x86/mce/AMD: Add system physical address translation for AMD Fam17h

The Unified Memory Controllers (UMCs) on Fam17h log a normalized address
in their MCA_ADDR registers. We need to convert that normalized address
to a system physical address in order to support a few facilities:

1) To offline poisoned pages in DRAM proactively in the deferred error
   handler.

2) To print sysaddr and page info for DRAM ECC errors in EDAC.

[ Boris: fixes/cleanups ontop:

  * hi_addr_offset = 0 - no need for that branch. Stick it all under the
    HiAddrOffsetEn case. It confines hi_addr_offset's declaration too.

  * Move variables to the innermost scope they're used at so that we save
    on stack and not blow it up immediately on function entry.

  * Do not modify *sys_addr prematurely - we want to not exit early and
    have modified *sys_addr some, which callers get to see. We either
    convert to a sys_addr or we don't do anything. And we signal that with
    the retval of the function.

  * Rename label out -> out_err - because it is the error path.

  * No need to pr_err of the conversion failed case: imagine a
    sparsely-populated machine with UMCs which don't have DIMMs. Callers
    should look at the retval instead and issue a printk only when really
    necessary. No need for useless info in dmesg.

  * s/temp_reg/tmp/ and other variable names shortening => shorter code.

  * Use BIT() everywhere.

  * Make error messages more informative.

  *  Small build fix for the !CONFIG_X86_MCE_AMD case.

  * ... and more minor cleanups.
]

Signed-off-by: Yazen Ghannam <Yazen.Ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Aravind Gopalakrishnan <aravindksg.lkml@gmail.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20161122111133.mjzpvzhf7o7yl2oa@pd.tnic
[ Typo fixes. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index bada636..5c81f39 100644 (file)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1025,7 +1025,7 @@ config X86_MCE_INTEL
 config X86_MCE_AMD
        def_bool y
        prompt "AMD MCE features"
-       depends on X86_MCE && X86_LOCAL_APIC
+       depends on X86_MCE && X86_LOCAL_APIC && AMD_NB
        ---help---
           Additional support for AMD specific MCE features such as
           the DRAM Error Threshold.

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index ecda6a9..caab413 100644 (file)
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -252,8 +252,10 @@ static inline void cmci_recheck(void) {}
 
 #ifdef CONFIG_X86_MCE_AMD
 void mce_amd_feature_init(struct cpuinfo_x86 *c);
+int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr);
 #else
 static inline void mce_amd_feature_init(struct cpuinfo_x86 *c) { }
+static inline int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr) { return -EINVAL; };
 #endif
 
 int mce_available(struct cpuinfo_x86 *c);

diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 5b33702..1a0b0a0 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -553,6 +553,206 @@ void mce_amd_feature_init(struct cpuinfo_x86 *c)
                deferred_error_interrupt_enable(c);
 }
 
