1695093e3SVarun Sethi /* 2695093e3SVarun Sethi * This program is free software; you can redistribute it and/or modify 3695093e3SVarun Sethi * it under the terms of the GNU General Public License, version 2, as 4695093e3SVarun Sethi * published by the Free Software Foundation. 5695093e3SVarun Sethi * 6695093e3SVarun Sethi * This program is distributed in the hope that it will be useful, 7695093e3SVarun Sethi * but WITHOUT ANY WARRANTY; without even the implied warranty of 8695093e3SVarun Sethi * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 9695093e3SVarun Sethi * GNU General Public License for more details. 10695093e3SVarun Sethi * 11695093e3SVarun Sethi * You should have received a copy of the GNU General Public License 12695093e3SVarun Sethi * along with this program; if not, write to the Free Software 13695093e3SVarun Sethi * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 14695093e3SVarun Sethi * 15695093e3SVarun Sethi * Copyright (C) 2013 Freescale Semiconductor, Inc. 16695093e3SVarun Sethi * Author: Varun Sethi <varun.sethi@freescale.com> 17695093e3SVarun Sethi * 18695093e3SVarun Sethi */ 19695093e3SVarun Sethi 20695093e3SVarun Sethi #define pr_fmt(fmt) "fsl-pamu-domain: %s: " fmt, __func__ 21695093e3SVarun Sethi 22695093e3SVarun Sethi #include <linux/init.h> 23695093e3SVarun Sethi #include <linux/iommu.h> 24695093e3SVarun Sethi #include <linux/notifier.h> 25695093e3SVarun Sethi #include <linux/slab.h> 26695093e3SVarun Sethi #include <linux/module.h> 27695093e3SVarun Sethi #include <linux/types.h> 28695093e3SVarun Sethi #include <linux/mm.h> 29695093e3SVarun Sethi #include <linux/interrupt.h> 30695093e3SVarun Sethi #include <linux/device.h> 31695093e3SVarun Sethi #include <linux/of_platform.h> 32695093e3SVarun Sethi #include <linux/bootmem.h> 33695093e3SVarun Sethi #include <linux/err.h> 34695093e3SVarun Sethi #include <asm/io.h> 35695093e3SVarun Sethi #include <asm/bitops.h> 36695093e3SVarun Sethi 37695093e3SVarun Sethi #include <asm/pci-bridge.h> 38695093e3SVarun Sethi #include <sysdev/fsl_pci.h> 39695093e3SVarun Sethi 40695093e3SVarun Sethi #include "fsl_pamu_domain.h" 41695093e3SVarun Sethi 42695093e3SVarun Sethi /* 43695093e3SVarun Sethi * Global spinlock that needs to be held while 44695093e3SVarun Sethi * configuring PAMU. 45695093e3SVarun Sethi */ 46695093e3SVarun Sethi static DEFINE_SPINLOCK(iommu_lock); 47695093e3SVarun Sethi 48695093e3SVarun Sethi static struct kmem_cache *fsl_pamu_domain_cache; 49695093e3SVarun Sethi static struct kmem_cache *iommu_devinfo_cache; 50695093e3SVarun Sethi static DEFINE_SPINLOCK(device_domain_lock); 51695093e3SVarun Sethi 52695093e3SVarun Sethi static int __init iommu_init_mempool(void) 53695093e3SVarun Sethi { 54695093e3SVarun Sethi 55695093e3SVarun Sethi fsl_pamu_domain_cache = kmem_cache_create("fsl_pamu_domain", 56695093e3SVarun Sethi sizeof(struct fsl_dma_domain), 57695093e3SVarun Sethi 0, 58695093e3SVarun Sethi SLAB_HWCACHE_ALIGN, 59695093e3SVarun Sethi 60695093e3SVarun Sethi NULL); 61695093e3SVarun Sethi if (!fsl_pamu_domain_cache) { 62695093e3SVarun Sethi pr_debug("Couldn't create fsl iommu_domain cache\n"); 63695093e3SVarun Sethi return -ENOMEM; 64695093e3SVarun Sethi } 65695093e3SVarun Sethi 66695093e3SVarun Sethi iommu_devinfo_cache = kmem_cache_create("iommu_devinfo", 67695093e3SVarun Sethi sizeof(struct device_domain_info), 68695093e3SVarun Sethi 0, 69695093e3SVarun Sethi SLAB_HWCACHE_ALIGN, 70695093e3SVarun Sethi NULL); 71695093e3SVarun Sethi if (!iommu_devinfo_cache) { 72695093e3SVarun Sethi pr_debug("Couldn't create devinfo cache\n"); 73695093e3SVarun Sethi kmem_cache_destroy(fsl_pamu_domain_cache); 74695093e3SVarun Sethi return -ENOMEM; 75695093e3SVarun Sethi } 76695093e3SVarun Sethi 77695093e3SVarun Sethi return 0; 78695093e3SVarun Sethi } 79695093e3SVarun Sethi 80695093e3SVarun Sethi static phys_addr_t get_phys_addr(struct fsl_dma_domain *dma_domain, dma_addr_t iova) 81695093e3SVarun Sethi { 82695093e3SVarun Sethi u32 win_cnt = dma_domain->win_cnt; 83695093e3SVarun Sethi struct dma_window *win_ptr = 84695093e3SVarun Sethi &dma_domain->win_arr[0]; 85695093e3SVarun Sethi struct iommu_domain_geometry *geom; 86695093e3SVarun Sethi 87695093e3SVarun Sethi geom = &dma_domain->iommu_domain->geometry; 88695093e3SVarun Sethi 89695093e3SVarun Sethi if (!win_cnt || !dma_domain->geom_size) { 90695093e3SVarun Sethi pr_debug("Number of windows/geometry not configured for the domain\n"); 91695093e3SVarun Sethi return 0; 92695093e3SVarun Sethi } 93695093e3SVarun Sethi 94695093e3SVarun Sethi if (win_cnt > 1) { 95695093e3SVarun Sethi u64 subwin_size; 96695093e3SVarun Sethi dma_addr_t subwin_iova; 97695093e3SVarun Sethi u32 wnd; 98695093e3SVarun Sethi 99695093e3SVarun Sethi subwin_size = dma_domain->geom_size >> ilog2(win_cnt); 100695093e3SVarun Sethi subwin_iova = iova & ~(subwin_size - 1); 101695093e3SVarun Sethi wnd = (subwin_iova - geom->aperture_start) >> ilog2(subwin_size); 102695093e3SVarun Sethi win_ptr = &dma_domain->win_arr[wnd]; 103695093e3SVarun Sethi } 104695093e3SVarun Sethi 105695093e3SVarun Sethi if (win_ptr->valid) 106695093e3SVarun Sethi return (win_ptr->paddr + (iova & (win_ptr->size - 1))); 107695093e3SVarun Sethi 108695093e3SVarun Sethi return 0; 109695093e3SVarun Sethi } 110695093e3SVarun Sethi 111695093e3SVarun Sethi static int map_subwins(int liodn, struct fsl_dma_domain *dma_domain) 112695093e3SVarun Sethi { 113695093e3SVarun Sethi struct dma_window *sub_win_ptr = 114695093e3SVarun Sethi &dma_domain->win_arr[0]; 115695093e3SVarun Sethi int i, ret; 116695093e3SVarun Sethi unsigned long rpn, flags; 117695093e3SVarun Sethi 118695093e3SVarun Sethi for (i = 0; i < dma_domain->win_cnt; i++) { 119695093e3SVarun Sethi if (sub_win_ptr[i].valid) { 120695093e3SVarun Sethi rpn = sub_win_ptr[i].paddr >> 121695093e3SVarun Sethi PAMU_PAGE_SHIFT; 122695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 123695093e3SVarun Sethi ret = pamu_config_spaace(liodn, dma_domain->win_cnt, i, 124695093e3SVarun Sethi sub_win_ptr[i].size, 125695093e3SVarun Sethi ~(u32)0, 126695093e3SVarun Sethi rpn, 127695093e3SVarun Sethi dma_domain->snoop_id, 128695093e3SVarun Sethi dma_domain->stash_id, 129695093e3SVarun Sethi (i > 0) ? 