diff options
| author | Vivian Wang <wangruikang@iscas.ac.cn> | 2026-06-07 05:17:54 +0300 |
|---|---|---|
| committer | Paul Walmsley <pjw@kernel.org> | 2026-06-07 08:48:15 +0300 |
| commit | f3336b48cf9d3f2d1fc78e3289c0ded2f00876ee (patch) | |
| tree | cd3e85d8fbd5d896314ebdb37a887363cf6445e6 | |
| parent | dea5db8c5775704f24519d130482d9ceaf66c441 (diff) | |
| download | linux-f3336b48cf9d3f2d1fc78e3289c0ded2f00876ee.tar.xz | |
riscv: mm: Define DIRECT_MAP_PHYSMEM_END
On RISC-V, the actual mappable range of physical address space is
dependent on the current MMU mode i.e. satp_mode (See
Documentation/arch/riscv/vm-layout.rst).
Define the DIRECT_MAP_PHYSMEM_END macro based on the existing virtual
address space layout macros to expose this information to
get_free_mem_region(). Otherwise, it returns a region that couldn't be
mapped, which breaks ZONE_DEVICE.
Cc: stable@vger.kernel.org # v6.13+
Tested-by: Han Gao <gaohan@iscas.ac.cn> # SG2044
Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Link: https://patch.msgid.link/20260309-riscv-sparsemem-vmemmap-limits-v1-2-f40efe18e3cd@iscas.ac.cn
Signed-off-by: Paul Walmsley <pjw@kernel.org>
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index a1a7c6520a09..5d5756bda82e 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -93,6 +93,16 @@ */ #define vmemmap ((struct page *)VMEMMAP_START - vmemmap_start_pfn) +/* Needed to limit get_free_mem_region() */ +#if defined(CONFIG_FLATMEM) +#define DIRECT_MAP_PHYSMEM_END (phys_ram_base + KERN_VIRT_SIZE - 1) +#elif defined(CONFIG_SPARSEMEM_VMEMMAP) +#define DIRECT_MAP_PHYSMEM_END \ + ((vmemmap_start_pfn + VMEMMAP_SIZE / sizeof(struct page)) * PAGE_SIZE - 1) +#elif defined(CONFIG_SPARSEMEM) +/* DIRECT_MAP_PHYSMEM_END is not limited by VA space assignment in this case */ +#endif + #define PCI_IO_SIZE SZ_16M #define PCI_IO_END VMEMMAP_START #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) |