On Mon, 28 Oct 2024, Corey Hickey wrote: > 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 */ > Thanks for the update, Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx> -- i.
