[PATCH v3 03/27] powerpc: Map & release OpenCAPI LPC memory

[Frederic Barrat]

Le 21/02/2020 à 04:26, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair at d-silva.org>
> 
> This patch adds platform support to map & release LPC memory.
> 
> Signed-off-by: Alastair D'Silva <alastair at d-silva.org>
> ---
>   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;
>