1 : 0, 130695093e3SVarun Sethi sub_win_ptr[i].prot); 131695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 132695093e3SVarun Sethi if (ret) { 133695093e3SVarun Sethi pr_debug("PAMU SPAACE configuration failed for liodn %d\n", 134695093e3SVarun Sethi liodn); 135695093e3SVarun Sethi return ret; 136695093e3SVarun Sethi } 137695093e3SVarun Sethi } 138695093e3SVarun Sethi } 139695093e3SVarun Sethi 140695093e3SVarun Sethi return ret; 141695093e3SVarun Sethi } 142695093e3SVarun Sethi 143695093e3SVarun Sethi static int map_win(int liodn, struct fsl_dma_domain *dma_domain) 144695093e3SVarun Sethi { 145695093e3SVarun Sethi int ret; 146695093e3SVarun Sethi struct dma_window *wnd = &dma_domain->win_arr[0]; 147695093e3SVarun Sethi phys_addr_t wnd_addr = dma_domain->iommu_domain->geometry.aperture_start; 148695093e3SVarun Sethi unsigned long flags; 149695093e3SVarun Sethi 150695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 151695093e3SVarun Sethi ret = pamu_config_ppaace(liodn, wnd_addr, 152695093e3SVarun Sethi wnd->size, 153695093e3SVarun Sethi ~(u32)0, 154695093e3SVarun Sethi wnd->paddr >> PAMU_PAGE_SHIFT, 155695093e3SVarun Sethi dma_domain->snoop_id, dma_domain->stash_id, 156695093e3SVarun Sethi 0, wnd->prot); 157695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 158695093e3SVarun Sethi if (ret) 159695093e3SVarun Sethi pr_debug("PAMU PAACE configuration failed for liodn %d\n", 160695093e3SVarun Sethi liodn); 161695093e3SVarun Sethi 162695093e3SVarun Sethi return ret; 163695093e3SVarun Sethi } 164695093e3SVarun Sethi 165695093e3SVarun Sethi /* Map the DMA window corresponding to the LIODN */ 166695093e3SVarun Sethi static int map_liodn(int liodn, struct fsl_dma_domain *dma_domain) 167695093e3SVarun Sethi { 168695093e3SVarun Sethi if (dma_domain->win_cnt > 1) 169695093e3SVarun Sethi return map_subwins(liodn, dma_domain); 170695093e3SVarun Sethi else 171695093e3SVarun Sethi return map_win(liodn, dma_domain); 172695093e3SVarun Sethi 173695093e3SVarun Sethi } 174695093e3SVarun Sethi 175695093e3SVarun Sethi /* Update window/subwindow mapping for the LIODN */ 176695093e3SVarun Sethi static int update_liodn(int liodn, struct fsl_dma_domain *dma_domain, u32 wnd_nr) 177695093e3SVarun Sethi { 178695093e3SVarun Sethi int ret; 179695093e3SVarun Sethi struct dma_window *wnd = &dma_domain->win_arr[wnd_nr]; 180695093e3SVarun Sethi unsigned long flags; 181695093e3SVarun Sethi 182695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 183695093e3SVarun Sethi if (dma_domain->win_cnt > 1) { 184695093e3SVarun Sethi ret = pamu_config_spaace(liodn, dma_domain->win_cnt, wnd_nr, 185695093e3SVarun Sethi wnd->size, 186695093e3SVarun Sethi ~(u32)0, 187695093e3SVarun Sethi wnd->paddr >> PAMU_PAGE_SHIFT, 188695093e3SVarun Sethi dma_domain->snoop_id, 189695093e3SVarun Sethi dma_domain->stash_id, 190695093e3SVarun Sethi (wnd_nr > 0) ? 1 : 0, 191695093e3SVarun Sethi wnd->prot); 192695093e3SVarun Sethi if (ret) 193695093e3SVarun Sethi pr_debug("Subwindow reconfiguration failed for liodn %d\n", liodn); 194695093e3SVarun Sethi } else { 195695093e3SVarun Sethi phys_addr_t wnd_addr; 196695093e3SVarun Sethi 197695093e3SVarun Sethi wnd_addr = dma_domain->iommu_domain->geometry.aperture_start; 198695093e3SVarun Sethi 199695093e3SVarun Sethi ret = pamu_config_ppaace(liodn, wnd_addr, 200695093e3SVarun Sethi wnd->size, 201695093e3SVarun Sethi ~(u32)0, 202695093e3SVarun Sethi wnd->paddr >> PAMU_PAGE_SHIFT, 203695093e3SVarun Sethi dma_domain->snoop_id, dma_domain->stash_id, 204695093e3SVarun Sethi 0, wnd->prot); 205695093e3SVarun Sethi if (ret) 206695093e3SVarun Sethi pr_debug("Window reconfiguration failed for liodn %d\n", liodn); 207695093e3SVarun Sethi } 208695093e3SVarun Sethi 209695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 210695093e3SVarun Sethi 211695093e3SVarun Sethi return ret; 212695093e3SVarun Sethi } 213695093e3SVarun Sethi 214695093e3SVarun Sethi static int update_liodn_stash(int liodn, struct fsl_dma_domain *dma_domain, 215695093e3SVarun Sethi u32 val) 216695093e3SVarun Sethi { 217695093e3SVarun Sethi int ret = 0, i; 218695093e3SVarun Sethi unsigned long flags; 219695093e3SVarun Sethi 220695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 221695093e3SVarun Sethi if (!dma_domain->win_arr) { 222695093e3SVarun Sethi pr_debug("Windows not configured, stash destination update failed for liodn %d\n", liodn); 223695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 224695093e3SVarun Sethi return -EINVAL; 225695093e3SVarun Sethi } 226695093e3SVarun Sethi 227695093e3SVarun Sethi for (i = 0; i < dma_domain->win_cnt; i++) { 228695093e3SVarun Sethi ret = pamu_update_paace_stash(liodn, i, val); 229695093e3SVarun Sethi if (ret) { 230695093e3SVarun Sethi pr_debug("Failed to update SPAACE %d field for liodn %d\n ", i, liodn); 231695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 232695093e3SVarun Sethi return ret; 233695093e3SVarun Sethi } 234695093e3SVarun Sethi } 235695093e3SVarun Sethi 236695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 237695093e3SVarun Sethi 238695093e3SVarun Sethi return ret; 239695093e3SVarun Sethi } 240695093e3SVarun Sethi 241695093e3SVarun Sethi /* Set the geometry parameters for a LIODN */ 242695093e3SVarun Sethi static int pamu_set_liodn(int liodn, struct device *dev, 243695093e3SVarun Sethi struct fsl_dma_domain *dma_domain, 244695093e3SVarun Sethi struct iommu_domain_geometry *geom_attr, 245695093e3SVarun Sethi u32 win_cnt) 246695093e3SVarun Sethi { 247695093e3SVarun Sethi phys_addr_t window_addr, window_size; 248695093e3SVarun Sethi phys_addr_t subwin_size; 249695093e3SVarun Sethi int ret = 0, i; 250695093e3SVarun Sethi u32 omi_index = ~(u32)0; 251695093e3SVarun Sethi unsigned long flags; 252695093e3SVarun Sethi 253695093e3SVarun Sethi /* 254695093e3SVarun Sethi * Configure the omi_index at the geometry setup time. 255695093e3SVarun Sethi * This is a static value which depends on the type of 256695093e3SVarun Sethi * device and would not change thereafter. 