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Message-Id: <20240301192600.2568-1-jarredwhite@linux.microsoft.com>
Date: Fri, 1 Mar 2024 11:25:59 -0800
From: Jarred White <jarredwhite@...ux.microsoft.com>
To: "Rafael J. Wysocki" <rafael@...nel.org>,
Len Brown <lenb@...nel.org>,
linux-acpi@...r.kernel.org (open list:ACPI),
linux-kernel@...r.kernel.org (open list)
Cc: Jarred White <jarredwhite@...ux.microsoft.com>,
srivatsabhat@...ux.microsoft.com,
stable@...r.kernel.org
Subject: [PATCH v3] acpi: Use access_width over bit_width for system memory accesses
To align with ACPI 6.3+, since bit_width can be any 8-bit value, we cannot
depend on it being always on a clean 8b boundary. This was uncovered on the
Cobalt 100 platform.
SError Interrupt on CPU26, code 0xbe000011 -- SError
CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted 5.15.2.1-13 #1
Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION
pstate: 62400009 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : cppc_get_perf_caps+0xec/0x410
lr : cppc_get_perf_caps+0xe8/0x410
sp : ffff8000155ab730
x29: ffff8000155ab730 x28: ffff0080139d0038 x27: ffff0080139d0078
x26: 0000000000000000 x25: ffff0080139d0058 x24: 00000000ffffffff
x23: ffff0080139d0298 x22: ffff0080139d0278 x21: 0000000000000000
x20: ffff00802b251910 x19: ffff0080139d0000 x18: ffffffffffffffff
x17: 0000000000000000 x16: ffffdc7e111bad04 x15: ffff00802b251008
x14: ffffffffffffffff x13: ffff013f1fd63300 x12: 0000000000000006
x11: ffffdc7e128f4420 x10: 0000000000000000 x9 : ffffdc7e111badec
x8 : ffff00802b251980 x7 : 0000000000000000 x6 : ffff0080139d0028
x5 : 0000000000000000 x4 : ffff0080139d0018 x3 : 00000000ffffffff
x2 : 0000000000000008 x1 : ffff8000155ab7a0 x0 : 0000000000000000
Kernel panic - not syncing: Asynchronous SError Interrupt
CPU: 26 PID: 1510 Comm: systemd-udevd Not tainted
5.15.2.1-13 #1
Hardware name: MICROSOFT CORPORATION, BIOS MICROSOFT CORPORATION
Call trace:
dump_backtrace+0x0/0x1e0
show_stack+0x24/0x30
dump_stack_lvl+0x8c/0xb8
dump_stack+0x18/0x34
panic+0x16c/0x384
add_taint+0x0/0xc0
arm64_serror_panic+0x7c/0x90
arm64_is_fatal_ras_serror+0x34/0xa4
do_serror+0x50/0x6c
el1h_64_error_handler+0x40/0x74
el1h_64_error+0x7c/0x80
cppc_get_perf_caps+0xec/0x410
cppc_cpufreq_cpu_init+0x74/0x400 [cppc_cpufreq]
cpufreq_online+0x2dc/0xa30
cpufreq_add_dev+0xc0/0xd4
subsys_interface_register+0x134/0x14c
cpufreq_register_driver+0x1b0/0x354
cppc_cpufreq_init+0x1a8/0x1000 [cppc_cpufreq]
do_one_initcall+0x50/0x250
do_init_module+0x60/0x27c
load_module+0x2300/0x2570
__do_sys_finit_module+0xa8/0x114
__arm64_sys_finit_module+0x2c/0x3c
invoke_syscall+0x78/0x100
el0_svc_common.constprop.0+0x180/0x1a0
do_el0_svc+0x84/0xa0
el0_svc+0x2c/0xc0
el0t_64_sync_handler+0xa4/0x12c
el0t_64_sync+0x1a4/0x1a8
Instead, use access_width to determine the size and use the offset and width
to shift and mask the bits we want to read/write out. Make sure to add a check
for system memory since pcc redefines the access_width to subspace id. If
access_width is not set, then fallback to using the bit_width.
