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Date: Tue, 8 Oct 2019 15:16:23 +0300
From: "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>
To: Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"corbet@....net" <corbet@....net>,
"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
"logang@...tatee.com" <logang@...tatee.com>
Subject: Re: [PATCH v8 5/6] PCI: Add hp_mmio_size and hp_mmio_pref_size
parameters
On Fri, Jul 26, 2019 at 12:54:44PM +0000, Nicholas Johnson wrote:
> Add kernel parameter pci=hpmmiosize=nn[KMG] to set MMIO bridge window
> size for hotplug bridges.
>
> Add kernel parameter pci=hpmmioprefsize=nn[KMG] to set MMIO_PREF bridge
> window size for hotplug bridges.
>
> Leave pci=hpmemsize=nn[KMG] unchanged, to prevent disruptions to
> existing users. This sets both MMIO and MMIO_PREF to the same size.
>
> The two new parameters conform to the style of pci=hpiosize=nn[KMG].
>
> Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
This does not apply anymore because of 003d3b2c5f83 ("PCI: Make
pci_hotplug_io_size, mem_size, and bus_size private") so I think you
need to rebase this on top of current mainline.
> ---
> .../admin-guide/kernel-parameters.txt | 9 ++++++-
> drivers/pci/pci.c | 17 ++++++++++---
> drivers/pci/setup-bus.c | 25 +++++++++++--------
> include/linux/pci.h | 3 ++-
> 4 files changed, 38 insertions(+), 16 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 46b826fcb..9bc54cb99 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -3467,8 +3467,15 @@
> hpiosize=nn[KMG] The fixed amount of bus space which is
> reserved for hotplug bridge's IO window.
> Default size is 256 bytes.
> + hpmmiosize=nn[KMG] The fixed amount of bus space which is
> + reserved for hotplug bridge's MMIO window.
> + Default size is 2 megabytes.
> + hpmmioprefsize=nn[KMG] The fixed amount of bus space which is
> + reserved for hotplug bridge's MMIO_PREF window.
> + Default size is 2 megabytes.
> hpmemsize=nn[KMG] The fixed amount of bus space which is
> - reserved for hotplug bridge's memory window.
> + reserved for hotplug bridge's MMIO and
> + MMIO_PREF window.
> Default size is 2 megabytes.
> hpbussize=nn The minimum amount of additional bus numbers
> reserved for buses below a hotplug bridge.
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 29ed5ec1a..6b3857cad 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -85,10 +85,12 @@ unsigned long pci_cardbus_io_size = DEFAULT_CARDBUS_IO_SIZE;
> unsigned long pci_cardbus_mem_size = DEFAULT_CARDBUS_MEM_SIZE;
>
> #define DEFAULT_HOTPLUG_IO_SIZE (256)
> -#define DEFAULT_HOTPLUG_MEM_SIZE (2*1024*1024)
> +#define DEFAULT_HOTPLUG_MMIO_SIZE (2*1024*1024)
> +#define DEFAULT_HOTPLUG_MMIO_PREF_SIZE (2*1024*1024)
> /* pci=hpmemsize=nnM,hpiosize=nn can override this */
> unsigned long pci_hotplug_io_size = DEFAULT_HOTPLUG_IO_SIZE;
> -unsigned long pci_hotplug_mem_size = DEFAULT_HOTPLUG_MEM_SIZE;
> +unsigned long pci_hotplug_mmio_size = DEFAULT_HOTPLUG_MMIO_SIZE;
> +unsigned long pci_hotplug_mmio_pref_size = DEFAULT_HOTPLUG_MMIO_PREF_SIZE;
>
> #define DEFAULT_HOTPLUG_BUS_SIZE 1
> unsigned long pci_hotplug_bus_size = DEFAULT_HOTPLUG_BUS_SIZE;
> @@ -6281,8 +6283,17 @@ static int __init pci_setup(char *str)
> pcie_ecrc_get_policy(str + 5);
> } else if (!strncmp(str, "hpiosize=", 9)) {
> pci_hotplug_io_size = memparse(str + 9, &str);
> + } else if (!strncmp(str, "hpmmiosize=", 11)) {
> + pci_hotplug_mmio_size =
> + memparse(str + 11, &str);
I would keep this in single line disregarding the 80 char limit.
