[PATCH 03/11] platform/x86/intel/vsec: Add base address field

David E. Box
2023-03-15T18:34:26Z

Some Intel PCIe VSEC capabilities may be emulated in MMIO. In such cases
the BAR is not readable from config space. Provide a field for drivers to
indicate the base address that is to be used.

Signed-off-by: David E. Box <david.e.box@linux.intel.com>
---
drivers/platform/x86/intel/pmt/class.c | 14 +++++++++++---
drivers/platform/x86/intel/vsec.c | 10 ++++++++--
drivers/platform/x86/intel/vsec.h | 2 ++
3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/intel/pmt/class.c b/drivers/platform/x86/intel/pmt/class.c
index 9f505c6ef278..7136475d4ab5 100644
--- a/drivers/platform/x86/intel/pmt/class.c
+++ b/drivers/platform/x86/intel/pmt/class.c
@@ -161,10 +161,11 @@ static struct class intel_pmt_class = {

static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,
struct intel_pmt_header *header,
- struct device *dev,
+ struct intel_vsec_device *ivdev,
struct resource *disc_res)
{
- struct pci_dev *pci_dev = to_pci_dev(dev->parent);
+ struct pci_dev *pci_dev = ivdev->pcidev;
+ struct device *dev = &ivdev->auxdev.dev;
u8 bir;

/*
@@ -216,6 +217,13 @@ static int intel_pmt_populate_entry(struct intel_pmt_entry *entry,

break;
case ACCESS_BARID:
+ /* Use the provided base address if it exists */
+ if (ivdev->base_addr) {
+ entry->base_addr = ivdev->base_addr +
+ GET_ADDRESS(header->base_offset);
+ break;
+ }
+
/*
* If another BAR was specified then the base offset
* represents the offset within that BAR. SO retrieve the
@@ -320,7 +328,7 @@ int intel_pmt_dev_create(struct intel_pmt_entry *entry, struct intel_pmt_namespa
if (ret)
return ret;

- ret = intel_pmt_populate_entry(entry, &header, dev, disc_res);
+ ret = intel_pmt_populate_entry(entry, &header, intel_vsec_dev, disc_res);
if (ret)
return ret;

diff --git a/drivers/platform/x86/intel/vsec.c b/drivers/platform/x86/intel/vsec.c
index 0d5cf250e288..77063f699a1d 100644
--- a/drivers/platform/x86/intel/vsec.c
+++ b/drivers/platform/x86/intel/vsec.c
@@ -153,6 +153,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
struct intel_vsec_device *intel_vsec_dev;
struct resource *res, *tmp;
unsigned long quirks = info->quirks;
+ u64 base_addr;
int i;

if (!intel_vsec_supported(header->id, info->caps))
@@ -181,14 +182,18 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
if (quirks & VSEC_QUIRK_TABLE_SHIFT)
header->offset >>= TABLE_OFFSET_SHIFT;

+ if (info->base_addr)
+ base_addr = info->base_addr;
+ else
+ base_addr = pdev->resource[header->tbir].start;
+
/*
* The DVSEC/VSEC contains the starting offset and count for a block of
* discovery tables. Create a resource array of these tables to the
* auxiliary device driver.
*/
for (i = 0, tmp = res; i < header->num_entries; i++, tmp++) {
- tmp->start = pdev->resource[header->tbir].start +
- header->offset + i * (header->entry_size * sizeof(u32));
+ tmp->start = base_addr + header->offset + i * (header->entry_size * sizeof(u32));
tmp->end = tmp->start + (header->entry_size * sizeof(u32)) - 1;
tmp->flags = IORESOURCE_MEM;

@@ -206,6 +211,7 @@ static int intel_vsec_add_dev(struct pci_dev *pdev, struct intel_vsec_header *he
intel_vsec_dev->resource = res;
intel_vsec_dev->num_resources = header->num_entries;
intel_vsec_dev->quirks = info->quirks;
+ intel_vsec_dev->base_addr = info->base_addr;

if (header->id == VSEC_ID_SDSI)
intel_vsec_dev->ida = &intel_vsec_sdsi_ida;
diff --git a/drivers/platform/x86/intel/vsec.h b/drivers/platform/x86/intel/vsec.h
index 54fdea93f762..4157ec546cd3 100644
--- a/drivers/platform/x86/intel/vsec.h
+++ b/drivers/platform/x86/intel/vsec.h
@@ -74,6 +74,7 @@ struct intel_vsec_platform_info {
struct intel_vsec_header **headers;
unsigned long caps;
unsigned long quirks;
+ u64 base_addr;
};

struct intel_vsec_device {
@@ -86,6 +87,7 @@ struct intel_vsec_device {
void *priv_data;
size_t priv_data_size;
unsigned long quirks;
+ u64 base_addr;
};

int intel_vsec_add_aux(struct pci_dev *pdev, struct device *parent,
--
2.34.1