cxl: Use image state defaults for reloading FPGA

Select defaults such that a PERST causes flash image reload.  Select which
image based on what the card is set up to load.

CXL_VSEC_PERST_LOADS_IMAGE selects whether PERST assertion causes flash image
load.

CXL_VSEC_PERST_SELECT_USER selects which image is loaded on the next PERST.

cxl_update_image_control writes these bits into the VSEC.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2 files changed, 41 insertions, 2 deletions

diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 0df04380bfd6..518c4c6e6151 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -488,6 +488,7 @@ void cxl_release_one_irq(struct cxl *adapter, int hwirq);
 int cxl_alloc_irq_ranges(struct cxl_irq_ranges *irqs, struct cxl *adapter, unsigned int num);
 void cxl_release_irq_ranges(struct cxl_irq_ranges *irqs, struct cxl *adapter);
 int cxl_setup_irq(struct cxl *adapter, unsigned int hwirq, unsigned int virq);
+int cxl_update_image_control(struct cxl *adapter);
 
 /* common == phyp + powernv */
 struct cxl_process_element_common {
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 2ccd0a91d486..014f4c928e4c 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -361,6 +361,41 @@ int cxl_setup_irq(struct cxl *adapter, unsigned int hwirq,
         return pnv_cxl_ioda_msi_setup(dev, hwirq, virq);
 }
 
+int cxl_update_image_control(struct cxl *adapter)
+{
+        struct pci_dev *dev = to_pci_dev(adapter->dev.parent);
+        int rc;
+        int vsec;
+        u8 image_state;
+
+        if (!(vsec = find_cxl_vsec(dev))) {
+                dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n");
+                return -ENODEV;
+        }
+
+        if ((rc = CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state))) {
+                dev_err(&dev->dev, "failed to read image state: %i\n", rc);
+                return rc;
+        }
+
+        if (adapter->perst_loads_image)
+                image_state |= CXL_VSEC_PERST_LOADS_IMAGE;
+        else
+                image_state &= ~CXL_VSEC_PERST_LOADS_IMAGE;
+
+        if (adapter->perst_select_user)
+                image_state |= CXL_VSEC_PERST_SELECT_USER;
+        else
+                image_state &= ~CXL_VSEC_PERST_SELECT_USER;
+
+        if ((rc = CXL_WRITE_VSEC_IMAGE_STATE(dev, vsec, image_state))) {
+                dev_err(&dev->dev, "failed to update image control: %i\n", rc);
+                return rc;
+        }
+
+        return 0;
+}
+
 int cxl_alloc_one_irq(struct cxl *adapter)
 {
         struct pci_dev *dev = to_pci_dev(adapter->dev.parent);
@@ -770,8 +805,8 @@ static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev)
         CXL_READ_VSEC_BASE_IMAGE(dev, vsec, &adapter->base_image);
         CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state);
         adapter->user_image_loaded = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED);
-        adapter->perst_loads_image = !!(image_state & CXL_VSEC_PERST_LOADS_IMAGE);
-        adapter->perst_select_user = !!(image_state & CXL_VSEC_PERST_SELECT_USER);
+        adapter->perst_loads_image = true;
+        adapter->perst_select_user = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED);
 
         CXL_READ_VSEC_NAFUS(dev, vsec, &adapter->slices);
         CXL_READ_VSEC_AFU_DESC_OFF(dev, vsec, &afu_desc_off);
@@ -879,6 +914,9 @@ static struct cxl *cxl_init_adapter(struct pci_dev *dev)
         if ((rc = cxl_vsec_looks_ok(adapter, dev)))
                 goto err2;
 
+        if ((rc = cxl_update_image_control(adapter)))
+                goto err2;
+
         if ((rc = cxl_map_adapter_regs(adapter, dev)))
                 goto err2;