mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

Revert "ACPI: CPPC: Use access_width over bit_width for system memory accesses" 

This reverts commit 4949affd52 which is
commit 2f4a4d63a1 upstream.

It breaks AmpereOne systems and should not have been added to the stable
tree just yet.

Link: https://lore.kernel.org/r/97d25ef7-dee9-4cc5-842a-273f565869b3@linux.microsoft.com
Reported-by: Easwar Hariharan <eahariha@linux.microsoft.com>
Cc: Jarred White <jarredwhite@linux.microsoft.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2024-04-12 10:23:42 +02:00
parent 1793e6b2da
commit b54c463294
1 changed files with 3 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
drivers/acpi/cppc_acpi.c
View File

@ -161,13 +161,6 @@ 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)
{
@ -769,10 +762,8 @@ 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;
access_width = GET_BIT_WIDTH(gas_t) / 8;
addr = ioremap(gas_t->address, access_width);
addr = ioremap(gas_t->address, gas_t->bit_width/8);
if (!addr)
goto out_free;
cpc_ptr->cpc_regs[i-2].sys_mem_vaddr = addr;
@ -945,7 +936,6 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
{
int ret_val = 0;
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;
@ -965,9 +955,7 @@ 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);
size = GET_BIT_WIDTH(reg);
switch (size) {
switch (reg->bit_width) {
case 8:
*val = readb_relaxed(vaddr);
break;
@ -986,16 +974,12 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val)
ret_val = -EFAULT;
}
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
*val = MASK_VAL(reg, *val);
return ret_val;
}
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;
@ -1010,12 +994,7 @@ 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);
size = GET_BIT_WIDTH(reg);
if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY)
val = MASK_VAL(reg, val);
switch (size) {
switch (reg->bit_width) {
case 8:
writeb_relaxed(val, vaddr);
break;