lkml.org 
[lkml]   [2019]   [Nov]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 04/10] powerpc: Map & release OpenCAPI LPC memory
From
Date


Le 25/10/2019 à 06:46, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@d-silva.org>
>
> This patch adds platform support to map & release LPC memory.
>
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> ---
> arch/powerpc/include/asm/pnv-ocxl.h | 2 ++
> arch/powerpc/platforms/powernv/ocxl.c | 41 +++++++++++++++++++++++++++
> include/linux/memory_hotplug.h | 5 ++++
> mm/memory_hotplug.c | 3 +-
> 4 files changed, 50 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/include/asm/pnv-ocxl.h b/arch/powerpc/include/asm/pnv-ocxl.h
> index 7de82647e761..f8f8ffb48aa8 100644
> --- a/arch/powerpc/include/asm/pnv-ocxl.h
> +++ b/arch/powerpc/include/asm/pnv-ocxl.h
> @@ -32,5 +32,7 @@ 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);
> +extern u64 pnv_ocxl_platform_lpc_setup(struct pci_dev *pdev, u64 size);
> +extern void pnv_ocxl_platform_lpc_release(struct pci_dev *pdev);
>
> #endif /* _ASM_PNV_OCXL_H */
> diff --git a/arch/powerpc/platforms/powernv/ocxl.c b/arch/powerpc/platforms/powernv/ocxl.c
> index 8c65aacda9c8..c6d4234e0aba 100644
> --- a/arch/powerpc/platforms/powernv/ocxl.c
> +++ b/arch/powerpc/platforms/powernv/ocxl.c
> @@ -475,6 +475,47 @@ void pnv_ocxl_spa_release(void *platform_data)
> }
> EXPORT_SYMBOL_GPL(pnv_ocxl_spa_release);
>
> +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 = (pdev->bus->number << 8) | pdev->devfn;
> + u64 base_addr = 0;
> + int rc;
> +
> + rc = opal_npu_mem_alloc(phb->opal_id, bdfn, size, &base_addr);
> + 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);
> +
> + 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 = (pdev->bus->number << 8) | pdev->devfn;
> + 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);
> +
> +
> int pnv_ocxl_spa_remove_pe_from_cache(void *platform_data, int pe_handle)
> {
> struct spa_data *data = (struct spa_data *) platform_data;
> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index f46ea71b4ffd..3f5f1a642abe 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -339,6 +339,11 @@ static inline int remove_memory(int nid, u64 start, u64 size)
> static inline void __remove_memory(int nid, u64 start, u64 size) {}
> #endif /* CONFIG_MEMORY_HOTREMOVE */
>
> +#if CONFIG_MEMORY_HOTPLUG_SPARSE
> +int check_hotplug_memory_addressable(unsigned long pfn,
> + unsigned long nr_pages);
> +#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
> +
> extern void __ref free_area_init_core_hotplug(int nid);
> extern int __add_memory(int nid, u64 start, u64 size);
> extern int add_memory(int nid, u64 start, u64 size);
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 2cecf07b396f..b39827dbd071 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -278,7 +278,7 @@ static int check_pfn_span(unsigned long pfn, unsigned long nr_pages,
> return 0;
> }
>
> -static int check_hotplug_memory_addressable(unsigned long pfn,
> +int check_hotplug_memory_addressable(unsigned long pfn,
> unsigned long nr_pages)
> {
> const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1;
> @@ -294,6 +294,7 @@ static int check_hotplug_memory_addressable(unsigned long pfn,
>
> return 0;
> }
> +EXPORT_SYMBOL_GPL(check_hotplug_memory_addressable);


Making check_hotplug_memory_addressable() visible in the kernel could be
a separate patch, to make sure it gets the proper attention instead of
being buried in a powerpc patch.
Also, already mentioned, but it shouldn't be exported.


>
> /*
> * Reasonably generic function for adding memory. It is
>

\
 
 \ /
  Last update: 2019-11-07 19:00    [W:0.353 / U:0.384 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site