From: Alex Deucher <alexdeucher@gmail.com>
To: Bernard Zhao <bernard@vivo.com>
Cc: "Alex Sierra" <alex.sierra@amd.com>,
"Oak Zeng" <Oak.Zeng@amd.com>,
"Maling list - DRI developers" <dri-devel@lists.freedesktop.org>,
"David Airlie" <airlied@linux.ie>,
"Felix Kuehling" <Felix.Kuehling@amd.com>,
LKML <linux-kernel@vger.kernel.org>,
"amd-gfx list" <amd-gfx@lists.freedesktop.org>,
kernel@vivo.com, "Huang Rui" <ray.huang@amd.com>,
"Kent Russell" <kent.russell@amd.com>,
"Alex Deucher" <alexander.deucher@amd.com>,
"Sam Ravnborg" <sam@ravnborg.org>,
"Christian König" <christian.koenig@amd.com>,
"Xiaojie Yuan" <xiaojie.yuan@amd.com>
Subject: Re: [PATCH] Optimized division operation to shift operation
Date: Tue, 14 Apr 2020 14:15:03 -0400 [thread overview]
Message-ID: <CADnq5_Phca3L-HGOQz0DPBoARHgwcJRK_a7-WmeFMPkrPWeOeg@mail.gmail.com> (raw)
In-Reply-To: <1586864113-30682-1-git-send-email-bernard@vivo.com>
On Tue, Apr 14, 2020 at 9:05 AM Bernard Zhao <bernard@vivo.com> wrote:
>
> On some processors, the / operate will call the compiler`s div lib,
> which is low efficient, We can replace the / operation with shift,
> so that we can replace the call of the division library with one
> shift assembly instruction.
>
> Signed-off-by: Bernard Zhao <bernard@vivo.com>
Applied. thanks.
Alex
> ---
> drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c | 4 ++--
> drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c | 4 ++--
> drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c | 4 ++--
> 3 files changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
> index b205039..66cd078 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v6_0.c
> @@ -175,10 +175,10 @@ static int gmc_v6_0_mc_load_microcode(struct amdgpu_device *adev)
> amdgpu_ucode_print_mc_hdr(&hdr->header);
>
> adev->gmc.fw_version = le32_to_cpu(hdr->header.ucode_version);
> - regs_size = le32_to_cpu(hdr->io_debug_size_bytes) / (4 * 2);
> + regs_size = le32_to_cpu(hdr->io_debug_size_bytes) >> 3;
> new_io_mc_regs = (const __le32 *)
> (adev->gmc.fw->data + le32_to_cpu(hdr->io_debug_array_offset_bytes));
> - ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes) / 4;
> + ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes) >> 2;
> new_fw_data = (const __le32 *)
> (adev->gmc.fw->data + le32_to_cpu(hdr->header.ucode_array_offset_bytes));
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> index 9da9596..ca26d63 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v7_0.c
> @@ -193,10 +193,10 @@ static int gmc_v7_0_mc_load_microcode(struct amdgpu_device *adev)
> amdgpu_ucode_print_mc_hdr(&hdr->header);
>
> adev->gmc.fw_version = le32_to_cpu(hdr->header.ucode_version);
> - regs_size = le32_to_cpu(hdr->io_debug_size_bytes) / (4 * 2);
> + regs_size = le32_to_cpu(hdr->io_debug_size_bytes) >> 3;
> io_mc_regs = (const __le32 *)
> (adev->gmc.fw->data + le32_to_cpu(hdr->io_debug_array_offset_bytes));
> - ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes) / 4;
> + ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes) >> 2;
> fw_data = (const __le32 *)
> (adev->gmc.fw->data + le32_to_cpu(hdr->header.ucode_array_offset_bytes));
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> index 27d83204..295039c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c
> @@ -318,10 +318,10 @@ static int gmc_v8_0_tonga_mc_load_microcode(struct amdgpu_device *adev)
> amdgpu_ucode_print_mc_hdr(&hdr->header);
>
> adev->gmc.fw_version = le32_to_cpu(hdr->header.ucode_version);
> - regs_size = le32_to_cpu(hdr->io_debug_size_bytes) / (4 * 2);
> + regs_size = le32_to_cpu(hdr->io_debug_size_bytes) >> 3;
> io_mc_regs = (const __le32 *)
> (adev->gmc.fw->data + le32_to_cpu(hdr->io_debug_array_offset_bytes));
> - ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes) / 4;
> + ucode_size = le32_to_cpu(hdr->header.ucode_size_bytes) >> 2;
> fw_data = (const __le32 *)
> (adev->gmc.fw->data + le32_to_cpu(hdr->header.ucode_array_offset_bytes));
>
> --
> 2.7.4
>
> _______________________________________________
> amd-gfx mailing list
> amd-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/amd-gfx
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-04-14 18:15 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-14 11:35 [PATCH] Optimized division operation to shift operation Bernard Zhao
2020-04-14 18:15 ` Alex Deucher [this message]
2020-04-15 7:41 ` Jani Nikula
2020-04-15 7:57 ` Christian König
2020-04-15 9:16 ` Daniel Vetter
2020-04-15 9:39 ` David Laight
2020-04-15 14:08 ` Deucher, Alexander
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CADnq5_Phca3L-HGOQz0DPBoARHgwcJRK_a7-WmeFMPkrPWeOeg@mail.gmail.com \
--to=alexdeucher@gmail.com \
--cc=Felix.Kuehling@amd.com \
--cc=Oak.Zeng@amd.com \
--cc=airlied@linux.ie \
--cc=alex.sierra@amd.com \
--cc=alexander.deucher@amd.com \
--cc=amd-gfx@lists.freedesktop.org \
--cc=bernard@vivo.com \
--cc=christian.koenig@amd.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=kent.russell@amd.com \
--cc=kernel@vivo.com \
--cc=linux-kernel@vger.kernel.org \
--cc=ray.huang@amd.com \
--cc=sam@ravnborg.org \
--cc=xiaojie.yuan@amd.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).