Merge tag 'riscv-for-linus-6.15-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Palmer Dabbelt:

 - The sub-architecture selection Kconfig system has been cleaned up,
   the documentation has been improved, and various detections have been
   fixed

 - The vector-related extensions dependencies are now validated when
   parsing from device tree and in the DT bindings

 - Misaligned access probing can be overridden via a kernel command-line
   parameter, along with various fixes to misalign access handling

 - Support for relocatable !MMU kernels builds

 - Support for hpge pfnmaps, which should improve TLB utilization

 - Support for runtime constants, which improves the d_hash()
   performance

 - Support for bfloat16, Zicbom, Zaamo, Zalrsc, Zicntr, Zihpm

 - Various fixes, including:
      - We were missing a secondary mmu notifier call when flushing the
        tlb which is required for IOMMU
      - Fix ftrace panics by saving the registers as expected by ftrace
      - Fix a couple of stimecmp usage related to cpu hotplug
      - purgatory_start is now aligned as per the STVEC requirements
      - A fix for hugetlb when calculating the size of non-present PTEs

* tag 'riscv-for-linus-6.15-mw1' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (65 commits)
  riscv: Add norvc after .option arch in runtime const
  riscv: Make sure toolchain supports zba before using zba instructions
  riscv/purgatory: 4B align purgatory_start
  riscv/kexec_file: Handle R_RISCV_64 in purgatory relocator
  selftests: riscv: fix v_exec_initval_nolibc.c
  riscv: Fix hugetlb retrieval of number of ptes in case of !present pte
  riscv: print hartid on bringup
  riscv: Add norvc after .option arch in runtime const
  riscv: Remove CONFIG_PAGE_OFFSET
  riscv: Support CONFIG_RELOCATABLE on riscv32
  asm-generic: Always define Elf_Rel and Elf_Rela
  riscv: Support CONFIG_RELOCATABLE on NOMMU
  riscv: Allow NOMMU kernels to access all of RAM
  riscv: Remove duplicate CONFIG_PAGE_OFFSET definition
  RISC-V: errata: Use medany for relocatable builds
  dt-bindings: riscv: document vector crypto requirements
  dt-bindings: riscv: add vector sub-extension dependencies
  dt-bindings: riscv: d requires f
  RISC-V: add f & d extension validation checks
  RISC-V: add vector crypto extension validation checks
  ...

1 files changed, 49 insertions, 48 deletions

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 66ee5ee42aa8..ab475ec6ca42 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -20,15 +20,13 @@
 #include <linux/dma-map-ops.h>
 #include <linux/crash_dump.h>
 #include <linux/hugetlb.h>
-#ifdef CONFIG_RELOCATABLE
-#include <linux/elf.h>
-#endif
 #include <linux/kfence.h>
 #include <linux/execmem.h>
 
 #include <asm/fixmap.h>
 #include <asm/io.h>
 #include <asm/kasan.h>
+#include <asm/module.h>
 #include <asm/numa.h>
 #include <asm/pgtable.h>
 #include <asm/sections.h>
@@ -320,6 +318,44 @@ static void __init setup_bootmem(void)
 		hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
 }
 
+#ifdef CONFIG_RELOCATABLE
+extern unsigned long __rela_dyn_start, __rela_dyn_end;
+
+static void __init relocate_kernel(void)
+{
+	Elf_Rela *rela = (Elf_Rela *)&__rela_dyn_start;
+	/*
+	 * This holds the offset between the linked virtual address and the
+	 * relocated virtual address.
+	 */
+	uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR;
+	/*
+	 * This holds the offset between kernel linked virtual address and
+	 * physical address.
+	 */
+	uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr;
+
+	for ( ; rela < (Elf_Rela *)&__rela_dyn_end; rela++) {
+		Elf_Addr addr = (rela->r_offset - va_kernel_link_pa_offset);
+		Elf_Addr relocated_addr = rela->r_addend;
+
+		if (rela->r_info != R_RISCV_RELATIVE)
+			continue;
+
+		/*
+		 * Make sure to not relocate vdso symbols like rt_sigreturn
+		 * which are linked from the address 0 in vmlinux since
+		 * vdso symbol addresses are actually used as an offset from
+		 * mm->context.vdso in VDSO_OFFSET macro.
+		 */
+		if (relocated_addr >= KERNEL_LINK_ADDR)
+			relocated_addr += reloc_offset;
+
+		*(Elf_Addr *)addr = relocated_addr;
+	}
+}
+#endif /* CONFIG_RELOCATABLE */
+
 #ifdef CONFIG_MMU
 struct pt_alloc_ops pt_ops __meminitdata;
 