257695093e3SVarun Sethi */ 258695093e3SVarun Sethi get_ome_index(&omi_index, dev); 259695093e3SVarun Sethi 260695093e3SVarun Sethi window_addr = geom_attr->aperture_start; 261695093e3SVarun Sethi window_size = dma_domain->geom_size; 262695093e3SVarun Sethi 263695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 264695093e3SVarun Sethi ret = pamu_disable_liodn(liodn); 265695093e3SVarun Sethi if (!ret) 266695093e3SVarun Sethi ret = pamu_config_ppaace(liodn, window_addr, window_size, omi_index, 267695093e3SVarun Sethi 0, dma_domain->snoop_id, 268695093e3SVarun Sethi dma_domain->stash_id, win_cnt, 0); 269695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 270695093e3SVarun Sethi if (ret) { 271695093e3SVarun Sethi pr_debug("PAMU PAACE configuration failed for liodn %d, win_cnt =%d\n", liodn, win_cnt); 272695093e3SVarun Sethi return ret; 273695093e3SVarun Sethi } 274695093e3SVarun Sethi 275695093e3SVarun Sethi if (win_cnt > 1) { 276695093e3SVarun Sethi subwin_size = window_size >> ilog2(win_cnt); 277695093e3SVarun Sethi for (i = 0; i < win_cnt; i++) { 278695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 279695093e3SVarun Sethi ret = pamu_disable_spaace(liodn, i); 280695093e3SVarun Sethi if (!ret) 281695093e3SVarun Sethi ret = pamu_config_spaace(liodn, win_cnt, i, 282695093e3SVarun Sethi subwin_size, omi_index, 283695093e3SVarun Sethi 0, dma_domain->snoop_id, 284695093e3SVarun Sethi dma_domain->stash_id, 285695093e3SVarun Sethi 0, 0); 286695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 287695093e3SVarun Sethi if (ret) { 288695093e3SVarun Sethi pr_debug("PAMU SPAACE configuration failed for liodn %d\n", liodn); 289695093e3SVarun Sethi return ret; 290695093e3SVarun Sethi } 291695093e3SVarun Sethi } 292695093e3SVarun Sethi } 293695093e3SVarun Sethi 294695093e3SVarun Sethi return ret; 295695093e3SVarun Sethi } 296695093e3SVarun Sethi 297695093e3SVarun Sethi static int check_size(u64 size, dma_addr_t iova) 298695093e3SVarun Sethi { 299695093e3SVarun Sethi /* 300695093e3SVarun Sethi * Size must be a power of two and at least be equal 301695093e3SVarun Sethi * to PAMU page size. 302695093e3SVarun Sethi */ 303695093e3SVarun Sethi if (!is_power_of_2(size) || size < PAMU_PAGE_SIZE) { 304695093e3SVarun Sethi pr_debug("%s: size too small or not a power of two\n", __func__); 305695093e3SVarun Sethi return -EINVAL; 306695093e3SVarun Sethi } 307695093e3SVarun Sethi 308695093e3SVarun Sethi /* iova must be page size aligned*/ 309695093e3SVarun Sethi if (iova & (size - 1)) { 310695093e3SVarun Sethi pr_debug("%s: address is not aligned with window size\n", __func__); 311695093e3SVarun Sethi return -EINVAL; 312695093e3SVarun Sethi } 313695093e3SVarun Sethi 314695093e3SVarun Sethi return 0; 315695093e3SVarun Sethi } 316695093e3SVarun Sethi 317695093e3SVarun Sethi static struct fsl_dma_domain *iommu_alloc_dma_domain(void) 318695093e3SVarun Sethi { 319695093e3SVarun Sethi struct fsl_dma_domain *domain; 320695093e3SVarun Sethi 321695093e3SVarun Sethi domain = kmem_cache_zalloc(fsl_pamu_domain_cache, GFP_KERNEL); 322695093e3SVarun Sethi if (!domain) 323695093e3SVarun Sethi return NULL; 324695093e3SVarun Sethi 325695093e3SVarun Sethi domain->stash_id = ~(u32)0; 326695093e3SVarun Sethi domain->snoop_id = ~(u32)0; 327695093e3SVarun Sethi domain->win_cnt = pamu_get_max_subwin_cnt(); 328695093e3SVarun Sethi domain->geom_size = 0; 329695093e3SVarun Sethi 330695093e3SVarun Sethi INIT_LIST_HEAD(&domain->devices); 331695093e3SVarun Sethi 332695093e3SVarun Sethi spin_lock_init(&domain->domain_lock); 333695093e3SVarun Sethi 334695093e3SVarun Sethi return domain; 335695093e3SVarun Sethi } 336695093e3SVarun Sethi 337695093e3SVarun Sethi static inline struct device_domain_info *find_domain(struct device *dev) 338695093e3SVarun Sethi { 339695093e3SVarun Sethi return dev->archdata.iommu_domain; 340695093e3SVarun Sethi } 341695093e3SVarun Sethi 342695093e3SVarun Sethi static void remove_device_ref(struct device_domain_info *info, u32 win_cnt) 343695093e3SVarun Sethi { 344695093e3SVarun Sethi unsigned long flags; 345695093e3SVarun Sethi 346695093e3SVarun Sethi list_del(&info->link); 347695093e3SVarun Sethi spin_lock_irqsave(&iommu_lock, flags); 348695093e3SVarun Sethi if (win_cnt > 1) 349695093e3SVarun Sethi pamu_free_subwins(info->liodn); 350695093e3SVarun Sethi pamu_disable_liodn(info->liodn); 351695093e3SVarun Sethi spin_unlock_irqrestore(&iommu_lock, flags); 352695093e3SVarun Sethi spin_lock_irqsave(&device_domain_lock, flags); 353695093e3SVarun Sethi info->dev->archdata.iommu_domain = NULL; 354695093e3SVarun Sethi kmem_cache_free(iommu_devinfo_cache, info); 355695093e3SVarun Sethi spin_unlock_irqrestore(&device_domain_lock, flags); 356695093e3SVarun Sethi } 357695093e3SVarun Sethi 358695093e3SVarun Sethi static void detach_device(struct device *dev, struct fsl_dma_domain *dma_domain) 359695093e3SVarun Sethi { 360695093e3SVarun Sethi struct device_domain_info *info, *tmp; 361695093e3SVarun Sethi unsigned long flags; 362695093e3SVarun Sethi 363695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 364695093e3SVarun Sethi /* Remove the device from the domain device list */ 365695093e3SVarun Sethi list_for_each_entry_safe(info, tmp, &dma_domain->devices, link) { 366695093e3SVarun Sethi if (!dev || (info->dev == dev)) 367695093e3SVarun Sethi remove_device_ref(info, dma_domain->win_cnt); 368695093e3SVarun Sethi } 369695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 370695093e3SVarun Sethi } 371695093e3SVarun Sethi 372695093e3SVarun Sethi static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct device *dev) 373695093e3SVarun Sethi { 374695093e3SVarun Sethi struct device_domain_info *info, *old_domain_info; 375695093e3SVarun Sethi unsigned long flags; 376695093e3SVarun Sethi 377695093e3SVarun Sethi spin_lock_irqsave(&device_domain_lock, flags); 378695093e3SVarun Sethi /* 379695093e3SVarun Sethi * Check here if the device is already attached to domain or not. 380695093e3SVarun Sethi * If the device is already attached to a domain detach it. 381695093e3SVarun Sethi */ 382695093e3SVarun Sethi old_domain_info = find_domain(dev); 383695093e3SVarun Sethi if (old_domain_info && old_domain_info->domain != dma_domain) { 384695093e3SVarun Sethi spin_unlock_irqrestore(&device_domain_lock, flags); 385695093e3SVarun Sethi detach_device(dev, old_domain_info->domain); 386695093e3SVarun Sethi spin_lock_irqsave(&device_domain_lock, flags); 387695093e3SVarun Sethi } 388695093e3SVarun Sethi 389695093e3SVarun Sethi info = kmem_cache_zalloc(iommu_devinfo_cache, GFP_ATOMIC); 390695093e3SVarun Sethi 391695093e3SVarun Sethi info->dev = dev; 392695093e3SVarun Sethi info->liodn = liodn; 393695093e3SVarun Sethi info->domain = dma_domain; 394695093e3SVarun Sethi 395695093e3SVarun Sethi list_add(&info->link, &dma_domain->devices); 396695093e3SVarun Sethi /* 397695093e3SVarun Sethi * In case of devices with multiple LIODNs just store 398695093e3SVarun Sethi * the info for the first LIODN as all 399695093e3SVarun Sethi * LIODNs share the same domain 400695093e3SVarun Sethi */ 401695093e3SVarun Sethi if (!old_domain_info) 402695093e3SVarun Sethi dev->archdata.iommu_domain = info; 403695093e3SVarun Sethi spin_unlock_irqrestore(&device_domain_lock, flags); 404695093e3SVarun Sethi 405695093e3SVarun Sethi } 406695093e3SVarun Sethi 407695093e3SVarun Sethi static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain, 408695093e3SVarun Sethi dma_addr_t iova) 409695093e3SVarun Sethi { 