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93 lines
2.6 KiB
93 lines
2.6 KiB
commit 9ea191d15f4b279923a4c83a94b83436c79e3482
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Author: Haren Myneni <haren@linux.ibm.com>
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Date: Tue Aug 13 14:40:23 2024 -0700
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drmgr/pci: Enable in-kernel functionality to update device tree
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drmgr updates the device tree by writing to /proc/ppc64/ofdt. Also
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invokes configure_connector RTAS call to retrieve new device nodes
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for IO ADD. But this functionality need /dev/mem access which is
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restricted under system lockdown.
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The kernel updates provided a sysfs file (/sys/kernel/dlpar) that
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will allow drmgr command invoke the following interfaces to update
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the device tree.
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dt add index <DRC index> ---> To add new device nodes to the device
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tree which is used for IO ADD.
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dt remove index <DRC index> ---> To remove device nodes for IO
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REMOVE
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This patch checks the kernel interface for the availability of
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device tree update feature and adds do_dt_kernel_dlpar() to invoke
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the above kernel interfaces.
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Signed-off-by: Haren Myneni <haren@linux.ibm.com>
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Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
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diff --git a/src/drmgr/common.c b/src/drmgr/common.c
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index bfec0b9..70f4dfd 100644
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--- a/src/drmgr/common.c
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+++ b/src/drmgr/common.c
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@@ -1504,6 +1504,12 @@ int kernel_dlpar_exists(void)
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if (strstr(buf, "cpu"))
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return 1;
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break;
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+ case DRC_TYPE_PCI:
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+ case DRC_TYPE_PHB:
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+ case DRC_TYPE_SLOT:
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+ if (strstr(buf, "dt"))
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+ return 1;
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+ break;
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default:
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return 0;
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}
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diff --git a/src/drmgr/common_pci.c b/src/drmgr/common_pci.c
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index 759589a..109e0d2 100644
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--- a/src/drmgr/common_pci.c
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+++ b/src/drmgr/common_pci.c
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@@ -1619,3 +1619,32 @@ int disable_hp_children(char *drc_name)
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}
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return 0;
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}
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+
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+/*
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+ * kernel interface to update device tree nodes.
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+ * dlpar dt [add|remove] index <#drc index>
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+ */
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+int do_dt_kernel_dlpar(uint32_t index, int action)
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+{
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+ char cmdbuf[256];
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+ int offset;
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+
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+ offset = sprintf(cmdbuf, "%s ", "dt");
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+
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+ switch (action) {
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+ case ADD:
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+ offset += sprintf(cmdbuf + offset, "add ");
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+ break;
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+ case REMOVE:
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+ offset += sprintf(cmdbuf + offset, "remove ");
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+ break;
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+ default:
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+ /* Should not happen */
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+ say(ERROR, "Invalid action type specified\n");
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+ return -EINVAL;
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+ }
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+
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+ offset += sprintf(cmdbuf + offset, "index 0x%x", index);
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+
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+ return do_kernel_dlpar(cmdbuf, offset);
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+}
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diff --git a/src/drmgr/dr.h b/src/drmgr/dr.h
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index 60c31c4..72ede55 100644
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--- a/src/drmgr/dr.h
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+++ b/src/drmgr/dr.h
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@@ -188,4 +188,5 @@ static inline int do_kernel_dlpar(const char *cmd, int len)
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{
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return do_kernel_dlpar_common(cmd, len, 0);
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}
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+int do_dt_kernel_dlpar(uint32_t, int);
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#endif
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