From: Navneet Singh <navneet.singh@xxxxxxxxx> Per the CXL 3.1 specification software must check the Command Effects Log (CEL) for dynamic capacity command support. Detect support for the DCD commands while reading the CEL, including: Get DC Config Get DC Extent List Add DC Response Release DC Signed-off-by: Navneet Singh <navneet.singh@xxxxxxxxx> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Reviewed-by: Fan Ni <fan.ni@xxxxxxxxxxx> Reviewed-by: Dave Jiang <dave.jiang@xxxxxxxxx> Reviewed-by: Davidlohr Bueso <dave@xxxxxxxxxxxx> Reviewed-by: Li Ming <ming4.li@xxxxxxxxx> Co-developed-by: Ira Weiny <ira.weiny@xxxxxxxxx> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx> --- Changes: [iweiny: Keep tags for this early simple patch] [Davidlohr: update commit message] [djiang: Fix misalignment] --- drivers/cxl/core/mbox.c | 33 +++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 15 +++++++++++++++ 2 files changed, 48 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 5175138c4fb7382426145640d7d04967b02b22dc..aac3bfc0d2c3f916dd870b9f8288b24d90fc9974 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -164,6 +164,34 @@ static void cxl_set_security_cmd_enabled(struct cxl_security_state *security, } } +static bool cxl_is_dcd_command(u16 opcode) +{ +#define CXL_MBOX_OP_DCD_CMDS 0x48 + + return (opcode >> 8) == CXL_MBOX_OP_DCD_CMDS; +} + +static void cxl_set_dcd_cmd_enabled(struct cxl_memdev_state *mds, + u16 opcode) +{ + switch (opcode) { + case CXL_MBOX_OP_GET_DC_CONFIG: + set_bit(CXL_DCD_ENABLED_GET_CONFIG, mds->dcd_cmds); + break; + case CXL_MBOX_OP_GET_DC_EXTENT_LIST: + set_bit(CXL_DCD_ENABLED_GET_EXTENT_LIST, mds->dcd_cmds); + break; + case CXL_MBOX_OP_ADD_DC_RESPONSE: + set_bit(CXL_DCD_ENABLED_ADD_RESPONSE, mds->dcd_cmds); + break; + case CXL_MBOX_OP_RELEASE_DC: + set_bit(CXL_DCD_ENABLED_RELEASE, mds->dcd_cmds); + break; + default: + break; + } +} + static bool cxl_is_poison_command(u16 opcode) { #define CXL_MBOX_OP_POISON_CMDS 0x43 @@ -751,6 +779,11 @@ static void cxl_walk_cel(struct cxl_memdev_state *mds, size_t size, u8 *cel) enabled++; } + if (cxl_is_dcd_command(opcode)) { + cxl_set_dcd_cmd_enabled(mds, opcode); + enabled++; + } + dev_dbg(dev, "Opcode 0x%04x %s\n", opcode, enabled ? "enabled" : "unsupported by driver"); } diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 2a25d1957ddb9772b8d4dca92534ba76a909f8b3..e8907c403edbd83c8a36b8d013c6bc3391207ee6 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -239,6 +239,15 @@ struct cxl_event_state { struct mutex log_lock; }; +/* Device enabled DCD commands */ +enum dcd_cmd_enabled_bits { + CXL_DCD_ENABLED_GET_CONFIG, + CXL_DCD_ENABLED_GET_EXTENT_LIST, + CXL_DCD_ENABLED_ADD_RESPONSE, + CXL_DCD_ENABLED_RELEASE, + CXL_DCD_ENABLED_MAX +}; + /* Device enabled poison commands */ enum poison_cmd_enabled_bits { CXL_POISON_ENABLED_LIST, @@ -461,6 +470,7 @@ static inline struct cxl_dev_state *mbox_to_cxlds(struct cxl_mailbox *cxl_mbox) * @lsa_size: Size of Label Storage Area * (CXL 2.0 8.2.9.5.1.1 Identify Memory Device) * @firmware_version: Firmware version for the memory device. + * @dcd_cmds: List of DCD commands implemented by memory device * @enabled_cmds: Hardware commands found enabled in CEL. * @exclusive_cmds: Commands that are kernel-internal only * @total_bytes: sum of all possible capacities @@ -485,6 +495,7 @@ struct cxl_memdev_state { struct cxl_dev_state cxlds; size_t lsa_size; char firmware_version[0x10]; + DECLARE_BITMAP(dcd_cmds, CXL_DCD_ENABLED_MAX); DECLARE_BITMAP(enabled_cmds, CXL_MEM_COMMAND_ID_MAX); DECLARE_BITMAP(exclusive_cmds, CXL_MEM_COMMAND_ID_MAX); u64 total_bytes; @@ -554,6 +565,10 @@ enum cxl_opcode { CXL_MBOX_OP_UNLOCK = 0x4503, CXL_MBOX_OP_FREEZE_SECURITY = 0x4504, CXL_MBOX_OP_PASSPHRASE_SECURE_ERASE = 0x4505, + CXL_MBOX_OP_GET_DC_CONFIG = 0x4800, + CXL_MBOX_OP_GET_DC_EXTENT_LIST = 0x4801, + CXL_MBOX_OP_ADD_DC_RESPONSE = 0x4802, + CXL_MBOX_OP_RELEASE_DC = 0x4803, CXL_MBOX_OP_MAX = 0x10000 }; -- 2.47.0