[PATCH 5.7 107/265] x86/resctrl: Fix memory bandwidth counter width for AMD

Sasha Levin
2020-06-29T22:02:49Z

From: Babu Moger <babu.moger@amd.com>

[ Upstream commit 2c18bd525c47f882f033b0a813ecd09c93e1ecdf ]

Memory bandwidth is calculated reading the monitoring counter
at two intervals and calculating the delta. It is the software’s
responsibility to read the count often enough to avoid having
the count roll over _twice_ between reads.

The current code hardcodes the bandwidth monitoring counter's width
to 24 bits for AMD. This is due to default base counter width which
is 24. Currently, AMD does not implement the CPUID 0xF.[ECX=1]:EAX
to adjust the counter width. But, the AMD hardware supports much
wider bandwidth counter with the default width of 44 bits.

Kernel reads these monitoring counters every 1 second and adjusts the
counter value for overflow. With 24 bits and scale value of 64 for AMD,
it can only measure up to 1GB/s without overflowing. For the rates
above 1GB/s this will fail to measure the bandwidth.

Fix the issue setting the default width to 44 bits by adjusting the
offset.

AMD future products will implement CPUID 0xF.[ECX=1]:EAX.

[ bp: Let the line stick out and drop {}-brackets around a single
statement. ]

Fixes: 4d05bf71f157 ("x86/resctrl: Introduce AMD QOS feature")
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/159129975546.62538.5656031125604254041.stgit@naples-babu.amd.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kernel/cpu/resctrl/core.c | 8 ++++----
arch/x86/kernel/cpu/resctrl/internal.h | 1 +
2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index d242e864726c0..c1551541c7a53 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -980,10 +980,10 @@ void resctrl_cpu_detect(struct cpuinfo_x86 *c)

c->x86_cache_max_rmid = ecx;
c->x86_cache_occ_scale = ebx;
- if (c->x86_vendor == X86_VENDOR_INTEL)
- c->x86_cache_mbm_width_offset = eax & 0xff;
- else
- c->x86_cache_mbm_width_offset = -1;
+ c->x86_cache_mbm_width_offset = eax & 0xff;
+
+ if (c->x86_vendor == X86_VENDOR_AMD && !c->x86_cache_mbm_width_offset)
+ c->x86_cache_mbm_width_offset = MBM_CNTR_WIDTH_OFFSET_AMD;
}
}

diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 3dd13f3a8b231..0963864757143 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -37,6 +37,7 @@
#define MBA_IS_LINEAR 0x4
#define MBA_MAX_MBPS U32_MAX
#define MAX_MBA_BW_AMD 0x800
+#define MBM_CNTR_WIDTH_OFFSET_AMD 20

#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)
--
2.25.1