diff options
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/gntdev.c | 11 | ||||
| -rw-r--r-- | drivers/xen/swiotlb-xen.c | 47 | ||||
| -rw-r--r-- | drivers/xen/xen-acpi-processor.c | 36 | ||||
| -rw-r--r-- | drivers/xen/xenbus/xenbus_dev_frontend.c | 1 |
4 files changed, 80 insertions, 15 deletions
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c index c77a0751a311..f3bf8f4e2d6c 100644 --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -36,6 +36,7 @@ #include <linux/spinlock.h> #include <linux/slab.h> #include <linux/highmem.h> +#include <linux/refcount.h> #include <xen/xen.h> #include <xen/grant_table.h> @@ -86,7 +87,7 @@ struct grant_map { int index; int count; int flags; - atomic_t users; + refcount_t users; struct unmap_notify notify; struct ioctl_gntdev_grant_ref *grants; struct gnttab_map_grant_ref *map_ops; @@ -166,7 +167,7 @@ static struct grant_map *gntdev_alloc_map(struct gntdev_priv *priv, int count) add->index = 0; add->count = count; - atomic_set(&add->users, 1); + refcount_set(&add->users, 1); return add; @@ -212,7 +213,7 @@ static void gntdev_put_map(struct gntdev_priv *priv, struct grant_map *map) if (!map) return; - if (!atomic_dec_and_test(&map->users)) + if (!refcount_dec_and_test(&map->users)) return; atomic_sub(map->count, &pages_mapped); @@ -400,7 +401,7 @@ static void gntdev_vma_open(struct vm_area_struct *vma) struct grant_map *map = vma->vm_private_data; pr_debug("gntdev_vma_open %p\n", vma); - atomic_inc(&map->users); + refcount_inc(&map->users); } static void gntdev_vma_close(struct vm_area_struct *vma) @@ -1004,7 +1005,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma) goto unlock_out; } - atomic_inc(&map->users); + refcount_inc(&map->users); vma->vm_ops = &gntdev_vmops; diff --git a/drivers/xen/swiotlb-xen.c b/drivers/xen/swiotlb-xen.c index f8afc6dcc29f..e8cef1ad0fe3 100644 --- a/drivers/xen/swiotlb-xen.c +++ b/drivers/xen/swiotlb-xen.c @@ -681,3 +681,50 @@ xen_swiotlb_set_dma_mask(struct device *dev, u64 dma_mask) return 0; } EXPORT_SYMBOL_GPL(xen_swiotlb_set_dma_mask); + +/* + * Create userspace mapping for the DMA-coherent memory. + * This function should be called with the pages from the current domain only, + * passing pages mapped from other domains would lead to memory corruption. + */ +int +xen_swiotlb_dma_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs) +{ +#if defined(CONFIG_ARM) || defined(CONFIG_ARM64) + if (__generic_dma_ops(dev)->mmap) + return __generic_dma_ops(dev)->mmap(dev, vma, cpu_addr, + dma_addr, size, attrs); +#endif + return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); +} +EXPORT_SYMBOL_GPL(xen_swiotlb_dma_mmap); + +/* + * This function should be called with the pages from the current domain only, + * passing pages mapped from other domains would lead to memory corruption. + */ +int +xen_swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt, + void *cpu_addr, dma_addr_t handle, size_t size, + unsigned long attrs) +{ +#if defined(CONFIG_ARM) || defined(CONFIG_ARM64) + if (__generic_dma_ops(dev)->get_sgtable) { +#if 0 + /* + * This check verifies that the page belongs to the current domain and + * is not one mapped from another domain. + * This check is for debug only, and should not go to production build + */ + unsigned long bfn = PHYS_PFN(dma_to_phys(dev, handle)); + BUG_ON (!page_is_ram(bfn)); +#endif + return __generic_dma_ops(dev)->get_sgtable(dev, sgt, cpu_addr, + handle, size, attrs); + } +#endif + return dma_common_get_sgtable(dev, sgt, cpu_addr, handle, size); +} +EXPORT_SYMBOL_GPL(xen_swiotlb_get_sgtable); diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c index 4ce10bcca18b..23e391d3ec01 100644 --- a/drivers/xen/xen-acpi-processor.c +++ b/drivers/xen/xen-acpi-processor.c @@ -27,10 +27,10 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/types.h> +#include <linux/syscore_ops.h> #include <linux/acpi.h> #include <acpi/processor.h> #include <xen/xen.h> -#include <xen/xen-ops.h> #include <xen/interface/platform.h> #include <asm/xen/hypercall.h> @@ -408,7 +408,7 @@ static int check_acpi_ids(struct acpi_processor *pr_backup) acpi_walk_namespace(ACPI_TYPE_PROCESSOR, ACPI_ROOT_OBJECT, ACPI_UINT32_MAX, read_acpi_id, NULL, NULL, NULL); - acpi_get_devices("ACPI0007", read_acpi_id, NULL, NULL); + acpi_get_devices(ACPI_PROCESSOR_DEVICE_HID, read_acpi_id, NULL, NULL); upload: if (!bitmap_equal(acpi_id_present, acpi_ids_done, nr_acpi_bits)) { @@ -466,15 +466,33 @@ static int xen_upload_processor_pm_data(void) return rc; } -static int xen_acpi_processor_resume(struct notifier_block *nb, - unsigned long action, void *data) +static void xen_acpi_processor_resume_worker(struct work_struct *dummy) { + int rc; + bitmap_zero(acpi_ids_done, nr_acpi_bits); - return xen_upload_processor_pm_data(); + + rc = xen_upload_processor_pm_data(); + if (rc != 0) + pr_info("ACPI data upload failed, error = %d\n", rc); +} + +static void xen_acpi_processor_resume(void) +{ + static DECLARE_WORK(wq, xen_acpi_processor_resume_worker); + + /* + * xen_upload_processor_pm_data() calls non-atomic code. + * However, the context for xen_acpi_processor_resume is syscore + * with only the boot CPU online and in an atomic context. + * + * So defer the upload for some point safer. + */ + schedule_work(&wq); } -struct notifier_block xen_acpi_processor_resume_nb = { - .notifier_call = xen_acpi_processor_resume, +static struct syscore_ops xap_syscore_ops = { + .resume = xen_acpi_processor_resume, }; static int __init xen_acpi_processor_init(void) @@ -527,7 +545,7 @@ static int __init xen_acpi_processor_init(void) if (rc) goto err_unregister; - xen_resume_notifier_register(&xen_acpi_processor_resume_nb); + register_syscore_ops(&xap_syscore_ops); return 0; err_unregister: @@ -544,7 +562,7 @@ static void __exit xen_acpi_processor_exit(void) { int i; - xen_resume_notifier_unregister(&xen_acpi_processor_resume_nb); + unregister_syscore_ops(&xap_syscore_ops); kfree(acpi_ids_done); kfree(acpi_id_present); kfree(acpi_id_cst_present); diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c index 4d343eed08f5..1f4733b80c87 100644 --- a/drivers/xen/xenbus/xenbus_dev_frontend.c +++ b/drivers/xen/xenbus/xenbus_dev_frontend.c @@ -55,7 +55,6 @@ #include <linux/string.h> #include <linux/slab.h> #include <linux/miscdevice.h> -#include <linux/init.h> #include <xen/xenbus.h> #include <xen/xen.h> |