6.11-stable review patch. If anyone has any objections, please let me know.
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From: Corey Hickey bugfood-c@fatooh.org
[ Upstream commit bceec87a73804bb4c33b9a6c96e2d27cd893a801 ]
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-3e04-4549-9a86-284b9b44... 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@amd.com Signed-off-by: Corey Hickey bugfood-c@fatooh.org Reviewed-by: Ilpo Järvinen ilpo.jarvinen@linux.intel.com Link: https://lore.kernel.org/r/20241028180241.1341624-1-bugfood-ml@fatooh.org 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/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 bbb8edb62e009..5669f94c3d06b 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 */