x86: mtrr cleanup for converting continuous to discrete layout v8 - fix

v9: address format change requests by Ingo
    more case handling in range_to_var_with_hole

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 97a1764..f417fe3 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1110,13 +1110,12 @@ config MTRR_SANITIZER
          If unsure, say Y.
 
 config MTRR_SANITIZER_ENABLE_DEFAULT
-       def_bool y
-       prompt "Enable MTRR cleanup by default"
+       int "MTRR cleanup enable value (0-1)"
+       range 0 1
+       default "0"
        depends on MTRR_SANITIZER
        help
-         Enable mtrr cleanup by default
-
-         If unsure, say Y.
+         Enable mtrr cleanup default value
 
 config X86_PAT
        bool

diff --git a/arch/x86/kernel/cpu/mtrr/main.c b/arch/x86/kernel/cpu/mtrr/main.c
index 5a2a4c1..79597d3 100644 (file)
--- a/arch/x86/kernel/cpu/mtrr/main.c
+++ b/arch/x86/kernel/cpu/mtrr/main.c
@@ -611,17 +611,9 @@ static struct sysdev_driver mtrr_sysdev_driver = {
 };
 
 #ifdef CONFIG_MTRR_SANITIZER
-
-#ifdef CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT
-static int enable_mtrr_cleanup __initdata = 1;
-#else
-static int enable_mtrr_cleanup __initdata;
-#endif
-
+static int enable_mtrr_cleanup __initdata = CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT;
 #else
-
 static int enable_mtrr_cleanup __initdata = -1;
-
 #endif
 
 static int __init disable_mtrr_cleanup_setup(char *str)
@@ -640,6 +632,7 @@ static int __init enable_mtrr_cleanup_setup(char *str)
 }
 early_param("enble_mtrr_cleanup", enable_mtrr_cleanup_setup);
 
+/* should be related to MTRR_VAR_RANGES nums */
 #define RANGE_NUM 256
 
 struct res_range {
@@ -647,13 +640,27 @@ struct res_range {
        unsigned long end;
 };
 
-static int __init add_range(struct res_range *range, int nr_range, unsigned long start,
-                             unsigned long end, int merge)
+static int __init
+add_range(struct res_range *range, int nr_range, unsigned long start,
+                             unsigned long end)
 {
-       int i;
+       /* out of slots */
+       if (nr_range >= RANGE_NUM)
+               return nr_range;
 
-       if (!merge)
-               goto addit;
+       range[nr_range].start = start;
+       range[nr_range].end = end;
+
+       nr_range++;
+
+       return nr_range;
+}
+
+static int __init
+add_range_with_merge(struct res_range *range, int nr_range, unsigned long start,
+                             unsigned long end)
+{
+       int i;
 
        /* try to merge it with old one */
        for (i = 0; i < nr_range; i++) {
@@ -676,24 +683,14 @@ static int __init add_range(struct res_range *range, int nr_range, unsigned long
                return nr_range;
        }
 
-addit:
        /* need to add that */
-       if (nr_range >= RANGE_NUM)
-               return nr_range;
-
-       range[nr_range].start = start;
-       range[nr_range].end = end;
-
-       nr_range++;
-
-       return nr_range;
-
+       return add_range(range, nr_range, start, end);
 }
-static void __init subtract_range(struct res_range *range, unsigned long start,
-                               unsigned long end)
+
+static void __init
+subtract_range(struct res_range *range, unsigned long start, unsigned long end)
 {
-       int i;
-       int j;
+       int i, j;
 
        for (j = 0; j < RANGE_NUM; j++) {
                if (!range[j].end)
@@ -747,46 +744,47 @@ static int __init cmp_range(const void *x1, const void *x2)
 }
 
 struct var_mtrr_state {
-       unsigned long range_startk, range_sizek;
-       unsigned long chunk_sizek;
-       unsigned long gran_sizek;
-       unsigned int reg;
-       unsigned address_bits;
+       unsigned long   range_startk;
+       unsigned long   range_sizek;
+       unsigned long   chunk_sizek;
+       unsigned long   gran_sizek;
+       unsigned int    reg;
+       unsigned int    address_bits;
 };
 