> + } else if (!strncmp(str, "hpmmioprefsize=", 15)) {
> + pci_hotplug_mmio_pref_size =
> + memparse(str + 15, &str);
Ditto
> } else if (!strncmp(str, "hpmemsize=", 10)) {
> - pci_hotplug_mem_size = memparse(str + 10, &str);
> + pci_hotplug_mmio_size =
> + memparse(str + 10, &str);
Ditto.
> + pci_hotplug_mmio_pref_size =
> + memparse(str + 10, &str);
Ditto.
> } else if (!strncmp(str, "hpbussize=", 10)) {
> pci_hotplug_bus_size =
> simple_strtoul(str + 10, &str, 0);
> diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
> index 7e1dc892a..345ecf16d 100644
> --- a/drivers/pci/setup-bus.c
> +++ b/drivers/pci/setup-bus.c
> @@ -1178,7 +1178,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
> {
> struct pci_dev *dev;
> unsigned long mask, prefmask, type2 = 0, type3 = 0;
> - resource_size_t additional_mem_size = 0, additional_io_size = 0;
> + resource_size_t additional_io_size = 0, additional_mmio_size = 0,
> + additional_mmio_pref_size = 0;
Maybe align them like
resource_size_t additional_io_size = 0, additional_mmio_size = 0,
additional_mmio_pref_size = 0;
> struct resource *b_res;
> int ret;
>
> @@ -1212,7 +1213,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
> pci_bridge_check_ranges(bus);
> if (bus->self->is_hotplug_bridge) {
> additional_io_size = pci_hotplug_io_size;
> - additional_mem_size = pci_hotplug_mem_size;
> + additional_mmio_size = pci_hotplug_mmio_size;
> + additional_mmio_pref_size = pci_hotplug_mmio_pref_size;
> }
> /* Fall through */
> default:
> @@ -1230,9 +1232,9 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
> if (b_res[2].flags & IORESOURCE_MEM_64) {
> prefmask |= IORESOURCE_MEM_64;
> ret = pbus_size_mem(bus, prefmask, prefmask,
> - prefmask, prefmask,
> - realloc_head ? 0 : additional_mem_size,
> - additional_mem_size, realloc_head);
> + prefmask, prefmask,
> + realloc_head ? 0 : additional_mmio_pref_size,
> + additional_mmio_pref_size, realloc_head);
>
> /*
> * If successful, all non-prefetchable resources
> @@ -1254,9 +1256,9 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
> if (!type2) {
> prefmask &= ~IORESOURCE_MEM_64;
> ret = pbus_size_mem(bus, prefmask, prefmask,
> - prefmask, prefmask,
> - realloc_head ? 0 : additional_mem_size,
> - additional_mem_size, realloc_head);
> + prefmask, prefmask,
> + realloc_head ? 0 : additional_mmio_pref_size,
> + additional_mmio_pref_size, realloc_head);
>
> /*
> * If successful, only non-prefetchable resources
> @@ -1265,7 +1267,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
> if (ret == 0)
> mask = prefmask;
> else
> - additional_mem_size += additional_mem_size;
> + additional_mmio_size +=
> + additional_mmio_pref_size;
Here also looks better if you put them single line.
>
> type2 = type3 = IORESOURCE_MEM;
> }
> @@ -1285,8 +1288,8 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
> * prefetchable resource in a 64-bit prefetchable window.
> */
> pbus_size_mem(bus, mask, IORESOURCE_MEM, type2, type3,
> - realloc_head ? 0 : additional_mem_size,
> - additional_mem_size, realloc_head);
> + realloc_head ? 0 : additional_mmio_size,
> + additional_mmio_size, realloc_head);
> break;
> }
> }
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 9e700d9f9..1bde5763a 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -2031,7 +2031,8 @@ extern u8 pci_dfl_cache_line_size;
> extern u8 pci_cache_line_size;
>
> extern unsigned long pci_hotplug_io_size;
> -extern unsigned long pci_hotplug_mem_size;
> +extern unsigned long pci_hotplug_mmio_size;
> +extern unsigned long pci_hotplug_mmio_pref_size;
> extern unsigned long pci_hotplug_bus_size;
>
> /* Architecture-specific versions may override these (weak) */
> --
> 2.22.0
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