[PATCH 5.10 575/717] EDAC/i10nm: Use readl() to access MMIO registers

Greg Kroah-Hartman
2020-12-28T14:42:52Z

From: Qiuxu Zhuo <qiuxu.zhuo@intel.com>

commit 83ff51c4e3fecf6b8587ce4d46f6eac59f5d7c5a upstream.

Instead of raw access, use readl() to access MMIO registers of
memory controller to avoid possible compiler re-ordering.

Fixes: d4dc89d069aa ("EDAC, i10nm: Add a driver for Intel 10nm server processors")
Cc: <stable@vger.kernel.org>
Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/edac/i10nm_base.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

--- a/drivers/edac/i10nm_base.c
+++ b/drivers/edac/i10nm_base.c
@@ -6,6 +6,7 @@
*/

#include <linux/kernel.h>
+#include <linux/io.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/mce.h>
@@ -19,14 +20,16 @@
#define i10nm_printk(level, fmt, arg...) \
edac_printk(level, "i10nm", fmt, ##arg)

-#define I10NM_GET_SCK_BAR(d, reg) \
+#define I10NM_GET_SCK_BAR(d, reg) \
pci_read_config_dword((d)->uracu, 0xd0, &(reg))
#define I10NM_GET_IMC_BAR(d, i, reg) \
pci_read_config_dword((d)->uracu, 0xd8 + (i) * 4, &(reg))
#define I10NM_GET_DIMMMTR(m, i, j) \
- (*(u32 *)((m)->mbase + 0x2080c + (i) * 0x4000 + (j) * 4))
+ readl((m)->mbase + 0x2080c + (i) * 0x4000 + (j) * 4)
#define I10NM_GET_MCDDRTCFG(m, i, j) \
- (*(u32 *)((m)->mbase + 0x20970 + (i) * 0x4000 + (j) * 4))
+ readl((m)->mbase + 0x20970 + (i) * 0x4000 + (j) * 4)
+#define I10NM_GET_MCMTR(m, i) \
+ readl((m)->mbase + 0x20ef8 + (i) * 0x4000)

#define I10NM_GET_SCK_MMIO_BASE(reg) (GET_BITFIELD(reg, 0, 28) << 23)
#define I10NM_GET_IMC_MMIO_OFFSET(reg) (GET_BITFIELD(reg, 0, 10) << 12)
@@ -148,7 +151,7 @@ static bool i10nm_check_ecc(struct skx_i
{
u32 mcmtr;

- mcmtr = *(u32 *)(imc->mbase + 0x20ef8 + chan * 0x4000);
+ mcmtr = I10NM_GET_MCMTR(imc, chan);
edac_dbg(1, "ch%d mcmtr reg %x\n", chan, mcmtr);

return !!GET_BITFIELD(mcmtr, 2, 2);