-static void __init set_var_mtrr(
-       unsigned int reg, unsigned long basek, unsigned long sizek,
-       unsigned char type, unsigned address_bits)
+static void __init
+set_var_mtrr(unsigned int reg, unsigned long basek, unsigned long sizek,
+               unsigned char type, unsigned address_bits)
 {
        u32 base_lo, base_hi, mask_lo, mask_hi;
-       unsigned address_mask_high;
+       u64 base, mask;
 
        if (!sizek) {
                fill_mtrr_var_range(reg, 0, 0, 0, 0);
                return;
        }
 
-       address_mask_high = ((1u << (address_bits - 32u)) - 1u);
+       mask = (1ULL << address_bits) - 1;
+       mask &= ~((((u64)sizek) << 10) - 1);
 
-       base_hi = basek >> 22;
-       base_lo  = basek << 10;
+       base  = ((u64)basek) << 10;
 
-       if (sizek < 4*1024*1024) {
-               mask_hi = address_mask_high;
-               mask_lo = ~((sizek << 10) - 1);
-       } else {
-               mask_hi = address_mask_high & (~((sizek >> 22) - 1));
-               mask_lo = 0;
-       }
+       base |= type;
+       mask |= 0x800;
+
+       base_lo = base & ((1ULL<<32) - 1);
+       base_hi = base >> 32;
+
+       mask_lo = mask & ((1ULL<<32) - 1);
+       mask_hi = mask >> 32;
 
-       base_lo |= type;
-       mask_lo |= 0x800;
        fill_mtrr_var_range(reg, base_lo, base_hi, mask_lo, mask_hi);
 }
 
-static unsigned int __init range_to_mtrr(unsigned int reg,
-       unsigned long range_startk, unsigned long range_sizek,
-       unsigned char type, unsigned address_bits)
+static unsigned int __init
+range_to_mtrr(unsigned int reg, unsigned long range_startk,
+             unsigned long range_sizek, unsigned char type,
+             unsigned address_bits)
 {
        if (!range_sizek || (reg >= num_var_ranges))
                return reg;
@@ -794,6 +792,7 @@ static unsigned int __init range_to_mtrr(unsigned int reg,
        while (range_sizek) {
                unsigned long max_align, align;
                unsigned long sizek;
+
                /* Compute the maximum size I can make a range */
                if (range_startk)
                        max_align = ffs(range_startk) - 1;
@@ -818,7 +817,8 @@ static unsigned int __init range_to_mtrr(unsigned int reg,
        return reg;
 }
 
-static void __init range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek)
+static void __init
+range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigned long basek)
 {
        unsigned long hole_basek, hole_sizek;
        unsigned long range0_basek, range0_sizek;
@@ -848,23 +848,31 @@ static void __init range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigne
        /* try to append some small hole */
        range0_basek = state->range_startk;
        range0_sizek = ALIGN(state->range_sizek, chunk_sizek);
-       if ((range0_sizek == state->range_sizek) ||
-           ((range0_basek + range0_sizek - chunk_sizek > basek) && basek)) {
+       if (range0_sizek == state->range_sizek) {
                        printk(KERN_INFO "rangeX: %016lx - %016lx\n", range0_basek<<10, (range0_basek + state->range_sizek)<<10);
                        state->reg = range_to_mtrr(state->reg, range0_basek,
                                state->range_sizek, MTRR_TYPE_WRBACK, state->address_bits);
                return;
+       } else if (basek) {
+           while (range0_basek + range0_sizek - chunk_sizek > basek) {
+               range0_sizek -= chunk_sizek;
+               if (!range0_sizek)
+                       break;
+           }
        }
 
 
-       range0_sizek -= chunk_sizek;
+       if (range0_sizek > chunk_sizek)
+               range0_sizek -= chunk_sizek;
        printk(KERN_INFO "range0: %016lx - %016lx\n", range0_basek<<10, (range0_basek + range0_sizek)<<10);
        state->reg = range_to_mtrr(state->reg, range0_basek,
                        range0_sizek, MTRR_TYPE_WRBACK, state->address_bits);
 
        range_basek = range0_basek + range0_sizek;
        range_sizek = chunk_sizek;
-       if (range_sizek - (state->range_sizek - range0_sizek) < (chunk_sizek >> 1)) {
+
+       if ((range_sizek - (state->range_sizek - range0_sizek) < (chunk_sizek >> 1)) &&
+           (range_basek + range_sizek <= basek)) {
                hole_sizek = range_sizek - (state->range_sizek - range0_sizek);
                hole_basek = range_basek + range_sizek - hole_sizek;
        } else
@@ -880,7 +888,9 @@ static void __init range_to_mtrr_with_hole(struct var_mtrr_state *state, unsigne
        }
 }
 
