6.6-stable review patch. If anyone has any objections, please let me know.
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From: Zhang Rui rui.zhang@intel.com
[ Upstream commit 1d390923974cc233245649cf23833e06b15a9ef7 ]
The hardware definition of every TPMI feature contains a major and minor version. When there is a change in the MMIO offset or change in the definition of a field, hardware will change major version. For addition of new fields without modifying existing MMIO offsets or fields, only the minor version is changed.
If the driver has not been updated to recognize a new hardware major version, it cannot provide the RAPL interface to users due to possible register layout incompatibilities. However, the driver does not need to be updated every time the hardware minor version changes because in that case it will just miss some new functionality exposed by the hardware.
The current implementation causes the driver to refuse to work for any hardware version change which is unnecessarily restrictive.
If there is a minor version mismatch, log an information message and continue, but if there is a major version mismatch, log a warning and exit (as before).
Signed-off-by: Zhang Rui rui.zhang@intel.com Reviewed-by: Srinivas Pandruvada srinivas.pandruvada@linux.intel.com Link: https://patch.msgid.link/20240930081801.28502-4-rui.zhang@intel.com Fixes: 9eef7f9da928 ("powercap: intel_rapl: Introduce RAPL TPMI interface driver") [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/powercap/intel_rapl_tpmi.c | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-)
diff --git a/drivers/powercap/intel_rapl_tpmi.c b/drivers/powercap/intel_rapl_tpmi.c index f6b7f085977ce..0085e59856166 100644 --- a/drivers/powercap/intel_rapl_tpmi.c +++ b/drivers/powercap/intel_rapl_tpmi.c @@ -15,7 +15,8 @@ #include <linux/module.h> #include <linux/slab.h>
-#define TPMI_RAPL_VERSION 1 +#define TPMI_RAPL_MAJOR_VERSION 0 +#define TPMI_RAPL_MINOR_VERSION 1
/* 1 header + 10 registers + 5 reserved. 8 bytes for each. */ #define TPMI_RAPL_DOMAIN_SIZE 128 @@ -154,11 +155,21 @@ static int parse_one_domain(struct tpmi_rapl_package *trp, u32 offset) tpmi_domain_size = tpmi_domain_header >> 16 & 0xff; tpmi_domain_flags = tpmi_domain_header >> 32 & 0xffff;
- if (tpmi_domain_version != TPMI_RAPL_VERSION) { - pr_warn(FW_BUG "Unsupported version:%d\n", tpmi_domain_version); + if (tpmi_domain_version == TPMI_VERSION_INVALID) { + pr_warn(FW_BUG "Invalid version\n"); return -ENODEV; }
+ if (TPMI_MAJOR_VERSION(tpmi_domain_version) != TPMI_RAPL_MAJOR_VERSION) { + pr_warn(FW_BUG "Unsupported major version:%ld\n", + TPMI_MAJOR_VERSION(tpmi_domain_version)); + return -ENODEV; + } + + if (TPMI_MINOR_VERSION(tpmi_domain_version) > TPMI_RAPL_MINOR_VERSION) + pr_info("Ignore: Unsupported minor version:%ld\n", + TPMI_MINOR_VERSION(tpmi_domain_version)); + /* Domain size: in unit of 128 Bytes */ if (tpmi_domain_size != 1) { pr_warn(FW_BUG "Invalid Domain size %d\n", tpmi_domain_size);