On 10/23/2024 01:32, Shyam Sundar S K wrote:
Use platform_get_resource() to fetch the memory resource instead of
acpi_walk_resources() and devm_ioremap_resource() for mapping the
resources.
PS: We cannot use resource_size() here because it adds an extra byte to round
off the size. In the case of PMF ResourceTemplate(), this rounding is
already handled within the _CRS. Using resource_size() would increase the
resource size by 1, causing a mismatch with the length field and leading
to issues. Therefore, simply use end-start of the ACPI resource to obtain
the actual length.
Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@xxxxxxx>
Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@xxxxxxx>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
---
drivers/platform/x86/amd/pmf/Kconfig | 1 +
drivers/platform/x86/amd/pmf/acpi.c | 46 +++++++++++----------------
drivers/platform/x86/amd/pmf/pmf.h | 6 ++--
drivers/platform/x86/amd/pmf/tee-if.c | 8 ++---
4 files changed, 28 insertions(+), 33 deletions(-)
diff --git a/drivers/platform/x86/amd/pmf/Kconfig b/drivers/platform/x86/amd/pmf/Kconfig
index f4fa8bd8bda8..99d67cdbd91e 100644
--- a/drivers/platform/x86/amd/pmf/Kconfig
+++ b/drivers/platform/x86/amd/pmf/Kconfig
@@ -11,6 +11,7 @@ config AMD_PMF
select ACPI_PLATFORM_PROFILE
depends on TEE && AMDTEE
depends on AMD_SFH_HID
+ depends on HAS_IOMEM
help
This driver provides support for the AMD Platform Management Framework.
The goal is to enhance end user experience by making AMD PCs smarter,
diff --git a/drivers/platform/x86/amd/pmf/acpi.c b/drivers/platform/x86/amd/pmf/acpi.c
index d5b496433d69..62f984fe40c6 100644
--- a/drivers/platform/x86/amd/pmf/acpi.c
+++ b/drivers/platform/x86/amd/pmf/acpi.c
@@ -433,37 +433,29 @@ int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
return 0;
}
-static acpi_status apmf_walk_resources(struct acpi_resource *res, void *data)
+int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
{
- struct amd_pmf_dev *dev = data;
+ struct platform_device *pdev = to_platform_device(pmf_dev->dev);
- switch (res->type) {
- case ACPI_RESOURCE_TYPE_ADDRESS64:
- dev->policy_addr = res->data.address64.address.minimum;
- dev->policy_sz = res->data.address64.address.address_length;
- break;
- case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
- dev->policy_addr = res->data.fixed_memory32.address;
- dev->policy_sz = res->data.fixed_memory32.address_length;
- break;
- }
-
- if (!dev->policy_addr || dev->policy_sz > POLICY_BUF_MAX_SZ || dev->policy_sz == 0) {
- pr_err("Incorrect Policy params, possibly a SBIOS bug\n");
- return AE_ERROR;
+ pmf_dev->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!pmf_dev->res) {
+ dev_err(pmf_dev->dev, "Failed to get I/O memory resource\n");
+ return -EINVAL;
}
- return AE_OK;
-}
-
-int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
-{
- acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
- acpi_status status;
-
- status = acpi_walk_resources(ahandle, METHOD_NAME__CRS, apmf_walk_resources, pmf_dev);
- if (ACPI_FAILURE(status)) {
- dev_dbg(pmf_dev->dev, "acpi_walk_resources failed :%d\n", status);
+ pmf_dev->policy_addr = pmf_dev->res->start;
+ /*
+ * We cannot use resource_size() here because it adds an extra byte to round off the size.
+ * In the case of PMF ResourceTemplate(), this rounding is already handled within the _CRS.
+ * Using resource_size() would increase the resource size by 1, causing a mismatch with the
+ * length field and leading to issues. Therefore, simply use end-start of the ACPI resource
+ * to obtain the actual length.
+ */
+ pmf_dev->policy_sz = pmf_dev->res->end - pmf_dev->res->start;
+
+ if (!pmf_dev->policy_addr || pmf_dev->policy_sz > POLICY_BUF_MAX_SZ ||
+ pmf_dev->policy_sz == 0) {
+ dev_err(pmf_dev->dev, "Incorrect policy params, possibly a SBIOS bug\n");
This upgrades the previous message from debug to error.
TL;DR I feel this error should stay as dev_dbg() if no function checks
are present for Smart PC.
I don't think it's necessarily an error though.
Smart PC checks are a bit different than the other checks. There isn't
a check for a bit being set to indicate the function is supported.
So if the BIOS has the declaration for the region but it's not populated
it might not have a Smart PC policy and this shouldn't be reported as a
BIOS bug.
return -EINVAL;
}
diff --git a/drivers/platform/x86/amd/pmf/pmf.h b/drivers/platform/x86/amd/pmf/pmf.h
index 8ce8816da9c1..a79808fda1d8 100644
--- a/drivers/platform/x86/amd/pmf/pmf.h
+++ b/drivers/platform/x86/amd/pmf/pmf.h
@@ -13,6 +13,7 @@
#include <linux/acpi.h>
#include <linux/input.h>
+#include <linux/platform_device.h>
#include <linux/platform_profile.h>
#define POLICY_BUF_MAX_SZ 0x4b000
@@ -355,19 +356,20 @@ struct amd_pmf_dev {
/* Smart PC solution builder */
struct dentry *esbin;
unsigned char *policy_buf;
- u32 policy_sz;
+ resource_size_t policy_sz;
struct tee_context *tee_ctx;
struct tee_shm *fw_shm_pool;
u32 session_id;
void *shbuf;
struct delayed_work pb_work;
struct pmf_action_table *prev_data;
- u64 policy_addr;
+ resource_size_t policy_addr;
void __iomem *policy_base;
bool smart_pc_enabled;
u16 pmf_if_version;
struct input_dev *pmf_idev;
size_t mtable_size;
+ struct resource *res;
};
struct apmf_sps_prop_granular_v2 {
diff --git a/drivers/platform/x86/amd/pmf/tee-if.c b/drivers/platform/x86/amd/pmf/tee-if.c
index 19c27b6e4666..555b8d6314e0 100644
--- a/drivers/platform/x86/amd/pmf/tee-if.c
+++ b/drivers/platform/x86/amd/pmf/tee-if.c
@@ -257,7 +257,7 @@ static int amd_pmf_invoke_cmd_init(struct amd_pmf_dev *dev)
return -ENODEV;
}
- dev_dbg(dev->dev, "Policy Binary size: %u bytes\n", dev->policy_sz);
+ dev_dbg(dev->dev, "Policy Binary size: %llu bytes\n", dev->policy_sz);
memset(dev->shbuf, 0, dev->policy_sz);
ta_sm = dev->shbuf;
in = &ta_sm->pmf_input.init_table;
@@ -512,9 +512,9 @@ int amd_pmf_init_smart_pc(struct amd_pmf_dev *dev)
if (ret)
goto error;
- dev->policy_base = devm_ioremap(dev->dev, dev->policy_addr, dev->policy_sz);
- if (!dev->policy_base) {
- ret = -ENOMEM;
+ dev->policy_base = devm_ioremap_resource(dev->dev, dev->res);
+ if (IS_ERR(dev->policy_base)) {
+ ret = PTR_ERR(dev->policy_base);
goto error;
}
