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Date: Wed, 24 Mar 2021 14:30:46 -0700
From: Dan Williams <dan.j.williams@...el.com>
To: linux-cxl@...r.kernel.org
Cc: linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
ira.weiny@...el.com, vishal.l.verma@...el.com,
alison.schofield@...el.com, ben.widawsky@...el.com,
linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] cxl/core: Refactor CXL register lookup for bridge reuse
While CXL Memory Device endpoints locate the CXL MMIO registers in a PCI
BAR, CXL root bridges have their MMIO base address described by platform
firmware. Refactor the existing register lookup into a generic facility
for endpoints and bridges to share.
Reviewed-by: Ben Widawsky <ben.widawsky@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
drivers/cxl/core.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++-
drivers/cxl/cxl.h | 3 +++
drivers/cxl/mem.c | 50 +++++-----------------------------------------
3 files changed, 65 insertions(+), 45 deletions(-)
diff --git a/drivers/cxl/core.c b/drivers/cxl/core.c
index 7f8d2034038a..2ab467ef9909 100644
--- a/drivers/cxl/core.c
+++ b/drivers/cxl/core.c
@@ -1,7 +1,8 @@
// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright(c) 2020 Intel Corporation. All rights reserved. */
+/* Copyright(c) 2020-2021 Intel Corporation. All rights reserved. */
#include <linux/device.h>
#include <linux/module.h>
+#include "cxl.h"
/**
* DOC: cxl core
@@ -10,6 +11,60 @@
* point for cross-device interleave coordination through cxl ports.
*/
+/*
+ * cxl_setup_device_regs() - Detect CXL Device register blocks
+ * @dev: Host device of the @base mapping
+ * @base: mapping of CXL 2.0 8.2.8 CXL Device Register Interface
+ */
+void cxl_setup_device_regs(struct device *dev, void __iomem *base,
+ struct cxl_device_regs *regs)
+{
+ int cap, cap_count;
+ u64 cap_array;
+
+ *regs = (struct cxl_device_regs) { 0 };
+
+ cap_array = readq(base + CXLDEV_CAP_ARRAY_OFFSET);
+ if (FIELD_GET(CXLDEV_CAP_ARRAY_ID_MASK, cap_array) !=
+ CXLDEV_CAP_ARRAY_CAP_ID)
+ return;
+
+ cap_count = FIELD_GET(CXLDEV_CAP_ARRAY_COUNT_MASK, cap_array);
+
+ for (cap = 1; cap <= cap_count; cap++) {
+ void __iomem *register_block;
+ u32 offset;
+ u16 cap_id;
+
+ cap_id = FIELD_GET(CXLDEV_CAP_HDR_CAP_ID_MASK,
+ readl(base + cap * 0x10));
+ offset = readl(base + cap * 0x10 + 0x4);
+ register_block = base + offset;
+
+ switch (cap_id) {
+ case CXLDEV_CAP_CAP_ID_DEVICE_STATUS:
+ dev_dbg(dev, "found Status capability (0x%x)\n", offset);
+ regs->status = register_block;
+ break;
+ case CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX:
+ dev_dbg(dev, "found Mailbox capability (0x%x)\n", offset);
+ regs->mbox = register_block;
+ break;
+ case CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX:
+ dev_dbg(dev, "found Secondary Mailbox capability (0x%x)\n", offset);
+ break;
+ case CXLDEV_CAP_CAP_ID_MEMDEV:
+ dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset);
+ regs->memdev = register_block;
+ break;
+ default:
+ dev_dbg(dev, "Unknown cap ID: %d (0x%x)\n", cap_id, offset);
+ break;
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(cxl_setup_device_regs);
+
struct bus_type cxl_bus_type = {
.name = "cxl",
};
diff --git a/drivers/cxl/cxl.h b/drivers/cxl/cxl.h
index 37325e504fb7..cbd29650c4e2 100644
--- a/drivers/cxl/cxl.h
+++ b/drivers/cxl/cxl.h
@@ -67,5 +67,8 @@ struct cxl_regs {
};
};
+void cxl_setup_device_regs(struct device *dev, void __iomem *base,
+ struct cxl_device_regs *regs);
+
extern struct bus_type cxl_bus_type;
#endif /* __CXL_H__ */
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index 6951243d128e..ee55abfa147e 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -865,53 +865,15 @@ static int cxl_mem_mbox_send_cmd(struct cxl_mem *cxlm, u16 opcode,
static int cxl_mem_setup_regs(struct cxl_mem *cxlm)
{
struct device *dev = &cxlm->pdev->dev;
- int cap, cap_count;
- u64 cap_array;
+ struct cxl_regs *regs = &cxlm->regs;
- cap_array = readq(cxlm->base + CXLDEV_CAP_ARRAY_OFFSET);
- if (FIELD_GET(CXLDEV_CAP_ARRAY_ID_MASK, cap_array) !=
- CXLDEV_CAP_ARRAY_CAP_ID)
- return -ENODEV;
-
- cap_count = FIELD_GET(CXLDEV_CAP_ARRAY_COUNT_MASK, cap_array);
-
- for (cap = 1; cap <= cap_count; cap++) {
- void __iomem *register_block;
- u32 offset;
- u16 cap_id;
-
- cap_id = FIELD_GET(CXLDEV_CAP_HDR_CAP_ID_MASK,
- readl(cxlm->base + cap * 0x10));
- offset = readl(cxlm->base + cap * 0x10 + 0x4);
- register_block = cxlm->base + offset;
-
- switch (cap_id) {
- case CXLDEV_CAP_CAP_ID_DEVICE_STATUS:
- dev_dbg(dev, "found Status capability (0x%x)\n", offset);
- cxlm->regs.status = register_block;
- break;
- case CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX:
- dev_dbg(dev, "found Mailbox capability (0x%x)\n", offset);
- cxlm->regs.mbox = register_block;
- break;
- case CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX:
- dev_dbg(dev, "found Secondary Mailbox capability (0x%x)\n", offset);
- break;
- case CXLDEV_CAP_CAP_ID_MEMDEV:
- dev_dbg(dev, "found Memory Device capability (0x%x)\n", offset);
- cxlm->regs.memdev = register_block;
- break;
- default:
- dev_dbg(dev, "Unknown cap ID: %d (0x%x)\n", cap_id, offset);
- break;
- }
- }
+ cxl_setup_device_regs(dev, cxlm->base, ®s->device_regs);
- if (!cxlm->regs.status || !cxlm->regs.mbox || !cxlm->regs.memdev) {
+ if (!regs->status || !regs->mbox || !regs->memdev) {
dev_err(dev, "registers not found: %s%s%s\n",
- !cxlm->regs.status ? "status " : "",
- !cxlm->regs.mbox ? "mbox " : "",
- !cxlm->regs.memdev ? "memdev" : "");
+ !regs->status ? "status " : "",
+ !regs->mbox ? "mbox " : "",
+ !regs->memdev ? "memdev" : "");
return -ENXIO;
}
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