diff options
| author | M. Vefa Bicakci <m.v.b@runbox.com> | 2019-08-16 04:41:39 +0300 |
|---|---|---|
| committer | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2019-09-07 19:53:18 +0300 |
| commit | 7d505758b1e556cdf65a5e451744fe0ae8063d17 (patch) | |
| tree | bb36ec6ab17ed6ebbae8011726e668389ccccd21 /drivers/platform | |
| parent | 07779c33a7282366f979e384de263e42aa422ada (diff) | |
| download | linux-7d505758b1e556cdf65a5e451744fe0ae8063d17.tar.xz | |
platform/x86: intel_pmc_core: Do not ioremap RAM
On a Xen-based PVH virtual machine with more than 4 GiB of RAM,
intel_pmc_core fails initialization with the following warning message
from the kernel, indicating that the driver is attempting to ioremap
RAM:
ioremap on RAM at 0x00000000fe000000 - 0x00000000fe001fff
WARNING: CPU: 1 PID: 434 at arch/x86/mm/ioremap.c:186 __ioremap_caller.constprop.0+0x2aa/0x2c0
...
Call Trace:
? pmc_core_probe+0x87/0x2d0 [intel_pmc_core]
pmc_core_probe+0x87/0x2d0 [intel_pmc_core]
This issue appears to manifest itself because of the following fallback
mechanism in the driver:
if (lpit_read_residency_count_address(&slp_s0_addr))
pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT;
The validity of address PMC_BASE_ADDR_DEFAULT (i.e., 0xFE000000) is not
verified by the driver, which is what this patch introduces. With this
patch, if address PMC_BASE_ADDR_DEFAULT is in RAM, then the driver will
not attempt to ioremap the aforementioned address.
Signed-off-by: M. Vefa Bicakci <m.v.b@runbox.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Diffstat (limited to 'drivers/platform')
| -rw-r--r-- | drivers/platform/x86/intel_pmc_core.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c index c510d0d72475..3b6b8dcc4767 100644 --- a/drivers/platform/x86/intel_pmc_core.c +++ b/drivers/platform/x86/intel_pmc_core.c @@ -878,10 +878,14 @@ static int pmc_core_probe(struct platform_device *pdev) if (pmcdev->map == &spt_reg_map && !pci_dev_present(pmc_pci_ids)) pmcdev->map = &cnp_reg_map; - if (lpit_read_residency_count_address(&slp_s0_addr)) + if (lpit_read_residency_count_address(&slp_s0_addr)) { pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT; - else + + if (page_is_ram(PHYS_PFN(pmcdev->base_addr))) + return -ENODEV; + } else { pmcdev->base_addr = slp_s0_addr - pmcdev->map->slp_s0_offset; + } pmcdev->regbase = ioremap(pmcdev->base_addr, pmcdev->map->regmap_length); |