summaryrefslogtreecommitdiff
path: root/drivers/base
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/Kconfig5
-rw-r--r--drivers/base/dma-coherent.c85
-rw-r--r--drivers/base/dma-mapping.c7
-rw-r--r--drivers/base/firmware_class.c99
4 files changed, 41 insertions, 155 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index f046d21de57d..1a5f6a157a57 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -140,13 +140,10 @@ config EXTRA_FIRMWARE
config EXTRA_FIRMWARE_DIR
string "Firmware blobs root directory"
depends on EXTRA_FIRMWARE != ""
- default "firmware"
+ default "/lib/firmware"
help
This option controls the directory in which the kernel build system
looks for the firmware files listed in the EXTRA_FIRMWARE option.
- The default is firmware/ in the kernel source tree, but by changing
- this option you can point it elsewhere, such as /lib/firmware/ or
- some other directory containing the firmware files.
config FW_LOADER_USER_HELPER
bool
diff --git a/drivers/base/dma-coherent.c b/drivers/base/dma-coherent.c
index 1c152aed6b82..a39b2166b145 100644
--- a/drivers/base/dma-coherent.c
+++ b/drivers/base/dma-coherent.c
@@ -37,7 +37,7 @@ static inline dma_addr_t dma_get_device_base(struct device *dev,
return mem->device_base;
}
-static bool dma_init_coherent_memory(
+static int dma_init_coherent_memory(
phys_addr_t phys_addr, dma_addr_t device_addr, size_t size, int flags,
struct dma_coherent_mem **mem)
{
@@ -45,25 +45,28 @@ static bool dma_init_coherent_memory(
void __iomem *mem_base = NULL;
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
+ int ret;
- if ((flags & (DMA_MEMORY_MAP | DMA_MEMORY_IO)) == 0)
- goto out;
- if (!size)
+ if (!size) {
+ ret = -EINVAL;
goto out;
+ }
- if (flags & DMA_MEMORY_MAP)
- mem_base = memremap(phys_addr, size, MEMREMAP_WC);
- else
- mem_base = ioremap(phys_addr, size);
- if (!mem_base)
+ mem_base = memremap(phys_addr, size, MEMREMAP_WC);
+ if (!mem_base) {
+ ret = -EINVAL;
goto out;
-
+ }
dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
- if (!dma_mem)
+ if (!dma_mem) {
+ ret = -ENOMEM;
goto out;
+ }
dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
- if (!dma_mem->bitmap)
+ if (!dma_mem->bitmap) {
+ ret = -ENOMEM;
goto out;
+ }
dma_mem->virt_base = mem_base;
dma_mem->device_base = device_addr;
@@ -73,17 +76,13 @@ static bool dma_init_coherent_memory(
spin_lock_init(&dma_mem->spinlock);
*mem = dma_mem;
- return true;
+ return 0;
out:
kfree(dma_mem);
- if (mem_base) {
- if (flags & DMA_MEMORY_MAP)
- memunmap(mem_base);
- else
- iounmap(mem_base);
- }
- return false;
+ if (mem_base)
+ memunmap(mem_base);
+ return ret;
}
static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
@@ -91,10 +90,7 @@ static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
if (!mem)
return;
- if (mem->flags & DMA_MEMORY_MAP)
- memunmap(mem->virt_base);
- else
- iounmap(mem->virt_base);
+ memunmap(mem->virt_base);
kfree(mem->bitmap);
kfree(mem);
}
@@ -109,8 +105,6 @@ static int dma_assign_coherent_memory(struct device *dev,
return -EBUSY;
dev->dma_mem = mem;
- /* FIXME: this routine just ignores DMA_MEMORY_INCLUDES_CHILDREN */
-
return 0;
}
@@ -118,16 +112,16 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
dma_addr_t device_addr, size_t size, int flags)
{
struct dma_coherent_mem *mem;
+ int ret;
- if (!dma_init_coherent_memory(phys_addr, device_addr, size, flags,
- &mem))
- return 0;
-
- if (dma_assign_coherent_memory(dev, mem) == 0)
- return flags & DMA_MEMORY_MAP ? DMA_MEMORY_MAP : DMA_MEMORY_IO;
+ ret = dma_init_coherent_memory(phys_addr, device_addr, size, flags, &mem);
+ if (ret)
+ return ret;
- dma_release_coherent_memory(mem);
- return 0;
