Le 21/02/2020 à 04:26, Alastair D'Silva a écrit :
From: Alastair D'Silva <alastair@xxxxxxxxxxx>
This patch adds platform support to map & release LPC memory.
Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
---
arch/powerpc/include/asm/pnv-ocxl.h | 4 +++
arch/powerpc/platforms/powernv/ocxl.c | 43 +++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/arch/powerpc/include/asm/pnv-ocxl.h b/arch/powerpc/include/asm/pnv-ocxl.h
index 7de82647e761..0b2a6707e555 100644
--- a/arch/powerpc/include/asm/pnv-ocxl.h
+++ b/arch/powerpc/include/asm/pnv-ocxl.h
@@ -32,5 +32,9 @@ extern int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle)
extern int pnv_ocxl_alloc_xive_irq(u32 *irq, u64 *trigger_addr);
extern void pnv_ocxl_free_xive_irq(u32 irq);
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size);
+void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev);
+#endif
This breaks the compilation of the ocxl driver if CONFIG_MEMORY_HOTPLUG=n
Those functions still make sense even without memory hotplug, for
example in the context of the implementation you had to access opencapi
LPC memory through mmap(). The #ifdef is really needed only around the
check_hotplug_memory_addressable() call.
Fred
#endif /* _ASM_PNV_OCXL_H */
diff --git a/arch/powerpc/platforms/powernv/ocxl.c b/arch/powerpc/platforms/powernv/ocxl.c
index 8c65aacda9c8..f2edbcc67361 100644
--- a/arch/powerpc/platforms/powernv/ocxl.c
+++ b/arch/powerpc/platforms/powernv/ocxl.c
@@ -475,6 +475,49 @@ void pnv_ocxl_spa_release(void *platform_data)
}
EXPORT_SYMBOL_GPL(pnv_ocxl_spa_release);
+#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
+u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ struct pnv_phb *phb = hose->private_data;
+ u32 bdfn = pci_dev_id(pdev);
+ __be64 base_addr_be64;
+ u64 base_addr;
+ int rc;
+
+ rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size, &base_addr_be64);
+ if (rc) {
+ dev_warn(&pdev->dev,
+ "OPAL could not allocate LPC memory, rc=%d\n", rc);
+ return 0;
+ }
+
+ base_addr = be64_to_cpu(base_addr_be64);
+
+ rc = check_hotplug_memory_addressable(base_addr >> PAGE_SHIFT,
+ size >> PAGE_SHIFT);
+ if (rc)
+ return 0;
+
+ return base_addr;
+}
+EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_setup);
+
+void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ struct pnv_phb *phb = hose->private_data;
+ u32 bdfn = pci_dev_id(pdev);
+ int rc;
+
+ rc = opal_npu_mem_release(phb->opal_id, bdfn);
+ if (rc)
+ dev_warn(&pdev->dev,
+ "OPAL reported rc=%d when releasing LPC memory\n", rc);
+}
+EXPORT_SYMBOL_GPL(pnv_ocxl_platform_lpc_release);
+#endif
+
int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle)
{
struct spa_data *data = (struct spa_data *) platform_data;
