Re: [PATCH V6 2/5] PCI: Adapt pci_register_io_range() for indirect-IO and PCI I/O translation

From: Rafael J. Wysocki
Date: Thu Feb 02 2017 - 18:00:28 EST

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On Thu, Feb 2, 2017 at 6:36 PM, John Garry <john.garry@xxxxxxxxxx> wrote:
> Hi Rafael,
>
> Could you kindly check the minor changes to drivers/acpi/pci_root.c? It
> would also be appreciated if you could review the ACPI-relevant parts in
> lib/extio.c, in [PATCH V5 5/5] LPC: Add the ACPI LPC support

If you want patches to be reviewed from the ACPI perspective, please
CC them to linux-acpi. I'm not the only person who may be interested
in them.

The change is pci_root.c looks OK to me, but it's Bjorn's call anyway.

Thanks,
Rafael

> On 24/01/2017 07:05, 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@xxxxxxxxxxxxx>
>> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@xxxxxxxxxx>
>> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
>> ---
>> 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);
>>
>
>

Next message: Junio C Hamano: "[ANNOUNCE] Git v2.11.1"
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In reply to: John Garry: "Re: [PATCH V6 2/5] PCI: Adapt pci_register_io_range() for indirect-IO and PCI I/O translation"
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