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SubjectRe: [PATCH v13 4/9] PCI: Apply the new generic I/O management on PCI IO hosts
On Wed, Feb 14, 2018 at 01:45:28AM +0800, John Garry wrote:
> From: Zhichang Yuan <yuanzhichang@hisilicon.com>
>
> After introducing the new generic I/O space management in logic pio, the
> original PCI MMIO relevant helpers need to be updated based on the new
> interfaces.
> This patch adapts the corresponding code to match the changes introduced
> by logic pio.
>
> Signed-off-by: Zhichang Yuan <yuanzhichang@hisilicon.com>
> Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de> #earlier draft
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>

I saw that Bjorn Acked this back in v6, but it seems like the code in
pci.c was reworked a bit for v7 onwards and I didn't see a follow-up
review (apologies if I just missed it). In which case, maybe his Ack
should have the "#earlier draft" tag as well?

> ---
> drivers/pci/pci.c | 95 +++++++++---------------------------------------
> include/asm-generic/io.h | 2 +-
> 2 files changed, 18 insertions(+), 79 deletions(-)
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index 07290a3..8aa5c54 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -22,6 +22,7 @@
> #include <linux/spinlock.h>
> #include <linux/string.h>
> #include <linux/log2.h>
> +#include <linux/logic_pio.h>
> #include <linux/pci-aspm.h>
> #include <linux/pm_wakeup.h>
> #include <linux/interrupt.h>
> @@ -3440,17 +3441,6 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
> }
> EXPORT_SYMBOL(pci_request_regions_exclusive);
>
> -#ifdef PCI_IOBASE
> -struct io_range {
> - struct list_head list;
> - phys_addr_t start;
> - resource_size_t size;
> -};
> -
> -static LIST_HEAD(io_range_list);
> -static DEFINE_SPINLOCK(io_range_lock);
> -#endif
> -
> /*
> * Record the PCI IO range (expressed as CPU physical address + size).
> * Return a negative value if an error has occured, zero otherwise
> @@ -3458,51 +3448,28 @@ struct io_range {
> int pci_register_io_range(struct fwnode_handle *fwnode, phys_addr_t addr,
> resource_size_t size)
> {
> - int err = 0;
> -
> + int ret = 0;
> #ifdef PCI_IOBASE
> - struct io_range *range;
> - resource_size_t allocated_size = 0;
> -
> - /* 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) {
> - /* range already registered, bail out */
> - goto end_register;
> - }
> - allocated_size += range->size;
> - }
> + struct logic_pio_hwaddr *range;
>
> - /* range not registed yet, check for available space */
> - if (allocated_size + size - 1 > IO_SPACE_LIMIT) {
> - /* if it's too big check if 64K space can be reserved */
> - if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) {
> - err = -E2BIG;
> - goto end_register;
> - }
> -
> - size = SZ_64K;
> - pr_warn("Requested IO range too big, new size set to 64K\n");
> - }
> + if (!size || addr + size < addr)
> + return -EINVAL;
>
> - /* add the range to the list */
> range = kzalloc(sizeof(*range), GFP_ATOMIC);
> - if (!range) {
> - err = -ENOMEM;
> - goto end_register;
> - }
> + if (!range)
> + return -ENOMEM;
>
> - range->start = addr;
> + range->fwnode = fwnode;
> range->size = size;
> + range->hw_start = addr;
> + range->flags = PIO_CPU_MMIO;
>
> - list_add_tail(&range->list, &io_range_list);
> -
> -end_register:
> - spin_unlock(&io_range_lock);
> + ret = logic_pio_register_range(range);
> + if (ret)
> + kfree(range);
> #endif
>
> - return err;
> + return ret;
> }
>
> phys_addr_t pci_pio_to_address(unsigned long pio)
> @@ -3510,21 +3477,10 @@ phys_addr_t pci_pio_to_address(unsigned long pio)
> phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
>
> #ifdef PCI_IOBASE
> - struct io_range *range;
> - resource_size_t allocated_size = 0;
> -
> - if (pio > IO_SPACE_LIMIT)
> + if (pio >= MMIO_UPPER_LIMIT)
> return address;
>
> - spin_lock(&io_range_lock);
> - list_for_each_entry(range, &io_range_list, list) {
> - if (pio >= allocated_size && pio < allocated_size + range->size) {
> - address = range->start + pio - allocated_size;
> - break;
> - }
> - allocated_size += range->size;
> - }
> - spin_unlock(&io_range_lock);
> + address = logic_pio_to_hwaddr(pio);
> #endif
>
> return address;
> @@ -3533,25 +3489,8 @@ phys_addr_t pci_pio_to_address(unsigned long pio)
> unsigned long __weak pci_address_to_pio(phys_addr_t address)
> {
> #ifdef PCI_IOBASE
> - struct io_range *res;
> - resource_size_t offset = 0;
> - unsigned long addr = -1;
> -
> - spin_lock(&io_range_lock);
> - list_for_each_entry(res, &io_range_list, list) {
> - if (address >= res->start && address < res->start + res->size) {
> - addr = address - res->start + offset;
> - break;
> - }
> - offset += res->size;
> - }
> - spin_unlock(&io_range_lock);
> -
> - return addr;
> + return logic_pio_trans_cpuaddr(address);
> #else
> - if (address > IO_SPACE_LIMIT)
> - return (unsigned long)-1;
> -

Why is this check now safe to drop in the !PCI_IOBASE case?

-dann

> return (unsigned long) address;
> #endif
> }
> diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
> index b7996a79..5a59931 100644
> --- a/include/asm-generic/io.h
> +++ b/include/asm-generic/io.h
> @@ -901,7 +901,7 @@ static inline void iounmap(void __iomem *addr)
> #define ioport_map ioport_map
> static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
> {
> - return PCI_IOBASE + (port & IO_SPACE_LIMIT);
> + return PCI_IOBASE + (port & MMIO_UPPER_LIMIT);
> }
> #endif
>

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