+ ret = dma_assign_coherent_memory(dev, mem);
+ if (ret)
+ dma_release_coherent_memory(mem);
+ return ret;
}
EXPORT_SYMBOL(dma_declare_coherent_memory);
@@ -171,7 +165,6 @@ static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
int order = get_order(size);
unsigned long flags;
int pageno;
- int dma_memory_map;
void *ret;
spin_lock_irqsave(&mem->spinlock, flags);
@@ -188,15 +181,9 @@ static void *__dma_alloc_from_coherent(struct dma_coherent_mem *mem,
*/
*dma_handle = mem->device_base + (pageno << PAGE_SHIFT);
ret = mem->virt_base + (pageno << PAGE_SHIFT);
- dma_memory_map = (mem->flags & DMA_MEMORY_MAP);
spin_unlock_irqrestore(&mem->spinlock, flags);
- if (dma_memory_map)
- memset(ret, 0, size);
- else
- memset_io(ret, 0, size);
-
+ memset(ret, 0, size);
return ret;
-
err:
spin_unlock_irqrestore(&mem->spinlock, flags);
return NULL;
@@ -359,14 +346,18 @@ static struct reserved_mem *dma_reserved_default_memory __initdata;
static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
{
struct dma_coherent_mem *mem = rmem->priv;
+ int ret;
- if (!mem &&
- !dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
- DMA_MEMORY_MAP | DMA_MEMORY_EXCLUSIVE,
- &mem)) {
+ if (!mem)
+ return -ENODEV;
+
+ ret = dma_init_coherent_memory(rmem->base, rmem->base, rmem->size,
+ DMA_MEMORY_EXCLUSIVE, &mem);
+
+ if (ret) {
pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
&rmem->base, (unsigned long)rmem->size / SZ_1M);
- return -ENODEV;
+ return ret;
}
mem->use_dev_dma_pfn_offset = true;
rmem->priv = mem;
diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c
index b555ff9dd8fc..e584eddef0a7 100644
--- a/drivers/base/dma-mapping.c
+++ b/drivers/base/dma-mapping.c
@@ -176,13 +176,10 @@ int dmam_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
rc = dma_declare_coherent_memory(dev, phys_addr, device_addr, size,
flags);
- if (rc) {
+ if (!rc)
devres_add(dev, res);
- rc = 0;
- } else {
+ else
devres_free(res);
- rc = -ENOMEM;
- }
return rc;
}
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
index a5fb884a136d..4b57cf5bc81d 100644
--- a/drivers/base/firmware_class.c
+++ b/drivers/base/firmware_class.c
@@ -258,38 +258,6 @@ static int fw_cache_piggyback_on_request(const char *name);
* guarding for corner cases a global lock should be OK */
static DEFINE_MUTEX(fw_lock);
-static bool __enable_firmware = false;
-
-static void enable_firmware(void)
-{
- mutex_lock(&fw_lock);
- __enable_firmware = true;
- mutex_unlock(&fw_lock);
-}
-
-static void disable_firmware(void)
-{
- mutex_lock(&fw_lock);
- __enable_firmware = false;
- mutex_unlock(&fw_lock);
-}
-
-/*
- * When disabled only the built-in firmware and the firmware cache will be
- * used to look for firmware.
- */
-static bool firmware_enabled(void)
-{
- bool enabled = false;
-
- mutex_lock(&fw_lock);
- if (__enable_firmware)
- enabled = true;
- mutex_unlock(&fw_lock);
-
- return enabled;
-}
-
static struct firmware_cache fw_cache;
static struct firmware_buf *__allocate_fw_buf(const char *fw_name,
@@ -1246,12 +1214,6 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
if (ret <= 0) /* error or already assigned */
goto out;
- if (!firmware_enabled()) {
- WARN(1, "firmware request while host is not available\n");
- ret = -EHOSTDOWN;
- goto out;
- }
-
ret = fw_get_filesystem_firmware(device, fw->priv);
if (ret) {
if (!(opt_flags & FW_OPT_NO_WARN))
@@ -1762,62 +1724,6 @@ static void device_uncache_fw_images_delay(unsigned long delay)
msecs_to_jiffies(delay));
}
-/**
- * fw_pm_notify - notifier for suspend/resume
- * @notify_block: unused
- * @mode: mode we are switching to
- * @unused: unused
- *
- * Used to modify the firmware_class state as we move in between states.
