powerpc/fsl_booke: Tell map_mem_in_cams() if init is done

In order to be able to call map_mem_in_cams() once more
after init for STRICT_KERNEL_RWX, add an argument.

For now, map_mem_in_cams() is always called only during init.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3b69a7e0b393b16984ade882a5eae5d727717459.1634292136.git.christophe.leroy@csgroup.eu

arch/powerpc/mm/mmu_decl.h

@@ -126,7 +126,7 @@ unsigned long mmu_mapin_ram(unsigned long base, unsigned long top);
 
 #ifdef CONFIG_PPC_FSL_BOOK3E
 extern unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx,
-				     bool dryrun);
+				     bool dryrun, bool init);
 extern unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
 				 phys_addr_t phys);
 #ifdef CONFIG_PPC32

arch/powerpc/mm/nohash/fsl_book3e.c

@@ -167,7 +167,7 @@ unsigned long calc_cam_sz(unsigned long ram, unsigned long virt,
 
 static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
 					unsigned long ram, int max_cam_idx,
-					bool dryrun)
+					bool dryrun, bool init)
 {
 	int i;
 	unsigned long amount_mapped = 0;
@@ -202,12 +202,12 @@ static unsigned long map_mem_in_cams_addr(phys_addr_t phys, unsigned long virt,
 	return amount_mapped;
 }
 
-unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx, bool dryrun)
+unsigned long map_mem_in_cams(unsigned long ram, int max_cam_idx, bool dryrun, bool init)
 {
 	unsigned long virt = PAGE_OFFSET;
 	phys_addr_t phys = memstart_addr;
 
-	return map_mem_in_cams_addr(phys, virt, ram, max_cam_idx, dryrun);
+	return map_mem_in_cams_addr(phys, virt, ram, max_cam_idx, dryrun, init);
 }
 
 #ifdef CONFIG_PPC32
@@ -248,7 +248,7 @@ void __init adjust_total_lowmem(void)
 	ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
 
 	i = switch_to_as1();
-	__max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, false);
+	__max_low_memory = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, false, true);
 	restore_to_as0(i, 0, 0, 1);
 
 	pr_info("Memory CAM mapping: ");
@@ -319,11 +319,11 @@ notrace void __init relocate_init(u64 dt_ptr, phys_addr_t start)
 		/* map a 64M area for the second relocation */
 		if (memstart_addr > start)
 			map_mem_in_cams(0x4000000, CONFIG_LOWMEM_CAM_NUM,
-					false);
+					false, true);
 		else
 			map_mem_in_cams_addr(start, PAGE_OFFSET + offset,
 					0x4000000, CONFIG_LOWMEM_CAM_NUM,
-					false);
+					false, true);
 		restore_to_as0(n, offset, __va(dt_ptr), 1);
 		/* We should never reach here */
 		panic("Relocation error");

arch/powerpc/mm/nohash/kaslr_booke.c

@@ -314,7 +314,7 @@ static unsigned long __init kaslr_choose_location(void *dt_ptr, phys_addr_t size
 		pr_warn("KASLR: No safe seed for randomizing the kernel base.\n");
 
 	ram = min_t(phys_addr_t, __max_low_memory, size);
-	ram = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, true);
+	ram = map_mem_in_cams(ram, CONFIG_LOWMEM_CAM_NUM, true, false);
 	linear_sz = min_t(unsigned long, ram, SZ_512M);
 
 	/* If the linear size is smaller than 64M, do not randmize */

arch/powerpc/mm/nohash/tlb.c

@@ -643,7 +643,7 @@ static void early_init_this_mmu(void)
 
 		if (map)
 			linear_map_top = map_mem_in_cams(linear_map_top,
-							 num_cams, false);
+							 num_cams, true, true);
 	}
 #endif
 
@@ -764,7 +764,7 @@ void setup_initial_memory_limit(phys_addr_t first_memblock_base,
 		num_cams = (mfspr(SPRN_TLB1CFG) & TLBnCFG_N_ENTRY) / 4;
 
 		linear_sz = map_mem_in_cams(first_memblock_size, num_cams,
-					    true);
+					    false, true);
 
 		ppc64_rma_size = min_t(u64, linear_sz, 0x40000000);
 	} else