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From: Takashi Iwai <>
Subject: [alsa-devel] [PATCH 1/4] ALSA: memalloc: Allow NULL device for SNDRV_DMA_TYPE_CONTINOUS type
Date: Tue,  5 Nov 2019 09:01:35 +0100
Message-ID: <> (raw)
In-Reply-To: <>

Currently we pass the artificial device pointer to the allocation
helper in the case of SNDRV_DMA_TYPE_CONTINUOUS for passing the GFP
flags.  But all common cases are the allocations with GFP_KERNEL, and
it's messy to put this in each place.

In this patch, the memalloc core helper is changed to accept the NULL
device pointer and it treats as the default mode, GFP_KERNEL, so that
all callers can omit the complex argument but just leave NULL.

Signed-off-by: Takashi Iwai <>
 Documentation/sound/kernel-api/writing-an-alsa-driver.rst | 14 ++++++++------
 sound/core/memalloc.c                                     |  9 ++++++++-
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst
index 132f5eb9b530..5385618fd881 100644
--- a/Documentation/sound/kernel-api/writing-an-alsa-driver.rst
+++ b/Documentation/sound/kernel-api/writing-an-alsa-driver.rst
@@ -3523,12 +3523,14 @@ The second argument (type) and the third argument (device pointer) are
 dependent on the bus. For normal devices, pass the device pointer
 (typically identical as ``card->dev``) to the third argument with
 ``SNDRV_DMA_TYPE_DEV`` type. For the continuous buffer unrelated to the
-bus can be pre-allocated with ``SNDRV_DMA_TYPE_CONTINUOUS`` type and the
-``snd_dma_continuous_data(GFP_KERNEL)`` device pointer, where
-``GFP_KERNEL`` is the kernel allocation flag to use. For the
-scatter-gather buffers, use ``SNDRV_DMA_TYPE_DEV_SG`` with the device
-pointer (see the `Non-Contiguous Buffers`_
+bus can be pre-allocated with ``SNDRV_DMA_TYPE_CONTINUOUS`` type.
+You can pass NULL to the device pointer in that case, which is the
+default mode implying to allocate with ``GFP_KRENEL`` flag.
+If you need a different GFP flag, you can pass it by encoding the flag
+into the device pointer via a special macro
+For the scatter-gather buffers, use ``SNDRV_DMA_TYPE_DEV_SG`` with the
+device pointer (see the `Non-Contiguous Buffers`_ section).
 Once the buffer is pre-allocated, you can use the allocator in the
 ``hw_params`` callback:
diff --git a/sound/core/memalloc.c b/sound/core/memalloc.c
index 6850d13aa98c..e56f84fbd659 100644
--- a/sound/core/memalloc.c
+++ b/sound/core/memalloc.c
@@ -99,6 +99,13 @@ static void snd_free_dev_iram(struct snd_dma_buffer *dmab)
+static inline gfp_t snd_mem_get_gfp_flags(const struct device *dev)
+	if (!dev)
+		return GFP_KRENEL;
+	else
+		return (__force gfp_t)(unsigned long)dev;
  * snd_dma_alloc_pages - allocate the buffer area according to the given type
@@ -129,7 +136,7 @@ int snd_dma_alloc_pages(int type, struct device *device, size_t size,
 	switch (type) {
 		dmab->area = alloc_pages_exact(size,
-					       (__force gfp_t)(unsigned long)device);
+					       snd_mem_get_gfp_flags(device));
 		dmab->addr = 0;

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Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-05  8:01 [alsa-devel] [PATCH 0/4] ALSA: enhancement / cleanup on memalloc stuff Takashi Iwai
2019-11-05  8:01 ` Takashi Iwai [this message]
2019-11-05 17:58   ` [alsa-devel] [PATCH 1/4] ALSA: memalloc: Allow NULL device for SNDRV_DMA_TYPE_CONTINOUS type Ranjani Sridharan
2019-11-05 18:10     ` Takashi Iwai
2019-11-05 18:17       ` Sridharan, Ranjani
2019-11-05 18:46         ` Takashi Iwai
2019-11-05 18:28   ` Amadeusz Sławiński
2019-11-05 18:47     ` Takashi Iwai
2019-11-06 14:59   ` [alsa-devel] [PATCH v2] ALSA: memalloc: Allow NULL device for SNDRV_DMA_TYPE_CONTINUOUS type Takashi Iwai
2019-11-05  8:01 ` [alsa-devel] [PATCH 2/4] ALSA: memalloc: Add vmalloc buffer allocation support Takashi Iwai
2019-11-05  8:01 ` [alsa-devel] [PATCH 3/4] ALSA: pcm: Handle special page mapping in the default mmap handler Takashi Iwai
2019-11-05  8:01 ` [alsa-devel] [PATCH 4/4] ALSA: docs: Update documentation about SG- and vmalloc-buffers Takashi Iwai

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