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Message-Id: <20220815172613.621627-5-kent.overstreet@linux.dev>
Date: Mon, 15 Aug 2022 13:26:06 -0400
From: Kent Overstreet <kent.overstreet@...ux.dev>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org,
Kent Overstreet <kent.overstreet@...il.com>,
linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH 04/11] powerpc: Convert to printbuf
From: Kent Overstreet <kent.overstreet@...il.com>
This converts from seq_buf to printbuf. We're using printbuf in external
buffer mode, so it's a direct conversion, aside from some trivial
refactoring in cpu_show_meltdown() to make the code more consistent.
Signed-off-by: Kent Overstreet <kent.overstreet@...il.com>
Cc: linuxppc-dev@...ts.ozlabs.org
---
arch/powerpc/kernel/process.c | 16 +++--
arch/powerpc/kernel/security.c | 75 ++++++++++-------------
arch/powerpc/platforms/pseries/papr_scm.c | 34 +++++-----
3 files changed, 57 insertions(+), 68 deletions(-)
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 0fbda89cd1..05654dbeb2 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -37,7 +37,7 @@
#include <linux/hw_breakpoint.h>
#include <linux/uaccess.h>
#include <linux/pkeys.h>
-#include <linux/seq_buf.h>
+#include <linux/printbuf.h>
#include <asm/interrupt.h>
#include <asm/io.h>
@@ -1396,32 +1396,30 @@ void show_user_instructions(struct pt_regs *regs)
{
unsigned long pc;
int n = NR_INSN_TO_PRINT;
- struct seq_buf s;
char buf[96]; /* enough for 8 times 9 + 2 chars */
+ struct printbuf s = PRINTBUF_EXTERN(buf, sizeof(buf));
pc = regs->nip - (NR_INSN_TO_PRINT * 3 / 4 * sizeof(int));
- seq_buf_init(&s, buf, sizeof(buf));
-
while (n) {
int i;
- seq_buf_clear(&s);
+ printbuf_reset(&s);
for (i = 0; i < 8 && n; i++, n--, pc += sizeof(int)) {
int instr;
if (copy_from_user_nofault(&instr, (void __user *)pc,
sizeof(instr))) {
- seq_buf_printf(&s, "XXXXXXXX ");
+ prt_printf(&s, "XXXXXXXX ");
continue;
}
- seq_buf_printf(&s, regs->nip == pc ? "<%08x> " : "%08x ", instr);
+ prt_printf(&s, regs->nip == pc ? "<%08x> " : "%08x ", instr);
}
- if (!seq_buf_has_overflowed(&s))
+ if (printbuf_remaining(&s))
pr_info("%s[%d]: code: %s\n", current->comm,
- current->pid, s.buffer);
+ current->pid, s.buf);
}
}
diff --git a/arch/powerpc/kernel/security.c b/arch/powerpc/kernel/security.c
index d96fd14bd7..b34de62e65 100644
--- a/arch/powerpc/kernel/security.c
+++ b/arch/powerpc/kernel/security.c
@@ -10,7 +10,7 @@
#include <linux/memblock.h>
#include <linux/nospec.h>
#include <linux/prctl.h>
-#include <linux/seq_buf.h>
+#include <linux/printbuf.h>
#include <linux/debugfs.h>
#include <asm/asm-prototypes.h>
@@ -144,31 +144,28 @@ void __init setup_spectre_v2(void)
#ifdef CONFIG_PPC_BOOK3S_64
ssize_t cpu_show_meltdown(struct device *dev, struct device_attribute *attr, char *buf)
{
+ struct printbuf s = PRINTBUF_EXTERN(buf, PAGE_SIZE);
bool thread_priv;
thread_priv = security_ftr_enabled(SEC_FTR_L1D_THREAD_PRIV);
if (rfi_flush) {
- struct seq_buf s;
- seq_buf_init(&s, buf, PAGE_SIZE - 1);
- seq_buf_printf(&s, "Mitigation: RFI Flush");
+ prt_printf(&s, "Mitigation: RFI Flush");
if (thread_priv)
- seq_buf_printf(&s, ", L1D private per thread");
