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Message-ID: <20170131001551.GC20550@bhelgaas-glaptop.roam.corp.google.com>
Date: Mon, 30 Jan 2017 18:15:51 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: "zhichang.yuan" <yuanzhichang@...ilicon.com>
Cc: catalin.marinas@....com, will.deacon@....com, robh+dt@...nel.org,
frowand.list@...il.com, bhelgaas@...gle.com, rafael@...nel.org,
mark.rutland@....com, brian.starkey@....com, olof@...om.net,
arnd@...db.de, linux-arm-kernel@...ts.infradead.org,
lorenzo.pieralisi@....com, benh@...nel.crashing.org,
linux-kernel@...r.kernel.org, linuxarm@...wei.com,
devicetree@...r.kernel.org, linux-pci@...r.kernel.org,
linux-serial@...r.kernel.org, minyard@....org, liviu.dudau@....com,
zourongrong@...il.com, john.garry@...wei.com,
gabriele.paoloni@...wei.com, zhichang.yuan02@...il.com,
kantyzc@....com, xuwei5@...ilicon.com
Subject: Re: [PATCH V6 2/5] PCI: Adapt pci_register_io_range() for
indirect-IO and PCI I/O translation
On Tue, Jan 24, 2017 at 03:05:22PM +0800, zhichang.yuan wrote:
> After indirect-IO is introduced, system must can assigned indirect-IO devices
> with logical I/O ranges which are different from those for PCI I/O devices.
> Otherwise, I/O accessors can't identify whether the I/O port is for memory
> mapped I/O or indirect-IO.
> As current helper, pci_register_io_range(), is used for PCI I/O ranges
> registration and translation, indirect-IO devices should also apply these
> helpers to manage the I/O ranges. It will be easy to ensure the assigned
> logical I/O ranges unique.
> But for indirect-IO devices, there is no cpu address. The current
> pci_register_io_range() can not work for this case.
>
> This patch makes some changes on the pci_register_io_range() to support the
> I/O range registration with device's fwnode also. After this, the indirect-IO
> devices can register the device-local I/O range to system logical I/O and
> easily perform the translation between device-local I/O range and sytem
> logical I/O range.
>
> Signed-off-by: zhichang.yuan <yuanzhichang@...ilicon.com>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@...wei.com>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
I had a couple trivial comments, but you can include my:
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com> # drivers/pci parts
in your next revision. I don't know who you have in mind to merge this;
it doesn't really touch much of PCI. But let me know if you need anything
else from me.
> ---
> drivers/acpi/pci_root.c | 12 +++++-------
> drivers/of/address.c | 8 ++------
> drivers/pci/pci.c | 44 ++++++++++++++++++++++++++++++++++++++++----
> include/linux/pci.h | 7 +++++--
> 4 files changed, 52 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
> index bf601d4..6cadf05 100644
> --- a/drivers/acpi/pci_root.c
> +++ b/drivers/acpi/pci_root.c
> @@ -730,7 +730,8 @@ static void acpi_pci_root_validate_resources(struct device *dev,
> }
> }
>
> -static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
> +static void acpi_pci_root_remap_iospace(struct fwnode_handle *node,
> + struct resource_entry *entry)
> {
> #ifdef PCI_IOBASE
> struct resource *res = entry->res;
> @@ -739,11 +740,7 @@ static void acpi_pci_root_remap_iospace(struct resource_entry *entry)
> resource_size_t length = resource_size(res);
> unsigned long port;
>
> - if (pci_register_io_range(cpu_addr, length))
> - goto err;
> -
> - port = pci_address_to_pio(cpu_addr);
> - if (port == (unsigned long)-1)
> + if (pci_register_io_range(node, cpu_addr, length, &port))
> goto err;
>
> res->start = port;
> @@ -781,7 +778,8 @@ int acpi_pci_probe_root_resources(struct acpi_pci_root_info *info)
> else {
> resource_list_for_each_entry_safe(entry, tmp, list) {
> if (entry->res->flags & IORESOURCE_IO)
> - acpi_pci_root_remap_iospace(entry);
> + acpi_pci_root_remap_iospace(&device->fwnode,
> + entry);
>
> if (entry->res->flags & IORESOURCE_DISABLED)
> resource_list_destroy_entry(entry);
> diff --git a/drivers/of/address.c b/drivers/of/address.c
> index 02b2903..d85d228 100644
> --- a/drivers/of/address.c
> +++ b/drivers/of/address.c
> @@ -2,6 +2,7 @@
> #define pr_fmt(fmt) "OF: " fmt
>
> #include <linux/device.h>
> +#include <linux/fwnode.h>
> #include <linux/io.h>
> #include <linux/ioport.h>
> #include <linux/module.h>
> @@ -323,14 +324,9 @@ int of_pci_range_to_resource(struct of_pci_range *range,
>
> if (res->flags & IORESOURCE_IO) {
> unsigned long port;
> - err = pci_register_io_range(range->cpu_addr, range->size);
> + err = pci_register_io_range(&np->fwnode, range->cpu_addr, range->size, &port);
> if (err)
> goto invalid_range;
> - port = pci_address_to_pio(range->cpu_addr);
> - if (port == (unsigned long)-1) {
> - err = -EINVAL;
> - goto invalid_range;
> - }
> res->start = port;
> } else {
> if ((sizeof(resource_size_t) < 8) &&
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index a881c0d..5289221 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -3241,6 +3241,7 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
> #ifdef PCI_IOBASE
> struct io_range {
> struct list_head list;
> + struct fwnode_handle *node;
> phys_addr_t start;
> resource_size_t size;
> };
> @@ -3253,7 +3254,8 @@ struct io_range {
> * Record the PCI IO range (expressed as CPU physical address + size).
