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Tue, 22 Mar 2022 15:28:56 +0200 (EET) X-ICS-AUTH-INFO: Authenticated user: mick@ics.forth.gr at ics.forth.gr From: Nick Kossifidis To: palmer@dabbelt.com, paul.walmsley@sifive.com, aou@eecs.berkeley.edu Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Nick Kossifidis Subject: [PATCH] RISC-V-fixes: relocate DTB if it's outside memory region Date: Tue, 22 Mar 2022 15:28:39 +0200 Message-Id: <20220322132839.3653682-1-mick@ics.forth.gr> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFupiluLIzCtJLcpLzFFi42Lpjp6urCtx3jLJoPGvmMXW37PYLS7vmsNm se1zC5tF87tz7BYvL/cwW7TN4ndg83jz8iWLx+GOL+weDzddYvLYvKTe41LzdXaPz5vkAtii uGxSUnMyy1KL9O0SuDJmrDUsOChQMfX5D5YGxuu8XYycHBICJhJ9u9rZuhi5OIQEjjJKNF/a zQ6RcJO4fX8nK4jNJqApMf/SQRYQW0TAXWL15D9MIDazQL7Eti/nmEFsYQFPie27f4D1sgio SsxauYQRxOYVsJDYu/o/I8RMeYn9B88yQ8QFJU7OfMICMUdeonnrbOYJjDyzkKRmIUktYGRa xSiQWGasl5lcrJeWX1SSoZdetIkRHFyMvjsYb29+q3eIkYmD8RCjBAezkgjvv9/GSUK8KYmV ValF+fFFpTmpxYcYpTlYlMR5Wa7JJAkJpCeWpGanphakFsFkmTg4pRqYuIPyDi+Y9UCNo/Hu uZPGlhda3acaf5UM3CZwpTfsfZnFvg+hFx1sVx7+N+Pay6CEuV3Sct/fN61a8L4ydQWbgHn9 AcGz6hzC0bM5mYPe6Tzam3ni4j15OR82/gNGRy1Eup9Iz42O4clcEbp9hbFhuOG93kO6XafK d9kLydl+uugtdNy1P/hZmHxt2ISNmg9FmV1mev2NdZA68eWoZHjPu01/Nzl8XFckpPKrxiNC dSdf8Pob6+pl4kU2XpslPv+Pw7S0ebXr+e20zliyLvzwpjPxU/zX48/XtETyRy17FBG84Z+U iNKMCtuCWfP0Dttr9axcz3+6a42Y2dLF/7ftlE58fsroTk7ifa+Aw0G+SizFGYmGWsxFxYkA rj6lgJ0CAAA= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220322_062923_081400_F310BDF8 X-CRM114-Status: GOOD ( 15.83 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org In case the DTB provided by the bootloader/BootROM is before the kernel image or outside /memory, we won't be able to access it through the linear mapping, and get a segfault on setup_arch(). Currently OpenSBI relocates DTB but that's not always the case (e.g. if FW_JUMP_FDT_ADDR is not specified), and it's also not the most portable approach since the default FW_JUMP_FDT_ADDR of the generic platform relocates the DTB at a specific offset that may not be available. To avoid this situation copy DTB so that it's visible through the linear mapping. Signed-off-by: Nick Kossifidis --- arch/riscv/mm/init.c | 21 +++++++++++++++++++-- 1 file changed, 19 insertions(+), 2 deletions(-) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 0d588032d..697a9aed4 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -206,8 +206,25 @@ static void __init setup_bootmem(void) * early_init_fdt_reserve_self() since __pa() does * not work for DTB pointers that are fixmap addresses */ - if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) - memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); + if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) { + /* + * In case the DTB is not located in a memory region we won't + * be able to locate it later on via the linear mapping and + * get a segfault when accessing it via __va(dtb_early_pa). + * To avoid this situation copy DTB to a memory region. + * Note that memblock_phys_alloc will also reserve DTB region. + */ + if (!memblock_is_memory(dtb_early_pa)) { + size_t fdt_size = fdt_totalsize(dtb_early_va); + phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE); + void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size); + + memcpy(new_dtb_early_va, dtb_early_va, fdt_size); + early_memunmap(new_dtb_early_va, fdt_size); + _dtb_early_pa = new_dtb_early_pa; + } else + memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); + } early_init_fdt_scan_reserved_mem(); dma_contiguous_reserve(dma32_phys_limit);