linux-kernel - [PATCH 1/3] cxl: Set target type of root decoder based on CFMWS restrictions

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Message-Id: <20240729084611.502889-2-ying.huang@intel.com>
Date: Mon, 29 Jul 2024 16:46:09 +0800
From: Huang Ying <ying.huang@...el.com>
To: Dan Williams <dan.j.williams@...el.com>,
	Dave Jiang <dave.jiang@...el.com>
Cc: linux-cxl@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Huang Ying <ying.huang@...el.com>,
	Davidlohr Bueso <dave@...olabs.net>,
	Jonathan Cameron <jonathan.cameron@...wei.com>,
	Alison Schofield <alison.schofield@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Ira Weiny <ira.weiny@...el.com>,
	Alejandro Lucero <alucerop@....com>
Subject: [PATCH 1/3] cxl: Set target type of root decoder based on CFMWS restrictions

Now, the target type of root decoder is hard-coded to HOSTONLYMEM,
because only type3 expanders are supported.  To support type2
accelerators, set the target type of root decoder based on the
window restrictions field of CFMWS entry.

Signed-off-by: "Huang, Ying" <ying.huang@...el.com>
Suggested-by: Dan Williams <dan.j.williams@...el.com>
Cc: Davidlohr Bueso <dave@...olabs.net>
Cc: Jonathan Cameron <jonathan.cameron@...wei.com>
Cc: Dave Jiang <dave.jiang@...el.com>
Cc: Alison Schofield <alison.schofield@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Alejandro Lucero <alucerop@....com>
---
 drivers/cxl/acpi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/acpi.c b/drivers/cxl/acpi.c
index 82b78e331d8e..40c92ad29122 100644
--- a/drivers/cxl/acpi.c
+++ b/drivers/cxl/acpi.c
@@ -382,7 +382,10 @@ static int __cxl_parse_cfmws(struct acpi_cedt_cfmws *cfmws,
 
 	cxld = &cxlrd->cxlsd.cxld;
 	cxld->flags = cfmws_to_decoder_flags(cfmws->restrictions);
-	cxld->target_type = CXL_DECODER_HOSTONLYMEM;
+	if (cxld->flags & CXL_DECODER_F_TYPE2)
+		cxld->target_type = CXL_DECODER_DEVMEM;
+	else
+		cxld->target_type = CXL_DECODER_HOSTONLYMEM;
 	cxld->hpa_range = (struct range) {
 		.start = cfmws->base_hpa,
 		.end = cfmws->base_hpa + cfmws->window_size - 1,
-- 
2.39.2