410695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 411695093e3SVarun Sethi 412695093e3SVarun Sethi if ((iova < domain->geometry.aperture_start) || 413695093e3SVarun Sethi iova > (domain->geometry.aperture_end)) 414695093e3SVarun Sethi return 0; 415695093e3SVarun Sethi 416695093e3SVarun Sethi return get_phys_addr(dma_domain, iova); 417695093e3SVarun Sethi } 418695093e3SVarun Sethi 419695093e3SVarun Sethi static int fsl_pamu_domain_has_cap(struct iommu_domain *domain, 420695093e3SVarun Sethi unsigned long cap) 421695093e3SVarun Sethi { 422695093e3SVarun Sethi return cap == IOMMU_CAP_CACHE_COHERENCY; 423695093e3SVarun Sethi } 424695093e3SVarun Sethi 425695093e3SVarun Sethi static void fsl_pamu_domain_destroy(struct iommu_domain *domain) 426695093e3SVarun Sethi { 427695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 428695093e3SVarun Sethi 429695093e3SVarun Sethi domain->priv = NULL; 430695093e3SVarun Sethi 431695093e3SVarun Sethi /* remove all the devices from the device list */ 432695093e3SVarun Sethi detach_device(NULL, dma_domain); 433695093e3SVarun Sethi 434695093e3SVarun Sethi dma_domain->enabled = 0; 435695093e3SVarun Sethi dma_domain->mapped = 0; 436695093e3SVarun Sethi 437695093e3SVarun Sethi kmem_cache_free(fsl_pamu_domain_cache, dma_domain); 438695093e3SVarun Sethi } 439695093e3SVarun Sethi 440695093e3SVarun Sethi static int fsl_pamu_domain_init(struct iommu_domain *domain) 441695093e3SVarun Sethi { 442695093e3SVarun Sethi struct fsl_dma_domain *dma_domain; 443695093e3SVarun Sethi 444695093e3SVarun Sethi dma_domain = iommu_alloc_dma_domain(); 445695093e3SVarun Sethi if (!dma_domain) { 446695093e3SVarun Sethi pr_debug("dma_domain allocation failed\n"); 447695093e3SVarun Sethi return -ENOMEM; 448695093e3SVarun Sethi } 449695093e3SVarun Sethi domain->priv = dma_domain; 450695093e3SVarun Sethi dma_domain->iommu_domain = domain; 451695093e3SVarun Sethi /* defaul geometry 64 GB i.e. maximum system address */ 452695093e3SVarun Sethi domain->geometry.aperture_start = 0; 453695093e3SVarun Sethi domain->geometry.aperture_end = (1ULL << 36) - 1; 454695093e3SVarun Sethi domain->geometry.force_aperture = true; 455695093e3SVarun Sethi 456695093e3SVarun Sethi return 0; 457695093e3SVarun Sethi } 458695093e3SVarun Sethi 459695093e3SVarun Sethi /* Configure geometry settings for all LIODNs associated with domain */ 460695093e3SVarun Sethi static int pamu_set_domain_geometry(struct fsl_dma_domain *dma_domain, 461695093e3SVarun Sethi struct iommu_domain_geometry *geom_attr, 462695093e3SVarun Sethi u32 win_cnt) 463695093e3SVarun Sethi { 464695093e3SVarun Sethi struct device_domain_info *info; 465695093e3SVarun Sethi int ret = 0; 466695093e3SVarun Sethi 467695093e3SVarun Sethi list_for_each_entry(info, &dma_domain->devices, link) { 468695093e3SVarun Sethi ret = pamu_set_liodn(info->liodn, info->dev, dma_domain, 469695093e3SVarun Sethi geom_attr, win_cnt); 470695093e3SVarun Sethi if (ret) 471695093e3SVarun Sethi break; 472695093e3SVarun Sethi } 473695093e3SVarun Sethi 474695093e3SVarun Sethi return ret; 475695093e3SVarun Sethi } 476695093e3SVarun Sethi 477695093e3SVarun Sethi /* Update stash destination for all LIODNs associated with the domain */ 478695093e3SVarun Sethi static int update_domain_stash(struct fsl_dma_domain *dma_domain, u32 val) 479695093e3SVarun Sethi { 480695093e3SVarun Sethi struct device_domain_info *info; 481695093e3SVarun Sethi int ret = 0; 482695093e3SVarun Sethi 483695093e3SVarun Sethi list_for_each_entry(info, &dma_domain->devices, link) { 484695093e3SVarun Sethi ret = update_liodn_stash(info->liodn, dma_domain, val); 485695093e3SVarun Sethi if (ret) 486695093e3SVarun Sethi break; 487695093e3SVarun Sethi } 488695093e3SVarun Sethi 489695093e3SVarun Sethi return ret; 490695093e3SVarun Sethi } 491695093e3SVarun Sethi 492695093e3SVarun Sethi /* Update domain mappings for all LIODNs associated with the domain */ 493695093e3SVarun Sethi static int update_domain_mapping(struct fsl_dma_domain *dma_domain, u32 wnd_nr) 494695093e3SVarun Sethi { 495695093e3SVarun Sethi struct device_domain_info *info; 496695093e3SVarun Sethi int ret = 0; 497695093e3SVarun Sethi 498695093e3SVarun Sethi list_for_each_entry(info, &dma_domain->devices, link) { 499695093e3SVarun Sethi ret = update_liodn(info->liodn, dma_domain, wnd_nr); 500695093e3SVarun Sethi if (ret) 501695093e3SVarun Sethi break; 502695093e3SVarun Sethi } 503695093e3SVarun Sethi return ret; 504695093e3SVarun Sethi } 505695093e3SVarun Sethi 506695093e3SVarun Sethi static int disable_domain_win(struct fsl_dma_domain *dma_domain, u32 wnd_nr) 507695093e3SVarun Sethi { 508695093e3SVarun Sethi struct device_domain_info *info; 509695093e3SVarun Sethi int ret = 0; 510695093e3SVarun Sethi 511695093e3SVarun Sethi list_for_each_entry(info, &dma_domain->devices, link) { 512695093e3SVarun Sethi if (dma_domain->win_cnt == 1 && dma_domain->enabled) { 513695093e3SVarun Sethi ret = pamu_disable_liodn(info->liodn); 514695093e3SVarun Sethi if (!ret) 515695093e3SVarun Sethi dma_domain->enabled = 0; 516695093e3SVarun Sethi } else { 517695093e3SVarun Sethi ret = pamu_disable_spaace(info->liodn, wnd_nr); 518695093e3SVarun Sethi } 519695093e3SVarun Sethi } 520695093e3SVarun Sethi 521695093e3SVarun Sethi return ret; 522695093e3SVarun Sethi } 523695093e3SVarun Sethi 524695093e3SVarun Sethi static void fsl_pamu_window_disable(struct iommu_domain *domain, u32 wnd_nr) 525695093e3SVarun Sethi { 526695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 527695093e3SVarun Sethi unsigned long flags; 528695093e3SVarun Sethi int ret; 529695093e3SVarun Sethi 530695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 531695093e3SVarun Sethi if (!dma_domain->win_arr) { 532695093e3SVarun Sethi pr_debug("Number of windows not configured\n"); 533695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 534695093e3SVarun Sethi return; 535695093e3SVarun Sethi } 536695093e3SVarun Sethi 537695093e3SVarun Sethi if (wnd_nr >= dma_domain->win_cnt) { 538695093e3SVarun Sethi pr_debug("Invalid window index\n"); 539695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 540695093e3SVarun Sethi return; 541695093e3SVarun Sethi } 542695093e3SVarun Sethi 543695093e3SVarun Sethi if (dma_domain->win_arr[wnd_nr].valid) { 544695093e3SVarun Sethi ret = disable_domain_win(dma_domain, wnd_nr); 545695093e3SVarun Sethi if (!ret) { 546695093e3SVarun Sethi dma_domain->win_arr[wnd_nr].valid = 0; 547695093e3SVarun Sethi dma_domain->mapped--; 548695093e3SVarun Sethi } 549695093e3SVarun Sethi } 550695093e3SVarun Sethi 551695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 