[PATCH 6.6 095/396] ACPI: CPPC: Use access_width over bit_width for system memory accesses

Greg Kroah-Hartman
2024-04-01T16:39:51Z

From: Jarred White <jarredwhite@linux.microsoft.com>

[ Upstream commit 2f4a4d63a193be6fd530d180bb13c3592052904c ]

To align with ACPI 6.3+, since bit_width can be any 8-bit value, it
cannot be depended on to be 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 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 fall back to using bit_width.

Signed-off-by: Jarred White <jarredwhite@linux.microsoft.com>
Reviewed-by: Easwar Hariharan <eahariha@linux.microsoft.com>
Cc: 5.15+ <stable@vger.kernel.org> # 5.15+
[ rjw: Subject and changelog edits, comment adjustments ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/acpi/cppc_acpi.c | 31 ++++++++++++++++++++++++++-----
1 file changed, 26 insertions(+), 5 deletions(-)

diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c
index 7ff269a78c208..bcc5d8f5bb5ee 100644
--- a/drivers/acpi/cppc_acpi.c
+++ b/drivers/acpi/cppc_acpi.c
@@ -163,6 +163,13 @@ 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 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)
{
@@ -777,6 +784,7 @@ 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");
@@ -784,7 +792,8 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr)
goto out_free;
}

- addr = ioremap(gas_t->address, gas_t->bit_width/8);
+ 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;
@@ -980,6 +989,7 @@ 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 = &reg_res->cpc_entry.reg;

@@ -991,7 +1001,7 @@ 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;

@@ -1015,7 +1025,9 @@ 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;
@@ -1034,18 +1046,22 @@ 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 = &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,
@@ -1067,7 +1083,12 @@ 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;
--
2.43.0