-
- seq_buf_printf(&s, "\n");
-
- return s.len;
+ prt_printf(&s, ", L1D private per thread");
+
+ prt_printf(&s, "\n");
+ } else if (thread_priv) {
+ prt_printf(&s, "Vulnerable: L1D private per thread\n");
+ } else if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&
+ !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)) {
+ prt_printf(&s, "Not affected\n");
+ } else {
+ prt_printf(&s, "Vulnerable\n");
}
- if (thread_priv)
- return sprintf(buf, "Vulnerable: L1D private per thread\n");
-
- if (!security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV) &&
- !security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR))
- return sprintf(buf, "Not affected\n");
-
- return sprintf(buf, "Vulnerable\n");
+ return printbuf_written(&s);
}
ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *buf)
@@ -179,70 +176,66 @@ ssize_t cpu_show_l1tf(struct device *dev, struct device_attribute *attr, char *b
ssize_t cpu_show_spectre_v1(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct seq_buf s;
-
- seq_buf_init(&s, buf, PAGE_SIZE - 1);
+ struct printbuf s = PRINTBUF_EXTERN(buf, PAGE_SIZE);
if (security_ftr_enabled(SEC_FTR_BNDS_CHK_SPEC_BAR)) {
if (barrier_nospec_enabled)
- seq_buf_printf(&s, "Mitigation: __user pointer sanitization");
+ prt_printf(&s, "Mitigation: __user pointer sanitization");
else
- seq_buf_printf(&s, "Vulnerable");
+ prt_printf(&s, "Vulnerable");
if (security_ftr_enabled(SEC_FTR_SPEC_BAR_ORI31))
- seq_buf_printf(&s, ", ori31 speculation barrier enabled");
+ prt_printf(&s, ", ori31 speculation barrier enabled");
- seq_buf_printf(&s, "\n");
+ prt_printf(&s, "\n");
} else
- seq_buf_printf(&s, "Not affected\n");
+ prt_printf(&s, "Not affected\n");
- return s.len;
+ return printbuf_written(&s);
}
ssize_t cpu_show_spectre_v2(struct device *dev, struct device_attribute *attr, char *buf)
{
- struct seq_buf s;
+ struct printbuf s = PRINTBUF_EXTERN(buf, PAGE_SIZE);
bool bcs, ccd;
- seq_buf_init(&s, buf, PAGE_SIZE - 1);
-
bcs = security_ftr_enabled(SEC_FTR_BCCTRL_SERIALISED);
ccd = security_ftr_enabled(SEC_FTR_COUNT_CACHE_DISABLED);
if (bcs || ccd) {
- seq_buf_printf(&s, "Mitigation: ");
+ prt_printf(&s, "Mitigation: ");
if (bcs)
- seq_buf_printf(&s, "Indirect branch serialisation (kernel only)");
+ prt_printf(&s, "Indirect branch serialisation (kernel only)");
if (bcs && ccd)
- seq_buf_printf(&s, ", ");
+ prt_printf(&s, ", ");
if (ccd)
- seq_buf_printf(&s, "Indirect branch cache disabled");
+ prt_printf(&s, "Indirect branch cache disabled");
} else if (count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) {
- seq_buf_printf(&s, "Mitigation: Software count cache flush");
+ prt_printf(&s, "Mitigation: Software count cache flush");
if (count_cache_flush_type == BRANCH_CACHE_FLUSH_HW)
- seq_buf_printf(&s, " (hardware accelerated)");
+ prt_printf(&s, " (hardware accelerated)");
} else if (btb_flush_enabled) {
- seq_buf_printf(&s, "Mitigation: Branch predictor state flush");
+ prt_printf(&s, "Mitigation: Branch predictor state flush");
} else {
- seq_buf_printf(&s, "Vulnerable");
+ prt_printf(&s, "Vulnerable");
}
if (bcs || ccd || count_cache_flush_type != BRANCH_CACHE_FLUSH_NONE) {
