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Date: Fri, 28 Jun 2024 00:46:10 +0200
From: Robert Richter <rrichter@....com>
To: Dan Williams <dan.j.williams@...el.com>, Davidlohr Bueso
<dave@...olabs.net>, Jonathan Cameron <jonathan.cameron@...wei.com>, "Dave
Jiang" <dave.jiang@...el.com>, Alison Schofield <alison.schofield@...el.com>,
Vishal Verma <vishal.l.verma@...el.com>, Ira Weiny <ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <linux-cxl@...r.kernel.org>, "Robert
Richter" <rrichter@....com>
Subject: [PATCH 1/5] cxl/hdm: Moving HDM specific code to core/hdm.c.
Code to handle HDM specifics is implemented in core/pci.c and
core/hdm.c. In both files helper functions will be needed for address
translation. To simplify the introduction of static helper functions,
move all HDM code to core/hdm.c.
The function devm_cxl_enable_mem() is no longer static and is shared
now within the core module. No functional changes otherwise.
Signed-off-by: Robert Richter <rrichter@....com>
---
drivers/cxl/core/core.h | 2 +
drivers/cxl/core/hdm.c | 117 +++++++++++++++++++++++++++++++++++++++
drivers/cxl/core/pci.c | 119 +---------------------------------------
drivers/cxl/cxlmem.h | 3 +
drivers/cxl/cxlpci.h | 3 -
5 files changed, 123 insertions(+), 121 deletions(-)
diff --git a/drivers/cxl/core/core.h b/drivers/cxl/core/core.h
index 625394486459..d8c3c27ce100 100644
--- a/drivers/cxl/core/core.h
+++ b/drivers/cxl/core/core.h
@@ -70,6 +70,8 @@ int cxl_query_cmd(struct cxl_memdev *cxlmd,
int cxl_send_cmd(struct cxl_memdev *cxlmd, struct cxl_send_command __user *s);
void __iomem *devm_cxl_iomap_block(struct device *dev, resource_size_t addr,
resource_size_t length);
+struct cxl_dev_state;
+int devm_cxl_enable_mem(struct device *host, struct cxl_dev_state *cxlds);
struct dentry *cxl_debugfs_create_dir(const char *dir);
int cxl_dpa_set_mode(struct cxl_endpoint_decoder *cxled,
diff --git a/drivers/cxl/core/hdm.c b/drivers/cxl/core/hdm.c
index 784843fa2a22..605da9a55d89 100644
--- a/drivers/cxl/core/hdm.c
+++ b/drivers/cxl/core/hdm.c
@@ -1027,3 +1027,120 @@ int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm,
return 0;
}
EXPORT_SYMBOL_NS_GPL(devm_cxl_enumerate_decoders, CXL);
+
+/* require dvsec ranges to be covered by a locked platform window */
+static int dvsec_range_allowed(struct device *dev, void *arg)
+{
+ struct range *dev_range = arg;
+ struct cxl_decoder *cxld;
+
+ if (!is_root_decoder(dev))
+ return 0;
+
+ cxld = to_cxl_decoder(dev);
+
+ if (!(cxld->flags & CXL_DECODER_F_RAM))
+ return 0;
+
+ return range_contains(&cxld->hpa_range, dev_range);
+}
+
+static void disable_hdm(void *_cxlhdm)
+{
+ u32 global_ctrl;
+ struct cxl_hdm *cxlhdm = _cxlhdm;
+ void __iomem *hdm = cxlhdm->regs.hdm_decoder;
+
+ global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
+ writel(global_ctrl & ~CXL_HDM_DECODER_ENABLE,
+ hdm + CXL_HDM_DECODER_CTRL_OFFSET);
+}
+
+static int devm_cxl_enable_hdm(struct device *host, struct cxl_hdm *cxlhdm)
+{
+ void __iomem *hdm = cxlhdm->regs.hdm_decoder;
+ u32 global_ctrl;
+
+ global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
+ writel(global_ctrl | CXL_HDM_DECODER_ENABLE,
+ hdm + CXL_HDM_DECODER_CTRL_OFFSET);
+
+ return devm_add_action_or_reset(host, disable_hdm, cxlhdm);
+}
+
+/**
+ * cxl_hdm_decode_init() - Setup HDM decoding for the endpoint
+ * @cxlds: Device state
+ * @cxlhdm: Mapped HDM decoder Capability
+ * @info: Cached DVSEC range registers info
+ *
+ * Try to enable the endpoint's HDM Decoder Capability
+ */
+int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
+ struct cxl_endpoint_dvsec_info *info)
+{
+ void __iomem *hdm = cxlhdm->regs.hdm_decoder;
+ struct cxl_port *port = cxlhdm->port;
+ struct device *dev = cxlds->dev;
+ struct cxl_port *root;
+ int i, rc, allowed;
+ u32 global_ctrl = 0;
+
+ if (hdm)
+ global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
+
+ /*
+ * If the HDM Decoder Capability is already enabled then assume
+ * that some other agent like platform firmware set it up.
