xtensa: move fixmap and kmap just above the KSEG

The virtual address space between the page table and the VMALLOC region
is big enough to host KASAN shadow map and there's enough space between
the VMALLOC area and KSEG for the fixmap and kmap.
Move fixmap and kmap to the gap between VMALLOC area and KSEG, just
above the KSEG. Reorder entries in the kernel memory layout printing
code. Drop duplicate PGTABLE_START definition, use
XCHAL_PAGE_TABLE_VADDR instead.

Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/Documentation/xtensa/mmu.txt b/Documentation/xtensa/mmu.txt
index 5de8715d5bec7cd41629979a868283b86f343bcc..16921393e366c8f12087da69c41d8a28a9534ce7 100644 (file)
--- a/Documentation/xtensa/mmu.txt
+++ b/Documentation/xtensa/mmu.txt
@@ -69,19 +69,8 @@ Default MMUv2-compatible layout.
 | Userspace        |                           0x00000000  TASK_SIZE
 +------------------+                           0x40000000
 +------------------+
-| Page table       |                           0x80000000
-+------------------+                           0x80400000
+| Page table       |  XCHAL_PAGE_TABLE_VADDR   0x80000000  XCHAL_PAGE_TABLE_SIZE
 +------------------+
-| KMAP area        |  PKMAP_BASE                           PTRS_PER_PTE *
-|                  |                                       DCACHE_N_COLORS *
-|                  |                                       PAGE_SIZE
-|                  |                                       (4MB * DCACHE_N_COLORS)
-+------------------+
-| Atomic KMAP area |  FIXADDR_START                        KM_TYPE_NR *
-|                  |                                       NR_CPUS *
-|                  |                                       DCACHE_N_COLORS *
-|                  |                                       PAGE_SIZE
-+------------------+  FIXADDR_TOP              0xbffff000
 +------------------+
 | VMALLOC area     |  VMALLOC_START            0xc0000000  128MB - 64KB
 +------------------+  VMALLOC_END
@@ -92,6 +81,17 @@ Default MMUv2-compatible layout.
 | remap area 2     |
 +------------------+
 +------------------+
+| KMAP area        |  PKMAP_BASE                           PTRS_PER_PTE *
+|                  |                                       DCACHE_N_COLORS *
+|                  |                                       PAGE_SIZE
+|                  |                                       (4MB * DCACHE_N_COLORS)
++------------------+
+| Atomic KMAP area |  FIXADDR_START                        KM_TYPE_NR *
+|                  |                                       NR_CPUS *
+|                  |                                       DCACHE_N_COLORS *
+|                  |                                       PAGE_SIZE
++------------------+  FIXADDR_TOP              0xcffff000
++------------------+
 | Cached KSEG      |  XCHAL_KSEG_CACHED_VADDR  0xd0000000  128MB
 +------------------+
 | Uncached KSEG    |  XCHAL_KSEG_BYPASS_VADDR  0xd8000000  128MB
@@ -109,19 +109,8 @@ Default MMUv2-compatible layout.
 | Userspace        |                           0x00000000  TASK_SIZE
 +------------------+                           0x40000000
 +------------------+
-| Page table       |                           0x80000000
-+------------------+                           0x80400000
+| Page table       |  XCHAL_PAGE_TABLE_VADDR   0x80000000  XCHAL_PAGE_TABLE_SIZE
 +------------------+
-| KMAP area        |  PKMAP_BASE                           PTRS_PER_PTE *
-|                  |                                       DCACHE_N_COLORS *
-|                  |                                       PAGE_SIZE
-|                  |                                       (4MB * DCACHE_N_COLORS)