if (link_stack_flush_type != BRANCH_CACHE_FLUSH_NONE)
- seq_buf_printf(&s, ", Software link stack flush");
+ prt_printf(&s, ", Software link stack flush");
if (link_stack_flush_type == BRANCH_CACHE_FLUSH_HW)
- seq_buf_printf(&s, " (hardware accelerated)");
+ prt_printf(&s, " (hardware accelerated)");
}
- seq_buf_printf(&s, "\n");
+ prt_printf(&s, "\n");
- return s.len;
+ return printbuf_written(&s);
}
#ifdef CONFIG_PPC_BOOK3S_64
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c
index 20f6ed813b..a1fd25243c 100644
--- a/arch/powerpc/platforms/pseries/papr_scm.c
+++ b/arch/powerpc/platforms/pseries/papr_scm.c
@@ -12,7 +12,7 @@
#include <linux/libnvdimm.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
-#include <linux/seq_buf.h>
+#include <linux/printbuf.h>
#include <linux/nd.h>
#include <asm/plpar_wrappers.h>
@@ -1142,7 +1142,7 @@ static ssize_t perf_stats_show(struct device *dev,
{
int index;
ssize_t rc;
- struct seq_buf s;
+ struct printbuf s = PRINTBUF_EXTERN(buf, PAGE_SIZE);
struct papr_scm_perf_stat *stat;
struct papr_scm_perf_stats *stats;
struct nvdimm *dimm = to_nvdimm(dev);
@@ -1165,18 +1165,17 @@ static ssize_t perf_stats_show(struct device *dev,
* values. Since stat_id is essentially a char string of
* 8 bytes, simply use the string format specifier to print it.
*/
- seq_buf_init(&s, buf, PAGE_SIZE);
for (index = 0, stat = stats->scm_statistic;
index < be32_to_cpu(stats->num_statistics);
++index, ++stat) {
- seq_buf_printf(&s, "%.8s = 0x%016llX\n",
- stat->stat_id,
- be64_to_cpu(stat->stat_val));
+ prt_printf(&s, "%.8s = 0x%016llX\n",
+ stat->stat_id,
+ be64_to_cpu(stat->stat_val));
}
free_stats:
kfree(stats);
- return rc ? rc : (ssize_t)seq_buf_used(&s);
+ return rc ?: printbuf_written(&s);
}
static DEVICE_ATTR_ADMIN_RO(perf_stats);
@@ -1185,7 +1184,7 @@ static ssize_t flags_show(struct device *dev,
{
struct nvdimm *dimm = to_nvdimm(dev);
struct papr_scm_priv *p = nvdimm_provider_data(dimm);
- struct seq_buf s;
+ struct printbuf s = PRINTBUF_EXTERN(buf, PAGE_SIZE);
u64 health;
int rc;
@@ -1196,29 +1195,28 @@ static ssize_t flags_show(struct device *dev,
/* Copy health_bitmap locally, check masks & update out buffer */
health = READ_ONCE(p->health_bitmap);
- seq_buf_init(&s, buf, PAGE_SIZE);
if (health & PAPR_PMEM_UNARMED_MASK)
- seq_buf_printf(&s, "not_armed ");
+ prt_printf(&s, "not_armed ");
if (health & PAPR_PMEM_BAD_SHUTDOWN_MASK)
- seq_buf_printf(&s, "flush_fail ");
+ prt_printf(&s, "flush_fail ");
if (health & PAPR_PMEM_BAD_RESTORE_MASK)
- seq_buf_printf(&s, "restore_fail ");
+ prt_printf(&s, "restore_fail ");
if (health & PAPR_PMEM_ENCRYPTED)
- seq_buf_printf(&s, "encrypted ");
+ prt_printf(&s, "encrypted ");
if (health & PAPR_PMEM_SMART_EVENT_MASK)
- seq_buf_printf(&s, "smart_notify ");
+ prt_printf(&s, "smart_notify ");
if (health & PAPR_PMEM_SCRUBBED_AND_LOCKED)
- seq_buf_printf(&s, "scrubbed locked ");
+ prt_printf(&s, "scrubbed locked ");
- if (seq_buf_used(&s))
- seq_buf_printf(&s, "\n");
+ if (printbuf_written(&s))
+ prt_printf(&s, "\n");
- return seq_buf_used(&s);
+ return printbuf_written(&s);
}
DEVICE_ATTR_RO(flags);
--
2.36.1
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