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Re: [Qemu-devel] [PATCH v3 1/4] firmware: introduce sysfs driver for QEM
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH v3 1/4] firmware: introduce sysfs driver for QEMU's fw_cfg device |
Date: |
Tue, 6 Oct 2015 09:40:42 +0100 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Sat, Oct 03, 2015 at 07:28:06PM -0400, Gabriel L. Somlo wrote:
> +/* read chunk of given fw_cfg blob (caller responsible for sanity-check) */
> +static inline void fw_cfg_read_blob(u16 key,
> + void *buf, loff_t pos, size_t count)
> +{
> + mutex_lock(&fw_cfg_dev_lock);
> + iowrite16(fw_cfg_sel_endianness(key), fw_cfg_reg_ctrl);
> + while (pos-- > 0)
> + ioread8(fw_cfg_reg_data);
> + ioread8_rep(fw_cfg_reg_data, buf, count);
> + mutex_unlock(&fw_cfg_dev_lock);
> +}
Have you had a chance to play with Marc Mari's fw_cfg DMA interface
patches? They should make this operation much faster.
https://www.mail-archive.com/address@hidden/msg325541.html
Stefan