| ats.c (2a267e7c41aa88215de2b542de797d03d16ecdfd) | ats.c (f6b6aefee70aa5261deec7feab80c249bf58397f) |
|---|---|
| 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * PCI Express I/O Virtualization (IOV) support 4 * Address Translation Service 1.0 5 * Page Request Interface added by Joerg Roedel <joerg.roedel@amd.com> 6 * PASID support added by Joerg Roedel <joerg.roedel@amd.com> 7 * 8 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com> --- 418 unchanged lines hidden (view full) --- 427 428#define PASID_NUMBER_SHIFT 8 429#define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT) 430/** 431 * pci_max_pasid - Get maximum number of PASIDs supported by device 432 * @pdev: PCI device structure 433 * 434 * Returns negative value when PASID capability is not present. | 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * PCI Express I/O Virtualization (IOV) support 4 * Address Translation Service 1.0 5 * Page Request Interface added by Joerg Roedel <joerg.roedel@amd.com> 6 * PASID support added by Joerg Roedel <joerg.roedel@amd.com> 7 * 8 * Copyright (C) 2009 Intel Corporation, Yu Zhao <yu.zhao@intel.com> --- 418 unchanged lines hidden (view full) --- 427 428#define PASID_NUMBER_SHIFT 8 429#define PASID_NUMBER_MASK (0x1f << PASID_NUMBER_SHIFT) 430/** 431 * pci_max_pasid - Get maximum number of PASIDs supported by device 432 * @pdev: PCI device structure 433 * 434 * Returns negative value when PASID capability is not present. |
| 435 * Otherwise it returns the numer of supported PASIDs. | 435 * Otherwise it returns the number of supported PASIDs. |
| 436 */ 437int pci_max_pasids(struct pci_dev *pdev) 438{ 439 u16 supported; 440 int pos; 441 442 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); 443 if (!pos) 444 return -EINVAL; 445 446 pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); 447 448 supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT; 449 450 return (1 << supported); 451} 452EXPORT_SYMBOL_GPL(pci_max_pasids); 453#endif /* CONFIG_PCI_PASID */ | 436 */ 437int pci_max_pasids(struct pci_dev *pdev) 438{ 439 u16 supported; 440 int pos; 441 442 pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PASID); 443 if (!pos) 444 return -EINVAL; 445 446 pci_read_config_word(pdev, pos + PCI_PASID_CAP, &supported); 447 448 supported = (supported & PASID_NUMBER_MASK) >> PASID_NUMBER_SHIFT; 449 450 return (1 << supported); 451} 452EXPORT_SYMBOL_GPL(pci_max_pasids); 453#endif /* CONFIG_PCI_PASID */ |