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Message-Id: <20191003154551.007317335@linuxfoundation.org>
Date: Thu, 3 Oct 2019 17:52:41 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, "M. Vefa Bicakci" <m.v.b@...box.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.2 183/313] platform/x86: intel_pmc_core: Do not ioremap RAM
From: M. Vefa Bicakci <m.v.b@...box.com>
[ 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@...box.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/platform/x86/intel_pmc_core.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index be6cda89dcf5b..01a530e2f8017 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);
--
2.20.1
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