-static void __init set_var_mtrr_range(struct var_mtrr_state *state, unsigned long base_pfn, unsigned long size_pfn)
+static void __init
+set_var_mtrr_range(struct var_mtrr_state *state, unsigned long base_pfn,
+                  unsigned long size_pfn)
 {
        unsigned long basek, sizek;
 
@@ -921,7 +931,7 @@ static int __init parse_mtrr_chunk_size_opt(char *p)
 early_param("mtrr_chunk_size", parse_mtrr_chunk_size_opt);
 
 /* granity of mtrr of block */
-static u64 mtrr_gran_size __initdata = (64ULL<<20);
+static u64 mtrr_gran_size __initdata = (1ULL<<20);
 
 static int __init parse_mtrr_gran_size_opt(char *p)
 {
@@ -932,17 +942,19 @@ static int __init parse_mtrr_gran_size_opt(char *p)
 }
 early_param("mtrr_gran_size", parse_mtrr_gran_size_opt);
 
-static void __init x86_setup_var_mtrrs(struct res_range *range, int nr_range, unsigned address_bits)
+static void __init
+x86_setup_var_mtrrs(struct res_range *range, int nr_range,
+                   unsigned address_bits)
 {
        struct var_mtrr_state var_state;
        int i;
 
-       var_state.range_startk = 0;
-       var_state.range_sizek = 0;
-       var_state.reg = 0;
-       var_state.address_bits = address_bits;
-       var_state.chunk_sizek = mtrr_chunk_size >> 10;
-       var_state.gran_sizek = mtrr_gran_size >> 10;
+       var_state.range_startk  = 0;
+       var_state.range_sizek   = 0;
+       var_state.reg           = 0;
+       var_state.address_bits  = address_bits;
+       var_state.chunk_sizek   = mtrr_chunk_size >> 10;
+       var_state.gran_sizek    = mtrr_gran_size >> 10;
 
        /* Write the range etc */
        for (i = 0; i < nr_range; i++)
@@ -952,11 +964,16 @@ static void __init x86_setup_var_mtrrs(struct res_range *range, int nr_range, un
        range_to_mtrr_with_hole(&var_state, 0);
        printk(KERN_INFO "DONE variable MTRRs\n");
        /* Clear out the extra MTRR's */
-       while (var_state.reg < num_var_ranges)
-               set_var_mtrr(var_state.reg++, 0, 0, 0, var_state.address_bits);
+       while (var_state.reg < num_var_ranges) {
+               set_var_mtrr(var_state.reg, 0, 0, 0, var_state.address_bits);
+               var_state.reg++;
+       }
 }
 
-static int __init x86_get_mtrr_mem_range(struct res_range *range, int nr_range, unsigned long extra_remove_base, unsigned long extra_remove_size)
+static int __init
+x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
+                      unsigned long extra_remove_base,
+                      unsigned long extra_remove_size)
 {
        unsigned long i, base, size;
        mtrr_type type;
@@ -965,7 +982,7 @@ static int __init x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
                mtrr_if->get(i, &base, &size, &type);
                if (type != MTRR_TYPE_WRBACK)
                        continue;
-               nr_range = add_range(range, nr_range, base, base + size - 1, 1);
+               nr_range = add_range_with_merge(range, nr_range, base, base + size - 1);
        }
        printk(KERN_INFO "After WB checking\n");
        for (i = 0; i < nr_range; i++)
@@ -1005,11 +1022,11 @@ static int __init x86_get_mtrr_mem_range(struct res_range *range, int nr_range,
 
 static int __init mtrr_cleanup(unsigned address_bits)
 {
+       unsigned long extra_remove_base, extra_remove_size;
        unsigned long i, base, size, def, dummy;
-       mtrr_type type;
        struct res_range range[RANGE_NUM];
+       mtrr_type type;
        int nr_range;
-       unsigned long extra_remove_base, extra_remove_size;
 
        /* extra one for all 0 */
        int num[MTRR_NUM_TYPES + 1];
@@ -1053,7 +1070,6 @@ static int __init mtrr_cleanup(unsigned address_bits)
        x86_setup_var_mtrrs(range, nr_range, address_bits);
 
        return 1;
-
 }
 
 static int disable_mtrr_trim;