1, [ip], #4 + +3: subs r2, r2, #64 + stmiage ip!, {r1, r3-r8, lr} + stmiage ip!, {r1, r3-r8, lr} + bgt 3b + ldmfdeq sp!, {r4-r8, pc} + + tst r2, #32 + stmiane ip!, {r1, r3-r8, lr} + tst r2, #16 + stmiane ip!, {r4-r7} + ldmfd sp!, {r4-r8, lr} +UNWIND( .fnend ) + +#endif + +UNWIND( .fnstart ) +4: tst r2, #8 + stmiane ip!, {r1, r3} + tst r2, #4 + strne r1, [ip], #4 +/* + * When we get here, we've got less than 4 bytes to set. We + * may have an unaligned pointer as well. + */ +5: tst r2, #2 + strbne r1, [ip], #1 + strbne r1, [ip], #1 + tst r2, #1 + strbne r1, [ip], #1 + ret lr + +6: subs r2, r2, #4 @ 1 do we have enough + blt 5b @ 1 bytes to align with? + cmp r3, #2 @ 1 + strblt r1, [ip], #1 @ 1 + strble r1, [ip], #1 @ 1 + strb r1, [ip], #1 @ 1 + add r2, r2, r3 @ 1 (r2 = r2 - (4 - r3)) + b 1b +UNWIND( .fnend ) +ENDPROC(memset) +ENDPROC(mmioset) +ENDPROC(__memset) + +ENTRY(__memset32) +UNWIND( .fnstart ) + mov r3, r1 @ copy r1 to r3 and fall into memset64 +UNWIND( .fnend ) +ENDPROC(__memset32) +ENTRY(__memset64) +UNWIND( .fnstart ) + mov ip, r0 @ preserve r0 as return value + b 7b @ jump into the middle of memset +UNWIND( .fnend ) +ENDPROC(__memset64) -- cgit v1.3.1