+ */
+ if (global_ctrl & CXL_HDM_DECODER_ENABLE || (!hdm && info->mem_enabled))
+ return devm_cxl_enable_mem(&port->dev, cxlds);
+ else if (!hdm)
+ return -ENODEV;
+
+ root = to_cxl_port(port->dev.parent);
+ while (!is_cxl_root(root) && is_cxl_port(root->dev.parent))
+ root = to_cxl_port(root->dev.parent);
+ if (!is_cxl_root(root)) {
+ dev_err(dev, "Failed to acquire root port for HDM enable\n");
+ return -ENODEV;
+ }
+
+ for (i = 0, allowed = 0; info->mem_enabled && i < info->ranges; i++) {
+ struct device *cxld_dev;
+
+ cxld_dev = device_find_child(&root->dev, &info->dvsec_range[i],
+ dvsec_range_allowed);
+ if (!cxld_dev) {
+ dev_dbg(dev, "DVSEC Range%d denied by platform\n", i);
+ continue;
+ }
+ dev_dbg(dev, "DVSEC Range%d allowed by platform\n", i);
+ put_device(cxld_dev);
+ allowed++;
+ }
+
+ if (!allowed && info->mem_enabled) {
+ dev_err(dev, "Range register decodes outside platform defined CXL ranges.\n");
+ return -ENXIO;
+ }
+
+ /*
+ * Per CXL 2.0 Section 8.1.3.8.3 and 8.1.3.8.4 DVSEC CXL Range 1 Base
+ * [High,Low] when HDM operation is enabled the range register values
+ * are ignored by the device, but the spec also recommends matching the
+ * DVSEC Range 1,2 to HDM Decoder Range 0,1. So, non-zero info->ranges
+ * are expected even though Linux does not require or maintain that
+ * match. If at least one DVSEC range is enabled and allowed, skip HDM
+ * Decoder Capability Enable.
+ */
+ if (info->mem_enabled)
+ return 0;
+
+ rc = devm_cxl_enable_hdm(&port->dev, cxlhdm);
+ if (rc)
+ return rc;
+
+ return devm_cxl_enable_mem(&port->dev, cxlds);
+}
+EXPORT_SYMBOL_NS_GPL(cxl_hdm_decode_init, CXL);
diff --git a/drivers/cxl/core/pci.c b/drivers/cxl/core/pci.c
index 8567dd11eaac..4f67e3ae7a05 100644
--- a/drivers/cxl/core/pci.c
+++ b/drivers/cxl/core/pci.c
@@ -270,7 +270,7 @@ static void clear_mem_enable(void *cxlds)
cxl_set_mem_enable(cxlds, 0);
}
-static int devm_cxl_enable_mem(struct device *host, struct cxl_dev_state *cxlds)
+int devm_cxl_enable_mem(struct device *host, struct cxl_dev_state *cxlds)
{
int rc;
@@ -282,46 +282,6 @@ static int devm_cxl_enable_mem(struct device *host, struct cxl_dev_state *cxlds)
return devm_add_action_or_reset(host, clear_mem_enable, cxlds);
}
-/* require dvsec ranges to be covered by a locked platform window */
-static int dvsec_range_allowed(struct device *dev, void *arg)
-{
- struct range *dev_range = arg;
- struct cxl_decoder *cxld;
-
- if (!is_root_decoder(dev))
- return 0;
-
- cxld = to_cxl_decoder(dev);
-
- if (!(cxld->flags & CXL_DECODER_F_RAM))
- return 0;
-
- return range_contains(&cxld->hpa_range, dev_range);
-}
-
-static void disable_hdm(void *_cxlhdm)
-{
- u32 global_ctrl;
- struct cxl_hdm *cxlhdm = _cxlhdm;
- void __iomem *hdm = cxlhdm->regs.hdm_decoder;
-
- global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
- writel(global_ctrl & ~CXL_HDM_DECODER_ENABLE,
- hdm + CXL_HDM_DECODER_CTRL_OFFSET);
-}
-
-static int devm_cxl_enable_hdm(struct device *host, struct cxl_hdm *cxlhdm)
-{
- void __iomem *hdm = cxlhdm->regs.hdm_decoder;
- u32 global_ctrl;
-
- global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
- writel(global_ctrl | CXL_HDM_DECODER_ENABLE,
- hdm + CXL_HDM_DECODER_CTRL_OFFSET);
-
- return devm_add_action_or_reset(host, disable_hdm, cxlhdm);
-}
-
int cxl_dvsec_rr_decode(struct device *dev, int d,
struct cxl_endpoint_dvsec_info *info)
{
@@ -425,83 +385,6 @@ int cxl_dvsec_rr_decode(struct device *dev, int d,
}
EXPORT_SYMBOL_NS_GPL(cxl_dvsec_rr_decode, CXL);
-/**
- * cxl_hdm_decode_init() - Setup HDM decoding for the endpoint
- * @cxlds: Device state
- * @cxlhdm: Mapped HDM decoder Capability
- * @info: Cached DVSEC range registers info
- *
- * Try to enable the endpoint's HDM Decoder Capability
- */
-int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
- struct cxl_endpoint_dvsec_info *info)
-{
- void __iomem *hdm = cxlhdm->regs.hdm_decoder;
- struct cxl_port *port = cxlhdm->port;
- struct device *dev = cxlds->dev;
- struct cxl_port *root;
- int i, rc, allowed;
- u32 global_ctrl = 0;
-
- if (hdm)
- global_ctrl = readl(hdm + CXL_HDM_DECODER_CTRL_OFFSET);
-
- /*
- * If the HDM Decoder Capability is already enabled then assume
- * that some other agent like platform firmware set it up.
