[PATCH] i386: Enable support for fixed-range IORRs to keep RdMem & WrMem in sync

If our copy of the MTRRs of the BSP has RdMem or WrMem set, and
we are running on an AMD64/K8 system, the boot CPU must have had
MtrrFixDramEn and MtrrFixDramModEn set (otherwise our RDMSR would
have copied these bits cleared), so we set them on this CPU as well.

This allows us to keep the AMD64/K8 RdMem and WrMem bits in sync
across the CPUs of SMP systems in order to fullfill the duty of
system software to "initialize and maintain MTRR consistency
across all processors." as written in the AMD and Intel manuals.

If an WRMSR instruction fails because MtrrFixDramModEn is not
set, I expect that also the Intel-style MTRR bits are not updated.

AK: minor cleanup, moved MSR defines around

Signed-off-by: Bernhard Kaindl <bk@suse.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andi Kleen <ak@suse.de>
Cc: Dave Jones <davej@codemonkey.org.uk>

1 files changed, 60 insertions, 25 deletions

diff --git a/arch/i386/kernel/cpu/mtrr/generic.c b/arch/i386/kernel/cpu/mtrr/generic.c
index 150cf5055a3c..000c07e86433 100644
--- a/arch/i386/kernel/cpu/mtrr/generic.c
+++ b/arch/i386/kernel/cpu/mtrr/generic.c
@@ -20,6 +20,18 @@ struct mtrr_state {
         mtrr_type def_type;
 };
 
+struct fixed_range_block {
+        int base_msr; /* start address of an MTRR block */
+        int ranges;   /* number of MTRRs in this block  */
+};
+
+static struct fixed_range_block fixed_range_blocks[] = {
+        { MTRRfix64K_00000_MSR, 1 }, /* one  64k MTRR  */
+        { MTRRfix16K_80000_MSR, 2 }, /* two  16k MTRRs */
+        { MTRRfix4K_C0000_MSR,  8 }, /* eight 4k MTRRs */
+        {}
+};
+
 static unsigned long smp_changes_mask;
 static struct mtrr_state mtrr_state = {};
 
@@ -152,6 +164,44 @@ void mtrr_wrmsr(unsigned msr, unsigned a, unsigned b)
                         smp_processor_id(), msr, a, b);
 }
 
+/**
+ * Enable and allow read/write of extended fixed-range MTRR bits on K8 CPUs
+ * see AMD publication no. 24593, chapter 3.2.1 for more information
+ */
+static inline void k8_enable_fixed_iorrs(void)
+{
+        unsigned lo, hi;
+
+        rdmsr(MSR_K8_SYSCFG, lo, hi);
+        mtrr_wrmsr(MSR_K8_SYSCFG, lo
+                                | K8_MTRRFIXRANGE_DRAM_ENABLE
+                                | K8_MTRRFIXRANGE_DRAM_MODIFY, hi);
+}
+
+/**
+ * Checks and updates an fixed-range MTRR if it differs from the value it
+ * should have. If K8 extenstions are wanted, update the K8 SYSCFG MSR also.
+ * see AMD publication no. 24593, chapter 7.8.1, page 233 for more information
+ * \param msr MSR address of the MTTR which should be checked and updated
+ * \param changed pointer which indicates whether the MTRR needed to be changed
+ * \param msrwords pointer to the MSR values which the MSR should have
+ */
+static void set_fixed_range(int msr, int * changed, unsigned int * msrwords)
+{
+        unsigned lo, hi;
+
+        rdmsr(msr, lo, hi);
+
+        if (lo != msrwords[0] || hi != msrwords[1]) {
+                if (boot_cpu_data.x86_vendor == X86_VENDOR_AMD &&
+                    boot_cpu_data.x86 == 15 &&
+                    ((msrwords[0] | msrwords[1]) & K8_MTRR_RDMEM_WRMEM_MASK))
+                        k8_enable_fixed_iorrs();
+                mtrr_wrmsr(msr, msrwords[0], msrwords[1]);
+                *changed = TRUE;
+        }
+}
+
 int generic_get_free_region(unsigned long base, unsigned long size, int replace_reg)
 /*  [SUMMARY] Get a free MTRR.
     <base> The starting (base) address of the region.
@@ -201,36 +251,21 @@ static void generic_get_mtrr(unsigned int reg, unsigned long *base,
         *type = base_lo & 0xff;
 }
 
+/**
+ * Checks and updates the fixed-range MTRRs if they differ from the saved set
+ * \param frs pointer to fixed-range MTRR values, saved by get_fixed_ranges()
+ */
 static int set_fixed_ranges(mtrr_type * frs)
 {
-        unsigned int *p = (unsigned int *) frs;
+        unsigned long long *saved = (unsigned long long *) frs;
         int changed = FALSE;
-        int i;
-        unsigned int lo, hi;
+        int block=-1, range;
 
-        rdmsr(MTRRfix64K_00000_MSR, lo, hi);
-        if (p[0] != lo || p[1] != hi) {
-                mtrr_wrmsr(MTRRfix64K_00000_MSR, p[0], p[1]);
-                changed = TRUE;
-        }
-
-        for (i = 0; i < 2; i++) {
-                rdmsr(MTRRfix16K_80000_MSR + i, lo, hi);
-                if (p[2 + i * 2] != lo || p[3 + i * 2] != hi) {
-                        mtrr_wrmsr(MTRRfix16K_80000_MSR + i, p[2 + i * 2],
-                              p[3 + i * 2]);
-                        changed = TRUE;
-                }
-        }
+        while (fixed_range_blocks[++block].ranges)
+            for (range=0; range < fixed_range_blocks[block].ranges; range++)
+                set_fixed_range(fixed_range_blocks[block].base_msr + range,
+                    &changed, (unsigned int *) saved++);
 
-        for (i = 0; i < 8; i++) {
-                rdmsr(MTRRfix4K_C0000_MSR + i, lo, hi);
-                if (p[6 + i * 2] != lo || p[7 + i * 2] != hi) {
-                        mtrr_wrmsr(MTRRfix4K_C0000_MSR + i, p[6 + i * 2],
-                              p[7 + i * 2]);
-                        changed = TRUE;
-                }
-        }
         return changed;
 }