This series adds support for hotplug of NVDIMMs. Upon hotplug, the ACPI core calls the .notify callback we register. From this, we evaluate the _FIT method which returns an updated NFIT. This is scanned for any new tables, and any new regions found from it are registered and made available for use. The series is tested with nfit_test (tools/testing/nvdimm) only, which means the parts of getting a notification from the acpi core, and calling _FIT are untested. Changes from v2->v3: - in acpi_nfit_init, splice off the old contents if to a "prev" list and only check for duplicates when "prev" is not empty (Dan) - in acpi_nfit_init, error out if tables are found to be deleted - locking changes: Use device_lock for .add and .notify. Check if dev->driver is valid during notify to protect against a prior removal (Dan) - Change IS_ERR_OR_NULL to IS_ERR for acpi_nfit_desc_init (Dan) - nfit_test: for the hot-plug DIMM, add a flush hint table too for completeness Changes from v1->v2: - If a 0-length header is found in the nfit (patch 1), also spew a warning (Jeff) - Don't make a new acpi_evaluate_fit helper - open code a call to acpi_evaluate_object in nfit.c (Dan/Rafael) - Remove a warning for duplicate DCRs (Toshi) - Add an init_lock to protect the notify handler from racing with an 'add' or 'remove' (Dan) - The only NVDIMM in a system *could* potentially come from a hotplug, esp in the virtualization case. Refactor how acpi_nfit_desc is initialized to account for this. For the same reason, don't fail when a valid NFIT is not found at driver load time. A by-product of this change is that we need to initialize lists and mutexes manually in nfit test. (Dan) - Remove acpi_nfit_merge (added in v1) as it is now essentially the same as acpi_nfit_init - Reword the commit message for patch 2/2 to say 'hot add' instead of hotplug, making it clearer that hot removal support is not being added Vishal Verma (2): nfit: in acpi_nfit_init, break on a 0-length table acpi: nfit: Add support for hot-add drivers/acpi/nfit.c | 307 +++++++++++++++++++++++++++++++-------- drivers/acpi/nfit.h | 2 + tools/testing/nvdimm/test/nfit.c | 164 ++++++++++++++++++++- 3 files changed, 413 insertions(+), 60 deletions(-) -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
