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Sun, 13 Apr 2025 22:51:43 +0000 From: Ira Weiny Date: Sun, 13 Apr 2025 17:52:09 -0500 Subject: [PATCH v9 01/19] cxl/mbox: Flag support for Dynamic Capacity Devices (DCD) Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-ID: <20250413-dcd-type2-upstream-v9-1-1d4911a0b365@intel.com> References: <20250413-dcd-type2-upstream-v9-0-1d4911a0b365@intel.com> In-Reply-To: <20250413-dcd-type2-upstream-v9-0-1d4911a0b365@intel.com> To: Dave Jiang , Fan Ni , "Jonathan Cameron" CC: Dan Williams , Davidlohr Bueso , Alison Schofield , "Vishal Verma" , Ira Weiny , , , X-Mailer: b4 0.15-dev-c25d1 X-Developer-Signature: v=1; a=ed25519-sha256; t=1744584735; l=4586; i=ira.weiny@intel.com; s=20221211; h=from:subject:message-id; bh=ObXjYpSXhyIOJclFZabMVwT7Iw3oZ5eWVtgb3/GUyCU=; b=2CkaSSQAtgE6kCVfvIHhyyHvMDIIb4PkrgLRXi9PTyvh6B5OOscV117iFWBWpzulQYXQ15+ZB TLulNVfBTcJAn/0JcJ3cT3iGXIzqAZRZ7GQBpjinDbm3LUrrtKt0G4d X-Developer-Key: i=ira.weiny@intel.com; a=ed25519; pk=noldbkG+Wp1qXRrrkfY1QJpDf7QsOEthbOT7vm0PqsE= X-ClientProxiedBy: MW4PR03CA0227.namprd03.prod.outlook.com (2603:10b6:303:b9::22) To MW4PR11MB6739.namprd11.prod.outlook.com (2603:10b6:303:20b::19) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW4PR11MB6739:EE_|DM4PR11MB6042:EE_ X-MS-Office365-Filtering-Correlation-Id: 21404f0d-096c-4e56-bda3-08dd7addc322 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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Detect support for the DCD commands while reading the CEL, including: Get DC Config Get DC Extent List Add DC Response Release DC Based on an original patch by Navneet Singh. Signed-off-by: Ira Weiny --- Changes: [iweiny: rebased] [iweiny: remove tags] [djbw: remove dcd_cmds bitmask from mds] --- drivers/cxl/core/mbox.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 15 +++++++++++++++ 2 files changed, 59 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index d72764056ce6..58d378400a4b 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -165,6 +165,43 @@ static void cxl_set_security_cmd_enabled(struct cxl_se= curity_state *security, } } =20 +static bool cxl_is_dcd_command(u16 opcode) +{ +#define CXL_MBOX_OP_DCD_CMDS 0x48 + + return (opcode >> 8) =3D=3D CXL_MBOX_OP_DCD_CMDS; +} + +static void cxl_set_dcd_cmd_enabled(struct cxl_memdev_state *mds, u16 opco= de, + unsigned long *cmd_mask) +{ + switch (opcode) { + case CXL_MBOX_OP_GET_DC_CONFIG: + set_bit(CXL_DCD_ENABLED_GET_CONFIG, cmd_mask); + break; + case CXL_MBOX_OP_GET_DC_EXTENT_LIST: + set_bit(CXL_DCD_ENABLED_GET_EXTENT_LIST, cmd_mask); + break; + case CXL_MBOX_OP_ADD_DC_RESPONSE: + set_bit(CXL_DCD_ENABLED_ADD_RESPONSE, cmd_mask); + break; + case CXL_MBOX_OP_RELEASE_DC: + set_bit(CXL_DCD_ENABLED_RELEASE, cmd_mask); + break; + default: + break; + } +} + +static bool cxl_verify_dcd_cmds(struct cxl_memdev_state *mds, unsigned lon= g *cmds_seen) +{ + DECLARE_BITMAP(all_cmds, CXL_DCD_ENABLED_MAX); + DECLARE_BITMAP(dst, CXL_DCD_ENABLED_MAX); + + bitmap_fill(all_cmds, CXL_DCD_ENABLED_MAX); + return bitmap_and(dst, cmds_seen, all_cmds, CXL_DCD_ENABLED_MAX); +} + static bool cxl_is_poison_command(u16 opcode) { #define CXL_MBOX_OP_POISON_CMDS 0x43 @@ -750,6 +787,7 @@ static void cxl_walk_cel(struct cxl_memdev_state *mds, = size_t size, u8 *cel) struct cxl_mailbox *cxl_mbox =3D &mds->cxlds.cxl_mbox; struct cxl_cel_entry *cel_entry; const int cel_entries =3D size / sizeof(*cel_entry); + DECLARE_BITMAP(dcd_cmds, CXL_DCD_ENABLED_MAX); struct device *dev =3D mds->cxlds.dev; int i, ro_cmds =3D 0, wr_cmds =3D 0; =20 @@ -778,11 +816,17 @@ static void cxl_walk_cel(struct cxl_memdev_state *mds= , size_t size, u8 *cel) enabled++; } =20 + if (cxl_is_dcd_command(opcode)) { + cxl_set_dcd_cmd_enabled(mds, opcode, dcd_cmds); + enabled++; + } + dev_dbg(dev, "Opcode 0x%04x %s\n", opcode, enabled ? "enabled" : "unsupported by driver"); } =20 set_features_cap(cxl_mbox, ro_cmds, wr_cmds); + mds->dcd_supported =3D cxl_verify_dcd_cmds(mds, dcd_cmds); } =20 static struct cxl_mbox_get_supported_logs *cxl_get_gsl(struct cxl_memdev_s= tate *mds) diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 3ec6b906371b..394a776954f4 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -216,6 +216,15 @@ struct cxl_event_state { struct mutex log_lock; }; =20 +/* 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, @@ -472,6 +481,7 @@ static inline struct cxl_dev_state *mbox_to_cxlds(struc= t cxl_mailbox *cxl_mbox) * @partition_align_bytes: alignment size for partition-able capacity * @active_volatile_bytes: sum of hard + soft volatile * @active_persistent_bytes: sum of hard + soft persistent + * @dcd_supported: all DCD commands are supported * @event: event log driver state * @poison: poison driver state info * @security: security driver state info @@ -491,6 +501,7 @@ struct cxl_memdev_state { u64 partition_align_bytes; u64 active_volatile_bytes; u64 active_persistent_bytes; + bool dcd_supported; =20 struct cxl_event_state event; struct cxl_poison_state poison; @@ -551,6 +562,10 @@ enum cxl_opcode { CXL_MBOX_OP_UNLOCK =3D 0x4503, CXL_MBOX_OP_FREEZE_SECURITY =3D 0x4504, CXL_MBOX_OP_PASSPHRASE_SECURE_ERASE =3D 0x4505, + CXL_MBOX_OP_GET_DC_CONFIG =3D 0x4800, + CXL_MBOX_OP_GET_DC_EXTENT_LIST =3D 0x4801, + CXL_MBOX_OP_ADD_DC_RESPONSE =3D 0x4802, + CXL_MBOX_OP_RELEASE_DC =3D 0x4803, CXL_MBOX_OP_MAX =3D 0x10000 }; =20 --=20 2.49.0