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| author | Yazen Ghannam <yazen.ghannam@amd.com> | 2019-02-28 15:36:12 +0000 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2019-03-27 00:13:25 +0100 |
| commit | fc00c6a416381010c4a721a4142ddd0260d68f20 (patch) | |
| tree | 46fcf4c1d8d6b796f65f62ff40ae7375f30c79eb | |
| parent | 0a227af521d6df5286550b62f4b591417170b4ea (diff) | |
| download | linux-fc00c6a416381010c4a721a4142ddd0260d68f20.tar.gz linux-fc00c6a416381010c4a721a4142ddd0260d68f20.tar.bz2 linux-fc00c6a416381010c4a721a4142ddd0260d68f20.zip | |
EDAC/amd64: Adjust printed chip select sizes when interleaved
AMD systems may support chip select interleaving. However, on family
17h+ this was not taken into account when printing the chip select
sizes.
Add support to detect if chip selects are interleaved on family 17h+,
and adjust the sizes accordingly.
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Tested-by: Kim Phillips <kim.phillips@amd.com>
Cc: James Morse <james.morse@arm.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: https://lkml.kernel.org/r/20190228153558.127292-6-Yazen.Ghannam@amd.com
| -rw-r--r-- | drivers/edac/amd64_edac.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c index d89998dcf7f5..4c0239aeff2f 100644 --- a/drivers/edac/amd64_edac.c +++ b/drivers/edac/amd64_edac.c @@ -787,6 +787,22 @@ static void debug_dump_dramcfg_low(struct amd64_pvt *pvt, u32 dclr, int chan) (dclr & BIT(15)) ? "yes" : "no"); } +/* + * The Address Mask should be a contiguous set of bits in the non-interleaved + * case. So to check for CS interleaving, find the most- and least-significant + * bits of the mask, generate a contiguous bitmask, and compare the two. + */ +static bool f17_cs_interleaved(struct amd64_pvt *pvt, u8 ctrl, int cs) +{ + u32 mask = pvt->csels[ctrl].csmasks[cs >> 1]; + u32 msb = fls(mask) - 1, lsb = ffs(mask) - 1; + u32 test_mask = GENMASK(msb, lsb); + + edac_dbg(1, "mask=0x%08x test_mask=0x%08x\n", mask, test_mask); + + return mask ^ test_mask; +} + static void debug_display_dimm_sizes_df(struct amd64_pvt *pvt, u8 ctrl) { int dimm, size0, size1, cs0, cs1; @@ -803,8 +819,19 @@ static void debug_display_dimm_sizes_df(struct amd64_pvt *pvt, u8 ctrl) size1 = 0; cs1 = dimm * 2 + 1; - if (csrow_enabled(cs1, ctrl, pvt)) - size1 = pvt->ops->dbam_to_cs(pvt, ctrl, 0, cs1); + if (csrow_enabled(cs1, ctrl, pvt)) { + /* + * CS interleaving is only supported if both CSes have + * the same amount of memory. Because they are + * interleaved, it will look like both CSes have the + * full amount of memory. Save the size for both as + * half the amount we found on CS0, if interleaved. + */ + if (f17_cs_interleaved(pvt, ctrl, cs1)) + size1 = size0 = (size0 >> 1); + else + size1 = pvt->ops->dbam_to_cs(pvt, ctrl, 0, cs1); + } amd64_info(EDAC_MC ": %d: %5dMB %d: %5dMB\n", cs0, size0, |