Signed-off-by: Jarred White <jarredwhite@...ux.microsoft.com>
CC: srivatsabhat@...ux.microsoft.com
CC: stable@...r.kernel.org #5.15+
---
changelog:
v1-->v2:
https://lore.kernel.org/linux-acpi/20231216001312.1160-1-jarredwhite@linux.microsoft.com/
1. Fixed coding style errors
2. Backwards compatibility with ioremapping of address still an
open question. Suggestions are welcomed.
v2-->v3:
1. Created a fallback mechanism to revert to using the bit_width
2. Re-labeled macro to GET_BIT_WIDTH
3. Collapsed the if/else statements in the cpc_read() and cpc_write() routines
drivers/acpi/cppc_acpi.c | 32 +++++++++++++++++++++++++++-----
1 file changed, 27 insertions(+), 5 deletions(-)
diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index d155a86a8614..57de7edda7a5 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -166,6 +166,13 @@ show_cppc_data(cppc_get_perf_caps, cppc_perf_caps, nominal_freq);
show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, reference_perf);
show_cppc_data(cppc_get_perf_ctrs, cppc_perf_fb_ctrs, wraparound_time);
+/* Check for valid access_width, otherwise, fallback to using the bit_width */
+#define GET_BIT_WIDTH(reg) ((reg)->access_width ? (8 << ((reg)->access_width - 1)) : (reg)->bit_width)
+
+/* Shift and apply the mask for CPC reads/writes */
+#define MASK_VAL(reg, val) ((val) >> ((reg)->bit_offset & \
+ GENMASK(((reg)->bit_width), 0)))
+
static ssize_t show_feedback_ctrs(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@@ -780,6 +787,7 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
} else if (gas_t->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) {
if (gas_t->address) {
void __iomem *addr;
+ size_t access_width;
if (!osc_cpc_flexible_adr_space_confirmed) {
pr_debug("Flexible address space capability not supported\n");
@@ -787,7 +795,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
goto out_free;
}
- addr = ioremap(gas_t->address, gas_t->bit_width/8);
+ /* Check for access_width for the size, otherwise use bit_width */
+ access_width = GET_BIT_WIDTH(gas_t) / 8;
+ addr = ioremap(gas_t->address, access_width);
if (!addr)
goto out_free;
cpc_ptr->cpc_regs[i-2].sys_mem_vaddr = addr;
@@ -983,6 +993,7 @@ int __weak cpc_write_ffh(int cpunum, struct cpc_reg *reg, u64 val)
static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
{
void __iomem *vaddr = NULL;
+ int size;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_reg *reg = ®_res->cpc_entry.reg;
@@ -994,7 +1005,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
*val = 0;
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
- u32 width = 8 << (reg->access_width - 1);
+ u32 width = GET_BIT_WIDTH(reg);
u32 val_u32;
acpi_status status;
@@ -1018,7 +1029,9 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
return acpi_os_read_memory((acpi_physical_address)reg->address,
val, reg->bit_width);
- switch (reg->bit_width) {
+ size = GET_BIT_WIDTH(reg);
+
+ switch (size) {
case 8:
*val = readb_relaxed(vaddr);
break;
@@ -1037,18 +1050,22 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
return -EFAULT;
}
+ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
+ *val = MASK_VAL(reg, *val);
+
return 0;
}
static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
{
int ret_val = 0;
+ int size;
void __iomem *vaddr = NULL;
int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu);
struct cpc_reg *reg = ®_res->cpc_entry.reg;
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_IO) {
- u32 width = 8 << (reg->access_width - 1);
+ u32 width = GET_BIT_WIDTH(reg);
acpi_status status;
status = acpi_os_write_port((acpi_io_address)reg->address,
@@ -1070,7 +1087,12 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val)
return acpi_os_write_memory((acpi_physical_address)reg->address,
val, reg->bit_width);
- switch (reg->bit_width) {
+ size = GET_BIT_WIDTH(reg);
+
+ if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
+ val = MASK_VAL(reg, val);
+
+ switch (size) {
case 8:
writeb_relaxed(val, vaddr);
break;
--
2.34.1
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