From: Michael Kelley <mikelley@microsoft.com>
To: Wei Hu <weh@microsoft.com>,
"b.zolnierkie@samsung.com" <b.zolnierkie@samsung.com>,
KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
"sashal@kernel.org" <sashal@kernel.org>,
"hch@lst.de" <hch@lst.de>,
"m.szyprowski@samsung.com" <m.szyprowski@samsung.com>,
"mchehab+samsung@kernel.org" <mchehab+samsung@kernel.org>,
"sam@ravnborg.org" <sam@ravnborg.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
"info@metux.net" <info@metux.net>,
"arnd@arndb.de" <arnd@arndb.de>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>,
"linux-fbdev@vger.kernel.org" <linux-fbdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
Dexuan Cui <decui@microsoft.com>
Cc: kbuild test robot <lkp@intel.com>
Subject: RE: [PATCH v4] video: hyperv: hyperv_fb: Use physical memory for fb on HyperV Gen 1 VMs.
Date: Mon, 9 Dec 2019 16:32:56 +0000 [thread overview]
Message-ID: <CY4PR21MB06293C21EC5338C98080F6AED7580@CY4PR21MB0629.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20191209075749.3804-1-weh@microsoft.com>
From: Wei Hu <weh@microsoft.com> Sent: Sunday, December 8, 2019 11:58 PM
>
> On Hyper-V, Generation 1 VMs can directly use VM's physical memory for
> their framebuffers. This can improve the efficiency of framebuffer and
> overall performence for VM. The physical memory assigned to framebuffer
> must be contiguous. We use CMA allocator to get contiguouse physicial
> memory when the framebuffer size is greater than 4MB. For size under
> 4MB, we use alloc_pages to achieve this.
>
> To enable framebuffer memory allocation from CMA, supply a kernel
> parameter to give enough space to CMA allocator at boot time. For
> example:
> cma=130m
> This gives 130MB memory to CAM allocator that can be allocated to
> framebuffer. If this fails, we fall back to the old way of using
> mmio for framebuffer.
>
> Reported-by: kbuild test robot <lkp@intel.com>
> Signed-off-by: Wei Hu <weh@microsoft.com>
> ---
> v2: Incorporated review comments form hch@lst.de, Michael Kelley and
> Dexuan Cui
> - Use dma_alloc_coherent to allocate large contiguous memory
> - Use phys_addr_t for physical addresses
> - Corrected a few spelling errors and minor cleanups
> - Also tested on 32 bit Ubuntu guest
> v3: Fixed a build issue reported by kbuild test robot and incorported
> some review comments from Michael Kelley
> - Add CMA check to avoid link failure
> - Fixed small memory leak introduced by alloc_apertures
> - Cleaned up so code
> v4: Removed request_pages variable as it is no longer needed
>
> drivers/video/fbdev/Kconfig | 1 +
> drivers/video/fbdev/hyperv_fb.c | 182 +++++++++++++++++++++++++-------
> 2 files changed, 144 insertions(+), 39 deletions(-)
>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
next prev parent reply other threads:[~2019-12-09 16:33 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-09 7:57 [PATCH v4] video: hyperv: hyperv_fb: Use physical memory for fb on HyperV Gen 1 VMs Wei Hu
2019-12-09 16:32 ` Michael Kelley [this message]
2020-01-06 22:37 ` Dexuan Cui
2020-01-15 15:16 ` Bartlomiej Zolnierkiewicz
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