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intel_th: Add "rtit" source device

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In some versions of Intel TH, the Software Trace Hub (STH) has a second
MMIO BAR dedicated to the input from Intel PT. This calls for a new
subdevice that will be enumerated if the corresponding BAR is present.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Shishkin 2019-05-03 11:44:38 +03:00 committed by Greg Kroah-Hartman
parent 23f667494b
commit fc027f4ce7
3 changed files with 27 additions and 3 deletions
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18
drivers/hwtracing/intel_th/core.c
View File

@ -500,6 +500,24 @@ static const struct intel_th_subdevice {
.name = "sth",
.type = INTEL_TH_SOURCE,
},
{
.nres = 2,
.res = {
{
.start = REG_STH_OFFSET,
.end = REG_STH_OFFSET + REG_STH_LENGTH - 1,
.flags = IORESOURCE_MEM,
},
{
.start = TH_MMIO_RTIT,
.end = 0,
.flags = IORESOURCE_MEM,
},
},
.id = -1,
.name = "rtit",
.type = INTEL_TH_SOURCE,
},
{
.nres = 1,
.res = {

1
drivers/hwtracing/intel_th/intel_th.h
View File

@ -228,6 +228,7 @@ int intel_th_output_enable(struct intel_th *th, unsigned int otype);
enum th_mmio_idx {
TH_MMIO_CONFIG = 0,
TH_MMIO_SW = 1,
TH_MMIO_RTIT = 2,
TH_MMIO_END,
};

11
drivers/hwtracing/intel_th/pci.c
View File

@ -20,6 +20,7 @@
enum {
TH_PCI_CONFIG_BAR = 0,
TH_PCI_STH_SW_BAR = 2,
TH_PCI_RTIT_BAR = 4,
};
#define BAR_MASK (BIT(TH_PCI_CONFIG_BAR) | BIT(TH_PCI_STH_SW_BAR))
@ -75,8 +76,8 @@ static int intel_th_pci_probe(struct pci_dev *pdev,
[TH_MMIO_CONFIG] = pdev->resource[TH_PCI_CONFIG_BAR],
[TH_MMIO_SW] = pdev->resource[TH_PCI_STH_SW_BAR],
};
int err, r = TH_MMIO_SW + 1;
struct intel_th *th;
int err;
err = pcim_enable_device(pdev);
if (err)
@ -86,8 +87,12 @@ static int intel_th_pci_probe(struct pci_dev *pdev,
if (err)
return err;
th = intel_th_alloc(&pdev->dev, drvdata, resource, TH_MMIO_END,
pdev->irq);
if (pdev->resource[TH_PCI_RTIT_BAR].start) {
resource[TH_MMIO_RTIT] = pdev->resource[TH_PCI_RTIT_BAR];
r++;
}
th = intel_th_alloc(&pdev->dev, drvdata, resource, r, pdev->irq);
if (IS_ERR(th))
return PTR_ERR(th);