+int umc_normaddr_to_sysaddr(u64 norm_addr, u16 nid, u8 umc, u64 *sys_addr)
+{
+       u64 dram_base_addr, dram_limit_addr, dram_hole_base;
+       /* We start from the normalized address */
+       u64 ret_addr = norm_addr;
+
+       u32 tmp;
+
+       u8 die_id_shift, die_id_mask, socket_id_shift, socket_id_mask;
+       u8 intlv_num_dies, intlv_num_chan, intlv_num_sockets;
+       u8 intlv_addr_sel, intlv_addr_bit;
+       u8 num_intlv_bits, hashed_bit;
+       u8 lgcy_mmio_hole_en, base = 0;
+       u8 cs_mask, cs_id = 0;
+       bool hash_enabled = false;
+
+       /* Read D18F0x1B4 (DramOffset), check if base 1 is used. */
+       if (amd_df_indirect_read(nid, 0, 0x1B4, umc, &tmp))
+               goto out_err;
+
+       /* Remove HiAddrOffset from normalized address, if enabled: */
+       if (tmp & BIT(0)) {
+               u64 hi_addr_offset = (tmp & GENMASK_ULL(31, 20)) << 8;
+
+               if (norm_addr >= hi_addr_offset) {
+                       ret_addr -= hi_addr_offset;
+                       base = 1;
+               }
+       }
+
+       /* Read D18F0x110 (DramBaseAddress). */
+       if (amd_df_indirect_read(nid, 0, 0x110 + (8 * base), umc, &tmp))
+               goto out_err;
+
+       /* Check if address range is valid. */
+       if (!(tmp & BIT(0))) {
+               pr_err("%s: Invalid DramBaseAddress range: 0x%x.\n",
+                       __func__, tmp);
+               goto out_err;
+       }
+
+       lgcy_mmio_hole_en = tmp & BIT(1);
+       intlv_num_chan    = (tmp >> 4) & 0xF;
+       intlv_addr_sel    = (tmp >> 8) & 0x7;
+       dram_base_addr    = (tmp & GENMASK_ULL(31, 12)) << 16;
+
+       /* {0, 1, 2, 3} map to address bits {8, 9, 10, 11} respectively */
+       if (intlv_addr_sel > 3) {
+               pr_err("%s: Invalid interleave address select %d.\n",
+                       __func__, intlv_addr_sel);
+               goto out_err;
+       }
+
+       /* Read D18F0x114 (DramLimitAddress). */
+       if (amd_df_indirect_read(nid, 0, 0x114 + (8 * base), umc, &tmp))
+               goto out_err;
+
+       intlv_num_sockets = (tmp >> 8) & 0x1;
+       intlv_num_dies    = (tmp >> 10) & 0x3;
+       dram_limit_addr   = ((tmp & GENMASK_ULL(31, 12)) << 16) | GENMASK_ULL(27, 0);
+
+       intlv_addr_bit = intlv_addr_sel + 8;
+
+       /* Re-use intlv_num_chan by setting it equal to log2(#channels) */
+       switch (intlv_num_chan) {
+       case 0: intlv_num_chan = 0; break;
+       case 1: intlv_num_chan = 1; break;
+       case 3: intlv_num_chan = 2; break;
+       case 5: intlv_num_chan = 3; break;
+       case 7: intlv_num_chan = 4; break;
+
+       case 8: intlv_num_chan = 1;
+               hash_enabled = true;
+               break;
+       default:
+               pr_err("%s: Invalid number of interleaved channels %d.\n",
+                       __func__, intlv_num_chan);
+               goto out_err;
+       }
+
+       num_intlv_bits = intlv_num_chan;
+
+       if (intlv_num_dies > 2) {
+               pr_err("%s: Invalid number of interleaved nodes/dies %d.\n",
+                       __func__, intlv_num_dies);
+               goto out_err;
+       }
+
+       num_intlv_bits += intlv_num_dies;
+
+       /* Add a bit if sockets are interleaved. */
+       num_intlv_bits += intlv_num_sockets;
+
+       /* Assert num_intlv_bits <= 4 */
+       if (num_intlv_bits > 4) {
+               pr_err("%s: Invalid interleave bits %d.\n",
+                       __func__, num_intlv_bits);
+               goto out_err;
+       }
+
+       if (num_intlv_bits > 0) {
+               u64 temp_addr_x, temp_addr_i, temp_addr_y;
+               u8 die_id_bit, sock_id_bit, cs_fabric_id;
+
+               /*
+                * Read FabricBlockInstanceInformation3_CS[BlockFabricID].
+                * This is the fabric id for this coherent slave. Use
+                * umc/channel# as instance id of the coherent slave
+                * for FICAA.
+                */
+               if (amd_df_indirect_read(nid, 0, 0x50, umc, &tmp))
+                       goto out_err;
+
+               cs_fabric_id = (tmp >> 8) & 0xFF;
+               die_id_bit   = 0;
+
+               /* If interleaved over more than 1 channel: */
+               if (intlv_num_chan) {
+                       die_id_bit = intlv_num_chan;
+                       cs_mask    = (1 << die_id_bit) - 1;
+                       cs_id      = cs_fabric_id & cs_mask;
+               }
+
+               sock_id_bit = die_id_bit;
+
+               /* Read D18F1x208 (SystemFabricIdMask). */
+               if (intlv_num_dies || intlv_num_sockets)
+                       if (amd_df_indirect_read(nid, 1, 0x208, umc, &tmp))
+                               goto out_err;
+
+               /* If interleaved over more than 1 die. */
+               if (intlv_num_dies) {
+                       sock_id_bit  = die_id_bit + intlv_num_dies;
+                       die_id_shift = (tmp >> 24) & 0xF;
+                       die_id_mask  = (tmp >> 8) & 0xFF;
+
+                       cs_id |= ((cs_fabric_id & die_id_mask) >> die_id_shift) << die_id_bit;
+               }
+
+               /* If interleaved over more than 1 socket. */
+               if (intlv_num_sockets) {
+                       socket_id_shift = (tmp >> 28) & 0xF;
+                       socket_id_mask  = (tmp >> 16) & 0xFF;
+
+                       cs_id |= ((cs_fabric_id & socket_id_mask) >> socket_id_shift) << sock_id_bit;
+               }
+
+               /*
+                * The pre-interleaved address consists of XXXXXXIIIYYYYY
+                * where III is the ID for this CS, and XXXXXXYYYYY are the
+                * address bits from the post-interleaved address.
+                * "num_intlv_bits" has been calculated to tell us how many "I"
+                * bits there are. "intlv_addr_bit" tells us how many "Y" bits
+                * there are (where "I" starts).
+                */
+               temp_addr_y = ret_addr & GENMASK_ULL(intlv_addr_bit-1, 0);
+               temp_addr_i = (cs_id << intlv_addr_bit);
+               temp_addr_x = (ret_addr & GENMASK_ULL(63, intlv_addr_bit)) << num_intlv_bits;
+               ret_addr    = temp_addr_x | temp_addr_i | temp_addr_y;
+       }
+
+       /* Add dram base address */
+       ret_addr += dram_base_addr;
+
+       /* If legacy MMIO hole enabled */
+       if (lgcy_mmio_hole_en) {
+               if (amd_df_indirect_read(nid, 0, 0x104, umc, &tmp))
+                       goto out_err;
+
+               dram_hole_base = tmp & GENMASK(31, 24);
+               if (ret_addr >= dram_hole_base)
+                       ret_addr += (BIT_ULL(32) - dram_hole_base);
+       }
+
+       if (hash_enabled) {
+               /* Save some parentheses and grab ls-bit at the end. */
+               hashed_bit =    (ret_addr >> 12) ^
+                               (ret_addr >> 18) ^
+                               (ret_addr >> 21) ^
+                               (ret_addr >> 30) ^
+                               cs_id;
+
+               hashed_bit &= BIT(0);
+
+               if (hashed_bit != ((ret_addr >> intlv_addr_bit) & BIT(0)))
+                       ret_addr ^= BIT(intlv_addr_bit);
+       }
+
+       /* Is calculated system address is above DRAM limit address? */
+       if (ret_addr > dram_limit_addr)
+               goto out_err;
+
+       *sys_addr = ret_addr;
+       return 0;
+
+out_err:
+       return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(umc_normaddr_to_sysaddr);
+
 static void
 __log_error(unsigned int bank, bool deferred_err, bool threshold_err, u64 misc)
 {