552695093e3SVarun Sethi 553695093e3SVarun Sethi } 554695093e3SVarun Sethi 555695093e3SVarun Sethi static int fsl_pamu_window_enable(struct iommu_domain *domain, u32 wnd_nr, 556695093e3SVarun Sethi phys_addr_t paddr, u64 size, int prot) 557695093e3SVarun Sethi { 558695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 559695093e3SVarun Sethi struct dma_window *wnd; 560695093e3SVarun Sethi int pamu_prot = 0; 561695093e3SVarun Sethi int ret; 562695093e3SVarun Sethi unsigned long flags; 563695093e3SVarun Sethi u64 win_size; 564695093e3SVarun Sethi 565695093e3SVarun Sethi if (prot & IOMMU_READ) 566695093e3SVarun Sethi pamu_prot |= PAACE_AP_PERMS_QUERY; 567695093e3SVarun Sethi if (prot & IOMMU_WRITE) 568695093e3SVarun Sethi pamu_prot |= PAACE_AP_PERMS_UPDATE; 569695093e3SVarun Sethi 570695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 571695093e3SVarun Sethi if (!dma_domain->win_arr) { 572695093e3SVarun Sethi pr_debug("Number of windows not configured\n"); 573695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 574695093e3SVarun Sethi return -ENODEV; 575695093e3SVarun Sethi } 576695093e3SVarun Sethi 577695093e3SVarun Sethi if (wnd_nr >= dma_domain->win_cnt) { 578695093e3SVarun Sethi pr_debug("Invalid window index\n"); 579695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 580695093e3SVarun Sethi return -EINVAL; 581695093e3SVarun Sethi } 582695093e3SVarun Sethi 583695093e3SVarun Sethi win_size = dma_domain->geom_size >> ilog2(dma_domain->win_cnt); 584695093e3SVarun Sethi if (size > win_size) { 585695093e3SVarun Sethi pr_debug("Invalid window size \n"); 586695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 587695093e3SVarun Sethi return -EINVAL; 588695093e3SVarun Sethi } 589695093e3SVarun Sethi 590695093e3SVarun Sethi if (dma_domain->win_cnt == 1) { 591695093e3SVarun Sethi if (dma_domain->enabled) { 592695093e3SVarun Sethi pr_debug("Disable the window before updating the mapping\n"); 593695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 594695093e3SVarun Sethi return -EBUSY; 595695093e3SVarun Sethi } 596695093e3SVarun Sethi 597695093e3SVarun Sethi ret = check_size(size, domain->geometry.aperture_start); 598695093e3SVarun Sethi if (ret) { 599695093e3SVarun Sethi pr_debug("Aperture start not aligned to the size\n"); 600695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 601695093e3SVarun Sethi return -EINVAL; 602695093e3SVarun Sethi } 603695093e3SVarun Sethi } 604695093e3SVarun Sethi 605695093e3SVarun Sethi wnd = &dma_domain->win_arr[wnd_nr]; 606695093e3SVarun Sethi if (!wnd->valid) { 607695093e3SVarun Sethi wnd->paddr = paddr; 608695093e3SVarun Sethi wnd->size = size; 609695093e3SVarun Sethi wnd->prot = pamu_prot; 610695093e3SVarun Sethi 611695093e3SVarun Sethi ret = update_domain_mapping(dma_domain, wnd_nr); 612695093e3SVarun Sethi if (!ret) { 613695093e3SVarun Sethi wnd->valid = 1; 614695093e3SVarun Sethi dma_domain->mapped++; 615695093e3SVarun Sethi } 616695093e3SVarun Sethi } else { 617695093e3SVarun Sethi pr_debug("Disable the window before updating the mapping\n"); 618695093e3SVarun Sethi ret = -EBUSY; 619695093e3SVarun Sethi } 620695093e3SVarun Sethi 621695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 622695093e3SVarun Sethi 623695093e3SVarun Sethi return ret; 624695093e3SVarun Sethi } 625695093e3SVarun Sethi 626695093e3SVarun Sethi /* 627695093e3SVarun Sethi * Attach the LIODN to the DMA domain and configure the geometry 628695093e3SVarun Sethi * and window mappings. 629695093e3SVarun Sethi */ 630695093e3SVarun Sethi static int handle_attach_device(struct fsl_dma_domain *dma_domain, 631695093e3SVarun Sethi struct device *dev, const u32 *liodn, 632695093e3SVarun Sethi int num) 633695093e3SVarun Sethi { 634695093e3SVarun Sethi unsigned long flags; 635695093e3SVarun Sethi struct iommu_domain *domain = dma_domain->iommu_domain; 636695093e3SVarun Sethi int ret = 0; 637695093e3SVarun Sethi int i; 638695093e3SVarun Sethi 639695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 640695093e3SVarun Sethi for (i = 0; i < num; i++) { 641695093e3SVarun Sethi 642695093e3SVarun Sethi /* Ensure that LIODN value is valid */ 643695093e3SVarun Sethi if (liodn[i] >= PAACE_NUMBER_ENTRIES) { 644695093e3SVarun Sethi pr_debug("Invalid liodn %d, attach device failed for %s\n", 645695093e3SVarun Sethi liodn[i], dev->of_node->full_name); 646695093e3SVarun Sethi ret = -EINVAL; 647695093e3SVarun Sethi break; 648695093e3SVarun Sethi } 649695093e3SVarun Sethi 650695093e3SVarun Sethi attach_device(dma_domain, liodn[i], dev); 651695093e3SVarun Sethi /* 652695093e3SVarun Sethi * Check if geometry has already been configured 653695093e3SVarun Sethi * for the domain. If yes, set the geometry for 654695093e3SVarun Sethi * the LIODN. 655695093e3SVarun Sethi */ 656695093e3SVarun Sethi if (dma_domain->win_arr) { 657695093e3SVarun Sethi u32 win_cnt = dma_domain->win_cnt > 1 ? dma_domain->win_cnt : 0; 658695093e3SVarun Sethi ret = pamu_set_liodn(liodn[i], dev, dma_domain, 659695093e3SVarun Sethi &domain->geometry, 660695093e3SVarun Sethi win_cnt); 661695093e3SVarun Sethi if (ret) 662695093e3SVarun Sethi break; 663695093e3SVarun Sethi if (dma_domain->mapped) { 664695093e3SVarun Sethi /* 665695093e3SVarun Sethi * Create window/subwindow mapping for 666695093e3SVarun Sethi * the LIODN. 667695093e3SVarun Sethi */ 668695093e3SVarun Sethi ret = map_liodn(liodn[i], dma_domain); 669695093e3SVarun Sethi if (ret) 670695093e3SVarun Sethi break; 671695093e3SVarun Sethi } 672695093e3SVarun Sethi } 673695093e3SVarun Sethi } 674695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 675695093e3SVarun Sethi 676695093e3SVarun Sethi return ret; 677695093e3SVarun Sethi } 678695093e3SVarun Sethi 679695093e3SVarun Sethi static int fsl_pamu_attach_device(struct iommu_domain *domain, 680695093e3SVarun Sethi struct device *dev) 681695093e3SVarun Sethi { 682695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 683695093e3SVarun Sethi const u32 *liodn; 684695093e3SVarun Sethi u32 liodn_cnt; 685695093e3SVarun Sethi int len, ret = 0; 686695093e3SVarun Sethi struct pci_dev *pdev = NULL; 687695093e3SVarun Sethi struct pci_controller *pci_ctl; 688695093e3SVarun Sethi 689695093e3SVarun Sethi /* 690695093e3SVarun Sethi * Use LIODN of the PCI controller while attaching a 691695093e3SVarun Sethi * PCI device. 