Alison Schofield 3e88562092 cxl: Restore XOR'd position bits during address translation ... [ Upstream commit 3b2fedcd75 ] When a device reports a DPA in events like poison, general_media, and dram, the driver translates that DPA back to an HPA. Presently, the CXL driver translation only considers the Modulo position and will report the wrong HPA for XOR configured root decoders. Add a helper function that restores the XOR'd bits during DPA->HPA address translation. Plumb a root decoder callback to the new helper when XOR interleave arithmetic is in use. For Modulo arithmetic, just let the callback be NULL - as in no extra work required. Upon completion of a DPA->HPA translation a couple of checks are performed on the result. One simply confirms that the calculated HPA is within the address range of the region. That test is useful for both Modulo and XOR interleave arithmetic decodes. A second check confirms that the HPA is within an expected chunk based on the endpoints position in the region and the region granularity. An XOR decode disrupts the Modulo pattern making the chunk check useless. To align the checks with the proper decode, pull the region range check inline and use the helper to do the chunk check for Modulo decodes only. A cxl-test unit test is posted for upstream review here: https://lore.kernel.org/20240624210644.495563-1-alison.schofield@intel.com/ Fixes: 28a3ae4ff6 ("cxl/trace: Add an HPA to cxl_poison trace events") Signed-off-by: Alison Schofield <alison.schofield@intel.com> Tested-by: Diego Garcia Rodriguez <diego.garcia.rodriguez@intel.com> Reviewed-by: Dan Williams <dan.j.williams@intel.com> Link: https://patch.msgid.link/1a1ac880d9f889bd6384e657e810431b9a0a72e5.1719980933.git.alison.schofield@intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-09-18 19:25:14 +02:00
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cdat.c	cxl: Consolidate dport access_coordinate ->hb_coord and ->sw_coord into ->coord	2024-04-08 08:25:21 -07:00
core.h	cxl/region: Move cxl_trace_hpa() work to the region driver	2024-04-30 12:24:42 -07:00
hdm.c	cxl/region: check interleave capability	2024-06-25 14:45:27 -07:00
Makefile	cxl: Add callback to parse the DSMAS subtables from CDAT	2023-12-22 14:33:10 -08:00
mbox.c	Merge remote-tracking branch 'cxl/for-6.10/dpa-to-hpa' into cxl-for-next	2024-04-30 13:45:43 -07:00
memdev.c	cxl/region: Move cxl_dpa_to_region() work to the region driver	2024-04-30 12:24:42 -07:00
pci.c	cxl: Add post-reset warning if reset results in loss of previously committed HDM decoders	2024-05-08 13:25:46 -05:00
pmem.c	cxl/mem: Fix no cxl_nvd during pmem region auto-assembling	2024-06-18 16:56:50 -07:00
pmu.c	cxl/pmu: Ensure put_device on pmu devices	2023-12-14 21:54:45 -08:00
port.c	cxl: Fix cxl_endpoint_get_perf_coordinate() support for RCH	2024-04-29 09:03:26 -07:00
region.c	cxl: Restore XOR'd position bits during address translation	2024-09-18 19:25:14 +02:00
regs.c	pci-v6.10-changes	2024-05-21 10:09:28 -07:00
suspend.c
trace.c	cxl/region: Move cxl_trace_hpa() work to the region driver	2024-04-30 12:24:42 -07:00
trace.h	tracing/treewide: Remove second parameter of __assign_str()	2024-05-22 20:14:47 -04:00