From: Shyam Sundar S K Shyam-sundar.S-k@amd.com
[ Upstream commit aec8298c093f052fc8a86f9411b69b23953b0edb ]
The current SMN index used for the driver probe seems to be meant for the BIOS pair and there are potential concurrency problems that can occur with an inopportune SMI.
It is been advised to use SMN_INDEX_0 instead of SMN_INDEX_2, which is what amd_nb.c provides and this function has protections to ensure that only one caller can use it at a time.
Fixes: da5ce22df5fe ("platform/x86/amd/pmf: Add support for PMF core layer") Co-developed-by: Patil Rajesh Reddy Patil.Reddy@amd.com Signed-off-by: Patil Rajesh Reddy Patil.Reddy@amd.com Signed-off-by: Shyam Sundar S K Shyam-sundar.S-k@amd.com Link: https://lore.kernel.org/r/20230406164807.50969-4-Shyam-sundar.S-k@amd.com Reviewed-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/amd/pmf/Kconfig | 1 + drivers/platform/x86/amd/pmf/core.c | 22 +++++----------------- 2 files changed, 6 insertions(+), 17 deletions(-)
diff --git a/drivers/platform/x86/amd/pmf/Kconfig b/drivers/platform/x86/amd/pmf/Kconfig index 6d89528c31779..d87986adf91e1 100644 --- a/drivers/platform/x86/amd/pmf/Kconfig +++ b/drivers/platform/x86/amd/pmf/Kconfig @@ -7,6 +7,7 @@ config AMD_PMF tristate "AMD Platform Management Framework" depends on ACPI && PCI depends on POWER_SUPPLY + depends on AMD_NB select ACPI_PLATFORM_PROFILE help This driver provides support for the AMD Platform Management Framework. diff --git a/drivers/platform/x86/amd/pmf/core.c b/drivers/platform/x86/amd/pmf/core.c index da23639071d79..0acc0b6221290 100644 --- a/drivers/platform/x86/amd/pmf/core.c +++ b/drivers/platform/x86/amd/pmf/core.c @@ -8,6 +8,7 @@ * Author: Shyam Sundar S K Shyam-sundar.S-k@amd.com */
+#include <asm/amd_nb.h> #include <linux/debugfs.h> #include <linux/iopoll.h> #include <linux/module.h> @@ -22,8 +23,6 @@ #define AMD_PMF_REGISTER_ARGUMENT 0xA58
/* Base address of SMU for mapping physical address to virtual address */ -#define AMD_PMF_SMU_INDEX_ADDRESS 0xB8 -#define AMD_PMF_SMU_INDEX_DATA 0xBC #define AMD_PMF_MAPPING_SIZE 0x01000 #define AMD_PMF_BASE_ADDR_OFFSET 0x10000 #define AMD_PMF_BASE_ADDR_LO 0x13B102E8 @@ -348,30 +347,19 @@ static int amd_pmf_probe(struct platform_device *pdev) }
dev->cpu_id = rdev->device; - err = pci_write_config_dword(rdev, AMD_PMF_SMU_INDEX_ADDRESS, AMD_PMF_BASE_ADDR_LO); - if (err) { - dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMF_SMU_INDEX_ADDRESS); - pci_dev_put(rdev); - return pcibios_err_to_errno(err); - }
- err = pci_read_config_dword(rdev, AMD_PMF_SMU_INDEX_DATA, &val); + err = amd_smn_read(0, AMD_PMF_BASE_ADDR_LO, &val); if (err) { + dev_err(dev->dev, "error in reading from 0x%x\n", AMD_PMF_BASE_ADDR_LO); pci_dev_put(rdev); return pcibios_err_to_errno(err); }
base_addr_lo = val & AMD_PMF_BASE_ADDR_HI_MASK;
- err = pci_write_config_dword(rdev, AMD_PMF_SMU_INDEX_ADDRESS, AMD_PMF_BASE_ADDR_HI); - if (err) { - dev_err(dev->dev, "error writing to 0x%x\n", AMD_PMF_SMU_INDEX_ADDRESS); - pci_dev_put(rdev); - return pcibios_err_to_errno(err); - } - - err = pci_read_config_dword(rdev, AMD_PMF_SMU_INDEX_DATA, &val); + err = amd_smn_read(0, AMD_PMF_BASE_ADDR_HI, &val); if (err) { + dev_err(dev->dev, "error in reading from 0x%x\n", AMD_PMF_BASE_ADDR_HI); pci_dev_put(rdev); return pcibios_err_to_errno(err); }