692695093e3SVarun Sethi */ 693b3eb76d1SYijing Wang if (dev_is_pci(dev)) { 694695093e3SVarun Sethi pdev = to_pci_dev(dev); 695695093e3SVarun Sethi pci_ctl = pci_bus_to_host(pdev->bus); 696695093e3SVarun Sethi /* 697695093e3SVarun Sethi * make dev point to pci controller device 698695093e3SVarun Sethi * so we can get the LIODN programmed by 699695093e3SVarun Sethi * u-boot. 700695093e3SVarun Sethi */ 701695093e3SVarun Sethi dev = pci_ctl->parent; 702695093e3SVarun Sethi } 703695093e3SVarun Sethi 704695093e3SVarun Sethi liodn = of_get_property(dev->of_node, "fsl,liodn", &len); 705695093e3SVarun Sethi if (liodn) { 706695093e3SVarun Sethi liodn_cnt = len / sizeof(u32); 707695093e3SVarun Sethi ret = handle_attach_device(dma_domain, dev, 708695093e3SVarun Sethi liodn, liodn_cnt); 709695093e3SVarun Sethi } else { 710695093e3SVarun Sethi pr_debug("missing fsl,liodn property at %s\n", 711695093e3SVarun Sethi dev->of_node->full_name); 712695093e3SVarun Sethi ret = -EINVAL; 713695093e3SVarun Sethi } 714695093e3SVarun Sethi 715695093e3SVarun Sethi return ret; 716695093e3SVarun Sethi } 717695093e3SVarun Sethi 718695093e3SVarun Sethi static void fsl_pamu_detach_device(struct iommu_domain *domain, 719695093e3SVarun Sethi struct device *dev) 720695093e3SVarun Sethi { 721695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 722695093e3SVarun Sethi const u32 *prop; 723695093e3SVarun Sethi int len; 724695093e3SVarun Sethi struct pci_dev *pdev = NULL; 725695093e3SVarun Sethi struct pci_controller *pci_ctl; 726695093e3SVarun Sethi 727695093e3SVarun Sethi /* 728695093e3SVarun Sethi * Use LIODN of the PCI controller while detaching a 729695093e3SVarun Sethi * PCI device. 730695093e3SVarun Sethi */ 731b3eb76d1SYijing Wang if (dev_is_pci(dev)) { 732695093e3SVarun Sethi pdev = to_pci_dev(dev); 733695093e3SVarun Sethi pci_ctl = pci_bus_to_host(pdev->bus); 734695093e3SVarun Sethi /* 735695093e3SVarun Sethi * make dev point to pci controller device 736695093e3SVarun Sethi * so we can get the LIODN programmed by 737695093e3SVarun Sethi * u-boot. 738695093e3SVarun Sethi */ 739695093e3SVarun Sethi dev = pci_ctl->parent; 740695093e3SVarun Sethi } 741695093e3SVarun Sethi 742695093e3SVarun Sethi prop = of_get_property(dev->of_node, "fsl,liodn", &len); 743695093e3SVarun Sethi if (prop) 744695093e3SVarun Sethi detach_device(dev, dma_domain); 745695093e3SVarun Sethi else 746695093e3SVarun Sethi pr_debug("missing fsl,liodn property at %s\n", 747695093e3SVarun Sethi dev->of_node->full_name); 748695093e3SVarun Sethi } 749695093e3SVarun Sethi 750695093e3SVarun Sethi static int configure_domain_geometry(struct iommu_domain *domain, void *data) 751695093e3SVarun Sethi { 752695093e3SVarun Sethi struct iommu_domain_geometry *geom_attr = data; 753695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 754695093e3SVarun Sethi dma_addr_t geom_size; 755695093e3SVarun Sethi unsigned long flags; 756695093e3SVarun Sethi 757695093e3SVarun Sethi geom_size = geom_attr->aperture_end - geom_attr->aperture_start + 1; 758695093e3SVarun Sethi /* 759695093e3SVarun Sethi * Sanity check the geometry size. Also, we do not support 760695093e3SVarun Sethi * DMA outside of the geometry. 761695093e3SVarun Sethi */ 762695093e3SVarun Sethi if (check_size(geom_size, geom_attr->aperture_start) || 763695093e3SVarun Sethi !geom_attr->force_aperture) { 764695093e3SVarun Sethi pr_debug("Invalid PAMU geometry attributes\n"); 765695093e3SVarun Sethi return -EINVAL; 766695093e3SVarun Sethi } 767695093e3SVarun Sethi 768695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 769695093e3SVarun Sethi if (dma_domain->enabled) { 770695093e3SVarun Sethi pr_debug("Can't set geometry attributes as domain is active\n"); 771695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 772695093e3SVarun Sethi return -EBUSY; 773695093e3SVarun Sethi } 774695093e3SVarun Sethi 775695093e3SVarun Sethi /* Copy the domain geometry information */ 776695093e3SVarun Sethi memcpy(&domain->geometry, geom_attr, 777695093e3SVarun Sethi sizeof(struct iommu_domain_geometry)); 778695093e3SVarun Sethi dma_domain->geom_size = geom_size; 779695093e3SVarun Sethi 780695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 781695093e3SVarun Sethi 782695093e3SVarun Sethi return 0; 783695093e3SVarun Sethi } 784695093e3SVarun Sethi 785695093e3SVarun Sethi /* Set the domain stash attribute */ 786695093e3SVarun Sethi static int configure_domain_stash(struct fsl_dma_domain *dma_domain, void *data) 787695093e3SVarun Sethi { 788695093e3SVarun Sethi struct pamu_stash_attribute *stash_attr = data; 789695093e3SVarun Sethi unsigned long flags; 790695093e3SVarun Sethi int ret; 791695093e3SVarun Sethi 792695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 793695093e3SVarun Sethi 794695093e3SVarun Sethi memcpy(&dma_domain->dma_stash, stash_attr, 795695093e3SVarun Sethi sizeof(struct pamu_stash_attribute)); 796695093e3SVarun Sethi 797695093e3SVarun Sethi dma_domain->stash_id = get_stash_id(stash_attr->cache, 798695093e3SVarun Sethi stash_attr->cpu); 799695093e3SVarun Sethi if (dma_domain->stash_id == ~(u32)0) { 800695093e3SVarun Sethi pr_debug("Invalid stash attributes\n"); 801695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 802695093e3SVarun Sethi return -EINVAL; 803695093e3SVarun Sethi } 804695093e3SVarun Sethi 805695093e3SVarun Sethi ret = update_domain_stash(dma_domain, dma_domain->stash_id); 806695093e3SVarun Sethi 807695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 808695093e3SVarun Sethi 809695093e3SVarun Sethi return ret; 810695093e3SVarun Sethi } 811695093e3SVarun Sethi 812695093e3SVarun Sethi /* Configure domain dma state i.e. enable/disable DMA*/ 813695093e3SVarun Sethi static int configure_domain_dma_state(struct fsl_dma_domain *dma_domain, bool enable) 814695093e3SVarun Sethi { 815695093e3SVarun Sethi struct device_domain_info *info; 816695093e3SVarun Sethi unsigned long flags; 817695093e3SVarun Sethi int ret; 818695093e3SVarun Sethi 819695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 820695093e3SVarun Sethi 821695093e3SVarun Sethi if (enable && !dma_domain->mapped) { 822695093e3SVarun Sethi pr_debug("Can't enable DMA domain without valid mapping\n"); 823695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 824695093e3SVarun Sethi return -ENODEV; 825695093e3SVarun Sethi } 826695093e3SVarun Sethi 827695093e3SVarun Sethi dma_domain->enabled = enable; 828695093e3SVarun Sethi list_for_each_entry(info, &dma_domain->devices, 829695093e3SVarun Sethi link) { 830695093e3SVarun Sethi ret = (enable) ? pamu_enable_liodn(info->liodn) : 831695093e3SVarun Sethi pamu_disable_liodn(info->liodn); 832695093e3SVarun Sethi if (ret) 833695093e3SVarun Sethi pr_debug("Unable to set dma state for liodn %d", 834695093e3SVarun Sethi info->liodn); 835695093e3SVarun Sethi } 