> * Return a negative value if an error has occured, zero otherwise
> */
> -int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
> +int __weak pci_register_io_range(struct fwnode_handle *node, phys_addr_t addr,
> + resource_size_t size, unsigned long *port)
> {
> int err = 0;
>
> @@ -3261,10 +3263,31 @@ int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
> struct io_range *range;
> resource_size_t allocated_size = 0;
>
> + /*
> + * As indirect-IO which support multiple bus instances is introduced,
> + * the input 'addr' is probably not page-aligned. If the PCI I/O
> + * ranges are registered after indirect-IO, there is risk that the
> + * start logical PIO assigned to PCI I/O is not page-aligned.
> + * This will cause some I/O subranges are not remapped or overlapped
> + * in pci_remap_iospace() handling.
> + */
> + WARN_ON(addr != IO_RANGE_IOEXT && !(addr & PAGE_MASK));
> + /*
> + * MMIO will call ioremap, it is better to align size with PAGE_SIZE,
> + * then the return linux virtual PIO is page-aligned.
> + */
> + if (size & PAGE_MASK)
> + size = PAGE_ALIGN(size);
> +
> /* check if the range hasn't been previously recorded */
> spin_lock(&io_range_lock);
> list_for_each_entry(range, &io_range_list, list) {
> - if (addr >= range->start && addr + size <= range->start + size) {
> + if (node == range->node)
> + goto end_register;
> +
> + if (addr != IO_RANGE_IOEXT &&
> + addr >= range->start &&
> + addr + size <= range->start + size) {
> /* range already registered, bail out */
> goto end_register;
> }
> @@ -3290,6 +3313,7 @@ int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
> goto end_register;
> }
>
> + range->node = node;
> range->start = addr;
> range->size = size;
>
> @@ -3297,6 +3321,14 @@ int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
>
> end_register:
> spin_unlock(&io_range_lock);
> +
> + *port = allocated_size;
> +#else
> + /*
> + * powerpc and microblaze have their own registration,
> + * just look up the value here
> + */
> + *port = pci_address_to_pio(addr);
> #endif
>
> return err;
> @@ -3315,7 +3347,9 @@ phys_addr_t pci_pio_to_address(unsigned long pio)
>
> spin_lock(&io_range_lock);
> list_for_each_entry(range, &io_range_list, list) {
> - if (pio >= allocated_size && pio < allocated_size + range->size) {
> + if (range->start != IO_RANGE_IOEXT &&
> + pio >= allocated_size &&
> + pio < allocated_size + range->size) {
> address = range->start + pio - allocated_size;
> break;
> }
> @@ -3336,7 +3370,9 @@ unsigned long __weak pci_address_to_pio(phys_addr_t address)
>
> spin_lock(&io_range_lock);
> list_for_each_entry(res, &io_range_list, list) {
> - if (address >= res->start && address < res->start + res->size) {
> + if (res->start != IO_RANGE_IOEXT &&
> + address >= res->start &&
> + address < res->start + res->size) {
> addr = address - res->start + offset;
> break;
> }
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index e2d1a12..8d91af8 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -34,6 +34,9 @@
>
> #include <linux/pci_ids.h>
>
> +/* the macro below flags an invalid cpu address
> + * and is used by IO special hosts */
> +#define IO_RANGE_IOEXT (resource_size_t)(-1ull)
> /*
> * The PCI interface treats multi-function devices as independent
> * devices. The slot/function address of each device is encoded
> @@ -1197,8 +1200,8 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
> resource_size_t),
> void *alignf_data);
>
> -
> -int pci_register_io_range(phys_addr_t addr, resource_size_t size);
> +int pci_register_io_range(struct fwnode_handle *node, phys_addr_t addr,
> + resource_size_t size, unsigned long *port);
> unsigned long pci_address_to_pio(phys_addr_t addr);
> phys_addr_t pci_pio_to_address(unsigned long pio);
> int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
> --
> 1.9.1
>
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