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X-OriginatorOrg: micron.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Oct 2024 04:32:12.4900 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 73518fbe-6f6a-427e-6618-08dced9b815f X-MS-Exchange-CrossTenant-Id: f38a5ecd-2813-4862-b11b-ac1d563c806f X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f38a5ecd-2813-4862-b11b-ac1d563c806f;Ip=[137.201.242.130];Helo=[mail.micron.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF00001505.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH4PR08MB10537 Allows 5s wait when no timeout parameter is explicitly mentioned. It is useful for mailbox commands to be executed in background when initiated from userspace. Link: https://lore.kernel.org/linux-mm/20240215123410.00003b8c@Huawei.com/T/ Signed-off-by: Ravi Shankar --- =A0drivers/cxl/pci.c | 13 +++++++++++++ =A01 file changed, 13 insertions(+) diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 188412d45e0d..d5d6142f6aa3 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -41,6 +41,10 @@ =A0/* CXL 2.0 - 8.2.8.4 */ =A0#define CXL_MAILBOX_TIMEOUT_MS (2 * HZ) =A0 +/* Default timeout for background operations */ +#define CXL_BG_POLL_CNT=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0 5 +#define CXL_BG_POLL_INTERVAL_MS=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0 1000 + =A0/* =A0 * CXL 2.0 ECN "Add Mailbox Ready Time" defines a capability field to =A0 * dictate how long to wait for the mailbox to become ready. The new @@ -317,6 +321,15 @@ static int __cxl_pci_mbox_send_cmd(struct cxl_mailbox = *cxl_mbox, =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 dev_dbg(dev, "Mailbox back= ground operation (0x%04x) started\n", =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 mb= ox_cmd->opcode); =A0 +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 /* +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 * Add a default timeout of 5= seconds when background operation +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 * starts but no timeout is s= pecified. +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 */ +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 if (!mbox_cmd->poll_interval_ms= ) { +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 mbox_cm= d->poll_interval_ms =3D CXL_BG_POLL_INTERVAL_MS; +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 mbox_cm= d->poll_count =3D CXL_BG_POLL_CNT; +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 } + =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 timeout =3D mbox_cmd->poll= _interval_ms; =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 for (i =3D 0; i < mbox_cmd= ->poll_count; i++) { =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 if= (rcuwait_wait_event_timeout(&cxl_mbox->mbox_wait, --=20 2.43.0 =