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riscv: mm: Define DIRECT_MAP_PHYSMEM_END

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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>
This commit is contained in:
Vivian Wang 2026-06-06 20:17:54 -06:00 committed by Paul Walmsley
parent dea5db8c57
commit f3336b48cf
1 changed files with 10 additions and 0 deletions
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10
arch/riscv/include/asm/pgtable.h
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@ -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)