[PATCH] powerpc/pseries: delete scanlog
Nathan Lynch
nathanl at linux.ibm.com
Tue Sep 21 03:32:03 AEST 2021
Remove the pseries scanlog driver.
This code supports functions from Power4-era servers that are not present
on targets currently supported by arch/powerpc. System manuals from this
time have this description:
Scan Dump data is a set of chip data that the service processor gathers
after a system malfunction. It consists of chip scan rings, chip trace
arrays, and Scan COM (SCOM) registers. This data is stored in the
scan-log partition of the system’s Nonvolatile Random Access
Memory (NVRAM).
PowerVM partition firmware development doesn't recognize the associated
function call or property, and they don't see any references to them in
their codebase. It seems to have been specific to non-virtualized pseries.
References:
Historical Linux commit from February 2003 (interesting to note this seems
to be the source of non-GPL exports for rtas_call etc):
https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git/commit/?id=f92e361842d5251e50562b09664082dcbd0548bb
IntelliStation and pSeries docs which refer to the feature:
http://ps-2.retropc.se/basil.holloway/ALL%20PDF/380635.pdf
http://ps-2.kev009.com/rs6000/manuals/p/p615-6C3-6E3/6C3_and_6E3_Users_Guide_SA38-0629.pdf
Signed-off-by: Nathan Lynch <nathanl at linux.ibm.com>
Reviewed-by: Tyrel Datwyler <tyreld at linux.ibm.com>
---
arch/powerpc/configs/ppc64_defconfig | 1 -
arch/powerpc/configs/pseries_defconfig | 1 -
arch/powerpc/platforms/pseries/Kconfig | 4 -
arch/powerpc/platforms/pseries/Makefile | 1 -
arch/powerpc/platforms/pseries/scanlog.c | 195 -----------------------
5 files changed, 202 deletions(-)
delete mode 100644 arch/powerpc/platforms/pseries/scanlog.c
diff --git a/arch/powerpc/configs/ppc64_defconfig b/arch/powerpc/configs/ppc64_defconfig
index 0ad2291337a7..846815007fef 100644
--- a/arch/powerpc/configs/ppc64_defconfig
+++ b/arch/powerpc/configs/ppc64_defconfig
@@ -26,7 +26,6 @@ CONFIG_PPC64=y
CONFIG_NR_CPUS=2048
CONFIG_PPC_SPLPAR=y
CONFIG_DTL=y
-CONFIG_SCANLOG=m
CONFIG_PPC_SMLPAR=y
CONFIG_IBMEBUS=y
CONFIG_PPC_SVM=y
diff --git a/arch/powerpc/configs/pseries_defconfig b/arch/powerpc/configs/pseries_defconfig
index b183629f1bcf..42a72e6d5b35 100644
--- a/arch/powerpc/configs/pseries_defconfig
+++ b/arch/powerpc/configs/pseries_defconfig
@@ -38,7 +38,6 @@ CONFIG_MODULE_SRCVERSION_ALL=y
CONFIG_PARTITION_ADVANCED=y
CONFIG_PPC_SPLPAR=y
CONFIG_DTL=y
-CONFIG_SCANLOG=m
CONFIG_PPC_SMLPAR=y
CONFIG_IBMEBUS=y
CONFIG_PAPR_SCM=m
diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig
index 5e037df2a3a1..bf9b612a929b 100644
--- a/arch/powerpc/platforms/pseries/Kconfig
+++ b/arch/powerpc/platforms/pseries/Kconfig
@@ -61,10 +61,6 @@ config PSERIES_ENERGY
Provides: /sys/devices/system/cpu/pseries_(de)activation_hint_list
and /sys/devices/system/cpu/cpuN/pseries_(de)activation_hint
-config SCANLOG
- tristate "Scanlog dump interface"
- depends on RTAS_PROC && PPC_PSERIES
-
config IO_EVENT_IRQ
bool "IO Event Interrupt support"
depends on PPC_PSERIES
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 4cda0ef87be0..2f9ae0c113e3 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -8,7 +8,6 @@ obj-y := lpar.o hvCall.o nvram.o reconfig.o \
firmware.o power.o dlpar.o mobility.o rng.o \
pci.o pci_dlpar.o eeh_pseries.o msi.o
obj-$(CONFIG_SMP) += smp.o
-obj-$(CONFIG_SCANLOG) += scanlog.o
obj-$(CONFIG_KEXEC_CORE) += kexec.o
obj-$(CONFIG_PSERIES_ENERGY) += pseries_energy.o
diff --git a/arch/powerpc/platforms/pseries/scanlog.c b/arch/powerpc/platforms/pseries/scanlog.c
deleted file mode 100644
index 2879c4f0ceb7..000000000000
--- a/arch/powerpc/platforms/pseries/scanlog.c
+++ /dev/null
@@ -1,195 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * c 2001 PPC 64 Team, IBM Corp
- *
- * scan-log-data driver for PPC64 Todd Inglett <tinglett at vnet.ibm.com>
- *
- * When ppc64 hardware fails the service processor dumps internal state
- * of the system. After a reboot the operating system can access a dump
- * of this data using this driver. A dump exists if the device-tree
- * /chosen/ibm,scan-log-data property exists.
- *
- * This driver exports /proc/powerpc/scan-log-dump which can be read.
- * The driver supports only sequential reads.
- *
- * The driver looks at a write to the driver for the single word "reset".
- * If given, the driver will reset the scanlog so the platform can free it.