- */
- if (global_ctrl & CXL_HDM_DECODER_ENABLE || (!hdm && info->mem_enabled))
- return devm_cxl_enable_mem(&port->dev, cxlds);
- else if (!hdm)
- return -ENODEV;
-
- root = to_cxl_port(port->dev.parent);
- while (!is_cxl_root(root) && is_cxl_port(root->dev.parent))
- root = to_cxl_port(root->dev.parent);
- if (!is_cxl_root(root)) {
- dev_err(dev, "Failed to acquire root port for HDM enable\n");
- return -ENODEV;
- }
-
- for (i = 0, allowed = 0; info->mem_enabled && i < info->ranges; i++) {
- struct device *cxld_dev;
-
- cxld_dev = device_find_child(&root->dev, &info->dvsec_range[i],
- dvsec_range_allowed);
- if (!cxld_dev) {
- dev_dbg(dev, "DVSEC Range%d denied by platform\n", i);
- continue;
- }
- dev_dbg(dev, "DVSEC Range%d allowed by platform\n", i);
- put_device(cxld_dev);
- allowed++;
- }
-
- if (!allowed && info->mem_enabled) {
- dev_err(dev, "Range register decodes outside platform defined CXL ranges.\n");
- return -ENXIO;
- }
-
- /*
- * Per CXL 2.0 Section 8.1.3.8.3 and 8.1.3.8.4 DVSEC CXL Range 1 Base
- * [High,Low] when HDM operation is enabled the range register values
- * are ignored by the device, but the spec also recommends matching the
- * DVSEC Range 1,2 to HDM Decoder Range 0,1. So, non-zero info->ranges
- * are expected even though Linux does not require or maintain that
- * match. If at least one DVSEC range is enabled and allowed, skip HDM
- * Decoder Capability Enable.
- */
- if (info->mem_enabled)
- return 0;
-
- rc = devm_cxl_enable_hdm(&port->dev, cxlhdm);
- if (rc)
- return rc;
-
- return devm_cxl_enable_mem(&port->dev, cxlds);
-}
-EXPORT_SYMBOL_NS_GPL(cxl_hdm_decode_init, CXL);
-
#define CXL_DOE_TABLE_ACCESS_REQ_CODE 0x000000ff
#define CXL_DOE_TABLE_ACCESS_REQ_CODE_READ 0
#define CXL_DOE_TABLE_ACCESS_TABLE_TYPE 0x0000ff00
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h
index 19aba81cdf13..61d9f4e00921 100644
--- a/drivers/cxl/cxlmem.h
+++ b/drivers/cxl/cxlmem.h
@@ -862,4 +862,7 @@ struct cxl_hdm {
struct seq_file;
struct dentry *cxl_debugfs_create_dir(const char *dir);
void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds);
+int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
+ struct cxl_endpoint_dvsec_info *info);
+
#endif /* __CXL_MEM_H__ */
diff --git a/drivers/cxl/cxlpci.h b/drivers/cxl/cxlpci.h
index 4da07727ab9c..fe01793af1cb 100644
--- a/drivers/cxl/cxlpci.h
+++ b/drivers/cxl/cxlpci.h
@@ -122,9 +122,6 @@ static inline bool cxl_pci_flit_256(struct pci_dev *pdev)
}
int devm_cxl_port_enumerate_dports(struct cxl_port *port);
-struct cxl_dev_state;
-int cxl_hdm_decode_init(struct cxl_dev_state *cxlds, struct cxl_hdm *cxlhdm,
- struct cxl_endpoint_dvsec_info *info);
void read_cdat_data(struct cxl_port *port);
void cxl_cor_error_detected(struct pci_dev *pdev);
pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
--
2.39.2
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