Messages in this thread Patch in this message | | | From | ira.weiny@intel ... | Date | Sun, 24 Mar 2024 16:18:04 -0700 | Subject | [PATCH 01/26] cxl/mbox: Flag support for Dynamic Capacity Devices (DCD) |
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From: Navneet Singh <navneet.singh@intel.com>
Per the CXL 3.1 specification software must check the Command Effects Log (CEL) to know if a device supports dynamic capacity (DC). If the device does support DC the specifics of the DC Regions (0-7) are read through the mailbox.
Flag DC Device (DCD) commands in a device if they are supported. Subsequent patches will key off these bits to configure DCD.
Signed-off-by: Navneet Singh <navneet.singh@intel.com> Co-developed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> --- Changes for v1 [iweiny: update to latest master] [iweiny: update commit message] [iweiny: Based on the fix: https://lore.kernel.org/all/20230903-cxl-cel-fix-v1-1-e260c9467be3@intel.com/ [jonathan: remove unneeded format change] [jonathan: don't split security code in mbox.c] --- 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 9adda4795eb7..ed4131c6f50b 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -161,6 +161,34 @@ 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 @@ -733,6 +761,11 @@ 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 20fb3b35e89e..79a67cff9143 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -238,6 +238,15 @@ 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, @@ -454,6 +463,7 @@ struct cxl_dev_state { * (CXL 2.0 8.2.9.5.1.1 Identify Memory Device) * @mbox_mutex: Mutex to synchronize mailbox access. * @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 @@ -481,6 +491,7 @@ struct cxl_memdev_state { size_t lsa_size; struct mutex mbox_mutex; /* Protects device mailbox and firmware */ 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; @@ -551,6 +562,10 @@ 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 }; -- 2.44.0
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