The core of the driver expects the resource array from the glue layer to be indexed by even numbers, as is the case for 64-bit PCI resources. This doesn't hold true for others, ACPI in this instance, which leads to an out-of-bounds access and an ioremap() on whatever address that access fetches.
This patch fixes the problem by reading resource array differently based on whether the 64-bit flag is set, which would indicate PCI glue layer.
Signed-off-by: Alexander Shishkin alexander.shishkin@linux.intel.com Fixes: ebc57e399b8e ("intel_th: Add ACPI glue layer") CC: stable@vger.kernel.org # v4.17+ --- drivers/hwtracing/intel_th/core.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c index 4e70ecee2103..fc6b7f8b62fb 100644 --- a/drivers/hwtracing/intel_th/core.c +++ b/drivers/hwtracing/intel_th/core.c @@ -488,7 +488,7 @@ static const struct intel_th_subdevice { .flags = IORESOURCE_MEM, }, { - .start = TH_MMIO_SW, + .start = 1, /* use resource[1] */ .end = 0, .flags = IORESOURCE_MEM, }, @@ -581,6 +581,7 @@ intel_th_subdevice_alloc(struct intel_th *th, struct intel_th_device *thdev; struct resource res[3]; unsigned int req = 0; + bool is64bit = false; int r, err;
thdev = intel_th_device_alloc(th, subdev->type, subdev->name, @@ -590,12 +591,18 @@ intel_th_subdevice_alloc(struct intel_th *th,
thdev->drvdata = th->drvdata;
+ for (r = 0; r < th->num_resources; r++) + if (th->resource[r].flags & IORESOURCE_MEM_64) { + is64bit = true; + break; + } + memcpy(res, subdev->res, sizeof(struct resource) * subdev->nres);
for (r = 0; r < subdev->nres; r++) { struct resource *devres = th->resource; - int bar = TH_MMIO_CONFIG; + int bar = 0; /* cut subdevices' MMIO from resource[0] */
/* * Take .end == 0 to mean 'take the whole bar', @@ -604,6 +611,8 @@ intel_th_subdevice_alloc(struct intel_th *th, */ if (!res[r].end && res[r].flags == IORESOURCE_MEM) { bar = res[r].start; + if (is64bit) + bar *= 2; res[r].start = 0; res[r].end = resource_size(&devres[bar]) - 1; }