From: Corey Hickey <bugfood-c@xxxxxxxxxx>
Loading the amd_pmc module as:
amd_pmc enable_stb=1
...can result in the following messages in the kernel ring buffer:
amd_pmc AMDI0009:00: SMU cmd failed. err: 0xff
ioremap on RAM at 0x0000000000000000 - 0x0000000000ffffff
WARNING: CPU: 10 PID: 2151 at arch/x86/mm/ioremap.c:217 __ioremap_caller+0x2cd/0x340
Further debugging reveals that this occurs when the requests for
S2D_PHYS_ADDR_LOW and S2D_PHYS_ADDR_HIGH return a value of 0,
indicating that the STB is inaccessible. To prevent the ioremap
warning and provide clarity to the user, handle the invalid address
and display an error message.
Link: https://lore.kernel.org/platform-driver-x86/c588ff5d-3e04-4549-9a86-284b9b4419ba@xxxxxxx
Fixes: 3d7d407dfb05 ("platform/x86: amd-pmc: Add support for AMD Spill to DRAM STB feature")
Acked-by: Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>
Signed-off-by: Corey Hickey <bugfood-c@xxxxxxxxxx>
---
drivers/platform/x86/amd/pmc/pmc.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/platform/x86/amd/pmc/pmc.c b/drivers/platform/x86/amd/pmc/pmc.c
index bbb8edb62e00..5669f94c3d06 100644
--- a/drivers/platform/x86/amd/pmc/pmc.c
+++ b/drivers/platform/x86/amd/pmc/pmc.c
@@ -998,6 +998,11 @@ static int amd_pmc_s2d_init(struct amd_pmc_dev *dev)
amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_LOW, &phys_addr_low, dev->s2d_msg_id, true);
amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_HIGH, &phys_addr_hi, dev->s2d_msg_id, true);
+ if (!phys_addr_hi && !phys_addr_low) {
+ dev_err(dev->dev, "STB is not enabled on the system; disable enable_stb or contact system vendor\n");
+ return -EINVAL;
+ }
+
stb_phys_addr = ((u64)phys_addr_hi << 32 | phys_addr_low);
/* Clear msg_port for other SMU operation */
--
2.45.2