- */
-
-#include <linux/module.h>
-#include <linux/types.h>
-#include <linux/errno.h>
-#include <linux/proc_fs.h>
-#include <linux/init.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/uaccess.h>
-#include <asm/rtas.h>
-#include <asm/prom.h>
-
-#define MODULE_VERS "1.0"
-#define MODULE_NAME "scanlog"
-
-/* Status returns from ibm,scan-log-dump */
-#define SCANLOG_COMPLETE 0
-#define SCANLOG_HWERROR -1
-#define SCANLOG_CONTINUE 1
-
-
-static unsigned int ibm_scan_log_dump; /* RTAS token */
-static unsigned int *scanlog_buffer; /* The data buffer */
-
-static ssize_t scanlog_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- unsigned int *data = scanlog_buffer;
- int status;
- unsigned long len, off;
- unsigned int wait_time;
-
- if (count > RTAS_DATA_BUF_SIZE)
- count = RTAS_DATA_BUF_SIZE;
-
- if (count < 1024) {
- /* This is the min supported by this RTAS call. Rather
- * than do all the buffering we insist the user code handle
- * larger reads. As long as cp works... :)
- */
- printk(KERN_ERR "scanlog: cannot perform a small read (%ld)\n", count);
- return -EINVAL;
- }
-
- if (!access_ok(buf, count))
- return -EFAULT;
-
- for (;;) {
- wait_time = 500; /* default wait if no data */
- spin_lock(&rtas_data_buf_lock);
- memcpy(rtas_data_buf, data, RTAS_DATA_BUF_SIZE);
- status = rtas_call(ibm_scan_log_dump, 2, 1, NULL,
- (u32) __pa(rtas_data_buf), (u32) count);
- memcpy(data, rtas_data_buf, RTAS_DATA_BUF_SIZE);
- spin_unlock(&rtas_data_buf_lock);
-
- pr_debug("scanlog: status=%d, data[0]=%x, data[1]=%x, " \
- "data[2]=%x\n", status, data[0], data[1], data[2]);
- switch (status) {
- case SCANLOG_COMPLETE:
- pr_debug("scanlog: hit eof\n");
- return 0;
- case SCANLOG_HWERROR:
- pr_debug("scanlog: hardware error reading data\n");
- return -EIO;
- case SCANLOG_CONTINUE:
- /* We may or may not have data yet */
- len = data[1];
- off = data[2];
- if (len > 0) {
- if (copy_to_user(buf, ((char *)data)+off, len))
- return -EFAULT;
- return len;
- }
- /* Break to sleep default time */
- break;
- default:
- /* Assume extended busy */
- wait_time = rtas_busy_delay_time(status);
- if (!wait_time) {
- printk(KERN_ERR "scanlog: unknown error " \
- "from rtas: %d\n", status);
- return -EIO;
- }
- }
- /* Apparently no data yet. Wait and try again. */
- msleep_interruptible(wait_time);
- }
- /*NOTREACHED*/
-}
-
-static ssize_t scanlog_write(struct file * file, const char __user * buf,
- size_t count, loff_t *ppos)
-{
- char stkbuf[20];
- int status;
-
- if (count > 19) count = 19;
- if (copy_from_user (stkbuf, buf, count)) {
- return -EFAULT;
- }
- stkbuf[count] = 0;
-
- if (buf) {
- if (strncmp(stkbuf, "reset", 5) == 0) {
- pr_debug("scanlog: reset scanlog\n");
- status = rtas_call(ibm_scan_log_dump, 2, 1, NULL, 0, 0);
- pr_debug("scanlog: rtas returns %d\n", status);
- }
- }
- return count;
-}
-
-static int scanlog_open(struct inode * inode, struct file * file)
-{
- unsigned int *data = scanlog_buffer;
-
- if (data[0] != 0) {
- /* This imperfect test stops a second copy of the
- * data (or a reset while data is being copied)
- */
- return -EBUSY;
- }
-
- data[0] = 0; /* re-init so we restart the scan */
-
- return 0;
-}
-
-static int scanlog_release(struct inode * inode, struct file * file)
-{
- unsigned int *data = scanlog_buffer;
-
- data[0] = 0;
- return 0;
-}
-
-static const struct proc_ops scanlog_proc_ops = {
- .proc_read = scanlog_read,
- .proc_write = scanlog_write,
- .proc_open = scanlog_open,
- .proc_release = scanlog_release,
- .proc_lseek = noop_llseek,
-};
-
-static int __init scanlog_init(void)
-{
- struct proc_dir_entry *ent;
- int err = -ENOMEM;
-
- ibm_scan_log_dump = rtas_token("ibm,scan-log-dump");
- if (ibm_scan_log_dump == RTAS_UNKNOWN_SERVICE)
- return -ENODEV;
-
- /* Ideally we could allocate a buffer < 4G */
- scanlog_buffer = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
- if (!scanlog_buffer)
- goto err;
-
- ent = proc_create("powerpc/rtas/scan-log-dump", 0400, NULL,
- &scanlog_proc_ops);
- if (!ent)
- goto err;
- return 0;
-err:
- kfree(scanlog_buffer);
- return err;
-}
-
-static void __exit scanlog_cleanup(void)
-{
- remove_proc_entry("powerpc/rtas/scan-log-dump", NULL);
- kfree(scanlog_buffer);
-}
-
-module_init(scanlog_init);
-module_exit(scanlog_cleanup);
-MODULE_LICENSE("GPL");
--
2.31.1
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