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| author | M. Vefa Bicakci <m.v.b@runbox.com> | 2019-08-15 21:41:39 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:13:54 +0200 |
| commit | a7963f92406db6d85816b9a7cd2df6477ea7b42c (patch) | |
| tree | 0e02f3b6571a6dcf377256a6d144ee760686e73a /drivers/platform/x86/intel_pmc_core.c | |
| parent | c7e971d4f027bb0cb7ff74000e6d192f2bc4a424 (diff) | |
| download | linux-stable-a7963f92406db6d85816b9a7cd2df6477ea7b42c.tar.gz linux-stable-a7963f92406db6d85816b9a7cd2df6477ea7b42c.tar.bz2 linux-stable-a7963f92406db6d85816b9a7cd2df6477ea7b42c.zip | |
platform/x86: intel_pmc_core: Do not ioremap RAM
[ Upstream commit 7d505758b1e556cdf65a5e451744fe0ae8063d17 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/platform/x86/intel_pmc_core.c')
| -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 be6cda89dcf5..01a530e2f801 100644 --- a/drivers/platform/x86/intel_pmc_core.c +++ b/drivers/platform/x86/intel_pmc_core.c @@ -882,10 +882,14 @@ 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); |