-+------------------+
-| Atomic KMAP area |  FIXADDR_START                        KM_TYPE_NR *
-|                  |                                       NR_CPUS *
-|                  |                                       DCACHE_N_COLORS *
-|                  |                                       PAGE_SIZE
-+------------------+  FIXADDR_TOP              0x9ffff000
 +------------------+
 | VMALLOC area     |  VMALLOC_START            0xa0000000  128MB - 64KB
 +------------------+  VMALLOC_END
@@ -132,6 +121,17 @@ Default MMUv2-compatible layout.
 | remap area 2     |
 +------------------+
 +------------------+
+| KMAP area        |  PKMAP_BASE                           PTRS_PER_PTE *
+|                  |                                       DCACHE_N_COLORS *
+|                  |                                       PAGE_SIZE
+|                  |                                       (4MB * DCACHE_N_COLORS)
++------------------+
+| Atomic KMAP area |  FIXADDR_START                        KM_TYPE_NR *
+|                  |                                       NR_CPUS *
+|                  |                                       DCACHE_N_COLORS *
+|                  |                                       PAGE_SIZE
++------------------+  FIXADDR_TOP              0xaffff000
++------------------+
 | Cached KSEG      |  XCHAL_KSEG_CACHED_VADDR  0xb0000000  256MB
 +------------------+
 | Uncached KSEG    |  XCHAL_KSEG_BYPASS_VADDR  0xc0000000  256MB
@@ -150,19 +150,8 @@ Default MMUv2-compatible layout.
 | Userspace        |                           0x00000000  TASK_SIZE
 +------------------+                           0x40000000
 +------------------+
-| Page table       |                           0x80000000
-+------------------+                           0x80400000
+| Page table       |  XCHAL_PAGE_TABLE_VADDR   0x80000000  XCHAL_PAGE_TABLE_SIZE
 +------------------+
-| KMAP area        |  PKMAP_BASE                           PTRS_PER_PTE *
-|                  |                                       DCACHE_N_COLORS *
-|                  |                                       PAGE_SIZE
-|                  |                                       (4MB * DCACHE_N_COLORS)
-+------------------+
-| Atomic KMAP area |  FIXADDR_START                        KM_TYPE_NR *
-|                  |                                       NR_CPUS *
-|                  |                                       DCACHE_N_COLORS *
-|                  |                                       PAGE_SIZE
-+------------------+  FIXADDR_TOP              0x8ffff000
 +------------------+
 | VMALLOC area     |  VMALLOC_START            0x90000000  128MB - 64KB
 +------------------+  VMALLOC_END
@@ -173,6 +162,17 @@ Default MMUv2-compatible layout.
 | remap area 2     |
 +------------------+
 +------------------+
+| KMAP area        |  PKMAP_BASE                           PTRS_PER_PTE *
+|                  |                                       DCACHE_N_COLORS *
+|                  |                                       PAGE_SIZE
+|                  |                                       (4MB * DCACHE_N_COLORS)
++------------------+
+| Atomic KMAP area |  FIXADDR_START                        KM_TYPE_NR *
+|                  |                                       NR_CPUS *
+|                  |                                       DCACHE_N_COLORS *
+|                  |                                       PAGE_SIZE
++------------------+  FIXADDR_TOP              0x9ffff000
++------------------+
 | Cached KSEG      |  XCHAL_KSEG_CACHED_VADDR  0xa0000000  512MB
 +------------------+
 | Uncached KSEG    |  XCHAL_KSEG_BYPASS_VADDR  0xc0000000  512MB

