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PCI: endpoint: Improve pci_epc_mem_alloc_addr()

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There is no point in attempting to allocate memory from an endpoint
controller memory window if the requested size is larger than the memory
window size. Add a check to skip bitmap_find_free_region() calls for
such case. This check can be done without the mem->lock mutex held as
memory window sizes are constant and never modified at runtime.
Also change the final return to return NULL to simplify the code.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Niklas Cassel <cassel@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20241012113246.95634-3-dlemoal@kernel.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Damien Le Moal
2024-10-12 20:32:42 +09:00
committed by Manivannan Sadhasivam
parent ca3c342fb3
commit 2314c6ffe8
1 changed files with 6 additions and 3 deletions
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9
drivers/pci/endpoint/pci-epc-mem.c
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@@ -178,7 +178,7 @@ 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)
{
void __iomem *virt_addr = NULL;
void __iomem *virt_addr;
struct pci_epc_mem *mem;
unsigned int page_shift;
size_t align_size;
@@ -188,10 +188,13 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
for (i = 0; i < epc->num_windows; i++) {
mem = epc->windows[i];
mutex_lock(&mem->lock);
if (size > mem->window.size)
continue;
align_size = ALIGN(size, mem->window.page_size);
order = pci_epc_mem_get_order(mem, align_size);
mutex_lock(&mem->lock);
pageno = bitmap_find_free_region(mem->bitmap, mem->pages,
order);
if (pageno >= 0) {
@@ -211,7 +214,7 @@ void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
mutex_unlock(&mem->lock);
}
return virt_addr;
return NULL;
}
EXPORT_SYMBOL_GPL(pci_epc_mem_alloc_addr);