- * The firmware_class implements a firmware cache to enable device driver
- * to fetch firmware upon resume before the root filesystem is ready. We
- * disable API calls which do not use the built-in firmware or the firmware
- * cache when we know these calls will not work.
- *
- * The inner logic behind all this is a bit complex so it is worth summarizing
- * the kernel's own suspend/resume process with context and focus on how this
- * can impact the firmware API.
- *
- * First a review on how we go to suspend::
- *
- * pm_suspend() --> enter_state() -->
- * sys_sync()
- * suspend_prepare() -->
- * __pm_notifier_call_chain(PM_SUSPEND_PREPARE, ...);
- * suspend_freeze_processes() -->
- * freeze_processes() -->
- * __usermodehelper_set_disable_depth(UMH_DISABLED);
- * freeze all tasks ...
- * freeze_kernel_threads()
- * suspend_devices_and_enter() -->
- * dpm_suspend_start() -->
- * dpm_prepare()
- * dpm_suspend()
- * suspend_enter() -->
- * platform_suspend_prepare()
- * dpm_suspend_late()
- * freeze_enter()
- * syscore_suspend()
- *
- * When we resume we bail out of a loop from suspend_devices_and_enter() and
- * unwind back out to the caller enter_state() where we were before as follows::
- *
- * enter_state() -->
- * suspend_devices_and_enter() --> (bail from loop)
- * dpm_resume_end() -->
- * dpm_resume()
- * dpm_complete()
- * suspend_finish() -->
- * suspend_thaw_processes() -->
- * thaw_processes() -->
- * __usermodehelper_set_disable_depth(UMH_FREEZING);
- * thaw_workqueues();
- * thaw all processes ...
- * usermodehelper_enable();
- * pm_notifier_call_chain(PM_POST_SUSPEND);
- *
- * fw_pm_notify() works through pm_notifier_call_chain().
- */
static int fw_pm_notify(struct notifier_block *notify_block,
unsigned long mode, void *unused)
{
@@ -1831,7 +1737,6 @@ static int fw_pm_notify(struct notifier_block *notify_block,
*/
kill_pending_fw_fallback_reqs(true);
device_cache_fw_images();
- disable_firmware();
break;
case PM_POST_SUSPEND:
@@ -1844,7 +1749,6 @@ static int fw_pm_notify(struct notifier_block *notify_block,
mutex_lock(&fw_lock);
fw_cache.state = FW_LOADER_NO_CACHE;
mutex_unlock(&fw_lock);
- enable_firmware();
device_uncache_fw_images_delay(10 * MSEC_PER_SEC);
break;
@@ -1893,7 +1797,6 @@ static void __init fw_cache_init(void)
static int fw_shutdown_notify(struct notifier_block *unused1,
unsigned long unused2, void *unused3)
{
- disable_firmware();
/*
* Kill all pending fallback requests to avoid both stalling shutdown,
* and avoid a deadlock with the usermode_lock.
@@ -1909,7 +1812,6 @@ static struct notifier_block fw_shutdown_nb = {
static int __init firmware_class_init(void)
{
- enable_firmware();
fw_cache_init();
register_reboot_notifier(&fw_shutdown_nb);
#ifdef CONFIG_FW_LOADER_USER_HELPER
@@ -1921,7 +1823,6 @@ static int __init firmware_class_init(void)
static void __exit firmware_class_exit(void)
{
- disable_firmware();
#ifdef CONFIG_PM_SLEEP
unregister_syscore_ops(&fw_syscore_ops);
unregister_pm_notifier(&fw_cache.pm_notify);
generated by cgit (git 2.34.1) at 2024-05-24 18:51:46 +0000