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path: root/drivers/misc/ocxl/config.c
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Diffstat (limited to 'drivers/misc/ocxl/config.c')
-rw-r--r--drivers/misc/ocxl/config.c91
1 files changed, 81 insertions, 10 deletions
diff --git a/drivers/misc/ocxl/config.c b/drivers/misc/ocxl/config.c
index e3b99a39d207..4d490b92d951 100644
--- a/drivers/misc/ocxl/config.c
+++ b/drivers/misc/ocxl/config.c
@@ -71,6 +71,20 @@ static int find_dvsec_afu_ctrl(struct pci_dev *dev, u8 afu_idx)
return 0;
}
+/**
+ * get_function_0() - Find a related PCI device (function 0)
+ * @device: PCI device to match
+ *
+ * Returns a pointer to the related device, or null if not found
+ */
+static struct pci_dev *get_function_0(struct pci_dev *dev)
+{
+ unsigned int devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
+
+ return pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
+ dev->bus->number, devfn);
+}
+
static void read_pasid(struct pci_dev *dev, struct ocxl_fn_config *fn)
{
u16 val;
@@ -159,14 +173,15 @@ static int read_dvsec_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn)
static int read_dvsec_vendor(struct pci_dev *dev)
{
int pos;
- u32 cfg, tlx, dlx;
+ u32 cfg, tlx, dlx, reset_reload;
/*
- * vendor specific DVSEC is optional
+ * vendor specific DVSEC, for IBM images only. Some older
+ * images may not have it
*
- * It's currently only used on function 0 to specify the
- * version of some logic blocks. Some older images may not
- * even have it so we ignore any errors
+ * It's only used on function 0 to specify the version of some
+ * logic blocks and to give access to special registers to
+ * enable host-based flashing.
*/
if (PCI_FUNC(dev->devfn) != 0)
return 0;
@@ -178,11 +193,67 @@ static int read_dvsec_vendor(struct pci_dev *dev)
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_CFG_VERS, &cfg);
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_TLX_VERS, &tlx);
pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_DLX_VERS, &dlx);
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ &reset_reload);
dev_dbg(&dev->dev, "Vendor specific DVSEC:\n");
dev_dbg(&dev->dev, " CFG version = 0x%x\n", cfg);
dev_dbg(&dev->dev, " TLX version = 0x%x\n", tlx);
dev_dbg(&dev->dev, " DLX version = 0x%x\n", dlx);
+ dev_dbg(&dev->dev, " ResetReload = 0x%x\n", reset_reload);
+ return 0;
+}
+
+static int get_dvsec_vendor0(struct pci_dev *dev, struct pci_dev **dev0,
+ int *out_pos)
+{
+ int pos;
+
+ if (PCI_FUNC(dev->devfn) != 0) {
+ dev = get_function_0(dev);
+ if (!dev)
+ return -1;
+ }
+ pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID);
+ if (!pos)
+ return -1;
+ *dev0 = dev;
+ *out_pos = pos;
+ return 0;
+}
+
+int ocxl_config_get_reset_reload(struct pci_dev *dev, int *val)
+{
+ struct pci_dev *dev0;
+ u32 reset_reload;
+ int pos;
+
+ if (get_dvsec_vendor0(dev, &dev0, &pos))
+ return -1;
+
+ pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ &reset_reload);
+ *val = !!(reset_reload & BIT(0));
+ return 0;
+}
+
+int ocxl_config_set_reset_reload(struct pci_dev *dev, int val)
+{
+ struct pci_dev *dev0;
+ u32 reset_reload;
+ int pos;
+
+ if (get_dvsec_vendor0(dev, &dev0, &pos))
+ return -1;
+
+ pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ &reset_reload);
+ if (val)
+ reset_reload |= BIT(0);
+ else
+ reset_reload &= ~BIT(0);
+ pci_write_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ reset_reload);
return 0;
}
@@ -273,7 +344,7 @@ static int read_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn,
}
/**
- * read_template_version - Read the template version from the AFU
+ * read_template_version() - Read the template version from the AFU
* @dev: the device for the AFU
* @fn: the AFU offsets
* @len: outputs the template length
@@ -282,7 +353,7 @@ static int read_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn,
* Returns 0 on success, negative on failure
*/
static int read_template_version(struct pci_dev *dev, struct ocxl_fn_config *fn,
- u16 *len, u16 *version)
+ u16 *len, u16 *version)
{
u32 val32;
u8 major, minor;
@@ -476,7 +547,7 @@ static int validate_afu(struct pci_dev *dev, struct ocxl_afu_config *afu)
}
/**
- * read_afu_lpc_memory_info - Populate AFU metadata regarding LPC memory
+ * read_afu_lpc_memory_info() - Populate AFU metadata regarding LPC memory
* @dev: the device for the AFU
* @fn: the AFU offsets
* @afu: the AFU struct to populate the LPC metadata into
@@ -484,8 +555,8 @@ static int validate_afu(struct pci_dev *dev, struct ocxl_afu_config *afu)
* Returns 0 on success, negative on failure
*/
static int read_afu_lpc_memory_info(struct pci_dev *dev,
- struct ocxl_fn_config *fn,
- struct ocxl_afu_config *afu)
+ struct ocxl_fn_config *fn,
+ struct ocxl_afu_config *afu)
{
int rc;
u32 val32;