diff --git a/arch/xtensa/include/asm/fixmap.h b/arch/xtensa/include/asm/fixmap.h
index 0d30403b6c95977c6467cd130ac78889c406e240..7e25c1b50ac012962cfe38bc2849aeee467d2a89 100644 (file)
--- a/arch/xtensa/include/asm/fixmap.h
+++ b/arch/xtensa/include/asm/fixmap.h
@@ -44,7 +44,7 @@ enum fixed_addresses {
        __end_of_fixed_addresses
 };
 
-#define FIXADDR_TOP     (VMALLOC_START - PAGE_SIZE)
+#define FIXADDR_TOP     (XCHAL_KSEG_CACHED_VADDR - PAGE_SIZE)
 #define FIXADDR_SIZE   (__end_of_fixed_addresses << PAGE_SHIFT)
 #define FIXADDR_START  ((FIXADDR_TOP - FIXADDR_SIZE) & PMD_MASK)
 
@@ -63,7 +63,7 @@ static __always_inline unsigned long fix_to_virt(const unsigned int idx)
         * table.
         */
        BUILD_BUG_ON(FIXADDR_START <
-                    XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE);
+                    TLBTEMP_BASE_1 + TLBTEMP_SIZE);
        BUILD_BUG_ON(idx >= __end_of_fixed_addresses);
        return __fix_to_virt(idx);
 }

diff --git a/arch/xtensa/include/asm/highmem.h b/arch/xtensa/include/asm/highmem.h
index 6e070db1022e69e55a229117839463057edc8a30..04e9340eac4b50e0d3fc903652eb086cd5f7d59a 100644 (file)
--- a/arch/xtensa/include/asm/highmem.h
+++ b/arch/xtensa/include/asm/highmem.h
@@ -72,7 +72,7 @@ static inline void *kmap(struct page *page)
         * page table.
         */
        BUILD_BUG_ON(PKMAP_BASE <
-                    XCHAL_PAGE_TABLE_VADDR + XCHAL_PAGE_TABLE_SIZE);
+                    TLBTEMP_BASE_1 + TLBTEMP_SIZE);
        BUG_ON(in_interrupt());
        if (!PageHighMem(page))
                return page_address(page);

diff --git a/arch/xtensa/include/asm/page.h b/arch/xtensa/include/asm/page.h
index 4ddbfd57a7c824c7d05aaa3d6d8824a849d03628..5d69c11c01b8f991d0e2fc8f92a1b38d6091d835 100644 (file)
--- a/arch/xtensa/include/asm/page.h
+++ b/arch/xtensa/include/asm/page.h
@@ -36,8 +36,6 @@
 #define MAX_LOW_PFN    PHYS_PFN(0xfffffffful)
 #endif
 
-#define PGTABLE_START  0x80000000
-
 /*
  * Cache aliasing:
  *

diff --git a/arch/xtensa/mm/init.c b/arch/xtensa/mm/init.c
index 720fe4e8b49712db84e4e00d5fb938c9ecb4220e..6fc1cb093fb36852ee7d49c71431d7b5b4aa75a9 100644 (file)
--- a/arch/xtensa/mm/init.c
+++ b/arch/xtensa/mm/init.c
@@ -100,23 +100,23 @@ void __init mem_init(void)
 
        mem_init_print_info(NULL);
        pr_info("virtual kernel memory layout:\n"
+#ifdef CONFIG_MMU
+               "    vmalloc : 0x%08lx - 0x%08lx  (%5lu MB)\n"
+#endif
 #ifdef CONFIG_HIGHMEM
                "    pkmap   : 0x%08lx - 0x%08lx  (%5lu kB)\n"
                "    fixmap  : 0x%08lx - 0x%08lx  (%5lu kB)\n"
-#endif
-#ifdef CONFIG_MMU
-               "    vmalloc : 0x%08lx - 0x%08lx  (%5lu MB)\n"
 #endif
                "    lowmem  : 0x%08lx - 0x%08lx  (%5lu MB)\n",
+#ifdef CONFIG_MMU
+               VMALLOC_START, VMALLOC_END,
+               (VMALLOC_END - VMALLOC_START) >> 20,
 #ifdef CONFIG_HIGHMEM
                PKMAP_BASE, PKMAP_BASE + LAST_PKMAP * PAGE_SIZE,
                (LAST_PKMAP*PAGE_SIZE) >> 10,
                FIXADDR_START, FIXADDR_TOP,
                (FIXADDR_TOP - FIXADDR_START) >> 10,
 #endif
-#ifdef CONFIG_MMU
-               VMALLOC_START, VMALLOC_END,
-               (VMALLOC_END - VMALLOC_START) >> 20,
                PAGE_OFFSET, PAGE_OFFSET +
                (max_low_pfn - min_low_pfn) * PAGE_SIZE,
 #else