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Message-ID: <hpqhbksvyfbqjumopk2k2drxri2ycb6j2dbdo74cfymcd7blgx@kzomazfosfwg>
Date: Tue, 19 Mar 2024 14:24:54 +0300
From: Ivan Bornyakov <brnkv.i1@...il.com>
To: Nas Chung <nas.chung@...psnmedia.com>
Cc: Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "jackson.lee" <jackson.lee@...psnmedia.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: Re: RE: [PATCH 5/6] media: chips-media: wave5: refine SRAM usage
Hello, Nas
On Tue, Mar 19, 2024 at 10:56:22AM +0000, Nas Chung wrote:
> Hi, Ivan.
>
> >-----Original Message-----
> >From: Ivan Bornyakov <brnkv.i1@...il.com>
> >Sent: Monday, March 18, 2024 11:42 PM
> >To: Nas Chung <nas.chung@...psnmedia.com>; jackson.lee
> ><jackson.lee@...psnmedia.com>; Mauro Carvalho Chehab <mchehab@...nel.org>
> >Cc: Ivan Bornyakov <brnkv.i1@...il.com>; Philipp Zabel
> ><p.zabel@...gutronix.de>; Rob Herring <robh@...nel.org>; Krzysztof
> >Kozlowski <krzysztof.kozlowski+dt@...aro.org>; Conor Dooley
> ><conor+dt@...nel.org>; linux-media@...r.kernel.org; linux-
> >kernel@...r.kernel.org; devicetree@...r.kernel.org
> >Subject: [PATCH 5/6] media: chips-media: wave5: refine SRAM usage
> >
> >Allocate SRAM memory on module probe, free on remove. There is no need
> >to allocate on device open, free on close, the memory is the same every
> >time.
>
> If there is no decoder/encoder instance, driver don't need to allocate SRAM memory.
> The main reason of allocating the memory in open() is to allow other modules to
> use more SRAM memory, if wave5 is not working.
>
> >
> >Also use gen_pool_size() to determine SRAM memory size to be allocated
> >instead of separate "sram-size" DT property to reduce duplication.
> >
> >Signed-off-by: Ivan Bornyakov <brnkv.i1@...il.com>
> >---
> > .../platform/chips-media/wave5/wave5-helper.c | 3 ---
> > .../platform/chips-media/wave5/wave5-vdi.c | 21 ++++++++++---------
> > .../chips-media/wave5/wave5-vpu-dec.c | 2 --
> > .../chips-media/wave5/wave5-vpu-enc.c | 2 --
> > .../platform/chips-media/wave5/wave5-vpu.c | 12 +++++------
> > .../platform/chips-media/wave5/wave5-vpuapi.h | 1 -
> > 6 files changed, 16 insertions(+), 25 deletions(-)
> >
> >diff --git a/drivers/media/platform/chips-media/wave5/wave5-helper.c
> >b/drivers/media/platform/chips-media/wave5/wave5-helper.c
> >index 8433ecab230c..ec710b838dfe 100644
> >--- a/drivers/media/platform/chips-media/wave5/wave5-helper.c
> >+++ b/drivers/media/platform/chips-media/wave5/wave5-helper.c
> >@@ -29,9 +29,6 @@ void wave5_cleanup_instance(struct vpu_instance *inst)
> > {
> > int i;
> >
> >- if (list_is_singular(&inst->list))
> >- wave5_vdi_free_sram(inst->dev);
> >-
> > for (i = 0; i < inst->fbc_buf_count; i++)
> > wave5_vpu_dec_reset_framebuffer(inst, i);
> >
> >diff --git a/drivers/media/platform/chips-media/wave5/wave5-vdi.c
> >b/drivers/media/platform/chips-media/wave5/wave5-vdi.c
> >index 3809f70bc0b4..ee671f5a2f37 100644
> >--- a/drivers/media/platform/chips-media/wave5/wave5-vdi.c
> >+++ b/drivers/media/platform/chips-media/wave5/wave5-vdi.c
> >@@ -174,16 +174,19 @@ int wave5_vdi_allocate_array(struct vpu_device
> >*vpu_dev, struct vpu_buf *array,
> > void wave5_vdi_allocate_sram(struct vpu_device *vpu_dev)
> > {
> > struct vpu_buf *vb = &vpu_dev->sram_buf;
> >+ dma_addr_t daddr;
> >+ void *vaddr;
> >+ size_t size;
> >
> >- if (!vpu_dev->sram_pool || !vpu_dev->sram_size)
> >+ if (!vpu_dev->sram_pool || vb->vaddr)
> > return;
> >
> >- if (!vb->vaddr) {
> >- vb->size = vpu_dev->sram_size;
> >- vb->vaddr = gen_pool_dma_alloc(vpu_dev->sram_pool, vb->size,
> >- &vb->daddr);
> >- if (!vb->vaddr)
> >- vb->size = 0;
> >+ size = gen_pool_size(vpu_dev->sram_pool);
> >+ vaddr = gen_pool_dma_alloc(vpu_dev->sram_pool, size, &daddr);
> >+ if (vaddr) {
> >+ vb->vaddr = vaddr;
> >+ vb->daddr = daddr;
> >+ vb->size = size;
> > }
> >
> > dev_dbg(vpu_dev->dev, "%s: sram daddr: %pad, size: %zu, vaddr:
> >0x%p\n",
> >@@ -197,9 +200,7 @@ void wave5_vdi_free_sram(struct vpu_device *vpu_dev)
> > if (!vb->size || !vb->vaddr)
> > return;
> >
> >- if (vb->vaddr)