@@ -820,6 +856,8 @@ static __init void set_satp_mode(uintptr_t dtb_pa)
 	uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
 	u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa);
 
+	kernel_map.page_offset = PAGE_OFFSET_L5;
+
 	if (satp_mode_cmdline == SATP_MODE_57) {
 		disable_pgtable_l5();
 	} else if (satp_mode_cmdline == SATP_MODE_48) {
@@ -890,44 +928,6 @@ retry:
 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
 #endif
 
-#ifdef CONFIG_RELOCATABLE
-extern unsigned long __rela_dyn_start, __rela_dyn_end;
-
-static void __init relocate_kernel(void)
-{
-	Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start;
-	/*
-	 * This holds the offset between the linked virtual address and the
-	 * relocated virtual address.
-	 */
-	uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR;
-	/*
-	 * This holds the offset between kernel linked virtual address and
-	 * physical address.
-	 */
-	uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr;
-
-	for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) {
-		Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset);
-		Elf64_Addr relocated_addr = rela->r_addend;
-
-		if (rela->r_info != R_RISCV_RELATIVE)
-			continue;
-
-		/*
-		 * Make sure to not relocate vdso symbols like rt_sigreturn
-		 * which are linked from the address 0 in vmlinux since
-		 * vdso symbol addresses are actually used as an offset from
-		 * mm->context.vdso in VDSO_OFFSET macro.
-		 */
-		if (relocated_addr >= KERNEL_LINK_ADDR)
-			relocated_addr += reloc_offset;
-
-		*(Elf64_Addr *)addr = relocated_addr;
-	}
-}
-#endif /* CONFIG_RELOCATABLE */
-
 #ifdef CONFIG_XIP_KERNEL
 static void __init create_kernel_page_table(pgd_t *pgdir,
 					    __always_unused bool early)
@@ -1105,11 +1105,6 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 	kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset;
 
 #ifdef CONFIG_XIP_KERNEL
-#ifdef CONFIG_64BIT
-	kernel_map.page_offset = PAGE_OFFSET_L3;
-#else
-	kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
-#endif
 	kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
 	kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
 
@@ -1124,7 +1119,6 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 	kernel_map.va_kernel_xip_data_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr
 						+ (uintptr_t)&_sdata - (uintptr_t)&_start;
 #else
-	kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
 	kernel_map.phys_addr = (uintptr_t)(&_start);
 	kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
 	kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
@@ -1171,7 +1165,8 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 	 * makes the kernel cross over a PUD_SIZE boundary, raise a bug
 	 * since a part of the kernel would not get mapped.
 	 */
-	BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size);
+	if (IS_ENABLED(CONFIG_64BIT))
+		BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size);
 	relocate_kernel();
 #endif
 
@@ -1375,6 +1370,12 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa)
 {
 	dtb_early_va = (void *)dtb_pa;
 	dtb_early_pa = dtb_pa;
+
+#ifdef CONFIG_RELOCATABLE
+	kernel_map.virt_addr = (uintptr_t)_start;
+	kernel_map.phys_addr = (uintptr_t)_start;
+	relocate_kernel();
+#endif
 }
 
 static inline void setup_vm_final(void)