836695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 837695093e3SVarun Sethi 838695093e3SVarun Sethi return 0; 839695093e3SVarun Sethi } 840695093e3SVarun Sethi 841695093e3SVarun Sethi static int fsl_pamu_set_domain_attr(struct iommu_domain *domain, 842695093e3SVarun Sethi enum iommu_attr attr_type, void *data) 843695093e3SVarun Sethi { 844695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 845695093e3SVarun Sethi int ret = 0; 846695093e3SVarun Sethi 847695093e3SVarun Sethi 848695093e3SVarun Sethi switch (attr_type) { 849695093e3SVarun Sethi case DOMAIN_ATTR_GEOMETRY: 850695093e3SVarun Sethi ret = configure_domain_geometry(domain, data); 851695093e3SVarun Sethi break; 852695093e3SVarun Sethi case DOMAIN_ATTR_FSL_PAMU_STASH: 853695093e3SVarun Sethi ret = configure_domain_stash(dma_domain, data); 854695093e3SVarun Sethi break; 855695093e3SVarun Sethi case DOMAIN_ATTR_FSL_PAMU_ENABLE: 856695093e3SVarun Sethi ret = configure_domain_dma_state(dma_domain, *(int *)data); 857695093e3SVarun Sethi break; 858695093e3SVarun Sethi default: 859695093e3SVarun Sethi pr_debug("Unsupported attribute type\n"); 860695093e3SVarun Sethi ret = -EINVAL; 861695093e3SVarun Sethi break; 862695093e3SVarun Sethi }; 863695093e3SVarun Sethi 864695093e3SVarun Sethi return ret; 865695093e3SVarun Sethi } 866695093e3SVarun Sethi 867695093e3SVarun Sethi static int fsl_pamu_get_domain_attr(struct iommu_domain *domain, 868695093e3SVarun Sethi enum iommu_attr attr_type, void *data) 869695093e3SVarun Sethi { 870695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 871695093e3SVarun Sethi int ret = 0; 872695093e3SVarun Sethi 873695093e3SVarun Sethi 874695093e3SVarun Sethi switch (attr_type) { 875695093e3SVarun Sethi case DOMAIN_ATTR_FSL_PAMU_STASH: 876695093e3SVarun Sethi memcpy((struct pamu_stash_attribute *) data, &dma_domain->dma_stash, 877695093e3SVarun Sethi sizeof(struct pamu_stash_attribute)); 878695093e3SVarun Sethi break; 879695093e3SVarun Sethi case DOMAIN_ATTR_FSL_PAMU_ENABLE: 880695093e3SVarun Sethi *(int *)data = dma_domain->enabled; 881695093e3SVarun Sethi break; 882695093e3SVarun Sethi case DOMAIN_ATTR_FSL_PAMUV1: 883695093e3SVarun Sethi *(int *)data = DOMAIN_ATTR_FSL_PAMUV1; 884695093e3SVarun Sethi break; 885695093e3SVarun Sethi default: 886695093e3SVarun Sethi pr_debug("Unsupported attribute type\n"); 887695093e3SVarun Sethi ret = -EINVAL; 888695093e3SVarun Sethi break; 889695093e3SVarun Sethi }; 890695093e3SVarun Sethi 891695093e3SVarun Sethi return ret; 892695093e3SVarun Sethi } 893695093e3SVarun Sethi 894695093e3SVarun Sethi static struct iommu_group *get_device_iommu_group(struct device *dev) 895695093e3SVarun Sethi { 896695093e3SVarun Sethi struct iommu_group *group; 897695093e3SVarun Sethi 898695093e3SVarun Sethi group = iommu_group_get(dev); 899695093e3SVarun Sethi if (!group) 900695093e3SVarun Sethi group = iommu_group_alloc(); 901695093e3SVarun Sethi 902695093e3SVarun Sethi return group; 903695093e3SVarun Sethi } 904695093e3SVarun Sethi 905695093e3SVarun Sethi static bool check_pci_ctl_endpt_part(struct pci_controller *pci_ctl) 906695093e3SVarun Sethi { 907695093e3SVarun Sethi u32 version; 908695093e3SVarun Sethi 909695093e3SVarun Sethi /* Check the PCI controller version number by readding BRR1 register */ 910695093e3SVarun Sethi version = in_be32(pci_ctl->cfg_addr + (PCI_FSL_BRR1 >> 2)); 911695093e3SVarun Sethi version &= PCI_FSL_BRR1_VER; 912695093e3SVarun Sethi /* If PCI controller version is >= 0x204 we can partition endpoints*/ 913695093e3SVarun Sethi if (version >= 0x204) 914695093e3SVarun Sethi return 1; 915695093e3SVarun Sethi 916695093e3SVarun Sethi return 0; 917695093e3SVarun Sethi } 918695093e3SVarun Sethi 919695093e3SVarun Sethi /* Get iommu group information from peer devices or devices on the parent bus */ 920695093e3SVarun Sethi static struct iommu_group *get_shared_pci_device_group(struct pci_dev *pdev) 921695093e3SVarun Sethi { 922695093e3SVarun Sethi struct pci_dev *tmp; 923695093e3SVarun Sethi struct iommu_group *group; 924695093e3SVarun Sethi struct pci_bus *bus = pdev->bus; 925695093e3SVarun Sethi 926695093e3SVarun Sethi /* 927695093e3SVarun Sethi * Traverese the pci bus device list to get 928695093e3SVarun Sethi * the shared iommu group. 929695093e3SVarun Sethi */ 930695093e3SVarun Sethi while (bus) { 931695093e3SVarun Sethi list_for_each_entry(tmp, &bus->devices, bus_list) { 932695093e3SVarun Sethi if (tmp == pdev) 933695093e3SVarun Sethi continue; 934695093e3SVarun Sethi group = iommu_group_get(&tmp->dev); 935695093e3SVarun Sethi if (group) 936695093e3SVarun Sethi return group; 937695093e3SVarun Sethi } 938695093e3SVarun Sethi 939695093e3SVarun Sethi bus = bus->parent; 940695093e3SVarun Sethi } 941695093e3SVarun Sethi 942695093e3SVarun Sethi return NULL; 943695093e3SVarun Sethi } 944695093e3SVarun Sethi 945695093e3SVarun Sethi static struct iommu_group *get_pci_device_group(struct pci_dev *pdev) 946695093e3SVarun Sethi { 947695093e3SVarun Sethi struct pci_controller *pci_ctl; 948695093e3SVarun Sethi bool pci_endpt_partioning; 949695093e3SVarun Sethi struct iommu_group *group = NULL; 950695093e3SVarun Sethi 951695093e3SVarun Sethi pci_ctl = pci_bus_to_host(pdev->bus); 952695093e3SVarun Sethi pci_endpt_partioning = check_pci_ctl_endpt_part(pci_ctl); 953695093e3SVarun Sethi /* We can partition PCIe devices so assign device group to the device */ 954695093e3SVarun Sethi if (pci_endpt_partioning) { 9557319ededSAlex Williamson group = iommu_group_get_for_dev(&pdev->dev); 956695093e3SVarun Sethi 957695093e3SVarun Sethi /* 958695093e3SVarun Sethi * PCIe controller is not a paritionable entity 959695093e3SVarun Sethi * free the controller device iommu_group. 960695093e3SVarun Sethi */ 961695093e3SVarun Sethi if (pci_ctl->parent->iommu_group) 962695093e3SVarun Sethi iommu_group_remove_device(pci_ctl->parent); 963695093e3SVarun Sethi } else { 964695093e3SVarun Sethi /* 965695093e3SVarun Sethi * All devices connected to the controller will share the 966695093e3SVarun Sethi * PCI controllers device group. If this is the first 967695093e3SVarun Sethi * device to be probed for the pci controller, copy the 968695093e3SVarun Sethi * device group information from the PCI controller device 969695093e3SVarun Sethi * node and remove the PCI controller iommu group. 970695093e3SVarun Sethi * For subsequent devices, the iommu group information can 971695093e3SVarun Sethi * be obtained from sibling devices (i.e. from the bus_devices 972695093e3SVarun Sethi * link list). 