diff options
Diffstat (limited to 'drivers/pci/endpoint/pci-epc-mem.c')
| -rw-r--r-- | drivers/pci/endpoint/pci-epc-mem.c | 204 |
1 files changed, 144 insertions, 60 deletions
diff --git a/drivers/pci/endpoint/pci-epc-mem.c b/drivers/pci/endpoint/pci-epc-mem.c index abfac1109a13..80c46f3a4590 100644 --- a/drivers/pci/endpoint/pci-epc-mem.c +++ b/drivers/pci/endpoint/pci-epc-mem.c @@ -23,7 +23,7 @@ static int pci_epc_mem_get_order(struct pci_epc_mem *mem, size_t size) { int order; - unsigned int page_shift = ilog2(mem->page_size); + unsigned int page_shift = ilog2(mem->window.page_size); size--; size >>= page_shift; @@ -36,62 +36,97 @@ static int pci_epc_mem_get_order(struct pci_epc_mem *mem, size_t size) } /** - * __pci_epc_mem_init() - initialize the pci_epc_mem structure + * pci_epc_multi_mem_init() - initialize the pci_epc_mem structure * @epc: the EPC device that invoked pci_epc_mem_init - * @phys_base: the physical address of the base - * @size: the size of the address space - * @page_size: size of each page + * @windows: pointer to windows supported by the device + * @num_windows: number of windows device supports * * Invoke to initialize the pci_epc_mem structure used by the * endpoint functions to allocate mapped PCI address. */ -int __pci_epc_mem_init(struct pci_epc *epc, phys_addr_t phys_base, size_t size, - size_t page_size) +int pci_epc_multi_mem_init(struct pci_epc *epc, + struct pci_epc_mem_window *windows, + unsigned int num_windows) { - int ret; - struct pci_epc_mem *mem; - unsigned long *bitmap; + struct pci_epc_mem *mem = NULL; + unsigned long *bitmap = NULL; unsigned int page_shift; - int pages; + size_t page_size; int bitmap_size; + int pages; + int ret; + int i; - if (page_size < PAGE_SIZE) - page_size = PAGE_SIZE; + epc->num_windows = 0; - page_shift = ilog2(page_size); - pages = size >> page_shift; - bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); + if (!windows || !num_windows) + return -EINVAL; - mem = kzalloc(sizeof(*mem), GFP_KERNEL); - if (!mem) { - ret = -ENOMEM; - goto err; - } + epc->windows = kcalloc(num_windows, sizeof(*epc->windows), GFP_KERNEL); + if (!epc->windows) + return -ENOMEM; - bitmap = kzalloc(bitmap_size, GFP_KERNEL); - if (!bitmap) { - ret = -ENOMEM; - goto err_mem; - } + for (i = 0; i < num_windows; i++) { + page_size = windows[i].page_size; + if (page_size < PAGE_SIZE) + page_size = PAGE_SIZE; + page_shift = ilog2(page_size); + pages = windows[i].size >> page_shift; + bitmap_size = BITS_TO_LONGS(pages) * sizeof(long); - mem->bitmap = bitmap; - mem->phys_base = phys_base; - mem->page_size = page_size; - mem->pages = pages; - mem->size = size; - mutex_init(&mem->lock); + mem = kzalloc(sizeof(*mem), GFP_KERNEL); + if (!mem) { + ret = -ENOMEM; + i--; + goto err_mem; + } + + bitmap = kzalloc(bitmap_size, GFP_KERNEL); + if (!bitmap) { + ret = -ENOMEM; + kfree(mem); + i--; + goto err_mem; + } + + mem->window.phys_base = windows[i].phys_base; + mem->window.size = windows[i].size; + mem->window.page_size = page_size; + mem->bitmap = bitmap; + mem->pages = pages; + mutex_init(&mem->lock); + epc->windows[i] = mem; + } - epc->mem = mem; + epc->mem = epc->windows[0]; + epc->num_windows = num_windows; return 0; err_mem: - kfree(mem); + for (; i >= 0; i--) { + mem = epc->windows[i]; + kfree(mem->bitmap); + kfree(mem); + } + kfree(epc->windows); + + return ret; +} +EXPORT_SYMBOL_GPL(pci_epc_multi_mem_init); + +int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base, + size_t size, size_t page_size) +{ + struct pci_epc_mem_window mem_window; + + mem_window.phys_base = base; + mem_window.size = size; + mem_window.page_size = page_size; -err: -return ret; + return pci_epc_multi_mem_init(epc, &mem_window, 1); } -EXPORT_SYMBOL_GPL(__pci_epc_mem_init); +EXPORT_SYMBOL_GPL(pci_epc_mem_init); /** * pci_epc_mem_exit() - cleanup the pci_epc_mem structure @@ -102,11 +137,22 @@ EXPORT_SYMBOL_GPL(__pci_epc_mem_init); */ void pci_epc_mem_exit(struct pci_epc *epc) { - struct pci_epc_mem *mem = epc->mem; + struct pci_epc_mem *mem; + int i; + + if (!epc->num_windows) + return; + for (i = 0; i < epc->num_windows; i++) { + mem = epc->windows[i]; + kfree(mem->bitmap); + kfree(mem); + } + kfree(epc->windows); + + epc->windows = NULL; epc->mem = NULL; - kfree(mem->bitmap); - kfree(mem); + epc->num_windows = 0; } EXPORT_SYMBOL_GPL(pci_epc_mem_exit); @@ -122,31 +168,60 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_exit); void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc, phys_addr_t *phys_addr, size_t size) { - int pageno; void __iomem *virt_addr = NULL; - struct pci_epc_mem *mem = epc->mem; - unsigned int page_shift = ilog2(mem->page_size); + struct pci_epc_mem *mem; + unsigned int page_shift; + size_t align_size; + int pageno; int order; + int i; - size = ALIGN(size, mem->page_size); - order = pci_epc_mem_get_order(mem, size); - - mutex_lock(&mem->lock); - pageno = bitmap_find_free_region(mem->bitmap, mem->pages, order); - if (pageno < 0) - goto ret; + for (i = 0; i < epc->num_windows; i++) { + mem = epc->windows[i]; + mutex_lock(&mem->lock); + align_size = ALIGN(size, mem->window.page_size); + order = pci_epc_mem_get_order(mem, align_size); - *phys_addr = mem->phys_base + ((phys_addr_t)pageno << page_shift); - virt_addr = ioremap(*phys_addr, size); - if (!virt_addr) - bitmap_release_region(mem->bitmap, pageno, order); + pageno = bitmap_find_free_region(mem->bitmap, mem->pages, + order); + if (pageno >= 0) { + page_shift = ilog2(mem->window.page_size); + *phys_addr = mem->window.phys_base + + ((phys_addr_t)pageno << page_shift); + virt_addr = ioremap(*phys_addr, align_size); + if (!virt_addr) { + bitmap_release_region(mem->bitmap, + pageno, order); + mutex_unlock(&mem->lock); + continue; + } + mutex_unlock(&mem->lock); + return virt_addr; + } + mutex_unlock(&mem->lock); + } -ret: - mutex_unlock(&mem->lock); return virt_addr; } EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr); +static struct pci_epc_mem *pci_epc_get_matching_window(struct pci_epc *epc, + phys_addr_t phys_addr) +{ + struct pci_epc_mem *mem; + int i; + + for (i = 0; i < epc->num_windows; i++) { + mem = epc->windows[i]; + + if (phys_addr >= mem->window.phys_base && + phys_addr < (mem->window.phys_base + mem->window.size)) + return mem; + } + + return NULL; +} + /** * pci_epc_mem_free_addr() - free the allocated memory address * @epc: the EPC device on which memory was allocated @@ -159,14 +234,23 @@ EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr); void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr, void __iomem *virt_addr, size_t size) { + struct pci_epc_mem *mem; + unsigned int page_shift; + size_t page_size; int pageno; - struct pci_epc_mem *mem = epc->mem; - unsigned int page_shift = ilog2(mem->page_size); int order; + mem = pci_epc_get_matching_window(epc, phys_addr); + if (!mem) { + pr_err("failed to get matching window\n"); + return; + } + + page_size = mem->window.page_size; + page_shift = ilog2(page_size); iounmap(virt_addr); - pageno = (phys_addr - mem->phys_base) >> page_shift; - size = ALIGN(size, mem->page_size); + pageno = (phys_addr - mem->window.phys_base) >> page_shift; + size = ALIGN(size, page_size); order = pci_epc_mem_get_order(mem, size); mutex_lock(&mem->lock); bitmap_release_region(mem->bitmap, pageno, order); |