| Message ID | 20201030023242.5204-1-dmitry.fomichev@wdc.com |
|---|---|
| Headers | show |
| Series | hw/block/nvme: Support Namespace Types and Zoned Namespace Command Set | expand |
On Oct 30 11:32, Dmitry Fomichev wrote: > From: Niklas Cassel <niklas.cassel@wdc.com> > > Many CNS commands have "allocated" command variants. These include > a namespace as long as it is allocated, that is a namespace is > included regardless if it is active (attached) or not. > > While these commands are optional (they are mandatory for controllers > supporting the namespace attachment command), our QEMU implementation > is more complete by actually providing support for these CNS values. > > However, since our QEMU model currently does not support the namespace > attachment command, these new allocated CNS commands will return the > same result as the active CNS command variants. > > In NVMe, a namespace is active if it exists and is attached to the > controller. > > Add a new Boolean namespace flag, "attached", to provide the most > basic namespace attachment support. The default value for this new > flag is true. Also, implement the logic in the new CNS values to > include/exclude namespaces based on this new property. The only thing > missing is hooking up the actual Namespace Attachment command opcode, > which will allow a user to toggle the "attached" flag per namespace. > > The reason for not hooking up this command completely is because the > NVMe specification requires the namespace management command to be > supported if the namespace attachment command is supported. > > Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> > Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com> > Reviewed-by: Keith Busch <kbusch@kernel.org> > --- Please rip out all the ns->attached conditionals (it's dead code). Just add the new CNS values in the switch and let them fall through.
v7 -> v8: - Move refactoring commits to the front of the series. - Remove "attached" and "fill_pattern" device properties. - Only close open zones upon subsystem shutdown, not when CC.EN flag is set to 0. Avoid looping through all zones by iterating through lists of open and closed zones. - Improve bulk processing of zones aka zoned operations with "all" flag set. Avoid looping through the entire zone array for all zone operations except Offline Zone. - Prefix ZNS-related property names with "zoned.". The "zoned" Boolean property is retained to turn on zoned command set as it is much more intuitive and user-friendly compared to setting a magic number value to csi property. - Address review comments. - Remove unused trace events. v6 -> v7: - Introduce ns->iocs initialization function earlier in the series, in CSE Log patch. - Set NVM iocs for zoned namespaces when CC.CSS is set to NVME_CC_CSS_NVM. - Clean up code in CSE log handler. v5 -> v6: - Remove zoned state persistence code. Replace position-independent zone lists with QTAILQs. - Close all open zones upon clearing of the controller. This is a similar procedure to the one previously performed upon powering up with zone persistence. - Squash NS Types and ZNS triplets of commits to keep definitions and trace event definitions together with the implementation code. - Move namespace UUID generation to a separate patch. Add the new "uuid" property as suggested by Klaus. - Rework Commands and Effects patch to make sure that the log is always in sync with the actual set of commands supported. - Add two refactoring commits at the end of the series to optimize read and write i/o path. - Incorporate feedback from Keith, Klaus and Niklas: * fix rebase errors in nvme_identify_ns_descr_list() * remove unnecessary code from nvme_write_bar() * move csi to NvmeNamespace and use it from the beginning in NSTypes patch * change zone read processing to cover all corner cases with RAZB=1 * sync w_ptr and d.wp in case of a i/o error at the preceding zone * reword the commit message in active/inactive patch with the new text from Niklas * correct dlfeat reporting depending on the fill pattern set * add more checks for "attached" n/s parameter to prevent i/o and get/set features on inactive namespaces * Use DEFINE_PROP_SIZE and DEFINE_PROP_SIZE32 for zone size/capacity and ZASL respectively * Improve zone size and capacity validation * Correctly report NSZE v4 -> v5: - Rebase to the current qemu-nvme. - Use HostMemoryBackendFile as the backing storage for persistent zone metadata. - Fix the issue with filling the valid data in the next zone if RAZB is enabled. v3 -> v4: - Fix bugs introduced in v2/v3 for QD > 1 operation. Now, all writes to a zone happen at the new write pointer variable, zone->w_ptr, that is advanced right after submitting the backend i/o. The existing zone->d.wp variable is updated upon the successful write completion and it is used for zone reporting. Some code has been split from nvme_finalize_zoned_write() function to a new function, nvme_advance_zone_wp(). - Make the code compile under mingw. Switch to using QEMU API for mmap/msync, i.e. memory_region...