973695093e3SVarun Sethi */ 974695093e3SVarun Sethi if (pci_ctl->parent->iommu_group) { 975695093e3SVarun Sethi group = get_device_iommu_group(pci_ctl->parent); 976695093e3SVarun Sethi iommu_group_remove_device(pci_ctl->parent); 977695093e3SVarun Sethi } else 978695093e3SVarun Sethi group = get_shared_pci_device_group(pdev); 979695093e3SVarun Sethi } 980695093e3SVarun Sethi 981695093e3SVarun Sethi return group; 982695093e3SVarun Sethi } 983695093e3SVarun Sethi 984695093e3SVarun Sethi static int fsl_pamu_add_device(struct device *dev) 985695093e3SVarun Sethi { 986695093e3SVarun Sethi struct iommu_group *group = NULL; 987695093e3SVarun Sethi struct pci_dev *pdev; 988695093e3SVarun Sethi const u32 *prop; 989695093e3SVarun Sethi int ret, len; 990695093e3SVarun Sethi 991695093e3SVarun Sethi /* 992695093e3SVarun Sethi * For platform devices we allocate a separate group for 993695093e3SVarun Sethi * each of the devices. 994695093e3SVarun Sethi */ 995b3eb76d1SYijing Wang if (dev_is_pci(dev)) { 996695093e3SVarun Sethi pdev = to_pci_dev(dev); 997695093e3SVarun Sethi /* Don't create device groups for virtual PCI bridges */ 998695093e3SVarun Sethi if (pdev->subordinate) 999695093e3SVarun Sethi return 0; 1000695093e3SVarun Sethi 1001695093e3SVarun Sethi group = get_pci_device_group(pdev); 1002695093e3SVarun Sethi 1003695093e3SVarun Sethi } else { 1004695093e3SVarun Sethi prop = of_get_property(dev->of_node, "fsl,liodn", &len); 1005695093e3SVarun Sethi if (prop) 1006695093e3SVarun Sethi group = get_device_iommu_group(dev); 1007695093e3SVarun Sethi } 1008695093e3SVarun Sethi 1009695093e3SVarun Sethi if (!group || IS_ERR(group)) 1010695093e3SVarun Sethi return PTR_ERR(group); 1011695093e3SVarun Sethi 1012695093e3SVarun Sethi ret = iommu_group_add_device(group, dev); 1013695093e3SVarun Sethi 1014695093e3SVarun Sethi iommu_group_put(group); 1015695093e3SVarun Sethi return ret; 1016695093e3SVarun Sethi } 1017695093e3SVarun Sethi 1018695093e3SVarun Sethi static void fsl_pamu_remove_device(struct device *dev) 1019695093e3SVarun Sethi { 1020695093e3SVarun Sethi iommu_group_remove_device(dev); 1021695093e3SVarun Sethi } 1022695093e3SVarun Sethi 1023695093e3SVarun Sethi static int fsl_pamu_set_windows(struct iommu_domain *domain, u32 w_count) 1024695093e3SVarun Sethi { 1025695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 1026695093e3SVarun Sethi unsigned long flags; 1027695093e3SVarun Sethi int ret; 1028695093e3SVarun Sethi 1029695093e3SVarun Sethi spin_lock_irqsave(&dma_domain->domain_lock, flags); 1030695093e3SVarun Sethi /* Ensure domain is inactive i.e. DMA should be disabled for the domain */ 1031695093e3SVarun Sethi if (dma_domain->enabled) { 1032695093e3SVarun Sethi pr_debug("Can't set geometry attributes as domain is active\n"); 1033695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 1034695093e3SVarun Sethi return -EBUSY; 1035695093e3SVarun Sethi } 1036695093e3SVarun Sethi 1037695093e3SVarun Sethi /* Ensure that the geometry has been set for the domain */ 1038695093e3SVarun Sethi if (!dma_domain->geom_size) { 1039695093e3SVarun Sethi pr_debug("Please configure geometry before setting the number of windows\n"); 1040695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 1041695093e3SVarun Sethi return -EINVAL; 1042695093e3SVarun Sethi } 1043695093e3SVarun Sethi 1044695093e3SVarun Sethi /* 1045695093e3SVarun Sethi * Ensure we have valid window count i.e. it should be less than 1046695093e3SVarun Sethi * maximum permissible limit and should be a power of two. 1047695093e3SVarun Sethi */ 1048695093e3SVarun Sethi if (w_count > pamu_get_max_subwin_cnt() || !is_power_of_2(w_count)) { 1049695093e3SVarun Sethi pr_debug("Invalid window count\n"); 1050695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 1051695093e3SVarun Sethi return -EINVAL; 1052695093e3SVarun Sethi } 1053695093e3SVarun Sethi 1054695093e3SVarun Sethi ret = pamu_set_domain_geometry(dma_domain, &domain->geometry, 1055695093e3SVarun Sethi ((w_count > 1) ? w_count : 0)); 1056695093e3SVarun Sethi if (!ret) { 1057695093e3SVarun Sethi if (dma_domain->win_arr) 1058695093e3SVarun Sethi kfree(dma_domain->win_arr); 1059695093e3SVarun Sethi dma_domain->win_arr = kzalloc(sizeof(struct dma_window) * 1060695093e3SVarun Sethi w_count, GFP_ATOMIC); 1061695093e3SVarun Sethi if (!dma_domain->win_arr) { 1062695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 1063695093e3SVarun Sethi return -ENOMEM; 1064695093e3SVarun Sethi } 1065695093e3SVarun Sethi dma_domain->win_cnt = w_count; 1066695093e3SVarun Sethi } 1067695093e3SVarun Sethi spin_unlock_irqrestore(&dma_domain->domain_lock, flags); 1068695093e3SVarun Sethi 1069695093e3SVarun Sethi return ret; 1070695093e3SVarun Sethi } 1071695093e3SVarun Sethi 1072695093e3SVarun Sethi static u32 fsl_pamu_get_windows(struct iommu_domain *domain) 1073695093e3SVarun Sethi { 1074695093e3SVarun Sethi struct fsl_dma_domain *dma_domain = domain->priv; 1075695093e3SVarun Sethi 1076695093e3SVarun Sethi return dma_domain->win_cnt; 1077695093e3SVarun Sethi } 1078695093e3SVarun Sethi 1079695093e3SVarun Sethi static struct iommu_ops fsl_pamu_ops = { 1080695093e3SVarun Sethi .domain_init = fsl_pamu_domain_init, 1081695093e3SVarun Sethi .domain_destroy = fsl_pamu_domain_destroy, 1082695093e3SVarun Sethi .attach_dev = fsl_pamu_attach_device, 1083695093e3SVarun Sethi .detach_dev = fsl_pamu_detach_device, 1084695093e3SVarun Sethi .domain_window_enable = fsl_pamu_window_enable, 1085695093e3SVarun Sethi .domain_window_disable = fsl_pamu_window_disable, 1086695093e3SVarun Sethi .domain_get_windows = fsl_pamu_get_windows, 1087695093e3SVarun Sethi .domain_set_windows = fsl_pamu_set_windows, 1088695093e3SVarun Sethi .iova_to_phys = fsl_pamu_iova_to_phys, 1089695093e3SVarun Sethi .domain_has_cap = fsl_pamu_domain_has_cap, 1090695093e3SVarun Sethi .domain_set_attr = fsl_pamu_set_domain_attr, 1091695093e3SVarun Sethi .domain_get_attr = fsl_pamu_get_domain_attr, 1092695093e3SVarun Sethi .add_device = fsl_pamu_add_device, 1093695093e3SVarun Sethi .remove_device = fsl_pamu_remove_device, 1094695093e3SVarun Sethi }; 1095695093e3SVarun Sethi 1096695093e3SVarun Sethi int pamu_domain_init() 1097695093e3SVarun Sethi { 1098695093e3SVarun Sethi int ret = 0; 1099695093e3SVarun Sethi 1100695093e3SVarun Sethi ret = iommu_init_mempool(); 1101695093e3SVarun Sethi if (ret) 1102695093e3SVarun Sethi return ret; 1103695093e3SVarun Sethi 1104695093e3SVarun Sethi bus_set_iommu(&platform_bus_type, &fsl_pamu_ops); 1105695093e3SVarun Sethi bus_set_iommu(&pci_bus_type, &fsl_pamu_ops); 1106695093e3SVarun Sethi 1107695093e3SVarun Sethi return ret; 1108695093e3SVarun Sethi } 1109