> >- gen_pool_free(vpu_dev->sram_pool, (unsigned long)vb->vaddr,
> >- vb->size);
> >+ gen_pool_free(vpu_dev->sram_pool, (unsigned long)vb->vaddr, vb-
> >>size);
> >
> > memset(vb, 0, sizeof(*vb));
> > }
> >diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
> >b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
> >index aa0401f35d32..84dbe56216ad 100644
> >--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
> >+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
> >@@ -1854,8 +1854,6 @@ static int wave5_vpu_open_dec(struct file *filp)
> > goto cleanup_inst;
> > }
> >
> >- wave5_vdi_allocate_sram(inst->dev);
> >-
> > return 0;
> >
> > cleanup_inst:
> >diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> >b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> >index 8bbf9d10b467..86ddcb82443b 100644
> >--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> >+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-enc.c
> >@@ -1727,8 +1727,6 @@ static int wave5_vpu_open_enc(struct file *filp)
> > goto cleanup_inst;
> > }
> >
> >- wave5_vdi_allocate_sram(inst->dev);
> >-
> > return 0;
> >
> > cleanup_inst:
> >diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu.c
> >b/drivers/media/platform/chips-media/wave5/wave5-vpu.c
> >index f3ecadefd37a..2a0a70dd7062 100644
> >--- a/drivers/media/platform/chips-media/wave5/wave5-vpu.c
> >+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu.c
> >@@ -178,16 +178,11 @@ static int wave5_vpu_probe(struct platform_device
> >*pdev)
> > return ret;
> > }
> >
> >- ret = of_property_read_u32(pdev->dev.of_node, "sram-size",
> >- &dev->sram_size);
> >- if (ret) {
> >- dev_warn(&pdev->dev, "sram-size not found\n");
> >- dev->sram_size = 0;
> >- }
> >-
>
> Required SRAM size is different from each wave5 product.
> And, SoC vendor also can configure the different SRAM size
> depend on target SoC specification even they use the same wave5 product.
>
One can limit iomem address range in SRAM node. Here is the example of
how I setup Wave515 with SRAM:
sram@...0000 {
compatible = "mmio-sram";
reg = <0x0 0x2000000 0x0 0x80000>;
#address-cells = <1>;
#size-cells = <1>;
ranges = <0x0 0x0 0x2000000 0x80000>;
wave515_vpu_sram: wave515-vpu-sram@0 {
reg = <0x0 0x80000>;
pool;
};
};
wave515@...000 {
compatible = "cnm,wave515";
reg = <0x0 0x410000 0x0 0x10000>;
clocks = <&clk_ref1>;
clock-names = "videc";
interrupt-parent = <&wave515_intc>;
interrupts = <16 IRQ_TYPE_LEVEL_HIGH>;
resets = <&wave515_reset 0>,
<&wave515_reset 4>,
<&wave515_reset 8>,
<&wave515_reset 12>;
sram = <&wave515_vpu_sram>;
};
gen_pool_size() returns size of wave515_vpu_sram, no need for extra
"sram-size" property.
> Thanks.
> Nas.
>
> > dev->sram_pool = of_gen_pool_get(pdev->dev.of_node, "sram", 0);
> > if (!dev->sram_pool)
> > dev_warn(&pdev->dev, "sram node not found\n");
> >+ else
> >+ wave5_vdi_allocate_sram(dev);
> >
> > dev->product_code = wave5_vdi_read_register(dev,
> >VPU_PRODUCT_CODE_REGISTER);
> > ret = wave5_vdi_init(&pdev->dev);
> >@@ -259,6 +254,8 @@ static int wave5_vpu_probe(struct platform_device
> >*pdev)
> > err_clk_dis:
> > clk_bulk_disable_unprepare(dev->num_clks, dev->clks);
> >
> >+ wave5_vdi_free_sram(dev);
> >+
> > return ret;
> > }
> >
> >@@ -275,6 +272,7 @@ static void wave5_vpu_remove(struct platform_device
> >*pdev)
> > v4l2_device_unregister(&dev->v4l2_dev);
> > wave5_vdi_release(&pdev->dev);
> > ida_destroy(&dev->inst_ida);
> >+ wave5_vdi_free_sram(dev);
> > }
> >
> > static const struct wave5_match_data ti_wave521c_data = {
> >diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> >b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> >index fa62a85080b5..8d88381ac55e 100644
> >--- a/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> >+++ b/drivers/media/platform/chips-media/wave5/wave5-vpuapi.h
> >@@ -749,7 +749,6 @@ struct vpu_device {
> > struct vpu_attr attr;
> > struct vpu_buf common_mem;
> > u32 last_performance_cycles;
> >- u32 sram_size;
> > struct gen_pool *sram_pool;
> > struct vpu_buf sram_buf;
> > void __iomem *vdb_register;
> >--
> >2.44.0
>
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