(). Since mmap is not available in mingw (even though there is mman-win32 library available on Github), conditional compilation is added around these calls to avoid undefined symbols under mingw. A better fix would be to add stub functions to softmmu/memory.c for the case when CONFIG_POSIX is not defined, but such change is beyond the scope of this patchset and it can be made in a separate patch. - Correct permission mask used to open zone metadata file. - Fold "Define 64 bit cqe.result" patch into ZNS commit. - Use clz64/clz32 instead of defining nvme_ilog2() function. - Simplify rpt_empty_id_struct() code, move nvme_fill_data() back to ZNS patch. - Fix a power-on processing bug. - Rename NVME_CMD_ZONE_APND to NVME_CMD_ZONE_APPEND. - Make the list of review comments addressed in v2 of the series (see below). v2 -> v3: - Moved nvme_fill_data() function to the NSTypes patch as it is now used there to output empty namespace identify structs. - Fixed typo in Maxim's email address. v1 -> v2: - Rebased on top of qemu-nvme/next branch. - Incorporated feedback from Klaus and Alistair. * Allow a subset of CSE log to be read, not the entire log * Assign admin command entries in CSE log to ACS fields * Set LPA bit 1 to indicate support of CSE log page * Rename CC.CSS value CSS_ALL_NSTYPES (110b) to CSS_CSI * Move the code to assign lbaf.ds to a separate patch * Remove the change in firmware revision * Change "driver" to "device" in comments and annotations * Rename ZAMDS to ZASL * Correct a few format expressions and some wording in trace event definitions * Remove validation code to return NVME_CAP_EXCEEDED error * Make ZASL to be equal to MDTS if "zone_append_size_limit" module parameter is not set * Clean up nvme_zoned_init_ctrl() to make size calculations less confusing * Avoid changing module parameters, use separate n/s variables if additional calculations are necessary to convert parameters to running values * Use NVME_DEFAULT_ZONE_SIZE to assign the default zone size value * Use default 0 for zone capacity meaning that zone capacity will be equal to zone size by default * Issue warnings if user MAR/MOR values are too large and have to be adjusted * Use unsigned values for MAR/MOR - Dropped "Simulate Zone Active excursions" patch. Excursion behavior may depend on the internal controller architecture and therefore be vendor-specific. - Dropped support for Zone Attributes and zoned AENs for now. These features can be added in a future series. - NS Types support is extended to handle active/inactive namespaces. - Update the write pointer after backing storage I/O completion, not before. This makes the emulation to run correctly in case of backing device failures. - Avoid division in the I/O path if the device zone size is a power of two (the most common case). Zone index then can be calculated by using bit shift. - A few reported bugs have been fixed. - Indentation in function definitions has been changed to make it the same as the rest of the code. Zoned Namespace (ZNS) Command Set is a newly introduced command set published by the NVM Express, Inc. organization as TP 4053. The main design goals of ZNS are to provide hardware designers the means to reduce NVMe controller complexity and to allow achieving a better I/O latency and throughput. SSDs that implement this interface are commonly known as ZNS SSDs. This command set is implementing a zoned storage model, similarly to ZAC/ZBC. As such, there is already support in Linux, allowing one to perform the majority of tasks needed for managing ZNS SSDs. The Zoned Namespace Command Set relies on another TP, known as Namespace Types (NVMe TP 4056), which introduces support for having multiple command sets per namespace. Both ZNS and Namespace Types specifications can be downloaded by visiting the following link - https://nvmexpress.org/wp-content/uploads/NVM-Express-1.4-Ratified-TPs.zip This patch series adds Namespace Types support and zoned namespace emulation capability to the existing NVMe PCI device. Based-on: <20201013174826.GA1049145@dhcp-10-100-145-180.wdl.wdc.com> Dmitry Fomichev (9): hw/block/nvme: Add Commands Supported and Effects log hw/block/nvme: Generate namespace UUIDs hw/block/nvme: Separate read and write handlers hw/block/nvme: Merge nvme_write_zeroes() with nvme_write() hw/block/nvme: Support Zoned Namespace Command Set hw/block/nvme: Introduce max active and open zone limits hw/block/nvme: Support Zone Descriptor Extensions hw/block/nvme: Add injection of Offline/Read-Only zones hw/block/nvme: Document zoned parameters in usage text Niklas Cassel (2): hw/block/nvme: Add support for Namespace Types hw/block/nvme: Support allocated CNS command variants block/nvme.c | 2 +- hw/block/nvme-ns.c | 276 +++++++ hw/block/nvme-ns.h | 109 +++ hw/block/nvme.c | 1615 ++++++++++++++++++++++++++++++++++++++--- hw/block/nvme.h | 8 + hw/block/trace-events | 32 +- include/block/nvme.h | 204 +++++- 7 files changed, 2113 insertions(+), 133 deletions(-)